hMSH5 Regulates NHEJ and Averts Excessive Nucleotide Alterations at Repair Joints.

hMSH5 Regulates NHEJ and Averts Excessive Nucleotide Alterations at Repair Joints.
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hMSH5调节NHEJ并避免修复关节处的过度核苷酸改变。

DOI:
10.3390/genes13040673
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发表时间:
2022-04-11
期刊:
影响因子:
3.5
通讯作者:
Her, Chengtao
Her, Chengtao
中科院分区:
生物学3区
文献类型:
--
作者:
Al-Soodani, Aneesa T.;Wu, Xiling;Kelp, Nicole C.;Brown, Alexander J.;Roberts, Steven A.;Her, Chengtao

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DNA双链断裂(DSB)修复不当会导致基因组不稳定、细胞死亡或恶性转化。细胞根据其潜在的细胞环境有选择地激活合适的DSB修复途径,从而将这些有害影响降至最低。在这里,我们报告了hMSH5下调NHEJ并限制重新连接前DSB末端加工的程度,从而减少了修复关节的“过度”缺失和插入。RNAi介导的hMSH5基因敲除导致修复关节处大的核苷酸缺失和更长的插入,同时减少修复关节处的平均微同源长度(MH)。相反,hMSH5过表达降低了末端连接活性,增加了RPA焦点的形成(即在DSB末端更稳定的单链DNA)。此外,沉默hMSH5延迟了53BP1染色质的扩散,导致DSB末端切除增加。
Inappropriate repair of DNA double-strand breaks (DSBs) leads to genomic instability, cell death, or malignant transformation. Cells minimize these detrimental effects by selectively activating suitable DSB repair pathways in accordance with their underlying cellular context. Here, we report that hMSH5 down-regulates NHEJ and restricts the extent of DSB end processing before rejoining, thereby reducing “excessive” deletions and insertions at repair joints. RNAi-mediated knockdown of hMSH5 led to large nucleotide deletions and longer insertions at the repair joints, while at the same time reducing the average length of microhomology (MH) at repair joints. Conversely, hMSH5 overexpression reduced end-joining activity and increased RPA foci formation (i.e., more stable ssDNA at DSB ends). Furthermore, silencing of hMSH5 delayed 53BP1 chromatin spreading, leading to increased end resection at DSB ends.
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