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XB-ART-4501
J Cell Biol 2003 Oct 27;1632:245-55. doi: 10.1083/jcb.200306006.
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DNA damage-induced replication arrest in Xenopus egg extracts.

Stokes MP , Michael WM .


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Chromosomal replication is sensitive to the presence of DNA-damaging alkylating agents, such as methyl methanesulfonate (MMS). MMS is known to inhibit replication though activation of the DNA damage checkpoint and through checkpoint-independent slowing of replication fork progression. Using Xenopus egg extracts, we now report an additional pathway that is stimulated by MMS-induced damage. We show that, upon incubation in egg extracts, MMS-treated DNA activates a diffusible inhibitor that blocks, in trans, chromosomal replication. The downstream effect of the inhibitor is a failure to recruit proliferating cell nuclear antigen, but not DNA polymerase alpha, to the nascent replication fork. Thus, alkylation damage activates an inhibitor that intercepts the replication pathway at a point between the polymerase alpha and proliferating cell nuclear antigen execution steps. We also show that activation of the inhibitor does not require the DNA damage checkpoint; rather, stimulation of the pathway described here results in checkpoint activation. These data describe a novel replication arrest pathway, and they also provide an example of how subpathways within the DNA damage response network are integrated to promote efficient cell cycle arrest in response to damaged DNA.

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Species referenced: Xenopus
Genes referenced: arhgef5 cdc45 chek1 ecd mcm7 mmut orc2 pcna pola1 rad17 slc19a1 tbx2


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References [+] :
Abraham, Cell cycle checkpoint signaling through the ATM and ATR kinases. 2001, Pubmed