Genome Instability and Mutation Module

Oncology Module genome_instability_mutation 27 disorders Pathograph 4

A conserved mechanism module for the enabling characteristic of cancer (Hanahan & Weinberg): genome instability and mutation. Genome instability is the engine that generates the genetic diversity upon which selection acts during tumor evolution, accelerating acquisition of every hallmark capability. The conserved causal chain runs from an initiating insult that compromises genome integrity - inactivation of a "caretaker" genome-maintenance gene (mismatch repair, homologous recombination/BRCA, nucleotide-excision repair) and/or oncogene-induced DNA replication stress - through failure of DNA-damage surveillance and repair (frequently compounded by loss of the p53 and ATM/ATR checkpoint barriers), to an elevated mutation rate and chromosomal instability (the mutator phenotype). The resulting heritable diversity (point mutations, copy-number changes, aneuploidy, structural rearrangements) fuels clonal evolution and the stepwise acquisition of hallmark traits. Individual disorder entries declare conformance via conforms_to, substituting the tumor-type-specific caretaker lesion (e.g., MMR loss/microsatellite instability in Lynch syndrome, BRCA1/2 loss in HBOC, oncogene-induced replication stress in TP53/ATM-mutant sporadic cancers). The specific HRR/BRCA-deficiency therapeutic vulnerability is detailed in dna_repair_synthetic_lethality.

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Pathophysiology Nodes

4 shared nodes are defined in this module.

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Cell Types

No cell types are annotated for this module.

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Biological Processes

Notes

This is a mechanism module, not a specific disease. Disorder entries reference individual nodes via conforms_to (e.g., "genome_instability_mutation#Mutator Phenotype and Chromosomal Instability"). The module defines the expected pathophysiology structure; conforming nodes in disorder files should include the corresponding biological processes and causal edges, specialized to their tumor context. Key tumor-specific substitutions: Lynch syndrome uses mismatch-repair loss producing microsatellite instability and hypermutation; HBOC uses BRCA1/2-driven HRR deficiency; many sporadic cancers use oncogene-induced replication stress with TP53/ATM loss. The synthetic-lethal therapeutic exploitation of HRR deficiency (PARP inhibitors, platinum) is captured in dna_repair_synthetic_lethality. Key conformance target: "genome_instability_mutation#Mutator Phenotype and Chromosomal Instability".

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Module Collections

Hallmarks of Cancer as Genome instability and mutation

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Used By Disorder Entries

Acute Erythroid Leukemia via Chromothripsis and Complex or Monosomal Karyotype → Mutator Phenotype and Chromosomal Instability

Anaplastic Thyroid Carcinoma via TP53 Loss and p53-Mediated DNA Damage Response Failure → Mutator Phenotype and Chromosomal Instability

BARD1-related Cancer Predisposition via Genomic Instability and Homologous-Recombination Deficiency → Mutator Phenotype and Chromosomal Instability

Cadmium Poisoning via Zinc-Finger Displacement and DNA Repair Inhibition → Failure of DNA Damage Surveillance and Repair

Choroid Plexus Neoplasm via Chromosomal Instability and Aneuploidy → Mutator Phenotype and Chromosomal Instability

Constitutional Mismatch Repair Deficiency via Biallelic Germline Mismatch Repair Gene Inactivation → Genome-Maintenance Defect or Replication Stress , Constitutional Microsatellite Instability and Mutator Phenotype → Mutator Phenotype and Chromosomal Instability , Loss of MMR-Dependent Damage Signalling and Alkylating Agent Tolerance → Failure of DNA Damage Surveillance and Repair , Accelerated Multi-Organ Tumorigenesis → Accelerated Clonal Evolution

Esophageal Carcinoma via Chromosomal Instability and Mutator Phenotype → Mutator Phenotype and Chromosomal Instability

Ethmoid Sinus Adenocarcinoma via Inflammation-Associated TP53 Mutagenesis → Failure of DNA Damage Surveillance and Repair

