Autosomal assignment of OTC in marsupials and monotremes: implications for the evolution of sex chromosomes
- 1 August 1987
- journal article
- research article
- Published by Hindawi Limited in Genetics Research
- Vol. 50 (2), 131-136
- https://doi.org/10.1017/s0016672300023533
Abstract
Summary: 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.This publication has 23 references indexed in Scilit:
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