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Philosophical Transactions of the Royal Society B: Biological Sciences logoLink to Philosophical Transactions of the Royal Society B: Biological Sciences
. 2004 Jan 29;359(1441):31–38. doi: 10.1098/rstb.2003.1362

Mechanisms involved in regulating DNA replication origins during the cell cycle and in response to DNA damage.

Anne Early 1, Lucy S Drury 1, John F X Diffley 1
PMCID: PMC1693309  PMID: 15065654

Abstract

Replication origins in eukaryotic cells never fire more than once in a given S phase. Here, we summarize the role of cyclin-dependent kinases in limiting DNA replication origin usage to once per cell cycle in the budding yeast Saccharomyces cerevisiae. We have examined the role of different cyclins in the phosphorylation and regulation of several replication/regulatory factors including Cdc6, Sic1, ORC and DNA polymerase alpha-primase. In addition to being regulated by the cell cycle machinery, replication origins are also regulated by the genome integrity checkpoint kinases, Mec1 and Rad53. In response to DNA damage or drugs which interfere with the progression of replication forks, the activation of late-firing replication origins is inhibited. There is evidence indicating that the temporal programme of origin firing depends upon the local histone acetylation state. We have attempted to test the possibility that checkpoint regulation of late-origin firing operates through the regulation of the acetylation state. We found that overexpression of the essential histone acetylase, Esal, cannot override checkpoint regulation of origin firing. We have also constructed a temperature-sensitive esa1 mutant. This mutant is unable to resume cell cycle progression after alpha-factor arrest. This can be overcome by overexpression of the G1 cyclin, Cln2, revealing a novel role for Esal in regulating Start.

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Selected References

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