Copying genetic material outside chromosomes may sustain skin's inflammatory memory
In skin models, copying deoxyribonucleic acid (DNA) outside chromosomes may preserve inflammatory memory after barrier recovery and prolong deeper skin growth. The hypothesis is rejected if the molecules only dilute during cell division, their removal leaves the repeat response unchanged, or only debris clearance ends it.
Stage of verification
- Hypothesis published2026-09-25
- Indirect evidenceAssessed at 4 of 10
- Direct testAwaited
Map of the hypothesis
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Where in the body
Ageing mechanism
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Target map
Every target of every published hypothesis, each with the actions a hypothesis can propose on it. The targets and the actions of this hypothesis are drawn solid.
Mobile element or insert
Extrachromosomal DNA
DNA molecules located outside chromosomes
Where this hypothesis actsBasal keratinocytes after inflammation and normalization of the epidermal barrier
Hypotheses on this target 1
Gene editing
Silencing
Excision
Repair
What is proposed
Selectively eliminate the extrachromosomal DNA molecules that sustain inflammatory memory
With whatNot stated in the record
HowDevelop selective removal after identifying reproducible sequence junctions absent from chromosomal DNA; preserve chromosomes and the ordinary inflammatory response
Possible result
Possible stabilization of SPV_6 while preserving the response to new injury and clearance of altered cells
From the recordИзбирательное удаление соответствующих молекул должно стабилизировать SPV_6, сохранив обычный ответ на новое повреждение и уничтожение изменённых клеток.
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Every target read from the published hypotheses, each kind around its pictogram. A larger mark means more hypotheses act on that target. Point at a mark and the actions proposed on it branch out of it.
Solid and named: the targets of this hypothesis
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The logic
The train of thought that ends in this hypothesis. Each stage is the reason the next exists. The master question narrows to a goal, the goal to an unknown nobody has closed, the unknown to the hypothesis proposed here. Every step below says what it rests on and what carries it.
Skin may recover its protective surface while retaining changes that shape its response to the next injury. The unexpected move is to propose that skin cells preserve that history by copying genetic material outside their chromosomes. This is a hypothesis generated by the pipeline, not a measured result: the supplied material does not establish that such a copying system exists in recovered skin.
- Initial injury is proposed to leave some basal keratinocytes with DNA molecules outside their chromosomes.
- These molecules would copy themselves and pass into daughter cells, rather than simply becoming diluted with each division.
- The inherited material would keep cells primed for inflammation after the skin’s protective barrier has recovered.
- A later irritation would make the retained material supply DNA that triggers inflammatory signalling inside cells.
- Those signals would prolong the release of inflammatory mediators, substances that carry or regulate inflammatory signals.
- The prolonged signals would extend the multiplication of fibroblasts, cells that produce the dermis’s supporting material, delaying the end of dermal growth.
- Selective removal of the copying material would allow the prolonged response to end while leaving ordinary responses to new damage intact.
A workshop keeps an old emergency work order and copies it for every new shift, even after the original repair is finished. A later alarm brings the copied order back into use and keeps work going longer than needed.
Where the picture breaks: DNA is not a written command that cells simply obey. The proposal still has to establish that the extra material copies itself, survives recovery, and causes the particular signals that prolong growth.
- Master questionstep 01 of 04
The goal is a treatment that brings the functioning of middle-aged human skin closer to that of young people.
Rests on: The stated goal is functional improvement toward a younger reference state; the input does not specify which functions would define success.
Stated in the chain - Goal pillarstep 02 of 04
Repair must limit itself across repeated cycles of damage and recovery.
Rests on: The chain selects the ability to stop repair as a route toward younger skin function.
LeapThe goal does not establish that failure to stop repeated repair accounts for the functional difference between middle-aged and young skin. No supplied source establishes that connection.
- Gap questionstep 03 of 04
The epidermis, the skin’s outer cellular layer, might retain inflammatory memory, a lasting change that alters responses to later irritation, after its protective barrier recovers. The question is whether selectively suppressing that memory stops renewed growth of the dermis, the supporting layer beneath it, without increasing wound reopening or weakening the removal of potentially cancerous cells.
Rests on: The preceding stage requires repair to stop; this stage selects persistent inflammatory memory as a possible reason that deeper skin growth continues.
