{ "date": "2026-11-05", "seed": 20261105, "bootstrap_resamples": 10000, "bootstrap": "Sampled article tasks resampled as clusters; original inverse-inclusion weights kept fixed; percentile intervals.", "sample_sha256": "2c2c1cf5fc1c820c4cdbf9b5c7d27ed1b2dbb53f8dd602899b1acfea44c8f18e", "reference_sample_sha256": "05f6a81400aae45ad2c5bc8b9b5f25a669c3bb032701a630fa315ce553ca69eb", "scores_sha256": "dda536fa0735f545e8791dec9ed0b0fa70dfa922870595a9d8c5cf6ccf22a5e4", "population_stratum_sizes": { "unanimous_3": 83, "unanimous_0": 765, "split_2_1": 36, "split_1_2": 56, "selected": 60 }, "stratum_sample_sizes": { "selected": 30, "split_2_1": 20, "split_1_2": 20, "unanimous_3": 15, "unanimous_0": 15 }, "sample": { "n": 100, "tasks": 44, "human_score_counts": { "0": 1, "1": 14, "2": 35, "3": 36, "4": 14 }, "judge_median_counts": { "0": 1, "1": 6, "2": 38, "3": 45, "4": 10 }, "exact_score_agreement": 0.62, "within_one_score_agreement": 0.99, "mean_human_minus_judge": -0.09, "primary": { 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0.836943776002896 ], "weighted_agreement": [ 0.7705742222746588, 0.9695216492761234 ], "weighted_kappa": [ 0.36522525753117396, 0.8699617577875283 ], "selected_human": [ 0.4166666666666667, 0.8181818181818182 ], "selected_judge": [ 0.5, 0.8214285714285714 ], "selected_delta": [ -0.19047619047619047, 0.1071428571428572 ] }, "source_audit_sha256": "83a37ffe370ed46abc1f9bc6c3ffe6e876c4cc39f369547d71ee7bbbb06813de", "references": { "n": 20, "score_counts": { "1": 1, "2": 11, "3": 8 }, "central_finding_correct": 19, "all_key_points_accurate": 8, "source_availability_reported_by_author": { "full_text": 16, "abstract_only": 4 }, "individual_source_availability": "Author identified abstract-only cards 1, 4, 11 and 20; the other 16 were checked against full texts.", "by_source_basis": { "full_text": { "n": 16, "score_counts": { "1": 1, "2": 11, "3": 4 }, "central_finding_correct": 15, "all_key_points_accurate": 4 }, "abstract": { "n": 4, "score_counts": { "3": 4 }, "central_finding_correct": 4, "all_key_points_accurate": 4 } }, "score_3_interpretation": "Accurate against the source reviewed: four full texts and four abstracts.", "author_source_audit": { "date": "2026-11-05", "reported_by": "author", "abstract_only_tasks": [ "R42601407", "R42821663", "R42759510", "R42822442" ], "abstract_only_cards": [ 1, 4, 11, 20 ], "abstract_only_note": "We checked four references against abstracts only: cards No. 1 (R42601407, Nat Aging), No. 4 (R42821663, Science), No. 11 (R42759510, Neuron) and No. 20 (R42822442, Immunity), whose full texts are absent from PMC and require a subscription at the publisher. No discrepancies with the abstracts were identified, so all four received a score of 3; however, this check establishes only that the text from which the reference was compiled was not distorted.", "reference_audits": { "R42844664": { "card": 9, "pmid": "42844664", "doi": "10.1111/acel.70728", "score": 1, "source_basis": "full_text", "source_url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC13646369/", "reason": "A score of 1 was assigned to card No. 9 (R42844664, Aging Cell), where the reference presents the sequence “acetate — GPR43 — HDAC3 inhibition — H4K8 acetylation — suppression of NLRP3-dependent pyroptosis” as an established mechanism. For GPR43 and HDAC3, the study reports expression levels only (Figs. 6O and S14), whereas the authors performed no loss-of-function experiments, such as knockout, a receptor antagonist or an enzyme inhibitor, and the direction of the acetate-associated change in HDAC3 in HUVEC experiments is opposite in two places in the article (Fig. S11). The link between H4K8 acetylation and NLRP3 remains correlational because chromatin immunoprecipitation at the NLRP3 promoter was not performed; the authors acknowledge the need for this experiment in the discussion.\n\nThe authors support the description “necessary and sufficient” for the microbiota as a whole: antibiotic treatment abolishes protection, and faecal microbiota transfer reproduces it. For acetate, only sufficiency is demonstrated (sodium acetate gavage, Figs. 6A–P), since neither acetate blockade nor an acetate-deficient donor was used. Butyric, valeric and isobutyric acids also increased significantly alongside acetate, so the data do not uniquely determine the choice of acetate. The between-group difference in Limosilactobacillus is significant only in metagenomics and not in 16S data (Fig. S13), and it was not administered to animals as a probiotic; therefore, “acetate-producing Limosilactobacillus” should be treated as the authors’ interpretation.\n\nThus, key point d and half of key point e lack causal confirmation, which determined the score.", "evidence": [ { "claim": "Microbiota-dependent protection", "observation": "Antibiotic treatment removes protection and faecal microbiota transfer reproduces it; these interventions concern the microbiota as a whole." }, { "claim": "Acetate sufficiency", "observation": "Sodium acetate gavage improves cardiovascular phenotypes and restores protection after microbiota depletion.", "figure": "6A-P" }, { "claim": "Acetate necessity", "observation": "The author distinguishes the acetate supplementation result from a selective loss-of-function test of acetate; necessity is overstated in the reference." }, { "claim": "GPR43 activation and HDAC3 inhibition", "observation": "The readouts are expression levels; these establish expression changes rather than receptor activation or enzyme activity.", "figures": [ "6O", "S14" ] }, { "claim": "HDAC3 direction in endothelial cells", "observation": "The HUVEC narrative gives opposite directions for the acetate-associated change in HDAC3 expression.", "section": "3.10", "figure": "S11" }, { "claim": "H4K8ac to NLRP3", "observation": "The evidence is associative; the discussion describes the precise epigenetic link as requiring clarification.", "section": "4" }, { "claim": "Specificity for acetate", "observation": "Butyric, valeric and isobutyric acid also increased among the eight measured short-chain fatty acids.", "figure": "5" }, { "claim": "Limosilactobacillus as the acetate-producing mediator", "observation": "The between-group association is significant in metagenomics; in 16S data it is not significant. The attribution to acetate production is an inference from abundance and metabolite associations.", "section": "3.9", "figure": "S13" } ], "rubric_basis": "Thus, key point d and half of key point e lack causal confirmation, which determined the score." } }, "approved_explanation_ru_sha256": "b608d7b605467676a7118a255f645d947f7592ca5b2412d65eb0f0c6485df1c7", "approved_explanation_en_sha256": "c033fe9d8b94dc4c6b8542c569aecd35f5c8e01b2348c6fb719d1938a65ce8c4", "approved_explanation_en": "We checked four references against abstracts only: cards No. 1 (R42601407, Nat Aging), No. 4 (R42821663, Science), No. 11 (R42759510, Neuron) and No. 20 (R42822442, Immunity), whose full texts are absent from PMC and require a subscription at the publisher. No discrepancies with the abstracts were identified, so all four received a score of 3; however, this check establishes only that the text from which the reference was compiled was not distorted.\n\nA score of 1 was assigned to card No. 9 (R42844664, Aging Cell), where the reference presents the sequence “acetate — GPR43 — HDAC3 inhibition — H4K8 acetylation — suppression of NLRP3-dependent pyroptosis” as an established mechanism. For GPR43 and HDAC3, the study reports expression levels only (Figs. 6O and S14), whereas the authors performed no loss-of-function experiments, such as knockout, a receptor antagonist or an enzyme inhibitor, and the direction of the acetate-associated change in HDAC3 in HUVEC experiments is opposite in two places in the article (Fig. S11). The link between H4K8 acetylation and NLRP3 remains correlational because chromatin immunoprecipitation at the NLRP3 promoter was not performed; the authors acknowledge the need for this experiment in the discussion.\n\nThe authors support the description “necessary and sufficient” for the microbiota as a whole: antibiotic treatment abolishes protection, and faecal microbiota transfer reproduces it. For acetate, only sufficiency is demonstrated (sodium acetate gavage, Figs. 6A–P), since neither acetate blockade nor an acetate-deficient donor was used. Butyric, valeric and isobutyric acids also increased significantly alongside acetate, so the data do not uniquely determine the choice of acetate. The between-group difference in Limosilactobacillus is significant only in metagenomics and not in 16S data (Fig. S13), and it was not administered to animals as a probiotic; therefore, “acetate-producing Limosilactobacillus” should be treated as the authors’ interpretation.\n\nThus, key point d and half of key point e lack causal confirmation, which determined the score." }, "flagged": [ { "task": "R42844664", "order": 9, "title": "Time-Restricted Feeding Delays Cardiovascular Aging by Increasing Acetic Acid Through Remodeling Gut Microbiota.", "doi": "10.1111/acel.70728", "score": 1 } ] }, "sensitivity_excluding_flagged_reference": { "grok-4.5": { "selected": 18, "judge_matches": 14 }, "gemini-4-argon-high": { "selected": 19, "judge_matches": 9 }, "claude-opus-5-5": { "selected": 21, "judge_matches": 13 }, "human_sample": { "n": 99, "tasks": 43, "human_score_counts": { "0": 1, "1": 14, "2": 34, "3": 36, "4": 14 }, "judge_median_counts": { "0": 1, "1": 6, "2": 38, "3": 44, "4": 10 }, "exact_score_agreement": 0.6262626262626263, "within_one_score_agreement": 0.98989898989899, "mean_human_minus_judge": -0.08080808080808081, "primary": { "confusion_human_rows_model_columns": [ [ 38.0, 11.0 ], [ 7.0, 43.0 ] ], "agreement": 0.8181818181818182, "kappa": 0.636029411764706, "human_match_rate": 0.5050505050505051, "judge_match_rate": 0.5454545454545454, "human_minus_judge_match_rate": -0.04040404040404033 }, "strict": { "confusion_human_rows_model_columns": [ [ 83.0, 2.0 ], [ 6.0, 8.0 ] ], "agreement": 0.9191919191919192, "kappa": 0.622137404580153, "human_match_rate": 0.1414141414141414, "judge_match_rate": 0.10101010101010101, "human_minus_judge_match_rate": 0.0404040404040404 } }, "selected_human_sample": { "n": 29, "tasks": 21, "human_score_counts": { "1": 5, "2": 5, "3": 8, "4": 11 }, "judge_median_counts": { "1": 2, "2": 8, "3": 11, "4": 8 }, "exact_score_agreement": 0.6206896551724138, "within_one_score_agreement": 0.9655172413793104, "mean_human_minus_judge": 0.0, "primary": { "confusion_human_rows_model_columns": [ [ 8.0, 2.0 ], [ 2.0, 17.0 ] ], "agreement": 0.8620689655172413, "kappa": 0.6947368421052631, "human_match_rate": 0.6551724137931034, "judge_match_rate": 0.6551724137931034, "human_minus_judge_match_rate": 0.0 }, "strict": { "confusion_human_rows_model_columns": [ [ 17.0, 1.0 ], [ 4.0, 7.0 ] ], "agreement": 0.8275862068965517, "kappa": 0.6133333333333333, "human_match_rate": 0.3793103448275862, "judge_match_rate": 0.27586206896551724, "human_minus_judge_match_rate": 0.10344827586206895 } } }, "hypotheses": [ { "item": "040c438793", "id": "grok-4.5|N|R42758848|3", "task": "R42758848", "generator": "grok-4.5", "background": "Ageing is accompanied by a progressive weakening of adaptive immune responses, which reduces protection against infections and cancer. Effective immunity requires resting immune cells to preserve metabolic competence while remaining ready for rapid activation. Age-related changes in chromatin regulation and cellular metabolism have both been implicated in immune dysfunction. However, the mechanism that establishes this latent metabolic readiness and how ageing disrupts it remained unclear.", "question": "What developmentally established epigenetic mechanism preserves metabolic readiness for rapid immune activation, and how is it disrupted during ageing?", "finding": "Tonic IL-7 signaling establishes a GABPα-dependent program that deposits H2A.Z at oxidative-phosphorylation gene promoters in quiescent naïve CD8+ T cells, priming their rapid metabolic and functional activation. Age-related loss of IL-7 signaling reduces H2A.Z occupancy and impairs activation, while IL-7 supplementation or enforced H2A.Z expression rescues the defect.", "key_points": [ "Ageing reduces tonic IL-7 signaling", "GABPα regulates H2A.Z deposition", "H2A.Z primes OXPHOS gene promoters", "Loss of this axis impairs naïve CD8+ T-cell activation", "IL-7 or H2A.Z restoration rescues the age-related defect" ], "hypothesis": "Developmentally timed deposition of histone variant H3.3 at metabolic gene bodies and promoters creates a labile nucleosome state that facilitates rapid Pol II recruitment upon immune activation. Ageing shifts turnover toward canonical H3, stabilizing chromatin and slowing metabolic gene induction. Mechanism: H3.3-enriched nucleosomes are more dynamic and permissive for rapid transcription; replacement by canonical H3 with age increases chromatin stability and raises the activation energy for metabolic gene expression. Prediction: H3.3 ChIP-seq occupancy at metabolic genes will decline with age while canonical H3 rises; H3.3 knockdown in young cells will phenocopy aged delayed metabolic activation, and H3.3 overexpression or chaperone (HIRA) restoration in aged cells will selectively accelerate induction of glycolytic/OXPHOS genes.", "position": 3, "stratum": "split_1_2", "selected": false, "human_score": 2, "judge_scores": [ 2, 2, 3 ], "judge_median": 2, "weight": 2.8 }, { "item": "09a1fb4ccf", "id": "grok-4.5|N|R42696595|0", "task": "R42696595", "generator": "grok-4.5", "background": "Seeds progressively lose viability during storage, limiting crop propagation and the preservation of genetic resources. Longevity varies substantially among rice varieties and is influenced by both environmental conditions and inherited traits. Although several genomic regions associated with seed longevity had been identified, the causal genes and regulatory mechanisms underlying this variation remained poorly understood. It was also unclear whether naturally occurring longevity alleles could improve seed survival without compromising agronomic performance.", "question": "What genetic and molecular mechanism causes natural variation in seed longevity among rice varieties?", "finding": "Natural variation at qSL6 causally determines rice seed longevity through SL6, a fatty acyl-ACP thioesterase that changes seed fatty-acid composition and increases resistance to oxidation. Desiccation-induced ABA signaling activates SL6 through VP1, while a virus-derived CT-rich element in the 5′ UTR of the ancestral SL6HHZ allele stabilizes its mRNA bidirectionally and contributes to longevity differences between indica and japonica rice.", "key_points": [ "qSL6 encodes the causal fatty acyl-ACP thioesterase SL6", "SL6 alters palmitic-acid synthesis and seed fatty-acid composition", "The ABA–VP1 module directly activates SL6 during seed desiccation", "A CT-rich 5′-UTR element stabilizes SL6HHZ mRNA", "Increasing SL6 expression improves seed longevity without major agronomic penalties" ], "hypothesis": "Natural allelic variation in a rice IAA-amido synthetase (OsGH3-family) gene alters free auxin homeostasis in developing seeds, changing seed-coat structure and thereby storage longevity. Accessions carrying a high-activity longevity allele conjugate more IAA, produce a less permeable coat, and retain higher germination after aging. Mechanism: Auxin conjugation reduces free IAA during late seed maturation, remodeling testa cell-wall and cuticle deposition and slowing oxidative aging. Prediction: Near-isogenic lines that differ only at the OsGH3 longevity QTL will show correlated differences in free IAA, seed-coat permeability (tetrazolium uptake), and post-aging germination; CRISPR knockout of the high-longevity allele will shorten longevity without changing primary yield components when auxin is restored chemically.", "position": 0, "stratum": "selected", "selected": true, "human_score": 1, "judge_scores": [ 1, 1, 1 ], "judge_median": 1, "weight": 2.0 }, { "item": "0d90ee9dfe", "id": "grok-4.5|N|R42663085|1", "task": "R42663085", "generator": "grok-4.5", "background": "Ageing commonly impairs the cyclical regeneration of hair follicles, contributing to progressive hair thinning and alopecia. Hair growth depends on the orderly transition of follicles from a resting phase into a proliferative growth phase. With age, this transition becomes less efficient as regenerative cells lose functional capacity. Whether this decline can be reversed by directly restoring an intrinsic molecular control of follicle regeneration remained unresolved.", "question": "Can an intrinsic molecular regulator be enhanced to reactivate quiescent hair follicles and restore hair regeneration, and through what mechanism?", "finding": "Increasing TPP1, either through stem-cell Acd overexpression or topical stabilization with the peptide TELODIN, accelerates hair regeneration in mice. TPP1 coordinates telomere capping and telomerase recruitment, activating bulge hair follicle stem cells and promoting their proliferation, differentiation, and migration as follicles transition synchronously from telogen to anagen.", "key_points": [ "TPP1 causally promotes hair regeneration", "TPP1 activates bulge hair follicle stem cells", "Telomere capping and telomerase recruitment mediate the effect", "Follicles transition from telogen to anagen", "Topical TELODIN stabilizes TPP1 and promotes hair growth" ], "hypothesis": "Reducing the activity of the quiescence-maintaining transcription factor Nfatc1 (or Foxc1) in aged follicle stem cells reactivates dormant follicles and restores hair regeneration. Persistent high Nfatc1 activity with age locks stem cells in a non-cycling state. Mechanism: Lowered Nfatc1 relieves transcriptional repression of cell-cycle and anagen-entry genes, allowing aged stem cells to exit prolonged telogen and re-enter the proliferative growth phase. Prediction: Conditional Nfatc1 knockdown or calcineurin pathway modulation in aged HFSCs will accelerate telogen-to-anagen transition and increase hair density, while ectopic Nfatc1 expression will prevent regeneration even when Wnt or growth-factor pathways are stimulated.", "position": 1, "stratum": "unanimous_0", "selected": false, "human_score": 1, "judge_scores": [ 2, 1, 2 ], "judge_median": 2, "weight": 51.0 }, { "item": "0efecb14dd", "id": "gemini-4-argon-high|N|R42647635|1", "task": "R42647635", "generator": "gemini-4-argon-high", "background": "Ageing is accompanied by progressive molecular damage, impaired tissue maintenance, and declining physiological function. Genetic studies in laboratory organisms have identified processes that can influence lifespan and cellular senescence. However, findings from small-animal models do not always translate directly to humans because of major differences in physiology, metabolism, and lifespan. A large-mammal model is therefore valuable for testing whether a proposed source of molecular damage can directly produce systemic ageing phenotypes.", "question": "Does experimentally increasing somatic mitochondrial DNA mutation burden cause premature ageing and shortened lifespan in a large mammal?", "finding": "Prime-edited pigs expressing proofreading-deficient POLG accumulated elevated somatic mitochondrial DNA mutations and developed systemic premature-ageing phenotypes. These included weight loss, rough hair, anaemia, tissue abnormalities, increased apoptosis, elevated senescence-associated markers, and shortened lifespan.", "key_points": [ "Proofreading-deficient POLG", "Increased somatic mitochondrial DNA mutations", "Systemic premature-ageing phenotypes", "Increased apoptosis and senescence markers", "Shortened lifespan" ], "hypothesis": "Elevating somatic mtDNA mutation burden in a large mammal causes premature ageing and shortened survival primarily by triggering chronic innate immune activation and systemic inflammaging rather than cell-autonomous ATP depletion. Sub-threshold mtDNA mutations induce proteotoxic stress that promotes mitochondrial membrane permeabilization and cytosolic nucleic acid sensing. Mechanism: Translation of mutated mtDNA produces misfolded oxidative phosphorylation subunits that overwhelm mitochondrial proteases and trigger the mitochondrial unfolded protein response (UPRmt), leading to outer membrane pore formation, efflux of oxidized or fragmented mtDNA into the cytosol, and constitutive activation of the cGAS-STING and NLRP3 inflammasome pathways, which drives paracrine cellular senescence across tissues. Prediction: Mutator large mammals will develop high circulating levels of type I interferons, IL-6, and SASP factors prior to overt bioenergetic decline, and pharmacological or genetic inhibition of STING or NLRP3 will significantly extend their healthspan and lifespan despite persistent mtDNA mutation loads and respiratory chain defects.", "position": 1, "stratum": "split_2_1", "selected": false, "human_score": 3, "judge_scores": [ 3, 3, 2 ], "judge_median": 3, "weight": 1.8 }, { "item": "15665083f5", "id": "gpt-6-astra|N|R42647635|2", "task": "R42647635", "generator": "gpt-6-astra", "background": "Ageing is accompanied by progressive molecular damage, impaired tissue maintenance, and declining physiological function. Genetic studies in laboratory organisms have identified processes that can influence lifespan and cellular senescence. However, findings from small-animal models do not always translate directly to humans because of major differences in physiology, metabolism, and lifespan. A large-mammal model is therefore valuable for testing whether a proposed source of molecular damage can directly produce systemic ageing phenotypes.", "question": "Does experimentally increasing somatic mitochondrial DNA mutation burden cause premature ageing and shortened lifespan in a large mammal?", "finding": "Prime-edited pigs expressing proofreading-deficient POLG accumulated elevated somatic mitochondrial DNA mutations and developed systemic premature-ageing phenotypes. These included weight loss, rough hair, anaemia, tissue abnormalities, increased apoptosis, elevated senescence-associated markers, and shortened lifespan.", "key_points": [ "Proofreading-deficient POLG", "Increased somatic mitochondrial DNA mutations", "Systemic premature-ageing phenotypes", "Increased apoptosis and senescence markers", "Shortened lifespan" ], "hypothesis": "Increasing somatic mitochondrial DNA mutations in adult stem and progenitor cells causes premature ageing and shortened lifespan by exhausting tissue regenerative capacity. Mechanism: Mitochondrial dysfunction induces progenitor apoptosis or durable proliferative arrest, reducing replacement of damaged cells and progressively impairing tissue maintenance. Prediction: Mutation elevation restricted to stem and progenitor cells produces greater regenerative failure than elevation in matched differentiated-cell compartments. Preserving low-mutation progenitors delays tissue decline despite persistent mutations in differentiated cells.", "position": 2, "stratum": "split_2_1", "selected": false, "human_score": 3, "judge_scores": [ 3, 2, 3 ], "judge_median": 3, "weight": 1.8 }, { "item": "159c06cc78", "id": "claude-opus-5-5|N|R42717261|0", "task": "R42717261", "generator": "claude-opus-5-5", "background": "Cellular senescence can develop in immune populations and alter tissue function through persistent inflammatory and dysfunctional states. Such immunosenescence has been associated with chronic inflammatory disorders, but whether senescent immune cells directly cause disease progression has remained uncertain. Metabolic disruption and mitochondrial damage are recognized triggers of senescence, including through the abnormal release of mitochondrial components into the cytosol. The causal sequence connecting these processes to intestinal inflammation and treatment resistance was unresolved.", "question": "What mechanism induces pathogenic immune-cell senescence in ulcerative colitis, and does this senescence causally exacerbate the disease?", "finding": "NAD+ metabolic dysregulation causes mitochondrial dysfunction and cytosolic mitochondrial DNA leakage, activating cGAS-STING signaling to drive CD8+ T-cell senescence. These senescent cells exacerbate colitis, while systemic senolytic treatment reduces disease severity; their associated signature also predicts severe disease and non-response to biologic therapy.", "key_points": [ "NAD+ metabolic dysregulation initiates the process", "Mitochondrial dysfunction causes cytosolic mitochondrial DNA leakage", "cGAS-STING activation drives CD8+ T-cell senescence", "Senescent CD8+ T cells causally exacerbate colitis", "Senolytic clearance attenuates disease severity" ], "hypothesis": "In ulcerative colitis, metabolic stress in mucosal T cells causes mitochondrial DNA to leak into the cytosol, activating the cGAS–STING pathway and driving these cells into a senescent, SASP-secreting state that worsens colitis. Blocking mtDNA release or STING signaling should prevent senescence and attenuate disease. Mechanism: Inflamed mucosal metabolic conditions damage mitochondria in lamina propria T cells; mitochondrial permeability transition/VDAC- or BAX/BAK-dependent pore formation releases mtDNA into the cytosol; cGAS detects it, STING–TBK1–IRF3/NF-κB signaling plus p53/p21 engagement enforces a stable cell-cycle arrest with a pro-inflammatory secretome (IL-6, IL-1β, TNF, chemokines) that recruits and activates neutrophils and macrophages, sustaining epithelial injury. Prediction: In colitis models, T-cell-specific deletion of Cgas or Sting1 (or mtDNA depletion/TFAM-dependent packaging rescue, or inhibition of the mPTP/VDAC oligomerization) reduces p16/p21-positive senescent mucosal T cells and SASP cytokines and lessens histological colitis, whereas deleting the same genes in epithelium or myeloid cells does not reproduce the senescence rescue; cytosolic mtDNA is measurable in sorted UC patient mucosal T cells and correlates with their senescence score.", "position": 0, "stratum": "selected", "selected": true, "human_score": 4, "judge_scores": [ 4, 4, 4 ], "judge_median": 4, "weight": 2.0 }, { "item": "17f5f37048", "id": "claude-opus-5-5|N|R42642518|4", "task": "R42642518", "generator": "claude-opus-5-5", "background": "Biological ageing progresses at different rates among individuals and is associated with broad changes in physiology and chronic-disease risk. Women and men can follow different ageing trajectories, particularly during midlife, but the biological basis and functional significance of these differences remain incompletely understood. Large clinical datasets can identify circulating features that change with age, although association alone cannot establish whether such features actively promote ageing. Experimental validation is therefore needed to distinguish causal contributors from passive biomarkers.", "question": "Which circulating factors that accumulate with age actively induce ageing-related cellular phenotypes, and is their resulting biological burden reversible?", "finding": "Age-associated accumulation of metabolic factors, including low-density lipoprotein, triglycerides, glucose and uric acid, and tumor markers, including carcinoembryonic antigen and human epididymis protein 4, induced senescence-related phenotypes in human endothelial cells. A high-fat-diet mouse model followed by dietary reversal further showed that ageing associated with metabolic burden is modifiable.", "key_points": [ "Specific metabolic and tumor markers accumulate with age", "The identified circulating factors induce senescence-related phenotypes", "Causality was tested in human endothelial cells", "Dietary reversal in mice supports modifiability of metabolic burden-induced ageing", "Ageing trajectories differ by sex during midlife" ], "hypothesis": "Circulating oxysterols, especially 7-ketocholesterol and 27-hydroxycholesterol generated by age-related oxidative and macrophage activity, causally induce endothelial and vascular smooth-muscle senescence and are the lipid arm of sex-divergent midlife ageing. Their action is receptor- and mitochondria-mediated rather than a byproduct of plaque burden, and lowering the oxysterol-to-cholesterol ratio should reverse the vascular senescence burden. Mechanism: 7-ketocholesterol inserts into membranes and triggers mitochondrial permeability transition, mtROS and NLRP3 inflammasome activation; 27-hydroxycholesterol acts as a selective oestrogen-receptor modulator and LXR ligand, antagonising ERα-dependent eNOS activity in women after oestrogen loss. Both converge on p53/p21-dependent endothelial senescence and SASP release. Prediction: Lowering circulating 27-hydroxycholesterol by CYP27A1 inhibition or raising CYP7B1 catabolism in old animals improves endothelium-dependent vasodilation and reduces aortic p21+ cells without changing total cholesterol, while matched total-cholesterol reduction alone does not — and infusing 7-ketocholesterol to old-plasma levels in young animals induces the same vascular senescence in the absence of hypercholesterolaemia.", "position": 4, "stratum": "split_1_2", "selected": false, "human_score": 2, "judge_scores": [ 3, 2, 2 ], "judge_median": 2, "weight": 2.8 }, { "item": "1bea06ab71", "id": "grok-4.5|N|R42723546|1", "task": "R42723546", "generator": "grok-4.5", "background": "Chronic ultraviolet exposure causes skin photoaging characterized by impaired barrier function, collagen loss, cellular senescence, and persistent inflammation. Damaged cells can accumulate dysfunctional organelles and release intracellular danger signals that sustain sterile inflammatory responses. Regenerative cell-free therapies have shown potential for repairing aged or injured tissues, but their activity can involve many distinct biological processes. The causal mechanism by which such therapies might suppress photoaging-associated senescence and inflammation remained unresolved.", "question": "Can a cell-free regenerative treatment alleviate UV-induced skin photoaging, and which causal intracellular mechanism mediates its protective effects?", "finding": "Human umbilical cord mesenchymal stem cell secretome protects against UV-induced photoaging by enhancing mitophagy, which clears damaged mitochondria and reduces cytosolic mitochondrial DNA leakage. This suppresses cGAS-STING signaling and downstream inflammatory cytokines; mitophagy inhibition abolishes protection, while STING inhibition restores it.", "key_points": [ "The secretome alleviates UV-induced photoaging and cellular senescence", "Enhanced mitophagy removes damaged mitochondria", "Reduced mitochondrial DNA leakage suppresses cGAS-STING signaling", "Mitophagy inhibition abolishes the protective effect", "STING inhibition rescues protection despite blocked mitophagy" ], "hypothesis": "The protective effect is caused by therapy-driven autophagic degradation of damaged lysosomes and aggregated proteins that otherwise sustain cGAS–STING and NF-κB signaling in photoaged epidermis. Mechanism: Upregulated macroautophagy and lysosomal biogenesis remove cytosolic DNA and protein aggregates that chronically activate innate immune sensors. Prediction: ATG5/ATG7 knockdown or chloroquine co-treatment will specifically abolish reductions in cGAMP, phospho-STING, and IL-6/IL-1β without equivalent loss of collagen synthesis rescue by alternative anabolic stimuli.", "position": 1, "stratum": "split_1_2", "selected": false, "human_score": 2, "judge_scores": [ 2, 3, 2 ], "judge_median": 2, "weight": 2.8 }, { "item": "1e06a11aac", "id": "claude-opus-5-5|N|R42669067|1", "task": "R42669067", "generator": "claude-opus-5-5", "background": "Cellular senescence is an irreversible growth-arrest state that contributes to ageing and age-related pathology. Senescent cells undergo changes in genome organization and can activate normally repressed repetitive DNA elements. Such activation may compromise genome stability and provoke inflammatory signaling. The regulatory mechanisms that preserve repeat silencing and thereby limit senescence remained incompletely understood.", "question": "How does SIRT1 regulate L1 retrotransposon activity, and does this regulation affect cellular senescence?", "finding": "SIRT1 suppresses L1 transcription and retrotransposition by promoting the association and recruitment of Lamin B1 and KAP1 at the L1 5′-UTR, increasing repressive H3K9me3 chromatin. SIRT1 deficiency derepresses L1, activates cGAS–STING signaling, and induces cellular senescence; reverse-transcriptase inhibition with 3TC rescues this phenotype.", "key_points": [ "SIRT1 represses L1 transcription and retrotransposition", "SIRT1 stabilizes Lamin B1–KAP1 interactions at the L1 5′-UTR", "The mechanism increases repressive H3K9me3 chromatin", "SIRT1 loss activates L1-dependent cGAS–STING signaling and senescence", "3TC rescues senescence caused by SIRT1 deficiency" ], "hypothesis": "SIRT1 silences L1 indirectly, by deacetylating and thereby activating the sequence-specific repressor machinery (TRIM28/KAP1–SETDB1, and the L1-targeting KRAB-ZFP ZNF93) rather than by acting at L1 DNA itself. SIRT1 decline inactivates this complex, releasing L1 and driving senescence. Mechanism: SIRT1 deacetylates TRIM28 (and/or SETDB1), a modification required for TRIM28 to scaffold SETDB1-mediated H3K9me3 at L1 loci. Hyperacetylated TRIM28 loses SETDB1 binding and HP1 recruitment, so H3K9me3 collapses specifically at KRAB-ZFP-bound young L1 subfamilies, de-repressing them. Prediction: SIRT1 loss increases TRIM28 acetylation and dissociates SETDB1 from TRIM28 by co-IP, with loss of H3K9me3 but no detectable SIRT1 at L1 DNA by ChIP; an acetyl-null TRIM28 mutant (K→R at the SIRT1 target site) restores L1 silencing and blocks senescence in SIRT1-depleted cells, whereas an acetyl-mimetic K→Q mutant phenocopies SIRT1 loss even when SIRT1 is intact.", "position": 1, "stratum": "split_2_1", "selected": false, "human_score": 3, "judge_scores": [ 3, 2, 3 ], "judge_median": 3, "weight": 1.8 }, { "item": "1e71303dba", "id": "grok-4.5|N|R42717261|0", "task": "R42717261", "generator": "grok-4.5", "background": "Cellular senescence can develop in immune populations and alter tissue function through persistent inflammatory and dysfunctional states. Such immunosenescence has been associated with chronic inflammatory disorders, but whether senescent immune cells directly cause disease progression has remained uncertain. Metabolic disruption and mitochondrial damage are recognized triggers of senescence, including through the abnormal release of mitochondrial components into the cytosol. The causal sequence connecting these processes to intestinal inflammation and treatment resistance was unresolved.", "question": "What mechanism induces pathogenic immune-cell senescence in ulcerative colitis, and does this senescence causally exacerbate the disease?", "finding": "NAD+ metabolic dysregulation causes mitochondrial dysfunction and cytosolic mitochondrial DNA leakage, activating cGAS-STING signaling to drive CD8+ T-cell senescence. These senescent cells exacerbate colitis, while systemic senolytic treatment reduces disease severity; their associated signature also predicts severe disease and non-response to biologic therapy.", "key_points": [ "NAD+ metabolic dysregulation initiates the process", "Mitochondrial dysfunction causes cytosolic mitochondrial DNA leakage", "cGAS-STING activation drives CD8+ T-cell senescence", "Senescent CD8+ T cells causally exacerbate colitis", "Senolytic clearance attenuates disease severity" ], "hypothesis": "In ulcerative colitis, chronic metabolic stress damages mitochondria in lamina propria T cells, releasing mtDNA into the cytosol; cytosolic mtDNA activates cGAS–STING, which drives a senescence program that produces a SASP that amplifies mucosal inflammation and impairs epithelial repair. Mechanism: Mitochondrial damage → cytosolic mtDNA → cGAS–STING → immune-cell senescence → SASP-driven colitis exacerbation Prediction: Selective blockade or genetic deletion of cGAS or STING in T cells will reduce senescence markers (p16, SA-β-gal), lower SASP cytokines in the mucosa, and improve histological colitis scores even when upstream mitochondrial stress persists; exogenous cytosolic mtDNA will recapitulate senescence and worsen disease in a STING-dependent manner.", "position": 0, "stratum": "selected", "selected": true, "human_score": 4, "judge_scores": [ 3, 4, 4 ], "judge_median": 4, "weight": 2.0 }, { "item": "2417e8c950", "id": "claude-opus-5-5|N|R42748238|0", "task": "R42748238", "generator": "claude-opus-5-5", "background": "Microvascular function declines with age, impairing tissue perfusion, nutrient delivery, and waste clearance. Vascular deterioration is associated with dysfunction across multiple organs and with increased frailty and mortality. Cellular senescence and altered metabolic homeostasis are recognized contributors to age-related tissue decline. However, the molecular mechanism by which vascular aging can drive organism-wide aging and shorten lifespan remained unclear.", "question": "What molecular mechanism causes age-related vascular deterioration to promote systemic senescence and shorten lifespan?", "finding": "Progressive activation of endothelial C/EBPβ induces AEP, which cleaves NAMPT and thereby causes systemic NAD+ depletion, vascular dysfunction, senescence, and reduced lifespan. Genetic disruption of AEP or expression of cleavage-resistant NAMPT N136A ameliorates these effects, while AEP inhibition or NMN supplementation alleviates age-related vascular decline.", "key_points": [ "Endothelial C/EBPβ activates AEP during aging", "AEP cleaves the NAD+ biosynthetic enzyme NAMPT", "NAMPT cleavage causes systemic NAD+ depletion and senescence", "The pathway drives vascular dysfunction and lifespan reduction", "Blocking AEP or preventing NAMPT cleavage rescues the phenotype" ], "hypothesis": "Aged endothelial cells lose a key metabolic enzyme that supplies a circulating NAD+ precursor to downstream tissues, so systemic NAD+ availability falls and senescence spreads organism-wide. Restoring the endothelial enzyme, or supplying the precursor, reverses systemic senescence and extends lifespan. Mechanism: Microvascular endothelium normally secretes an extracellular NAD+-biosynthetic enzyme (e.g., eNAMPT in extracellular vesicles) into plasma. Age-related endothelial dysfunction and capillary rarefaction reduce this secretion; parenchymal cells in muscle, brain, heart and kidney consequently cannot maintain NAD+ pools, sirtuin activity drops, mitochondrial and DNA-repair capacity fail, and cells enter a p16/p21 senescent state with