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Noise Reduction in Resource-Coupled Multi-Module Gene Circuits through Antithetic Feedback Control.

Suchana Chakravarty1, Rong Zhang1, Xiao-Jun Tian1

  • 1School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ 85287, USA.

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|April 14, 2025
PubMed
Summary
This summary is machine-generated.

We developed new gene circuit control strategies to reduce gene expression noise caused by limited cellular resources. The negatively competitive regulation (NCR) controller effectively minimizes this noise, leading to more robust synthetic biology systems.

Keywords:
antithetic feedback controlgene circuitnoise reductionresource competition

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Area of Science:

  • Synthetic biology
  • Systems biology
  • Genetic engineering

Background:

  • Gene circuits in the same cell face resource competition, leading to transcriptional and translational coupling.
  • This coupling introduces noise into gene expression, impacting circuit reliability.
  • Understanding and mitigating resource-driven noise is crucial for designing robust synthetic gene circuits.

Purpose of the Study:

  • To develop and evaluate novel multi-module antithetic control strategies for reducing gene expression noise.
  • To specifically address noise arising from resource competition within host cells.
  • To compare the efficacy of different control strategies, including negatively competitive regulation (NCR), local, and global controllers.

Main Methods:

  • Stochastic simulations were employed to model gene circuit dynamics under resource constraints.
  • Fluctuation-dissipation theorem (FDT) analysis was used to quantify noise levels.
  • Three multi-module antithetic control strategies were designed and simulated.

Main Results:

  • The negatively competitive regulation (NCR) antithetic controller demonstrated superior performance in reducing gene expression noise compared to other strategies.
  • Resource competition was identified as a significant source of noise in coupled gene circuits.
  • The proposed control strategies effectively attenuated resource-driven noise.

Conclusions:

  • The NCR antithetic controller offers an effective solution for mitigating gene expression noise in resource-limited environments.
  • This research provides valuable insights for engineering more robust and predictable synthetic gene circuits.
  • The findings contribute to the advancement of synthetic biology by addressing a fundamental challenge in gene circuit design.