Familial Nonmedullary Thyroid Carcinoma via Telomere-Telomerase Imbalance and Chromosome Fragility → Mutator Phenotype and Chromosomal Instability

Formaldehyde Poisoning via Saturation of crosslink repair capacity → Failure of DNA Damage Surveillance and Repair

Gastric Adenocarcinoma via Mismatch Repair Deficiency and Microsatellite Instability → Genome-Maintenance Defect or Replication Stress , Chromosomal Instability and Aneuploidy → Mutator Phenotype and Chromosomal Instability

Glioblastoma, IDH-Wildtype via Chromosome 7 Gain and Chromosome 10 Loss → Mutator Phenotype and Chromosomal Instability

Glioma via Chromosomal Copy-Number Alteration and Genomic Instability → Mutator Phenotype and Chromosomal Instability

Hepatocellular Carcinoma via Accumulation of Driver Mutations → Mutator Phenotype and Chromosomal Instability

Hereditary Breast and Ovarian Cancer Syndrome via Genomic Instability → Mutator Phenotype and Chromosomal Instability

Kidney Sarcoma via Subtype-Specific Driver Lesion Acquisition → Mutator Phenotype and Chromosomal Instability

Large Cell Neuroendocrine Carcinoma via Mutator Phenotype and Chromosomal Instability

Li-Fraumeni Syndrome via Genomic Instability → Mutator Phenotype and Chromosomal Instability

Lynch Syndrome via DNA Mismatch Repair Deficiency → Genome-Maintenance Defect or Replication Stress , Microsatellite Instability → Mutator Phenotype and Chromosomal Instability

MBD4-Related Tumor Predisposition Syndrome via Biallelic Germline MBD4 Loss of Function → Genome-Maintenance Defect or Replication Stress , Unrepaired G:T Mismatches from 5-Methylcytosine Deamination → Failure of DNA Damage Surveillance and Repair , CpG>TpG Hypermutator Phenotype → Mutator Phenotype and Chromosomal Instability

MBD4-Related Uveal Melanoma Predisposition via Unrepaired G:T Mismatches at Methyl-CpG in Tumor Cells → Failure of DNA Damage Surveillance and Repair , CpG>TpG Hypermutator Phenotype in Uveal Melanoma → Mutator Phenotype and Chromosomal Instability

MSI-High Colorectal Cancer via DNA Mismatch Repair Deficiency → Genome-Maintenance Defect or Replication Stress , Microsatellite Instability → Mutator Phenotype and Chromosomal Instability

MUTYH-Associated Polyposis via Biallelic Germline MUTYH Base-Excision-Repair Deficiency → Genome-Maintenance Defect or Replication Stress , Unrepaired 8-Oxoguanine Mispairs and G:C to T:A Transversion Mutator Phenotype → Mutator Phenotype and Chromosomal Instability

NTHL1-deficiency Tumor Predisposition Syndrome via Biallelic Germline NTHL1 Loss of Function → Genome-Maintenance Defect or Replication Stress , Failure to Excise Oxidized Pyrimidines → Failure of DNA Damage Surveillance and Repair , SBS30 C>T Transition Mutator Phenotype → Mutator Phenotype and Chromosomal Instability

Prostate Adenocarcinoma via Replication Stress-Driven Chromosomal Instability → Genome-Maintenance Defect or Replication Stress , Homologous Recombination Deficiency → Genome-Maintenance Defect or Replication Stress , CDK12-Associated Non-Canonical Homologous Recombination Impairment → Genome-Maintenance Defect or Replication Stress , Mismatch Repair Deficiency and Microsatellite Instability → Genome-Maintenance Defect or Replication Stress

Small Cell Lung Cancer via Genomic Instability → Mutator Phenotype and Chromosomal Instability

Triple-Negative Breast Cancer via Genomic Instability → Mutator Phenotype and Chromosomal Instability

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Pathograph

Use the checkboxes to hide or show graph categories. Hover nodes for evidence-backed metadata.

