Transitions Between Sex-Determining Systems in Reptiles and Amphibians

Stephen Sarre, Tariq Ezaz, Arthur Georges

Research output: Contribution to journalArticlepeer-review

116 Citations (Scopus)


Important technological advances in genomics are driving a new understanding of the evolution of sex determination in vertebrates. In particular, comparative chromosome mapping in reptiles has shown an intriguing distribution of homology in sex chromosomes across reptile groups. When this new understanding is combined with the widespread distribution of genetic and temperature-dependent sex-determination mechanisms among reptiles, it is apparent that transitions between modes have occurred many times, as they have for amphibians (particularly between male and female heterogamety). It is also likely that thermosensitivity in sex determination is a key factor in those transitions in reptiles, and possibly in amphibians too. New models of sex determination involving temperature thresholds are providing the framework for the investigation of transitions and making possible key predictions about the homologies and sex-determination patterns expected among taxa in these groups. Molecular cytogenetics and other genomic approaches are essential to providing the fundamental material necessary to make advances in this field.
Original languageEnglish
Pages (from-to)391-406
Number of pages16
JournalAnnual Review of Genomics and Human Genetics
Publication statusPublished - 2011


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