Genetics, Vol 146, 1019-1034, Copyright © 1997


INVESTIGATIONS

Discordant Phylogeographic Patterns Between the Y Chromosome and Mitochondrial DNA in the House Mouse: Selection on the Y Chromosome?

S. Boissinot and P. Boursot
Laboratoire Genome et Populations (CNRS UPR 9060), Universite Montpellier II, F-34095 Montpellier, France

We have compared patterns of geographic variation and molecular divergence of mitochondrial DNA (mtDNA) and Y chromosome over the range of the different subspecies of Mus musculus. MtDNA was typed for 305 nucleotides in the control region, the Y chromosome for 834 base pairs (bp) in Zfy introns and 242 bp in Sry, a Zfy2 18-bp deletion, and two microsatellites. Apparent discrepancies exist between the distributions of the lineages of mtDNA and of the two major Y-chromosome lineages thus defined: some subspecies share the same mtDNA lineage but have different Y-chromosome lineages or vice versa. One microsatellite reveals a geographically clustered variation inside the distribution of each Y-chromosome lineage, showing that new Y-chromosome variants can rapidly spread locally. The two major Y-chromosome lineages have a divergence time only about one fourth of that between mtDNA lineages. Although this recent coalescence of the Y chromosomes between subspecies could partly be due to a lower ancestral polymorphism of the Y chromosome, it suggests that secondary introgression after the radiation of the subspecies might have occurred. There is evidence that the differentiation of the Y-chromosome lineages contributes to partial reproductive isolation between subspecies, and patterns of molecular evolution suggest that selection has played a role in the rapid spread across subspecies.


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