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Studying Age-dependent Genomic Instability using the S. cerevisiae Chronological Lifespan Model
08:46

Studying Age-dependent Genomic Instability using the S. cerevisiae Chronological Lifespan Model

Published on: September 29, 2011

Compromised cellular responses to DNA damage accelerate chronological aging by incurring cell wall fragility in

Shanshan Yu1, Xian-En Zhang, Guanjun Chen

  • 1The State Key Laboratory of Microbial Technology, School of Life Science, Shandong University, No. 27 Shanda South Road, Jinan, 250100, Shandong, People's Republic of China.

Molecular Biology Reports
|June 30, 2011
PubMed

Insights

Cellular defense networks protect against DNA damage and aging. Defects in antioxidation, DNA repair, and checkpoints accelerate aging and increase mutation rates in yeast.

Area of Science:

  • Cellular Biology
  • Genetics
  • Aging Research

Background:

  • Reactive oxygen species (ROS) cause DNA damage, impacting cellular function.
  • Biological networks involving antioxidation, DNA repair, and checkpoints mitigate ROS effects.
  • Yeast chronological aging is influenced by cellular defense mechanisms.

Purpose of the Study:

  • To investigate the role of cellular defense networks in yeast chronological aging.
  • To assess the impact of mutations in antioxidation, DNA repair, and checkpoint pathways on aging.
  • To correlate DNA damage response defects with lifespan and cellular sensitivity.

Main Methods:

  • Utilized Saccharomyces cerevisiae (yeast) strains with targeted mutations.
  • Assessed mutation rates in wild-type versus mutant strains.
  • Determined chronological lifespan via colony formation assays.
  • Evaluated sensitivity to SDS and lysing enzymes.

Main Results:

  • Mutants deficient in antioxidation, DNA repair, and checkpoints exhibited higher mutation rates.
  • Chronological lifespan was reduced in most mutants, particularly those with DNA replication and checkpoint defects.
  • Mutant sensitivity to SDS and lysing enzymes correlated with reduced lifespan.

Conclusions:

  • Cellular antioxidation, DNA repair, and checkpoint pathways are crucial for longevity.
  • Defects in these networks compromise genomic stability and accelerate aging in yeast.
  • Yeast models provide insights into the fundamental mechanisms of aging and DNA damage response.

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