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Science. 2019 Sep 6;365(6457):1045-1049. doi: 10.1126/science.aaw0542.

Rock-paper-scissors: Engineered population dynamics increase genetic stability.

Liao MJ1,2, Din MO2, Tsimring L2,3, Hasty J4,2,3,5.

Author information

1
Department of Bioengineering, University of California-San Diego, La Jolla, CA, USA.
2
BioCircuits Institute, University of California-San Diego, La Jolla, CA, USA.
3
San Diego Center for Systems Biology, University of California-San Diego, San Diego, CA, USA.
4
Department of Bioengineering, University of California-San Diego, La Jolla, CA, USA. hasty@ucsd.edu.
5
Molecular Biology Section, Division of Biological Science, University of California-San Diego, La Jolla, CA, USA.

Abstract

Advances in synthetic biology have led to an arsenal of proof-of-principle bacterial circuits that can be leveraged for applications ranging from therapeutics to bioproduction. A unifying challenge for most applications is the presence of selective pressures that lead to high mutation rates for engineered bacteria. A common strategy is to develop cloning technologies aimed at increasing the fixation time for deleterious mutations in single cells. We adopt a complementary approach that is guided by ecological interactions, whereby cyclical population control is engineered to stabilize the functionality of intracellular gene circuits. Three strains of Escherichia coli were designed such that each strain could kill or be killed by one of the other two strains. The resulting "rock-paper-scissors" dynamic demonstrates rapid cycling of strains in microfluidic devices and leads to an increase in the stability of gene circuit functionality in cell culture.

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PMID:
31488693
DOI:
10.1126/science.aaw0542

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