Related Experiment Video

Updated: Jul 12, 2025

Identifying the Effects of BRCA1 Mutations on Homologous Recombination using Cells that Express Endogenous Wild-type BRCA1
08:53

Identifying the Effects of BRCA1 Mutations on Homologous Recombination using Cells that Express Endogenous Wild-type BRCA1

Published on: February 17, 2011

14.7K

Widespread BRCA1/2-independent homologous recombination defects are caused by alterations in RNA-binding proteins

Daniel J McGrail1, Yang Li2, Roger S Smith3

  • 1Center for Immunotherapy and Precision Immuno-Oncology, Cleveland Clinic, Cleveland, OH 44106, USA; Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44106, USA.

Cell Reports. Medicine
|November 1, 2023
PubMed

Insights

Defects in homologous recombination DNA repair (HRD) are linked to cancer. This study reveals new genes, particularly RNA-binding proteins, that cause HRD beyond BRCA1/2, improving cancer screening and treatment.

Area of Science:

  • Genomics
  • Molecular Biology
  • Cancer Research

Background:

  • Defects in homologous recombination DNA repair (HRD) contribute to cancer development and create therapeutic vulnerabilities.
  • Mutations in canonical HR genes like BRCA1/2 explain only 10-20% of tumors with genomic HRD.
  • A comprehensive understanding of HRD drivers is crucial for cancer diagnostics and therapeutics.

Purpose of the Study:

  • To identify novel genetic drivers of homologous recombination DNA repair (HRD) beyond established genes.
  • To explore the role of RNA-binding proteins (RBPs) in HRD.
  • To expand the repertoire of genes implicated in HRD for improved clinical applications.

Main Methods:

  • Utilized a networks-based approach to discover novel HRD-associated genes.
  • Experimentally validated putative HRD drivers.
  • Cross-validated findings in an independent patient cohort.
  • Analyzed enrichment in cancer-associated genome-wide association study (GWAS) loci.

Main Results:

  • Over half of identified HRD drivers were outside of canonical DNA damage response genes.
  • RNA-binding protein (RBP)-encoding genes were significantly enriched among HRD drivers.
  • Validated RBPs function in DNA damage repair or regulate expression of HR genes.
  • Identified novel genetic contributors to HRD, expanding beyond BRCA1/2.

Conclusions:

  • The study significantly expands the known drivers of homologous recombination DNA repair (HRD).
  • RNA-binding proteins represent a critical, previously underappreciated class of HRD genes.
  • Findings have implications for genetic screening, basic cancer biology, and therapy stratification.
Keywords:
BRCA1BRCA2DNA damagePARP inhibitorsRNA binding proteinsbreast cancerhereditary cancerhomologous recombinationnetwork biology

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