Molecular clock in neutral protein evolution

BMC Genetics
Claus O Wilke

Abstract

A frequent observation in molecular evolution is that amino-acid substitution rates show an index of dispersion (that is, ratio of variance to mean) substantially larger than one. This observation has been termed the overdispersed molecular clock. On the basis of in silico protein-evolution experiments, Bastolla and coworkers recently proposed an explanation for this observation: Proteins drift in neutral space, and can temporarily get trapped in regions of substantially reduced neutrality. In these regions, substitution rates are suppressed, which results in an overall substitution process that is not Poissonian. However, the simulation method of Bastolla et al. is representative only for cases in which the product of mutation rate micro and population size Ne is small. How the substitution process behaves when micro Ne is large is not known. Here, I study the behavior of the molecular clock in in silico protein evolution as a function of mutation rate and population size. I find that the index of dispersion decays with increasing micro Ne, and approaches 1 for large micro Ne. This observation can be explained with the selective pressure for mutational robustness, which is effective when micro Ne is large. This pressure keeps ...Continue Reading

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Methods Mentioned

BETA
protein-folding
protein folding

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