{"paper_id":"c7cedcc4-622c-4cc2-ac8c-6782e4b83596","body_text":"PREPRINT\nAuthor-formatted, not peer-reviewed document posted on 03/02/2026\nDOI: https://doi.org/10.3897/arphapreprints.e187326\nAdaptive Regenerative Error Due to Loss\nof Cellular Reference Pattern: A\nHypothesis of Dominant Substitution in\nChronic Inflammatory Microenvironments\nPriscila Gil\n\nReviewable v 1\nAdaptive Regenerative Error Due to Loss of\nCellular Reference Pattern: A Hypothesis of\nDominant Substitution in Chronic Inflammatory\nMicroenvironments\nPriscila Gil \n‡ Independent Researcher, Leiria, Portugal\nCorresponding author: Priscila Gil (priscila.gil83@gmail.com)\nAbstract\nAberrant  cellular  adaptation  is  a  hallmark  of  various  chronic  diseases,  including\nendometriosis,  metaplasia,  and  fibrotic  conditions.  This  paper  proposes  a  novel\nhypothesis: that such pathological transformations result from a progressive loss of the\noriginal  cellular  reference  pattern  under  sustained  inflammatory  and  dysregulated\nconditions.  Termed  the  Dominant  Substitution  Hypothesis,  this  model  suggests  that\nchronic  microenvironmental  disruption  alters  regenerative  cues,  gradually  replacing\nhealthy cell phenotypes with adaptive, yet functionally impaired, variants. Once a critical\nthreshold  is  reached,  the  adaptive  phenotype  becomes  dominant,  perpetuating\ndysfunction  and  inhibiting  restoration. The  hypothesis integrates evidence  from tissue\nplasticity, extracellular matrix disorganization, epigenetic modulation, microbiota-driven\nsignaling, and immune-hormonal imbalance. Implications for diagnosis, prevention, and\nregenerative therapy are discussed, with a focus on early intervention to preserve cellular\nidentity and interrupt the degenerative cycle.\nKeywords\nRegenerative  Error,  Cellular  Pattern  Loss,  Epigenetic  Drift,  Phenotypic  Substitution,\nChronic  Inflammation,  Tissue  Remodeling,  Microbiota  Signaling,  Cellular  Plasticity,\nEndometriosis, Repair Failure Mechanism\nIntroduction\nChronic  inflammatory  conditions  often  lead  to  progressive  structural  and  functional\nchanges  in  tissues,  frequently  culminating  in  irreversible  degeneration.  Despite\nadvancements in  understanding  cellular plasticity, epigenetics, and  immunometabolic\n‡ \n© Gil P . This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0),\nwhich permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are\ncredited.\nAuthor-formatted, not peer-reviewed document posted on 03/02/2026. DOI:  \nhttps://doi.org/10.3897/arphapreprints.e187326\n\ninteractions, a  unified  explanation  for  the  transition  from  regeneration  to  dysfunction\nremains elusive. Current models treat pathological transformations as either genetically\ndriven or immune-mediated, frequently overlooking the role of long-term environmental\ndisruption on cellular identity. Accordingly, this manuscript is presented as a hypothesis-\ndriven conceptual framework rather than an experimental or data-reporting study.\nThis paper introduces a hypothesis-driven conceptual framework, termed the Dominant\nSubstitution Hypothesis, which proposes that under conditions of persistent tissue stress\nand  unresolved  inflammation,  the  cellular  microenvironment  becomes  progressively\ndysregulated. This  dysregulation  disrupts  the  cues  necessary  for  faithful  cellular\nregeneration, causing new cells to adopt adaptive phenotypes that are not functionally\nequivalent  to  the  originals.  Initially,  these  adaptations  serve  as  compensatory\nmechanisms, but over time, their accumulation surpasses a critical threshold. Once the\nproportion  of  adaptive  cells  exceeds  that  of  original  phenotypes,  the  altered  state\nbecomes self-perpetuating, locking the tissue into a dysfunctional loop.\nThis  hypothesis  builds  upon  established  evidence  from  regenerative  biology, matrix\nremodeling, epigenetic drift, and gut microbiota signaling. By integrating these domains,\nit aims to offer a comprehensive model for early identification of degenerative risk and\nopen  avenues  for  interventions  focused  on  preserving  or  restoring  the  original\nregenerative pattern of cellular identity. The purpose of this hypothesis is to provide a\nunifying  explanatory  model  and  to  stimulate  future  experimental  and  clinical\ninvestigation.