Molecular Biology and Evolution, Vol 14, 926-933, Copyright © 1997 by Society for Molecular Biology and Evolution
LA Zhivotovsky, MW Feldman and SA Grishechkin
Mutation bias is one of the forces that may constrain the variation at
microsatellite loci. Here, we study the dynamics of population statistics
and the genetic distance between two populations under multiple stepwise
mutations with linear bias and random drift. Expressions are derived for
these statistics as functions of time, as well as at mutation-drift
equilibrium. Applying these expressions to published data on humans and
chimpanzees, the regression coefficient of mutation bias on allele size was
estimated to be at least between - 0.0064 and -0.013. The assumption of
mutational bias produces larger estimates of divergence times than are
obtained in its absence; in particular, the time of split between African
and non-African human populations is estimated to be between 183,000 and
222,000 years, assuming one-step mutations and no selection. With multistep
mutations, the divergence time is estimated to be lower.
ORIGINAL ARTICLE
Biased mutations and microsatellite variation
Vavilov Institute of General Genetics, Russian Academy of Sciences, Moscow, Russia.
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