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Related Experiment Videos

DNA damage checkpoints are involved in postreplication repair.

Leslie Barbour1, Lindsay G Ball, Ke Zhang

  • 1Department of Microbiology and Immunology, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E5, Canada.

Genetics
|October 24, 2006
PubMed
Summary

DNA repair pathways in yeast are complex. Researchers identified RAD9 as a novel gene involved in postreplication repair (PRR), highlighting its crucial role in DNA damage tolerance.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Saccharomyces cerevisiae MMS2 is part of the error-free postreplication repair (PRR) pathway, acting parallel to the REV3-mediated mutagenesis branch.
  • Mutations in either the MMS2 or REV3 branches alone do not cause extreme DNA damage sensitivity, but combined deletions show synergistic effects.

Purpose of the Study:

  • To identify novel genes involved in the PRR pathway using a synthetic lethal screen with DNA-damaging agents.
  • To elucidate the role of RAD9 within the PRR pathway and its interaction with other PRR components.

Main Methods:

  • Synthetic lethal screen in the presence of methyl methanesulfonate (MMS) to identify novel PRR genes.
  • Epistatic analysis to determine the genetic interactions between rad9, mms2, rev3, and rad18 mutants.

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  • Assessment of DNA damage-induced and spontaneous mutagenesis.

    • Main Results:

    • RAD9 was identified as a novel PRR gene, showing synergistic interactions with both mms2 and rev3 mutants.
    • The rad9 mutant exhibited reduced damage-induced mutagenesis, and mms2 mutagenesis was partially dependent on RAD9.
    • Synergistic interactions were observed between PRR branches and checkpoint genes, indicating their interconnectedness.

    Conclusions:

    • RAD9 plays a significant role within the PRR pathway, contributing to DNA damage tolerance.
    • A functional DNA damage checkpoint is essential for tolerance mediated by both error-free and error-prone PRR branches.