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Cell Polarity in Yeast.

Jian-Geng Chiou1, Mohan K Balasubramanian2, Daniel J Lew1

  • 1Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, North Carolina 27710;

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PubMed
Summary
This summary is machine-generated.

Cell polarity is regulated by Cdc42 GTPase machinery. Budding and fission yeasts share a core circuit but have adaptations for their lifestyles, controlling polarity site timing and location.

Keywords:
Cdc42GAPGEFcell polaritypositive feedbackyeast

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Cell polarity is crucial for cellular functions.
  • The Cdc42 GTPase is a conserved regulator of cell polarity across organisms.
  • Understanding yeast polarity provides insights into fundamental biological processes.

Purpose of the Study:

  • To review conserved and divergent mechanisms of cell polarity regulation in budding and fission yeasts.
  • To highlight the role of Cdc42 GTPase in establishing and maintaining cell polarity.
  • To explore how yeast species adapt polarity pathways to their specific lifestyles.

Main Methods:

  • Literature review of studies on yeast cell polarity.
  • Comparative analysis of molecular pathways in budding and fission yeasts.
  • Focus on the Cdc42 GTPase and its regulatory network.

Main Results:

  • A conserved core polarity circuit involving positive feedback and local activation of Cdc42 was identified.
  • Yeast species exhibit distinct adaptations in cell cycle timing, location, and number of polarity sites.
  • The GTP-bound form of Cdc42 (GTP-Cdc42) concentrates at the membrane, forming a polarity cluster.

Conclusions:

  • The Cdc42 GTPase pathway is a fundamental determinant of cell polarity.
  • Yeast employ both conserved core mechanisms and species-specific adaptations for polarity control.
  • These findings advance our understanding of how organisms establish cellular organization.