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Summary
This summary is machine-generated.

Defective DNA repair, particularly single-strand break repair, drives cancer progression in BRCA-wildtype tumors. This leads to replicative instability (RIN), causing therapy resistance and metastasis.

Keywords:
MYBL2cancer progressionmetastasisreplicative instability (RIN)single-strand break repairtranslesion synthesis

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Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Defective DNA repair is linked to cancer progression and poor survival.
  • Genomic instability is observed in BRCA-inactivated tumors and also in BRCA-wildtype tumors.
  • A pan-cancer mechanism for genomic instability in BRCA-wildtype tumors remains to be identified.

Purpose of the Study:

  • To identify a pan-cancer mechanism driving genomic instability and cancer progression in BRCA-wildtype tumors.
  • To analyze multi-omics data for genetic underpinnings of genomic instability in BRCA-wildtype cancers.
  • To investigate the clinical implications of genomic instability, including therapy response and metastasis.

Main Methods:

  • Utilized multi-omics data from two independent consortia across diverse tumor types.
  • Developed novel metrics to identify genetic drivers of genomic instability in BRCA-wildtype tumors.
  • Analyzed clinical data for patient outcomes, therapy responses, and metastatic patterns.

Main Results:

  • Defects in single-strand break repair, translesion synthesis, and non-homologous end-joining drive genomic instability in BRCA-wildtype tumors.
  • Loss of these DNA repair pathways promotes replication stress, therapy resistance, and brain metastasis.
  • Identified a new pan-cancer class: replicative instability (RIN), characterized by copy number alterations at replication stress-sensitive sites.

Conclusions:

  • Replicative instability (RIN) is a novel pan-cancer mechanism associated with accelerated cancer progression.
  • RIN drives tumor evolution through copy number alterations and transcriptional rewiring.
  • RIN is clinically significant, correlating with therapy resistance and distant metastases across multiple cancer types.