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Related Experiment Videos

Compensatory evolution of interacting gene products through multifunctional intermediates.

Eric S Haag1, Michael N Molla

  • 1Department of Biology, University of Maryland, College Park 20742, USA. ehaag@umd.edu

Evolution; International Journal of Organic Evolution
|December 7, 2005
PubMed
Summary

Compensatory evolution, where mutations become beneficial together, drives genetic incompatibilities. New models with neutral intermediates show this process is more significant than previously thought, especially in small populations.

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Area of Science:

  • Evolutionary biology
  • Population genetics

Background:

  • Compensatory evolution occurs when mutations are deleterious alone but beneficial together, contributing to genetic incompatibilities.
  • Previous models (two locus/two allele) indicated compensatory evolution requires strict conditions like tight linkage or rapid mutation, and is generally very slow.

Purpose of the Study:

  • To explore novel two locus/three allele models incorporating neutral intermediates to better understand compensatory evolution.
  • To investigate how these intermediates influence the evolution of genetic incompatibilities between populations.

Main Methods:

  • Analytical and computer simulation methods were used to explore the models.
  • The models included neutral intermediates interacting with ancestral and compensated alleles.

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Main Results:

  • Neutral intermediates can profoundly impact the evolution of incompatibilities, differentiating between evolution and stasis in various scenarios.
  • In small populations or without positive selection, these intermediates facilitate incompatibility evolution.
  • In large populations, intermediates can either accelerate or decelerate incompatibility evolution depending on the fitness model.

Conclusions:

  • The evolution of intergenic incompatibility is influenced by population size, the nature of adaptive benefit, and the structure of gene product complexes.
  • Neutral intermediates offer a more plausible and potentially faster route for compensatory evolution and the development of genetic incompatibilities.