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Aging in Saccharomyces cerevisiae

D Sinclair1, K Mills, L Guarente

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge 02139, USA. davids@mit.edu

Annual Review of Microbiology
|January 19, 1999
PubMed
Summary
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Yeast aging is genetically controlled and linked to cell division limits. The accumulation of circular rDNA molecules contributes to aging, unifying previous observations on yeast longevity.

Area of Science:

  • Cell biology
  • Genetics
  • Aging research

Background:

  • Budding yeast Saccharomyces cerevisiae exhibits asymmetric cell division, producing mother and daughter cells.
  • Mother cells have a finite lifespan, with aging characterized by slower cell cycles and sterility.
  • Yeast lifespan is strain-specific, indicating a significant genetic influence on aging.

Purpose of the Study:

  • To investigate the genetic factors influencing yeast longevity.
  • To understand the molecular mechanisms underlying yeast aging.
  • To unify disparate observations on yeast senescence.

Main Methods:

  • Genetic analysis of yeast strains with varying lifespans.
  • Monitoring cell cycle progression and reproductive capacity over time.

Related Experiment Videos

  • Investigating the role of cAMP metabolism, epigenetic silencing, and genome stability.
  • Analyzing the accumulation of circular rDNA molecules.

    • Main Results:

    • Identified genes affecting yeast longevity, implicating cAMP metabolism, epigenetic silencing, and genome stability.
    • Demonstrated that the accumulation of circular rDNA molecules is a key factor in yeast aging.
    • Connected previously unrelated aging mechanisms through the role of rDNA.

    Conclusions:

    • Yeast aging is a complex process with a strong genetic basis.
    • Circular rDNA molecule accumulation is a significant contributor to yeast senescence.
    • This finding provides a unifying framework for understanding yeast longevity.