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Updated: Jun 7, 2025

Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli
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Phenotype selection due to mutational robustness.

Macoto Kikuchi1

  • 1Cybermedia Center, Osaka University, Toyonaka, Japan.

Plos One
|November 18, 2024
PubMed
Summary
This summary is machine-generated.

Evolutionary selection favors phenotypes with higher mutational robustness. Gene regulatory networks (GRNs) with one-way switches were suppressed due to their lack of robustness, unlike those with core motifs favored by evolution.

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Area of Science:

  • Evolutionary biology
  • Systems biology
  • Genetics

Background:

  • Darwinian evolution balances adaptation with robustness against mutations.
  • Phenotype fitness can be equal, leading to varied robustness and potential selection bias.
  • Understanding selection bias for mutational robustness is crucial in evolutionary studies.

Purpose of the Study:

  • Investigate selection bias for phenotypes in gene regulatory networks (GRNs).
  • Examine how mutational robustness influences the evolutionary selection of GRN phenotypes.
  • Identify structural differences between robust and non-robust GRNs.

Main Methods:

  • Numerical simulations of GRN models with one input and one output gene.
  • Defined fitness based on output response to external signals.
  • Employed multicanonical Monte Carlo (McMC) method for random GRN generation.
  • Compared McMC-generated GRNs with outcomes of evolutionary simulations.

Main Results:

  • One-way switch phenotypes were suppressed during evolution due to low mutational robustness.
  • Mutationally robust GRNs evolved distinct network structures compared to non-robust GRNs.
  • Robust GRNs featured a common core motif, absent in non-robust GRNs.
  • Bistability in non-robust GRNs was attributed to cooperative gene interactions, which were evolutionarily suppressed.

Conclusions:

  • Mutational robustness acts as a significant selection bias in the evolution of GRN phenotypes.
  • Evolution favors GRN structures with inherent mutational robustness, exemplified by core motifs.
  • Cooperative gene interactions leading to bistability in non-robust GRNs are disfavored by evolutionary selection.