\nTheoretical Background\nTo  establish  the  conceptual  foundation  for the  Dominant Substitution  Hypothesis, this\nsection  reviews  the  major  biological  mechanisms  that  support  the  plausibility  of\nprogressive loss of cellular reference in chronic degenerative conditions.\nCellular Plasticity and Phenotypic Drift\nCellular plasticity refers to the ability of cells to modify their phenotype in response to\nenvironmental stimuli. While essential for development and tissue repair, plasticity can\nalso contribute to pathological transformation under chronic stress. Studies in metaplasia\n(Slack 2007 ), epithelial-to-mesenchymal transition (EMT) ( Zeisberg and Neilson 2019 ),\nand adaptive immune responses demonstrate that cells may adopt noncanonical states\nwhen exposed to sustained microenvironmental disruption.\nExtracellular Matrix Disruption and Loss of Structural Cues\nThe  extracellular  matrix  (ECM)  provides  not  only  mechanical  support  but  also\nbiochemical guidance for cell behavior. Chronic inflammation alters ECM composition\nand stiffness ( Wynn and Ramalingam 2012 ), leading to loss of spatial orientation ( Zahir\nand Weaver 2004 ), aberrant integrin signaling, and impaired regeneration. Without an\n2\nAuthor-formatted, not peer-reviewed document posted on 03/02/2026. DOI:  \nhttps://doi.org/10.3897/arphapreprints.e187326\n\nintact  ECM  scaffold,  regenerating  cells  receive  distorted  positional  information,\nincreasing the risk of phenotypic deviation.\nEpigenetic Modulation Under Chronic Inflammation\nEpigenetic  changes, such  as  DNA  methylation, histone  modification, and  chromatin\nremodeling,  are  responsive  to  environmental  cues  and  influence  gene  expression\nwithout altering  DNA sequence. Persistent inflammatory signals—especially cytokines\nand oxidative stress—drive epigenetic drift ( Feil and Fraga 2012 ), which may lock cells\ninto maladaptive phenotypes over time ( Coussens and Werb 2012 ).\nMicrobiota-Driven Systemic Signaling\nThe intestinal microbiota exerts systemic effects on host tissues ( Belkaid and Hand 2014 )\nthrough metabolites, immune modulation, and hormonal cross-talk. Dysbiosis disrupts\nthese signals, contributing to chronic low-grade inflammation and altering the metabolic\nand  immunological  context  in  which  cells  regenerate.  This  adds  another  layer  of\nenvironmental complexity that may influence the fidelity of cellular renewal.\nThreshold Dynamics and Phenotypic Dominance\nCell  populations are  shaped  by feedback loops and  proportional  dynamics. When  a\nsubset of cells acquires a stable but maladaptive phenotype and their proportion exceeds\na critical threshold, they begin to dictate the microenvironmental signals that guide further\ndifferentiation. This self-reinforcing shift results in the replacement of original phenotypes\nby dysfunctional variants, closing the regenerative window.\nHypothesis Formulation\nThe  Dominant Substitution  Hypothesis proposes a  progressive  model  of regenerative\nfailure  in  chronically  inflamed  tissues.  This  model  rests  on  the  principle  that cell\nregeneration is not only genetically programmed, but also context-dependent, requiring\ncoherent  spatial,  biochemical,  and  mechanical  cues  from  the  surrounding\nmicroenvironment.  When  these  cues  become  dysregulated  over  time,  the  resulting\nregenerative process is impaired, and new cells increasingly diverge from the original\nphenotype.\nSequential Phases of Adaptive Regeneration\nThe hypothesis outlines three core phases:\n1. Initial  Dysregulation:  The  tissue  experiences  prolonged  inflammation  or\nbiochemical imbalance, subtly disrupting cellular guidance signals.\n3\nAuthor-formatted, not peer-reviewed document posted on 03/02/2026. DOI:  \nhttps://doi.org/10.3897/arphapreprints.e187326\n\n2. Adaptive Regeneration: Regenerating cells begin to adopt partially functional but\naltered phenotypes, aimed at surviving in a damaged environment.\n3. Threshold Substitution: Once the proportion of adaptive cells surpasses a critical\nthreshold, these variants shape the local microenvironment, influencing new cells\nto conform to the altered state. The original phenotype becomes progressively\ninaccessible.\nSelf-Reinforcing Degeneration\nThis transition results in a self-perpetuating cycle in which dysfunctional cells dominate,\nfurther distorting regenerative signals and stabilizing the maladaptive tissue structure.\nRather than representing a random mutation or external aggression, this degenerative\nprocess is conceptualized as a systemic loss of reference, where the tissue gradually\n'forgets' its original regenerative blueprint.