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Pathophysiology

Genome-Maintenance Defect or Replication Stress

trigger

Genome integrity is compromised by either inactivation of a caretaker genome-maintenance pathway (DNA mismatch repair, homologous-recombination repair/BRCA, nucleotide- or base-excision repair) or by oncogene-induced DNA replication stress, in which deregulated proliferative signaling forces aberrant origin firing and replication-fork collapse. Either insult increases the burden of unrepaired DNA lesions.

DNA Repair GO:0006281 ↓ DECREASED DNA Replication GO:0006260 ⚠ ABNORMAL

Used by disorders

Constitutional Mismatch Repair Deficiency as Biallelic Germline Mismatch Repair Gene Inactivation

Gastric Adenocarcinoma as Mismatch Repair Deficiency and Microsatellite Instability

Lynch Syndrome as DNA Mismatch Repair Deficiency

MBD4-Related Tumor Predisposition Syndrome as Biallelic Germline MBD4 Loss of Function

MSI-High Colorectal Cancer as DNA Mismatch Repair Deficiency

MUTYH-Associated Polyposis as Biallelic Germline MUTYH Base-Excision-Repair Deficiency

NTHL1-deficiency Tumor Predisposition Syndrome as Biallelic Germline NTHL1 Loss of Function

Prostate Adenocarcinoma as CDK12-Associated Non-Canonical Homologous Recombination Impairment

Prostate Adenocarcinoma as Homologous Recombination Deficiency

Prostate Adenocarcinoma as Mismatch Repair Deficiency and Microsatellite Instability

Prostate Adenocarcinoma as Replication Stress-Driven Chromosomal Instability

Downstream

Failure of DNA Damage Surveillance and Repair

Show evidence (1 reference)

PMID:20177397 SUPPORT Other

"In hereditary cancers, genomic instability results from mutations in DNA repair genes and drives cancer development, as predicted by the mutator hypothesis."

Establishes DNA-repair-gene defects as a source of genomic instability that drives cancer, the trigger of this module. Evidence source is OTHER because this is a review article.

Failure of DNA Damage Surveillance and Repair

effector

Accumulating DNA lesions are normally detected by the DNA-damage response (ATM/ATR-CHK signaling) and either repaired or, if irreparable, routed to p53-dependent arrest, senescence, or apoptosis. When repair is deficient and/or the checkpoint barrier is itself disabled (TP53, ATM, or CDKN2A loss), damaged cells continue to divide and propagate their lesions instead of being eliminated.

DNA Integrity Checkpoint Signaling GO:0031570 ↓ DECREASED DNA Damage Response GO:0006974 ⚠ ABNORMAL

Used by disorders

Cadmium Poisoning as Zinc-Finger Displacement and DNA Repair Inhibition

Constitutional Mismatch Repair Deficiency as Loss of MMR-Dependent Damage Signalling and Alkylating Agent Tolerance

Ethmoid Sinus Adenocarcinoma as Inflammation-Associated TP53 Mutagenesis

Formaldehyde Poisoning as Saturation of crosslink repair capacity

MBD4-Related Tumor Predisposition Syndrome as Unrepaired G:T Mismatches from 5-Methylcytosine Deamination

MBD4-Related Uveal Melanoma Predisposition as Unrepaired G:T Mismatches at Methyl-CpG in Tumor Cells

NTHL1-deficiency Tumor Predisposition Syndrome as Failure to Excise Oxidized Pyrimidines

Downstream

Mutator Phenotype and Chromosomal Instability

Show evidence (1 reference)

PMID:20177397 SUPPORT Other

"the mutation patterns of the tumour suppressor TP53 (which encodes p53), ataxia telangiectasia mutated (ATM) and cyclin-dependent kinase inhibitor 2A (CDKN2A; which encodes p16INK4A and p14ARF) support the oncogene-induced DNA replication stress model"

Links loss of the TP53/ATM/CDKN2A checkpoint barrier to oncogene-induced replication stress and genomic instability, the failure modeled in this node. Evidence source is OTHER because this is a review article.

