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Cell-cycle checkpoints. Keeping mitosis in check

T Humphrey1, T Enoch

  • 1Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA.

Current Biology : CB
|April 1, 1995
PubMed
Summary
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Mutations in yeast DNA polymerase epsilon disrupt the link between DNA replication and mitosis. This suggests the replication complex itself signals cell cycle progression.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Cell cycle progression relies on checkpoints to ensure DNA replication completion before mitosis.
  • DNA polymerase epsilon is crucial for DNA replication.

Purpose of the Study:

  • To investigate the role of DNA polymerase epsilon in the DNA replication checkpoint.

Main Methods:

  • Yeast genetics
  • Mitotic analysis
  • DNA replication assays

Main Results:

  • Mutations in the essential yeast gene for DNA polymerase epsilon were created.
  • These mutations abolished the dependence of mitosis on DNA replication completion.

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Conclusions:

  • The replication complex, specifically DNA polymerase epsilon, likely provides the checkpoint signal for mitosis.
  • This finding offers new insights into cell cycle regulation and DNA replication.