SASP output that further damages the vasculature — a feed-forward loop. Prediction: Endothelial-specific knockout of the secreted enzyme in young mice lowers plasma precursor levels, drops NAD+ and raises senescence markers in distal non-vascular organs, and shortens lifespan; endothelial-specific overexpression (or precursor repletion) in aged mice restores distal-tissue NAD+, clears senescence and extends lifespan. Parenchymal-cell-specific knockout of the same enzyme does not reproduce the systemic phenotype, distinguishing a vascular-origin secreted factor from cell-autonomous metabolic decline.", "position": 0, "stratum": "selected", "selected": true, "human_score": 4, "judge_scores": [ 3, 3, 3 ], "judge_median": 3, "weight": 2.0 }, { "item": "25c810d3fd", "id": "grok-4.5|N|R42647119|0", "task": "R42647119", "generator": "grok-4.5", "background": "Cellular reprogramming offers a potential way to replace neurons lost through injury or neurodegenerative disease. Most regenerative strategies have been developed and validated in young experimental animals, although advanced age is the principal risk factor for many neurological disorders. Aging can alter both the plasticity of resident cells and the tissue response to injury. It was therefore unclear whether neuronal reprogramming would remain effective in aged neural tissue and which age-associated processes might limit it.", "question": "How does aging affect injury-induced neuronal reprogramming in the retina, and what mechanisms account for any age-related loss of regenerative capacity?", "finding": "Aging suppresses Müller glia-to-neuron reprogramming by preventing activation of progenitor programs while promoting reactive and inflammatory glial states and an exaggerated retinal neuroimmune response. Dexamethasone partially restores neurogenesis, confirming that age-associated inflammation is a causal, therapeutically tractable component of the regenerative defect, alongside glial-intrinsic barriers.", "key_points": [ "Aged Müller glia generate fewer neurons across three reprogramming strategies", "Aged glia fail to activate progenitor programs", "Reactive and inflammatory states increase with age", "The injured aged retina mounts an exaggerated neuroimmune response", "Dexamethasone partially rescues neurogenesis" ], "hypothesis": "Aging reduces injury-induced neuronal reprogramming in the retina because chronic low-grade inflammation progressively impairs Müller glial competence to activate neurogenic programs after injury. Suppressing age-associated inflammatory signaling in old retina should restore reprogramming efficiency toward youthful levels. Mechanism: Persistent innate immune activation (inflammaging) elevates NF-κB/STAT-driven glial reactivity that antagonizes Ascl1 and related neurogenic gene networks required for Müller glia-to-neuron conversion after injury. Prediction: Aged retinas will show higher baseline and post-injury inflammatory cytokine signatures coincident with fewer reprogrammed neurons; neutralizing key inflammatory mediators (e.g., IL-6/TNF or microglial depletion) will increase reprogrammed neuron yield in old but not young animals, whereas adding the same cytokines to young tissue will reduce yield.", "position": 0, "stratum": "selected", "selected": true, "human_score": 4, "judge_scores": [ 4, 4, 4 ], "judge_median": 4, "weight": 2.0 }, { "item": "28498a6bc1", "id": "gemini-4-argon-high|N|R42775698|4", "task": "R42775698", "generator": "gemini-4-argon-high", "background": "Intestinal structure and barrier integrity commonly deteriorate with age, contributing to altered nutrient handling, inflammation, and systemic metabolic dysfunction. Ageing is also accompanied by changes in circulating metabolites and intestinal gene expression. Observational studies have linked these features, but such associations cannot establish whether age-related changes in the intestinal ecosystem actively cause host dysfunction. The mechanisms connecting donor age-associated biological states to impaired intestinal physiology therefore remained unclear.", "question": "Can age-associated differences in the human gut microbial community causally reprogram intestinal barrier function, systemic metabolism, and mucosal gene expression, and what mediators contribute to these effects?", "finding": "Transplanting elderly-human gut microbiota into pigs caused reduced ileal villus height, loss of tight-junction proteins, altered plasma metabolites, and coordinated suppression of seven ileal mucosal antiviral-response hub genes compared with young-donor microbiota. The elderly-donor-associated metabolic shift was functionally linked to barrier impairment: Tyr-Phe increased epithelial electrical resistance, whereas prostaglandin E3 decreased it in IPEC-1 cells.", "key_points": [ "Elderly-donor microbiota causally impaired intestinal architecture and tight-junction integrity", "Elderly-donor transplantation reshaped the plasma metabolome", "Tyr-Phe strengthened and prostaglandin E3 weakened epithelial barrier function experimentally", "Seven mucosal hub genes were consistently downregulated after elderly-donor transplantation", "Blautia obeum enrichment was associated with the elderly-donor metabolic and barrier phenotype" ], "hypothesis": "A shift from saccharolytic to proteolytic fermentation coupled with reduced polyamine biosynthesis in the aged human gut microbiome generates circulating and luminal metabolites that directly impair epithelial autophagy, mitochondrial homeostasis, and host metabolic health. These donor-age-associated microbial metabolite profiles act as causal mediators sufficient to induce intestinal and systemic dysfunction even in the absence of live bacterial invasion. Mechanism: Elevated microbial production of proteolytic catabolites (such as p-cresol, indoxyl sulfate, and trimethylamine N-oxide) alongside depletion of microbial spermidine reduces eIF5A hypusination and autophagic flux in intestinal epithelial cells, inducing oxidative stress, villus and crypt structural atrophy, transcriptional reprogramming of metabolic pathways, and systemic insulin resistance. Prediction: Transfer of sterile fecal filtrates or circulating metabolite fractions derived from aged-microbiota recipients will partially recapitulate the mucosal transcriptional shifts and barrier defects seen with live fecal microbiota transplantation, and spermidine supplementation or dietary restriction of proteolytic substrates in colonized hosts will restore epithelial autophagy, intestinal morphology, and systemic metabolic function.", "position": 4, "stratum": "split_1_2", "selected": false, "human_score": 2, "judge_scores": [ 3, 2, 2 ], "judge_median": 2, "weight": 2.8 }, { "item": "297fbea2c8", "id": "gemini-4-argon-high|N|R42858183|0", "task": "R42858183", "generator": "gemini-4-argon-high", "background": "Aging is accompanied by declining lysosomal activity, impaired autophagic clearance, and loss of protein homeostasis. These changes contribute to progressive functional deterioration and increase vulnerability to protein-aggregation disorders. Restoring cellular clearance systems can sometimes improve lifespan or healthspan in model organisms. However, interventions that preserve lysosomal competence during aging and the mechanisms through which they act remain incompletely understood.", "question": "Can a defined intervention preserve lysosomal function and protein homeostasis during aging, thereby extending lifespan and maintaining organismal function, and through what mechanism?", "finding": "20(S)-ginsenoside Rg3 extended lifespan and preserved physiological and neuronal function in Caenorhabditis elegans by restoring lysosomal activity and autophagic flux. Rg3 remodeled neuronal lysosomal phosphoinositide signatures toward increased PI(4)P and reduced PI(3)P, suppressed RSKS-1/S6K–TORC1 signaling, and promoted nuclear HLH-30/TFEB activity, thereby improving proteostasis and resistance to polyglutamine- and α-synuclein-associated toxicity.", "key_points": [ "Rg3 extends lifespan and preserves healthspan", "Lysosomal function and autophagic flux are restored during aging", "Neuronal phosphoinositides shift toward higher PI(4)P and lower PI(3)P", "TORC1–RSKS-1/S6K signaling is suppressed and HLH-30/TFEB enters the nucleus", "Protein aggregation and neurodegeneration are reduced" ], "hypothesis": "Dietary supplementation with the polyamine spermidine preserves lysosomal proteolytic activity and maintains protein homeostasis during aging, thereby extending lifespan and organismal function, by sustaining the eIF5A-dependent translation of the master lysosomal transcription factor TFEB (HLH-30). Mechanism: Spermidine serves as the sole aminobutyl donor for the enzymatic hypusination of eukaryotic translation initiation factor 5A (eIF5A) via deoxyhypusine synthase (DHPS) and deoxyhypusine hydroxylase (DOHH). Hypusinated eIF5A resolves ribosome stalling at polyproline motifs within TFEB/HLH-30 mRNA, preventing age-related translational decline of TFEB and maintaining transcription of the Coordinated Lysosomal Expression and Regulation (CLEAR) network, including V-ATPase subunits and cathepsin hydrolases. Prediction: Spermidine treatment in aged organisms will restore nuclear TFEB/HLH-30 levels, lysosomal cathepsin activity, and clearance of insoluble ubiquitinated protein aggregates to extend lifespan, whereas pharmacological inhibition of DHPS (via GC7) or mutation of the eIF5A hypusination site (K50A) will completely abolish these benefits even when mTORC1 is pharmacologically inhibited to force nuclear translocation of existing TFEB.", "position": 0, "stratum": "selected", "selected": true, "human_score": 2, "judge_scores": [ 3, 2, 2 ], "judge_median": 2, "weight": 2.0 }, { "item": "2cfc672b0e", "id": "gemini-4-argon-high|N|R42775695|3", "task": "R42775695", "generator": "gemini-4-argon-high", "background": "Cardiac function progressively deteriorates with age, increasing susceptibility to heart failure and other cardiovascular disorders. Defective mitochondrial quality control is considered an important contributor to this decline. Selective removal of damaged mitochondria must remain properly balanced, because disruption at multiple stages of the process can impair cellular homeostasis. The upstream causes of this age-associated defect and whether it can be therapeutically reversed were not well established.", "question": "What causes defective mitochondrial quality-control flux in the aging heart, and how can restoring mitochondrial homeostasis reverse cardiac aging?", "finding": "Age-associated upregulation of HIF-3α drives excessive BNIP3 expression in senescent cardiomyocytes, causing mitophagy flux congestion and cardiac aging. Mitochondrial transplantation restores intracellular ATP homeostasis, restrains pathological HIF-3α–BNIP3 signaling, normalizes mitophagy flux, and rejuvenates the aging heart.", "key_points": [ "HIF-3α is aberrantly elevated with cardiac aging", "HIF-3α directly promotes excessive BNIP3 expression", "Overactive HIF-3α–BNIP3 signaling causes mitophagy flux congestion", "Mitochondrial transplantation restores ATP homeostasis and suppresses the axis", "Normalized mitophagy flux reverses age-related cardiac dysfunction" ], "hypothesis": "Pathological uncoupling between outer mitochondrial membrane receptor-mediated mitophagy (via FUNDC1 inactivation or maladaptive BNIP3/NIX activation) and AMPK-PGC-1alpha-driven mitochondrial biogenesis disrupts steady-state mitochondrial turnover in the aging heart. Co-targeting mitophagy receptor phosphorylation states alongside AMPK-PGC-1alpha activation re-balances the rates of organelle degradation and synthesis, reversing cardiac bioenergetic insufficiency. Mechanism: In aged cardiomyocytes, elevated CK2 and Src kinase activities phosphorylate FUNDC1 at Ser13 and Tyr18, sterically inhibiting its LC3-interacting region and suppressing basal receptor-mediated mitophagy, while chronic oxidative stress can trigger aberrant BNIP3/NIX dimerization and mitochondrial permeability transition pore opening. Because downstream AMPK-PGC-1alpha-NRF1/TFAM transcriptional signaling is concurrently depressed, the heart cannot coordinate degradative flux with de novo synthesis of respiratory complexes, leading to progressive attrition of functional mitochondrial mass. Prediction: Aged myocardium will display elevated phosphorylated (inactive) FUNDC1 alongside depressed PGC-1alpha/TFAM transcriptional output; uncompensated overexpression of BNIP3/NIX will cause mitochondrial depletion and heart failure, whereas combining FUNDC1 dephosphorylation (or Urolithin A treatment) with AMPK/PGC-1alpha activation will simultaneously increase mitophagic turnover and newly synthesized mtDNA copy number, restoring myocardial ATP/phosphocreatine ratios.", "position": 3, "stratum": "split_2_1", "selected": false, "human_score": 2, "judge_scores": [ 3, 3, 2 ], "judge_median": 3, "weight": 1.8 }, { "item": "32f7f5d47a", "id": "gemini-4-argon-high|N|R42805954|0", "task": "R42805954", "generator": "gemini-4-argon-high", "background": "Ageing is associated with declining thermogenic capacity in adipose tissue, impaired energy expenditure, and increased susceptibility to metabolic dysfunction. Subcutaneous white adipose tissue can acquire heat-producing adipocytes in response to environmental stimuli, but this capacity diminishes with age. Communication between the nervous system and adipose tissue helps regulate this adaptive response. The mechanisms responsible for its age-related deterioration remained incompletely understood.", "question": "What causal mechanism contributes to the age-related decline of thermogenic adipocytes in subcutaneous white adipose tissue?", "finding": "Microglial ALKBH5 suppresses Ntf5 expression by demethylating Ntf5 mRNA, thereby limiting activation of PVH TrkB-positive neurons, sympathetic innervation of subcutaneous white adipose tissue, and adipocyte browning. Microglia-specific ALKBH5 knockout preserved brown adipocytes and improved metabolic activity during ageing in male mice.", "key_points": [ "Microglial ALKBH5 restrains adipocyte browning", "ALKBH5 knockout increases Ntf5 mRNA m6A methylation and Ntf5 expression", "Ntf5 activates PVH TrkB-positive neurons and downstream sympathetic innervation", "Microglia-specific ALKBH5 loss prevents age-related brown adipocyte decline", "The causal findings were demonstrated in male mice" ], "hypothesis": "Age-related decline in subcutaneous white adipose tissue (scWAT) thermogenesis is driven by the loss of adipocyte- and stromal-derived neurotrophic factors (such as NGF, BDNF, and S100B) alongside increased repulsive axon guidance cues (such as SEMA3A), causing structural retraction of sympathetic nerve arborizations. Without dense peri-adipocyte sympathetic innervation, environmental cold stimuli fail to deliver sufficient local norepinephrine to recruit beige adipocytes. Mechanism: Transcriptional and epigenetic remodelling of ageing adipocytes and PDGFRalpha+ stromal progenitors downregulates retrograde neurotrophic signals (NGF/TrkA and CLSTN3B-S100B axes) while upregulating semaphorin-neuropilin repulsive signalling, leading to axonal die-back of tyrosine hydroxylase-positive (TH+) sympathetic fibres and physical uncoupling of the neuro-adipose junction. Prediction: 3D whole-mount immunolabelling of aged scWAT will reveal a marked reduction in TH+ sympathetic nerve fibre density and branching prior to losing intrinsic adipocyte responsiveness to exogenous beta-3-adrenergic agonists (CL316,243), and viral restoration of NGF or S100B in aged scWAT will regenerate axonal arbors and restore cold-induced UCP1+ beige adipocyte formation.", "position": 0, "stratum": "selected", "selected": true, "human_score": 2, "judge_scores": [ 2, 2, 2 ], "judge_median": 2, "weight": 2.0 }, { "item": "33c5da9010", "id": "gpt-6-astra|N|R42758848|0", "task": "R42758848", "generator": "gpt-6-astra", "background": "Ageing is accompanied by a progressive weakening of adaptive immune responses, which reduces protection against infections and cancer. Effective immunity requires resting immune cells to preserve metabolic competence while remaining ready for rapid activation. Age-related changes in chromatin regulation and cellular metabolism have both been implicated in immune dysfunction. However, the mechanism that establishes this latent metabolic readiness and how ageing disrupts it remained unclear.", "question": "What developmentally established epigenetic mechanism preserves metabolic readiness for rapid immune activation, and how is it disrupted during ageing?", "finding": "Tonic IL-7 signaling establishes a GABPα-dependent program that deposits H2A.Z at oxidative-phosphorylation gene promoters in quiescent naïve CD8+ T cells, priming their rapid metabolic and functional activation. Age-related loss of IL-7 signaling reduces H2A.Z occupancy and impairs activation, while IL-7 supplementation or enforced H2A.Z expression rescues the defect.", "key_points": [ "Ageing reduces tonic IL-7 signaling", "GABPα regulates H2A.Z deposition", "H2A.Z primes OXPHOS gene promoters", "Loss of this axis impairs naïve CD8+ T-cell activation", "IL-7 or H2A.Z restoration rescues the age-related defect" ], "hypothesis": "During T-cell development, metabolic gene promoters acquire H3K4me2 marks that persist in resting naive T cells and enable rapid transcription after antigen recognition. Ageing erodes these marks, delaying metabolic activation despite preserved proximal receptor signalling. Mechanism: Developmentally deposited H3K4me2 maintains promoters of mitochondrial biogenesis and nutrient-utilization genes in a permissive state, accelerating recruitment of transcriptional machinery upon activation. Prediction: In phenotypically matched aged naive T cells, targeted restoration of H3K4me2 at affected promoters rescues early metabolic gene induction and subsequent proliferation without increasing baseline activation; targeted removal in young cells reproduces the defect.", "position": 0, "stratum": "split_1_2", "selected": false, "human_score": 2, "judge_scores": [ 3, 2, 2 ], "judge_median": 2, "weight": 2.8 }, { "item": "3900e3b9ef", "id": "gpt-6-astra|N|R42806003|3", "task": "R42806003", "generator": "gpt-6-astra", "background": "Advanced maternal age is associated with placental dysfunction, impaired fetal growth, and increased risks to offspring health. Ageing tissues commonly exhibit metabolic disruption, chronic inflammation, and accumulation of senescent cells with a senescence-associated secretory phenotype. The placenta contains interacting maternal and fetal compartments whose metabolic state and inflammatory environment influence pregnancy outcomes. However, the causal processes through which maternal ageing induces placental senescence and developmental complications remained unclear.", "question": "What intercellular mechanism causes placental senescence during maternal ageing, and can disrupting this mechanism restore placental and offspring health?", "finding": "Early inflammation and senescence-associated secretory phenotype activity induce IRF5-dependent CD38 expression in macrophages, which depletes NAD+ in decidual stromal cells and thereby promotes age-related placental senescence. Genetic or pharmacological disruption of this axis, including CD38 inhibition or NAD+ precursor treatment, reduces placental senescence, rescues intrauterine growth restriction, and improves offspring metabolic outcomes.", "key_points": [ "Early inflammation and SASP activate macrophage IRF5", "IRF5 increases macrophage CD38 expression", "Macrophage CD38 depletes stromal-cell NAD+", "NAD+ loss drives placental senescence", "CD38 inhibition or NAD+ replenishment rescues age-related outcomes" ], "hypothesis": "Maternal ageing impairs decidual natural killer cell clearance of senescent fetal trophoblasts, allowing these cells to accumulate and propagate senescence through their secretory phenotype. Restoring selective immune clearance should improve placental function and offspring outcomes. Mechanism: Reduced NKG2D-dependent recognition of stressed trophoblasts decreases their removal; surviving senescent cells release factors that induce secondary senescence in neighbouring trophoblast progenitors. Prediction: Aged and young pregnancies should initially generate comparable numbers of senescent trophoblasts, but aged pregnancies should show slower clearance. Restoring natural killer cell recognition should shorten senescent-cell persistence and suppress secondary senescence, with protection lost when trophoblast recognition ligands are absent.", "position": 3, "stratum": "unanimous_0", "selected": false, "human_score": 2, "judge_scores": [ 2, 1, 1 ], "judge_median": 1, "weight": 51.0 }, { "item": "391dff741e", "id": "gemini-4-argon-high|N|R42810392|0", "task": "R42810392", "generator": "gemini-4-argon-high", "background": "Ageing is strongly influenced by conserved systems that coordinate cellular metabolism with nutrient and energy availability. Genetic studies have shown that altering metabolic regulation can affect lifespan in several model organisms. Pharmacological studies, however, often use compounds with multiple targets, making it difficult to attribute longevity effects to a specific mechanism. It therefore remained unclear whether selective engagement of a single conserved metabolic target could directly produce longevity benefits across species.", "question": "Can direct pharmacological activation of a conserved metabolic target extend lifespan across evolutionarily diverse organisms and induce longevity-associated changes in mammals?", "finding": "Direct pharmacological activation of AMPK with compound 991 extends lifespan in Drosophila melanogaster, Caenorhabditis elegans, and Schizosaccharomyces pombe. In mice, 991 induces a proteomic profile associated with pro-longevity biology, supporting the translational potential of AMPK activation.", "key_points": [ "Direct AMPK activation by compound 991", "Lifespan extension in yeast, worms, and flies", "Conserved causal longevity effect across species", "Pro-longevity proteomic response in mice" ], "hypothesis": "Direct allosteric activation of the conserved energy sensor AMP-activated protein kinase (AMPK) is sufficient to extend lifespan across evolutionarily diverse invertebrates and induce caloric-restriction-like metabolic rejuvenation in mammals without requiring mitochondrial electron transport chain inhibition. Engaging AMPK directly via its allosteric binding pocket bypasses the pleiotropic off-target effects of indirect metabolic poisons to drive conserved pro-longevity programs. Mechanism: Selective small-molecule binding to the AMPK heterotrimeric complex (such as at the allosteric drug and metabolite [ADaM] site between the alpha-kinase domain and beta-carbohydrate-binding module) stabilizes the active enzyme conformation and prevents dephosphorylation of Thr172. Activated AMPK directly phosphorylates conserved downstream substrates—including ULK1 to initiate autophagy, ACC1/2 to promote fatty acid beta-oxidation, Raptor/TSC2 to restrain mTORC1 signaling, and FOXO/PGC-1alpha to enhance mitochondrial quality control and oxidative stress resistance. Prediction: Administration of a selective direct AMPK activator extends median and maximum lifespan in wild-type C. elegans and Drosophila and improves insulin sensitivity, autophagic flux, and transcriptomic age biomarkers in aged mice without altering cellular ATP/AMP ratios or complex I respiration, whereas genetic ablation of the catalytic AMPK alpha-subunit (aak-2 in worms, AMPKalpha in flies and mice) or point mutation of the allosteric drug-binding pocket completely abolishes both lifespan extension and mammalian metabolic benefits.", "position": 0, "stratum": "selected", "selected": true, "human_score": 4, "judge_scores": [ 3, 4, 5 ], "judge_median": 4, "weight": 2.0 }, { "item": "3acf20df8d", "id": "gpt-6-astra|N|R42806945|0", "task": "R42806945", "generator": "gpt-6-astra", "background": "Ageing is frequently accompanied by cognitive decline and chronic neuroinflammation. Cellular senescence and age-dependent changes in metabolic signaling can disrupt tissue homeostasis and contribute to functional deterioration in the brain. Although several circulating metabolic factors correlate with cognitive impairment, association alone does not establish which factors directly modify the ageing process. The molecular chain connecting a metabolic regulator to cellular dysfunction and cognitive outcomes therefore remained unresolved.", "question": "Which metabolic regulator causally mitigates ageing-related cognitive impairment, and through what molecular mechanism does it suppress cellular senescence and inflammation?", "finding": "Ghrelin alleviates ageing-related cognitive impairment by promoting autophagy-related activity and reducing senescence and inflammation in microglia through the SHBG/JNK1/Beclin1 axis. SHBG overexpression and JNK1 inhibition attenuate these effects, while Beclin1 overexpression partially restores them, supporting the proposed causal pathway; excessive ghrelin can also cause GHSR desensitization.", "key_points": [ "Ghrelin improves ageing-related cognitive impairment", "Microglial senescence and inflammation are reduced", "Autophagy-related signaling is enhanced", "The effect is mediated through the SHBG/JNK1/Beclin1 axis", "Beclin1 rescue supports the causal pathway" ], "hypothesis": "Restoring circulating fibroblast growth factor 21 (FGF21) mitigates ageing-related cognitive impairment by suppressing senescence in brain endothelial cells. Reduced endothelial inflammatory signaling preserves blood–brain barrier integrity and limits secondary microglial activation. Mechanism: FGF21 activates endothelial FGFR1–β-Klotho signaling, increasing AMPK-dependent SIRT1 activity and reducing mitochondrial oxidative stress. This reduces persistent DNA damage, p53–p21 senescence signaling, and NF-κB-dependent inflammatory secretion. Prediction: Endothelial-specific deletion of β-Klotho abolishes FGF21-induced improvements in endothelial senescence, barrier integrity, and memory despite preserved peripheral metabolic responses. Endothelial SIRT1 restoration rescues these effects downstream of receptor loss.", "position": 0, "stratum": "unanimous_0", "selected": false, "human_score": 1, "judge_scores": [ 2, 1, 2 ], "judge_median": 2, "weight": 51.0 }, { "item": "3b0bfac27c", "id": "gpt-6-astra|N|R42725837|3", "task": "R42725837", "generator": "gpt-6-astra", "background": "Cellular senescence is a stable stress response that contributes to tissue dysfunction, chronic inflammation, and multiple age-related diseases. Senescent cells accumulate with age, and experimentally reducing their abundance or activity can improve health-related outcomes in animal models. Transmembrane proteins can regulate intracellular signaling networks involved in stress responses and cell-fate decisions, but many remain poorly characterized in ageing. Identifying upstream regulators that causally control senescence could reveal therapeutic targets for age-associated disorders.", "question": "Does the transmembrane protein investigated in this study causally regulate cellular senescence and age-related tissue pathology, and through what signaling mechanism?", "finding": "PTCHD4 promotes cellular senescence and age-associated tissue dysfunction by enhancing AKT signaling. PTCHD4 deficiency suppressed senescence, alleviated ageing-related phenotypes and bleomycin-induced pulmonary fibrosis in mice, and its anti-senescent effect was reversed by restoring AKT signaling.", "key_points": [ "PTCHD4 causally promotes cellular senescence", "PTCHD4 deficiency improves ageing-related phenotypes and median lifespan in mice", "PTCHD4 deficiency reduces pulmonary fibrosis and preserves lung function", "AKT activation mediates the pro-senescent effect of PTCHD4" ], "hypothesis": "The investigated transmembrane protein promotes stable senescence and age-related fibrosis by increasing cellular responsiveness to TGF-β. Its inhibition prevents a transient stress arrest from becoming self-maintaining. Mechanism: The protein stabilizes TGF-β receptors at the plasma membrane, prolonging SMAD2/3 signaling and inducing p15, p21, and profibrotic secretory factors. Prediction: Protein depletion accelerates TGF-β receptor internalization and reduces sustained SMAD2/3 activation; constitutively active TGF-β receptor signaling restores persistent arrest and profibrotic secretion. Tissue-specific deletion reduces fibrosis under matched injury exposure.", "position": 3, "stratum": "split_1_2", "selected": false, "human_score": 1, "judge_scores": [ 3, 2, 2 ], "judge_median": 2, "weight": 2.8 }, { "item": "3cdda342a1", "id": "gemini-4-argon-high|N|R42736449|1", "task": "R42736449", "generator": "gemini-4-argon-high", "background": "Alzheimer's disease involves progressive neuronal dysfunction accompanied by broad molecular changes in the brain. Conventional genome annotation does not capture every translated product, leaving potentially functional proteins uncharacterized. Disease-associated changes in these overlooked products may occur independently of established proteins encoded at the same genomic loci. It remained unclear whether any such product contributes directly to cellular dysfunction in Alzheimer's disease.", "question": "Can an unannotated protein product that is altered in Alzheimer's disease causally regulate cellular function relevant to disease pathology?", "finding": "A small open reading frame at the MKKS locus encodes a 63-amino-acid microprotein that is the locus's predominant translation product and is downregulated in Alzheimer's disease. Experimental loss of this microprotein impairs mitochondrial respiration in microglia, supporting a causal role in microglial bioenergetics.", "key_points": [ "63-amino-acid microprotein encoded at the MKKS locus", "Predominant translation product of the locus", "Downregulated in Alzheimer's disease", "Its loss impairs microglial mitochondrial respiration" ], "hypothesis": "Disease-associated dysregulation of an unannotated small open reading frame (sORF)-encoded microprotein localized to the inner mitochondrial membrane causally impairs oxidative phosphorylation and drives bioenergetic failure in Alzheimer's disease neurons independently of the canonical protein encoded at the same locus. Mechanism: Uncoupled translational regulation or transcript isoform switching in Alzheimer's disease alters the abundance of a mitochondrial-targeted microprotein encoded by an upstream or overlapping reading frame. This microprotein normally acts as an assembly or stabilizing factor for electron transport chain supercomplexes, and its perturbation in disease disrupts Complex I/IV activity, reduces ATP synthesis, and elevates mitochondrial reactive oxygen species (mtROS). Prediction: Selective genetic restoration or ablation of the unannotated microprotein in neuronal models—while holding canonical host protein expression constant—directly modifies basal and maximal oxygen consumption rates, mitochondrial membrane potential, and mtROS levels, and affinity purification-mass spectrometry confirms its physical interaction with respiratory chain subunits.", "position": 1, "stratum": "selected", "selected": true, "human_score": 3, "judge_scores": [ 3, 3, 3 ], "judge_median": 3, "weight": 2.0 }, { "item": "3e748ebd19", "id": "claude-opus-5-5|N|R42810392|2", "task": "R42810392", "generator": "claude-opus-5-5", "background": "Ageing is strongly influenced by conserved systems that coordinate cellular metabolism with nutrient and energy availability. Genetic studies have shown that altering metabolic regulation can affect lifespan in several model organisms. Pharmacological studies, however, often use compounds with multiple targets, making it difficult to attribute longevity effects to a specific mechanism. It therefore remained unclear whether selective engagement of a single conserved metabolic target could directly produce longevity benefits across species.", "question": "Can direct pharmacological activation of a conserved metabolic target extend lifespan across evolutionarily diverse organisms and induce longevity-associated changes in mammals?", "finding": "Direct pharmacological activation of AMPK with compound 991 extends lifespan in Drosophila melanogaster, Caenorhabditis elegans, and Schizosaccharomyces pombe. In mice, 991 induces a proteomic profile associated with pro-longevity biology, supporting the translational potential of AMPK activation.", "key_points": [ "Direct AMPK activation by compound 991", "Lifespan extension in yeast, worms, and flies", "Conserved causal longevity effect across species", "Pro-longevity proteomic response in mice" ], "hypothesis": "Direct AMPK activation extends lifespan by engaging the same programme as dietary restriction and therefore does not add to it: the compound and DR are epistatic, and the compound's benefit appears only in animals on an unrestricted diet. Mechanism: AMPK is the obligatory energy-sensing node through which reduced nutrient intake is transduced into CRTC-1/CREB-dependent transcription in worms, FOXO/4E-BP-dependent translational remodelling in flies, and mTORC1 suppression plus PGC-1α-dependent mitochondrial remodelling in mammals. Pharmacological activation raises the same signal tonically, so once the pathway is saturated by DR no further gain is possible. Prediction: Lifespan of DR (or eat-2 mutant / intermittent-fasted) animals is not further extended by the activator, whereas ad libitum cohorts gain significantly; transcriptomic signatures of drug and DR overlap strongly (high rank-concordance in shared tissues). An independent, additive mechanism would instead show DR+drug exceeding either alone.", "position": 2, "stratum": "split_2_1", "selected": false, "human_score": 3, "judge_scores": [ 3, 2, 3 ], "judge_median": 3, "weight": 1.8 }, { "item": "40e670238a", "id": "grok-4.5|N|R42808804|4", "task": "R42808804", "generator": "grok-4.5", "background": "Age-related hearing loss is a common progressive disorder associated with degeneration of cochlear structure and function. Maintenance of cochlear homeostasis depends on a specialized vascular barrier that controls exchange between the circulation and inner-ear tissues. Ageing can compromise this barrier, disturb the local microenvironment, and contribute to auditory dysfunction. However, the causal molecular events connecting cochlear ageing to barrier failure and hearing decline were not fully understood.", "question": "What causal mechanism links cochlear ageing to loss of blood-labyrinth barrier integrity and auditory dysfunction?", "finding": "Age-dependent loss of IGF-1 lowers SLC25A33 expression in strial pericytes, causing mitochondrial reactive oxygen species accumulation and activation of TGF-β/Smad2 signaling. This drives pericyte phenotypic switching, disrupts blood-labyrinth barrier integrity, and worsens hearing loss, whereas IGF-1 supplementation or SLC25A33 overexpression suppresses the pathway and partially restores auditory function.", "key_points": [ "IGF-1 and SLC25A33 decline in aged strial pericytes", "SLC25A33 loss causes mitochondrial ROS accumulation", "Mitochondrial ROS activates TGF-β/Smad2 signaling and pericyte switching", "The pathway disrupts the blood-labyrinth barrier and aggravates hearing loss", "IGF-1 or SLC25A33 restoration partially rescues barrier and auditory function" ], "hypothesis": "Ageing elevates circulating and local TGF-β1, which drives endothelial-to-mesenchymal transition (EndMT) in cochlear capillaries, replacing tight-junction endothelium with leaky mesenchymal-like cells and thereby destroying BLB selectivity and auditory function. Mechanism: Chronic TGF-β/Smad signaling induces EndMT in strial vessels, reducing endothelial identity markers and junctional integrity while increasing fibronectin deposition and permeability, disturbing the cochlear microenvironment. Prediction: Aged cochleae will co-express mesenchymal markers (α-SMA, SNAIL) with residual endothelial markers in strial vessels; TGF-β neutralization or Smad3 inhibition will limit EndMT, preserve BLB tracer exclusion, and slow hearing decline relative to antioxidants that do not block TGF-β.", "position": 4, "stratum": "split_1_2", "selected": false, "human_score": 2, "judge_scores": [ 2, 3, 2 ], "judge_median": 2, "weight": 2.8 }, { "item": "47ef1ea547", "id": "gemini-4-argon-high|N|R42853938|0", "task": "R42853938", "generator": "gemini-4-argon-high", "background": "Therapy-induced cellular senescence can durably arrest the proliferation of cancer cells and contribute to treatment efficacy. Cancer cells can acquire resistance to treatments that normally induce this state, allowing continued growth and disease progression. Alternative splicing and epigenetic regulation are both frequently altered during cancer evolution, but their causal roles in suppressing treatment-induced senescence remain incompletely understood. Identifying the molecular mechanism responsible could reveal a way to restore therapeutic sensitivity.", "question": "What splicing-dependent mechanism enables resistance to CDK4/6 inhibition, and can disrupting it restore therapy-induced senescence?", "finding": "Increased inclusion of exon 2 drives SUV39H2 overexpression and CDK4/6 inhibitor resistance. Suppressing SUV39H2 expression or methyltransferase activity removes H3K9me3 from enhancer regions, opens associated promoters, activates p21 and other senescence-associated genes, and restores therapy-induced senescence.", "key_points": [ "SUV39H2 exon 2 inclusion increases SUV39H2 expression", "SUV39H2 promotes resistance to CDK4/6 inhibitors", "SUV39H2 targeting reduces enhancer-associated H3K9me3 and opens promoters", "p21 and other senescence-associated genes are transcriptionally activated", "Therapy-induced senescence and drug sensitivity are restored" ], "hypothesis": "Sustained activity of the protein arginine methyltransferase PRMT5 enables resistance to CDK4/6 inhibition by maintaining spliceosomal fidelity required for productive splicing of MDM4 and the histone methyltransferase EZH2. Pharmacological inhibition of PRMT5 or antisense oligonucleotide-mediated skipping of MDM4 exon 6 disrupts this axis, restoring p53 activation, H3K27me3 loss at senescence loci, and durable therapy-induced senescence. Mechanism: In drug-sensitive cells, CDK4/6 inhibition suppresses E2F-dependent expression of PRMT5 cofactors (such as WDR77/MEP50), reducing symmetric dimethylation of spliceosomal Sm proteins (SmD1/SmD3). This hypomethylation impairs recognition of weak 5' splice sites, causing exon 6 skipping in MDM4 (generating unstable MDM4-S subject to nonsense-mediated decay) and intron retention in EZH2, which together unleash p53-p21 signaling and derepress H3K27me3-silenced senescence genes. Resistant cells maintain high PRMT5-WDR77 activity independently of CDK4/6, preserving full-length MDM4 to degrade p53 and full-length EZH2 to epigenetically silence CDKN2A and SASP enhancers; blocking PRMT5 or directly forcing MDM4 exon 6 skipping re-establishes both p53 transcriptional activity and chromatin derepression required for irreversible arrest. Prediction: In CDK4/6 inhibitor-resistant cells with wild-type TP53, RNA-seq and anti-sDMA immunoprecipitation will reveal preserved Sm protein symmetric dimethylation alongside full-length MDM4 (exon 6 inclusion) and EZH2 transcripts, and combining palbociclib with a PRMT5 inhibitor or an MDM4 exon 6 splice-switching oligonucleotide—unlike inhibiting downstream CDK2 alone—will selectively restore SA-beta-gal activity and p21/SASP induction without requiring exogenous DNA damage.", "position": 0, "stratum": "selected", "selected": true, "human_score": 2, "judge_scores": [ 2, 2, 2 ], "judge_median": 2, "weight": 2.0 }, { "item": "4d965a1ef5", "id": "gemini-4-argon-high|N|R42725837|2", "task": "R42725837", "generator": "gemini-4-argon-high", "background": "Cellular senescence is a stable stress response that contributes to tissue dysfunction, chronic inflammation, and multiple age-related diseases. Senescent cells accumulate with age, and experimentally reducing their abundance or activity can improve health-related outcomes in animal models. Transmembrane proteins can regulate intracellular signaling networks involved in stress responses and cell-fate decisions, but many remain poorly characterized in ageing. Identifying upstream regulators that causally control senescence could reveal therapeutic targets for age-associated disorders.", "question": "Does the transmembrane protein investigated in this study causally regulate cellular senescence and age-related tissue pathology, and through what signaling mechanism?", "finding": "PTCHD4 promotes cellular senescence and age-associated tissue dysfunction by enhancing AKT signaling. PTCHD4 deficiency suppressed senescence, alleviated ageing-related phenotypes and bleomycin-induced pulmonary fibrosis in mice, and its anti-senescent effect was reversed by restoring AKT signaling.", "key_points": [ "PTCHD4 causally promotes cellular senescence", "PTCHD4 deficiency improves ageing-related phenotypes and median lifespan in mice", "PTCHD4 deficiency reduces pulmonary fibrosis and preserves lung function", "AKT activation mediates the pro-senescent effect of PTCHD4" ], "hypothesis": "The transmembrane protein causally enforces replicative and stress-induced cellular senescence by transducing extracellular matrix or growth-inhibitory cues into sustained activation of the DDR/MAPK-p53-p21CIP1 and p16INK4a-Rb tumor suppressor pathways. Targeted deletion of the protein in aged animals prevents senescent cell accumulation and preserves tissue regenerative capacity. Mechanism: Conformational activation of the transmembrane protein triggers intracellular kinase signaling (via Src/FAK, TGF-β/Smad, or sustained ERK hyperactivation) that induces replication stress and reactive oxygen species, activating ATM/ATR-CHK1/2 to phosphorylate p53 and transcriptionally upregulate p21CIP1 and p16INK4a, enforcing irreversible G1/S cell-cycle arrest via Rb dephosphorylation. Prediction: Ectopic overexpression of the wild-type transmembrane protein—but not an intracellular domain-truncated mutant—in young proliferating cells will rapidly induce γH2AX foci, p53 phosphorylation, and Rb-dependent proliferation arrest prior to SASP induction, and co-deletion of p53 or p16INK4a will rescue the proliferation defect.", "position": 2, "stratum": "split_1_2", "selected": false, "human_score": 1, "judge_scores": [ 3, 2, 2 ], "judge_median": 2, "weight": 2.8 }, { "item": "4dde87923d", "id": "gemini-4-argon-high|N|R42806572|0", "task": "R42806572", "generator": "gemini-4-argon-high", "background": "Senescent cells accumulate with age and can promote tissue dysfunction through persistent inflammatory and remodeling signals. Experimental removal of these cells can improve several age-related phenotypes, supporting cellular senescence as a causal contributor to declining health. Immune-mediated senolysis offers a way to eliminate selected senescent cells, but differences between therapeutic and toxic exposure can complicate translation. A major open problem is whether an externally controllable treatment can achieve effective senolysis in both rodents and primates while providing a practical marker of emerging toxicity.", "question": "Can a dose-titratable immune engager safely eliminate senescent cells and alleviate age-related pathology across mice and non-human primates, and what measurement can guide its safe dosing?", "finding": "A GFD-CD3 bispecific T-cell engager targeting uPAR-positive senescent cells caused dose-dependent senolysis and alleviated age-related pathologies in aged mice and non-human primates at low doses. High doses caused hepatotoxicity through T-cell attack on hepatic endothelial cells, while serum aminotransferase monitoring enabled dosing that retained senolytic efficacy without observed adverse effects.", "key_points": [ "GFD-CD3 targets uPAR-positive senescent cells", "Low-dose treatment produces senolysis in mice and non-human primates", "Senolysis alleviates age-related pathologies", "High-dose toxicity results from T-cell attack on hepatic endothelial cells", "Serum aminotransferase activity provides a safety monitor for dose titration" ], "hypothesis": "A short-half-life bispecific T-cell engager targeting urokinase plasminogen activator receptor (uPAR) and CD3 can dose-dependently eliminate senescent cells and alleviate metabolic and fibrotic pathology in aged mice and non-human primates. Circulating soluble uPAR (suPAR) kinetics paired with early serum IL-6-to-IFN-γ ratios provide a quantitative window to guide dosing and separate therapeutic senolysis from systemic cytokine toxicity. Mechanism: Senescent cells across rodents and primates upregulate membrane uPAR and shed suPAR into circulation; cross-linking uPAR-positive cells to CD3-positive T cells induces perforin/granzyme-mediated apoptosis proportional to receptor occupancy. While productive on-target cytolysis causes a transient shedding spike followed by a sustained drop in baseline plasma suPAR and moderate IFN-γ release, supratherapeutic dosing recruits bystander myeloid activation and triggers a disproportionate IL-6 surge. Prediction: Stepwise dose titration of a uPARxCD3 engager in aged mice and macaques will reduce tissue p16/SA-β-gal burden, lower steady-state plasma suPAR, and improve insulin sensitivity and liver fibrosis, whereas doses that elevate the 6-hour serum IL-6/IFN-γ ratio above a defined threshold will precede weight loss and transaminitis that promptly resolve upon pausing infusion.", "position": 0, "stratum": "unanimous_3", "selected": false, "human_score": 4, "judge_scores": [ 3, 3, 4 ], "judge_median": 3, "weight": 5.533333333333333 }, { "item": "4eca1c3321", "id": "gemini-4-argon-high|N|R42717261|3", "task": "R42717261", "generator": "gemini-4-argon-high", "background": "Cellular senescence can develop in immune populations and alter tissue function through persistent inflammatory and dysfunctional states. Such immunosenescence has been associated with chronic inflammatory disorders, but whether senescent immune cells directly cause disease progression has remained uncertain. Metabolic disruption and mitochondrial damage are recognized triggers of senescence, including through the abnormal release of mitochondrial components into the cytosol. The causal sequence connecting these processes to intestinal inflammation and treatment resistance was unresolved.", "question": "What mechanism induces pathogenic immune-cell senescence in ulcerative colitis, and does this senescence causally exacerbate the disease?", "finding": "NAD+ metabolic dysregulation causes mitochondrial dysfunction and cytosolic mitochondrial DNA leakage, activating cGAS-STING signaling to drive CD8+ T-cell senescence. These senescent cells exacerbate colitis, while systemic senolytic treatment reduces disease severity; their associated signature also predicts severe disease and non-response to biologic therapy.", "key_points": [ "NAD+ metabolic dysregulation initiates the process", "Mitochondrial dysfunction causes cytosolic mitochondrial DNA leakage", "cGAS-STING activation drives CD8+ T-cell senescence", "Senescent CD8+ T cells causally exacerbate colitis", "Senolytic clearance attenuates disease severity" ], "hypothesis": "Defective PINK1/Parkin-mediated mitophagy coupled with dysregulated purine nucleotide metabolism in mucosal CD8+ T cells leads to the accumulation of depolarized mitochondria that extrude damaged mtDNA and cardiolipin through the mitochondrial permeability transition pore (mPTP). This cytosolic mitochondrial danger signal induces ZBP1- and NLRP3-dependent cellular senescence that causally amplifies mucosal cytotoxicity and treatment resistance in ulcerative colitis. Mechanism: Metabolic exhaustion and purine nucleotide imbalance impair mitophagic flux in lamina propria CD8+ T cells, causing buildup of damaged mitochondria with elevated matrix calcium and oxidative stress. Persistent opening of the cyclophilin D-dependent mPTP releases oxidized Z-form mtDNA into the cytosol, which is sensed by ZBP1 and the NLRP3 inflammasome to enforce senescent growth arrest and granzyme B/cytokine hypersecretion that kills colonic crypt epithelial cells. Prediction: Pharmacological inhibition of mPTP opening with cyclosporin A derivatives or CD8+ T-cell-specific deletion of Zbp1 will block cytosolic Z-mtDNA sensing, eliminate senescent granzyme-secreting CD8+ T cells, and attenuate colitis severity more effectively than VDAC or MAVS blockade.", "position": 3, "stratum": "split_1_2", "selected": false, "human_score": 3, "judge_scores": [ 2, 2, 3 ], "judge_median": 2, "weight": 2.8 }, { "item": "503e8cdff0", "id": "grok-4.5|N|R42669067|0", "task": "R42669067", "generator": "grok-4.5", "background": "Cellular senescence is an irreversible growth-arrest state that contributes to ageing and age-related pathology. Senescent cells undergo changes in genome organization and can activate normally repressed repetitive DNA elements. Such activation may compromise genome stability and provoke inflammatory signaling. The regulatory mechanisms that preserve repeat silencing and thereby limit senescence remained incompletely understood.", "question": "How does SIRT1 regulate L1 retrotransposon activity, and does this regulation affect cellular senescence?", "finding": "SIRT1 suppresses L1 transcription and retrotransposition by promoting the association and recruitment of Lamin B1 and KAP1 at the L1 5′-UTR, increasing repressive H3K9me3 chromatin. SIRT1 deficiency derepresses L1, activates cGAS–STING signaling, and induces cellular senescence; reverse-transcriptase inhibition with 3TC rescues this phenotype.", "key_points": [ "SIRT1 represses L1 transcription and retrotransposition", "SIRT1 stabilizes Lamin B1–KAP1 interactions at the L1 5′-UTR", "The mechanism increases repressive H3K9me3 chromatin", "SIRT1 loss activates L1-dependent cGAS–STING signaling and senescence", "3TC rescues senescence caused by SIRT1 deficiency" ], "hypothesis": "SIRT1 maintains L1 silencing by deacetylating histone H3K9/H4K16 at L1 promoter and 5' UTR chromatin; decline of SIRT1 activity during senescence causes L1 transcriptional derepression that accelerates the senescence program. Mechanism: NAD+-dependent local chromatin deacetylation by SIRT1 preserves repressive chromatin at L1 loci; loss of this mark permits RNA polymerase II access and L1 mRNA production. Prediction: ChIP-seq will show increased H3K9ac/H4K16ac and reduced H3K9me3 specifically at L1 5' UTRs after SIRT1 knockdown or catalytic inhibition, preceding elevated L1 RNA and earlier SA-β-gal/p16 induction; a L1-promoter-targeted deacetylase tether will rescue silencing without restoring global SIRT1 activity.", "position": 0, "stratum": "selected", "selected": true, "human_score": 3, "judge_scores": [ 3, 3, 3 ], "judge_median": 3, "weight": 2.0 }, { "item": "5150558ef5", "id": "claude-opus-5-5|N|R42725837|0", "task": "R42725837", "generator": "claude-opus-5-5", "background": "Cellular senescence is a stable stress response that contributes to tissue dysfunction, chronic inflammation, and multiple age-related diseases. Senescent cells accumulate with age, and experimentally reducing their abundance or activity can improve health-related outcomes in animal models. Transmembrane proteins can regulate intracellular signaling networks involved in stress responses and cell-fate decisions, but many remain poorly characterized in ageing. Identifying upstream regulators that causally control senescence could reveal therapeutic targets for age-associated disorders.", "question": "Does the transmembrane protein investigated in this study causally regulate cellular senescence and age-related tissue pathology, and through what signaling mechanism?", "finding": "PTCHD4 promotes cellular senescence and age-associated tissue dysfunction by enhancing AKT signaling. PTCHD4 deficiency suppressed senescence, alleviated ageing-related phenotypes and bleomycin-induced pulmonary fibrosis in mice, and its anti-senescent effect was reversed by restoring AKT signaling.", "key_points": [ "PTCHD4 causally promotes cellular senescence", "PTCHD4 deficiency improves ageing-related phenotypes and median lifespan in mice", "PTCHD4 deficiency reduces pulmonary fibrosis and preserves lung function", "AKT activation mediates the pro-senescent effect of PTCHD4" ], "hypothesis": "The transmembrane protein acts as a cell-autonomous driver of senescence: its expression rises in aged and stressed tissue, and raising it is sufficient to push proliferating cells into a stable senescent arrest, while deleting it blocks senescence entry and reduces age-related tissue pathology. Mechanism: Stress-induced upregulation of the protein at the plasma membrane raises its local surface density, enabling ligand-independent clustering and constitutive assembly of an intracellular adaptor complex. The signal converges on NF-kB/p38 to sustain the SASP while p53-p21 and p16-Rb enforce the arrest, creating a feed-forward loop in which SASP cytokines further induce the protein. Prediction: Overexpression in young primary cells with intact p53 produces SA-beta-gal positivity, p21/p16 induction and SASP secretion without added stress, and conditional knockout in an aged or progeroid mouse lowers p16 burden and improves tissue histology and function; a signaling-dead point mutant that still reaches the membrane fails to do either, excluding mere protein-burden or ER-stress effects.", "position": 0, "stratum": "selected", "selected": true, "human_score": 1, "judge_scores": [ 3, 3, 2 ], "judge_median": 3, "weight": 2.0 }, { "item": "5ecd52bcb5", "id": "grok-4.5|N|R42647119|1", "task": "R42647119", "generator": "grok-4.5", "background": "Cellular reprogramming offers a potential way to replace neurons lost through injury or neurodegenerative disease. Most regenerative strategies have been developed and validated in young experimental animals, although advanced age is the principal risk factor for many neurological disorders. Aging can alter both the plasticity of resident cells and the tissue response to injury. It was therefore unclear whether neuronal reprogramming would remain effective in aged neural tissue and which age-associated processes might limit it.", "question": "How does aging affect injury-induced neuronal reprogramming in the retina, and what mechanisms account for any age-related loss of regenerative capacity?", "finding": "Aging suppresses Müller glia-to-neuron reprogramming by preventing activation of progenitor programs while promoting reactive and inflammatory glial states and an exaggerated retinal neuroimmune response. Dexamethasone partially restores neurogenesis, confirming that age-associated inflammation is a causal, therapeutically tractable component of the regenerative defect, alongside glial-intrinsic barriers.", "key_points": [ "Aged Müller glia generate fewer neurons across three reprogramming strategies", "Aged glia fail to activate progenitor programs", "Reactive and inflammatory states increase with age", "The injured aged retina mounts an exaggerated neuroimmune response", "Dexamethasone partially rescues neurogenesis" ], "hypothesis": "Aging limits retinal neuronal reprogramming by locking Müller glia into a more rigid epigenetic state that resists injury-triggered fate conversion. Restoring youthful chromatin accessibility at neurogenic loci in aged Müller glia will rescue reprogramming. Mechanism: Age-dependent accumulation of repressive chromatin marks and reduced pioneer-factor accessibility at Ascl1 targets and neuronal gene loci prevents injury cues from opening the neurogenic program in Müller glia. Prediction: Aged Müller glia will exhibit reduced chromatin accessibility and higher H3K27me3/DNA methylation at neurogenic loci after injury relative to young glia; transient epigenetic remodeling (e.g., HDAC or EZH2 inhibition timed with injury) will preferentially increase reprogrammed neurons in aged retina and reopen accessibility at those loci.", "position": 1, "stratum": "split_2_1", "selected": false, "human_score": 3, "judge_scores": [ 3, 3, 2 ], "judge_median": 3, "weight": 1.8 }, { "item": "5f51ad098a", "id": "gpt-6-astra|N|R42725837|0", "task": "R42725837", "generator": "gpt-6-astra", "background": "Cellular senescence is a stable stress response that contributes to tissue dysfunction, chronic inflammation, and multiple age-related diseases. Senescent cells accumulate with age, and experimentally reducing their abundance or activity can improve health-related outcomes in animal models. Transmembrane proteins can regulate intracellular signaling networks involved in stress responses and cell-fate decisions, but many remain poorly characterized in ageing. Identifying upstream regulators that causally control senescence could reveal therapeutic targets for age-associated disorders.", "question": "Does the transmembrane protein investigated in this study causally regulate cellular senescence and age-related tissue pathology, and through what signaling mechanism?", "finding": "PTCHD4 promotes cellular senescence and age-associated tissue dysfunction by enhancing AKT signaling. PTCHD4 deficiency suppressed senescence, alleviated ageing-related phenotypes and bleomycin-induced pulmonary fibrosis in mice, and its anti-senescent effect was reversed by restoring AKT signaling.", "key_points": [ "PTCHD4 causally promotes cellular senescence", "PTCHD4 deficiency improves ageing-related phenotypes and median lifespan in mice", "PTCHD4 deficiency reduces pulmonary fibrosis and preserves lung function", "AKT activation mediates the pro-senescent effect of PTCHD4" ], "hypothesis": "The investigated transmembrane protein promotes cellular senescence by sustaining growth signaling after cellular damage. Its loss reduces senescence-associated inflammation and age-related tissue pathology. Mechanism: The protein activates PI3K–AKT–mTORC1 signaling, sustaining anabolic activity and the senescence-associated secretory phenotype (SASP) during damage-induced cell-cycle arrest. Prediction: Inducible loss of the protein reduces mTORC1 activity, persistent senescence markers, and SASP output under matched damage conditions; constitutively active Rheb restores these effects. Deletion in aged animals improves tissue function without increasing proliferation of damaged cells.", "position": 0, "stratum": "unanimous_3", "selected": false, "human_score": 3, "judge_scores": [ 4, 4, 4 ], "judge_median": 4, "weight": 5.533333333333333 }, { "item": "5f7cf93ef4", "id": "gpt-6-astra|N|R42664348|0", "task": "R42664348", "generator": "gpt-6-astra", "background": "Osteoarthritis is a common age-related disorder characterized by progressive joint deterioration, inflammation, pain, and loss of mobility. Obesity substantially increases osteoarthritis risk, including in joints that do not bear additional body weight, suggesting that mechanical loading alone cannot explain the association. Adipose tissue can influence distant organs through circulating signals, but the molecular basis of its contribution to joint degeneration remained unclear. Identifying the responsible signals and downstream processes could reveal targets for preventing or treating obesity-associated osteoarthritis.", "question": "By what causal molecular mechanism does excess adiposity promote osteoarthritis progression, and can disrupting that mechanism reduce joint pathology?", "finding": "Adipocyte-derived extracellular vesicles enriched in mitochondrial components transfer mitochondrial DNA to chondrocytes, where it activates cGAS-STING signaling and causes inflammation, metabolic dysfunction, senescence, and cartilage degeneration. Genetic or pharmacological inhibition of this pathway attenuates cartilage damage, pain behaviors, and gait abnormalities.", "key_points": [ "Adipocyte-derived EV-Mito carry mitochondrial DNA", "Mitochondrial DNA is transferred to chondrocytes", "Transferred DNA activates cGAS-STING signaling", "The pathway drives senescence and cartilage degeneration", "cGAS-STING inhibition reduces osteoarthritis pathology" ], "hypothesis": "Excess adiposity increases delivery of adipose-derived extracellular vesicles carrying miR-34a to articular chondrocytes, promoting senescence and cartilage degradation. Blocking this transfer or its intracellular target interaction will slow osteoarthritis progression. Mechanism: Vesicular miR-34a suppresses chondrocyte SIRT1, increasing p53 acetylation and a senescence-associated secretory phenotype that includes inflammatory cytokines and cartilage-degrading proteases. Prediction: Adipocyte-specific miR-34a deletion will reduce cartilage damage without changing adiposity or joint loading. Physiological replacement with miR-34a-containing adipocyte vesicles will restore pathology, whereas replacement with miR-34a-depleted vesicles will not; chondrocyte expression of miR-34a-resistant SIRT1 will prevent restoration.", "position": 0, "stratum": "split_2_1", "selected": false, "human_score": 3, "judge_scores": [ 3, 3, 2 ], "judge_median": 3, "weight": 1.8 }, { "item": "6128451f52", "id": "claude-opus-5-5|N|R42689491|1", "task": "R42689491", "generator": "claude-opus-5-5", "background": "Hutchinson-Gilford progeria syndrome is a rare genetic disorder characterized by accelerated, multisystem features of ageing. Progressive skeletal abnormalities are a prominent component of the disease in both patients and experimental models. These abnormalities involve impaired bone formation, remodeling, and mechanical integrity. It remained unclear whether established skeletal pathology could be meaningfully reversed in vivo and how strongly therapeutic efficacy would depend on the age at treatment.", "question": "Can in vivo correction of the HGPS-causing mutation rescue molecular, cellular, and structural defects in bone, and how does treatment timing affect efficacy?", "finding": "Adenine base editing of the pathogenic LMNA variant reduced progerin expression, restored extracellular-matrix deposition and mineralization in progeroid osteoblasts, and partially rescued bone structure and physical properties in mice. In vivo correction was strongly age-dependent, with early postnatal delivery producing substantially greater editing and skeletal benefit than later treatment.", "key_points": [ "Correction of the pathogenic LMNA variant", "Reduced progerin transcripts and protein", "Improved osteoblast matrix deposition and mineralization", "Partial rescue of bone structure and physical properties", "Greater efficacy with early postnatal treatment" ], "hypothesis": "Mutation correction before the onset of radiographically detectable skeletal disease will prevent bone pathology almost completely, whereas the identical intervention delivered after structural deficits are established will halt progression and partially rebuild bone but will not fully normalize geometry or strength. Efficacy will therefore show a threshold dependence on treatment age rather than a smooth linear decline. Mechanism: Early correction acts on a still-intact progenitor pool and an unremodeled matrix, so normal modeling can proceed. Once progerin has driven progenitor exhaustion/senescence and produced irreversibly altered cortical geometry and hypermineralized or collagen-cross-link-abnormal matrix, correction restores cell function but remodeling cannot re-sculpt macroscopic shape (e.g., clavicular and rib thinning, acro-osteolysis-like resorption) within the animal's lifespan. Prediction: Matched cohorts treated at a pre-symptomatic versus an established-disease age will show equal normalization of molecular markers (progerin levels, osteogenic gene expression) but divergent structural outcomes: near-complete rescue early, and in the late group restoration of dynamic bone formation rate with only partial recovery of cortical area and failure load.", "position": 1, "stratum": "selected", "selected": true, "human_score": 4, "judge_scores": [ 4, 3, 3 ], "judge_median": 3, "weight": 2.0 }, { "item": "6518e89ff9", "id": "claude-opus-5-5|N|R42717261|3", "task": "R42717261", "generator": "claude-opus-5-5", "background": "Cellular senescence can develop in immune populations and alter tissue function through persistent inflammatory and dysfunctional states. Such immunosenescence has been associated with chronic inflammatory disorders, but whether senescent immune cells directly cause disease progression has remained uncertain. Metabolic disruption and mitochondrial damage are recognized triggers of senescence, including through the abnormal release of mitochondrial components into the cytosol. The causal sequence connecting these processes to intestinal inflammation and treatment resistance was unresolved.", "question": "What mechanism induces pathogenic immune-cell senescence in ulcerative colitis, and does this senescence causally exacerbate the disease?", "finding": "NAD+ metabolic dysregulation causes mitochondrial dysfunction and cytosolic mitochondrial DNA leakage, activating cGAS-STING signaling to drive CD8+ T-cell senescence. These senescent cells exacerbate colitis, while systemic senolytic treatment reduces disease severity; their associated signature also predicts severe disease and non-response to biologic therapy.", "key_points": [ "NAD+ metabolic dysregulation initiates the process", "Mitochondrial dysfunction causes cytosolic mitochondrial DNA leakage", "cGAS-STING activation drives CD8+ T-cell senescence", "Senescent CD8+ T cells causally exacerbate colitis", "Senolytic clearance attenuates disease severity" ], "hypothesis": "Senescent immune cells cause resistance to anti-inflammatory therapy in UC: their SASP maintains an inflammatory circuit that is not dependent on the single cytokine being blocked. Adding senescence-targeting treatment restores responsiveness. Mechanism: The SASP is multi-cytokine and self-reinforcing (IL-6/STAT3, IL-1β, TNF, chemokine-driven neutrophil recruitment, and local paracrine spread of senescence to neighboring immune and stromal cells). Blocking one node (TNF, IL-12/23, JAK partially) leaves the rest of the circuit intact, so inflammation persists; removing the senescent source collapses the whole circuit. Prediction: Pre-treatment mucosal senescence burden (p16/p21-high immune cells, SASP transcriptional signature) is higher in future non-responders to anti-TNF and stratifies response better than baseline CRP/histology; in a colitis model refractory to anti-TNF, combining anti-TNF with senolytics or a STING inhibitor restores remission whereas either alone does not.", "position": 3, "stratum": "selected", "selected": true, "human_score": 3, "judge_scores": [ 2, 2, 2 ], "judge_median": 2, "weight": 2.0 }, { "item": "66ffafa15e", "id": "claude-opus-5-5|N|R42853938|2", "task": "R42853938", "generator": "claude-opus-5-5", "background": "Therapy-induced cellular senescence can durably arrest the proliferation of cancer cells and contribute to treatment efficacy. Cancer cells can acquire resistance to treatments that normally induce this state, allowing continued growth and disease progression. Alternative splicing and epigenetic regulation are both frequently altered during cancer evolution, but their causal roles in suppressing treatment-induced senescence remain incompletely understood. Identifying the molecular mechanism responsible could reveal a way to restore therapeutic sensitivity.", "question": "What splicing-dependent mechanism enables resistance to CDK4/6 inhibition, and can disrupting it restore therapy-induced senescence?", "finding": "Increased inclusion of exon 2 drives SUV39H2 overexpression and CDK4/6 inhibitor resistance. Suppressing SUV39H2 expression or methyltransferase activity removes H3K9me3 from enhancer regions, opens associated promoters, activates p21 and other senescence-associated genes, and restores therapy-induced senescence.", "key_points": [ "SUV39H2 exon 2 inclusion increases SUV39H2 expression", "SUV39H2 promotes resistance to CDK4/6 inhibitors", "SUV39H2 targeting reduces enhancer-associated H3K9me3 and opens promoters", "p21 and other senescence-associated genes are transcriptionally activated", "Therapy-induced senescence and drug sensitivity are restored" ], "hypothesis": "A splicing factor amplified or upregulated in resistant cells acts upstream of both splicing and chromatin by generating an isoform of a DNA/RNA-binding repressor that recruits a histone deacetylase or PRC complex to the SASP enhancer landscape; this converts potential senescence into a reversible quiescent state. Inhibiting the splicing factor restores full senescence. Mechanism: Senescence requires SASP enhancer activation and chromatin remodeling, not just cell-cycle exit. The resistance isoform occupies these enhancers and blocks BRD4/NF-κB loading, so cells arrest only transiently and re-enter cycle after drug withdrawal. Prediction: Pharmacologic splicing-factor inhibition (e.g. SF3B or CLK inhibitors) or targeted knockdown converts drug-induced quiescence into stable senescence, measured by failure to form colonies after drug washout plus restored SASP secretion; the effect is rescued by re-expressing the specific downstream isoform, proving it is the operative effector rather than general spliceosome stress.", "position": 2, "stratum": "unanimous_0", "selected": false, "human_score": 3, "judge_scores": [ 2, 2, 2 ], "judge_median": 2, "weight": 51.0 }, { "item": "6a5d5733e4", "id": "gemini-4-argon-high|N|R42647119|0", "task": "R42647119", "generator": "gemini-4-argon-high", "background": "Cellular reprogramming offers a potential way to replace neurons lost through injury or neurodegenerative disease. Most regenerative strategies have been developed and validated in young experimental animals, although advanced age is the principal risk factor for many neurological disorders. Aging can alter both the plasticity of resident cells and the tissue response to injury. It was therefore unclear whether neuronal reprogramming would remain effective in aged neural tissue and which age-associated processes might limit it.", "question": "How does aging affect injury-induced neuronal reprogramming in the retina, and what mechanisms account for any age-related loss of regenerative capacity?", "finding": "Aging suppresses Müller glia-to-neuron reprogramming by preventing activation of progenitor programs while promoting reactive and inflammatory glial states and an exaggerated retinal neuroimmune response. Dexamethasone partially restores neurogenesis, confirming that age-associated inflammation is a causal, therapeutically tractable component of the regenerative defect, alongside glial-intrinsic barriers.", "key_points": [ "Aged Müller glia generate fewer neurons across three reprogramming strategies", "Aged glia fail to activate progenitor programs", "Reactive and inflammatory states increase with age", "The injured aged retina mounts an exaggerated neuroimmune response", "Dexamethasone partially rescues neurogenesis" ], "hypothesis": "Aging impairs injury-induced retinal neuronal reprogramming by priming resident microglia toward a persistent pro-inflammatory state that locks Müller glia into reactive gliosis rather than neurogenesis. Chronic inflammatory signaling after injury in aged retinas actively antagonizes proneural transcription factor activity in Müller glia. Mechanism: In aged retinas, senescent and dystrophic microglia respond to injury with sustained secretion of TNF-alpha, IL-6, and IL-1beta, driving prolonged hyperactivation of JAK/STAT3 and NF-kappaB signaling within Müller glia. Phosphorylated STAT3 and RelA/p65 directly compete with proneural pioneer factors such as Ascl1 for transcriptional co-activators and promote expression of gliogenic and inhibitory factors (such as Id1/3, Socs3, and Gfap), blocking the transition from reactive glia to neurogenic progenitors. Prediction: Microglial depletion (e.g., via CSF1R inhibition) or Müller glia-specific inhibition of STAT3/NF-kappaB signaling in aged injured retinas will restore Ascl1-driven neurogenic reprogramming efficiency to youthful levels, even without directly altering the intrinsic epigenetic landscape of Müller glia prior to injury.", "position": 0, "stratum": "selected", "selected": true, "human_score": 3, "judge_scores": [ 4, 4, 4 ], "judge_median": 4, "weight": 2.0 }, { "item": "6bb77f3299", "id": "gemini-4-argon-high|N|R42822442|0", "task": "R42822442", "generator": "gemini-4-argon-high", "background": "Solid tumors create metabolically stressful microenvironments in which rapidly proliferating malignant and immune cells compete for limited nutrients. Adoptively transferred immune cells often lose function and fail to persist under these conditions, limiting therapeutic efficacy. Cellular senescence can produce durable functional decline in immune cells, but the metabolic signals that initiate this state within tumors have remained incompletely understood. Identifying the causal signaling events could reveal ways to preserve therapeutic immune-cell activity.", "question": "How does nutrient scarcity in the solid-tumor microenvironment cause senescence and loss of persistence in adoptively transferred antitumor immune cells?", "finding": "Glucose deprivation activates AMPK in transferred Th9 cells, initiating a ZAK–NIK cascade that suppresses noncanonical NF-κB signaling and IL-9 production, thereby driving cellular senescence. Restoring glucose or targeting ZAK reduces senescence, improves Th9-cell persistence, and enhances CAR-Th9 efficacy against solid tumors.", "key_points": [ "Glucose deprivation causes Th9-cell senescence", "AMPK is activated by glucose scarcity", "The ZAK–NIK cascade suppresses noncanonical NF-κB signaling and IL-9", "ZAK targeting rejuvenates Th9 cells and improves antitumor efficacy" ], "hypothesis": "Competition for glucose in the solid-tumor microenvironment triggers premature senescence in adoptively transferred immune cells by activating a Sestrin–AMPK–TAB1 macromolecular complex that drives non-canonical p38 MAPK autophosphorylation and cPLA2α-mediated lipid droplet accumulation. Mechanism: Extracellular glucose depletion lowers the intracellular ATP/AMP ratio and glycolytic intermediates, promoting the assembly of Sestrins (SESN1/2/3) and AMPK with the scaffold protein TAB1. This complex induces p38 MAPK autophosphorylation independently of canonical MAP2K3/6 signaling, which simultaneously inhibits telomerase (TERT) activity, downregulates costimulatory receptors (CD27/CD28), and activates cytosolic phospholipase A2α (cPLA2α) to drive unbalanced intracellular lipid accumulation and p16INK4a/p21CIP1-dependent cell cycle arrest. Prediction: Genetic ablation of TAB1/Sestrins or pharmacological inhibition of p38 MAPK or cPLA2α in adoptively transferred T or NK cells will prevent glucose starvation–induced lipid droplet accumulation and p16INK4a/p21CIP1 upregulation, preserving telomerase activity and intratumoral persistence even when extracellular glucose remains depleted.", "position": 0, "stratum": "split_2_1", "selected": false, "human_score": 3, "judge_scores": [ 3, 3, 2 ], "judge_median": 3, "weight": 1.8 }, { "item": "6d5fc32f4c", "id": "gemini-4-argon-high|N|R42822442|1", "task": "R42822442", "generator": "gemini-4-argon-high", "background": "Solid tumors create metabolically stressful microenvironments in which rapidly proliferating malignant and immune cells compete for limited nutrients. Adoptively transferred immune cells often lose function and fail to persist under these conditions, limiting therapeutic efficacy. Cellular senescence can produce durable functional decline in immune cells, but the metabolic signals that initiate this state within tumors have remained incompletely understood. Identifying the causal signaling events could reveal ways to preserve therapeutic immune-cell activity.", "question": "How does nutrient scarcity in the solid-tumor microenvironment cause senescence and loss of persistence in adoptively transferred antitumor immune cells?", "finding": "Glucose deprivation activates AMPK in transferred Th9 cells, initiating a ZAK–NIK cascade that suppresses noncanonical NF-κB signaling and IL-9 production, thereby driving cellular senescence. Restoring glucose or targeting ZAK reduces senescence, improves Th9-cell persistence, and enhances CAR-Th9 efficacy against solid tumors.", "key_points": [ "Glucose deprivation causes Th9-cell senescence", "AMPK is activated by glucose scarcity", "The ZAK–NIK cascade suppresses noncanonical NF-κB signaling and IL-9", "ZAK targeting rejuvenates Th9 cells and improves antitumor efficacy" ], "hypothesis": "Scarcity of glucose, glutamine, and serine in the tumor microenvironment starves de novo nucleotide biosynthesis during antigen-driven clonal expansion, causing replication fork stalling and chronic ATR/ATM–CHK1/2–p53 signaling that enforces DNA damage–induced senescence. Mechanism: Engagement of chimeric antigen receptors (CARs) or T-cell receptors (TCRs) by tumor antigens delivers strong proliferative signals that require rapid