PSIP1/LEDGF reduces R-loops at transcription sites to maintain genome integrity

PSIP1/LEDGF reduces R-loops at transcription sites to maintain genome integrity
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PSIP1/LEDGF 减少转录位点的 R 环以维持基因组完整性

DOI:
10.1101/2022.12.02.518862
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发表时间:
2022
期刊:
--
影响因子:
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通讯作者:
Jayakumar S
Jayakumar S
中科院分区:
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文献类型:
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作者:
Jayakumar S

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在转录位点积累的R环对基因组完整性构成持续的威胁。PSIP 1是一种与转录延伸复合物相关的染色质蛋白,具有组蛋白伴侣活性,并参与将RNA加工和DNA修复因子募集到转录位点。在这里,我们表明PSIP 1与R环和其他参与R环稳态的蛋白质相互作用,包括PARP 1。在PSIP 1缺失的人类和小鼠细胞系中PSIP 1、R环和γ-H2 AX的全基因组定位显示,在PSIP 1缺失的情况下,基因启动子处的R环和DNA损伤积累。R-loop的积累导致局部转录停滞和转录-复制冲突,导致DNA损伤。PSIP 1缺失增加53 BP 1病灶并减少RAD 51病灶,表明改变的DNA修复选择。此外,PSIP 1缺失增加了癌细胞对PARP 1抑制剂和DNA损伤剂的敏感性,这些药物会诱导R环诱导的DNA损伤。这些发现为PSIP 1在转录位点维持基因组完整性的机制提供了见解。
R-loops that accumulate at transcription sites pose a persistent threat to genome integrity. PSIP1 is a chromatin protein associated with transcriptional elongation complex, possesses histone chaperone activity, and is implicated in recruiting RNA processing and DNA repair factors to transcription sites. Here, we show that PSIP1 interacts with R-loops and other proteins involved in R-loop homeostasis, including PARP1. Genome-wide mapping of PSIP1, R-loops and γ-H2AX in PSIP1-depleted human and mouse cell lines revealed an accumulation of R-loops and DNA damage at gene promoters in the absence of PSIP1. R-loop accumulation causes local transcriptional arrest and transcription-replication conflict, leading to DNA damage. PSIP1 depletion increases 53BP1 foci and reduces RAD51 foci, suggesting altered DNA repair choice. Furthermore, PSIP1 depletion increases the sensitivity of cancer cells to PARP1 inhibitors and DNA-damaging agents that induce R-loop-induced DNA damage. These findings provide insights into the mechanism through which PSIP1 maintains genome integrity at the site of transcription.
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