Genetic evidence for co-occurrence of chromosomal and thermal sex-determining systems in a lizard

Radder, Rajkumar S., Quinn, Alexander E., Georges, Arthur, Sarre, Stephen D. and Shine, Richard (2008) Genetic evidence for co-occurrence of chromosomal and thermal sex-determining systems in a lizard. Biology Letters, 4 2: 176-178. doi:10.1098/rsbl.2007.0583


Author Radder, Rajkumar S.
Quinn, Alexander E.
Georges, Arthur
Sarre, Stephen D.
Shine, Richard
Title Genetic evidence for co-occurrence of chromosomal and thermal sex-determining systems in a lizard
Journal name Biology Letters   Check publisher's open access policy
ISSN 1744-9561
1744-957X
Publication date 2008-04-23
Sub-type Article (original research)
DOI 10.1098/rsbl.2007.0583
Open Access Status Not yet assessed
Volume 4
Issue 2
Start page 176
End page 178
Total pages 7
Place of publication London, United Kingdom
Publisher The Royal Society Publishing
Language eng
Formatted abstract
An individual's sex depends upon its genes (genotypic sex determination or GSD) in birds and mammals, but reptiles are more complex: some species have GSD whereas in others, nest temperatures determine offspring sex (temperature-dependent sex determination). Previous studies suggested that montane scincid lizards (Bassiana duperreyi, Scincidae) possess both of these systems simultaneously: offspring sex is determined by heteromorphic sex chromosomes (XX-XY system) in most natural nests, but sex ratio shifts suggest that temperatures override chromosomal sex in cool nests to generate phenotypically male offspring even from XX eggs. We now provide direct evidence that incubation temperatures can sex-reverse genotypically female offspring, using a DNA sex marker. Application of exogenous hormone to eggs also can sex-reverse offspring (oestradiol application produces XY as well as XX females). In conjunction with recent work on a distantly related lizard taxon, our study challenges the notion of a fundamental dichotomy between genetic and thermally determined sex determination, and hence the validity of current classification schemes for sex-determining systems in reptiles.
© 2007 The Royal Society.
Keyword Discordant sex
Reptile
Sex chromosomes
Temperature-dependent sex determination
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Institute for Molecular Bioscience - Publications
 
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Created: Sat, 12 Feb 2011, 01:42:30 EST by Susan Allen on behalf of Institute for Molecular Bioscience