LeapThe preceding stage does not explain why inflammatory memory would prolong dermal growth. Supplied sources address persistent memory and inflammation, but do not establish this connection or show that memory can be suppressed while preserving wound strength and cancer control.
- Hypothesisstep 04 of 04
Some basal keratinocytes, cells in the bottom layer of the epidermis, are proposed to retain and copy DNA outside their chromosomes after inflammation. Passing these molecules to daughter cells would preserve readiness for another inflammatory response. Later irritation would make this material trigger released signals that prolong growth beneath the surface. Selective removal is predicted to stop that persistence while preserving ordinary injury responses and removal of altered cells.
Rests on: The preceding question supplies the proposed relationship between persistent epidermal memory and renewed dermal growth. The endpoint supplies a candidate carrier and a distinguishing requirement: the material must keep copying itself, and its removal must change the response. Restoring chromatin accessibility, the ease with which cell machinery can reach DNA in its protein packaging, is predicted to be insufficient.
Stated in the chain
What is carried, and what is not. Supplied sources speak to two broad components: persistent inflammatory memory and inflammation associated with DNA outside the nucleus, the compartment containing chromosomes. Cell Stem Cell (2021, S2) reports persistent accessibility of particular DNA regions in mouse epidermal stem cells, cells capable of renewing the outer skin, but not an independently copying DNA carrier; The Journal of Investigative Dermatology (2022, S9), available here only as an abstract, links damaged DNA leaving the nucleus in keratinocytes to inflammatory signalling, but not to inherited memory or dermal growth; Science (2026, S4) reports memory persisting through time and cell division through changes in DNA packaging and chemical marking in mouse epidermal stem cells, providing a competing account without testing whether the proposed extra DNA is necessary—none establishes the proposed sequence end to end.S2S9S4
Where the reasoning is carried by something unstated · 2
- Goal pillar. The goal does not establish that failure to stop repeated repair accounts for the functional difference between middle-aged and young skin. No supplied source establishes that connection. Establish the missing link before relying on this step.
- Gap question. The preceding stage does not explain why inflammatory memory would prolong dermal growth. Supplied sources address persistent memory and inflammation, but do not establish this connection or show that memory can be suppressed while preserving wound strength and cancer control. Establish the missing link before relying on this step.
How a result here could mislead · 3
- A shorter inflammatory response after attempted DNA removal could reflect chromosome damage or loss of normal cell responsiveness. Conversely, an unchanged response could reflect failure to remove the proposed carrier. What closes it: The design explicitly requires checks for chromosome damage and preservation of the ordinary inflammatory response. Interpretation also requires direct confirmation that the targeted molecules were depleted and remained depleted through the repeat irritation; the input provides no quantitative criterion for successful removal.
- Persistence after replacing macrophages, cells that engulf and process dead-cell material, could be credited to inherited DNA even if the unusually slow-to-clear remains proposed by the rival were still present. What closes it: Verify removal of the residual dead-cell material itself, rather than treating macrophage replacement or normal average clearance activity as proof. Compare the repeat response after verified clearance with the response after verified removal of the candidate DNA, while maintaining the specified matching of barrier function.
- Reintroducing purified DNA could provoke a fresh inflammatory response and appear to restore memory, even if the material does not recreate a persistent, copying carrier. What closes it: The proposed rest period must be accompanied by evidence that the introduced molecules persist and copy before repeat irritation. A comparison with DNA that does not recreate the proposed carrier is needed to distinguish restoration of memory from inflammation caused by introducing DNA; that comparison is not specified in the input, nor is the amount described as physiological.
What would make this wrong. The proposed mechanism would fail if the candidate molecules only became diluted during cell division rather than copying themselves, if verified selective removal left the prolonged repeat response unchanged while preserving normal cell function, or if verified clearance of dead-cell remains alone eliminated the response and candidate-DNA removal did not. Failure to preserve wound strength or removal of altered cells would separately defeat the claimed therapeutic selectivity, even if the memory mechanism were supported.
