Journal
JOURNAL OF HEREDITY
Volume 108, Issue 1, Pages 94-105Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/jhered/esw053
Keywords
comparative gene mapping; sex chromosome evolution; sex determination
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Funding
- Australian Research Council [FT110100733]
- Faculty of Science and the Fellowship of Capacity Building for Kasetsart University on Internationalization, Kasetsart University, Thailand
- Australian Research Council [FT110100733] Funding Source: Australian Research Council
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The diversity of sex chromosomes among amniotes is the product of independent evolution of different systems in different lineages, defined by novel sex-determining genes. Convergent evolution is very common, suggesting that some genes are particularly adept at taking on a sex-determining role. Comparative gene mapping, and more recently whole genome sequencing, have now turned up other surprising relationships; different regions of the amniote genome that have become sex determining in some taxa seem to share synteny, or share sequence, in others. Is this, after all, evidence that these regions were once linked in a super-sex chromosome that underwent multiple fission in different ways in different amniote lineages? Or does it signify that special properties of sex chromosomes (paucity of active genes, low recombination, epigenetic regulation to achieve dosage compensation) predispose particular chromosomes to a sex-determining role?
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