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Gene Pool and Population Genetics
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Rock-paper-scissors: Engineered population dynamics increase genetic stability.

Michael J Liao1,2, M Omar Din2, Lev Tsimring2,3

  • 1Department of Bioengineering, University of California-San Diego, La Jolla, CA, USA.

Science (New York, N.Y.)
|September 7, 2019
PubMed
Summary
This summary is machine-generated.

Engineered bacteria with synthetic gene circuits can be stabilized using ecological interactions. A "rock-paper-scissors" dynamic in Escherichia coli prevents mutations and enhances circuit stability for synthetic biology applications.

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Area of Science:

  • Synthetic biology
  • Microbial ecology
  • Genetic engineering

Background:

  • Synthetic biology enables bacterial circuits for therapeutics and bioproduction.
  • Engineered bacteria face selective pressures causing high mutation rates, challenging applications.
  • Current strategies focus on cloning technologies to slow deleterious mutations.

Purpose of the Study:

  • To develop a novel approach for stabilizing intracellular gene circuits in engineered bacteria.
  • To utilize ecological interactions for cyclical population control to enhance genetic stability.
  • To engineer bacterial strains exhibiting a predator-prey dynamic to maintain circuit function.

Main Methods:

  • Designed three strains of *Escherichia coli* with specific kill-or-be-killed interactions.
  • Implemented a cyclical population control strategy based on ecological principles.
  • Utilized microfluidic devices to observe strain dynamics and gene circuit stability.

Main Results:

  • Demonstrated a "rock-paper-scissors" dynamic among the engineered *E. coli* strains.
  • Observed rapid cycling of strains within microfluidic environments.
  • Showcased increased stability of intracellular gene circuit functionality in cell culture.

Conclusions:

  • Ecological interactions, specifically cyclical population control, offer a complementary strategy to stabilize synthetic gene circuits.
  • The engineered "rock-paper-scissors" system effectively manages bacterial populations and prevents deleterious mutations.
  • This approach enhances the reliability of engineered bacteria for synthetic biology applications.