Abstract
Sex determination in the endemic Australian lizard Bassiana duperreyi (Scincidae) is influenced by sex chromosomes and incubation temperature, challenging the traditional dichotomy in reptilian sex determination. Analysis of those interactions requires sex chromosome markers to identify temperature-induced sex reversal. Here, we report the isolation of Y chromosome DNA sequence from B. duperreyi using amplified fragment length polymorphism PCR, the conversion of that sequence to a single-locus assay, and its combination with a single-copy nuclear gene (C-mos) to form a duplex PCR test for chromosomal sex. The accuracy of the assay was tested on an independent panel of individuals with known phenotypic sex. When used on offspring from field nests, our test identified the likely occurrence of a low rate of natural sex reversal in this species. This work represents the first report of Y chromosome sequence from a reptile and one of the few reptile sex tests.
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Acknowledgments
We thank Melanie Elphick and Jacqui Richardson for laboratory assistance, and the Australian Research Council (DP0346850 to SDS and AG, DP0449935 to JM Graves, SDS and AG, and FF561365 to RS) for funding. We are deeply indebted to our late colleague Raju Radder who died unexpectedly at the age of 34 before this manuscript was finalized.
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Communicated by T. Becker.
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Quinn, A.E., Radder, R.S., Sarre, S.D. et al. Isolation and development of a molecular sex marker for Bassiana duperreyi, a lizard with XX/XY sex chromosomes and temperature-induced sex reversal. Mol Genet Genomics 281, 665–672 (2009). https://doi.org/10.1007/s00438-009-0437-7
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DOI: https://doi.org/10.1007/s00438-009-0437-7