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.
journal_name
Genome Biol Evoljournal_title
Genome biology and evolutionauthors
Hill PL,Burridge CP,Ezaz T,Wapstra Edoi
10.1093/gbe/evy042subject
Has Abstractpub_date
2018-04-01 00:00:00pages
1079-1087issue
4issn
1759-6653pii
4920863journal_volume
10pub_type
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