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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

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Hill, PL, Burridge, CP ORCID: 0000-0002-8185-6091, Ezaz, T and Wapstra, E ORCID: 0000-0002-2050-8026 2018 , '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, vol. 10, no. 4 , pp. 1079-1087 , doi: 10.1093/gbe/evy042.

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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 Type: Article
Authors/Creators:Hill, PL and Burridge, CP and Ezaz, T and Wapstra, E
Keywords: sex determination, GSD, TSD, heterogamety, population divergence, sex chromosomes, reptiles
Journal or Publication Title: Genome Biology and Evolution
Publisher: Oxford University Press
ISSN: 1759-6653
DOI / ID Number: 10.1093/gbe/evy042
Copyright Information:

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

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