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Antagonistic coevolution accelerates molecular evolution.

Steve Paterson1, Tom Vogwill, Angus Buckling

  • 1School of Biological Sciences, Biosciences Building, University of Liverpool, Crown Street, Liverpool L69 7ZB, UK.

Nature
|February 26, 2010
PubMed
Summary
This summary is machine-generated.

Antagonistic coevolution between species, like hosts and parasites, accelerates molecular evolution. This study empirically demonstrates that coevolving phage evolved faster and showed greater genetic divergence than those with constant hosts.

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Area of Science:

  • Evolutionary biology
  • Microbial genomics
  • Coevolutionary dynamics

Background:

  • The Red Queen hypothesis posits that species must continually adapt and counter-adapt to survive.
  • Empirical evidence for the Red Queen hypothesis has been limited due to the long timescales required for coevolutionary studies.

Purpose of the Study:

  • To empirically test the Red Queen hypothesis by examining molecular evolution rates in coevolving host-parasite systems.
  • To investigate the impact of antagonistic coevolution on the rate and pattern of molecular evolution in a bacterial-phage system.

Main Methods:

  • Experimental evolution using populations of Pseudomonas fluorescens SBW25 and its phage Phi2.
  • Comparing molecular evolution rates of phage evolving with a coevolving host versus a constant host genotype.
  • Analyzing genetic divergence and host infection range of evolved phage populations.

Main Results:

  • Phage molecular evolution rates were significantly higher when coevolving with the bacterium compared to evolving against a constant host.
  • Coevolution led to greater genetic divergence between replicate phage populations.
  • The extent of genetic divergence correlated with the range of hosts the coevolved phage could infect.
  • Genes involved in host infection showed the most rapid evolution under coevolutionary pressure.

Conclusions:

  • Antagonistic coevolution is a significant driver of rapid and divergent molecular evolution at both genomic and phenotypic levels.
  • This study provides direct empirical support for the Red Queen hypothesis in a microbial system.
  • Coevolutionary dynamics are crucial for understanding evolutionary change within species.