Tip60: Connecting Chromatin to DNA Damage Signaling

Overview

Journal Cell Cycle

Specialty Cell Biology

Date 2010 Feb 18

PMID 20160506

Citations 106

Authors

Yingli Sun

Xiaofeng Jiang

Brendan D Price

Affiliations

Soon will be listed here.

Abstract

Cells are constantly exposed to genotoxic events that can damage DNA. To counter this, cells have evolved a series of highly conserved DNA repair pathways to maintain genomic integrity. The ATM protein kinase is a master regulator of the DNA double-strand break (DSB) repair pathway. DSBs activate ATM's kinase activity, promoting the phosphorylation of proteins involved in both checkpoint activation and DNA repair. Recent work has revealed that two DNA damage response proteins, the Tip60 acetyltransferase and the mre11- rad50-nbs1 (MRN) complex, co-operate in the activation of ATM in response to DSBs. MRN functions to target ATM and the Tip60 acetyltransferase to DSBs. Tip60's chromodomain then interacts with histone H3 trimethylated on lysine 9, activating Tip60's acetyltransferase activity and stimulating the subsequent acetylation and activation of ATM's kinase activity. These results underscore the importance of chromatin structure in regulating DNA damage signaling and emphasize how histone modifications co-ordinate DNA repair. In addition, human tumors frequently exhibit altered patterns of histone methylation. This rewriting of the histone methylation code in tumor cells may impact the efficiency of DSB repair, increasing genomic instability and contributing to the initiation and progression of cancer.

Citing Articles

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NBS1 lactylation is required for efficient DNA repair and chemotherapy resistance.

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