Mutagenesis Advance Access originally published online on November 28, 2005
Mutagenesis 2006 21(1):3-9; doi:10.1093/mutage/gei063
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DNA damage checkpoints in mammals
Department of Biochemistry and Cell Biology, Graduate School of Medical Sciences, Nagoya City University, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya 467-8601, Japan
DNA damage is a common event and probably leads to mutation or deletion within chromosomal DNA, which may cause cancer or premature aging. DNA damage induces several cellular responses including DNA repair, checkpoint activity and the triggering of apoptotic pathways. DNA damage checkpoints are associated with biochemical pathways that end delay or arrest of cell-cycle progression. These checkpoints engage damage sensor proteins, such as the Rad9-Rad1-Hus1 (9-1-1) complex, and the Rad17–RFC complex, in the detection of DNA damage and transduction of signals to ATM, ATR, Chk1 and Chk2 kinases. Chk1 and Chk2 kinases regulate Cdc25, Wee1 and p53 that ultimately inactivate cyclin-dependent kinases (Cdks) which inhibit cell-cycle progression. In this review, we discuss the molecular mechanisms by which DNA damage is recognized by sensor proteins and signals are transmitted to Cdks. We classify the genes involved in checkpoint signaling into four categories, namely sensors, mediators, transducers and effectors, although their proteins have the broad activity, and thus this classification is for convenience and is not definitive.
* To whom correspondence should be addressed. Tel: +81 52 853 8144; Fax: +81 52 842 3955; Email: mkt-naka{at}med.nagoya-cu.ac.jp
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