When the RAP (80) fades out, you can hear BRCA1 RING

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Updated: Oct 14, 2025

Silencing of BRCA2 to Identify Novel BRCA2-regulated Biological Functions in Cultured Human Cells
09:24

Silencing of BRCA2 to Identify Novel BRCA2-regulated Biological Functions in Cultured Human Cells

Published on: August 12, 2015

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Andreas Panagopoulos1, Matthias Altmeyer1

  • 1Department of Molecular Mechanisms of Disease, University of Zurich, Zurich, Switzerland.

EMBO Reports
|November 2, 2021
PubMed

Insights

The BRCA1 protein

Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • The tumor suppressor BRCA1 is crucial for DNA repair.
  • BRCA1 recruitment to DNA damage sites is not fully understood.
  • BARD1 is a known BRCA1 interaction partner involved in its function.

Purpose of the Study:

  • To investigate the role of RAP80 in BRCA1 recruitment to DNA damage sites.
  • To elucidate the mechanism of BRCA1 recruitment via the RAP80-BRCA1-A complex.
  • To explore therapeutic strategies targeting BRCA1 recruitment pathways.

Main Methods:

  • Utilized RAP80-deficient cells to study BRCA1 recruitment.
  • Assessed the function of the BRCA1 RING domain and its ubiquitin ligase activity.
  • Analyzed BRCA1 recruitment in the context of DNA repair.

Main Results:

  • RAP80 deficiency revealed a critical role for the BRCA1 RING domain in recruitment.
  • BRCA1's ubiquitin ligase activity is essential for this recruitment pathway.
  • Identified a second, RAP80-dependent route for BRCA1 recruitment.

Conclusions:

  • The RAP80-BRCA1-A axis provides a significant pathway for BRCA1 recruitment.
  • Targeting this RAP80 recruitment axis may restore therapeutic sensitivity in tumors with defective BRCA1.
  • BRCA1's RING domain and ubiquitin ligase activity are key to this repair function.

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