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Cell cycle control by a minimal Cdk network.

Claude Gérard1, John J Tyson2, Damien Coudreuse3

  • 1Oxford Centre for Integrative Systems Biology, Department of Biochemistry, University of Oxford, Oxford, United Kingdom.

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Summary
This summary is machine-generated.

A simplified cell cycle in fission yeast, using a single cyclin-Cdk fusion protein, surprisingly mimics wild-type behavior. Mathematical modeling revealed why removing inhibitory phosphorylation is harmless in these minimal systems.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Systems Biology

Background:

  • Eukaryotic cell cycle control involves complex protein networks, including cyclins, cyclin-dependent kinases (Cdks), and the Anaphase Promoting Complex (APC).
  • Precise temporal regulation of these proteins is crucial for successful cell cycle progression.
  • Fission yeast with a minimal Cdk network (single cyclin-Cdk fusion) exhibits wild-type DNA synthesis and mitosis, a surprising observation given the complexity in other eukaryotes.

Purpose of the Study:

  • To understand the cell cycle regulatory network in fission yeast with a minimal Cdk system.
  • To build and analyze a mathematical model of molecular interactions controlling G1/S and G2/M transitions in these minimal cells.
  • To explain the benign effect of eliminating inhibitory Cdk phosphorylation and the broad cell size distribution at division in these strains.

Main Methods:

  • Development of a mathematical model simulating molecular interactions in minimal fission yeast cell cycle.
  • Analysis of the model to account for observed properties of yeast strains with a fusion protein.
  • Experimental analysis of alternative minimal cells coupled with model predictions.
  • Stochastic simulations to analyze cell size distribution at division.

Main Results:

  • The mathematical model successfully replicated all observed properties of yeast strains with the fusion protein.
  • An explanation was found for why eliminating inhibitory Cdk phosphorylation is benign in minimal strains but detrimental in normal cells.
  • Stochastic simulations accounted for the unusually broad distribution of cell size at division in the strain lacking inhibitory phosphorylation.
  • A new mechanistic model for mitotic catastrophe was proposed, based on unregulated, multi-cyclin-dependent Cdk activities.

Conclusions:

  • The study provides novel insights into the organization and quantitative regulation of cell cycle progression.
  • The minimal Cdk network in fission yeast demonstrates a robust yet simplified regulatory mechanism.
  • The findings challenge existing paradigms by showing functional cell division with reduced regulatory complexity.
  • A new model for mitotic catastrophe offers a potential explanation for failures in cell cycle regulation under specific conditions.