An ATR- and Cdc7-dependent DNA damage checkpoint that inhibits initiation of DNA replication.

  title={An ATR- and Cdc7-dependent DNA damage checkpoint that inhibits initiation of DNA replication.},
  author={Vincenzo Costanzo and David Shechter and Patrick J Lupardus and Karlene A Cimprich and Max Gottesman and J -C. Gautier},
  journal={Molecular cell},
  volume={11 1},
We have analyzed how single-strand DNA gaps affect DNA replication in Xenopus egg extracts. DNA lesions generated by etoposide, a DNA topoisomerase II inhibitor, or by exonuclease treatment activate a DNA damage checkpoint that blocks initiation of plasmid and chromosomal DNA replication. The checkpoint is abrogated by caffeine and requires ATR, but not ATM, protein kinase. The block to DNA synthesis is due to inhibition of Cdc7/Dbf4 protein kinase activity and the subsequent failure of Cdc45… CONTINUE READING
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