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Related Experiment Videos

An age-induced switch to a hyper-recombinational state.

Michael A McMurray1, Daniel E Gottschling

  • 1Division of Basic Sciences, The Fred Hutchinson Cancer Research Center, and Molecular and Cellular Biology Program, University of Washington, Seattle, WA 98109, USA.

Science (New York, N.Y.)
|September 27, 2003
PubMed
Summary
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As yeast cells age, genomic instability increases significantly, indicated by a 100-fold rise in loss of heterozygosity (LOH). This age-related genomic instability appears independent of lifespan extension, suggesting inherent nuclear genome instability with aging.

Area of Science:

  • Genetics
  • Cell Biology
  • Gerontology

Background:

  • A strong correlation exists between aging and cancer development.
  • The underlying mechanisms linking aging to cancer, particularly genomic instability, remain largely unknown.
  • Understanding age-related genomic instability is crucial for cancer research.

Purpose of the Study:

  • To investigate genomic instability as a hallmark of cancer in relation to cellular aging.
  • To examine the relationship between aging and loss of heterozygosity (LOH) in Saccharomyces cerevisiae.

Main Methods:

  • Utilized diploid yeast mother cells (Saccharomyces cerevisiae) to model cellular aging.
  • Quantified loss of heterozygosity (LOH) as a measure of genomic instability.
  • Compared LOH frequency and mechanisms in young versus aged cells.

Related Experiment Videos

  • Assessed the impact of lifespan extension on age-induced LOH.

    • Main Results:

    • A significant, approximately 100-fold increase in LOH was observed in aging diploid yeast mother cells.
    • The onset and frequency of age-induced LOH were not affected by lifespan extension, suggesting an independent aging clock.
    • LOH mechanisms shifted from reciprocal recombination in young cells to nonreciprocal recombination in aged cells, predominantly in progeny.

    Conclusions:

    • Genomic instability, specifically LOH, increases substantially with cellular age in yeast.
    • Age-induced LOH appears to follow a distinct biological clock, unaffected by interventions that extend lifespan.
    • The findings suggest that nuclear genomes may possess inherent instability that manifests with increasing age.