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Molecular Biology and Evolution, Vol 16, 1763-1773, Copyright © 1999 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

The origin of a Robertsonian chromosomal translocation in house mice inferred from linked microsatellite markers

C Riginos and MW Nachman
Department of Ecology and Evolutionary Biology, University of Arizona, Tucson 85721, USA. riginos@u.arizona.edu

The western European house mouse, Mus domesticus, includes many distinct Robertsonian (Rb) chromosomal races. Two competing hypotheses may explain the distribution of Rb translocations found in different populations: they may have arisen independently multiple times, or they may have arisen once and been spread through long-distance dispersal. We investigated the origin of the Rb 5.15 translocation using six microsatellite loci linked to the centromeres of chromosomes 5 and 15 in 84 individuals from three Rb populations and four neighboring standard-karyotype populations. Microsatellite variation on the 5.15 metacentric chromosomes was significantly reduced relative to the amount of variation found on acrocentric chromosomes 5 and 15, suggesting that linked microsatellite loci can track specific mutational events. Phylogenetic analyses resulted in trees which are consistent with multiple origins of the 5.15 metacentric chromosomes found in the three Rb populations. These results suggest that cytologically indistinguishable mutations have arisen independently in natural populations of house mice.
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