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Journal of Heredity 2004:95(4):338-345
© 2004 The American Genetic Association

Brief Communication

Marsupial MHC Class II ß Genes Are Not Orthologous to the Eutherian ß Gene Families

K. Belov, M. K.-P. Lam, and D. J. Colgan

From the Evolutionary Biology Unit, Australian Museum, 6 College St., Sydney, NSW 2010, Australia (Belov and Colgan); and Department of Biological Sciences, Macquarie University, NSW 2109, Australia (Belov and Lam).

Address correspondence to Katherine Belov at the address above, or e-mail: kathyb{at}austmus.gov.au.

The major histocompatibility complex (MHC) class II DRB, DQB, DPB, and DOB gene clusters are shared by different eutherian orders. Such an orthologous relationship is not seen between the ß genes of birds and eutherians. A high degree of uncertainty surrounds the evolutionary relationship of marsupial class II ß sequences with eutherian ß gene families. In particular, it has been suggested that marsupials utilize the DRB gene cluster. A cDNA encoding an MHC class II ß molecule was isolated from a brushtail possum mesenteric lymph node cDNA library. This clone is most similar to Macropus rufogriseus DBB. Our analysis suggests that all known marsupial ß-chain genes, excluding DMB, fall into two separate clades, which are distinct from the eutherian DRB, DQB, DPB, or DOB gene clusters. We recommend that the DAB and DBB nomenclature be reinstated. DAB and DBB orthologs are not present in eutherians. It appears that the marsupial and eutherian lineages have retained different gene clusters following gene duplication events early in mammalian evolution.


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