RIF1-ASF1-mediated high-order chromatin structure safeguards genome integrity.

RIF1-ASF1-mediated high-order chromatin structure safeguards genome integrity.
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DOI:
10.1038/s41467-022-28588-y
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发表时间:
2022-02-17
影响因子:
16.6
通讯作者:
Xu D
Xu D
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Feng S;Ma S;Li K;Gao S;Ning S;Shang J;Guo R;Chen Y;Blumenfeld B;Simon I;Li Q;Guo R;Xu D

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53 BP 1-RIF 1通路拮抗DNA断裂末端的切除,并赋予BRCA 1突变肿瘤对PARP抑制剂的敏感性。然而,目前尚不清楚该途径如何抑制切除的启动。在这里,我们确定ASF 1作为合作伙伴的RIF 1通过类似的相互作用方式与组蛋白伴侣CAF-1和HIRA的相互作用。ASF 1通过53 BP 1-RIF 1募集到远端染色质侧翼DNA断裂,并利用其组蛋白伴侣活性促进非同源末端连接(NHEJ)。上位性分析表明,ASF 1与RIF 1在相同的NHEJ通路中起作用,但通过与shieldin复合物的平行通路起作用,该复合物在起始后抑制切除。此外,在BRCA 1缺陷细胞中末端切除和同源重组(HR)的缺陷在很大程度上受到ASF 1缺陷的抑制。从机制上讲,ASF 1通过异染色质化压缩相邻的染色质,以保护断裂的DNA末端免受BRCA 1介导的切除。总之,我们的研究结果确定了一个RIF 1-ASF 1组蛋白伴侣复合物,促进高阶染色质结构的变化,以刺激DSB修复的NHEJ途径。53 BP 1-RIF 1通路对于DNA修复是重要的。在这里,作者鉴定了组蛋白伴侣ASF 1,其通过改变高阶染色质结构作为DNA末端切除的抑制剂,作为RIF 1的伴侣。这一发现将DNA修复和高阶染色质结构的动态变化联系起来。
The 53BP1-RIF1 pathway antagonizes resection of DNA broken ends and confers PARP inhibitor sensitivity on BRCA1-mutated tumors. However, it is unclear how this pathway suppresses initiation of resection. Here, we identify ASF1 as a partner of RIF1 via an interacting manner similar to its interactions with histone chaperones CAF-1 and HIRA. ASF1 is recruited to distal chromatin flanking DNA breaks by 53BP1-RIF1 and promotes non-homologous end joining (NHEJ) using its histone chaperone activity. Epistasis analysis shows that ASF1 acts in the same NHEJ pathway as RIF1, but via a parallel pathway with the shieldin complex, which suppresses resection after initiation. Moreover, defects in end resection and homologous recombination (HR) in BRCA1-deficient cells are largely suppressed by ASF1 deficiency. Mechanistically, ASF1 compacts adjacent chromatin by heterochromatinization to protect broken DNA ends from BRCA1-mediated resection. Taken together, our findings identify a RIF1-ASF1 histone chaperone complex that promotes changes in high-order chromatin structure to stimulate the NHEJ pathway for DSB repair. The 53BP1-RIF1 pathway is important for DNA repair. Here, the authors identified the histone chaperone ASF1, which functions as a suppressor of DNA end resection through changing high-order chromatin structure, as a partner of RIF1. This finding links DNA repair and dynamic changes of high-order chromatin structure.
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由 53BP1-RIF1 和 BRCA1-CtIP 组成的细胞周期依赖性调节回路控制 DNA 修复途径的选择。
DOI: 10.1016/j.molcel.2013.01.001
发表时间: 2013-03-07
期刊: MOLECULAR CELL
影响因子: 16
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