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Related Experiment Videos

Starting to cycle: G1 controls regulating cell division in budding yeast

G Sherlock1, J Rosamond

  • 1Department of Biochemistry and Molecular Biology, University of Manchester, UK.

Journal of General Microbiology
|November 1, 1993
PubMed
Summary

This study proposes two models for how yeast cells commit to division after START, focusing on the regulation of cell cycle progression by the CDC28 kinase and G1 cyclins.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • START is a critical cell cycle checkpoint in Saccharomyces cerevisiae, regulated by the CDC28 gene product.
  • While CDC28 regulation at START is understood, downstream events leading to S phase are unclear.

Purpose of the Study:

  • To propose models for the regulation of events following p34CDC28 activation and progression to S phase.
  • To elucidate the roles of G1 cyclins and transcription factors in cell cycle commitment.

Main Methods:

  • Comparative analysis of gene regulation elements (SCB, MCB) for CDC4, SCM4, and HFS1.
  • Hypothesizing regulatory pathways involving transcription factors SBF and DSC1.
  • Proposing models based on known yeast cell cycle mechanisms.

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Main Results:

  • Two models are presented: one where p34CDC28/G1 cyclin kinase targets only SBF and DSC1, and another with multiple targets.
  • The first model suggests SBF/DSC1 regulate CDC4 function and genes for bud emergence/spindle pole body duplication.
  • The second model proposes functional redundancy among G1 cyclins (Cln3, Cln1, Cln2) for substrate specificity.

Conclusions:

  • The regulation of cell cycle progression post-START involves complex interactions between kinases, cyclins, and transcription factors.
  • Distinct G1 cyclin complexes may have specialized roles, with potential overlap and redundancy.
  • Further research is needed to fully characterize these regulatory pathways.