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- W2011684685 abstract "Cdc7-Dbf4 serine/threonine kinase is essential for initiation of DNA replication. It was previously found that overexpression of certain replication proteins such as Cdc6 and Cdt1 in fission yeast resulted in multiple rounds of DNA replication in the absence of mitosis. Since this phenomenon is dependent upon the presence of wild-type Cdc7/Hsk1, we hypothesized that high levels of Cdc7 and/or Dbf4 could also cause multiple rounds of DNA replication, or could facilitate entry into S phase. To test this hypothesis, we transiently overexpressed hamster Cdc7, Dbf4 or both in CHO cells. Direct observations of individual cells by fluorescence microscopy and flow cytometric analysis on cell populations suggest that overexpression of Cdc7 and/or Dbf4 does not result in multiple rounds of DNA replication or facilitating entry into S phase. In contrast, moderately increased levels of Dbf4, but not Cdc7, cause cell-cycle arrest in G2/M. This G2/M arrest coincides with hyperphosphorylation of Cdc2/Cdk1 at Tyr-15, raising the possibility that high levels of Dbf4 may activate a G2/M cell-cycle checkpoint. Further increase in Cdc7 and/or Dbf4 by 2–4 fold can arrest cells in G1 and significantly slow down S-phase progression for the cells already in S phase." @default.
- W2011684685 created "2016-06-24" @default.
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- W2011684685 date "2005-12-01" @default.
- W2011684685 modified "2023-10-09" @default.
- W2011684685 title "High levels of Cdc7 and Dbf4 proteins can arrest cell-cycle progression" @default.
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- W2011684685 doi "https://doi.org/10.1016/j.ejcb.2005.09.016" @default.
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