\nGraphical Representation\nThis process can be modeled as a dynamic threshold function, in which the probability of\nphenotypic drift increases as the ratio of adapted-to-original cells rises. A tipping point is\nreached  when  the  majority  of environmental  signals  reflect the  adapted  phenotype,\ntriggering a shift from reversible adaptation to irreversible substitution. This marks the end\nof effective tissue recovery and the establishment of chronic pathology.\nTheoretical Case Studies\nTo  illustrate  the  applicability  of the  Dominant Substitution  Hypothesis  across  diverse\npathological  contexts, this section  examines several  conditions in  which  maladaptive\ncellular transformation is a defining feature. These examples are used to demonstrate\nhow a progressive shift in regenerative guidance can underpin chronic dysfunction.\nEndometriosis\nEndometriosis involves the presence of endometrial-like tissue outside the uterine cavity,\ntypically  within  the  pelvic  peritoneum.  Though  traditionally  explained  by  retrograde\nmenstruation or stem cell misplacement, the persistence and recurrence of endometriotic\nlesions  suggest  a  deeper  regenerative  misdirection.  Chronic  pelvic  inflammation,\nhormonal  dysregulation, and  immune  dysfunction  alter  the  local  tissue  environment,\npromoting the differentiation of ectopic cells with endometrial characteristics. As these\nmaladaptive  phenotypes become  dominant, they reinforce  their own  environment via\nestrogen  production,  angiogenesis,  and  inflammatory  cytokines,  exemplifying  the\nthreshold model of substitution.\n4\nAuthor-formatted, not peer-reviewed document posted on 03/02/2026. DOI:  \nhttps://doi.org/10.3897/arphapreprints.e187326\n\nBarrett’s Esophagus\nIn  Barrett’s esophagus, chronic gastroesophageal  reflux leads to  the  replacement of\nnormal  squamous  epithelium  with  columnar  intestinal-type  cells.  This  metaplastic\ntransformation arises as a protective adaptation to acid exposure, yet results in increased\ncancer  risk.  Over  time,  the  adaptive  phenotype  dominates  the  esophageal  lining,\ndisrupting regenerative fidelity and establishing a new, less functional baseline.\nIntestinal Metaplasia in Chronic Gastritis\nChronic infection with Helicobacter pylori or autoimmune gastritis induces inflammation\nand  epithelial  stress in  the  stomach  lining. The  gastric epithelium begins to  express\nintestinal markers in an apparent attempt to survive persistent damage, illustrating the\nsame pattern of loss of original phenotype and substitution by adaptive, yet inappropriate,\ncellular forms.\nFibrotic Tissue Remodeling\nIn organs such as the liver, lungs, and pelvic peritoneum, chronic inflammation leads to\nexcessive  deposition  of  extracellular  matrix  and  fibroblast  activation.  As  fibrosis\nprogresses, the normal parenchyma is gradually replaced by fibrotic tissue, not due to\ncell  death  alone  but  due  to  impaired  regeneration.  Fibrotic  cells  dominate  the\nmicroenvironment, locking the tissue into a non-functional, maladaptive structure.\nPossible Extension to Early Neoplastic Transformation\nIn some pre-cancerous states, cells lose their differentiated identity and acquire stem-like,\nproliferative traits. This dedifferentiation may represent a final stage in the substitution\nprocess,  where  not  only  regenerative  cues  are  lost,  but  control  over  growth  and\nspecialization is abandoned. Such transformations, particularly when linked to chronic\ninflammation  and  epigenetic  instability,  may  be  viewed  as  extensions  of  the  same\nthreshold model.\nPractical Implications\nThe  Dominant  Substitution  Hypothesis  not  only  offers  a  theoretical  framework  to\nreinterpret chronic degenerative diseases, but also suggests new practical strategies for\nintervention, diagnosis, and prevention. By focusing on the early phases of regenerative\ndisruption, it may be possible to prevent maladaptive phenotypic dominance before the\ntipping point is reached.