Synergy between SIRT1 and SIRT6 helps recognize DNA breaks and potentiates the DNA damage response and repair in humans and mice
oleh: Fanbiao Meng, Minxian Qian, Bin Peng, Linyuan Peng, Xiaohui Wang, Kang Zheng, Zuojun Liu, Xiaolong Tang, Shuju Zhang, Shimin Sun, Xinyue Cao, Qiuxiang Pang, Bosheng Zhao, Wenbin Ma, Zhou Songyang, Bo Xu, Wei-Guo Zhu, Xingzhi Xu, Baohua Liu
| Format: | Article |
|---|---|
| Diterbitkan: | eLife Sciences Publications Ltd 2020-06-01 |
Deskripsi
The DNA damage response (DDR) is a highly orchestrated process but how double-strand DNA breaks (DSBs) are initially recognized is unclear. Here, we show that polymerized SIRT6 deacetylase recognizes DSBs and potentiates the DDR in human and mouse cells. First, SIRT1 deacetylates SIRT6 at residue K33, which is important for SIRT6 polymerization and mobilization toward DSBs. Then, K33-deacetylated SIRT6 anchors to γH2AX, allowing its retention on and subsequent remodeling of local chromatin. We show that a K33R mutation that mimics hypoacetylated SIRT6 can rescue defective DNA repair as a result of SIRT1 deficiency in cultured cells. These data highlight the synergistic action between SIRTs in the spatiotemporal regulation of the DDR and DNA repair in humans and mice.