SETD2-mediated H3K14 Trimethylation Promotes ATR Activation and Stalled Replication Fork Restart in Response to DNA Replication Stress

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2021 Jun 2

PMID 34074749

Citations 13

Authors

Qian Zhu

Qiaoyan Yang

Xiaopeng Lu

Hui Wang

Lili Tong

Zheng Li

Ge Liu

Yantao Bao

Xingzhi Xu

Luo Gu

Jian Yuan

Xiangyu Liu

Wei-Guo Zhu

Affiliations

Soon will be listed here.

Abstract

Ataxia telangiectasia and Rad3 related (ATR) activation after replication stress involves a cascade of reactions, including replication protein A (RPA) complex loading onto single-stranded DNA and ATR activator loading onto chromatin. The contribution of histone modifications to ATR activation, however, is unclear. Here, we report that H3K14 trimethylation responds to replication stress by enhancing ATR activation. First, we confirmed that H3K14 monomethylation, dimethylation, and trimethylation all exist in mammalian cells, and that both SUV39H1 and SETD2 methyltransferases can catalyze H3K14 trimethylation in vivo and in vitro. Interestingly, SETD2-mediated H3K14 trimethylation markedly increases in response to replication stress induced with hydroxyurea, a replication stress inducer. Under these conditions, SETD2-mediated H3K14me3 recruited the RPA complex to chromatin via a direct interaction with RPA70. The increase in H3K14me3 levels was abolished, and RPA loading was attenuated when SETD2 was depleted or H3K14 was mutated. Rather, the cells were sensitive to replication stress such that the replication forks failed to restart, and cell-cycle progression was delayed. These findings help us understand how H3K14 trimethylation links replication stress with ATR activation.

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