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- Title
Conservation of Sex-Linked Markers among Conspecific Populations of a Viviparous Skink, Niveoscincus ocellatus, Exhibiting Genetic and Temperature-Dependent Sex Determination.
- Authors
Hill, Peta L.; Burridge, Christopher P.; Ezaz, Tariq; Wapstra, Erik
- Abstract
Sex determination systems are exceptionally diverse and have undergonemultiple and independent evolutionary transitions among species, particularly reptiles. However, themechanisms underlying these transitions have not been established. Here, wetested for differences in sex-linkedmarkers 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 consistentwithmale heterogamety (XY). However, population-specific linkage disequilibriumsuggests 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.
- Subjects
GENETIC sex determination; BIOLOGICAL tags; SKINKS; LOCUS (Genetics); ANIMAL offspring sex ratio; TEMPERATURE-dependent sex determination
- Publication
Genome Biology & Evolution, 2018, Vol 10, Issue 4, p1079
- ISSN
1759-6653
- Publication type
Article
- DOI
10.1093/gbe/evy042