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Conservation of sex-linked markers among conspecific populations of a viviparous skink, Niveoscincus occllatus, exhibiting genetic and temperature-dependent sex determination

Citation

Hill, PL and Burridge, CP and Ezaz, T and Wapstra, E, Conservation of sex-linked markers among conspecific populations of a viviparous skink, Niveoscincus occllatus, exhibiting genetic and temperature-dependent sex determination, Genome Biology and Evolution, 10, (4) pp. 1079-1087. ISSN 1759-6653 (2018) [Refereed Article]


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Copyright 2018 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1093/gbe/evy042

Abstract

Sex determination systems are exceptionally diverse and have undergone multiple and independent evolutionary transitions among species, particularly reptiles. However, the mechanisms underlying these transitions have not been established. Here, we tested for differences in sex-linked markers in the only known reptile that is polymorphic for sex determination system, the spotted snow skink, Niveoscincus ocellatus, to quantify the genomic differences that have accompanied this transition. In a highland population, sex is determined genetically, whereas in a lowland population, offspring sex ratio is influenced by temperature. We found a similar number of sex-linked loci in each population, including shared loci, with genotypes consistent with male heterogamety (XY). However, population-specific linkage disequilibrium suggests greater differentiation of sex chromosomes in the highland population. Our results suggest that transitions between sex determination systems can be facilitated by subtle genetic differences.

Item Details

Item Type:Refereed Article
Keywords:sex determination, GSD, TSD, heterogamety, population divergence, sex chromosomes, reptiles
Research Division:Biological Sciences
Research Group:Evolutionary Biology
Research Field:Evolutionary Impacts of Climate Change
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Hill, PL (Ms Peta Hill)
Author:Burridge, CP (Dr Christopher Burridge)
Author:Wapstra, E (Associate Professor Erik Wapstra)
ID Code:125507
Year Published:2018
Deposited By:Zoology
Deposited On:2018-04-20
Last Modified:2018-05-07
Downloads:22 View Download Statistics

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