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The rate of compensatory evolution

¹Department of Zoology, University of Maryland, College Park 20742-4415, USA. stephan@zool.umd.edu.

|September 1, 1996

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Compensatory mutations in RNA structures can arise even if intermediate steps are harmful. Recombination generally slows this evolutionary process, except under weak selection.

Area of Science:

Evolutionary Biology
Molecular Biology
Population Genetics

Background:

Compensatory mutations are crucial for the evolution of RNA secondary structures.
Single mutations can be deleterious, but combinations can be neutral or beneficial.
Evolutionary trajectories often involve navigating through fitness valleys.

Purpose of the Study:

To model the evolutionary dynamics of compensatory mutations in RNA stems.
To calculate the expected time for transitions between fitness peaks.
To define and analyze the rate of compensatory evolution (kappa c).

Main Methods:

Development of a two-locus population genetics model.
Application of diffusion theory to calculate transition times.

Related Experiment Videos

Analysis of the rate of compensatory evolution (kappa c) under varying selection and recombination.

Main Results:

The rate of compensatory evolution (kappa c) is independent of recombination (r) under strong selection.
Recombination generally decreases kappa c by disrupting favorable mutation combinations.
Under weak selection, kappa c becomes independent of recombination.

Conclusions:

Recombination's impact on compensatory evolution depends on selection strength.
The study provides insights into the substitution process of compensatory mutants in RNA secondary structures.
Results are discussed in the context of Wright's shifting balance theory.