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Autosomal assignment of OTC in marsupials and monotremes: implications for the evolution of sex chromosomes

Published online by Cambridge University Press:  14 April 2009

Andrew H. Sinclair ,
Jacyln M. Wrigley  and
Jennifer A. Marshall Graves
Andrew H. Sinclair
Affiliation:
Department of Genetics and Human Variation La Trobe University, Bundoora, Victoria, 3083, Australia
Jacyln M. Wrigley
Affiliation:
Department of Genetics and Human Variation La Trobe University, Bundoora, Victoria, 3083, Australia
Jennifer A. Marshall Graves
Affiliation:
Department of Genetics and Human Variation La Trobe University, Bundoora, Victoria, 3083, Australia
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The OTC gene coding for ornithine transcarbamylase is sex linked and subject to X inactivation in humans and mice. We have used a rat cDNA probe to localize OTC by in situ hybridization in marsupials and monotremes. The gene maps to an autosomal site in two distantly related marsupial species and in one monotreme (the platypus); the first demonstration that a gene X-linked in one mammalian species may be autosomal in another. Since the conservation of the mammalian X is thought to be a consequence of its isolation by the inactivation mechanism, we propose that an autosomal or pseudoautosomal segment containing OTC has been recruited into the inactivated region of the X rather recently in eutherian evolution while it remained autosomal, or was translocated to an autosome, in metatherian and prototherian mammals.

Type
Research Article
Information
Genetics Research , Volume 50 , Issue 2 , October 1987 , pp. 131 - 136
Copyright
Copyright © Cambridge University Press 1987

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