Related Experiment Video

Updated: Dec 24, 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

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Proper chromosome alignment depends on BRCA2 phosphorylation by PLK1

Åsa Ehlén1,2, Charlotte Martin1,2, Simona Miron3

  • 1Institut Curie, PSL Research University, CNRS, UMR3348, F-91405, Orsay, France.

Nature Communications
|April 15, 2020
PubMed

Insights

BRCA2 phosphorylation by PLK1 is crucial for accurate chromosome segregation during mitosis. Disrupting this interaction leads to chromosome instability and aneuploidy, common in BRCA2-mutated cancers.

Area of Science:

  • Cell Biology
  • Genetics
  • Cancer Research

Background:

  • BRCA2 protein maintains genome integrity via homologous recombination.
  • During mitosis, BRCA2 is phosphorylated by Polo-like kinase 1 (PLK1).

Purpose of the Study:

  • To elucidate the role of BRCA2 phosphorylation by PLK1 in mitotic control.
  • To investigate the functional consequences of altered BRCA2-PLK1 interactions.

Main Methods:

  • Identification of a conserved phosphorylation site (T207) on BRCA2 for PLK1 docking.
  • Analysis of the BRCA2-PLK1-PP2A-phospho-BUBR1 complex formation.
  • Assessment of mitotic defects in BRCA2 variants (S206C, T207A).

Main Results:

  • Phosphorylation at T207 creates a docking site for PLK1 on BRCA2.
  • BRCA2-PLK1 interaction is essential for a stable complex with PP2A and BUBR1.
  • BRCA2 variants impairing PLK1 binding cause kinetochore instability, chromosome misalignment, and aneuploidy.

Conclusions:

  • BRCA2 plays a critical role in chromosome alignment during mitosis, independent of its DNA repair function.
  • Defects in BRCA2-PLK1 interaction contribute to aneuploidy and may explain genomic instability in BRCA2-mutated tumors.

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