What it would change. If the hypothesis held, work toward younger skin function would have a specific proposed target: an inherited DNA carrier that keeps repair-associated inflammation going after surface recovery. Suppressing inflammation alone or restoring DNA accessibility would then be insufficient to remove that carrier. Even a successful model test would not establish improved function in middle-aged human skin, durable benefit over repeated injuries, or preserved wound strength and cancer control; the model species, acceptable safety losses, and the meaning of the proposed outcome label SPV_6 are not supplied.
Sources read · 8
Inflammatory memory in psoriasis: From remission to recurrence. · The Journal of allergy and clinical immunology · 2024
“Here, we review research into the "inflammatory memory" in resolved psoriasis skin and the potential mechanisms leading to psoriasis recurrence following drug withdrawal.”
Does not settle: Источник не описывает внехромосомные молекулы ДНК, их воспроизведение или наследование в базальных кератиноцитах, внутриклеточную ДНК при повторном раздражении, рост дермы, доступность хроматина, SPV_6 либо избирательное удаление таких молекул.
Establishment, maintenance, and recall of inflammatory memory. · Cell stem cell · 2021
“At D180 post-inflammation, only memory domains remained differentially accessible, while the suppressed domains that had shown reduced accessibility at D30 returned to baseline by this time.”
Does not settle: Источник описывает сохраняющуюся доступность участков хроматина в эпидермальных стволовых клетках мышей после воспаления. Он не устанавливает наличие, воспроизведение, наследование или избирательное удаление внехромосомных молекул ДНК, их роль во внутриклеточной ДНК, секреции медиаторов, росте дермы или SPV_6.
Keratinocytes: new perspectives in inflammatory skin diseases. · Trends in molecular medicine · 2025
“Beyond these well-established functions, emerging evidence reveals their dynamic interactions with the nervous system and their capacity to retain inflammatory memory.”
Does not settle: Источник не устанавливает роль внехромосомных молекул ДНК, их воспроизведение или наследование, внутриклеточную ДНК при повторном раздражении, влияние на рост дермы либо эффект их избирательного удаления.
Distinctive DNA sequence features define epigenetic longevity of inflammatory memory. · Science (New York, N.Y.) · 2026
“This collective epigenetic signature enabled stable propagation of inflammatory memory through time and cell division.”
Does not settle: Источник не исследует внехромосомные молекулы ДНК, их воспроизведение или избирательное удаление. Он описывает память в эпидермальных стволовых клетках мыши через устойчивую доступность хроматина, деметилирование ДНК и H2A.Z; влияние на SPV_6, рост дермы, обычный ответ на новое повреждение и уничтожение изменённых клеток не установлено.
STING induces ZBP1-mediated necroptosis independently of TNFR1 and FADD. · Nature · 2025
“Here we find that the loss of Casp8 leads to an accumulation of cytosolic DNA that is responsible for the activation of a cyclic GMP-AMP synthase (cGAS)–stimulator of interferon genes (STING)-mediated transcriptional program.”
Does not settle: Источник описывает модель с удалением Casp8 в эпидермальных кератиноцитах мыши. Он не устанавливает происхождение цитозольной ДНК как воспроизводимого внехромосомного материала, её наследование после восстановления барьера, воспалительную память, влияние на рост дермы, SPV_6 или эффект избирательного удаления таких молекул.
The STING antagonist H-151 ameliorates psoriasis via suppression of STING/NF-κB-mediated inflammation. · British journal of pharmacology · 2021
“The stimulator of interferon genes (STING) protein engages in sensing of cytosolic DNA to initiate dsDNA-driven immune responses.”
Does not settle: Источник не устанавливает наличие, внехромосомное происхождение, воспроизведение или наследование молекул ДНК в базальных кератиноцитах после воспаления. Он также не проверяет воспалительную память, состояние SPV_6, рост дермы, восстановление доступности хроматина или избирательное удаление таких молекул.
STING inhibition alleviates experimental peritoneal damage: potential therapeutic relevance for peritoneal dialysis. · The Journal of pathology · 2025
“Exogenous DNA from viruses or bacteria, as well as host DNA from stressed mitochondria and damaged genomic DNA released into the cytoplasm, can act as DAMPs.”
Does not settle: Источник оставляет открытыми наличие, воспроизведение и наследование внехромосомной ДНК в базальных кератиноцитах кожи после воспаления, её роль в воспалительной памяти, влиянии на дерму и SPV_6, а также последствия её избирательного удаления.
