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Area of Science:

  • Synthetic biology
  • Systems biology
  • Biophysics

Background:

  • Resource competition is known to affect deterministic synthetic gene circuit behavior.
  • Its impact on gene expression noise, however, remains poorly understood.

Purpose of the Study:

  • To systematically analyze how resource competition influences noise propagation in a genetic inhibition cascade circuit.
  • To elucidate the mechanisms behind noise amplification in synthetic gene networks.

Main Methods:

  • Theoretical analysis of a genetic inhibition cascade circuit.
  • Modeling of gene expression noise under resource competition.

Main Results:

  • Resource competition amplifies gene expression noise.
  • It induces unexpected bistability and stochastic switching between expression states.
  • This leads to a "winner-takes-all" gene expression behavior.

Conclusions:

  • Resource competition plays a critical role in shaping noise dynamics and propagation in synthetic gene circuits.
  • Emergent bistability due to resource competition is a key factor in noise amplification.
  • These findings are important for the design and control of synthetic biological systems.