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

Dynamics of sex chromosome evolution in a rapid radiation of cichlid fishes.
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DOI:
10.1126/sciadv.abe8215
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发表时间:
2021-09-03
期刊:
影响因子:
13.6
通讯作者:
Böhne A
Böhne A
中科院分区:
综合性期刊1区
文献类型:
--
作者:
El Taher A;Ronco F;Matschiner M;Salzburger W;Böhne A

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We show that sex chromosome changes are very frequent in Lake Tanganyika cichlids and repeatedly involve the same chromosomes. 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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