Nap1 stimulates homologous recombination by RAD51 and RAD54 in higher-ordered chromatin containing histone H1.

Nap1 stimulates homologous recombination by RAD51 and RAD54 in higher-ordered chromatin containing histone H1.
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DOI:
10.1038/srep04863
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发表时间:
2014-05-06
期刊:
影响因子:
4.6
通讯作者:
Kurumizaka H
Kurumizaka H
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Machida S;Takaku M;Ikura M;Sun J;Suzuki H;Kobayashi W;Kinomura A;Osakabe A;Tachiwana H;Horikoshi Y;Fukuto A;Matsuda R;Ura K;Tashiro S;Ikura T;Kurumizaka H

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同源重组在有丝分裂DNA双链断裂(DSB)修复和减数分裂遗传重组中起重要作用。在真核生物中,RAD 51促进同源重组过程中的中心同源配对步骤,但不足以克服核小体施加的反应屏障。RAD 54是ATP依赖性核小体重塑因子家族的成员,在核小体DNA中促进RAD 51介导的同源配对。在高等真核生物中,大多数核小体形成含有连接体组蛋白H1的高级染色质。然而,RAD 51/RAD 54介导的同源配对发生在高阶染色质中的机制尚未阐明。在这项研究中,我们发现组蛋白伴侣Nap 1在人类细胞的DSB位点上积累,并且在Nap 1敲低的细胞中DSB修复大大减少。我们确定Nap 1结合到RAD 54,通过驱逐组蛋白H1增强RAD 54介导的核小体重塑,并最终刺激含有组蛋白H1的高阶染色质中的RAD 51介导的同源配对。
Homologous recombination plays essential roles in mitotic DNA double strand break (DSB) repair and meiotic genetic recombination. In eukaryotes, RAD51 promotes the central homologous-pairing step during homologous recombination, but is not sufficient to overcome the reaction barrier imposed by nucleosomes. RAD54, a member of the ATP-dependent nucleosome remodeling factor family, is required to promote the RAD51-mediated homologous pairing in nucleosomal DNA. In higher eukaryotes, most nucleosomes form higher-ordered chromatin containing the linker histone H1. However, the mechanism by which RAD51/RAD54-mediated homologous pairing occurs in higher-ordered chromatin has not been elucidated. In this study, we found that a histone chaperone, Nap1, accumulates on DSB sites in human cells, and DSB repair is substantially decreased in Nap1-knockdown cells. We determined that Nap1 binds to RAD54, enhances the RAD54-mediated nucleosome remodeling by evicting histone H1, and eventually stimulates the RAD51-mediated homologous pairing in higher-ordered chromatin containing histone H1.
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