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Dynamics of sex chromosome evolution in a rapid radiation of cichlid fishes

AutorInnen: 
Athimed El Taher, Fabrizia Ronco, Michael Matschiner, Walter Salzburger, Astrid Böhne
Erscheinungsjahr: 
2021
Vollständiger Titel: 
Dynamics of sex chromosome evolution in a rapid radiation of cichlid fishes
ZFMK-Autorinnen / ZFMK-Autoren: 
Publiziert in: 
Science Advances
Publikationstyp: 
Zeitschriftenaufsatz
DOI Name: 
10.1126/sciadv.abe8215
Keywords: 
cichlid fishes, sex chromosomes, turnover, radiation
Bibliographische Angaben: 
El Taher A, Ronco F, Matschiner M, Salzburger W and Böhne A. Dynamics of sex chromosome evolution in a rapid radiation of cichlid fishes. Science Advances 7(36):eabe8215, doi: 10.1126/sciadv.abe8215.
Abstract: 

Sex is a fundamental trait determined by environmental and/or genetic factors, including sex chromosomes. Sex chromosomes are studied in species scattered across the tree of life, yet little is known about tempo and mode of sex chromosome evolution among closely related species. Here, we examine sex chromosome evolution in the adaptive radiation of cichlid fishes in Lake Tanganyika. Through the analysis of male and female genomes from 244 cichlid taxa (189 described species with 5 represented with two local variants/populations; 50 undescribed species) and of 396 multitissue transcriptomes from 66 taxa, we identify signatures of sex chromosomes in 79 taxa, involving 12 linkage groups. We find that Tanganyikan cichlids have the highest rates of sex chromosome turnover and heterogamety transitions known to date. We show that sex chromosome recruitment is not at random. Moreover convergently emerged sex chromosomes in cichlids support the “limited options” hypothesis of sex chromosome evolution.

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