DNA replication, while simultaneous scarcity of glucose (pentose phosphate pathway), glutamine (nitrogen donor), and serine/glycine (one-carbon metabolism) depletes intracellular dNTP pools. Attempting S-phase progression under dNTP scarcity causes replication fork collapse, uracil misincorporation, and persistent double-strand DNA breaks (γH2AX foci), chronically activating the ATR/ATM–CHK1/CHK2–p53–p21CIP1 DNA damage response cascade to lock cells into premature replicative senescence. Prediction: Supplementing nutrient-starved immune cells with exogenous nucleosides or overexpressing nucleotide salvage pathway enzymes (such as deoxycytidine kinase) during antigen stimulation will abolish γH2AX accumulation, block ATR/ATM-dependent p21/p16 induction, and restore in vivo persistence without restoring glycolytic ATP production or amino acid levels.", "position": 1, "stratum": "unanimous_0", "selected": false, "human_score": 2, "judge_scores": [ 2, 2, 1 ], "judge_median": 2, "weight": 51.0 }, { "item": "6d6022d6bb", "id": "gpt-6-astra|N|R42647635|0", "task": "R42647635", "generator": "gpt-6-astra", "background": "Ageing is accompanied by progressive molecular damage, impaired tissue maintenance, and declining physiological function. Genetic studies in laboratory organisms have identified processes that can influence lifespan and cellular senescence. However, findings from small-animal models do not always translate directly to humans because of major differences in physiology, metabolism, and lifespan. A large-mammal model is therefore valuable for testing whether a proposed source of molecular damage can directly produce systemic ageing phenotypes.", "question": "Does experimentally increasing somatic mitochondrial DNA mutation burden cause premature ageing and shortened lifespan in a large mammal?", "finding": "Prime-edited pigs expressing proofreading-deficient POLG accumulated elevated somatic mitochondrial DNA mutations and developed systemic premature-ageing phenotypes. These included weight loss, rough hair, anaemia, tissue abnormalities, increased apoptosis, elevated senescence-associated markers, and shortened lifespan.", "key_points": [ "Proofreading-deficient POLG", "Increased somatic mitochondrial DNA mutations", "Systemic premature-ageing phenotypes", "Increased apoptosis and senescence markers", "Shortened lifespan" ], "hypothesis": "Experimentally increasing somatic mitochondrial DNA mutation burden after development causes premature multisystem ageing and shortens lifespan in a large mammal by impairing oxidative phosphorylation. Mechanism: Pathogenic mutations compromise respiratory-chain function, reducing ATP production and causing progressive failure in tissues with high energy demands. Prediction: Respiratory impairment precedes functional decline, and mutation burden predicts ageing phenotypes through its effect on respiratory capacity. An intervention that restores respiratory function without lowering mutation burden delays decline and improves survival.", "position": 0, "stratum": "split_2_1", "selected": false, "human_score": 3, "judge_scores": [ 3, 4, 2 ], "judge_median": 3, "weight": 1.8 }, { "item": "7218b47310", "id": "grok-4.5|N|R42805954|0", "task": "R42805954", "generator": "grok-4.5", "background": "Ageing is associated with declining thermogenic capacity in adipose tissue, impaired energy expenditure, and increased susceptibility to metabolic dysfunction. Subcutaneous white adipose tissue can acquire heat-producing adipocytes in response to environmental stimuli, but this capacity diminishes with age. Communication between the nervous system and adipose tissue helps regulate this adaptive response. The mechanisms responsible for its age-related deterioration remained incompletely understood.", "question": "What causal mechanism contributes to the age-related decline of thermogenic adipocytes in subcutaneous white adipose tissue?", "finding": "Microglial ALKBH5 suppresses Ntf5 expression by demethylating Ntf5 mRNA, thereby limiting activation of PVH TrkB-positive neurons, sympathetic innervation of subcutaneous white adipose tissue, and adipocyte browning. Microglia-specific ALKBH5 knockout preserved brown adipocytes and improved metabolic activity during ageing in male mice.", "key_points": [ "Microglial ALKBH5 restrains adipocyte browning", "ALKBH5 knockout increases Ntf5 mRNA m6A methylation and Ntf5 expression", "Ntf5 activates PVH TrkB-positive neurons and downstream sympathetic innervation", "Microglia-specific ALKBH5 loss prevents age-related brown adipocyte decline", "The causal findings were demonstrated in male mice" ], "hypothesis": "Age-related loss of sympathetic innervation density and norepinephrine release in subcutaneous white adipose tissue causally impairs β3-adrenergic recruitment of thermogenic (beige) adipocytes. Restoring local catecholaminergic tone would therefore rescue cold- or agonist-induced browning in aged animals. Mechanism: Progressive sympathetic axon rarefaction and reduced vesicular norepinephrine availability lower β3-AR–cAMP–PKA signaling in adipocyte progenitors and mature adipocytes, preventing UCP1 induction and beige differentiation. Prediction: Aged scWAT will show reduced tyrosine hydroxylase+ fiber density and lower tissue norepinephrine; local β3-agonist delivery or chemogenetic reactivation of adipose-projecting sympathetic neurons will restore UCP1+ beige adipocytes and cold-induced energy expenditure without requiring systemic endocrine rescue.", "position": 0, "stratum": "selected", "selected": true, "human_score": 2, "judge_scores": [ 3, 3, 2 ], "judge_median": 3, "weight": 2.0 }, { "item": "744867606d", "id": "gpt-6-astra|N|R42810392|0", "task": "R42810392", "generator": "gpt-6-astra", "background": "Ageing is strongly influenced by conserved systems that coordinate cellular metabolism with nutrient and energy availability. Genetic studies have shown that altering metabolic regulation can affect lifespan in several model organisms. Pharmacological studies, however, often use compounds with multiple targets, making it difficult to attribute longevity effects to a specific mechanism. It therefore remained unclear whether selective engagement of a single conserved metabolic target could directly produce longevity benefits across species.", "question": "Can direct pharmacological activation of a conserved metabolic target extend lifespan across evolutionarily diverse organisms and induce longevity-associated changes in mammals?", "finding": "Direct pharmacological activation of AMPK with compound 991 extends lifespan in Drosophila melanogaster, Caenorhabditis elegans, and Schizosaccharomyces pombe. In mice, 991 induces a proteomic profile associated with pro-longevity biology, supporting the translational potential of AMPK activation.", "key_points": [ "Direct AMPK activation by compound 991", "Lifespan extension in yeast, worms, and flies", "Conserved causal longevity effect across species", "Pro-longevity proteomic response in mice" ], "hypothesis": "Direct pharmacological activation of AMP-activated protein kinase (AMPK) is sufficient to extend adult lifespan in evolutionarily diverse organisms, including nematodes and flies, and improve metabolic resilience in aged mice. Mechanism: Binding to a conserved regulatory site activates AMPK without first causing energy depletion, shifting metabolism toward cellular maintenance. Prediction: A biochemically validated activator increases lifespan in worms and flies and improves insulin sensitivity in aged mice without lowering cellular ATP. These benefits disappear with an AMPK mutation that selectively prevents drug binding while preserving normal kinase function.", "position": 0, "stratum": "unanimous_3", "selected": false, "human_score": 4, "judge_scores": [ 4, 5, 4 ], "judge_median": 4, "weight": 5.533333333333333 }, { "item": "763e2c3a89", "id": "claude-opus-5-5|N|R42725837|3", "task": "R42725837", "generator": "claude-opus-5-5", "background": "Cellular senescence is a stable stress response that contributes to tissue dysfunction, chronic inflammation, and multiple age-related diseases. Senescent cells accumulate with age, and experimentally reducing their abundance or activity can improve health-related outcomes in animal models. Transmembrane proteins can regulate intracellular signaling networks involved in stress responses and cell-fate decisions, but many remain poorly characterized in ageing. Identifying upstream regulators that causally control senescence could reveal therapeutic targets for age-associated disorders.", "question": "Does the transmembrane protein investigated in this study causally regulate cellular senescence and age-related tissue pathology, and through what signaling mechanism?", "finding": "PTCHD4 promotes cellular senescence and age-associated tissue dysfunction by enhancing AKT signaling. PTCHD4 deficiency suppressed senescence, alleviated ageing-related phenotypes and bleomycin-induced pulmonary fibrosis in mice, and its anti-senescent effect was reversed by restoring AKT signaling.", "key_points": [ "PTCHD4 causally promotes cellular senescence", "PTCHD4 deficiency improves ageing-related phenotypes and median lifespan in mice", "PTCHD4 deficiency reduces pulmonary fibrosis and preserves lung function", "AKT activation mediates the pro-senescent effect of PTCHD4" ], "hypothesis": "The protein drives senescence by acting as a co-receptor that amplifies TGF-beta/SMAD signaling, making it a licensing factor for paracrine senescence spread in aged tissue. Mechanism: The protein binds TGF-beta family receptors in the membrane, stabilizing receptor complexes and prolonging SMAD2/3 phosphorylation. Sustained SMAD activity induces p15/p21 and CDKN2B-dependent arrest and amplifies secondary senescence in neighboring cells exposed to TGF-beta from primary senescent cells. Prediction: Conditioned medium from senescent cells induces far less secondary senescence in protein-null recipients, and a TGF-beta receptor kinase inhibitor or SMAD3 deletion fully rescues senescence caused by protein overexpression; proximity-ligation shows protein-receptor association increasing with age.", "position": 3, "stratum": "split_1_2", "selected": false, "human_score": 1, "judge_scores": [ 2, 3, 2 ], "judge_median": 2, "weight": 2.8 }, { "item": "7f7bb3d8b6", "id": "grok-4.5|N|R42842666|1", "task": "R42842666", "generator": "grok-4.5", "background": "Hutchinson-Gilford progeria syndrome is a premature-ageing disorder caused by an LMNA mutation and is characterized by severe, early-onset vascular disease. Its vascular pathology includes extracellular-matrix abnormalities, fibrosis, collagen accumulation and inflammation. Blood-vessel models have often examined individual vascular compartments in isolation, limiting understanding of how interactions among the vessel wall layers produce disease. The cellular origins of the distinct pathological features and the extent to which they depend directly on the causal mutation remained unresolved.", "question": "How do the different cellular compartments of the vascular wall causally contribute to distinct features of Hutchinson-Gilford progeria vascular pathology?", "finding": "In trilayer engineered blood vessels, HGPS fibroblasts causally promoted extracellular-matrix dysregulation and fibrotic signaling, while HGPS smooth muscle cells drove collagen accumulation and endothelial cells drove inflammation. Correcting the HGPS-associated mutation by base editing restored many pathological characteristics toward healthy levels.", "key_points": [ "Trilayer vessels separated cell-specific causal effects", "Fibroblasts drove matrix dysregulation and fibrotic signaling", "Smooth muscle cells promoted collagen accumulation", "Endothelial cells promoted inflammation", "Mutation correction reversed multiple disease features" ], "hypothesis": "Progerin in endothelial cells is the primary driver of vascular wall inflammation in HGPS, through upregulation of leukocyte-adhesion molecules and inflammatory cytokines that recruit immune cells into the vessel wall. Mechanism: Endothelial nuclear envelope dysfunction activates NF-κB and related stress pathways, increasing ICAM-1/VCAM-1 and cytokine release that promote leukocyte extravasation and chronic inflammation. Prediction: Endothelium-restricted progerin will produce inflammatory infiltrates and adhesion-molecule upregulation even when medial and adventitial cells are wild-type, while VSMC-restricted progerin will produce little inflammation without endothelial involvement.", "position": 1, "stratum": "unanimous_3", "selected": false, "human_score": 2, "judge_scores": [ 3, 3, 3 ], "judge_median": 3, "weight": 5.533333333333333 }, { "item": "823869749d", "id": "claude-opus-5-5|N|R42696595|2", "task": "R42696595", "generator": "claude-opus-5-5", "background": "Seeds progressively lose viability during storage, limiting crop propagation and the preservation of genetic resources. Longevity varies substantially among rice varieties and is influenced by both environmental conditions and inherited traits. Although several genomic regions associated with seed longevity had been identified, the causal genes and regulatory mechanisms underlying this variation remained poorly understood. It was also unclear whether naturally occurring longevity alleles could improve seed survival without compromising agronomic performance.", "question": "What genetic and molecular mechanism causes natural variation in seed longevity among rice varieties?", "finding": "Natural variation at qSL6 causally determines rice seed longevity through SL6, a fatty acyl-ACP thioesterase that changes seed fatty-acid composition and increases resistance to oxidation. Desiccation-induced ABA signaling activates SL6 through VP1, while a virus-derived CT-rich element in the 5′ UTR of the ancestral SL6HHZ allele stabilizes its mRNA bidirectionally and contributes to longevity differences between indica and japonica rice.", "key_points": [ "qSL6 encodes the causal fatty acyl-ACP thioesterase SL6", "SL6 alters palmitic-acid synthesis and seed fatty-acid composition", "The ABA–VP1 module directly activates SL6 during seed desiccation", "A CT-rich 5′-UTR element stabilizes SL6HHZ mRNA", "Increasing SL6 expression improves seed longevity without major agronomic penalties" ], "hypothesis": "Seed longevity variation is controlled by a transcription factor of the seed-maturation network, such as a HSFA9/ABI3-DOG1-like regulator. Variation in its expression or activity determines how much heat-shock protein, LEA protein and raffinose-family oligosaccharide (RFO) the seed accumulates during late maturation. Mechanism: Stronger late-maturation activity of this regulator induces sHSPs, LEAs and RFO/galactinol synthesis. These stabilize the intracellular glassy state and protect macromolecules in the dry seed. The effect depends on ABA but can be separated from dormancy. Prediction: The long-lived allele raises sHSP, LEA and RFO transcripts and metabolites in mature seeds and raises the cytoplasmic glass-transition temperature. Mutating the regulator, or its downstream RFO synthase, eliminates the longevity gain. Dormancy and field performance can stay unchanged if the allele acts on the protective arm specifically.", "position": 2, "stratum": "unanimous_0", "selected": false, "human_score": 2, "judge_scores": [ 2, 2, 2 ], "judge_median": 2, "weight": 51.0 }, { "item": "82799aa60e", "id": "gemini-4-argon-high|N|R42664348|3", "task": "R42664348", "generator": "gemini-4-argon-high", "background": "Osteoarthritis is a common age-related disorder characterized by progressive joint deterioration, inflammation, pain, and loss of mobility. Obesity substantially increases osteoarthritis risk, including in joints that do not bear additional body weight, suggesting that mechanical loading alone cannot explain the association. Adipose tissue can influence distant organs through circulating signals, but the molecular basis of its contribution to joint degeneration remained unclear. Identifying the responsible signals and downstream processes could reveal targets for preventing or treating obesity-associated osteoarthritis.", "question": "By what causal molecular mechanism does excess adiposity promote osteoarthritis progression, and can disrupting that mechanism reduce joint pathology?", "finding": "Adipocyte-derived extracellular vesicles enriched in mitochondrial components transfer mitochondrial DNA to chondrocytes, where it activates cGAS-STING signaling and causes inflammation, metabolic dysfunction, senescence, and cartilage degeneration. Genetic or pharmacological inhibition of this pathway attenuates cartilage damage, pain behaviors, and gait abnormalities.", "key_points": [ "Adipocyte-derived EV-Mito carry mitochondrial DNA", "Mitochondrial DNA is transferred to chondrocytes", "Transferred DNA activates cGAS-STING signaling", "The pathway drives senescence and cartilage degeneration", "cGAS-STING inhibition reduces osteoarthritis pathology" ], "hypothesis": "Excess adipose tissue promotes osteoarthritis progression by secreting complement factor D (adipsin) into the circulation, which acts as the rate-limiting protease to activate the alternative complement cascade within synovial fluid and drive complement-mediated joint injury. Genetic deletion or pharmacological inhibition of circulating adipsin will protect against obesity-induced cartilage degeneration and synovitis. Mechanism: Adipocytes serve as the primary endocrine source of circulating adipsin (CFD), which diffuses into the joint space and cleaves factor B complexed with C3b to form the alternative pathway C3 convertase (C3bBb); subsequent cascade amplification generates C3a/C5a anaphylatoxins and deposits sublytic membrane attack complexes (C5b-9) on chondrocytes and synovial macrophages, activating C5aR1 and MAPK/ERK signaling to induce catabolic metalloproteinases and synovial inflammation. Prediction: Cfd-deficient mice or lipodystrophic mice fed an obesogenic diet will be protected from synovial C3b/C5b-9 deposition and osteoarthritis, and surgical transplantation of wild-type—but not Cfd-knockout—adipose tissue into fat-free mice will restore synovial alternative complement activation and susceptibility to joint degeneration.", "position": 3, "stratum": "selected", "selected": true, "human_score": 1, "judge_scores": [ 2, 2, 0 ], "judge_median": 2, "weight": 2.0 }, { "item": "83a1100d9d", "id": "gpt-6-astra|N|R42842666|0", "task": "R42842666", "generator": "gpt-6-astra", "background": "Hutchinson-Gilford progeria syndrome is a premature-ageing disorder caused by an LMNA mutation and is characterized by severe, early-onset vascular disease. Its vascular pathology includes extracellular-matrix abnormalities, fibrosis, collagen accumulation and inflammation. Blood-vessel models have often examined individual vascular compartments in isolation, limiting understanding of how interactions among the vessel wall layers produce disease. The cellular origins of the distinct pathological features and the extent to which they depend directly on the causal mutation remained unresolved.", "question": "How do the different cellular compartments of the vascular wall causally contribute to distinct features of Hutchinson-Gilford progeria vascular pathology?", "finding": "In trilayer engineered blood vessels, HGPS fibroblasts causally promoted extracellular-matrix dysregulation and fibrotic signaling, while HGPS smooth muscle cells drove collagen accumulation and endothelial cells drove inflammation. Correcting the HGPS-associated mutation by base editing restored many pathological characteristics toward healthy levels.", "key_points": [ "Trilayer vessels separated cell-specific causal effects", "Fibroblasts drove matrix dysregulation and fibrotic signaling", "Smooth muscle cells promoted collagen accumulation", "Endothelial cells promoted inflammation", "Mutation correction reversed multiple disease features" ], "hypothesis": "Progerin expression in medial vascular smooth-muscle cells directly causes elastic-matrix disorganization and medial cell loss, independently of mutations in the other vessel-wall compartments. Mechanism: Progerin-induced nuclear fragility impairs smooth-muscle-cell survival and elastic-matrix maintenance under pulsatile mechanical stress. Prediction: In layered vessels with independently controlled compartment genotypes, mutant smooth-muscle cells produce medial cell loss and elastic-matrix defects despite wild-type endothelium and adventitial fibroblasts. Smooth-muscle-specific LMNA correction rescues these defects under matched pressure and flow.", "position": 0, "stratum": "split_1_2", "selected": false, "human_score": 2, "judge_scores": [ 2, 3, 2 ], "judge_median": 2, "weight": 2.8 }, { "item": "84f4faa02b", "id": "claude-opus-5-5|N|R42759510|4", "task": "R42759510", "generator": "claude-opus-5-5", "background": "Women show a disproportionate increase in cognitive and systemic vulnerability during midlife despite their longer average lifespan. Ageing is accompanied by mitochondrial dysfunction, cellular senescence, and altered communication between peripheral tissues and the brain. Circulating regulatory signals can influence brain physiology, but the mechanisms responsible for the female-biased transition from resilience to vulnerability remain poorly understood. It was also unclear whether this transition is reversible or contributes causally to age-related neurodegenerative phenotypes.", "question": "What molecular mechanism drives peripheral-to-brain signaling that promotes senescence, mitochondrial dysfunction, and cognitive vulnerability during female midlife?", "finding": "Epigenetic upregulation of splenic RBMX in middle-aged female mice increases peripheral miR-10a-5p, which contributes to cerebral miR-10a-5p abundance and represses γCaMKII. Manipulating this RBMX–miR-10a-5p–γCaMKII axis alters mitochondrial function, cellular senescence, and memory, while miR-10a-5p inhibition alleviates Alzheimer’s-associated phenotypes in patient-derived neurons and model mice.", "key_points": [ "Female midlife induces epigenetic RBMX upregulation in the spleen", "RBMX promotes increased splenic miR-10a-5p", "Peripheral signaling contributes to brain miR-10a-5p abundance", "miR-10a-5p represses γCaMKII and drives mitochondrial, senescence, and memory phenotypes", "miR-10a-5p inhibition attenuates Alzheimer’s-associated phenotypes" ], "hypothesis": "Perimenopausal loss of oestrogen-dependent gut barrier and microbial regulation permits microbial-product leak (LPS, imidazole propionate, reduced SCFA) that primes hepatic acute-phase output; the resulting peripheral innate-immune tone, not an ovarian signal per se, drives brain senescence and cognitive vulnerability in females. Mechanism: ERβ-dependent mucin and tight-junction maintenance fails, raising portal LPS. Hepatic TLR4–NF-κB output (IL-6, CRP, serum amyloid A) plus loss of butyrate-dependent HDAC inhibition activates brain-border macrophages and microglia, inducing NLRP3 and mitochondrial ROS; microglial senescence then degrades synaptic pruning and tau/amyloid clearance. Prediction: Germ-free or antibiotic-depleted ovariectomised females, or those given butyrate or TLR4 blockade, retain microglial mitochondrial function and memory despite full oestradiol loss; faecal transfer from perimenopausal females into young germ-free females transmits brain senescence markers, and the transfer fails with LPS-nonresponsive (Tlr4-null) recipients.", "position": 4, "stratum": "unanimous_0", "selected": false, "human_score": 1, "judge_scores": [ 1, 2, 1 ], "judge_median": 1, "weight": 51.0 }, { "item": "8605453a05", "id": "claude-opus-5-5|N|R42805954|0", "task": "R42805954", "generator": "claude-opus-5-5", "background": "Ageing is associated with declining thermogenic capacity in adipose tissue, impaired energy expenditure, and increased susceptibility to metabolic dysfunction. Subcutaneous white adipose tissue can acquire heat-producing adipocytes in response to environmental stimuli, but this capacity diminishes with age. Communication between the nervous system and adipose tissue helps regulate this adaptive response. The mechanisms responsible for its age-related deterioration remained incompletely understood.", "question": "What causal mechanism contributes to the age-related decline of thermogenic adipocytes in subcutaneous white adipose tissue?", "finding": "Microglial ALKBH5 suppresses Ntf5 expression by demethylating Ntf5 mRNA, thereby limiting activation of PVH TrkB-positive neurons, sympathetic innervation of subcutaneous white adipose tissue, and adipocyte browning. Microglia-specific ALKBH5 knockout preserved brown adipocytes and improved metabolic activity during ageing in male mice.", "key_points": [ "Microglial ALKBH5 restrains adipocyte browning", "ALKBH5 knockout increases Ntf5 mRNA m6A methylation and Ntf5 expression", "Ntf5 activates PVH TrkB-positive neurons and downstream sympathetic innervation", "Microglia-specific ALKBH5 loss prevents age-related brown adipocyte decline", "The causal findings were demonstrated in male mice" ], "hypothesis": "Age-related loss of thermogenic adipocytes in subcutaneous white adipose tissue (scWAT) is caused by a progressive die-back of sympathetic nerve terminals, which itself is driven by the loss of adipocyte-derived neurotrophic support. As adipocytes age they downregulate secreted neurotrophic/neuritogenic factors (e.g. NRG4, BDNF, S100B), the local axonal arbor retracts, and the noradrenergic signal needed to recruit beige adipocytes never reaches the progenitor niche. Mechanism: Reduced adipocyte-to-axon trophic signalling → retraction/pruning of tyrosine-hydroxylase-positive terminals and reduced terminal density per adipocyte → lower local norepinephrine delivery → failure of β3-adrenergic→cAMP→PKA→p38→PGC-1α/UCP1 induction after cold or β3-agonist challenge. The adipocyte defect is upstream; the neuron is the proximate executor. Prediction: In aged mice, whole-mount TH imaging shows reduced sympathetic arbor density in scWAT that precedes the fall in UCP1+ adipocytes, and aged scWAT is refractory to cold but still responds normally to a cell-autonomous bypass of the nerve (direct β3-agonist, forskolin, or dibutyryl-cAMP ex vivo). Adipocyte-specific restoration of the neurotrophic factor in old mice re-grows the arbor and restores cold-induced beiging; adipocyte-specific deletion in young mice phenocopies the aged arbor and the beiging defect. Denervation-independent interventions should not rescue if nerve loss is the sole lesion — so the discriminating result is rescue by re-innervation without any change in adipocyte β3 receptor levels.", "position": 0, "stratum": "split_2_1", "selected": false, "human_score": 2, "judge_scores": [ 3, 3, 2 ], "judge_median": 3, "weight": 1.8 }, { "item": "87cdcef872", "id": "gemini-4-argon-high|N|R42581103|1", "task": "R42581103", "generator": "gemini-4-argon-high", "background": "Intestinal stem-cell function and regenerative capacity decline with age, compromising maintenance and repair of the intestinal epithelium. Both cell-intrinsic changes and signals from the aged systemic environment may contribute to this decline. Chronic inflammation and altered cellular metabolism are common features of ageing, but how circulating conditions are translated into functional defects in intestinal regeneration was unresolved. It was also unclear whether manipulating systemic or metabolic processes could preserve or restore aged stem-cell activity.", "question": "How does the aged systemic environment causally impair intestinal stem-cell metabolism and regenerative function?", "finding": "Age-associated TNF acts as a systemic pro-ageing factor that signals through epithelial TNFR1 to suppress mitochondrial fatty acid oxidation, proliferation and regenerative capacity in intestinal stem cells. Blocking inflammation or TNF–TNFR1 signaling protects or restores ISC function, while enhancing mitochondrial fusion improves the function of aged ISCs.", "key_points": [ "The old systemic environment transfers an ISC ageing phenotype to young mice.", "TNF is a causal pro-ageing inflammatory factor.", "Epithelial TNFR1 is required for the detrimental systemic effect.", "TNF suppresses mitochondrial pathways and fatty acid oxidation.", "Countering inflammation or improving mitochondrial function restores ISC activity." ], "hypothesis": "Age-associated circulating senescent-associated secretory phenotype (SASP) factors and endotoxins induce ectopic upregulation of the NAD+-consuming ectozyme CD38 across the pericryptal vascular niche and intestinal epithelium, systematically depleting intracellular NAD+ in Lgr5+ ISCs and crippling sirtuin-dependent mitochondrial quality control. Pharmacological inhibition of systemic CD38 activity or restoration of circulating NAD+ precursors reverses mitochondrial dysfunction and rescues aged intestinal regeneration. Mechanism: Circulating IL-6, TNF-alpha, and microbial lipopolysaccharide (LPS) from the aged systemic milieu stimulate CD38 expression on lamina propria macrophages, pericryptal endothelial cells, and crypt progenitor cells, accelerating extracellular and intracellular degradation of NAD+ and nicotinamide mononucleotide (NMN). The resulting fall in the ISC NAD+/NADH ratio inactivates SIRT1 and SIRT3, leading to hyperacetylation and inhibition of PGC-1alpha and mitochondrial complex I/II subunits, defective mitophagy, accumulation of dysfunctional mitochondria, and failure to meet the bioenergetic demands of regenerative proliferation. Prediction: Heterochronic parabiosis or aged plasma infusion into young mice will elevate crypt CD38 enzymatic activity and reduce Lgr5+ ISC NAD+ levels and mitochondrial membrane potential, whereas systemic treatment of aged mice with a selective CD38 inhibitor (such as 78c) or nicotinamide riboside (NR) will restore ISC SIRT1/SIRT3 deacetylase activity, normalize mitochondrial respiration, and rescue crypt regeneration even in the continued presence of elevated circulating inflammatory cytokines.", "position": 1, "stratum": "unanimous_0", "selected": false, "human_score": 2, "judge_scores": [ 2, 2, 2 ], "judge_median": 2, "weight": 51.0 }, { "item": "8991668918", "id": "gemini-4-argon-high|N|R42811497|3", "task": "R42811497", "generator": "gemini-4-argon-high", "background": "Localized scleroderma is characterized by excessive extracellular-matrix deposition and progressive skin fibrosis. Cellular senescence can promote persistent tissue remodeling and fibrotic disease through altered cell function and inflammatory signaling. Disturbances in organelle homeostasis have also been associated with both senescence and fibrosis. The causal molecular mechanisms connecting these processes in localized scleroderma, and whether they can be therapeutically reversed, remained incompletely understood.", "question": "What molecular mechanism drives cellular senescence and fibrosis in localized scleroderma, and can pharmacological disruption of that mechanism alleviate the disease phenotype?", "finding": "Parthenolide suppresses Ero1L, thereby normalizing Ero1L-mediated mitochondria-associated endoplasmic reticulum membrane function, regulating the IP3R1/Grp75/VDAC1 complex, and reducing mitochondrial damage, cellular senescence, and fibrosis. Ero1L overexpression reverses these protective effects, whereas Ero1L knockdown reproduces the anti-senescent and antifibrotic phenotype; ARG-449 is critical for parthenolide binding to Ero1L.", "key_points": [ "Ero1L causally promotes senescence and fibrosis", "Parthenolide directly suppresses Ero1L through binding involving ARG-449", "The mechanism involves MAM stabilization and the IP3R1/Grp75/VDAC1 complex", "Ero1L gain- and loss-of-function experiments establish causality", "Targeting this axis reduces mitochondrial damage and fibrotic pathology" ], "hypothesis": "Pathological tethering of mitochondria-associated ER membranes (MAMs) via the IP3R-GRP75-VDAC1-MCU complex drives mitochondrial calcium overload, bioenergetic collapse, and premature senescence in localized scleroderma fibroblasts. Pharmacological disruption of ER-mitochondria calcium transfer prevents fibroblast senescence and ameliorates dermal fibrosis. Mechanism: Upregulation of MAM tethering proteins (PACS2, Mitofusin-2, and the IP3R-GRP75-VDAC1 bridge) in lesional fibroblasts increases physical apposition between the ER and mitochondria, channeling excessive Ca2+ from the ER lumen into the mitochondrial matrix via the mitochondrial calcium uniporter (MCU). Matrix Ca2+ overload induces mitochondrial permeability transition pore (mPTP) opening, cristae remodeling, and bursts of superoxide that cause telomeric and genomic DNA damage response (DDR) activation (γH2AX-ATM-p53-p21), driving senescence and TGF-β-dependent fibrogenesis. Pharmacological inhibition of MCU (Ru360), VDAC1 oligomerization (VBIT-4), or IP3R (2-APB) uncouples inter-organelle Ca2+ flux and halts senescence-driven fibrosis. Prediction: High-resolution imaging and proximity ligation assays in localized scleroderma fibroblasts will reveal increased IP3R-VDAC1 contact sites and elevated mitochondrial matrix Ca2+ preceding senescence onset, and selective inhibition of MCU or VDAC1 will prevent mtROS generation, DDR activation, and dermal thickening.", "position": 3, "stratum": "unanimous_3", "selected": false, "human_score": 3, "judge_scores": [ 3, 3, 4 ], "judge_median": 3, "weight": 5.533333333333333 }, { "item": "8e23aecc1c", "id": "gemini-4-argon-high|N|R42858183|1", "task": "R42858183", "generator": "gemini-4-argon-high", "background": "Aging is accompanied by declining lysosomal activity, impaired autophagic clearance, and loss of protein homeostasis. These changes contribute to progressive functional deterioration and increase vulnerability to protein-aggregation disorders. Restoring cellular clearance systems can sometimes improve lifespan or healthspan in model organisms. However, interventions that preserve lysosomal competence during aging and the mechanisms through which they act remain incompletely understood.", "question": "Can a defined intervention preserve lysosomal function and protein homeostasis during aging, thereby extending lifespan and maintaining organismal function, and through what mechanism?", "finding": "20(S)-ginsenoside Rg3 extended lifespan and preserved physiological and neuronal function in Caenorhabditis elegans by restoring lysosomal activity and autophagic flux. Rg3 remodeled neuronal lysosomal phosphoinositide signatures toward increased PI(4)P and reduced PI(3)P, suppressed RSKS-1/S6K–TORC1 signaling, and promoted nuclear HLH-30/TFEB activity, thereby improving proteostasis and resistance to polyglutamine- and α-synuclein-associated toxicity.", "key_points": [ "Rg3 extends lifespan and preserves healthspan", "Lysosomal function and autophagic flux are restored during aging", "Neuronal phosphoinositides shift toward higher PI(4)P and lower PI(3)P", "TORC1–RSKS-1/S6K signaling is suppressed and HLH-30/TFEB enters the nucleus", "Protein aggregation and neurodegeneration are reduced" ], "hypothesis": "Pharmacological inhibition of mTORC1 or activation of the endolysosomal TRPML1 calcium channel preserves lysosomal proteolytic competence and extends healthspan and lifespan by directly driving the reversible assembly of the vacuolar H+-ATPase (V-ATPase) V1-V0 holoenzyme at the lysosomal membrane. Mechanism: During aging, chronic nutrient signaling and dysregulated endolysosomal phosphoinositide dynamics promote the dissociation of the cytosolic catalytic V1 sector from the membrane-embedded proton-translocating V0 sector. Targeted mTORC1 inhibition or TRPML1-mediated local calcium release recruits the RAVE/DMXL1 assembly complex and the chaperonin TRiC/CCT to promote V1-V0 docking, re-establishing the lumenal proton gradient required for acid hydrolase maturation and autolysosomal cargo degradation independent of de novo lysosomal biogenesis. Prediction: In aged tissues, the intervention will rapidly increase the membrane-to-cytosol ratio of V1 subunits and restore lumenal acidity (pH < 4.8) prior to any change in total lysosomal mass or LAMP1 abundance, and knocking down the V-ATPase assembly factor DMXL1/rabconnectin-3 or applying sub-lethal doses of bafilomycin A1 will selectively abrogate proteostasis and lifespan extension despite intact TFEB transcriptional activity.", "position": 1, "stratum": "split_1_2", "selected": false, "human_score": 2, "judge_scores": [ 3, 2, 2 ], "judge_median": 2, "weight": 2.8 }, { "item": "8e65d4019e", "id": "gemini-4-argon-high|N|R42647635|3", "task": "R42647635", "generator": "gemini-4-argon-high", "background": "Ageing is accompanied by progressive molecular damage, impaired tissue maintenance, and declining physiological function. Genetic studies in laboratory organisms have identified processes that can influence lifespan and cellular senescence. However, findings from small-animal models do not always translate directly to humans because of major differences in physiology, metabolism, and lifespan. A large-mammal model is therefore valuable for testing whether a proposed source of molecular damage can directly produce systemic ageing phenotypes.", "question": "Does experimentally increasing somatic mitochondrial DNA mutation burden cause premature ageing and shortened lifespan in a large mammal?", "finding": "Prime-edited pigs expressing proofreading-deficient POLG accumulated elevated somatic mitochondrial DNA mutations and developed systemic premature-ageing phenotypes. These included weight loss, rough hair, anaemia, tissue abnormalities, increased apoptosis, elevated senescence-associated markers, and shortened lifespan.", "key_points": [ "Proofreading-deficient POLG", "Increased somatic mitochondrial DNA mutations", "Systemic premature-ageing phenotypes", "Increased apoptosis and senescence markers", "Shortened lifespan" ], "hypothesis": "Experimentally elevating somatic mtDNA point mutation rates does not cause systemic premature ageing or shortened lifespan in large mammals unless large-scale mtDNA deletions are simultaneously generated in post-mitotic tissues. Point mutations alone produce only mild, tissue-restricted pathology due to the slower cell turnover and greater metabolic reserve of large mammals. Mechanism: In long-lived large mammals with low basal metabolic rates, random somatic mtDNA point mutations fail to clonally expand to the high heteroplasmic threshold (>60-80%) required for phenotypic expression in post-mitotic organs like brain, heart, and skeletal