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Manipulation and Analysis of Cell Cycle-Dependent Processes in Budding Yeast
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The budding yeast life cycle: More complex than anticipated?

Gilles Fischer1, Gianni Liti2, Bertrand Llorente3

  • 1CNRS, Institut de Biologie Paris-Seine, Laboratory of Computational and Quantitative Biology, Sorbonne Université, Paris, France.

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|November 16, 2020
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Summary
This summary is machine-generated.

The budding yeast, Saccharomyces cerevisiae, maintains high heterozygosity and polyploidy despite its life cycle favoring inbreeding. Uncharted factors like mating type switching and cell fusion may explain this paradox.

Keywords:
saccharomyces

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Area of Science:

  • * Microbiology and Eukaryotic Cell Biology
  • * Population Genomics and Evolutionary Biology

Background:

  • * Saccharomyces cerevisiae (budding yeast) is a model organism for studying eukaryotic life cycles.
  • * Its canonical life cycle involves alternating haploid and diploid phases, promoting inbreeding and genome homozygosity.
  • * Recent genomic data reveal unexpected commonality of heterozygosity and polyploidy in yeast populations.

Purpose of the Study:

  • * To investigate the paradox of high heterozygosity and polyploidy in Saccharomyces cerevisiae, a species adapted to inbreeding.
  • * To explore potential uncharted mechanisms contributing to heterozygosity and polyploidy.

Main Methods:

  • * Analysis of large population genomics data.
  • * Theoretical proposal of contributing factors to yeast life cycle complexity.

Main Results:

  • * High levels of heterozygosity and polyploidy are unexpectedly prevalent in Saccharomyces cerevisiae populations.
  • * The canonical life cycle does not fully explain these observations.

Conclusions:

  • * Factors beyond canonical inbreeding, such as mating type switching, heterothallism, reduced spore viability, cell-cell fusion, and dioecy, may significantly contribute to generating and maintaining heterozygosity through polyploidization.
  • * The life cycle of Saccharomyces cerevisiae is more complex than previously understood, involving uncharted pathways for genetic variation.