\n5\nAuthor-formatted, not peer-reviewed document posted on 03/02/2026. DOI:  \nhttps://doi.org/10.3897/arphapreprints.e187326\n\nEarly Identification of Regenerative Drift\nMonitoring subtle shifts in cell phenotype, matrix composition, and inflammatory markers\nmay allow clinicians to detect the onset of maladaptive regeneration. Advanced imaging,\nsingle-cell RNA sequencing, and tissue-specific epigenetic profiling could be leveraged\nto identify pre-substitution states in at-risk patients ( Barker and Clevers 2010 ). \nRestoring the Original Regenerative Environment\nInterventions  aimed  at re-establishing  the  structural  and  biochemical  integrity  of the\nregenerative niche may help maintain or recover original cellular identity. This includes\nmodulation of the extracellular matrix, suppression of chronic inflammatory mediators,\nand hormonal balance restoration.\nMicrobiota Modulation and Systemic Homeostasis\nGiven  the  systemic  influence  of gut microbiota  on  immune  and  metabolic  signaling,\nstrategies to  correct dysbiosis—through  diet, probiotics, prebiotics, or fecal  microbiota\ntransplant—may improve the cellular regenerative environment in distant tissues.\nEpigenetic Therapies and Differentiation Reprogramming\nPharmacological  or  nutrigenomic  modulation  of  epigenetic  regulators  (e.g.,  DNA\nmethyltransferase  inhibitors,  histone  deacetylase  inhibitors,  methyl  donors)  could\ncounteract maladaptive  phenotypic  fixation  and  promote  re-differentiation  toward  the\noriginal cell type.\nConceptual Shift in Chronic Disease Management\nRather than targeting end-stage symptoms or viewing disease as irreversible, this model\nsupports  a  preventive  and  regenerative  approach—focusing  on  preserving  pattern\nfidelity, maintaining  matrix  integrity, and  interrupting  the  cycle  of substitution  before\nfunctional collapse.\nDiscussion\nThe  Dominant Substitution  Hypothesis provides a  unifying  framework to  explain  how\nchronic  environmental  disruption  can  reshape  tissue  identity  through  a  progressive,\nproportion-based mechanism. This model shifts the focus from singular causative events\n(e.g.,  mutations,  autoimmunity)  to  a  system-level  view  where  the  interplay  between\ninflammation,  cellular  adaptation,  and  loss  of  regenerative  cues  drives  long-term\ndysfunction.\n6\nAuthor-formatted, not peer-reviewed document posted on 03/02/2026. DOI:  \nhttps://doi.org/10.3897/arphapreprints.e187326\n\nStrengths of the Hypothesis\nThis  model  integrates  findings  from  disparate  fields—cell  biology,  immunology,\nepigenetics,  and  microbiome  research—into  a  coherent  explanation  for  a  class  of\npathologies  that  share  morphological  and  functional  features.  It  also  introduces  a\nquantifiable concept: the threshold at which maladaptive phenotypes dominate. This may\nhelp explain why interventions are more effective at early stages and why tissue recovery\nbecomes increasingly difficult once the original phenotype is marginalized.\nLimitations and Challenges\nAs  with  any  theoretical  model,  empirical  validation  is  essential.  While  supportive\nevidence exists in related domains, direct demonstration of substitution thresholds and\nproportion-driven  degeneration  requires  longitudinal  data,  high-resolution  tissue\nanalysis, and  well-controlled  experimental  models. Moreover, the  hypothesis may not\naccount for diseases with clearly monogenic origins or those triggered by acute, non-\nrepetitive insults.\nDistinguishing Adaptation from Mutation\nA  critical  clarification  lies  in  differentiating  epigenetically-driven  phenotypic  drift from\nirreversible mutational changes. The Dominant Substitution Hypothesis posits that many\nearly changes are adaptive and reversible—given the right microenvironmental reset.\nThis contrasts with models of disease that assume inevitable progression due to fixed\ngenetic damage.\nPathways for Experimental Testing\nFuture studies should aim to:\n• Track regenerative phenotypes over time in models of chronic inflammation\n• Quantify cell population ratios during disease onset and progression\n• Manipulate the extracellular matrix, cytokine profiles, and microbiota to assess\nphenotypic reversibility\n• Apply single-cell and spatial transcriptomics to detect early shifts in identity before\nmorphological transformation\nThese experiments will be key to validating the existence of regenerative substitution\nthresholds and exploring therapeutic strategies aimed at pattern restoration rather than\nsymptom suppression.