Mutator Phenotype and Chromosomal Instability

central effector

The combination of defective repair and failed surveillance yields an elevated, heritable rate of genomic alteration - the mutator phenotype. Depending on the underlying defect this manifests as a hypermutated / microsatellite-unstable genome (MMR loss), a homologous-recombination-deficiency mutational signature (BRCA loss), or chromosomal instability with aneuploidy and structural rearrangements (replication stress, checkpoint loss). This is the conserved central node that disorder-specific caretaker lesions converge upon.

DNA Repair GO:0006281 ↓ DECREASED

Used by disorders

Acute Erythroid Leukemia as Chromothripsis and Complex or Monosomal Karyotype

Anaplastic Thyroid Carcinoma as TP53 Loss and p53-Mediated DNA Damage Response Failure

BARD1-related Cancer Predisposition as Genomic Instability and Homologous-Recombination Deficiency

Choroid Plexus Neoplasm as Chromosomal Instability and Aneuploidy

Constitutional Mismatch Repair Deficiency as Constitutional Microsatellite Instability and Mutator Phenotype

Esophageal Carcinoma as Chromosomal Instability and Mutator Phenotype

Familial Nonmedullary Thyroid Carcinoma as Telomere-Telomerase Imbalance and Chromosome Fragility

Gastric Adenocarcinoma as Chromosomal Instability and Aneuploidy

Glioblastoma, IDH-Wildtype as Chromosome 7 Gain and Chromosome 10 Loss

Glioma as Chromosomal Copy-Number Alteration and Genomic Instability

Hepatocellular Carcinoma as Accumulation of Driver Mutations

Hereditary Breast and Ovarian Cancer Syndrome as Genomic Instability

Kidney Sarcoma as Subtype-Specific Driver Lesion Acquisition

Large Cell Neuroendocrine Carcinoma

Li-Fraumeni Syndrome as Genomic Instability

Lynch Syndrome as Microsatellite Instability

MBD4-Related Tumor Predisposition Syndrome as CpG>TpG Hypermutator Phenotype

MBD4-Related Uveal Melanoma Predisposition as CpG>TpG Hypermutator Phenotype in Uveal Melanoma

MSI-High Colorectal Cancer as Microsatellite Instability

MUTYH-Associated Polyposis as Unrepaired 8-Oxoguanine Mispairs and G:C to T:A Transversion Mutator Phenotype

NTHL1-deficiency Tumor Predisposition Syndrome as SBS30 C>T Transition Mutator Phenotype

Small Cell Lung Cancer as Genomic Instability

Triple-Negative Breast Cancer as Genomic Instability

Downstream

Accelerated Clonal Evolution

Show evidence (1 reference)

PMID:20177397 SUPPORT Other

"Genomic instability is a characteristic of most cancers."

States that genomic instability is a characteristic of most cancers, the central effector (mutator phenotype/chromosomal instability) modeled here. Evidence source is OTHER because this is a review article.

Accelerated Clonal Evolution

consequence

The heritable genetic diversity generated by the mutator phenotype provides the substrate for Darwinian selection within the tumor. Variant subclones bearing advantageous alterations are selected and expand, accelerating the stepwise acquisition of the other hallmark capabilities (proliferative signaling, growth-suppressor evasion, immortality, invasion) and driving intratumoral heterogeneity, therapy resistance, and progression.

Used by disorders

Constitutional Mismatch Repair Deficiency as Accelerated Multi-Organ Tumorigenesis

Show evidence (1 reference)

PMID:21376230 SUPPORT Other

"Underlying these hallmarks are genome instability, which generates the genetic diversity that expedites their acquisition, and inflammation, which fosters multiple hallmark functions."

Hanahan & Weinberg define genome instability as the enabling characteristic that generates the genetic diversity expediting hallmark acquisition, the consequence modeled here. Evidence source is OTHER because this is a review article.