muscle, whereas large-scale segmental mtDNA deletions possess a replicative size advantage that allows rapid clonal expansion and focal cytochrome c oxidase (COX) deficiency. Prediction: Large mammals carrying a proofreading-deficient POLG variant (which predominantly generates point mutations and non-replicating linear fragments) will maintain a near-normal lifespan with minimal post-mitotic organ failure, whereas large mammals expressing a dominant-negative Twinkle helicase or mitochondrial-targeted restriction endonuclease (which generates circular mtDNA deletions) will develop severe cardiomyopathy, neurodegeneration, and shortened lifespan.", "position": 3, "stratum": "unanimous_0", "selected": false, "human_score": 0, "judge_scores": [ 0, 0, 0 ], "judge_median": 0, "weight": 51.0 }, { "item": "8e95ce1bc6", "id": "claude-opus-5-5|N|R42736449|0", "task": "R42736449", "generator": "claude-opus-5-5", "background": "Alzheimer's disease involves progressive neuronal dysfunction accompanied by broad molecular changes in the brain. Conventional genome annotation does not capture every translated product, leaving potentially functional proteins uncharacterized. Disease-associated changes in these overlooked products may occur independently of established proteins encoded at the same genomic loci. It remained unclear whether any such product contributes directly to cellular dysfunction in Alzheimer's disease.", "question": "Can an unannotated protein product that is altered in Alzheimer's disease causally regulate cellular function relevant to disease pathology?", "finding": "A small open reading frame at the MKKS locus encodes a 63-amino-acid microprotein that is the locus's predominant translation product and is downregulated in Alzheimer's disease. Experimental loss of this microprotein impairs mitochondrial respiration in microglia, supporting a causal role in microglial bioenergetics.", "key_points": [ "63-amino-acid microprotein encoded at the MKKS locus", "Predominant translation product of the locus", "Downregulated in Alzheimer's disease", "Its loss impairs microglial mitochondrial respiration" ], "hypothesis": "A microprotein translated from a small ORF within a lncRNA or 5' uORF is depleted in Alzheimer's disease neurons, and this loss causally impairs mitochondrial respiration independently of any annotated protein at the same locus. Mechanism: The microprotein localizes to the inner mitochondrial membrane and stabilizes assembly of respiratory complex I/IV or ATP synthase dimers. Depletion lowers ATP output and raises mitochondrial ROS, which degrades synaptic maintenance in high-demand neurons. Prediction: CRISPR knockout of only the sORF start codon (leaving the host transcript and any overlapping annotated ORF intact) reduces oxygen consumption rate and complex activity in neurons, and re-expression of the microprotein cDNA from a separate locus rescues it; knockdown of the host lncRNA by itself does not reproduce the defect.", "position": 0, "stratum": "selected", "selected": true, "human_score": 3, "judge_scores": [ 3, 3, 3 ], "judge_median": 3, "weight": 2.0 }, { "item": "92c04052e7", "id": "grok-4.5|N|R42689491|2", "task": "R42689491", "generator": "grok-4.5", "background": "Hutchinson-Gilford progeria syndrome is a rare genetic disorder characterized by accelerated, multisystem features of ageing. Progressive skeletal abnormalities are a prominent component of the disease in both patients and experimental models. These abnormalities involve impaired bone formation, remodeling, and mechanical integrity. It remained unclear whether established skeletal pathology could be meaningfully reversed in vivo and how strongly therapeutic efficacy would depend on the age at treatment.", "question": "Can in vivo correction of the HGPS-causing mutation rescue molecular, cellular, and structural defects in bone, and how does treatment timing affect efficacy?", "finding": "Adenine base editing of the pathogenic LMNA variant reduced progerin expression, restored extracellular-matrix deposition and mineralization in progeroid osteoblasts, and partially rescued bone structure and physical properties in mice. In vivo correction was strongly age-dependent, with early postnatal delivery producing substantially greater editing and skeletal benefit than later treatment.", "key_points": [ "Correction of the pathogenic LMNA variant", "Reduced progerin transcripts and protein", "Improved osteoblast matrix deposition and mineralization", "Partial rescue of bone structure and physical properties", "Greater efficacy with early postnatal treatment" ], "hypothesis": "Therapeutic efficacy of mutation correction on bone depends on cell-autonomous rescue of osteoblasts and osteocytes, with little contribution from corrected hematopoietic or vascular compartments. Mechanism: Progerin in osteolineage cells directly causes defective matrix secretion, impaired mechanotransduction, and osteocyte senescence; correcting only those cells restores formation and integrity even if other tissues retain mutant alleles. Prediction: Lineage-restricted correction in osteoprogenitors rescues molecular, cellular, and structural bone phenotypes to a similar degree as ubiquitous correction, whereas correction confined to hematopoietic or endothelial cells yields negligible skeletal improvement.", "position": 2, "stratum": "split_2_1", "selected": false, "human_score": 3, "judge_scores": [ 3, 2, 3 ], "judge_median": 3, "weight": 1.8 }, { "item": "92f0349883", "id": "claude-opus-5-5|N|R42821663|4", "task": "R42821663", "generator": "claude-opus-5-5", "background": "Osteoarthritis is a common degenerative disease whose incidence and severity increase with age. Mechanical damage and age-associated changes in joint tissues create susceptibility to progressive cartilage loss. Systemic metabolic disorders, including hypertension, have been associated with greater osteoarthritis risk and severity. However, it was unclear whether elevated blood pressure actively promotes joint degeneration through a defined biological mechanism rather than merely sharing risk factors with osteoarthritis.", "question": "Through what causal mechanism does hypertension accelerate osteoarthritis in joints predisposed by aging or mechanical injury?", "finding": "Hypertension-associated circulating arginine vasopressin activates up-regulated AVPR1A in osteoarthritis-primed chondrocytes, driving NR4A3-dependent catabolic signaling and suppressing anabolic regulation. Genetic deletion or pharmacological inhibition of AVPR1A prevents the hypertension-induced acceleration of osteoarthritis.", "key_points": [ "Hypertension elevates osteoarthritis progression", "OA-primed chondrocytes up-regulate AVPR1A", "Circulating AVP activates AVPR1A", "NR4A3 mediates the downstream catabolic program", "AVPR1A disruption protects cartilage" ], "hypothesis": "Hypertension disrupts the normal recovery of joint blood flow after mechanical loading. Repeated ischaemia and reperfusion then cause oxidative and endothelin-1 driven damage to the cartilage and to the tissue at the cartilage-bone junction. These effects add to the damage from aging and injury. Mechanism: Two hypertension-related changes reduce subchondral perfusion: endothelial nitric oxide synthase (eNOS) is uncoupled, and endothelin-1 and ET-A receptor signalling increase. When a loaded joint is unloaded, this produces bursts of ischaemia followed by reperfusion. The mitochondria of chondrocytes and osteocytes release ROS, which cause lipid peroxidation, ferroptosis-like chondrocyte death and calcification of the tidemark (the boundary between cartilage and calcified cartilage). Prediction: Blocking ET-A receptors (ambrisentan) or restoring eNOS coupling (tetrahydrobiopterin, BH4) should rescue subchondral perfusion and prevent the extra osteoarthritis in hypertensive DMM mice without normalising blood pressure. The cartilage should show less lipid peroxidation (4-HNE) and less evidence of ferroptosis (lower GPX4 loss and less cell death).", "position": 4, "stratum": "unanimous_0", "selected": false, "human_score": 1, "judge_scores": [ 2, 2, 1 ], "judge_median": 2, "weight": 51.0 }, { "item": "947c39c586", "id": "gpt-6-astra|N|R42608398|0", "task": "R42608398", "generator": "gpt-6-astra", "background": "Idiopathic pulmonary fibrosis is a progressive, age-associated disorder characterized by recurring tissue injury and excessive fibrotic remodeling. Abnormal cell-fate programs, including apoptosis, senescence, and phenotypic transitions, are thought to contribute to disease progression. Changes in the lung microbiota have also been associated with disease severity, but association alone has not established a direct pathogenic mechanism. It remained unclear whether a microbiota-derived product could independently initiate the cellular dysfunction and progressive fibrosis observed in this disease.", "question": "Can a microbiota-derived factor directly cause the cellular dysfunction and progressive tissue remodeling characteristic of idiopathic pulmonary fibrosis, and if so, through what mechanism?", "finding": "The microbiota-derived peptide corisin directly disrupts epithelial proteostasis by targeting and enhancing the ubiquitin-proteasome system, thereby inducing apoptosis, cellular senescence, epithelial-mesenchymal transition, and fibrotic remodeling. Depleting native corisin from patient bronchoalveolar lavage fluid removes its proapoptotic activity, while constitutive corisin expression in mice causes spontaneous progressive pulmonary fibrosis and worsens bleomycin-induced injury and mortality.", "key_points": [ "Corisin is present and functionally active in bronchoalveolar lavage fluid from patients with idiopathic pulmonary fibrosis.", "Corisin enters epithelial cells, localizes to mitochondria, and induces apoptosis, senescence, and epithelial-mesenchymal transition.", "Corisin enhances proteasome activity and disrupts epithelial proteostasis.", "Removing corisin abolishes the proapoptotic activity of patient lavage fluid.", "Native corisin expression is sufficient to cause progressive pulmonary fibrosis in mice." ], "hypothesis": "A microbiota-derived proapoptotic peptide, such as corisin, initiates pulmonary fibrosis by repeatedly killing alveolar type II epithelial cells. Sustained peptide exposure causes epithelial loss faster than regenerative replacement. Mechanism: The peptide activates mitochondrial apoptosis in alveolar type II cells, compromising alveolar repair and promoting profibrotic signaling that activates fibroblasts and increases extracellular matrix deposition. Prediction: Purified peptide at concentrations measured in diseased lungs induces epithelial apoptosis before progressive collagen accumulation in microbiota-free experimental models. Peptide neutralization or epithelial-specific inhibition of mitochondrial apoptosis prevents both effects despite equivalent exposure.", "position": 0, "stratum": "unanimous_3", "selected": false, "human_score": 3, "judge_scores": [ 3, 4, 3 ], "judge_median": 3, "weight": 5.533333333333333 }, { "item": "957d5dd679", "id": "gpt-6-astra|N|R42826184|4", "task": "R42826184", "generator": "gpt-6-astra", "background": "Three-dimensional genome organization helps regulate transcription by partitioning chromosomes into domains and controlling contacts between regulatory elements and gene promoters. Ageing is accompanied by widespread transcriptional dysregulation, including chronic inflammation and impaired immune function. Changes in chromatin structure have been observed during ageing, but whether they actively drive age-related gene-expression programs rather than merely accompany them has remained unclear. The molecular mechanisms connecting altered genome topology to physiological decline are also poorly understood.", "question": "What causal molecular mechanism remodels three-dimensional genome organization during ageing and thereby promotes age-associated inflammatory and activation-related transcription?", "finding": "Age-associated reduction of SATB1 in naive CD4+ T cells weakens TAD boundaries and expands the range of CTCF-mediated interactions without changing CTCF occupancy, producing enhancer-promoter rewiring and increased expression of proinflammatory and proactivation genes. Conditional SATB1 deletion recapitulates these ageing-associated architectural and transcriptional changes, establishing SATB1 deficiency as a causal contributor.", "key_points": [ "SATB1 expression declines with age", "SATB1 normally constrains CTCF-mediated chromatin interactions", "SATB1 loss weakens TAD boundaries and rewires enhancer-promoter contacts", "Architectural remodeling activates inflammatory and T-cell activation genes", "Conditional SATB1 deletion phenocopies ageing" ], "hypothesis": "Age-associated depletion of chromatin-bound HMGB2 removes local insulation around inflammatory and activation-related gene clusters. This permits architectural reorganization that makes these loci persistently accessible to activating enhancers. Mechanism: Loss of HMGB2-mediated DNA bending and boundary organization changes local CTCF positioning and clustering, merging regulatory neighborhoods that were previously separated. Prediction: Acute HMGB2 depletion in young cells should reproduce the specific boundary and contact changes observed in aged cells before inflammatory expression increases. Restoring chromatin-binding-competent HMGB2 should rescue both architecture and transcription, whereas a DNA-binding-defective mutant should not.", "position": 4, "stratum": "split_1_2", "selected": false, "human_score": 3, "judge_scores": [ 2, 3, 2 ], "judge_median": 2, "weight": 2.8 }, { "item": "9acb86f544", "id": "grok-4.5|N|R42748238|1", "task": "R42748238", "generator": "grok-4.5", "background": "Microvascular function declines with age, impairing tissue perfusion, nutrient delivery, and waste clearance. Vascular deterioration is associated with dysfunction across multiple organs and with increased frailty and mortality. Cellular senescence and altered metabolic homeostasis are recognized contributors to age-related tissue decline. However, the molecular mechanism by which vascular aging can drive organism-wide aging and shorten lifespan remained unclear.", "question": "What molecular mechanism causes age-related vascular deterioration to promote systemic senescence and shorten lifespan?", "finding": "Progressive activation of endothelial C/EBPβ induces AEP, which cleaves NAMPT and thereby causes systemic NAD+ depletion, vascular dysfunction, senescence, and reduced lifespan. Genetic disruption of AEP or expression of cleavage-resistant NAMPT N136A ameliorates these effects, while AEP inhibition or NMN supplementation alleviates age-related vascular decline.", "key_points": [ "Endothelial C/EBPβ activates AEP during aging", "AEP cleaves the NAD+ biosynthetic enzyme NAMPT", "NAMPT cleavage causes systemic NAD+ depletion and senescence", "The pathway drives vascular dysfunction and lifespan reduction", "Blocking AEP or preventing NAMPT cleavage rescues the phenotype" ], "hypothesis": "Vascular aging shortens lifespan by upregulating endothelial CD38, which depletes circulating NAD+ and NAD precursors and thereby impairs SIRT1/SIRT3 activity across organs. Restoring systemic NAD+ or endothelium-specific CD38 inhibition should reverse organism-wide senescence downstream of vascular decline. Mechanism: Aged endothelium ↑CD38 → systemic NAD+ exhaustion → loss of sirtuin-dependent proteostasis and mitochondrial quality control Prediction: Plasma NAD+/NMN falls with endothelial CD38 induction; endothelium-specific Cd38 deletion raises NAD+ in muscle, liver, and brain and extends lifespan more than tissue-specific Cd38 deletion outside endothelium, with little change in circulating IL-6.", "position": 1, "stratum": "split_2_1", "selected": false, "human_score": 3, "judge_scores": [ 3, 3, 2 ], "judge_median": 3, "weight": 1.8 }, { "item": "9b359d5ed4", "id": "grok-4.5|N|R42822442|2", "task": "R42822442", "generator": "grok-4.5", "background": "Solid tumors create metabolically stressful microenvironments in which rapidly proliferating malignant and immune cells compete for limited nutrients. Adoptively transferred immune cells often lose function and fail to persist under these conditions, limiting therapeutic efficacy. Cellular senescence can produce durable functional decline in immune cells, but the metabolic signals that initiate this state within tumors have remained incompletely understood. Identifying the causal signaling events could reveal ways to preserve therapeutic immune-cell activity.", "question": "How does nutrient scarcity in the solid-tumor microenvironment cause senescence and loss of persistence in adoptively transferred antitumor immune cells?", "finding": "Glucose deprivation activates AMPK in transferred Th9 cells, initiating a ZAK–NIK cascade that suppresses noncanonical NF-κB signaling and IL-9 production, thereby driving cellular senescence. Restoring glucose or targeting ZAK reduces senescence, improves Th9-cell persistence, and enhances CAR-Th9 efficacy against solid tumors.", "key_points": [ "Glucose deprivation causes Th9-cell senescence", "AMPK is activated by glucose scarcity", "The ZAK–NIK cascade suppresses noncanonical NF-κB signaling and IL-9", "ZAK targeting rejuvenates Th9 cells and improves antitumor efficacy" ], "hypothesis": "Nutrient scarcity forces adoptively transferred T cells into inefficient mitochondrial metabolism that elevates ROS, causing DNA damage responses that initiate irreversible senescence and loss of persistence. Mechanism: Substrate limitation and electron-transport inefficiency increase mitochondrial ROS; ROS-induced double-strand breaks activate ATM/ATR–p53–p21 and p16INK4a pathways, establishing stable senescence. Prediction: Mitochondria-targeted antioxidants or SOD2 overexpression in transferred cells should reduce DDR foci and senescence markers and improve persistence under nutrient stress, whereas AMPK or GCN2 inhibition alone would not fully phenocopy this rescue if ROS is the dominant driver.", "position": 2, "stratum": "unanimous_0", "selected": false, "human_score": 2, "judge_scores": [ 2, 1, 1 ], "judge_median": 1, "weight": 51.0 }, { "item": "9bc76d574f", "id": "gpt-6-astra|N|R42786310|1", "task": "R42786310", "generator": "gpt-6-astra", "background": "Ageing involves coordinated deterioration across metabolic, immune and organ systems, accompanied by changes in host-associated microbial communities. Microbiome composition correlates with biological age and age-related physiological states, but such associations do not establish whether individual microorganisms can modify the ageing process. Some microbial interventions alter host metabolism and longevity in experimental models, although causal effects often depend on organism viability, microbial products and host context. It therefore remained unclear whether systematic integration of diverse human biological measurements could identify a microorganism with experimentally reproducible geroprotective activity.", "question": "Can a commensal microorganism predicted from integrated human ageing profiles causally extend lifespan and healthspan and shift age-associated molecular and microbial states toward younger configurations?", "finding": "Neisseria flavescens was identified as a candidate geroprotective commensal and experimentally shown to extend lifespan and healthspan in Caenorhabditis elegans when administered live. In aged mice, heat-killed N. flavescens shifted the serum metabolome, liver transcriptome and gut microbiome toward younger states, while isolated strains were confirmed to produce predicted beneficial metabolites.", "key_points": [ "Neisseria flavescens is the causal candidate", "Live bacteria extend C. elegans lifespan and healthspan", "Heat-killed bacteria rejuvenate multiple ageing-associated profiles in mice", "Isolated strains produce beneficial metabolites predicted by multi-modality analysis" ], "hypothesis": "The nominated commensal extends lifespan and healthspan through a specific secreted metabolite whose production declines in ageing-associated microbial communities. Restoring that metabolite is sufficient to reproduce the organism's protective effects. Mechanism: A microbial metabolite activates a defined host receptor and downstream stress-resistance pathways, shifting tissue transcription and metabolism toward independently established younger reference states. Prediction: Deleting the microbial metabolite-synthesis pathway abolishes protection, purified metabolite supplementation restores it, and disrupting its host receptor blocks both microbial and metabolite-mediated benefits.", "position": 1, "stratum": "unanimous_3", "selected": false, "human_score": 2, "judge_scores": [ 3, 3, 3 ], "judge_median": 3, "weight": 5.533333333333333 }, { "item": "9c6841bbb8", "id": "claude-opus-5-5|N|R42723546|1", "task": "R42723546", "generator": "claude-opus-5-5", "background": "Chronic ultraviolet exposure causes skin photoaging characterized by impaired barrier function, collagen loss, cellular senescence, and persistent inflammation. Damaged cells can accumulate dysfunctional organelles and release intracellular danger signals that sustain sterile inflammatory responses. Regenerative cell-free therapies have shown potential for repairing aged or injured tissues, but their activity can involve many distinct biological processes. The causal mechanism by which such therapies might suppress photoaging-associated senescence and inflammation remained unresolved.", "question": "Can a cell-free regenerative treatment alleviate UV-induced skin photoaging, and which causal intracellular mechanism mediates its protective effects?", "finding": "Human umbilical cord mesenchymal stem cell secretome protects against UV-induced photoaging by enhancing mitophagy, which clears damaged mitochondria and reduces cytosolic mitochondrial DNA leakage. This suppresses cGAS-STING signaling and downstream inflammatory cytokines; mitophagy inhibition abolishes protection, while STING inhibition restores it.", "key_points": [ "The secretome alleviates UV-induced photoaging and cellular senescence", "Enhanced mitophagy removes damaged mitochondria", "Reduced mitochondrial DNA leakage suppresses cGAS-STING signaling", "Mitophagy inhibition abolishes the protective effect", "STING inhibition rescues protection despite blocked mitophagy" ], "hypothesis": "The protective effect is mediated by preventing release of mitochondrial DNA into the cytosol and thereby silencing cGAS–STING signalling. Cell-free treatment keeps mitochondrial membrane integrity intact after UV, so no cytosolic mtDNA accumulates to trigger the type-I interferon and senescence-associated secretory programme. Mechanism: UV-induced mitochondrial permeability (VDAC/BAX macropore) leaks mtDNA to the cytosol, activating cGAS, STING, TBK1 and IRF3 plus NF-kB — the canonical driver of SASP in photoaged skin. The secretome suppresses macropore formation and/or accelerates mtDNA degradation, collapsing the interferon-stimulated gene signature and IL-6/IL-8/CXCL10 output; senescence markers fall as a downstream consequence. Prediction: Cytosolic mtDNA (digitonin fractionation, anti-dsDNA puncta) and phospho-TBK1/phospho-IRF3 rise with UV and are normalized by treatment; STING-knockout or H-151-treated skin shows no additional benefit from the preparation (epistasis), whereas a mitophagy-centred alternative would still show measurable benefit in STING-null tissue.", "position": 1, "stratum": "unanimous_3", "selected": false, "human_score": 3, "judge_scores": [ 3, 3, 3 ], "judge_median": 3, "weight": 5.533333333333333 }, { "item": "9f0b843920", "id": "gemini-4-argon-high|N|R42723546|3", "task": "R42723546", "generator": "gemini-4-argon-high", "background": "Chronic ultraviolet exposure causes skin photoaging characterized by impaired barrier function, collagen loss, cellular senescence, and persistent inflammation. Damaged cells can accumulate dysfunctional organelles and release intracellular danger signals that sustain sterile inflammatory responses. Regenerative cell-free therapies have shown potential for repairing aged or injured tissues, but their activity can involve many distinct biological processes. The causal mechanism by which such therapies might suppress photoaging-associated senescence and inflammation remained unresolved.", "question": "Can a cell-free regenerative treatment alleviate UV-induced skin photoaging, and which causal intracellular mechanism mediates its protective effects?", "finding": "Human umbilical cord mesenchymal stem cell secretome protects against UV-induced photoaging by enhancing mitophagy, which clears damaged mitochondria and reduces cytosolic mitochondrial DNA leakage. This suppresses cGAS-STING signaling and downstream inflammatory cytokines; mitophagy inhibition abolishes protection, while STING inhibition restores it.", "key_points": [ "The secretome alleviates UV-induced photoaging and cellular senescence", "Enhanced mitophagy removes damaged mitochondria", "Reduced mitochondrial DNA leakage suppresses cGAS-STING signaling", "Mitophagy inhibition abolishes the protective effect", "STING inhibition rescues protection despite blocked mitophagy" ], "hypothesis": "Cell-free regenerative treatment alleviates photoaging by delivering specific regulatory microRNAs that directly silence pro-inflammatory and matrix-degrading transcripts while disinhibiting TGF-β/Smad signaling. This post-transcriptional reprogramming halts extracellular matrix breakdown and paracrine senescence without requiring primary changes in organelle turnover. Mechanism: Extracellular vesicles within the cell-free therapy fuse with dermal fibroblasts and transfer functional miRNAs (such as miR-146a, miR-29, or miR-125b) into the cytoplasm, where they bind the 3'-UTRs of TRAF6/IRAK1, AP-1 subunits, and Smad7 mRNAs. This simultaneously suppresses NF-κB/MAPK-driven transcription of matrix metalloproteinases (MMP-1, MMP-3) and inflammatory cytokines while restoring TGF-β receptor-mediated Smad2/3 phosphorylation to drive type I and III collagen synthesis. Prediction: Depletion of vesicular RNA cargo (via Dicer knockout in producer cells or RNase treatment of permeabilized vesicles) or transfection of specific anti-miR oligonucleotides into recipient fibroblasts will eliminate the therapy's ability to suppress MMP-1/3 and restore collagen I levels after UV irradiation, without altering baseline mitochondrial membrane potential or mitophagy rates.", "position": 3, "stratum": "unanimous_0", "selected": false, "human_score": 1, "judge_scores": [ 2, 2, 2 ], "judge_median": 2, "weight": 51.0 }, { "item": "a009835d80", "id": "claude-opus-5-5|N|R42665751|0", "task": "R42665751", "generator": "claude-opus-5-5", "background": "Ovarian function declines earlier than the function of many other organs, reducing fertility and altering endocrine health. Age-related deterioration of cellular quality, tissue communication and inflammatory homeostasis has been implicated in this process. Mitochondrial dysfunction is common in ageing reproductive tissues, but whether it directly initiates ovarian decline rather than merely accompanying it has remained uncertain. The molecular signals linking mitochondrial stress to dysfunction across the ovarian follicle were unknown.", "question": "How does age-associated mitochondrial dysfunction initiate and propagate inflammatory signaling that causes ovarian functional decline?", "finding": "Ageing-associated mitochondrial DNA leakage from oocytes activates oocyte cGAS, generating cGAMP that triggers STING signaling and passes through gap junctions to activate STING in surrounding granulosa cells. Genetic deletion of oocyte Cgas or pharmacological STING inhibition ameliorates inflammation and ovarian dysfunction, establishing this signaling axis as a causal driver of ovarian ageing.", "key_points": [ "Mitochondrial stress causes mtDNA leakage from oocytes", "Leaked mtDNA activates the cGAS–cGAMP–STING pathway", "Oocyte-derived cGAMP transmits signaling to granulosa cells through gap junctions", "Pathway activation promotes ovarian inflammation and functional decline", "Genetic or pharmacological pathway inhibition rescues ovarian dysfunction" ], "hypothesis": "Age-associated loss of mitochondrial DNA integrity in oocytes and granulosa cells causes release of mtDNA into the cytosol, which activates the cGAS–STING pathway and initiates type I interferon and NF-κB–driven inflammatory signaling within the follicle. This cell-intrinsic innate-immune activation, rather than infiltrating immune cells, is the initiating event of ovarian functional decline. Mechanism: Oxidative damage and reduced mitophagy in aged follicles permit mtDNA escape through BAX/BAK macropores and VDAC oligomers into the cytosol. Cytosolic mtDNA binds cGAS, generating cGAMP that activates STING, driving TBK1/IRF3 interferon output and NF-κB induction of IL-6, IL-1β and CXCL10. The resulting local inflammatory milieu impairs granulosa steroidogenesis and accelerates follicular atresia. Prediction: Oocyte- or granulosa-specific deletion of Cgas or Sting1, or pharmacological STING inhibition (H-151), in aged or mitochondrially stressed mice preserves follicle reserve, estradiol/AMH levels and fertility while leaving mtDNA copy number and oxidative damage unchanged — i.e. the mitochondrial lesion persists but the functional decline is prevented. Conversely, ovarian expression of a mitochondrial nuclease-resistant mtDNA-releasing mutant (e.g. TFAM haploinsufficiency) reproduces the decline, and it is rescued by STING loss.", "position": 0, "stratum": "selected", "selected": true, "human_score": 4, "judge_scores": [ 4, 4, 4 ], "judge_median": 4, "weight": 2.0 }, { "item": "a37ad3de73", "id": "claude-opus-5-5|N|R42858183|3", "task": "R42858183", "generator": "claude-opus-5-5", "background": "Aging is accompanied by declining lysosomal activity, impaired autophagic clearance, and loss of protein homeostasis. These changes contribute to progressive functional deterioration and increase vulnerability to protein-aggregation disorders. Restoring cellular clearance systems can sometimes improve lifespan or healthspan in model organisms. However, interventions that preserve lysosomal competence during aging and the mechanisms through which they act remain incompletely understood.", "question": "Can a defined intervention preserve lysosomal function and protein homeostasis during aging, thereby extending lifespan and maintaining organismal function, and through what mechanism?", "finding": "20(S)-ginsenoside Rg3 extended lifespan and preserved physiological and neuronal function in Caenorhabditis elegans by restoring lysosomal activity and autophagic flux. Rg3 remodeled neuronal lysosomal phosphoinositide signatures toward increased PI(4)P and reduced PI(3)P, suppressed RSKS-1/S6K–TORC1 signaling, and promoted nuclear HLH-30/TFEB activity, thereby improving proteostasis and resistance to polyglutamine- and α-synuclein-associated toxicity.", "key_points": [ "Rg3 extends lifespan and preserves healthspan", "Lysosomal function and autophagic flux are restored during aging", "Neuronal phosphoinositides shift toward higher PI(4)P and lower PI(3)P", "TORC1–RSKS-1/S6K signaling is suppressed and HLH-30/TFEB enters the nucleus", "Protein aggregation and neurodegeneration are reduced" ], "hypothesis": "Loss of lysosomal membrane lipid composition — specifically depletion of bis(monoacylglycero)phosphate (BMP/LBPA) and phosphatidylinositol-3,5-bisphosphate — rather than loss of hydrolases, drives age-related lysosomal failure; restoring PI(3,5)P2 by adult-onset activation of PIKfyve or supplementation of BMP precursors preserves fusion competence, calcium signaling and lifespan. Mechanism: PI(3,5)P2 recruits fusion and ion-channel machinery (TRPML1/CUP-5, HOPS effectors) and supports lysosomal Ca2+ release that feeds back on TFEB via calcineurin; age-related decline fragments this loop, blocking autophagosome–lysosome fusion and lysosome reformation. Restoring the lipid re-establishes TRPML1-dependent Ca2+ efflux, calcineurin–TFEB signaling and fusion. Prediction: PIKfyve-activated old animals show restored lysosomal Ca2+ transients (GCaMP-tagged lysosomal probes), normalized autophagosome–lysosome fusion rates and lifespan extension; the benefit is lost in trpml1/cup-5 mutants or with calcineurin inhibition, whereas hydrolase overexpression alone does not rescue fusion — separating a lipid/ion-signaling mechanism from an enzyme-abundance mechanism.", "position": 3, "stratum": "split_2_1", "selected": false, "human_score": 2, "judge_scores": [ 2, 3, 3 ], "judge_median": 3, "weight": 1.8 }, { "item": "a49f2fba78", "id": "claude-opus-5-5|N|R42689491|4", "task": "R42689491", "generator": "claude-opus-5-5", "background": "Hutchinson-Gilford progeria syndrome is a rare genetic disorder characterized by accelerated, multisystem features of ageing. Progressive skeletal abnormalities are a prominent component of the disease in both patients and experimental models. These abnormalities involve impaired bone formation, remodeling, and mechanical integrity. It remained unclear whether established skeletal pathology could be meaningfully reversed in vivo and how strongly therapeutic efficacy would depend on the age at treatment.", "question": "Can in vivo correction of the HGPS-causing mutation rescue molecular, cellular, and structural defects in bone, and how does treatment timing affect efficacy?", "finding": "Adenine base editing of the pathogenic LMNA variant reduced progerin expression, restored extracellular-matrix deposition and mineralization in progeroid osteoblasts, and partially rescued bone structure and physical properties in mice. In vivo correction was strongly age-dependent, with early postnatal delivery producing substantially greater editing and skeletal benefit than later treatment.", "key_points": [ "Correction of the pathogenic LMNA variant", "Reduced progerin transcripts and protein", "Improved osteoblast matrix deposition and mineralization", "Partial rescue of bone structure and physical properties", "Greater efficacy with early postnatal treatment" ], "hypothesis": "Because growth-plate chondrocytes and periosteal cells are poorly transduced by systemic AAV at later ages, late correction will rescue remodeling-accessible trabecular bone and matrix quality but not longitudinal growth or periosteal expansion; efficacy timing is thus partly a delivery-tropism limitation rather than an intrinsic irreversibility of the cells. Mechanism: Editing reach depends on the proliferative and vascular state of each skeletal compartment. Early treatment coincides with an active growth plate and expanding periosteum with high vector uptake and subsequent clonal expansion of corrected cells; after growth-plate closure/slowing, corrected alleles cannot be amplified and cortical geometry is fixed. Prediction: Allele-correction frequency measured separately in growth-plate cartilage, periosteum, cortical bone and marrow stroma will fall with treatment age most steeply in cartilage/periosteum; delivering the editor locally (intra-osseous or periosteal injection, or a bone-targeted/osteotropic vector) at the late time point will recover a significant part of the lost cortical and length rescue, outperforming systemic delivery at the same age.", "position": 4, "stratum": "split_2_1", "selected": false, "human_score": 3, "judge_scores": [ 3, 2, 3 ], "judge_median": 3, "weight": 1.8 }, { "item": "a4d5577d03", "id": "claude-opus-5-5|N|R42786310|1", "task": "R42786310", "generator": "claude-opus-5-5", "background": "Ageing involves coordinated deterioration across metabolic, immune and organ systems, accompanied by changes in host-associated microbial communities. Microbiome composition correlates with biological age and age-related physiological states, but such associations do not establish whether individual microorganisms can modify the ageing process. Some microbial interventions alter host metabolism and longevity in experimental models, although causal effects often depend on organism viability, microbial products and host context. It therefore remained unclear whether systematic integration of diverse human biological measurements could identify a microorganism with experimentally reproducible geroprotective activity.", "question": "Can a commensal microorganism predicted from integrated human ageing profiles causally extend lifespan and healthspan and shift age-associated molecular and microbial states toward younger configurations?", "finding": "Neisseria flavescens was identified as a candidate geroprotective commensal and experimentally shown to extend lifespan and healthspan in Caenorhabditis elegans when administered live. In aged mice, heat-killed N. flavescens shifted the serum metabolome, liver transcriptome and gut microbiome toward younger states, while isolated strains were confirmed to produce predicted beneficial metabolites.", "key_points": [ "Neisseria flavescens is the causal candidate", "Live bacteria extend C. elegans lifespan and healthspan", "Heat-killed bacteria rejuvenate multiple ageing-associated profiles in mice", "Isolated strains produce beneficial metabolites predicted by multi-modality analysis" ], "hypothesis": "The geroprotective effect is mediated by one or a few diffusible microbial metabolites rather than by the organism itself: oral administration of the strain's cell-free conditioned medium, or of the single purified dominant metabolite, reproduces the healthspan and molecular rejuvenation phenotype in non-colonised animals. Mechanism: The strain produces a metabolite (candidate classes: indole/tryptophan derivatives acting on AhR, short-chain fatty acids acting on GPR43/GPR109A and HDAC inhibition, polyamines such as spermidine inducing autophagy, or a bile-acid derivative acting on TGR5/FXR) that enters portal circulation and reprogrammes host transcriptional and epigenetic state. Prediction: Metabolomics identifies a metabolite elevated in serum of treated animals and in young humans; supplementing that metabolite alone recapitulates ≥60% of the frailty-index and transcriptomic-age improvement, and a biosynthesis-knockout mutant of the strain colonises normally but loses the effect.", "position": 1, "stratum": "split_2_1", "selected": false, "human_score": 3, "judge_scores": [ 3, 3, 2 ], "judge_median": 3, "weight": 1.8 }, { "item": "a6e5ccfefe", "id": "grok-4.5|N|R42810392|2", "task": "R42810392", "generator": "grok-4.5", "background": "Ageing is strongly