Novel sex chromosomes in three cichlid fishes from Lake Tanganyika

Publication Type:Journal Article
Year of Publication:2018
Authors:W. J. Gammerdinger, Conte, M. A. , Sandkam, B. A. , Ziegelbecker, A. , Koblmüller, S. , Kocher, T. D.
Journal:Journal of Heredity
Type of Article:epub 10-Feb-2018 ahead of print; open access
Keywords:color dimorphism, lake tanganyika cichlids, sex chromosome evolution

African cichlids are well known for their adaptive radiations, but it is now apparent that they also harbor an extraordinary diversity of sex chromosome systems. In this study, we sequenced pools of males and females from species in three different genera of cichlids from Lake Tanganyika. We then searched for regions that were differentiated following the patterns expected for sex chromosomes. We report two novel sex chromosomes systems, an XY system on LG19 in Tropheus sp. 'black' and a ZW system on LG7 in Hemibates stenosoma. We also identify a ZW system on LG5 in Cyprichromis leptosoma that may be convergent with a system previously described in Lake Malawi cichlids. Our data also identify candidate SNPs for the blue/yellow tail color polymorphism observed among male Cyprichromis leptosoma.

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