Jingwei Liu, Tingting Zhou, Xiang Dong, Qiqiang Guo, Lixia Zheng, Xiaoxun Wang, Naijin Zhang, Danni Li, Ling Ren, Fei Yi, Ying Zhang, Ziwei Li, Xiwen Wang, Chengsi Deng, Chunlu Li, Hongde Xu, Yi Guan, Xiaoman Li, Yang Yu, Wendong Guo, Zhuo Wang, Bo Jiang, Xuan Wu, Ning Bai, Yanling Feng, Mengtao Ma, Qingquan Kong, Jiayi Wei, Zhenshuang Wang, Hao Li, Songming Lu, Liangzi Cao, Yutong Xiao, Xiaoyu Song, Zhenning Wang, Chengzhong Xing, Liu Cao
Oncogenic stress induces DNA damage repair (DDR) that permits escape from mitotic catastrophe and allows early precursor lesions during the evolution of cancer. SAMHD1, a dNTPase protecting cells from viral infections, has been recently found to participate in DNA damage repair process. However, its role in tumorigenesis remains largely unknown. Here, we show that SAMHD1 is up-regulated in early-stage human carcinoma tissues and cell lines under oxidative stress or genotoxic insults. We further demonstrate that de-ubiquitinating enzyme USP7 interacts with SAMHD1 and de-ubiquitinates it at lysine 421, thus stabilizing SAMHD1 protein expression for further interaction with CtIP for DDR, which promotes tumor cell survival under genotoxic stress...
April 20, 2023: Oncogene