influenced by conserved systems that coordinate cellular metabolism with nutrient and energy availability. Genetic studies have shown that altering metabolic regulation can affect lifespan in several model organisms. Pharmacological studies, however, often use compounds with multiple targets, making it difficult to attribute longevity effects to a specific mechanism. It therefore remained unclear whether selective engagement of a single conserved metabolic target could directly produce longevity benefits across species.", "question": "Can direct pharmacological activation of a conserved metabolic target extend lifespan across evolutionarily diverse organisms and induce longevity-associated changes in mammals?", "finding": "Direct pharmacological activation of AMPK with compound 991 extends lifespan in Drosophila melanogaster, Caenorhabditis elegans, and Schizosaccharomyces pombe. In mice, 991 induces a proteomic profile associated with pro-longevity biology, supporting the translational potential of AMPK activation.", "key_points": [ "Direct AMPK activation by compound 991", "Lifespan extension in yeast, worms, and flies", "Conserved causal longevity effect across species", "Pro-longevity proteomic response in mice" ], "hypothesis": "Cross-species lifespan extension from activating a conserved metabolic target depends on FOXO/DAF-16 orthologs. AMPK (or the analogous sensor) extends life by stabilizing or activating FOXO-dependent stress-resistance and detoxification programs. Mechanism: AMPK phosphorylates and promotes nuclear FOXO/DAF-16 activity, inducing antioxidant, proteostasis, and stress-response genes that are causal for longevity in invertebrates and for healthspan-related gene programs in mammals. Prediction: Loss of FOXO/DAF-16 orthologs will eliminate lifespan gains from the selective agonist in worms/flies, and mammalian FOXO-deficient tissues will fail to show the longevity-associated transcriptional signature despite AMPK engagement.", "position": 2, "stratum": "split_1_2", "selected": false, "human_score": 3, "judge_scores": [ 2, 2, 3 ], "judge_median": 2, "weight": 2.8 }, { "item": "a79c870e48", "id": "gemini-4-argon-high|N|R42758848|3", "task": "R42758848", "generator": "gemini-4-argon-high", "background": "Ageing is accompanied by a progressive weakening of adaptive immune responses, which reduces protection against infections and cancer. Effective immunity requires resting immune cells to preserve metabolic competence while remaining ready for rapid activation. Age-related changes in chromatin regulation and cellular metabolism have both been implicated in immune dysfunction. However, the mechanism that establishes this latent metabolic readiness and how ageing disrupts it remained unclear.", "question": "What developmentally established epigenetic mechanism preserves metabolic readiness for rapid immune activation, and how is it disrupted during ageing?", "finding": "Tonic IL-7 signaling establishes a GABPα-dependent program that deposits H2A.Z at oxidative-phosphorylation gene promoters in quiescent naïve CD8+ T cells, priming their rapid metabolic and functional activation. Age-related loss of IL-7 signaling reduces H2A.Z occupancy and impairs activation, while IL-7 supplementation or enforced H2A.Z expression rescues the defect.", "key_points": [ "Ageing reduces tonic IL-7 signaling", "GABPα regulates H2A.Z deposition", "H2A.Z primes OXPHOS gene promoters", "Loss of this axis impairs naïve CD8+ T-cell activation", "IL-7 or H2A.Z restoration rescues the age-related defect" ], "hypothesis": "During immune cell maturation, replication-independent histone chaperones HIRA and SRCAP deposit the histone variants H3.3 and H2A.Z at the promoters of nuclear-encoded mitochondrial and glycolytic genes to maintain nucleosome-depleted regions and promoter-proximal paused RNA Polymerase II in quiescent cells. Ageing impairs histone chaperone activity and variant turnover, leading to canonical H3.1/H2A nucleosome encroachment that eliminates paused RNA Pol II and delays the transcriptional burst required for metabolic remodeling. Mechanism: Developmental maturation establishes a labile H3.3/H2A.Z dual-variant nucleosome architecture flanking the transcription start sites of bioenergetic genes, lowering the energy barrier for Pol II pause release (via P-TEFb/CDK9) immediately after antigen receptor stimulation; during ageing, declining HIRA/SRCAP expression and proteostatic stress result in replacement of labile H2A.Z/H3.3 nucleosomes with stable canonical nucleosomes that sterically block pre-initiation complex assembly and Pol II pausing. Prediction: PRO-seq and CUT&RUN for H2A.Z, H3.3, and Ser5-phosphorylated RNA Pol II in resting young and aged naive lymphocytes will show selective depletion of H2A.Z/H3.3 and paused Pol II at mitochondrial and glycolytic promoters in aged cells before stimulation, whereas overexpressing HIRA or SRCAP in aged hematopoietic progenitors will restore promoter Pol II pausing and rapid post-activation bioenergetic flux.", "position": 3, "stratum": "unanimous_3", "selected": false, "human_score": 3, "judge_scores": [ 3, 3, 4 ], "judge_median": 3, "weight": 5.533333333333333 }, { "item": "a9351456cc", "id": "gpt-6-astra|N|R42748238|0", "task": "R42748238", "generator": "gpt-6-astra", "background": "Microvascular function declines with age, impairing tissue perfusion, nutrient delivery, and waste clearance. Vascular deterioration is associated with dysfunction across multiple organs and with increased frailty and mortality. Cellular senescence and altered metabolic homeostasis are recognized contributors to age-related tissue decline. However, the molecular mechanism by which vascular aging can drive organism-wide aging and shorten lifespan remained unclear.", "question": "What molecular mechanism causes age-related vascular deterioration to promote systemic senescence and shorten lifespan?", "finding": "Progressive activation of endothelial C/EBPβ induces AEP, which cleaves NAMPT and thereby causes systemic NAD+ depletion, vascular dysfunction, senescence, and reduced lifespan. Genetic disruption of AEP or expression of cleavage-resistant NAMPT N136A ameliorates these effects, while AEP inhibition or NMN supplementation alleviates age-related vascular decline.", "key_points": [ "Endothelial C/EBPβ activates AEP during aging", "AEP cleaves the NAD+ biosynthetic enzyme NAMPT", "NAMPT cleavage causes systemic NAD+ depletion and senescence", "The pathway drives vascular dysfunction and lifespan reduction", "Blocking AEP or preventing NAMPT cleavage rescues the phenotype" ], "hypothesis": "Ageing endothelial cells increase CD38-dependent degradation of extracellular NAD+ precursors, limiting NAD+ replenishment in surrounding tissues. The resulting loss of sirtuin activity drives systemic senescence and shortens lifespan. Mechanism: Increased endothelial CD38 activity reduces extracellular nicotinamide mononucleotide availability, lowering parenchymal NAD+ and compromising SIRT1-dependent DNA repair and SIRT3-dependent mitochondrial protection. Prediction: Endothelial-specific CD38 deletion in aged mice would restore precursor availability and tissue NAD+, reduce senescence across organs, and extend survival despite persistent capillary rarefaction; disrupting NAD+ salvage in recipient tissues would abolish this protection.", "position": 0, "stratum": "split_1_2", "selected": false, "human_score": 3, "judge_scores": [ 3, 2, 2 ], "judge_median": 2, "weight": 2.8 }, { "item": "ade017eef6", "id": "gpt-6-astra|N|R42723144|2", "task": "R42723144", "generator": "gpt-6-astra", "background": "Ovarian function declines with age, eventually causing reproductive senescence and broader endocrine changes that affect female healthspan. The pace of this decline varies substantially among individuals, even when chronological age is similar. Both nuclear and non-nuclear inherited factors could contribute to this variation, but their causal roles are difficult to separate because genetic backgrounds commonly differ at many loci. The mechanisms connecting inherited variation to follicle depletion, tissue pathology and loss of ovarian function therefore remain poorly understood.", "question": "Can naturally occurring inherited genetic variation alter the rate of ovarian ageing on equivalent heterogeneous nuclear backgrounds, and what cellular mechanism mediates this effect?", "finding": "The OKC-HETW mitochondrial haplotype accelerated ovarian ageing, causing faster primordial-follicle loss, inflammatory and fibrotic remodelling, mitochondrial dysfunction and impaired ovulation relative to the OKC-HETB haplotype on equivalently distributed nuclear backgrounds. Despite normal TFAM expression and elevated total TFAM protein, OKC-HETW ovaries had reduced mitochondrial TFAM, TFAM–mtDNA binding and TOMM20, supporting defective mitochondrial protein import and compromised mtDNA maintenance as the mechanism linking haplotype to accelerated decline.", "key_points": [ "Mitochondrial haplotype causally modifies the rate of ovarian ageing", "OKC-HETW accelerates follicle depletion and pathological ovarian remodelling", "The susceptible haplotype reduces respiratory activity, ATP production and mtDNA copy number", "Reduced TOMM20 and mitochondrial TFAM indicate defective TFAM import and mtDNA maintenance", "Molecular and tissue defects correspond to impaired ovarian function" ], "hypothesis": "Naturally inherited mitochondrial variants accelerate ovarian ageing by provoking sterile inflammation within the ovary. The resulting inflammatory and fibrotic niche drives follicle loss on otherwise equivalent nuclear backgrounds. Mechanism: Mitochondrial instability increases cytosolic mitochondrial DNA in ovarian stromal cells and macrophages, activating cGAS–STING signalling and inflammatory cytokine production that promote fibrosis and follicular injury. Prediction: Cytosolic mitochondrial DNA and stromal or macrophage STING activation rise before genotype-dependent fibrosis and follicle depletion. Disabling this pathway in those compartments reduces the ageing difference despite persistence of the mitochondrial respiratory defect.", "position": 2, "stratum": "split_1_2", "selected": false, "human_score": 2, "judge_scores": [ 2, 3, 2 ], "judge_median": 2, "weight": 2.8 }, { "item": "ae48a7f5e9", "id": "gemini-4-argon-high|N|R42630044|0", "task": "R42630044", "generator": "gemini-4-argon-high", "background": "Mechanical loading normally stimulates bone formation and helps maintain skeletal strength. This anabolic response becomes weaker with age, contributing to cortical bone loss and osteoporosis risk. Bone cells detect physical forces and translate them into signals that regulate the balance between bone formation and resorption. The molecular defect responsible for diminished mechanosensitivity in aged bone, and whether it can be overcome, remained unclear.", "question": "What mechanism limits the anabolic response of aged bone to mechanical loading, and can targeted stimulation restore this response?", "finding": "In aged mouse bone, activation of Piezo1 during mechanical loading promotes its membrane co-localization with connexin 43 and increases connexin 43 hemichannel activity through PI3K-Akt signaling. Hemichannel opening increases PGE2 release, suppresses sclerostin, promotes endosteal bone formation, inhibits resorption, and thereby restores the cortical anabolic response to loading.", "key_points": [ "Piezo1 activation must accompany mechanical loading to rescue aged bone", "Piezo1 interacts and co-localizes with connexin 43", "PI3K-Akt signaling activates connexin 43 hemichannels", "Hemichannel opening increases PGE2 and suppresses sclerostin", "The pathway increases cortical bone mass by favoring formation over resorption" ], "hypothesis": "Age-related downregulation of the mechanosensitive cation channel Piezo1 in osteocytes and periosteal osteoprogenitors blunts force-induced calcium influx, limiting the anabolic response of aged bone to mechanical loading. Targeted pharmacological stimulation of Piezo1 lowers the mechanical activation threshold and restores load-induced bone formation in aged skeletons. Mechanism: In young bone, fluid shear stress and membrane tension generated by mechanical loading open Piezo1 channels in osteocytes and osteoprogenitors, triggering rapid intracellular Ca2+ influx that activates calcineurin/NFAT, YAP/TAZ nuclear translocation, and Wnt1 expression to drive osteogenesis. With ageing, reduced Piezo1 expression and altered membrane mechanics attenuate load-induced Ca2+ transients and downstream osteogenic transcription; administering a selective Piezo1 agonist (such as Yoda1) sensitizes remaining channels to physiological strain and re-establishes anabolic signaling. Prediction: Osteocytes in aged mice exhibit blunted intracellular Ca2+ spikes and failed Wnt1 induction under physiological tibial loading despite normal macroscopic bone strain, and systemic or local administration of a selective Piezo1 agonist synergizes with mechanical loading to restore periosteal mineral apposition rate to young-adult levels without rescuing bone formation in osteocyte-specific Piezo1-knockout mice.", "position": 0, "stratum": "unanimous_3", "selected": false, "human_score": 3, "judge_scores": [ 3, 3, 3 ], "judge_median": 3, "weight": 5.533333333333333 }, { "item": "af29fa1825", "id": "gemini-4-argon-high|N|R42775695|0", "task": "R42775695", "generator": "gemini-4-argon-high", "background": "Cardiac function progressively deteriorates with age, increasing susceptibility to heart failure and other cardiovascular disorders. Defective mitochondrial quality control is considered an important contributor to this decline. Selective removal of damaged mitochondria must remain properly balanced, because disruption at multiple stages of the process can impair cellular homeostasis. The upstream causes of this age-associated defect and whether it can be therapeutically reversed were not well established.", "question": "What causes defective mitochondrial quality-control flux in the aging heart, and how can restoring mitochondrial homeostasis reverse cardiac aging?", "finding": "Age-associated upregulation of HIF-3α drives excessive BNIP3 expression in senescent cardiomyocytes, causing mitophagy flux congestion and cardiac aging. Mitochondrial transplantation restores intracellular ATP homeostasis, restrains pathological HIF-3α–BNIP3 signaling, normalizes mitophagy flux, and rejuvenates the aging heart.", "key_points": [ "HIF-3α is aberrantly elevated with cardiac aging", "HIF-3α directly promotes excessive BNIP3 expression", "Overactive HIF-3α–BNIP3 signaling causes mitophagy flux congestion", "Mitochondrial transplantation restores ATP homeostasis and suppresses the axis", "Normalized mitophagy flux reverses age-related cardiac dysfunction" ], "hypothesis": "Age-associated hyperactivation of cardiac mTORC1 and upregulation of the Beclin-1 inhibitor Rubicon, combined with impaired TFEB nuclear translocation, block late-stage mitophagosome-lysosome fusion and lysosomal acidification in cardiomyocytes, stalling mitophagy flux mid-stream. Therapeutically restoring lysosomal biogenesis and autolysosomal fusion clears accumulated mitophagosomal intermediates, suppresses cytosolic mtDNA sensing, and reverses age-related diastolic and systolic dysfunction. Mechanism: In aged cardiomyocytes, chronic nutrient and stress signaling elevates mTORC1 activity and Rubicon expression, which inhibits the UVRAG-Vps34 complex and retains TFEB in the cytosol while diminishing v-ATPase-dependent lysosomal acidification. Because early mitochondrial damage continues to trigger priming and autophagosomal engulfment against a downstream bottleneck in Rab7/SNARE-mediated lysosomal fusion and proteolysis, un-degraded mitophagosomes accumulate, leak oxidized mtDNA into the cytosol, and activate cGAS-STING and NLRP3 inflammatory signaling. Prediction: Dual-fluorescent mitophagy reporter mice (such as mt-Keima or mito-QC) will show an increased ratio of neutral-pH mitophagosomes to acidic mitolysosomes in aged hearts rather than a lack of autophagosomal sequestration; furthermore, stimulating early mitophagy initiation alone will exacerbate cardiomyocyte toxicity, whereas Rubicon depletion or TFEB activation will restore acidic mitolysosome formation and rescue ventricular function.", "position": 0, "stratum": "selected", "selected": true, "human_score": 3, "judge_scores": [ 2, 2, 2 ], "judge_median": 2, "weight": 2.0 }, { "item": "af35c92152", "id": "gemini-4-argon-high|N|R42723144|1", "task": "R42723144", "generator": "gemini-4-argon-high", "background": "Ovarian function declines with age, eventually causing reproductive senescence and broader endocrine changes that affect female healthspan. The pace of this decline varies substantially among individuals, even when chronological age is similar. Both nuclear and non-nuclear inherited factors could contribute to this variation, but their causal roles are difficult to separate because genetic backgrounds commonly differ at many loci. The mechanisms connecting inherited variation to follicle depletion, tissue pathology and loss of ovarian function therefore remain poorly understood.", "question": "Can naturally occurring inherited genetic variation alter the rate of ovarian ageing on equivalent heterogeneous nuclear backgrounds, and what cellular mechanism mediates this effect?", "finding": "The OKC-HETW mitochondrial haplotype accelerated ovarian ageing, causing faster primordial-follicle loss, inflammatory and fibrotic remodelling, mitochondrial dysfunction and impaired ovulation relative to the OKC-HETB haplotype on equivalently distributed nuclear backgrounds. Despite normal TFAM expression and elevated total TFAM protein, OKC-HETW ovaries had reduced mitochondrial TFAM, TFAM–mtDNA binding and TOMM20, supporting defective mitochondrial protein import and compromised mtDNA maintenance as the mechanism linking haplotype to accelerated decline.", "key_points": [ "Mitochondrial haplotype causally modifies the rate of ovarian ageing", "OKC-HETW accelerates follicle depletion and pathological ovarian remodelling", "The susceptible haplotype reduces respiratory activity, ATP production and mtDNA copy number", "Reduced TOMM20 and mitochondrial TFAM indicate defective TFAM import and mtDNA maintenance", "Molecular and tissue defects correspond to impaired ovarian function" ], "hypothesis": "Inherited natural variation in mtDNA oxidative phosphorylation capacity accelerates ovarian ageing on equivalent heterogeneous nuclear backgrounds by impairing granulosa cell bioenergetics and lowering the mitochondrial NAD+/NADH ratio. This bioenergetic and redox deficit compromises sirtuin-dependent mitophagy and steroidogenesis in supporting somatic cells, driving premature follicular atresia and endocrine decline. Mechanism: Natural variants in mtDNA respiratory chain subunits or tRNAs reduce Complex I/III/IV catalytic efficiency in metabolically active mural and cumulus granulosa cells, diminishing ATP synthesis and causing NADH accumulation. The resulting drop in NAD+ availability suppresses SIRT1 and SIRT3 deacetylase activity, impairing PINK1/Parkin-mediated mitophagy and StAR-dependent steroidogenesis, which triggers mitochondrial depolarization and caspase-3-mediated granulosa cell apoptosis in growing follicles. Prediction: Females carrying the risk mtDNA variant on an equivalent heterogeneous nuclear background will exhibit a reduced NAD+/NADH ratio and lower maximal oxygen consumption rate in isolated granulosa cells, increased rates of TUNEL-positive atretic secondary and antral follicles despite initially normal primordial counts, early declines in circulating estradiol and AMH, and rescue of follicle survival upon supplementation with NAD+ precursors such as nicotinamide mononucleotide (NMN).", "position": 1, "stratum": "split_1_2", "selected": false, "human_score": 2, "judge_scores": [ 2, 2, 3 ], "judge_median": 2, "weight": 2.8 }, { "item": "af638de7e8", "id": "grok-4.5|N|R42810392|0", "task": "R42810392", "generator": "grok-4.5", "background": "Ageing is strongly influenced by conserved systems that coordinate cellular metabolism with nutrient and energy availability. Genetic studies have shown that altering metabolic regulation can affect lifespan in several model organisms. Pharmacological studies, however, often use compounds with multiple targets, making it difficult to attribute longevity effects to a specific mechanism. It therefore remained unclear whether selective engagement of a single conserved metabolic target could directly produce longevity benefits across species.", "question": "Can direct pharmacological activation of a conserved metabolic target extend lifespan across evolutionarily diverse organisms and induce longevity-associated changes in mammals?", "finding": "Direct pharmacological activation of AMPK with compound 991 extends lifespan in Drosophila melanogaster, Caenorhabditis elegans, and Schizosaccharomyces pombe. In mice, 991 induces a proteomic profile associated with pro-longevity biology, supporting the translational potential of AMPK activation.", "key_points": [ "Direct AMPK activation by compound 991", "Lifespan extension in yeast, worms, and flies", "Conserved causal longevity effect across species", "Pro-longevity proteomic response in mice" ], "hypothesis": "Selective pharmacological activation of AMPK is sufficient to extend lifespan in evolutionarily distant invertebrates and to induce longevity-associated physiological and molecular signatures in mammals. The longevity benefit is caused by AMPK itself rather than off-target pharmacology of multi-target drugs. Mechanism: Direct AMPK activation increases catabolic programs (fatty-acid oxidation, autophagy, mitochondrial biogenesis) and dampens anabolic growth signaling, shifting cells into a conserved energy-sparing, stress-resistant state that slows aging. Prediction: A highly selective AMPK agonist will extend lifespan in C. elegans and Drosophila and, in mice, raise AMPK activity, improve metabolic healthspan markers, and induce transcriptomic/proteomic aging-delay signatures, whereas chemically related inactive analogs will not.", "position": 0, "stratum": "selected", "selected": true, "human_score": 4, "judge_scores": [ 4, 5, 4 ], "judge_median": 4, "weight": 2.0 }, { "item": "b1770d0277", "id": "claude-opus-5-5|N|R42841610|3", "task": "R42841610", "generator": "claude-opus-5-5", "background": "Ageing commonly causes a progressive loss of skeletal muscle mass, strength and regenerative capacity known as sarcopenia. Mitochondrial respiratory dysfunction is a prominent feature of ageing muscle and is associated with cellular senescence. Senescent cells undergo extensive metabolic changes that may compromise tissue function. However, the causal metabolic processes connecting senescence to mitochondrial impairment and functional muscle decline remained incompletely understood.", "question": "What causal metabolic mechanism links cellular senescence to mitochondrial dysfunction and functional decline in ageing skeletal muscle, and can this mechanism be therapeutically reversed?", "finding": "Senescence-associated p38 MAPK signaling increases GLS1 expression and activity in skeletal muscle myoblasts, causing intracellular urea accumulation that impairs mitochondrial function. Inhibiting GLS1 with CB-839 lowers urea, restores electron transport chain complexes and mitochondrial respiration, and improves skeletal muscle integrity and strength in progeroid mice.", "key_points": [ "Senescence activates a p38 MAPK–GLS1 axis", "Elevated GLS1 causes intracellular urea accumulation", "Urea accumulation impairs mitochondrial function", "GLS1 inhibition restores respiratory-chain function", "CB-839 improves muscle structure and strength in progeroid mice" ], "hypothesis": "Senescent cells act as a glycolytic and glutamine sink in the aged muscle niche, secreting lactate and consuming glutamine to the point that neighbouring myofibers face a cytosolic redox (high NADH/NAD+) and anaplerotic (low α-ketoglutarate) constraint; this stalls the TCA cycle at the α-KG step and is reversible by niche-level lactate clearance or α-KG/dimethyl-α-KG supplementation. Mechanism: Senescent cells have high glycolytic flux with lactate export via MCT4 and high glutaminase activity to support SASP biosynthesis. Local extracellular lactate raises myofiber cytosolic NADH/NAD+, inhibiting GAPDH-independent shuttles and reducing malate–aspartate shuttle delivery of reducing equivalents; simultaneous glutamine depletion lowers glutaminolytic anaplerosis and α-KG. Low α-KG both starves the TCA cycle of carbon and reduces α-KG-dependent dioxygenase activity (TET/JmjC, PHD), locking in a hypoxia-like, pro-senescence transcriptional state and reducing oxidative ATP supply to the contractile apparatus. Prediction: Microdialysis or spatial metabolomics of aged muscle should show interstitial lactate elevation and glutamine/α-KG depletion co-localised with senescent cell clusters; MCT4 inhibition or dimethyl-α-ketoglutarate should restore myofiber α-KG, TCA flux (13C labelling into citrate/succinate) and contractile performance, with greater effect than general anti-inflammatory treatment. Glutaminase inhibition should help only if it kills senescent cells rather than merely blocking the sink.", "position": 3, "stratum": "split_2_1", "selected": false, "human_score": 2, "judge_scores": [ 3, 3, 2 ], "judge_median": 3, "weight": 1.8 }, { "item": "b1f4fab341", "id": "grok-4.5|N|R42858183|0", "task": "R42858183", "generator": "grok-4.5", "background": "Aging is accompanied by declining lysosomal activity, impaired autophagic clearance, and loss of protein homeostasis. These changes contribute to progressive functional deterioration and increase vulnerability to protein-aggregation disorders. Restoring cellular clearance systems can sometimes improve lifespan or healthspan in model organisms. However, interventions that preserve lysosomal competence during aging and the mechanisms through which they act remain incompletely understood.", "question": "Can a defined intervention preserve lysosomal function and protein homeostasis during aging, thereby extending lifespan and maintaining organismal function, and through what mechanism?", "finding": "20(S)-ginsenoside Rg3 extended lifespan and preserved physiological and neuronal function in Caenorhabditis elegans by restoring lysosomal activity and autophagic flux. Rg3 remodeled neuronal lysosomal phosphoinositide signatures toward increased PI(4)P and reduced PI(3)P, suppressed RSKS-1/S6K–TORC1 signaling, and promoted nuclear HLH-30/TFEB activity, thereby improving proteostasis and resistance to polyglutamine- and α-synuclein-associated toxicity.", "key_points": [ "Rg3 extends lifespan and preserves healthspan", "Lysosomal function and autophagic flux are restored during aging", "Neuronal phosphoinositides shift toward higher PI(4)P and lower PI(3)P", "TORC1–RSKS-1/S6K signaling is suppressed and HLH-30/TFEB enters the nucleus", "Protein aggregation and neurodegeneration are reduced" ], "hypothesis": "Chronic low-dose Tor inhibition preserves lysosomal acidification and autophagic flux during aging, which sustains protein homeostasis and extends lifespan. The benefit depends on maintained lysosomal protease activity rather than reduced protein synthesis alone. Mechanism: Reduced mTORC1 signaling derepresses TFEB/HLH-30 nuclear translocation, upregulating lysosomal biogenesis and v-ATPase subunits, thereby keeping lumenal pH low and clearance competent with age. Prediction: Genetic or pharmacological blockade of TFEB/HLH-30 or v-ATPase will abolish lifespan extension and lysosomal pH preservation under Tor inhibition, while matching the translation-rate reduction without Tor inhibition will not restore lysosomal competence.", "position": 0, "stratum": "selected", "selected": true, "human_score": 3, "judge_scores": [ 3, 4, 3 ], "judge_median": 3, "weight": 2.0 }, { "item": "b9ee3ad273", "id": "gpt-6-astra|N|R42585340|2", "task": "R42585340", "generator": "gpt-6-astra", "background": "Ageing is accompanied by a progressive loss of protein homeostasis and an accumulation of damaged or aggregation-prone proteins. Mild perturbations of cellular physiology can trigger adaptive responses that increase stress resistance and extend lifespan in several species. Effective removal of damaged proteins is thought to contribute to these benefits, but the responsible transcriptional programs and degradation machinery are incompletely understood. It also remains unclear which components are causally required to connect such adaptive stress responses to improved proteostasis and longevity.", "question": "Which molecular mechanism enables mild cellular stress to preserve protein homeostasis during ageing and extend organismal lifespan?", "finding": "In Caenorhabditis elegans, inhibition of mitochondrial respiration activates an intestinal ELT-2-dependent transcriptional program that increases lysosomal proteolysis during ageing, largely independently of the mitochondrial unfolded protein response. Direct promoter binding by ELT-2, requiring residue R249, and the lysosomal proteases CPR-5 and CPR-8 are necessary for toxic polyglutamine aggregate clearance and mitochondrial stress-induced lifespan extension.", "key_points": [ "Mitochondrial respiration inhibition sustains lysosomal protease transcription", "Intestinal ELT-2 directly activates lysosomal protease genes", "ELT-2 residue R249 is required for transcriptional activity", "The pathway is largely independent of UPRmt", "CPR-5 and CPR-8 are required for aggregate clearance and lifespan extension" ], "hypothesis": "Mild energetic stress preserves proteostasis and extends C. elegans lifespan by activating an AAK-2–HLH-30 transcriptional program that restores lysosomal degradative capacity. Increased lysosomal acidification, rather than increased autophagosome formation alone, is the limiting causal step. Mechanism: AMP-activated protein kinase AAK-2 reduces TORC1 signaling, promoting nuclear accumulation of HLH-30 and expression of lysosomal acidification and proteolysis genes. Acidic, protease-active lysosomes complete degradation of damaged proteins delivered by autophagy. Prediction: Adult-specific attenuation of HLH-30-dependent lysosomal acidification abolishes stress-induced cargo degradation and lifespan extension despite maintained autophagosome production. Constitutively nuclear HLH-30 bypasses AAK-2 loss but fails to restore benefits when lysosomal acidification remains impaired.", "position": 2, "stratum": "split_2_1", "selected": false, "human_score": 3, "judge_scores": [ 3, 3, 2 ], "judge_median": 3, "weight": 1.8 }, { "item": "be4c5550bb", "id": "gemini-4-argon-high|N|R42842666|0", "task": "R42842666", "generator": "gemini-4-argon-high", "background": "Hutchinson-Gilford progeria syndrome is a premature-ageing disorder caused by an LMNA mutation and is characterized by severe, early-onset vascular disease. Its vascular pathology includes extracellular-matrix abnormalities, fibrosis, collagen accumulation and inflammation. Blood-vessel models have often examined individual vascular compartments in isolation, limiting understanding of how interactions among the vessel wall layers produce disease. The cellular origins of the distinct pathological features and the extent to which they depend directly on the causal mutation remained unresolved.", "question": "How do the different cellular compartments of the vascular wall causally contribute to distinct features of Hutchinson-Gilford progeria vascular pathology?", "finding": "In trilayer engineered blood vessels, HGPS fibroblasts causally promoted extracellular-matrix dysregulation and fibrotic signaling, while HGPS smooth muscle cells drove collagen accumulation and endothelial cells drove inflammation. Correcting the HGPS-associated mutation by base editing restored many pathological characteristics toward healthy levels.", "key_points": [ "Trilayer vessels separated cell-specific causal effects", "Fibroblasts drove matrix dysregulation and fibrotic signaling", "Smooth muscle cells promoted collagen accumulation", "Endothelial cells promoted inflammation", "Mutation correction reversed multiple disease features" ], "hypothesis": "Progerin expression in medial vascular smooth muscle cells (VSMCs) and intimal endothelial cells (ECs) drives distinct pathological features in a strictly cell-autonomous, compartment-specific manner: mutant VSMCs directly generate extracellular-matrix (ECM) abnormalities and collagen accumulation, whereas mutant ECs independently drive vascular inflammation. Neither compartment requires the LMNA mutation in the neighbouring layer to manifest its signature pathology. Mechanism: In the tunica media, progerin-induced nuclear lamina stiffening disrupts LINC-complex mechanotransduction under cyclic stretch, shifting VSMCs from a contractile to a synthetic, profibrotic phenotype with elevated collagen and matrix metalloproteinase production. Concurrently, in the tunica intima, progerin impairs endothelial adaptation to laminar shear stress, directly activating NF-kappaB transcriptional programs and surface adhesion molecules (ICAM-1, VCAM-1) without altering mural matrix synthesis. Prediction: In heterotypic three-dimensional blood-vessel models or lineage-specific mosaic mice, vessels composed of HGPS VSMCs and wild-type ECs will exhibit medial ECM disorganization and collagen accumulation without endothelial inflammatory activation, whereas vessels with HGPS ECs and wild-type VSMCs will display robust intimal inflammation and leukocyte adhesion without medial fibrosis.", "position": 0, "stratum": "selected", "selected": true, "human_score": 3, "judge_scores": [ 3, 3, 4 ], "judge_median": 3, "weight": 2.0 }, { "item": "c2bca67a7f", "id": "claude-opus-5-5|N|R42581103|0", "task": "R42581103", "generator": "claude-opus-5-5", "background": "Intestinal stem-cell function and regenerative capacity decline with age, compromising maintenance and repair of the intestinal epithelium. Both cell-intrinsic changes and signals from the aged systemic environment may contribute to this decline. Chronic inflammation and altered cellular metabolism are common features of ageing, but how circulating conditions are translated into functional defects in intestinal regeneration was unresolved. It was also unclear whether manipulating systemic or metabolic processes could preserve or restore aged stem-cell activity.", "question": "How does the aged systemic environment causally impair intestinal stem-cell metabolism and regenerative function?", "finding": "Age-associated TNF acts as a systemic pro-ageing factor that signals through epithelial TNFR1 to suppress mitochondrial fatty acid oxidation, proliferation and regenerative capacity in intestinal stem cells. Blocking inflammation or TNF–TNFR1 signaling protects or restores ISC function, while enhancing mitochondrial fusion improves the function of aged ISCs.", "key_points": [ "The old systemic environment transfers an ISC ageing phenotype to young mice.", "TNF is a causal pro-ageing inflammatory factor.", "Epithelial TNFR1 is required for the detrimental systemic effect.", "TNF suppresses mitochondrial pathways and fatty acid oxidation.", "Countering inflammation or improving mitochondrial function restores ISC activity." ], "hypothesis": "Circulating pro-inflammatory cytokines from the aged systemic environment (notably IL-6 family / TNF-driven signalling) act directly on intestinal stem cells (ISCs) via JAK–STAT3 activation, rewiring them away from oxidative metabolism and suppressing regenerative proliferation. Blocking this axis in aged mice restores crypt regeneration without changing the systemic milieu itself. Mechanism: Aged plasma cytokines bind receptors on Lgr5+ ISCs and/or adjacent niche cells; chronic STAT3 activation induces a stress/inflammatory transcriptional program that lowers mitochondrial oxidative phosphorylation and fatty-acid oxidation capacity, reducing ATP/acetyl-CoA available for the biosynthetic demands of symmetric self-renewal divisions after injury. Prediction: Heterochronic plasma transfer (aged plasma into young mice) reduces organoid-forming efficiency and post-irradiation crypt survival, and this is abolished by ISC-autonomous Stat3 deletion or receptor-blocking antibody, whereas cytokine-neutralised aged plasma fails to impair young ISCs — distinguishing a direct cytokine-receptor effect from generic nutrient or hormonal differences in aged serum.", "position": 0, "stratum": "unanimous_3", "selected": false, "human_score": 4, "judge_scores": [ 3, 3, 3 ], "judge_median": 3, "weight": 5.533333333333333 }, { "item": "c3fcefad36", "id": "grok-4.5|N|R42605193|0", "task": "R42605193", "generator": "grok-4.5", "background": "Cellular senescence increases with age and can disrupt tissue function through persistent changes in cell state and signaling. Metabolic dysfunction and chronic inflammation are closely associated with this process and with broader age-related deterioration. Circulating factors can coordinate physiological changes across organs, but it remains unclear which factors actively cause senescence rather than merely correlate with ageing. Identifying the responsible signals and their intracellular mechanisms could reveal targets for extending healthspan.", "question": "Which circulating regulator causally promotes cellular senescence and organismal ageing, and through what intracellular signaling mechanism does it act?", "finding": "ANGPTL8 directly interacts with AKT2 and activates the AKT–mTOR–S6K pathway, thereby driving cell-autonomous adipocyte senescence. Deleting Angptl8 in mice reduces adipose senescence, delays age-related functional decline, and extends lifespan, while genetic or pharmacological pathway inhibition abolishes ANGPTL8-induced senescence.", "key_points": [ "ANGPTL8 is a causal pro-senescent regulator", "ANGPTL8 directly interacts with AKT2", "AKT–mTOR–S6K activation drives adipocyte senescence", "Angptl8 deletion improves function and extends mouse lifespan", "Pathway inhibition blocks the pro-senescent effect" ], "hypothesis": "Age-elevated circulating TGF-β1 is a causal driver of multi-tissue cellular senescence and organismal ageing. Chronic exposure of young tissues to aged plasma levels of TGF-β1 is sufficient to induce p16INK4a/p21-positive senescence and accelerate functional decline. Mechanism: Circulating TGF-β1 binds TGFBR1/2, activates Smad2/3–Smad4 complexes that transcriptionally induce