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Mitotic checkpoint function in the formation of gross chromosomal rearrangements in Saccharomyces cerevisiae

Kyungjae Myung1, Stephanie Smith, Richard D Kolodner

  • 1National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20892, USA.

Proceedings of the National Academy of Sciences of the United States of America
|October 30, 2004
PubMed

Insights

Defects in mitotic checkpoints can suppress gross chromosomal rearrangements (GCRs), suggesting these checkpoints play a role in genome instability, a hallmark of cancer.

Area of Science:

  • Genetics
  • Molecular Biology
  • Cell Biology

Background:

  • Gross chromosomal rearrangements (GCRs) are hallmarks of cancer.
  • While pathways preventing GCRs are known, those promoting GCRs are less understood.
  • De novo telomere addition and nonhomologous end-joining are key GCR-promoting pathways.

Purpose of the Study:

  • To investigate the role of mitotic checkpoints in the formation of GCRs.
  • To identify pathways that influence the rate of genome rearrangements.

Main Methods:

  • Utilized Saccharomyces cerevisiae (yeast) as a model organism.
  • Created strains with defects known to increase GCR rates.
  • Assessed the impact of mitotic checkpoint and mitotic exit network defects on GCR rates.

Main Results:

  • Defects in the mitotic checkpoint suppressed GCRs in strains with pre-existing GCR-inducing defects.
  • Defects in the mitotic exit network also suppressed GCRs.
  • These findings indicate a role for functional checkpoints in promoting genome instability.

Conclusions:

  • Functional mitotic checkpoints can contribute to the formation of genome rearrangements.
  • Mitotic integrity pathways are implicated in maintaining genome stability.
  • Understanding GCR-promoting pathways is crucial for cancer research.

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