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An Evolutionary Perspective on Yeast Mating-Type Switching.

Sara J Hanson1,2,3, Kenneth H Wolfe4,2

  • 1Conway Institute, University College Dublin, Dublin 4, Ireland.

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|May 7, 2017
PubMed
Summary
This summary is machine-generated.

Yeast mating-type switching, a DNA rearrangement process, differs between Saccharomyces cerevisiae and Schizosaccharomyces pombe. This review explores the evolution and regulation of this key cell differentiation mechanism.

Keywords:
evolutionhomothallismmating-type switchingsporulationyeast genetics

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Area of Science:

  • Molecular Biology
  • Yeast Genetics
  • Evolutionary Biology

Background:

  • Cell differentiation in yeast is regulated by mating-type switching, a programmed DNA rearrangement.
  • This process involves replacing an active mating-type locus with a copy from a silent locus.
  • Distinct molecular mechanisms govern mating-type switching in budding yeast (Saccharomyces cerevisiae) and fission yeast (Schizosaccharomyces pombe).

Purpose of the Study:

  • To review and compare the function and evolution of mating-type switching components in yeast species.
  • To explore key questions regarding the regulation, molecular apparatus, origin, and evolutionary purpose of mating-type switching.
  • To provide insights into heterochromatin formation, MAT locus cleavage, donor bias, lineage tracking, and environmental regulation.

Main Methods:

  • Comparative review of existing literature on mating-type switching in various yeast species.
  • Analysis of mechanisms including heterochromatin formation and MAT locus cleavage.
  • Examination of regulatory factors such as donor bias, lineage tracking, and environmental influences.

Main Results:

  • Mating-type switching relies on DNA cleavage and synthesis-dependent strand annealing, with species-specific regulatory components.
  • Mechanisms of heterochromatin formation, MAT locus cleavage, donor bias, lineage tracking, and environmental regulation are key to switching.
  • Comparisons highlight similarities and differences in switching processes across Saccharomyces cerevisiae, Schizosaccharomyces pombe, Kluyveromyces lactis, and methylotrophic yeasts.

Conclusions:

  • Mating-type switching is a conserved yet distinct DNA-rearrangement process crucial for yeast cell differentiation.
  • Understanding the molecular apparatus and evolutionary purpose of switching provides insights into yeast biology.
  • Further research is needed to fully elucidate the evolutionary trajectory and functional significance of mating-type switching.