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MCM8IP activates the MCM8-9 helicase to promote DNA synthesis and homologous recombination upon DNA damage.

Abstract：

:Homologous recombination (HR) mediates the error-free repair of DNA double-strand breaks to maintain genomic stability. Here we characterize C17orf53/MCM8IP, an OB-fold containing protein that binds ssDNA, as a DNA repair factor involved in HR. MCM8IP-deficient cells exhibit HR defects, especially in long-tract gene conversion, occurring downstream of RAD51 loading, consistent with a role for MCM8IP in HR-dependent DNA synthesis. Moreover, loss of MCM8IP confers cellular sensitivity to crosslinking agents and PARP inhibition. Importantly, we report that MCM8IP directly associates with MCM8-9, a helicase complex mutated in primary ovarian insufficiency, and RPA1. We additionally show that the interactions of MCM8IP with MCM8-9 and RPA facilitate HR and promote replication fork progression and cellular viability in response to treatment with crosslinking agents. Mechanistically, MCM8IP stimulates the helicase activity of MCM8-9. Collectively, our work identifies MCM8IP as a key regulator of MCM8-9-dependent DNA synthesis during DNA recombination and replication.

journal_name

Nat Commun

journal_title

Nature communications

authors

Huang JW,Acharya A,Taglialatela A,Nambiar TS,Cuella-Martin R,Leuzzi G,Hayward SB,Joseph SA,Brunette GJ,Anand R,Soni RK,Clark NL,Bernstein KA,Cejka P,Ciccia A

doi

10.1038/s41467-020-16718-3

subject

Has Abstract

pub_date

2020-06-11 00:00:00

pages

2948

issue

1

issn

2041-1723

pii

10.1038/s41467-020-16718-3

journal_volume

11

pub_type

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