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Differences in homomorphic sex chromosomes are associated with population divergence in sex determination in Carinascincus ocellatus (Scincidae: Lygosominae)

Citation

Hill, P and Shams, F and Burridge, CP and Wapstra, E and Ezaz, T, Differences in homomorphic sex chromosomes are associated with population divergence in sex determination in Carinascincus ocellatus (Scincidae: Lygosominae), Cells, 10, (2) Article 291. ISSN 2073-4409 (2021) [Refereed Article]

DOI: doi:10.3390/cells10020291

Abstract

Sex determination directs development as male or female in sexually reproducing organisms. Evolutionary transitions in sex determination have occurred frequently, suggesting simple mechanisms behind the transitions, yet their detail remains elusive. Here we explore the links between mechanisms of transitions in sex determination and sex chromosome evolution at both recent and deeper temporal scales (<1 Myr; ∼79 Myr). We studied a rare example of a species with intraspecific variation in sex determination, Carinascincus ocellatus, and a relative, Liopholis whitii, using c-banding and mapping of repeat motifs and a custom Y chromosome probe set to identify the sex chromosomes. We identified both unique and conserved regions of the Y chromosome among C. ocellatus populations differing in sex determination. There was no evidence for homology of sex chromosomes between C. ocellatus and L. whitii, suggesting independent evolutionary origins. We discuss sex chromosome homology between members of the subfamily Lygosominae and propose links between sex chromosome evolution, sex determination transitions, and karyotype evolution.

Item Details

Item Type:Refereed Article
Keywords:cryptic sex chromosomes, karyotype, GSD, TSD, Niveoscincus
Research Division:Biological Sciences
Research Group:Evolutionary biology
Research Field:Evolutionary ecology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biological sciences
UTAS Author:Hill, P (Ms Peta Hill)
UTAS Author:Burridge, CP (Associate Professor Christopher Burridge)
UTAS Author:Wapstra, E (Associate Professor Erik Wapstra)
ID Code:143750
Year Published:2021
Web of Science® Times Cited:1
Deposited By:Zoology
Deposited On:2021-03-31
Last Modified:2021-03-31
Downloads:0

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