CDKN2A/CDKN1A and remodel chromatin toward a stable senescence program, while also reinforcing SASP output that further elevates systemic TGF-β1. Prediction: Neutralizing circulating TGF-β1 (or tissue-specific TGFBR1 deletion) in aged animals will reduce senescence markers across distant organs and improve healthspan metrics more than neutralizing IL-6 or insulin signaling alone; conversely, sustained infusion of TGF-β1 into young animals will recapitulate the aged senescence signature even when inflammatory cytokines remain low.", "position": 0, "stratum": "selected", "selected": true, "human_score": 1, "judge_scores": [ 2, 1, 1 ], "judge_median": 1, "weight": 2.0 }, { "item": "c8891b7415", "id": "gemini-4-argon-high|N|R42663085|0", "task": "R42663085", "generator": "gemini-4-argon-high", "background": "Ageing commonly impairs the cyclical regeneration of hair follicles, contributing to progressive hair thinning and alopecia. Hair growth depends on the orderly transition of follicles from a resting phase into a proliferative growth phase. With age, this transition becomes less efficient as regenerative cells lose functional capacity. Whether this decline can be reversed by directly restoring an intrinsic molecular control of follicle regeneration remained unresolved.", "question": "Can an intrinsic molecular regulator be enhanced to reactivate quiescent hair follicles and restore hair regeneration, and through what mechanism?", "finding": "Increasing TPP1, either through stem-cell Acd overexpression or topical stabilization with the peptide TELODIN, accelerates hair regeneration in mice. TPP1 coordinates telomere capping and telomerase recruitment, activating bulge hair follicle stem cells and promoting their proliferation, differentiation, and migration as follicles transition synchronously from telogen to anagen.", "key_points": [ "TPP1 causally promotes hair regeneration", "TPP1 activates bulge hair follicle stem cells", "Telomere capping and telomerase recruitment mediate the effect", "Follicles transition from telogen to anagen", "Topical TELODIN stabilizes TPP1 and promotes hair growth" ], "hypothesis": "Genetic or pharmacological induction of intrinsic microRNA-205 (miR-205) expression in aged hair follicle stem cells (HFSCs) reactivates quiescent telogen follicles and restores anagen hair regeneration. This reactivation occurs by reversing age-associated cellular stiffening in the bulge and hair germ compartments. Mechanism: miR-205 directly binds and post-transcriptionally represses transcripts encoding RhoA-ROCK pathway activators and actomyosin regulators (including Arhgef11 and Plekhg5), reducing myosin light chain II phosphorylation (p-MLC2) and cortical F-actin polymerization, which lowers intracellular mechanical tension and permits cell-cycle re-entry. Prediction: Atomic force microscopy will show reduced cortical stiffness in aged HFSCs upon miR-205 induction prior to proliferation, and hair regeneration will be phenocopied by ROCK/myosin II inhibition (e.g., blebbistatin) or abolished by expressing miR-205-resistant Arhgef11 without altering upstream BMP or Wnt ligand levels.", "position": 0, "stratum": "selected", "selected": true, "human_score": 1, "judge_scores": [ 2, 2, 0 ], "judge_median": 2, "weight": 2.0 }, { "item": "cb536145e6", "id": "gemini-4-argon-high|N|R42723546|0", "task": "R42723546", "generator": "gemini-4-argon-high", "background": "Chronic ultraviolet exposure causes skin photoaging characterized by impaired barrier function, collagen loss, cellular senescence, and persistent inflammation. Damaged cells can accumulate dysfunctional organelles and release intracellular danger signals that sustain sterile inflammatory responses. Regenerative cell-free therapies have shown potential for repairing aged or injured tissues, but their activity can involve many distinct biological processes. The causal mechanism by which such therapies might suppress photoaging-associated senescence and inflammation remained unresolved.", "question": "Can a cell-free regenerative treatment alleviate UV-induced skin photoaging, and which causal intracellular mechanism mediates its protective effects?", "finding": "Human umbilical cord mesenchymal stem cell secretome protects against UV-induced photoaging by enhancing mitophagy, which clears damaged mitochondria and reduces cytosolic mitochondrial DNA leakage. This suppresses cGAS-STING signaling and downstream inflammatory cytokines; mitophagy inhibition abolishes protection, while STING inhibition restores it.", "key_points": [ "The secretome alleviates UV-induced photoaging and cellular senescence", "Enhanced mitophagy removes damaged mitochondria", "Reduced mitochondrial DNA leakage suppresses cGAS-STING signaling", "Mitophagy inhibition abolishes the protective effect", "STING inhibition rescues protection despite blocked mitophagy" ], "hypothesis": "Cell-free regenerative therapy (such as stem cell-derived extracellular vesicles) alleviates UV-induced skin photoaging by activating PINK1/Parkin-mediated mitophagy to clear damaged mitochondria. This targeted organelle clearance prevents the leakage of mitochondrial DNA (mtDNA) into the cytosol, thereby suppressing activation of the cGAS–STING innate immune pathway and downstream senescence-associated secretory phenotype (SASP) inflammation. Mechanism: Bioactive cargo within the cell-free treatment stimulates PINK1 stabilization and Parkin recruitment to depolarized mitochondria in UV-irradiated keratinocytes and dermal fibroblasts, promoting their autophagic degradation. By eliminating dysfunctional mitochondria before outer membrane permeabilization or mPTP opening can occur, the treatment prevents cytosolic accumulation of oxidized mtDNA, blocking cGAS recognition, 2'3'-cGAMP synthesis, STING/TBK1/IRF3/NF-κB phosphorylation, and the resulting sterile inflammatory and senescent state. Prediction: Genetic depletion of PINK1/Parkin or pharmacological inhibition of mitophagy in UV-exposed skin models will abolish the therapy's ability to reduce cytosolic mtDNA levels, STING phosphorylation, SASP cytokine secretion, and p16/p21 expression, whereas exogenous STING agonists (e.g., DMXAA or cGAMP) will override the protective effects despite intact mitochondrial clearance.", "position": 0, "stratum": "selected", "selected": true, "human_score": 4, "judge_scores": [ 4, 4, 5 ], "judge_median": 4, "weight": 2.0 }, { "item": "ce193a758c", "id": "claude-opus-5-5|N|R42842666|2", "task": "R42842666", "generator": "claude-opus-5-5", "background": "Hutchinson-Gilford progeria syndrome is a premature-ageing disorder caused by an LMNA mutation and is characterized by severe, early-onset vascular disease. Its vascular pathology includes extracellular-matrix abnormalities, fibrosis, collagen accumulation and inflammation. Blood-vessel models have often examined individual vascular compartments in isolation, limiting understanding of how interactions among the vessel wall layers produce disease. The cellular origins of the distinct pathological features and the extent to which they depend directly on the causal mutation remained unresolved.", "question": "How do the different cellular compartments of the vascular wall causally contribute to distinct features of Hutchinson-Gilford progeria vascular pathology?", "finding": "In trilayer engineered blood vessels, HGPS fibroblasts causally promoted extracellular-matrix dysregulation and fibrotic signaling, while HGPS smooth muscle cells drove collagen accumulation and endothelial cells drove inflammation. Correcting the HGPS-associated mutation by base editing restored many pathological characteristics toward healthy levels.", "key_points": [ "Trilayer vessels separated cell-specific causal effects", "Fibroblasts drove matrix dysregulation and fibrotic signaling", "Smooth muscle cells promoted collagen accumulation", "Endothelial cells promoted inflammation", "Mutation correction reversed multiple disease features" ], "hypothesis": "The inflammatory feature of progeroid vasculopathy originates in the endothelium: progerin expression confined to endothelial cells is necessary and largely sufficient for the vessel's inflammatory and leukocyte-adhesive phenotype, independent of medial degeneration or fibrosis. Mechanism: Progerin in endothelial cells disrupts nuclear-lamina-coupled NF-κB and cGAS–STING signalling (via cytosolic DNA from lamina rupture and persistent DNA damage), driving constitutive expression of VCAM-1/ICAM-1/E-selectin, IL-6 and chemokines, plus loss of eNOS-dependent anti-inflammatory tone and barrier integrity. Prediction: Endothelium-restricted progerin produces high adhesion-molecule expression and monocyte capture under flow with intact medial cellularity and normal collagen content, while smooth-muscle- or fibroblast-restricted progerin leaves endothelial activation markers near baseline; inhibition of STING or NF-κB in endothelium normalises leukocyte adhesion without rescuing medial loss.", "position": 2, "stratum": "unanimous_3", "selected": false, "human_score": 2, "judge_scores": [ 3, 3, 3 ], "judge_median": 3, "weight": 5.533333333333333 }, { "item": "ce766f3d00", "id": "gpt-6-astra|N|R42744804|2", "task": "R42744804", "generator": "gpt-6-astra", "background": "Amyotrophic lateral sclerosis is a progressive neurodegenerative disease characterized by motor-neuron loss, neuromuscular denervation and premature death. Inherited SOD1 mutations cause some forms of ALS and are widely used to model disease progression in mice. Degeneration in these models involves interactions between vulnerable neurons and surrounding cells, but it remained unclear which responses actively cause neuronal death rather than merely accompany it. Identifying causal mechanisms could reveal ways to preserve neuromuscular function and extend survival.", "question": "What disease-associated mechanism actively eliminates motor neurons and accelerates mortality in SOD1G93A mice?", "finding": "Microglial Axl and Mer receptors recognize elevated phosphatidylserine on SOD1G93A motor neurons and drive their phagocytic elimination while the neurons are still alive. Germline or microglia-restricted inactivation of Axl and Mertk preserves cholinergic motor neurons and neuromuscular synapses and extends lifespan in SOD1G93A mice.", "key_points": [ "Microglia phagocytically kill living motor neurons", "Axl and Mer are required for this elimination", "Motor-neuron phosphatidylserine provides the eat-me signal", "Axl/Mertk inactivation preserves neurons and neuromuscular synapses", "Blocking the mechanism extends lifespan" ], "hypothesis": "Cytotoxic CD8 T cells recognize disease-associated antigens on motor neurons and directly eliminate them in SOD1G93A mice. This adaptive immune attack accelerates functional decline and death. Mechanism: Motor-neuron MHC class I presentation recruits antigen-dependent CD8 T-cell contact, followed by perforin and granzyme-mediated killing. Prediction: Disrupting MHC class I presentation specifically in motor neurons reduces cytotoxic contacts, neuronal loss and mortality; disrupting perforin in CD8 T cells produces a similar, largely nonadditive benefit.", "position": 2, "stratum": "unanimous_0", "selected": false, "human_score": 1, "judge_scores": [ 2, 1, 1 ], "judge_median": 1, "weight": 51.0 }, { "item": "d0b0b056e2", "id": "claude-opus-5-5|N|R42775695|4", "task": "R42775695", "generator": "claude-opus-5-5", "background": "Cardiac function progressively deteriorates with age, increasing susceptibility to heart failure and other cardiovascular disorders. Defective mitochondrial quality control is considered an important contributor to this decline. Selective removal of damaged mitochondria must remain properly balanced, because disruption at multiple stages of the process can impair cellular homeostasis. The upstream causes of this age-associated defect and whether it can be therapeutically reversed were not well established.", "question": "What causes defective mitochondrial quality-control flux in the aging heart, and how can restoring mitochondrial homeostasis reverse cardiac aging?", "finding": "Age-associated upregulation of HIF-3α drives excessive BNIP3 expression in senescent cardiomyocytes, causing mitophagy flux congestion and cardiac aging. Mitochondrial transplantation restores intracellular ATP homeostasis, restrains pathological HIF-3α–BNIP3 signaling, normalizes mitophagy flux, and rejuvenates the aging heart.", "key_points": [ "HIF-3α is aberrantly elevated with cardiac aging", "HIF-3α directly promotes excessive BNIP3 expression", "Overactive HIF-3α–BNIP3 signaling causes mitophagy flux congestion", "Mitochondrial transplantation restores ATP homeostasis and suppresses the axis", "Normalized mitophagy flux reverses age-related cardiac dysfunction" ], "hypothesis": "Excess mitophagy flux is as pathogenic as deficient flux: the aged heart lies on an inverted-U, and interventions that overdrive mitophagy deplete functional mitochondrial mass and precipitate contractile failure. Restoring homeostasis therefore requires rebalancing coupled mitophagy and biogenesis, not maximizing clearance. Mechanism: Mitophagy and PGC-1α/NRF-driven biogenesis are normally coupled through shared regulators (AMPK, TFEB, PGC-1α). Aging uncouples them: biogenesis capacity falls first, so any pharmacologic or genetic amplification of clearance removes mitochondria that cannot be replaced, lowering OXPHOS capacity and ATP supply in a tissue with minimal metabolic reserve. Benefit occurs only when clearance is restored together with replacement capacity. Prediction: A dose–response study of a mitophagy inducer (urolithin A, spermidine, or graded Parkin/BNIP3 expression) in aged hearts yields a non-monotonic curve: intermediate doses improve function while high doses reduce mitochondrial DNA copy number, citrate synthase activity and ejection fraction. Co-activation of biogenesis shifts the optimum rightward and raises the maximum, whereas under a purely deficient-flux model function should increase monotonically with clearance.", "position": 4, "stratum": "split_2_1", "selected": false, "human_score": 3, "judge_scores": [ 3, 3, 2 ], "judge_median": 3, "weight": 1.8 }, { "item": "d0d17d8b6d", "id": "gpt-6-astra|N|R42805954|0", "task": "R42805954", "generator": "gpt-6-astra", "background": "Ageing is associated with declining thermogenic capacity in adipose tissue, impaired energy expenditure, and increased susceptibility to metabolic dysfunction. Subcutaneous white adipose tissue can acquire heat-producing adipocytes in response to environmental stimuli, but this capacity diminishes with age. Communication between the nervous system and adipose tissue helps regulate this adaptive response. The mechanisms responsible for its age-related deterioration remained incompletely understood.", "question": "What causal mechanism contributes to the age-related decline of thermogenic adipocytes in subcutaneous white adipose tissue?", "finding": "Microglial ALKBH5 suppresses Ntf5 expression by demethylating Ntf5 mRNA, thereby limiting activation of PVH TrkB-positive neurons, sympathetic innervation of subcutaneous white adipose tissue, and adipocyte browning. Microglia-specific ALKBH5 knockout preserved brown adipocytes and improved metabolic activity during ageing in male mice.", "key_points": [ "Microglial ALKBH5 restrains adipocyte browning", "ALKBH5 knockout increases Ntf5 mRNA m6A methylation and Ntf5 expression", "Ntf5 activates PVH TrkB-positive neurons and downstream sympathetic innervation", "Microglia-specific ALKBH5 loss prevents age-related brown adipocyte decline", "The causal findings were demonstrated in male mice" ], "hypothesis": "Ageing reduces neurotrophic support from adipose stromal cells, causing sympathetic axon loss and insufficient norepinephrine delivery to subcutaneous white adipose tissue. This loss of local innervation limits the recruitment and maintenance of thermogenic beige adipocytes. Mechanism: Reduced stromal nerve growth factor production impairs sympathetic terminal maintenance, lowering cold-induced adrenergic stimulation of adjacent adipocytes. Prediction: Restoring stromal nerve growth factor in aged mice restores sympathetic axon density, local norepinephrine release, and cold-induced beige adipocytes; sympathetic denervation abolishes this rescue. Preserved responses to direct beta-adrenergic stimulation would distinguish this mechanism from adipocyte-intrinsic resistance.", "position": 0, "stratum": "split_1_2", "selected": false, "human_score": 2, "judge_scores": [ 3, 2, 2 ], "judge_median": 2, "weight": 2.8 }, { "item": "d22bb2a42f", "id": "claude-opus-5-5|N|R42844664|1", "task": "R42844664", "generator": "claude-opus-5-5", "background": "Cardiovascular ageing is characterized by hypertension, arterial stiffening, endothelial dysfunction, and maladaptive cardiac remodeling. Chronic inflammation, impaired tissue barriers, and regulated inflammatory cell death can accelerate these changes. Dietary patterns can influence age-related cardiovascular health, but causal chains connecting specific eating schedules to vascular protection remain incompletely understood. Identifying the necessary and sufficient mediators of such protection is important for developing non-pharmacological strategies against cardiovascular decline.", "question": "Through what causal mechanism does time-restricted feeding protect against accelerated cardiovascular ageing?", "finding": "Time-restricted feeding enriches acetate-producing Limosilactobacillus, and microbiota-derived acetate is necessary and sufficient for its protection against angiotensin II-induced cardiovascular ageing. Acetate activates GPR43, inhibits HDAC3, increases H4K8 acetylation, and suppresses NLRP3-mediated pyroptosis and cellular senescence.", "key_points": [ "TRF remodels the gut microbiota and enriches Limosilactobacillus", "Microbiota depletion abolishes TRF-mediated cardiovascular protection", "Acetate supplementation restores the protective phenotype", "Acetate signals through GPR43 and inhibits HDAC3", "Increased H4K8ac suppresses NLRP3 pyroptosis and senescence" ], "hypothesis": "Time-restricted feeding protects arteries by suppressing NLRP3-inflammasome-driven gasdermin-D pore formation and pyroptosis in endothelial and perivascular myeloid cells; inflammasome activation is the necessary mediator of the accelerated vascular ageing that TRF prevents. Mechanism: The prolonged daily fast lowers postprandial glycemic excursions, lipotoxic DAMPs and mtROS, raises β-hydroxybutyrate (a direct NLRP3 inhibitor) and induces mitophagy, so ASC-speck assembly, caspase-1 activation and IL-1β/IL-18 release fall; less gasdermin-D pore formation preserves endothelial junction integrity, NO bioavailability and prevents the IL-1β→smooth-muscle osteogenic/fibrotic program that stiffens the wall. Prediction: TRF's protection of endothelium-dependent relaxation, pulse-wave velocity and cardiac remodeling is abolished (no further benefit) in Nlrp3−/−, Casp1−/− or Gsdmd−/− animals — i.e. TRF and inflammasome deletion are epistatic, not additive — and conversely constitutively active NLRP3 (Nlrp3^D301N) blocks TRF benefit despite unchanged feeding rhythm; vascular ASC specks and plasma IL-18 fall before any change in blood pressure.", "position": 1, "stratum": "selected", "selected": true, "human_score": 2, "judge_scores": [ 3, 3, 3 ], "judge_median": 3, "weight": 2.0 }, { "item": "d38fbb3187", "id": "gpt-6-astra|N|R42647119|0", "task": "R42647119", "generator": "gpt-6-astra", "background": "Cellular reprogramming offers a potential way to replace neurons lost through injury or neurodegenerative disease. Most regenerative strategies have been developed and validated in young experimental animals, although advanced age is the principal risk factor for many neurological disorders. Aging can alter both the plasticity of resident cells and the tissue response to injury. It was therefore unclear whether neuronal reprogramming would remain effective in aged neural tissue and which age-associated processes might limit it.", "question": "How does aging affect injury-induced neuronal reprogramming in the retina, and what mechanisms account for any age-related loss of regenerative capacity?", "finding": "Aging suppresses Müller glia-to-neuron reprogramming by preventing activation of progenitor programs while promoting reactive and inflammatory glial states and an exaggerated retinal neuroimmune response. Dexamethasone partially restores neurogenesis, confirming that age-associated inflammation is a causal, therapeutically tractable component of the regenerative defect, alongside glial-intrinsic barriers.", "key_points": [ "Aged Müller glia generate fewer neurons across three reprogramming strategies", "Aged glia fail to activate progenitor programs", "Reactive and inflammatory states increase with age", "The injured aged retina mounts an exaggerated neuroimmune response", "Dexamethasone partially rescues neurogenesis" ], "hypothesis": "Aging reduces injury-induced neuronal reprogramming by making Müller glial chromatin less accessible to proneural transcription factors. This creates a cell-intrinsic barrier to neuronal fate conversion. Mechanism: Age-dependent stabilization of repressive chromatin at neuronal regulatory elements prevents reprogramming factors such as ASCL1 from activating a neurogenic program. Prediction: With injury severity and ASCL1 expression matched, aged Müller glia would show reduced accessibility and ASCL1 occupancy at neuronal enhancers. Targeted reopening of those enhancers would restore lineage-traced neuronal conversion despite an unchanged aged inflammatory environment.", "position": 0, "stratum": "split_2_1", "selected": false, "human_score": 2, "judge_scores": [ 3, 3, 2 ], "judge_median": 3, "weight": 1.8 }, { "item": "d5170d9831", "id": "gemini-4-argon-high|N|R42786310|3", "task": "R42786310", "generator": "gemini-4-argon-high", "background": "Ageing involves coordinated deterioration across metabolic, immune and organ systems, accompanied by changes in host-associated microbial communities. Microbiome composition correlates with biological age and age-related physiological states, but such associations do not establish whether individual microorganisms can modify the ageing process. Some microbial interventions alter host metabolism and longevity in experimental models, although causal effects often depend on organism viability, microbial products and host context. It therefore remained unclear whether systematic integration of diverse human biological measurements could identify a microorganism with experimentally reproducible geroprotective activity.", "question": "Can a commensal microorganism predicted from integrated human ageing profiles causally extend lifespan and healthspan and shift age-associated molecular and microbial states toward younger configurations?", "finding": "Neisseria flavescens was identified as a candidate geroprotective commensal and experimentally shown to extend lifespan and healthspan in Caenorhabditis elegans when administered live. In aged mice, heat-killed N. flavescens shifted the serum metabolome, liver transcriptome and gut microbiome toward younger states, while isolated strains were confirmed to produce predicted beneficial metabolites.", "key_points": [ "Neisseria flavescens is the causal candidate", "Live bacteria extend C. elegans lifespan and healthspan", "Heat-killed bacteria rejuvenate multiple ageing-associated profiles in mice", "Isolated strains produce beneficial metabolites predicted by multi-modality analysis" ], "hypothesis": "A commensal microbe predicted from integrated human biological age signatures causally extends lifespan across evolutionarily conserved model systems by directly modulating host intracellular nutrient-sensing and mitochondrial quality-control pathways. Mechanism: The microorganism alters luminal macronutrient and amino acid bioavailability or delivers conserved metabolic cofactors (such as folate/methionine cycle intermediates or nitric oxide) that inhibit host mTORC1 and insulin/IGF-1 signaling while activating AMPK, FOXO/DAF-16, and mitophagy, shifting systemic metabolism toward a caloric-restriction-like youthful state. Prediction: Administration of the microorganism will fail to extend lifespan or rejuvenate molecular profiles in hosts carrying loss-of-function mutations in AMPK or FOXO/DAF-16 or constitutive mTORC1 activation, and wild-type hosts will exhibit rapid activation of mitochondrial unfolded protein response and autophagic flux prior to community-wide microbiome shifts.", "position": 3, "stratum": "split_1_2", "selected": false, "human_score": 2, "judge_scores": [ 3, 2, 2 ], "judge_median": 2, "weight": 2.8 }, { "item": "d9f0a3faac", "id": "gemini-4-argon-high|N|R42627902|0", "task": "R42627902", "generator": "gemini-4-argon-high", "background": "Ageing alters blood-cell production, commonly shifting lineage output and reducing regenerative balance. These changes can contribute to anemia, impaired immunity, and abnormal clotting in older organisms. Age-related transcriptional and epigenetic remodeling has been implicated, but the regulators that causally connect altered gene programs to lineage imbalance remain incompletely understood. Identifying such regulators could reveal ways to restore healthier blood production during ageing.", "question": "Which regulatory mechanism drives the age-associated shift away from erythroid differentiation and toward platelet-producing lineage programs?", "finding": "Pbx1 is a regulatory hub that drives age-related transcriptional and differentiation changes in hematopoietic stem cells. It suppresses erythroid differentiation by repressing Gata1 expression, thereby contributing to the lineage imbalance characteristic of HSC ageing.", "key_points": [ "Pbx1 is a key regulator of HSC ageing", "Pbx1 represses Gata1 expression", "Pbx1 suppresses erythroid differentiation", "The mechanism contributes to age-related lineage imbalance" ], "hypothesis": "Age-associated upregulation and chromatin pioneering of the transcription factor FLI1 in hematopoietic stem and megakaryocyte-erythroid progenitor cells (MEPs) directly activates platelet-lineage gene programs while competitively repressing KLF1-driven erythroid differentiation. This shift in the FLI1-to-KLF1 transcriptional balance causally redirects bipotent progenitors and stem cells toward megakaryocytopoiesis during ageing. Mechanism: During ageing, increased accessibility at ETS-family binding motifs allows FLI1 (in cooperation with RUNX1 and GATA2) to occupy and activate megakaryocytic enhancers (such as MPL, ITGA2B, and GP1BA) while physically sequestering GATA1 away from KLF1 and recruiting corepressors to erythroid-specific loci (such as EPOR and HBB), thereby blocking erythroid commitment and promoting direct megakaryocyte generation. Prediction: Single-cell ATAC/RNA-seq of aged HSCs and MEPs will show selective enrichment of open FLI1/ETS motifs prior to lineage commitment, and partial genetic knockdown or degron-mediated reduction of FLI1 in aged progenitors will restore KLF1 target gene expression and normalize the erythroid-to-platelet output ratio even in the presence of an aged inflammatory bone marrow niche.", "position": 0, "stratum": "selected", "selected": true, "human_score": 2, "judge_scores": [ 2, 2, 2 ], "judge_median": 2, "weight": 2.0 }, { "item": "dba3d6a0de", "id": "gpt-6-astra|N|R42806572|0", "task": "R42806572", "generator": "gpt-6-astra", "background": "Senescent cells accumulate with age and can promote tissue dysfunction through persistent inflammatory and remodeling signals. Experimental removal of these cells can improve several age-related phenotypes, supporting cellular senescence as a causal contributor to declining health. Immune-mediated senolysis offers a way to eliminate selected senescent cells, but differences between therapeutic and toxic exposure can complicate translation. A major open problem is whether an externally controllable treatment can achieve effective senolysis in both rodents and primates while providing a practical marker of emerging toxicity.", "question": "Can a dose-titratable immune engager safely eliminate senescent cells and alleviate age-related pathology across mice and non-human primates, and what measurement can guide its safe dosing?", "finding": "A GFD-CD3 bispecific T-cell engager targeting uPAR-positive senescent cells caused dose-dependent senolysis and alleviated age-related pathologies in aged mice and non-human primates at low doses. High doses caused hepatotoxicity through T-cell attack on hepatic endothelial cells, while serum aminotransferase monitoring enabled dosing that retained senolytic efficacy without observed adverse effects.", "key_points": [ "GFD-CD3 targets uPAR-positive senescent cells", "Low-dose treatment produces senolysis in mice and non-human primates", "Senolysis alleviates age-related pathologies", "High-dose toxicity results from T-cell attack on hepatic endothelial cells", "Serum aminotransferase activity provides a safety monitor for dose titration" ], "hypothesis": "A soluble uPAR×CD3 bispecific immune engager can selectively eliminate uPAR-high senescent cells in aged mice and non-human primates within an exposure range that spares essential nonsenescent cells. Mechanism: Simultaneous binding to uPAR on target cells and CD3 on T cells triggers cytotoxic synapses preferentially above a target-antigen density threshold. Dose titration exploits a proposed difference in uPAR density between senescent cells and healthy tissues. Prediction: Both species show an exposure interval with loss of independently verified senescent cells and preserved healthy tissue function. Target blockade or a CD3-binding-deficient engager abolishes killing; equivalent killing of uPAR-low healthy cells would contradict the proposed selectivity.", "position": 0, "stratum": "unanimous_3", "selected": false, "human_score": 3, "judge_scores": [ 3, 4, 3 ], "judge_median": 3, "weight": 5.533333333333333 }, { "item": "e1b6fb5f4d", "id": "gemini-4-argon-high|N|R42608398|0", "task": "R42608398", "generator": "gemini-4-argon-high", "background": "Idiopathic pulmonary fibrosis is a progressive, age-associated disorder characterized by recurring tissue injury and excessive fibrotic remodeling. Abnormal cell-fate programs, including apoptosis, senescence, and phenotypic transitions, are thought to contribute to disease progression. Changes in the lung microbiota have also been associated with disease severity, but association alone has not established a direct pathogenic mechanism. It remained unclear whether a microbiota-derived product could independently initiate the cellular dysfunction and progressive fibrosis observed in this disease.", "question": "Can a microbiota-derived factor directly cause the cellular dysfunction and progressive tissue remodeling characteristic of idiopathic pulmonary fibrosis, and if so, through what mechanism?", "finding": "The microbiota-derived peptide corisin directly disrupts epithelial proteostasis by targeting and enhancing the ubiquitin-proteasome system, thereby inducing apoptosis, cellular senescence, epithelial-mesenchymal transition, and fibrotic remodeling. Depleting native corisin from patient bronchoalveolar lavage fluid removes its proapoptotic activity, while constitutive corisin expression in mice causes spontaneous progressive pulmonary fibrosis and worsens bleomycin-induced injury and mortality.", "key_points": [ "Corisin is present and functionally active in bronchoalveolar lavage fluid from patients with idiopathic pulmonary fibrosis.", "Corisin enters epithelial cells, localizes to mitochondria, and induces apoptosis, senescence, and epithelial-mesenchymal transition.", "Corisin enhances proteasome activity and disrupts epithelial proteostasis.", "Removing corisin abolishes the proapoptotic activity of patient lavage fluid.", "Native corisin expression is sufficient to cause progressive pulmonary fibrosis in mice." ], "hypothesis": "A conserved pro-apoptotic peptide proteolytically cleaved from bacterial cell-wall transglycosylases (such as corisin derived from lung-resident Staphylococcus and related commensal bacteria) directly initiates progressive pulmonary fibrosis without requiring live infection. This microbiota-derived peptide acts on alveolar epithelial cells to simultaneously trigger apoptosis, cellular senescence, and epithelial-to-mesenchymal phenotypic transitions. Mechanism: Extracellular bacterial serine proteases cleave conserved regions of bacterial transglycosylases to release a bioactive peptide into the alveolar space. Upon internalization or receptor engagement on alveolar type II (AT2) epithelial cells, the peptide disrupts mitochondrial membrane potential and increases mitochondrial reactive oxygen species, triggering intrinsic caspase-3-mediated apoptosis in a subset of cells while activating ATM/p53/p21 DNA damage signaling, senescence-associated secretory phenotype (SASP) release, and TGF-beta1/SMAD- and Snail-mediated epithelial-to-mesenchymal transition (EMT) in surviving cells to drive myofibroblast accumulation and extracellular matrix deposition. Prediction: Intratracheal instillation of the purified synthetic bacterial peptide alone into uninjured mice will be sufficient to induce AT2 apoptosis, p21/SA-beta-gal-positive senescence, EMT marker expression, and progressive collagen deposition, whereas protease-resistant removal of peptidic factors or treatment with a peptide-neutralizing monoclonal antibody will completely abolish these cell-fate abnormalities and fibrotic remodeling.", "position": 0, "stratum": "selected", "selected": true, "human_score": 4, "judge_scores": [ 3, 3, 4 ], "judge_median": 3, "weight": 2.0 }, { "item": "e282ea7a22", "id": "grok-4.5|N|R42810392|4", "task": "R42810392", "generator": "grok-4.5", "background": "Ageing is strongly influenced by conserved systems that coordinate cellular metabolism with nutrient and energy availability. Genetic studies have shown that altering metabolic regulation can affect lifespan in several model organisms. Pharmacological studies, however, often use compounds with multiple targets, making it difficult to attribute longevity effects to a specific mechanism. It therefore remained unclear whether selective engagement of a single conserved metabolic target could directly produce longevity benefits across species.", "question": "Can direct pharmacological activation of a conserved metabolic target extend lifespan across evolutionarily diverse organisms and induce longevity-associated changes in mammals?", "finding": "Direct pharmacological activation of AMPK with compound 991 extends lifespan in Drosophila melanogaster, Caenorhabditis elegans, and Schizosaccharomyces pombe. In mice, 991 induces a proteomic profile associated with pro-longevity biology, supporting the translational potential of AMPK activation.", "key_points": [ "Direct AMPK activation by compound 991", "Lifespan extension in yeast, worms, and flies", "Conserved causal longevity effect across species", "Pro-longevity proteomic response in mice" ], "hypothesis": "Direct activation of the conserved metabolic target produces true longevity benefits in mammals only when it induces tissue-specific metabolic remodeling (improved insulin sensitivity, reduced ectopic lipid, enhanced autophagy) that parallels genetic longevity models; invertebrate lifespan extension alone is insufficient evidence of a conserved anti-aging mechanism. Mechanism: Systemic AMPK activation rewires nutrient handling in liver, adipose, and skeletal muscle, lowering chronic nutrient-sensing stress and aligning mammalian physiology with states seen in calorie restriction and long-lived mutants. Prediction: Treated mammals will show measurable longevity-associated changes—improved glucose homeostasis, CR-like hepatic and muscle transcriptomes, and delayed aging biomarkers—correlated with on-target engagement; compounds that extend worm/fly lifespan without these mammalian changes will be classified as non-conserved or off-pathway.", "position": 4, "stratum": "unanimous_3", "selected": false, "human_score": 3, "judge_scores": [ 3, 3, 3 ], "judge_median": 3, "weight": 5.533333333333333 }, { "item": "e40831ff67", "id": "claude-opus-5-5|N|R42858183|1", "task": "R42858183", "generator": "claude-opus-5-5", "background": "Aging is accompanied by declining lysosomal activity, impaired autophagic clearance, and loss of protein homeostasis. These changes contribute to progressive functional deterioration and increase vulnerability to protein-aggregation disorders. Restoring cellular clearance systems can sometimes improve lifespan or healthspan in model organisms. However, interventions that preserve lysosomal competence during aging and the mechanisms through which they act remain incompletely understood.", "question": "Can a defined intervention preserve lysosomal function and protein homeostasis during aging, thereby extending lifespan and maintaining organismal function, and through what mechanism?", "finding": "20(S)-ginsenoside Rg3 extended lifespan and preserved physiological and neuronal function in Caenorhabditis elegans by restoring lysosomal activity and autophagic flux. Rg3 remodeled neuronal lysosomal phosphoinositide signatures toward increased PI(4)P and reduced PI(3)P, suppressed RSKS-1/S6K–TORC1 signaling, and promoted nuclear HLH-30/TFEB activity, thereby improving proteostasis and resistance to polyglutamine- and α-synuclein-associated toxicity.", "key_points": [ "Rg3 extends lifespan and preserves healthspan", "Lysosomal function and autophagic flux are restored during aging", "Neuronal phosphoinositides shift toward higher PI(4)P and lower PI(3)P", "TORC1–RSKS-1/S6K signaling is suppressed and HLH-30/TFEB enters the nucleus", "Protein aggregation and neurodegeneration are reduced" ], "hypothesis": "Pulsed rather than continuous activation of the master lysosomal transcription factor TFEB/HLH-30 preserves lysosomal competence across aging, because continuous activation exhausts the biogenesis–degradation cycle. Intermittent (e.g. 12 h on / 36 h off) adult-onset TFEB induction extends lifespan and maintains motor function more than constitutive induction at matched total dose. Mechanism: TFEB drives the CLEAR gene network; cyclical nuclear entry permits a biogenesis phase followed by a degradative/mTORC1-reactivation phase in which newly made lysosomes are loaded, acidified and reformed (autophagic lysosome reformation). Continuous nuclear TFEB uncouples biogenesis from reformation, producing