Molecular Biology and Evolution, Vol 15, 1744-1750, Copyright © 1998 by Society for Molecular Biology and Evolution
MW Nachman
DNA sequences from the nonrecombining portion of the Y chromosome were
compared with autosomal and X-linked sequences from mice and humans to test
the neutral prediction that ratios of polymorphism to divergence are the
same for different genes. Intraspecific variation within Mus domesticus was
compared with divergence between M. domesticus and Mus caroli for Sry, a
region 5' to Sry, and four X-linked genes, Hprt, Plp, Amg, and Glra2. None
of these comparisons revealed significantly reduced variation on the Y
chromosome. Intraspecific variation within humans was compared with
divergence between humans and chimpanzees for three Y-linked loci (Zfy, the
YAP region, and the Sry region), seven X- linked loci (Il2rg, Plp, Hprt,
Gk, Ids, Pdhal, and Dmd), and the beta- globin locus on chromosome 11. In
these comparisons, the observed level of variation on the human Y
chromosome was slightly lower than expected, but was significantly lower in
only one case (Sry region vs. Dmd). These results suggest that the levels
of variability on the Y chromosome in mice and humans are close to expected
values given the effective population size and mutation rates for these
loci. There is at most only a modest reduction in variability that may be
attributed to natural selection (either genetic hitchhiking or background
selection).
ORIGINAL ARTICLE
Y chromosome variation of mice and men
Department of Ecology and Evolutionary Biology, University of Arizona, Tucson 85721, USA. Nachman@u.arizona.edu
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