Cytosolic DNA‒Mediated STING-Dependent Inflammation Contributes to the Progression of Psoriasis. · The Journal of investigative dermatology · 2022
“Furthermore, incubation of KCs with TNF-α or hydrogen peroxide increased oxidative DNA damage, induced nuclear DNA release into the cytosol, and inhibited double-stranded DNA‒induced degradation of STING protein.”
Does not settle: Абстракт связывает повреждение ДНК в кератиноцитах с выходом ядерной ДНК в цитозоль и STING-зависимым воспалением. Он не устанавливает существование, воспроизведение или наследование внехромосомных молекул ДНК, их роль в воспалительной памяти после восстановления барьера, влияние на рост дермы, избирательное удаление таких молекул или SPV_6.
The gap this hypothesis explains
Does skin’s inflammatory memory survive barrier recovery, and can suppressing it safely stop repeated deeper-skin growth?
Original wording · exactly as the pipeline generated it
Сохраняется ли воспалительная память эпидермиса после нормализации барьера, и устраняет ли её избирательное подавление повторный дермальный рост без увеличения раскрытия ран и ослабления противоопухолевого контроля?
What this question is asking
The question concerns whether the skin’s outer layer retains a lasting change caused by inflammation after its protective barrier has recovered. It asks whether selectively suppressing that inflammatory memory stops repeated growth in the dermis, the deeper skin layer, without increasing wound reopening or weakening the body’s control of tumors. The relevant comparison is between skin with recovered barrier function whose inflammatory memory is suppressed and otherwise comparable skin without that suppression. The question treats a connection between lasting memory and repeated growth as a possibility to examine; the supplied sources do not establish that connection. The intended setting is middle-aged human skin, but the input does not define what counts as repeated dermal growth or full barrier recovery.
- Epidermis
- The outer layer of skin. The question locates the proposed inflammatory memory in this layer.
- Skin barrier and barrier normalization
- The skin’s protective function at its surface. Normalization means recovery to a defined reference level, but the input supplies no measurement or threshold for deciding when that has occurred.
- Inflammation
- A tissue response involving immune activity after injury or disturbance. The question distinguishes the earlier response from a lasting change that might remain after visible or functional recovery.
- Inflammatory memory
- A lasting change following earlier inflammation that can affect a later tissue response. Here it is a proposed property of the epidermis, not a demonstrated finding or a single defined substance in the supplied evidence.
- Selective suppression
- An intervention directed specifically at the proposed memory. A treatment that broadly changes inflammation or gene activity does not, by that description alone, establish such selectivity.
- Dermis and repeated dermal growth
- The dermis is the skin layer beneath the epidermis. Repeated dermal growth means recurring growth in that layer, but the input does not identify which cells or structures grow or whether the phrase refers to scarring or another process.
- Wound closure, wound reopening, and wound integrity
- Closure describes a wound becoming covered or closed; reopening describes a previously closed wound opening again. Wound integrity concerns whether the repaired tissue remains intact, so initial closure alone does not answer the reopening question.
- Antitumor control
- The body’s ability to restrain tumor development or growth. The question requires that this protection not weaken, but the input specifies no measurement of it.
- Gene activity and its regulation
- Gene activity concerns how cells use information in their genetic material. Regulation changes how that information is used; several supplied sources address this broad category without establishing that they selectively alter inflammatory memory.
- Histones and histone demethylases
- Histones are proteins around which genetic material is packaged. Histone demethylases are a class of enzymes that remove particular chemical marks from these proteins; S7 reports impaired healing after inhibiting relevant enzymes.
- Butyrate
- The compound used in S1 to alter macrophage function through effects involving histones. The supplied finding concerns wound healing in diabetic mice.
- Macrophages
- Immune cells involved in inflammation and tissue repair. S1 and S2 concern interventions affecting these cells, which does not itself establish memory in the epidermis.
- Inflammation-responsive hydrogel
- A water-containing gel designed to respond to inflammatory conditions. S2 uses it for local delivery of an intervention affecting immune activity.
- Keratinocytes
- Cells forming the main cellular covering of the epidermis. Their activation is mentioned in S2, and restoration of the surface covering is the wound outcome described in S5.