immature, poorly acidified lysosomes and ER/secretory stress. Prediction: At equal cumulative TFEB induction, pulsed animals show higher cathepsin activity per lysosome, normal lysosome size distribution and preserved ALR (spinning-disk tubulation events), and a larger lifespan extension, whereas constitutive animals accumulate enlarged pale lysosomes and show no or reduced extension; swapping the pulse period to match the ALR timescale should maximize the effect.", "position": 1, "stratum": "split_1_2", "selected": false, "human_score": 2, "judge_scores": [ 3, 2, 2 ], "judge_median": 2, "weight": 2.8 }, { "item": "e50796041e", "id": "grok-4.5|N|R42775698|0", "task": "R42775698", "generator": "grok-4.5", "background": "Intestinal structure and barrier integrity commonly deteriorate with age, contributing to altered nutrient handling, inflammation, and systemic metabolic dysfunction. Ageing is also accompanied by changes in circulating metabolites and intestinal gene expression. Observational studies have linked these features, but such associations cannot establish whether age-related changes in the intestinal ecosystem actively cause host dysfunction. The mechanisms connecting donor age-associated biological states to impaired intestinal physiology therefore remained unclear.", "question": "Can age-associated differences in the human gut microbial community causally reprogram intestinal barrier function, systemic metabolism, and mucosal gene expression, and what mediators contribute to these effects?", "finding": "Transplanting elderly-human gut microbiota into pigs caused reduced ileal villus height, loss of tight-junction proteins, altered plasma metabolites, and coordinated suppression of seven ileal mucosal antiviral-response hub genes compared with young-donor microbiota. The elderly-donor-associated metabolic shift was functionally linked to barrier impairment: Tyr-Phe increased epithelial electrical resistance, whereas prostaglandin E3 decreased it in IPEC-1 cells.", "key_points": [ "Elderly-donor microbiota causally impaired intestinal architecture and tight-junction integrity", "Elderly-donor transplantation reshaped the plasma metabolome", "Tyr-Phe strengthened and prostaglandin E3 weakened epithelial barrier function experimentally", "Seven mucosal hub genes were consistently downregulated after elderly-donor transplantation", "Blautia obeum enrichment was associated with the elderly-donor metabolic and barrier phenotype" ], "hypothesis": "Transplantation of gut microbiota from older human donors into germ-free or antibiotic-treated young recipient animals causally impairs intestinal epithelial barrier integrity relative to microbiota from young donors. This effect is driven by enrichment of age-associated taxa that reduce mucus thickness and tight-junction protein expression. Mechanism: Age-enriched mucin-degrading and pro-inflammatory taxa deplete mucus and downregulate occludin, claudin-1, and ZO-1, increasing paracellular permeability. Prediction: Older-donor microbiota recipients show higher FITC-dextran flux and lower tight-junction protein levels than young-donor recipients; co-colonization or selective depletion of candidate mucin degraders abolishes the barrier defect while matched metabolite profiles without those taxa do not.", "position": 0, "stratum": "unanimous_3", "selected": false, "human_score": 2, "judge_scores": [ 3, 4, 3 ], "judge_median": 3, "weight": 5.533333333333333 }, { "item": "f23ad0f003", "id": "claude-opus-5-5|N|R42669067|0", "task": "R42669067", "generator": "claude-opus-5-5", "background": "Cellular senescence is an irreversible growth-arrest state that contributes to ageing and age-related pathology. Senescent cells undergo changes in genome organization and can activate normally repressed repetitive DNA elements. Such activation may compromise genome stability and provoke inflammatory signaling. The regulatory mechanisms that preserve repeat silencing and thereby limit senescence remained incompletely understood.", "question": "How does SIRT1 regulate L1 retrotransposon activity, and does this regulation affect cellular senescence?", "finding": "SIRT1 suppresses L1 transcription and retrotransposition by promoting the association and recruitment of Lamin B1 and KAP1 at the L1 5′-UTR, increasing repressive H3K9me3 chromatin. SIRT1 deficiency derepresses L1, activates cGAS–STING signaling, and induces cellular senescence; reverse-transcriptase inhibition with 3TC rescues this phenotype.", "key_points": [ "SIRT1 represses L1 transcription and retrotransposition", "SIRT1 stabilizes Lamin B1–KAP1 interactions at the L1 5′-UTR", "The mechanism increases repressive H3K9me3 chromatin", "SIRT1 loss activates L1-dependent cGAS–STING signaling and senescence", "3TC rescues senescence caused by SIRT1 deficiency" ], "hypothesis": "SIRT1 is a direct repressor of L1 retrotransposons: it is recruited to L1 5'UTR promoter regions and deacetylates histone H4K16 (and H3K9/H3K56) there, maintaining a closed chromatin state. Loss or decline of SIRT1 during ageing de-represses L1 transcription, and this de-repression is itself sufficient to accelerate the onset of cellular senescence. Mechanism: SIRT1 occupies the L1 5'UTR, removes H4K16ac, and enables SUV39H1/HP1-dependent H3K9 methylation and heterochromatin compaction over young, full-length L1 loci. Reduced SIRT1 activity (lower NAD+, SIRT1 protein loss, or its known relocalization away from repeats after DNA damage) leaves H4K16ac high, opens the promoter, and allows RNA Pol II to transcribe L1, generating ORF1p/ORF2p and cytoplasmic L1 cDNA. Prediction: SIRT1 ChIP shows enrichment at L1 5'UTRs in proliferating cells that is lost in senescent cells; SIRT1 knockdown raises L1 5'UTR H4K16ac and L1 RNA/ORF1p and triggers premature senescence markers (SA-β-gal, p16, p21), while SIRT1 overexpression or a deacetylase-dependent rescue (not the H363Y catalytic mutant) restores silencing and delays senescence. Critically, blocking L1 downstream of SIRT1 loss — L1 ASOs, ORF2p-targeting shRNA, or reverse-transcriptase inhibitors such as lamivudine — prevents the senescence acceleration without restoring SIRT1 activity, placing L1 causally downstream.", "position": 0, "stratum": "selected", "selected": true, "human_score": 4, "judge_scores": [ 3, 3, 3 ], "judge_median": 3, "weight": 2.0 }, { "item": "f5c617b7fb", "id": "claude-opus-5-5|N|R42749700|0", "task": "R42749700", "generator": "claude-opus-5-5", "background": "Hutchinson–Gilford progeria syndrome is a rare genetic disorder characterized by accelerated ageing and markedly shortened lifespan. Cells affected by the disease develop nuclear abnormalities, loss of chromatin organization, and premature senescence. Senescent cells can reinforce tissue dysfunction by releasing pro-inflammatory factors collectively known as the senescence-associated secretory phenotype. The molecular mechanisms connecting altered nuclear architecture to this secretory state remained incompletely understood, limiting the development of mechanism-based treatments.", "question": "What molecular mechanism links disrupted chromatin regulation to cellular senescence in Hutchinson–Gilford progeria syndrome, and can targeting that mechanism ameliorate disease phenotypes and extend lifespan?", "finding": "HMGA1 recruits the deubiquitinase USP7 to stabilize HP1β, which reduces chromatin accessibility at ANGPTL2 and suppresses senescence-associated secretory factors, thereby alleviating HGPS cellular senescence. An HMGA1-derived peptide, UHP, prevents HP1β degradation, reduces senescence, and significantly extends the lifespan of LmnaG609G/G609G mice.", "key_points": [ "HMGA1 stabilizes HP1β through USP7 recruitment", "HP1β closes chromatin at ANGPTL2", "ANGPTL2 and SASP expression are suppressed", "The effect on senescence depends on HP1β", "UHP reduces senescence and extends progeria-mouse lifespan" ], "hypothesis": "In HGPS, progerin-driven loss of heterochromatin de-represses the NAD+-consuming enzyme CD38 (and related NADase programs), depleting nuclear and mitochondrial NAD+; the resulting loss of SIRT1/SIRT6 activity disables DNA-damage repair and PGC-1α-dependent mitochondrial maintenance, locking cells into senescence with a strong SASP. Restoring NAD+ (NMN/NR or CD38 inhibition) should reduce senescence markers and extend lifespan in Lmna G609G mice. Mechanism: Heterochromatin loss (H3K9me3/HP1/LAP2α decline) at NADase and inflammatory loci → CD38 up-regulation → NAD+ depletion → reduced SIRT6-dependent double-strand-break repair and SIRT1-dependent PGC-1α deacetylation → persistent DNA damage foci + mitochondrial ROS → p16/p21 senescence and NF-κB-driven SASP. Prediction: Tissue NAD+ in G609G mice falls before senescence markers rise, and CD38 knockout or NAD+ precursor dosing started pre-symptomatically restores H3K9me3-independent repair capacity, lowers IL-6/CXCL1, and extends median lifespan ≥15%; a sirtuin-dead (Sirt6 catalytic mutant) background abolishes the rescue, distinguishing this from generic antioxidant effects.", "position": 0, "stratum": "unanimous_0", "selected": false, "human_score": 2, "judge_scores": [ 2, 2, 2 ], "judge_median": 2, "weight": 51.0 }, { "item": "fc30f8c449", "id": "gpt-6-astra|N|R42642518|1", "task": "R42642518", "generator": "gpt-6-astra", "background": "Biological ageing progresses at different rates among individuals and is associated with broad changes in physiology and chronic-disease risk. Women and men can follow different ageing trajectories, particularly during midlife, but the biological basis and functional significance of these differences remain incompletely understood. Large clinical datasets can identify circulating features that change with age, although association alone cannot establish whether such features actively promote ageing. Experimental validation is therefore needed to distinguish causal contributors from passive biomarkers.", "question": "Which circulating factors that accumulate with age actively induce ageing-related cellular phenotypes, and is their resulting biological burden reversible?", "finding": "Age-associated accumulation of metabolic factors, including low-density lipoprotein, triglycerides, glucose and uric acid, and tumor markers, including carcinoembryonic antigen and human epididymis protein 4, induced senescence-related phenotypes in human endothelial cells. A high-fat-diet mouse model followed by dietary reversal further showed that ageing associated with metabolic burden is modifiable.", "key_points": [ "Specific metabolic and tumor markers accumulate with age", "The identified circulating factors induce senescence-related phenotypes", "Causality was tested in human endothelial cells", "Dietary reversal in mice supports modifiability of metabolic burden-induced ageing", "Ageing trajectories differ by sex during midlife" ], "hypothesis": "Circulating oxidized LDL that increases with age actively drives vascular cellular ageing through LOX-1 signaling. Its removal reverses endothelial dysfunction before stable senescence develops. Mechanism: Oxidized LDL activates LOX-1-dependent oxidative stress, reduces nitric oxide availability, and triggers DNA damage and inflammatory signaling. Prediction: Selective oxidized-LDL depletion from older-donor plasma restores endothelial nitric oxide production and reduces persistent senescence after exposure; add-back at the original concentration reinstates both effects. Native LDL matched for particle number does not reproduce the phenotype, and LOX-1 disruption prevents it.", "position": 1, "stratum": "split_2_1", "selected": false, "human_score": 3, "judge_scores": [ 3, 3, 2 ], "judge_median": 3, "weight": 1.8 }, { "item": "fe26f335f3", "id": "claude-opus-5-5|N|R42811065|4", "task": "R42811065", "generator": "claude-opus-5-5", "background": "Chronic stress can disrupt bone remodeling and promote osteoporosis through sustained sympathetic nervous system activity. Cellular senescence within the bone marrow microenvironment can impair regenerative functions and contribute to reduced bone formation. Neural and endocrine signals are therefore plausible links between psychological stress and deterioration of skeletal health. However, the local mediator responsible for stress-induced senescence and the mechanism by which peripheral stimulation could restore osteogenesis were unresolved.", "question": "Which local mechanism connects stress-induced sympathetic activity to cellular senescence and impaired osteogenesis, and can it be modulated non-invasively?", "finding": "Sympathetic neuropeptide Y drives stress-induced osteoporosis by activating adipocyte Y1R and inducing senescence in bone marrow adipocytes, which impairs osteogenesis. Pulsed electromagnetic fields activate sensory nerves, causing local semaphorin 3A release that suppresses sympathetic neuropeptide Y secretion through a peripheral circuit independent of central pathways.", "key_points": [ "Sympathetic neuropeptide Y is causally required for stress-induced bone loss", "Neuropeptide Y induces senescence in bone marrow adipocytes through Y1R", "Adipocyte senescence impairs osteogenesis", "Pulsed electromagnetic fields activate sensory nerve-dependent semaphorin 3A release", "Semaphorin 3A locally suppresses sympathetic neuropeptide Y secretion" ], "hypothesis": "Sympathetic hyperactivity impairs osteogenesis not by killing osteoprogenitors but by senescence-driven lineage reallocation: senescent BMSCs switch to adipogenic and osteoclast-supportive output (RANKL-high, adiponectin/PPARγ-high), so the decisive local mechanism is a senescence-dependent fate switch that is reversible by senolytic or senomorphic intervention combined with peripheral neurostimulation. Mechanism: β-adrenergic/cAMP-induced senescence stabilizes a PPARγ-permissive, Wnt-low chromatin state (increased Sost/Dkk1, reduced β-catenin) in BMSCs → marrow adiposity and RANKL-mediated resorption rise while matrix deposition falls; clearing or silencing these senescent cells restores Wnt responsiveness, and neurostimulation prevents their re-formation. Prediction: Senolytic treatment (dasatinib+quercetin or p16-INK-ATTAC clearance) in stressed mice reverses marrow adiposity and restores bone formation rate, but bone loss recurs when stress continues after senolysis — unless taVNS/β-blockade is co-applied; single-cell profiling of marrow stroma shows the p16-high cluster carrying the adipogenic/RANKL-high signature, which disappears with either intervention.", "position": 4, "stratum": "unanimous_0", "selected": false, "human_score": 2, "judge_scores": [ 2, 2, 2 ], "judge_median": 2, "weight": 51.0 } ], "reference_checks": [ { "item": "5beb15e031", "order": 1, "task": "R42601407", "pmid": "42601407", "doi": "10.1038/s43587-026-01177-0", "title": "Physical activity delays ovarian aging in part through adiponectin-related signaling pathways.", "finding": "Physical activity delays ovarian ageing in mice partly by increasing ovarian adiponectin signaling. Its protective effects were attenuated in adiponectin-deficient mice, while pharmacological activation of adiponectin receptors with AdipoRon delayed ovarian ageing and extended reproductive lifespan.", "key_points": [ "Physical activity delays ovarian ageing in mice", "Physical activity increases ovarian adiponectin levels", "Adiponectin deficiency attenuates the protective effect", "AdipoRon delays ovarian ageing", "AdipoRon extends reproductive lifespan" ], "score": 3, "source_basis": "abstract", "source_audit": null }, { "item": "8a3e43623d", "order": 2, "task": "R42775698", "pmid": "42775698", "doi": "10.1111/acel.70725", "title": "Transplantation of Elderly Human Gut Microbiota Into Pigs Reprograms Intestinal Barrier Function, Plasma Metabolome, and Gut Mucosal Transcriptomic Landscape.", "finding": "Transplanting elderly-human gut microbiota into pigs caused reduced ileal villus height, loss of tight-junction proteins, altered plasma metabolites, and coordinated suppression of seven ileal mucosal antiviral-response hub genes compared with young-donor microbiota. The elderly-donor-associated metabolic shift was functionally linked to barrier impairment: Tyr-Phe increased epithelial electrical resistance, whereas prostaglandin E3 decreased it in IPEC-1 cells.", "key_points": [ "Elderly-donor microbiota causally impaired intestinal architecture and tight-junction integrity", "Elderly-donor transplantation reshaped the plasma metabolome", "Tyr-Phe strengthened and prostaglandin E3 weakened epithelial barrier function experimentally", "Seven mucosal hub genes were consistently downregulated after elderly-donor transplantation", "Blautia obeum enrichment was associated with the elderly-donor metabolic and barrier phenotype" ], "score": 2, "source_basis": "full_text", "source_audit": null }, { "item": "d486024e5b", "order": 3, "task": "R42811497", "pmid": "42811497", "doi": "10.1111/acel.70738", "title": "Targeting Ero1L by Parthenolide Alleviates Cellular Senescence and Fibrosis of Localized Scleroderma by Regulating Mitochondria-Associated Endoplasmic Reticulum Membranes Stabilization.", "finding": "Parthenolide suppresses Ero1L, thereby normalizing Ero1L-mediated mitochondria-associated endoplasmic reticulum membrane function, regulating the IP3R1/Grp75/VDAC1 complex, and reducing mitochondrial damage, cellular senescence, and fibrosis. Ero1L overexpression reverses these protective effects, whereas Ero1L knockdown reproduces the anti-senescent and antifibrotic phenotype; ARG-449 is critical for parthenolide binding to Ero1L.", "key_points": [ "Ero1L causally promotes senescence and fibrosis", "Parthenolide directly suppresses Ero1L through binding involving ARG-449", "The mechanism involves MAM stabilization and the IP3R1/Grp75/VDAC1 complex", "Ero1L gain- and loss-of-function experiments establish causality", "Targeting this axis reduces mitochondrial damage and fibrotic pathology" ], "score": 2, "source_basis": "full_text", "source_audit": null }, { "item": "824356a084", "order": 4, "task": "R42821663", "pmid": "42821663", "doi": "10.1126/science.aed8207", "title": "Hypertension fuels osteoarthritis through neuroendocrine signaling.", "finding": "Hypertension-associated circulating arginine vasopressin activates up-regulated AVPR1A in osteoarthritis-primed chondrocytes, driving NR4A3-dependent catabolic signaling and suppressing anabolic regulation. Genetic deletion or pharmacological inhibition of AVPR1A prevents the hypertension-induced acceleration of osteoarthritis.", "key_points": [ "Hypertension elevates osteoarthritis progression", "OA-primed chondrocytes up-regulate AVPR1A", "Circulating AVP activates AVPR1A", "NR4A3 mediates the downstream catabolic program", "AVPR1A disruption protects cartilage" ], "score": 3, "source_basis": "abstract", "source_audit": null }, { "item": "853f69641f", "order": 5, "task": "R42858183", "pmid": "42858183", "doi": "10.1111/acel.70755", "title": "Ginsenoside Rg3 Promotes Healthy Aging Through Phosphoinositide-Associated Lysosomal Regulation in Caenorhabditis elegans.", "finding": "20(S)-ginsenoside Rg3 extended lifespan and preserved physiological and neuronal function in Caenorhabditis elegans by restoring lysosomal activity and autophagic flux. Rg3 remodeled neuronal lysosomal phosphoinositide signatures toward increased PI(4)P and reduced PI(3)P, suppressed RSKS-1/S6K–TORC1 signaling, and promoted nuclear HLH-30/TFEB activity, thereby improving proteostasis and resistance to polyglutamine- and α-synuclein-associated toxicity.", "key_points": [ "Rg3 extends lifespan and preserves healthspan", "Lysosomal function and autophagic flux are restored during aging", "Neuronal phosphoinositides shift toward higher PI(4)P and lower PI(3)P", "TORC1–RSKS-1/S6K signaling is suppressed and HLH-30/TFEB enters the nucleus", "Protein aggregation and neurodegeneration are reduced" ], "score": 2, "source_basis": "full_text", "source_audit": null }, { "item": "4f28426966", "order": 6, "task": "R42696595", "pmid": "42696595", "doi": "10.1126/sciadv.aeg8609", "title": "Natural variation in SL6 determines fatty acid components and seed longevity in rice.", "finding": "Natural variation at qSL6 causally determines rice seed longevity through SL6, a fatty acyl-ACP thioesterase that changes seed fatty-acid composition and increases resistance to oxidation. Desiccation-induced ABA signaling activates SL6 through VP1, while a virus-derived CT-rich element in the 5′ UTR of the ancestral SL6HHZ allele stabilizes its mRNA bidirectionally and contributes to longevity differences between indica and japonica rice.", "key_points": [ "qSL6 encodes the causal fatty acyl-ACP thioesterase SL6", "SL6 alters palmitic-acid synthesis and seed fatty-acid composition", "The ABA–VP1 module directly activates SL6 during seed desiccation", "A CT-rich 5′-UTR element stabilizes SL6HHZ mRNA", "Increasing SL6 expression improves seed longevity without major agronomic penalties" ], "score": 2, "source_basis": "full_text", "source_audit": null }, { "item": "ad416798df", "order": 7, "task": "R42758848", "pmid": "42758848", "doi": "10.1126/sciadv.aee8251", "title": "Epigenetic training licenses naïve CD8+ T cell metabolic fitness and function.", "finding": "Tonic IL-7 signaling establishes a GABPα-dependent program that deposits H2A.Z at oxidative-phosphorylation gene promoters in quiescent naïve CD8+ T cells, priming their rapid metabolic and functional activation. Age-related loss of IL-7 signaling reduces H2A.Z occupancy and impairs activation, while IL-7 supplementation or enforced H2A.Z expression rescues the defect.", "key_points": [ "Ageing reduces tonic IL-7 signaling", "GABPα regulates H2A.Z deposition", "H2A.Z primes OXPHOS gene promoters", "Loss of this axis impairs naïve CD8+ T-cell activation", "IL-7 or H2A.Z restoration rescues the age-related defect" ], "score": 3, "source_basis": "full_text", "source_audit": null }, { "item": "2915fc9c99", "order": 8, "task": "R42630044", "pmid": "42630044", "doi": "10.1111/acel.70687", "title": "Piezo1 Activation Rescues Anabolic Response to Mechanical Loading in Aged Bone via Connexin 43 Hemichannels.", "finding": "In aged mouse bone, activation of Piezo1 during mechanical loading promotes its membrane co-localization with connexin 43 and increases connexin 43 hemichannel activity through PI3K-Akt signaling. Hemichannel opening increases PGE2 release, suppresses sclerostin, promotes endosteal bone formation, inhibits resorption, and thereby restores the cortical anabolic response to loading.", "key_points": [ "Piezo1 activation must accompany mechanical loading to rescue aged bone", "Piezo1 interacts and co-localizes with connexin 43", "PI3K-Akt signaling activates connexin 43 hemichannels", "Hemichannel opening increases PGE2 and suppresses sclerostin", "The pathway increases cortical bone mass by favoring formation over resorption" ], "score": 3, "source_basis": "full_text", "source_audit": null }, { "item": "9d5ea9d400", "order": 9, "task": "R42844664", "pmid": "42844664", "doi": "10.1111/acel.70728", "title": "Time-Restricted Feeding Delays Cardiovascular Aging by Increasing Acetic Acid Through Remodeling Gut Microbiota.", "finding": "Time-restricted feeding enriches acetate-producing Limosilactobacillus, and microbiota-derived acetate is necessary and sufficient for its protection against angiotensin II-induced cardiovascular ageing. Acetate activates GPR43, inhibits HDAC3, increases H4K8 acetylation, and suppresses NLRP3-mediated pyroptosis and cellular senescence.", "key_points": [ "TRF remodels the gut microbiota and enriches Limosilactobacillus", "Microbiota depletion abolishes TRF-mediated cardiovascular protection", "Acetate supplementation restores the protective phenotype", "Acetate signals through GPR43 and inhibits HDAC3", "Increased H4K8ac suppresses NLRP3 pyroptosis and senescence" ], "score": 1, "source_basis": "full_text", "source_audit": { "card": 9, "pmid": "42844664", "doi": "10.1111/acel.70728", "score": 1, "source_basis": "full_text", "source_url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC13646369/", "reason": "A score of 1 was assigned to card No. 9 (R42844664, Aging Cell), where the reference presents the sequence “acetate — GPR43 — HDAC3 inhibition — H4K8 acetylation — suppression of NLRP3-dependent pyroptosis” as an established mechanism. For GPR43 and HDAC3, the study reports expression levels only (Figs. 6O and S14), whereas the authors performed no loss-of-function experiments, such as knockout, a receptor antagonist or an enzyme inhibitor, and the direction of the acetate-associated change in HDAC3 in HUVEC experiments is opposite in two places in the article (Fig. S11). The link between H4K8 acetylation and NLRP3 remains correlational because chromatin immunoprecipitation at the NLRP3 promoter was not performed; the authors acknowledge the need for this experiment in the discussion.\n\nThe authors support the description “necessary and sufficient” for the microbiota as a whole: antibiotic treatment abolishes protection, and faecal microbiota transfer reproduces it. For acetate, only sufficiency is demonstrated (sodium acetate gavage, Figs. 6A–P), since neither acetate blockade nor an acetate-deficient donor was used. Butyric, valeric and isobutyric acids also increased significantly alongside acetate, so the data do not uniquely determine the choice of acetate. The between-group difference in Limosilactobacillus is significant only in metagenomics and not in 16S data (Fig. S13), and it was not administered to animals as a probiotic; therefore, “acetate-producing Limosilactobacillus” should be treated as the authors’ interpretation.\n\nThus, key point d and half of key point e lack causal confirmation, which determined the score.", "evidence": [ { "claim": "Microbiota-dependent protection", "observation": "Antibiotic treatment removes protection and faecal microbiota transfer reproduces it; these interventions concern the microbiota as a whole." }, { "claim": "Acetate sufficiency", "observation": "Sodium acetate gavage improves cardiovascular phenotypes and restores protection after microbiota depletion.", "figure": "6A-P" }, { "claim": "Acetate necessity", "observation": "The author distinguishes the acetate supplementation result from a selective loss-of-function test of acetate; necessity is overstated in the reference." }, { "claim": "GPR43 activation and HDAC3 inhibition", "observation": "The readouts are expression levels; these establish expression changes rather than receptor activation or enzyme activity.", "figures": [ "6O", "S14" ] }, { "claim": "HDAC3 direction in endothelial cells", "observation": "The HUVEC narrative gives opposite directions for the acetate-associated change in HDAC3 expression.", "section": "3.10", "figure": "S11" }, { "claim": "H4K8ac to NLRP3", "observation": "The evidence is associative; the discussion describes the precise epigenetic link as requiring clarification.", "section": "4" }, { "claim": "Specificity for acetate", "observation": "Butyric, valeric and isobutyric acid also increased among the eight measured short-chain fatty acids.", "figure": "5" }, { "claim": "Limosilactobacillus as the acetate-producing mediator", "observation": "The between-group association is significant in metagenomics; in 16S data it is not significant. The attribution to acetate production is an inference from abundance and metabolite associations.", "section": "3.9", "figure": "S13" } ], "rubric_basis": "Thus, key point d and half of key point e lack causal confirmation, which determined the score." } }, { "item": "e7998c70c1", "order": 10, "task": "R42669067", "pmid": "42669067", "doi": "10.1111/acel.70689", "title": "SIRT1 Silences L1 Retrotransposons by Stabilizing Heterochromatin-Modifying Complexes.", "finding": "SIRT1 suppresses L1 transcription and retrotransposition by promoting the association and recruitment of Lamin B1 and KAP1 at the L1 5′-UTR, increasing repressive H3K9me3 chromatin. SIRT1 deficiency derepresses L1, activates cGAS–STING signaling, and induces cellular senescence; reverse-transcriptase inhibition with 3TC rescues this phenotype.", "key_points": [ "SIRT1 represses L1 transcription and retrotransposition", "SIRT1 stabilizes Lamin B1–KAP1 interactions at the L1 5′-UTR", "The mechanism increases repressive H3K9me3 chromatin", "SIRT1 loss activates L1-dependent cGAS–STING signaling and senescence", "3TC rescues senescence caused by SIRT1 deficiency" ], "score": 2, "source_basis": "full_text", "source_audit": null }, { "item": "4983d500d5", "order": 11, "task": "R42759510", "pmid": "42759510", "doi": "10.1016/j.neuron.2026.08.022", "title": "A miR-10a-5p-γCaMKII axis links periphery-to-brain signaling to cognitive vulnerability during female midlife.", "finding": "Epigenetic upregulation of splenic RBMX in middle-aged female mice increases peripheral miR-10a-5p, which contributes to cerebral miR-10a-5p abundance and represses γCaMKII. Manipulating this RBMX–miR-10a-5p–γCaMKII axis alters mitochondrial function, cellular senescence, and memory, while miR-10a-5p inhibition alleviates Alzheimer’s-associated phenotypes in patient-derived neurons and model mice.", "key_points": [ "Female midlife induces epigenetic RBMX upregulation in the spleen", "RBMX promotes increased splenic miR-10a-5p", "Peripheral signaling contributes to brain miR-10a-5p abundance", "miR-10a-5p represses γCaMKII and drives mitochondrial, senescence, and memory phenotypes", "miR-10a-5p inhibition attenuates Alzheimer’s-associated phenotypes" ], "score": 3, "source_basis": "abstract", "source_audit": null }, { "item": "c5375a691e", "order": 12, "task": "R42749700", "pmid": "42749700", "doi": "10.1038/s41467-026-76789-6", "title": "HMGA1-HP1β axis regulates premature aging in Hutchinson-Gilford progeria syndrome through chromatin remodeling.", "finding": "HMGA1 recruits the deubiquitinase USP7 to stabilize HP1β, which reduces chromatin accessibility at ANGPTL2 and suppresses senescence-associated secretory factors, thereby alleviating HGPS cellular senescence. An HMGA1-derived peptide, UHP, prevents HP1β degradation, reduces senescence, and significantly extends the lifespan of LmnaG609G/G609G mice.", "key_points": [ "HMGA1 stabilizes HP1β through USP7 recruitment", "HP1β closes chromatin at ANGPTL2", "ANGPTL2 and SASP expression are suppressed", "The effect on senescence depends on HP1β", "UHP reduces senescence and extends progeria-mouse lifespan" ], "score": 3, "source_basis": "full_text", "source_audit": null }, { "item": "c430779ae8", "order": 13, "task": "R42581103", "pmid": "42581103", "doi": "10.1038/s43587-026-01170-7", "title": "TNFR1 signaling connects inflammation to impaired fatty acid oxidation to drive intestinal stem cell aging.", "finding": "Age-associated TNF acts as a systemic pro-ageing factor that signals through epithelial TNFR1 to suppress mitochondrial fatty acid oxidation, proliferation and regenerative capacity in intestinal stem cells. Blocking inflammation or TNF–TNFR1 signaling protects or restores ISC function, while enhancing mitochondrial fusion improves the function of aged ISCs.", "key_points": [ "The old systemic environment transfers an ISC ageing phenotype to young mice.", "TNF is a causal pro-ageing inflammatory factor.", "Epithelial TNFR1 is required for the detrimental systemic effect.", "TNF suppresses mitochondrial pathways and fatty acid oxidation.", "Countering inflammation or improving mitochondrial function restores ISC activity." ], "score": 2, "source_basis": "full_text", "source_audit": null }, { "item": "31067e3bd5", "order": 14, "task": "R42808804", "pmid": "42808804", "doi": "10.1111/acel.70712", "title": "IGF-1/SLC25A33 Maintains Blood-Labyrinth Barrier Integrity by Suppressing TGF-β/Smad2-Mediated Pericyte Activation in Age-Related Hearing Loss.", "finding": "Age-dependent loss of IGF-1 lowers SLC25A33 expression in strial pericytes, causing mitochondrial reactive oxygen species accumulation and activation of TGF-β/Smad2 signaling. This drives pericyte phenotypic switching, disrupts blood-labyrinth barrier integrity, and worsens hearing loss, whereas IGF-1 supplementation or SLC25A33 overexpression suppresses the pathway and partially restores auditory function.", "key_points": [ "IGF-1 and SLC25A33 decline in aged strial pericytes", "SLC25A33 loss causes mitochondrial ROS accumulation", "Mitochondrial ROS activates TGF-β/Smad2 signaling and pericyte switching", "The pathway disrupts the blood-labyrinth barrier and aggravates hearing loss", "IGF-1 or SLC25A33 restoration partially rescues barrier and auditory function" ], "score": 2, "source_basis": "full_text", "source_audit": null }, { "item": "b971f421de", "order": 15, "task": "R42806003", "pmid": "42806003", "doi": "10.1038/s41467-026-77217-5", "title": "CD38-activated macrophages drive age-related placental senescence by depleting NAD+ in decidual stromal cells.", "finding": "Early inflammation and senescence-associated secretory phenotype activity induce IRF5-dependent CD38 expression in macrophages, which depletes NAD+ in decidual stromal cells and thereby promotes age-related placental senescence. Genetic or pharmacological disruption of this axis, including CD38 inhibition or NAD+ precursor treatment, reduces placental senescence, rescues intrauterine growth restriction, and improves offspring metabolic outcomes.", "key_points": [ "Early inflammation and SASP activate macrophage IRF5", "IRF5 increases macrophage CD38 expression", "Macrophage CD38 depletes stromal-cell NAD+", "NAD+ loss drives placental senescence", "CD38 inhibition or NAD+ replenishment rescues age-related outcomes" ], "score": 2, "source_basis": "full_text", "source_audit": null }, { "item": "d85d128a16", "order": 16, "task": "R42841610", "pmid": "42841610", "doi": "10.1111/acel.70703", "title": "Inhibiting Glutaminase Reverses Senescence-Associated Mitochondrial Dysfunction and Skeletal Muscle Decline.", "finding": "Senescence-associated p38 MAPK signaling increases GLS1 expression and activity in skeletal muscle myoblasts, causing intracellular urea accumulation that impairs mitochondrial function. Inhibiting GLS1 with CB-839 lowers urea, restores electron transport chain complexes and mitochondrial respiration, and improves skeletal muscle integrity and strength in progeroid mice.", "key_points": [ "Senescence activates a p38 MAPK–GLS1 axis", "Elevated GLS1 causes intracellular urea accumulation", "Urea accumulation impairs mitochondrial function", "GLS1 inhibition restores respiratory-chain function", "CB-839 improves muscle structure and strength in progeroid mice" ], "score": 2, "source_basis": "full_text", "source_audit": null }, { "item": "43e52406a0", "order": 17, "task": "R42664348", "pmid": "42664348", "doi": "10.1126/sciadv.aee6780", "title": "Adipose-cartilage communication via EV-Mito-mtDNA signaling promotes osteoarthritis progression.", "finding": "Adipocyte-derived extracellular vesicles enriched in mitochondrial components transfer mitochondrial DNA to chondrocytes, where it activates cGAS-STING signaling and causes inflammation, metabolic dysfunction, senescence, and cartilage degeneration. Genetic or pharmacological inhibition of this pathway attenuates cartilage damage, pain behaviors, and gait abnormalities.", "key_points": [ "Adipocyte-derived EV-Mito carry mitochondrial DNA", "Mitochondrial DNA is transferred to chondrocytes", "Transferred DNA activates cGAS-STING signaling", "The pathway drives senescence and cartilage degeneration", "cGAS-STING inhibition reduces osteoarthritis pathology" ], "score": 3, "source_basis": "full_text", "source_audit": null }, { "item": "0b623181ed", "order": 18, "task": "R42805954", "pmid": "42805954", "doi": "10.1038/s41467-026-77050-w", "title": "ALKBH5-mediated microglia-neuron crosstalk inhibits sympathetic innervation and adipocyte browning in male mice.", "finding": "Microglial ALKBH5 suppresses Ntf5 expression by demethylating Ntf5 mRNA, thereby limiting activation of PVH TrkB-positive neurons, sympathetic innervation of subcutaneous white adipose tissue, and adipocyte browning. Microglia-specific ALKBH5 knockout preserved brown adipocytes and improved metabolic activity during ageing in male mice.", "key_points": [ "Microglial ALKBH5 restrains adipocyte browning", "ALKBH5 knockout increases Ntf5 mRNA m6A methylation and Ntf5 expression", "Ntf5 activates PVH TrkB-positive neurons and downstream sympathetic innervation", "Microglia-specific ALKBH5 loss prevents age-related brown adipocyte decline", "The causal findings were demonstrated in male mice" ], "score": 2, "source_basis": "full_text", "source_audit": null }, { "item": "ae03836e3f", "order": 19, "task": "R42806572", "pmid": "42806572", "doi": "10.1111/acel.70742", "title": "uPAR-Targeting T Cell Engager Exerts Senolytic Effects in Mice and Non-Human Primates With Serum Aminotransferase Activity as a Safety Monitor.", "finding": "A GFD-CD3 bispecific T-cell engager targeting uPAR-positive senescent cells caused dose-dependent senolysis and alleviated age-related pathologies in aged mice and non-human primates at low doses. High doses caused hepatotoxicity through T-cell attack on hepatic endothelial cells, while serum aminotransferase monitoring enabled dosing that retained senolytic efficacy without observed adverse effects.", "key_points": [ "GFD-CD3 targets uPAR-positive senescent cells", "Low-dose treatment produces senolysis in mice and non-human primates", "Senolysis alleviates age-related pathologies", "High-dose toxicity results from T-cell attack on hepatic endothelial cells", "Serum aminotransferase activity provides a safety monitor for dose titration" ], "score": 2, "source_basis": "full_text", "source_audit": null }, { "item": "3d815da8bc", "order": 20, "task": "R42822442", "pmid": "42822442", "doi": "10.1016/j.immuni.2026.09.004", "title": "Glucose-deprived tumor microenvironment activates AMP-activated protein kinase to drive adoptively transferred T helper 9 cell senescence.", "finding": "Glucose deprivation activates AMPK in transferred Th9 cells, initiating a ZAK–NIK cascade that suppresses noncanonical NF-κB signaling and IL-9 production, thereby driving cellular senescence. Restoring glucose or targeting ZAK reduces senescence, improves Th9-cell persistence, and enhances CAR-Th9 efficacy against solid tumors.", "key_points": [ "Glucose deprivation causes Th9-cell senescence", "AMPK is activated by glucose scarcity", "The ZAK–NIK cascade suppresses noncanonical NF-κB signaling and IL-9", "ZAK targeting rejuvenates Th9 cells and improves antitumor efficacy" ], "score": 3, "source_basis": "abstract", "source_audit": null } ] }