LAP2α preserves genome integrity through assisting RPA deposition on damaged chromatin.
LAP2α preserves genome integrity through assisting RPA deposition on damaged chromatin.
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LAP2α 通过协助 RPA 在受损染色质上沉积来保持基因组完整性
DOI:
10.1186/s13059-022-02638-6
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发表时间:
2022-02-28
期刊:
影响因子:
12.3
通讯作者:
Shi L
中科院分区:
文献类型:
--
作者:
Bao K;Zhang Q;Liu S;Song N;Guo Q;Liu L;Tian S;Hao J;Zhu Y;Zhang K;Ai D;Yang J;Yao Z;Foisner R;Shi L
Single-stranded DNA (ssDNA) coated with replication protein A (RPA) acts as a key platform for the recruitment and exchange of genome maintenance factors in DNA damage response. Yet, how the formation of the ssDNA-RPA intermediate is regulated remains elusive. Here, we report that the lamin-associated protein LAP2α is physically associated with RPA, and LAP2α preferentially facilitates RPA deposition on damaged chromatin via physical contacts between LAP2α and RPA1. Importantly, LAP2α-promoted RPA binding to ssDNA plays a critical role in protection of replication forks, activation of ATR, and repair of damaged DNA. We further demonstrate that the preference of LAP2α-promoted RPA loading on damaged chromatin depends on poly ADP-ribose polymerase PARP1, but not poly(ADP-ribosyl)ation. Our study provides mechanistic insight into RPA deposition in response to DNA damage and reveals a genome protection role of LAP2α. The online version contains supplementary material available at 10.1186/s13059-022-02638-6.
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