Molecular Biology and Evolution, Vol 14, 49-55, Copyright © 1997 by Society for Molecular Biology and Evolution
P Pamilo and RJ O'Neill
Existing DNA sequence data on the Sry gene, the mammalian sex- determining
locus in the Y chromosome, were analyzed for primates, rodents, and bovids.
In all three taxonomic groups, the terminal sequences evolved faster than
the HMG (high mobility group) boxes, and this applies both to synonymous
(Ks) and nonsynonymous (Ka) nucleotide substitutions. Similar intragenic
correlation between synonymous and nonsynonymous substitution rates was not
found either in other mammalian genes that contain a conservative box (Sox,
Msx) or in the MADS-box genes of plants. The rate of nonsynonymous
substitutions exceeds significantly that of synonymous substitutions in the
terminal Sry sequences of apes. We did not find good support for the
hypothesis that the high evolutionary rate of Sry would be associated with
a promiscuous mating system.
ORIGINAL ARTICLE
Evolution of the Sry genes
Department of Genetics, University of Uppsala, Sweden. pekka.pamilo@genetik.uu.se
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