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Stem Cell Exhaustion Module

Aging Module stem_cell_exhaustion 3 disorders Pathograph 3
A conserved mechanism module for the hallmark of aging (Lopez-Otin et al.) termed stem cell exhaustion: the age-associated decline in the number and function of tissue-specific stem cells, which erodes the regenerative capacity needed to maintain tissue homeostasis. Adult stem cells sustain tissue health by self-renewal and differentiation; with age, accumulated genetic mutations, epigenetic changes, and an altered extrinsic (niche/systemic) environment progressively impair stem-cell functionality. The resulting decline in self-renewal and regenerative output leaves tissues unable to replace lost or damaged cells, contributing to the functional decline of blood, muscle, brain, and other regenerative tissues. Stem cell exhaustion is an integrative hallmark - a downstream convergence of the primary damage hallmarks (genomic instability, telomere attrition, epigenetic alterations) acting on the stem compartment. Individual disorder entries declare conformance via conforms_to on their pathophysiology nodes, substituting the tissue-specific stem population and driver (e.g. hematopoietic stem cell aging, satellite-cell decline, accelerated stem-cell aging in progeroid syndromes) while preserving the conserved damage -> functional-decline -> regenerative-failure chain.
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Pathophysiology Nodes

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3 shared nodes are defined in this module.
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Cell Types

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Stem Cell CL:0000034 Cell Ontology (CL) Relation: this mechanism module involves this cell type This mechanism module involves Stem Cell (CL:0000034). CL:0000034 is a cell type from the Cell Ontology. Hematopoietic Stem Cell CL:0000037 Cell Ontology (CL) Relation: this mechanism module involves this cell type This mechanism module involves Hematopoietic Stem Cell (CL:0000037). CL:0000037 is a cell type from the Cell Ontology.
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Biological Processes

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Stem Cell Population Maintenance GO:0019827 Gene Ontology (GO) Relation: this mechanism module involves this biological process This mechanism module involves decreased Stem Cell Population Maintenance (GO:0019827). GO:0019827 is a biological process from the Gene Ontology. DECREASED Tissue Regeneration GO:0042246 Gene Ontology (GO) Relation: this mechanism module involves this biological process This mechanism module involves decreased Tissue Regeneration (GO:0042246). GO:0042246 is a biological process from the Gene Ontology. DECREASED
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Notes

This is a mechanism module, not a specific disease. Disorder entries reference individual nodes via conforms_to (e.g., "stem_cell_exhaustion#Decline in Stem Cell Self-Renewal and Function"). Conforming nodes in disorder files should include the corresponding biological processes and causal edges, specialized to their disease context, substituting the tissue-specific stem-cell population. Stem cell exhaustion is an integrative hallmark: it sits downstream of the primary-damage modules (telomere_attrition, epigenetic_alterations, genome_instability_mutation) and overlaps cellular_senescence when stem cells senesce. Key conformance target: "stem_cell_exhaustion#Decline in Stem Cell Self-Renewal and Function".
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Used By Disorder Entries

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Ageing Associated Decline in Intrinsic Capacity via Decline in Tissue Regenerative Reserve → Decline in Stem Cell Self-Renewal and Function
Idiopathic Pulmonary Fibrosis via AT2 progenitor exhaustion and impaired alveolar regeneration → Decline in Stem Cell Self-Renewal and Function
Sarcopenia via Muscle Satellite Cell Exhaustion → Decline in Stem Cell Self-Renewal and Function
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Pathograph

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Pathograph: causal mechanism network for Stem Cell Exhaustion Module Interactive directed graph showing how this shared module's pathophysiology nodes connect.
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Pathophysiology

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Stem Cell Genetic, Epigenetic, and Niche Damage
trigger
Over the lifespan, tissue-specific stem cells accumulate genetic mutations and epigenetic changes and are exposed to a progressively altered extrinsic environment (niche and systemic milieu). These intrinsic and extrinsic insults interact to compromise stem-cell functionality, the initiating layer of the hallmark.
Stem Cell CL:0000034 Cell Ontology (CL) Relation: this pathophysiological event involves this cell type This pathophysiological event involves Stem Cell (CL:0000034). CL:0000034 is a cell type from the Cell Ontology.
Downstream
  • Decline in Stem Cell Self-Renewal and Function
Decline in Stem Cell Self-Renewal and Function
central effector
The accumulated damage leads to an age-associated decline in stem-cell function - reduced self-renewal capacity and impaired maintenance of the stem-cell pool. This is the conserved central effector that tissue-specific stem-cell aging (e.g. hematopoietic stem cells) converges upon; conforming disorder nodes substitute their particular stem population.
Hematopoietic Stem Cell CL:0000037 Cell Ontology (CL) Relation: this pathophysiological event involves this cell type This pathophysiological event involves Hematopoietic Stem Cell (CL:0000037). CL:0000037 is a cell type from the Cell Ontology.
Stem Cell Population Maintenance GO:0019827 Gene Ontology (GO) Relation: this pathophysiological event involves this biological process This pathophysiological event involves decreased Stem Cell Population Maintenance (GO:0019827). GO:0019827 is a biological process from the Gene Ontology. DECREASED
Used by disorders
Ageing Associated Decline in Intrinsic Capacity as Decline in Tissue Regenerative Reserve
Idiopathic Pulmonary Fibrosis as AT2 progenitor exhaustion and impaired alveolar regeneration
Sarcopenia as Muscle Satellite Cell Exhaustion
Downstream
  • Regenerative Failure and Tissue Homeostasis Decline
Regenerative Failure and Tissue Homeostasis Decline
consequence
Diminished stem-cell self-renewal and function reduce the regenerative capacity of somatic tissues, so lost or damaged cells are no longer adequately replaced and tissue homeostasis declines with age. This is the conserved consequence of stem cell exhaustion; the specific organ phenotype is supplied by the conforming disorder, and enhancing regenerative capacity is the corresponding healthy-aging intervention target.
Tissue Regeneration GO:0042246 Gene Ontology (GO) Relation: this pathophysiological event involves this biological process This pathophysiological event involves decreased Tissue Regeneration (GO:0042246). GO:0042246 is a biological process from the Gene Ontology. DECREASED