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2017 ; 8
(ä): 15751
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gab.com Text
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English Wikipedia
The anaphase promoting complex impacts repair choice by protecting ubiquitin
signalling at DNA damage sites
#MMPMID28604711
Ha K
; Ma C
; Lin H
; Tang L
; Lian Z
; Zhao F
; Li JM
; Zhen B
; Pei H
; Han S
; Malumbres M
; Jin J
; Chen H
; Zhao Y
; Zhu Q
; Zhang P
Nat Commun
2017[Jun]; 8
(ä): 15751
PMID28604711
show ga
Double-strand breaks (DSBs) are repaired through two major pathways,
homology-directed recombination (HDR) and non-homologous end joining (NHEJ).
While HDR can only occur in S/G2, NHEJ can happen in all cell cycle phases
(except mitosis). How then is the repair choice made in S/G2 cells? Here we
provide evidence demonstrating that APC(Cdh1) plays a critical role in choosing
the repair pathways in S/G2 cells. Our results suggest that the default for all
DSBs is to recruit 53BP1 and RIF1. BRCA1 is blocked from being recruited to
broken ends because its recruitment signal, K63-linked poly-ubiquitin chains on
histones, is actively destroyed by the deubiquitinating enzyme USP1. We show that
the removal of USP1 depends on APC(Cdh1) and requires Chk1 activation known to be
catalysed by ssDNA-RPA-ATR signalling at the ends designated for HDR, linking the
status of end processing to RIF1 or BRCA1 recruitment.