- Atopic dermatitis
- An inflammatory skin disease. S3 reports improved barrier function in models of this disease, which are not identified as models of recovered middle-aged human skin.
- Corin
- The synthetic compound studied in S5, where it inhibits machinery regulating gene activity. The supplied result concerns faster restoration of the surface covering of mouse tail wounds.
- Hair follicle
- The skin structure from which a hair grows. S7 reports effects on its development and growth alongside delayed wound healing.
- Experimental model
- A biological setting used to study a condition or process, such as a mouse wound or a model of skin disease. Its findings establish results in that setting, with applicability to middle-aged human skin remaining a separate question.
- Memory does not persist after recovery Under this outcome, recovered skin would no longer contain the lasting inflammatory change targeted by the question. Suppression of persistent memory would therefore not explain prevention of subsequent deeper-skin growth.
- Memory persists, and suppression safely stops growth Under the proposed mechanism, a lasting change in the outer skin layer would continue to influence growth in the deeper layer after barrier recovery. Stopping that influence would prevent repeated growth while preserving wound integrity and tumor control within the conditions actually assessed.
- Memory persists, but suppression does not stop growth Persistence would establish that barrier recovery and loss of inflammatory memory occur separately. Failure of selective suppression to stop growth would mean that removing this memory is insufficient to produce the proposed benefit.
- Suppression stops growth but compromises safety Repeated deeper-skin growth would stop, but wounds would reopen more often or tumor control would weaken. That outcome would fail the question’s combined requirement of preventing growth while preserving both protective functions.
Barrier recovery, lasting changes after inflammation, and growth in deeper skin are different outcomes; evidence about one does not automatically establish the others. If inflammatory memory remains and drives repeated growth, suppressing it could interrupt the proposed sequence from earlier inflammation to later tissue growth. Whether that also preserves wound integrity and tumor control is a separate part of the question. Mistaking faster wound closure for evidence on all these outcomes would leave the proposed benefit and its safety unestablished.
The mechanism it proposes
The engine's own statement of the hypothesis, in full.
Проверяемая гипотеза: после воспаления часть базальных кератиноцитов сохраняет способные к воспроизведению внехромосомные молекулы ДНК, возникшие при первичном повреждении. Их наследование поддерживает готовность эпидермиса к повторному воспалительному ответу после нормализации барьера. При следующем раздражении эти молекулы становятся источником внутриклеточной ДНК, вызывающей секрецию медиаторов, которые продлевают рост дермы. Для сохранения патологического ответа необходимо воспроизведение этого внехромосомного материала; восстановления доступности хроматина до исходного уровня недостаточно. Избирательное удаление соответствующих молекул должно стабилизировать SPV_6, сохранив обычный ответ на новое повреждение и уничтожение изменённых клеток.
Testing and possible results
The prediction that would tell it apart
A hypothesis that predicts what its rivals predict is not worth running an experiment over. This is the observation on which this one differs.
В моделях кожи с одинаковыми исходными водными потерями и проницаемостью для контрольного вещества ответ на повторное раздражение сохраняется после замены макрофагов и удаления остатков погибших клеток. В кератиноцитах при этом обнаруживаются одни и те же внехромосомные соединения последовательностей после нескольких делений, а включение метки в новые копии подтверждает их воспроизведение. После избирательного удаления этих молекул сокращаются продолжительность секреции воспалительных медиаторов и период пролиферации фибробластов. Повторное введение очищенного материала в физиологическом количестве восстанавливает эффект после периода покоя. Если молекулы только разбавляются при делении, их удаление не меняет повторный ответ либо эффект исчезает исключительно после устранения клеточных остатков, гипотеза отвергается. Сохранение прочности и противоопухолевого контроля проверяется отдельно по заранее заданным границам допустимого ухудшения.
Would tell it apart from at least one rival. The prediction specifies observable reductions following selective removal, restoration following reintroduction, and explicit rejection conditions. No rival prediction is supplied. Only a bench experiment would settle it.
What testing it would take
The engine's own read on whether this is testable with methods that already exist.
