To investigate the evolutionary dynamics at Mhc class II DR genes of mice (genus Mus), we sequenced the peptide binding regions (PBRs) of 41 DRB (=Eβ) genes and eight DRA (=Eα) genes from 15 strains representing eight species. As expected trees of these PBR sequences imply extensive maintenance of ancestral DRB alleles across species. We use of coalescent simulation model to show that the number of interspecific coalescent events (c) observed on these trees was higher than the number expected for neutral genealogies and similar sample sizes and is more consistent with balancing selection than with neutrality. Patterns of ancestral polymorphism in mouse DRB alleles were also used to examine the tempo of synonymous substitution in the PBR of mouse class II genes. Both absolute and relative rate tests on DRA and DRB genes imply increased substitution rates at two- and fourfold degenerate sites of mice and rats relative to primates, and decreased rats for the DRB genes of primates relative to ungulate and carnivore relatives. Thus rates of synonymous substitution at Mhr DR genes in mammals appear to be subject to generation time effects in ways similar to those found at other mammalian genes.
|Original language||English (US)|
|Number of pages||14|
|State||Published - Jun 1 1997|
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