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BY4741 cannot enter quiescence from rich medium.

Shawna Miles1, Cameron Lee2, Linda Breeden1

  • 1Basic Science, Fred Hutchinson Cancer Center, Seattle, Washington, United States.

Micropublication Biology
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Summary
This summary is machine-generated.

Different yeast strains exhibit distinct glucose metabolism and cell cycle arrest behaviors. W303 yeast show synchronized G1 arrest tied to glucose depletion, unlike BY4741 yeast which arrest earlier and less uniformly.

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Area of Science:

  • Cell Biology
  • Microbiology
  • Biochemistry

Background:

  • * Saccharomyces cerevisiae* is a model organism for studying cell cycle regulation and nutrient sensing.
  • * Glucose availability is a primary driver of yeast growth and proliferation.
  • * Quiescence is a reversible cell cycle arrest state crucial for survival under nutrient limitation.

Purpose of the Study:

  • * To compare the cell cycle progression and quiescence entry of two *Saccharomyces cerevisiae* strains (W303 and BY4741) in rich medium.
  • * To investigate the relationship between glucose availability, biomass accumulation, and cell cycle arrest.
  • * To determine if BY4741 exhibits stereotypical quiescence entry mechanisms observed in other strains.

Main Methods:

  • * Culturing *Saccharomyces cerevisiae* strains W303 and BY4741 in rich medium.
  • * Monitoring cell density and cell cycle phase distribution over time.
  • * Measuring glucose concentration and correlating it with cell division and arrest points.

Main Results:

  • * W303 cells entered G1 arrest approximately one hour before glucose exhaustion, after one asymmetrical cell division.
  • * BY4741 cells arrested cell division four hours before glucose exhaustion at a significantly lower cell density.
  • * BY4741 cells did not undergo asymmetrical division, and only 50% arrested in G1, suggesting non-glucose-limited growth.

Conclusions:

  • * Yeast strain BY4741's growth is not solely limited by glucose and it deviates from typical quiescence entry pathways.
  • * In W303, glucose limitation and quiescence entry are closely linked to biomass accumulation rate and cell doubling time.
  • * Strain-specific differences in *Saccharomyces cerevisiae* dictate responses to nutrient availability and cell cycle regulation.