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Suppression of spontaneous chromosomal rearrangements by S phase checkpoint functions in Saccharomyces cerevisiae

K Myung1, A Datta, R D Kolodner

  • 1Ludwig Institute for Cancer Research, Cancer Center and Department of Medicine, University of California-San Diego School of Medicine, La Jolla, CA 92093, USA.

Cell
|March 10, 2001
PubMed

Insights

Defects in S phase checkpoint genes significantly increase genome rearrangement rates in yeast, primarily causing deletions and telomere additions. These findings highlight the role of cell cycle checkpoints in preventing DNA replication errors and maintaining genome stability.

Area of Science:

  • Genetics
  • Molecular Biology
  • Cell Biology

Background:

  • Cancer cells exhibit elevated rates of genome rearrangements.
  • The underlying genetic defects causing these rearrangements are not fully understood.

Purpose of the Study:

  • To investigate the role of specific genes in Saccharomyces cerevisiae in causing genome rearrangements.
  • To elucidate the mechanisms by which DNA replication errors lead to genomic instability.

Main Methods:

  • Utilized Saccharomyces cerevisiae as a model organism.
  • Introduced mutations in various genes involved in DNA replication and cell cycle checkpoints.
  • Quantified the rate of genome rearrangements, including deletions and translocations.

Main Results:

  • Mutations in RFC5, DPB11, MEC1, DDC2, MEC3, RAD53, CHK1, PDS1, and DUN1 increased genome rearrangement rates up to 200-fold.
  • Mutations in RAD9, RAD17, RAD24, BUB3, and MAD3 had minimal effect on rearrangement rates.
  • Rearrangements primarily involved chromosome arm deletions with TEL1-dependent telomere additions.
  • tel1 mutations increased translocations and showed synergistic effects with other mutations.

Conclusions:

  • S phase checkpoint functions are crucial for suppressing spontaneous genome rearrangements arising from DNA replication errors.
  • Specific genes within the S phase checkpoint pathway play a critical role in maintaining genome stability.
  • Understanding these mechanisms can provide insights into cancer development and genomic instability.

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