hMSH5 Regulates NHEJ and Averts Excessive Nucleotide Alterations at Repair Joints.
hMSH5 Regulates NHEJ and Averts Excessive Nucleotide Alterations at Repair Joints.
复制标题
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
中科院分区:
文献类型:
--
作者:
Al-Soodani, Aneesa T.;Wu, Xiling;Kelp, Nicole C.;Brown, Alexander J.;Roberts, Steven A.;Her, Chengtao
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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