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A Dynamical Framework for the All-or-None G1/S Transition.

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  • 1Division of Cancer Biology, Institute of Cancer Research, 237 Fulham Road, London SW3 6JB, UK.

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A double-negative feedback loop involving Cdk2:Cyclin and p27(Kip1) drives cell cycle entry into S phase. Increasing Emi1 levels maintain this transition

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Area of Science:

  • Cell Biology
  • Biophysics
  • Systems Biology

Background:

  • Cell cycle progression relies on complex interactions between cyclins, cyclin-dependent kinases (Cdks), and Cdk inhibitors (CKIs).
  • The transition into DNA replication (S phase) is a critical decision point regulated by these molecular players.
  • Understanding the quantitative dynamics of G1/S phase transition is essential for deciphering cell cycle control.

Purpose of the Study:

  • To quantitatively describe the molecular interactions governing the G1/S phase transition.
  • To elucidate the role of feedback loops in cell cycle commitment.
  • To investigate the contribution of Emi1 to the irreversibility of the G1/S transition.

Main Methods:

  • Quantitative imaging of single human cells to track G1/S regulator expression.
  • Development and parameterization of a stochastic mathematical model for the G1/S transition.
  • Experimental validation using Emi1 knockdown and live imaging of G1/S reporters.

Main Results:

  • A rapid, proteolytic, double-negative feedback loop between Cdk2:Cyclin and p27(Kip1) was identified as the driver of switch-like entry into S phase.
  • The model predicted that sustained Emi1 levels are crucial for maintaining the irreversibility of the G1/S transition.
  • Experimental validation confirmed the model's predictions regarding Emi1 function.

Conclusions:

  • The G1/S phase transition is governed by a switch-like mechanism driven by specific feedback loops.
  • Emi1 plays a critical role in ensuring the irreversibility of cell cycle commitment to S phase.
  • This study provides insights into the design principles of signaling networks controlling abrupt cell-cycle phase transitions.