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Related Experiment Videos

Checkpoint responses to replication stalling: inducing tolerance and preventing mutagenesis.

Mihoko Kai1, Teresa S-F Wang

  • 1Department of Pathology, Stanford University School of Medicine, Stanford, CA 94305-5324, USA.

Mutation Research
|December 4, 2003
PubMed
Summary

Replication mutants can cause mutations, but fission yeast checkpoints up-regulate translesion polymerase DinB (Polkappa) to tolerate replication stress. Checkpoint proteins also regulate fork stability, preventing genomic instability and cancer.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Replication mutants often display a mutator phenotype, leading to point mutations and frameshifts.
  • Checkpoint proteins play a crucial role in modulating the mutator phenotype observed in replication mutants.
  • Understanding checkpoint responses to replication perturbations is vital for comprehending genomic stability.

Purpose of the Study:

  • To investigate checkpoint responses to replication perturbations in fission yeast.
  • To elucidate the role of checkpoint proteins in regulating translesion polymerases and replication fork stability.
  • To understand how cells tolerate replication stress and prevent genomic instability.

Main Methods:

  • Utilizing fission yeast (Schizosaccharomyces pombe) as a model system.

Related Experiment Videos

  • Analyzing the effects of DNA polymerase mutants on checkpoint activation and mitotic entry.
  • Investigating the recruitment of DinB (Polkappa) by the Rad9-Rad1-Hus1 (9-1-1) complex to chromatin.
  • Examining the regulation of Mus81-Eme1, Rqh1, and Rad60 by Cds1 kinase.

    • Main Results:

    • Checkpoint activation in DNA polymerase mutants up-regulates translesion polymerase DinB (Polkappa).
    • The Rad9-Rad1-Hus1 (9-1-1) complex recruits DinB to chromatin, generating point mutations and frameshifts.
    • Cds1 kinase regulates Mus81-Eme1, Rqh1, and Rad60 to maintain replication fork stability.
    • These checkpoint-regulated processes enable cells to survive replication perturbations.

    Conclusions:

    • A novel checkpoint-induced tolerance mechanism allows cells to cope with replication perturbation by restarting stalled forks.
    • Cds1-regulated proteins cooperatively prevent mutagenesis and maintain replication fork stability under replication stress.
    • Checkpoint-regulated processes prevent the degeneration of stalled replication forks, averting genomic instability and cancer development.