Reference: Tercero JA, et al. (2003) A central role for DNA replication forks in checkpoint activation and response. Mol Cell 11(5):1323-36

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Abstract


The checkpoint proteins Rad53 and Mec1-Ddc2 regulate many aspects of cell metabolism in response to DNA damage. We have examined the relative importance of downstream checkpoint effectors on cell viability. Checkpoint regulation of mitosis, gene expression, and late origin firing make only modest contributions to viability. By contrast, the checkpoint is essential for preventing irreversible breakdown of stalled replication forks. Moreover, recruitment of Ddc2 to nuclear foci and subsequent activation of the Rad53 kinase only occur during S phase and require the assembly of replication forks. Thus, DNA replication forks are both activators and primary effectors of the checkpoint pathway in S phase.

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Journal Article | Research Support, Non-U.S. Gov't
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Tercero JA, Longhese MP, Diffley JF
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