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Suppressing evolution in genetically engineered systems through repeated supplementation.

Nathan C Layman1, Beth M Tuschhoff2, Andrew J Basinski2

  • 1Department of Biological Sciences University of Idaho Moscow ID USA.

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Summary
This summary is machine-generated.

Supplementation can help maintain engineered genes in populations by introducing new genetic material. However, this method may not be practical for all applications, such as gene drives, due to population size challenges.

Keywords:
bioreactorgene drivegene flowgenetic engineeringswampingtransmissible vaccine

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Area of Science:

  • Genetics
  • Evolutionary Biology
  • Synthetic Biology

Background:

  • Genetically engineered organisms can evolve, potentially compromising their intended function.
  • Maintaining the stability of engineered genomes is crucial for the successful application of genetic engineering.
  • Gene flow, through supplementation, offers a potential strategy to counteract unwanted evolutionary changes.

Purpose of the Study:

  • To investigate the feasibility of supplementation as a method to prevent the evolutionary degradation of transgenes.
  • To assess the effectiveness of supplementation across three distinct model systems: a bioreactor, a gene drive, and a transmissible vaccine.

Main Methods:

  • Modeling the impact of continuous gene flow from a stock population to balance mutation and selection pressures.
  • Analyzing three distinct systems: a bioreactor, a gene drive, and a transmissible vaccine.
  • Calculating the required supplementation levels to maintain transgene frequency in a bioreactor system.

Main Results:

  • Supplementation is a viable strategy for maintaining transgenes in bioreactor systems, with required levels dependent on the selective disadvantage (s).
  • The transmissible vaccine model also shows feasibility for supplementation.
  • Supplementation is likely impractical for preventing resistance evolution in gene drive systems due to challenges in replacing even small fractions of large populations.

Conclusions:

  • Supplementation can be an effective tool for stabilizing engineered gene frequencies in certain contexts, like bioreactors and vaccines.
  • The practical implementation of supplementation is limited by population size and the feasibility of continuous genetic material replacement.
  • Further research may be needed to optimize supplementation strategies for complex systems like gene drives.