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The Cell Cycle Control System01:28

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The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
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Comprehensive Parameter Space Mapping of Cell Cycle Dynamics under Network Perturbations.

Zhengda Li1,2, Shiyuan Wang1, Meng Sun1

  • 1Department of Biophysics, University of Michigan, Ann Arbor, Michigan 48109, United States.

ACS Synthetic Biology
|February 29, 2024
PubMed
Summary

We developed a synthetic cell system to precisely tune biological parameters, enabling robust testing and refinement of quantitative models for complex systems like cell cycle regulation.

Keywords:
cell cycle oscillationdroplet microfluidicspositive feedback loopssynthetic cellstunability

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Area of Science:

  • Synthetic biology
  • Quantitative systems biology
  • Cell cycle regulation

Background:

  • Models are crucial in systems and synthetic biology but often lack validated parameters for complex biological systems.
  • Reliability of existing models in perturbed biological systems remains a challenge.

Purpose of the Study:

  • To develop an experimental framework for global parameter space scans in biological systems.
  • To systematically perturb a cell-cycle oscillator and map its dynamic responses.
  • To challenge and refine computational models using experimental data.

Main Methods:

  • Developed a droplet-based synthetic cell system for multi-dimensional parameter tuning at the single-cell level.
  • Systematically perturbed a cyclin-dependent kinase 1 (Cdk1)-centered cell-cycle oscillator.
  • Mapped the resulting period landscapes and cellular responses to perturbations.

Main Results:

  • Generated comprehensive data to challenge and refine existing computational models of the cell cycle.
  • Demonstrated that Cdk1 positive feedback inhibition restricts cell cycle frequency, validating model predictions.
  • Revealed novel cell cycle responses, including monomodal or bimodal distributions, to PP2A inhibition, explained by the refined model.

Conclusions:

  • The developed synthetic cell platform enables precise experimental control for exploring complex biological dynamics.
  • The study refined a model of cell cycle regulation, highlighting the role of Cdk1 feedback and PP2A inhibition.
  • The platform offers a generalizable approach for investigating other complex dynamic biological systems.