2018_SkinkSex.pdf (304.74 kB)
Download fileConservation of sex-linked markers among conspecific populations of a viviparous skink, Niveoscincus occllatus, exhibiting genetic and temperature-dependent sex determination
journal contribution
posted on 2023-05-19, 17:34 authored by Peta HillPeta Hill, Christopher BurridgeChristopher Burridge, Ezaz, T, Erik WapstraErik WapstraSex 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.
Funding
Australia and Pacific Science Foundation
History
Publication title
Genome Biology and EvolutionVolume
10Issue
4Pagination
1079-1087ISSN
1759-6653Department/School
School of Natural SciencesPublisher
Oxford University PressPlace of publication
United KingdomRights statement
Copyright 2018 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/Repository Status
- Open