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Summary

Populations can evolve increased evolvability, even without direct selection for it. A benign mutational neighborhood arises as a byproduct of transiently elevated error rates, a process termed emergent evolutionary capacitance.

Keywords:
drift barrierevolutionary capacitorevolvabilitygene expressionmolecular errorsrobustness

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Area of Science:

  • Evolutionary biology
  • Genetics

Background:

  • Evolvability, the capacity of biological populations to evolve, is shaped by various forces.
  • The mutational neighborhood, or the set of possible mutations a genotype can undergo, is a key determinant of evolvability.
  • A benign mutational neighborhood, where mutations are less likely to be deleterious, can enhance evolvability.

Purpose of the Study:

  • To investigate whether selection for evolvability can lead to a more benign mutational neighborhood.
  • To explore the mechanisms underlying the evolution of increased evolvability in fluctuating environments.

Main Methods:

  • The study employed a regime designed to preclude the adaptive evolution of evolvability.
  • Researchers documented the evolution of increased evolvability in a fluctuating environment.
  • A mechanism termed emergent evolutionary capacitance was identified.

Main Results:

  • Increased evolvability was observed in the studied populations.
  • A benign mutational neighborhood emerged as a byproduct, not through direct selection for evolvability.
  • This occurred via transiently elevated error rates, a phenomenon termed emergent evolutionary capacitance.

Conclusions:

  • Emergent evolutionary capacitance can enhance evolvability without direct selection for it.
  • This mechanism provides a benign mutational neighborhood as a byproduct of transiently elevated error rates.
  • The findings offer new insights into the evolution of evolvability and its underlying mechanisms.