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The BRCA2-MEILB2-BRME1 complex governs meiotic recombination and impairs the mitotic BRCA2-RAD51 function in cancer cells
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The BRCA2-MEILB2-BRME1 complex governs meiotic recombination and impairs the mitotic BRCA2-RAD51 function in cancer cells
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Journal Article
The BRCA2-MEILB2-BRME1 complex governs meiotic recombination and impairs the mitotic BRCA2-RAD51 function in cancer cells
2020
Overview
Breast cancer susceptibility gene II (
BRCA2
) is central in homologous recombination (HR). In meiosis, BRCA2 binds to MEILB2 to localize to DNA double-strand breaks (DSBs). Here, we identify BRCA2 and MEILB2-associating protein 1 (BRME1), which functions as a stabilizer of MEILB2 by binding to an α-helical N-terminus of MEILB2 and preventing MEILB2 self-association. BRCA2 binds to the C-terminus of MEILB2, resulting in the formation of the BRCA2-MEILB2-BRME1 ternary complex. In
Brme1
knockout (
Brme1
−/−
) mice, the BRCA2-MEILB2 complex is destabilized, leading to defects in DSB repair, homolog synapsis, and crossover formation. Persistent DSBs in
Brme1
−/−
reactivate the somatic-like DNA-damage response, which repairs DSBs but cannot complement the crossover formation defects. Further, MEILB2-BRME1 is activated in many human cancers, and somatically expressed MEILB2-BRME1 impairs mitotic HR. Thus, the meiotic BRCA2 complex is central in meiotic HR, and its misregulation is implicated in cancer development.
In meiosis, BRCA2 associates to MEILB2 localising at DNA double-strand breaks (DSBs). Here, the authors identify BRCA2 and MEILB2- associating protein 1 termed BRME1 to work together in regulating meiotic recombination.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 13/1
/ 13/2
/ 13/51
/ 14/1
/ 14/35
/ 14/63
/ 38
/ 38/77
/ Alleles
/ Animals
/ Biologi
/ Cancer
/ Defects
/ DNA
/ Homologous Recombination - genetics
/ Homology
/ Humanities and Social Sciences
/ Male
/ Meiosis
/ Multiprotein Complexes - metabolism
/ Proteins
/ Rad51 Recombinase - metabolism
/ Science
/ Yeast
