BRD4 promotes resection and homology-directed repair of DNA double-strand breaks.

BRD4 promotes resection and homology-directed repair of DNA double-strand breaks.
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BRD4促进DNA双链断裂的切除和同源定向修复。

DOI:
10.1038/s41467-022-30787-6
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发表时间:
2022-05-31
影响因子:
16.6
通讯作者:
Long, David T.
Long, David T.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Barrows, John K.;Lin, Baicheng;Quaas, Colleen E.;Fullbright, George;Wallace, Elizabeth N.;Long, David T.

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双链断裂(DSB)是DNA损伤的最毒性形式之一,是基因组不稳定性的主要来源。布罗莫结构域和额外末端(BET)蛋白家族的成员被表征为调节基因表达的表观遗传阅读器。然而,有证据表明BET蛋白在DNA修复中也起着更直接的作用。在这里,我们建立了一个无细胞系统,使用爪蟾卵提取物,以阐明基因表达无关的BET蛋白在DSB修复功能。我们确定BET蛋白BRD 4作为同源重组的一个重要调节因子,并描述了它在刺激DNA加工中的作用,通过与SWI/SNF染色质重塑复合物和切除机制的相互作用。这些结果确立了BRD 4作为连接转录活性和同源定向修复的染色质结合的多功能调节剂。BRD 4是染色质结合的多功能调节剂,在DNA双链断裂修复中起直接作用。BRD 4与SWI/SNF染色质重塑复合物和切除机制相互作用以促进同源重组。
Double-strand breaks (DSBs) are one of the most toxic forms of DNA damage and represent a major source of genomic instability. Members of the bromodomain and extra-terminal (BET) protein family are characterized as epigenetic readers that regulate gene expression. However, evidence suggests that BET proteins also play a more direct role in DNA repair. Here, we establish a cell-free system using Xenopus egg extracts to elucidate the gene expression-independent functions of BET proteins in DSB repair. We identify the BET protein BRD4 as a critical regulator of homologous recombination and describe its role in stimulating DNA processing through interactions with the SWI/SNF chromatin remodeling complex and resection machinery. These results establish BRD4 as a multifunctional regulator of chromatin binding that links transcriptional activity and homology-directed repair. BRD4 is a multifunctional regulator of chromatin binding that plays a direct role in DNA double-strand break repair. BRD4 interacts with the SWI/SNF chromatin remodeling complex and resection machinery to promote homologous recombination.
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