Обогащение внехромосомной ДНК, секвенирование её соединений, отслеживание клеточных линий и органотипические модели позволяют проверить наличие и наследование предполагаемого носителя. Избирательное удаление возможно разрабатывать только после обнаружения воспроизводимых соединений последовательностей, отсутствующих в хромосомной ДНК. Обязательны контроль повреждения хромосом и проверка сохранности обычного воспалительного ответа. Само существование воспроизводимого носителя в восстановленном эпидермисе пока не установлено.
Other explanations
Every other hypothesis the engine wrote for the same gap, and the observation that would separate the two.
В моделях кожи с одинаковыми исходными водными потерями и проницаемостью для контрольного вещества ответ на повторное раздражение сохраняется после замены макрофагов и удаления остатков погибших клеток. В кератиноцитах при этом обнаруживаются одни и те же внехромосомные соединения последовательностей после нескольких делений, а включение метки в новые копии подтверждает их воспроизведение. После избирательного удаления этих молекул сокращаются продолжительность секреции воспалительных медиаторов и период пролиферации фибробластов. Повторное введение очищенного материала в физиологическом количестве восстанавливает эффект после периода покоя. Если молекулы только разбавляются при делении, их удаление не меняет повторный ответ либо эффект исчезает исключительно после устранения клеточных остатков, гипотеза отвергается. Сохранение прочности и противоопухолевого контроля проверяется отдельно по заранее заданным границам допустимого ухудшения.
- What would separate them
Slow processing of dead-cell remains may sustain skin inflammation and dermal growth predicts: При одинаковых количестве погибших клеток, средней скорости их поступления и среднем времени переработки более широкий разброс времени переработки увеличивает задержку удаления остатков и продлевает дермальный рост. Удаление оставшегося груза после восстановления барьера сокращает повторный ответ без изменения эпидермальной ДНК или доступности хроматина. Перенос сопоставимого остаточного груза в модель без предшествующего раздражения воспроизводит затяжной ответ, который прекращается после его переработки. Если повторный ответ сохраняется после подтверждённого полного удаления груза, а избирательное удаление внехромосомного материала кератиноцитов устраняет его, эта гипотеза проигрывает this hypothesis.
Why this is not the mainstream account
The engine is asked to say what its hypothesis would overturn and what would surprise a specialist. This is its answer.
В первичном исследовании показано образование внехромосомной кольцевой ДНК при апоптозе и её выраженное иммуностимулирующее действие. Это поддерживает возможность такого носителя, но не доказывает его воспроизведение или участие в памяти кожи. [Исследование eccDNA, 2021](https://pubmed.ncbi.nlm.nih.gov/34671165/). Экспериментально установленная долговременная доступность участков хроматина после воспаления задаёт сильную альтернативную модель. [Larsen и соавт., 2021](https://pubmed.ncbi.nlm.nih.gov/34320411/).
Эпигенетика эпителиальных стволовых клеток. Пересмотра потребует учебная глава «Клеточная память воспаления и наследование состояния хроматина»: для данного повторного ответа придётся признать обязательное наследование приобретённого внехромосомного материала.
Очищенная внехромосомная ДНК переносит длительную готовность к повторному воспалению в ранее не раздражённый эпидермис; эффект сохраняется через несколько делений и требует воспроизведения перенесённых молекул. Однократная острая реакция на введение ДНК таким результатом не считается.
В выполненном целевом поиске не найден обзор, утверждающий, что воспроизводимая внехромосомная ДНК необходима для длительной воспалительной памяти восстановленного эпидермиса. Известные работы об иммуногенности такой ДНК этого утверждения не устанавливают. Отсутствие публикаций нельзя доказать ограниченным поиском, поэтому соответствие этому критерию предварительное.
What stands behind it
Which of the figures above have a study behind them, which are the engine's own, and what it would take to refute the hypothesis. This audit never judges the idea.
This hypothesis states no figure and cites no study, so there is nothing here to trace.
What it would take to refute it. Nothing already retrieved carries the prediction’s terms and it names no measurement this layer can route to a public dataset, so the bench is the residual — not a finding against it.
0 citation handles extracted; 1 Europe PMC search run; 0 records examined; 0 sources stored for enrichment, 0 with full text. A citation that did not resolve is a bibliographic failure, not proof that no such paper exists, and no hypothesis is blocked by this audit.