Equilibrium distributions of microsatellite repeat length resulting from a balance between slippage events and point mutations.

Abstract:

:We describe and test a Markov chain model of microsatellite evolution that can explain the different distributions of microsatellite lengths across different organisms and repeat motifs. Two key features of this model are the dependence of mutation rates on microsatellite length and a mutation process that includes both strand slippage and point mutation events. We compute the stationary distribution of allele lengths under this model and use it to fit DNA data for di-, tri-, and tetranucleotide repeats in humans, mice, fruit flies, and yeast. The best fit results lead to slippage rate estimates that are highest in mice, followed by humans, then yeast, and then fruit flies. Within each organism, the estimates are highest in di-, then tri-, and then tetranucleotide repeats. Our estimates are consistent with experimentally determined mutation rates from other studies. The results suggest that the different length distributions among organisms and repeat motifs can be explained by a simple difference in slippage rates and that selective constraints on length need not be imposed.

authors

Kruglyak S,Durrett RT,Schug MD,Aquadro CF

doi

10.1073/pnas.95.18.10774

subject

Has Abstract

pub_date

1998-09-01 00:00:00

pages

10774-8

issue

18

eissn

0027-8424

issn

1091-6490

journal_volume

95

pub_type

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