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BRCA1 Haploinsufficiency Is Masked by RNF168-Mediated Chromatin Ubiquitylation.

Abstract：

:BRCA1 functions at two distinct steps during homologous recombination (HR). Initially, it promotes DNA end resection, and subsequently it recruits the PALB2 and BRCA2 mediator complex, which stabilizes RAD51-DNA nucleoprotein filaments. Loss of 53BP1 rescues the HR defect in BRCA1-deficient cells by increasing resection, suggesting that BRCA1's downstream role in RAD51 loading is dispensable when 53BP1 is absent. Here we show that the E3 ubiquitin ligase RNF168, in addition to its canonical role in inhibiting end resection, acts in a redundant manner with BRCA1 to load PALB2 onto damaged DNA. Loss of RNF168 negates the synthetic rescue of BRCA1 deficiency by 53BP1 deletion, and it predisposes BRCA1 heterozygous mice to cancer. BRCA1+/-RNF168-/- cells lack RAD51 foci and are hypersensitive to PARP inhibitor, whereas forced targeting of PALB2 to DNA breaks in mutant cells circumvents BRCA1 haploinsufficiency. Inhibiting the chromatin ubiquitin pathway may, therefore, be a synthetic lethality strategy for BRCA1-deficient cancers.

journal_name

Mol Cell

journal_title

Molecular cell

authors

Zong D,Adam S,Wang Y,Sasanuma H,Callén E,Murga M,Day A,Kruhlak MJ,Wong N,Munro M,Ray Chaudhuri A,Karim B,Xia B,Takeda S,Johnson N,Durocher D,Nussenzweig A

doi

10.1016/j.molcel.2018.12.010

subject

Has Abstract

pub_date

2019-03-21 00:00:00

pages

1267-1281.e7

issue

6

eissn

1097-2765

issn

1097-4164

pii

S1097-2765(18)31064-5

journal_volume

73

pub_type

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