Mutator Dynamics on a Smooth Evolutionary Landscape

Details Mutator Dynamics on a Smooth Evolutionary Landscape Mutator Dynamics on a Smooth Evolutionary Landscape

1997-11-02

arxiv.org/abs/patt-sol/9711001v1

Nonlinear Sciences

Pattern Formation and Solitons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.80.2012

We investigate a model of evolutionary dynamics on a smooth landscape which features a ``mutator'' allele whose effect is to increase the mutation rate. We show that the expected proportion of mutators far from equilibrium, when the fitness is steadily increasing in time, is governed solely by the transition rates into and out of the mutator state. This results is a much faster rate of fitness increase than would be the case without the mutator allele. Near the fitness equilibrium, however, the mutators are severely suppressed, due to the detrimental effects of a large mutation rate near the fitness maximum. We discuss the results of a recent experiment on natural selection of E. coli in the light of our model.

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