Replication Fork Reversal during DNA Interstrand Crosslink Repair Requires CMG Unloading.
Replication Fork Reversal during DNA Interstrand Crosslink Repair Requires CMG Unloading.
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DOI:
10.1016/j.celrep.2018.05.061
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发表时间:
2018-06-19
期刊:
影响因子:
8.8
通讯作者:
Walter JC
中科院分区:
文献类型:
--
作者:
Amunugama R;Willcox S;Wu RA;Abdullah UB;El-Sagheer AH;Brown T;McHugh PJ;Griffith JD;Walter JC
DNA interstrand crosslinks (ICLs) are extremely cytotoxic, but the mechanism of their repair remains incompletely understood. Using Xenopus egg extracts, we previously showed that repair of a cisplatin ICL is triggered when two replication forks converge on the lesion. After CDC45/MCM2-7/GINS (CMG) ubiquitylation and unloading by the p97 segregase, FANCI-FANCD2 promotes DNA incisions by XPF-ERCC1, leading to ICL unhooking. Here, we report that, during this cell-free ICL repair reaction, one of the two converged forks undergoes reversal. Fork reversal fails when CMG unloading is inhibited, but it does not require FANCI-FANCD2. After one fork has undergone reversal, the opposing fork that still abuts the ICL undergoes incisions. Our data show that replication fork reversal at an ICL requires replisome disassembly. We present a revised model of ICL repair that involves a reversed fork intermediate. DNA interstrand crosslinks (ICLs) are extremely cytotoxic lesions that are mainly repaired in a replication-coupled manner. Using a cell-free system, Amunugama et al. report that, during ICL repair, replication forks undergo reversal. Fork reversal requires replicative CMG helicase unloading.
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DOI:
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发表时间:
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期刊:
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DOI:
10.1056/nejmra0809889
发表时间:
2010-05-20
期刊:
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影响因子:
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DOI:
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发表时间:
2009-12-18
期刊:
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影响因子:
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