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

journal contribution
posted on 2023-05-20, 22:29 authored by Peta HillPeta Hill, Shams, F, Christopher BurridgeChristopher Burridge, Erik WapstraErik Wapstra, Ezaz, T
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.

History

Publication title

Cells

Volume

10

Article number

291

Number

291

Pagination

1-17

ISSN

2073-4409

Department/School

School of Natural Sciences

Publisher

Molecular Diversity Preservation International

Place of publication

Switzerland

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the biological sciences

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