\n7\nAuthor-formatted, not peer-reviewed document posted on 03/02/2026. DOI:  \nhttps://doi.org/10.3897/arphapreprints.e187326\n\nScope and Limitations of the Hypothesis\nThe Dominant Substitution Hypothesis is primarily applicable to tissues characterized by\nhigh cellular turnover and regenerative plasticity. These include epithelial surfaces (e.g.,\nendometrium,  intestinal  mucosa,  respiratory  lining),  mesothelial  tissues  (e.g.,\nperitoneum), and organs with known capacity for cellular renewal (e.g., liver, skin). In\nsuch  contexts, chronic  environmental  disruption  interacts  with  ongoing  regeneration,\nincreasing the risk of maladaptive phenotypic replacement.\nBy contrast, the hypothesis does not apply to tissues with limited regenerative capacity,\nsuch  as cardiac muscle, central  nervous system neurons, or mature  retinal  tissue. In\nthese organs, injury is more likely to result in cell death, scarring, or permanent loss of\nfunction, rather than  adaptive  phenotypic drift. Additionally, acute  or rapidly resolved\ninsults are unlikely to produce the slow threshold-based substitution described here.\nThus, this model should be understood as a framework for interpreting progressive tissue\ndysfunction  in  environments  where  chronic  stress,  attempted  regeneration,  and\nmicroenvironmental  distortion  co-exist over  time. It does  not aim  to  replace  existing\ngenetic  or  immunological  theories  of  disease,  but  to  complement  them  in  specific\nscenarios of chronic cellular adaptation.\nConclusions\nThe  Dominant Substitution  Hypothesis  reinterprets  chronic  tissue  degeneration  as  a\nprogressive  failure  of  regenerative  fidelity,  driven  by  environmental  disruption  and\nphenotypic  drift.  By  shifting  focus  from  isolated  pathological  events  to  systemic\ndegradation of pattern guidance, this model provides a plausible mechanism for a wide\nrange of conditions previously viewed as unrelated.\nThis framework challenges conventional interpretations of disease as purely mutational\nor autoimmune, offering a new lens grounded in regeneration dynamics and contextual\ncellular adaptation. If supported by experimental data, the hypothesis may pave the way\nfor  preventive  strategies  aimed at  preserving  cellular  identity,  reorganizing  the\nextracellular matrix, restoring epigenetic stability, and modulating the microenvironment\nbefore irreversible substitution occurs.\nUnderstanding degeneration as a result of the loss of original reference, rather than a\nrandom  error  or  irreversible  fate,  reopens  the  discussion  around  reversibility,  early\ndiagnostics, and  targeted regenerative  interventions. The  hypothesis lays conceptual\ngroundwork for a regenerative medicine approach based not solely on cell replacement,\nbut on the reactivation of lost guidance systems—the informational scaffolds that sustain\ntissue identity over time.\n8\nAuthor-formatted, not peer-reviewed document posted on 03/02/2026. DOI:  \nhttps://doi.org/10.3897/arphapreprints.e187326\n\nConflicts of interest\nThe authors have declared that no competing interests exist.\nReferences\n• Barker N, Clevers H (2010) Leucine-rich repeat-containing G-protein-coupled receptors\nas markers of adult stem cells. Gastroenterology 138 (5): 1681‑1696. https://doi.org/\n10.1053/j.gastro.2010.03.002\n• Belkaid Y , Hand TW (2014) Role of the microbiota in immunity and inflammation. Cell 157\n(1): 121‑141. https://doi.org/10.1016/j.cell.2014.03.011\n• Coussens LM, Werb Z (2012) Inflammation and cancer. Nature 420 (6917): 860‑867. \nhttps://doi.org/10.1038/nature01322\n• Feil R, Fraga MF (2012)  Epigenetics and the environment: emerging patterns and\nimplications. Nature Reviews Genetics 13 (2): 97‑109. https://doi.org/10.1038/nrg3142\n• Slack JMW (2007) Metaplasia and transdifferentiation: from pure biology to the clinic.\nNature Reviews Molecular Cell Biology 8 (5): 369‑378. https://doi.org/10.1038/nrm2146\n• Wynn TA, Ramalingam TR (2012) Mechanisms of fibrosis: therapeutic translation for\nfibrotic disease. Nature Medicine 18 (7): 1028‑1040. https://doi.org/10.1038/nm.2807\n• Zahir N, Weaver VM (2004) Death in the third dimension: apoptosis regulation and tissue\narchitecture. Current Opinion in Genetics & Development 14 (1): 71‑80. https://doi.org/\n10.1016/j.gde.2003.12.005\n• Zeisberg M, Neilson EG (2019) Biomarkers for epithelial-mesenchymal transitions. The\nJournal of Clinical Investigation 119 (6): 1429‑1437. https://doi.org/10.1172/JCI36183\n9\nAuthor-formatted, not peer-reviewed document posted on 03/02/2026. DOI:  \nhttps://doi.org/10.3897/arphapreprints.e187326","source_license":"CC0","license_restricted":false}