Studies on metatherian sex chromosomes. XII. Sex-linked inheritance and probable paternal X-inactivation of a-galactosidase A in Australian marsupials.

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Abstract
An investigation of genetic variation in the electrophoretic mobility of the enzyme .alpha.-galactosidase A (EC 3.2.1.22) was carried out for 33 spp. of Australian metatherian (marsupial) mammals. The results are compatible with the enzyme being sex-linked in macropodids (kangaroos and wallabies) and probably in dasyurids (marsupial mice, etc.), as it is in eutherian (placental) mammals. The mode of dosage compensation for this locus may be the same as for other sex-linked loci in kangaroos, i.e, paternal X inactivation, rather than the random X inactivation system of eutherian mammals. The bearing of the enzyme mobility data on phylogenetic relationships among macropodid species is discussed.

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