Turnover of sex chromosomes in the Lake Tanganyika cichlid tribe Tropheini (Teleostei: Cichlidae).

0582836 - ÚBO 2025 RIV US eng J - Journal Article
Behrens, K. A. - Zimmermann, Holger - Blažek, Radim - Reichard, Martin - Koblmüller, S. - Kocher, T. D.
Turnover of sex chromosomes in the Lake Tanganyika cichlid tribe Tropheini (Teleostei: Cichlidae).
Scientific Reports. Roč. 14, č. 1 (2024), č. článku 2471. ISSN 2045-2322. E-ISSN 2045-2322
Institutional support: RVO:68081766
Keywords : Cichlids * Mitochondrial DNA * Molecular evolution * Lakes * Phylogeny * Sex Chromosomes * Tanzania
OECD category: Zoology
Impact factor: 4.6, year: 2022
Method of publishing: Open access
https://www.nature.com/articles/s41598-024-53021-3

Sex chromosome replacement is frequent in many vertebrate clades, including fish, frogs, and lizards. In order to understand the mechanisms responsible for sex chromosome turnover and the early stages of sex chromosome divergence, it is necessary to study lineages with recently evolved sex chromosomes. Here we examine sex chromosome evolution in a group of African cichlid fishes (tribe Tropheini) which began to diverge from one another less than 4 MYA. We have evidence for a previously unknown sex chromosome system, and preliminary indications of several additional systems not previously reported in this group. We find a high frequency of sex chromosome turnover and estimate a minimum of 14 turnovers in this tribe. We date the origin of the most common sex determining system in this tribe (XY-LG5/19) near the base of one of two major sub-clades of this tribe, about 3.4 MY ago. Finally, we observe variation in the size of one sex-determining region that suggests independent evolution of evolutionary strata in species with a shared sex-determination system. Our results illuminate the rapid rate of sex chromosome turnover in the tribe Tropheini and set the stage for further studies of the dynamics of sex chromosome evolution in this group.
Permanent Link: https://hdl.handle.net/11104/0350886