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Nat Cell Biol. 2006 Jan;8(1):37-45. Epub 2005 Dec 4.

ATM- and cell cycle-dependent regulation of ATR in response to DNA double-strand breaks.

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  • 1The Wellcome Trust and Cancer Research UK Gurdon Institute, and Department of Zoology, Cambridge University, Tennis Court Road, Cambridge, CB2 1QN, UK.


It is generally thought that the DNA-damage checkpoint kinases, ataxia-telangiectasia mutated (ATM) and ATM- and Rad3-related (ATR), work independently of one another. Here, we show that ATM and the nuclease activity of meiotic recombination 11 (Mre11) are required for the processing of DNA double-strand breaks (DSBs) to generate the replication protein A (RPA)-coated ssDNA that is needed for ATR recruitment and the subsequent phosphorylation and activation of Chk1. Moreover, we show that efficient ATM-dependent ATR activation in response to DSBs is restricted to the S and G2 cell cycle phases and requires CDK kinase activity. Thus, in response to DSBs, ATR activation is regulated by ATM in a cell-cycle dependent manner.

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