Genomic consequences of domestication of the Siamese fighting fish

Author:

Kwon Young Mi123ORCID,Vranken Nathan45ORCID,Hoge Carla13ORCID,Lichak Madison R.12,Norovich Amy L.12ORCID,Francis Kerel X.12ORCID,Camacho-Garcia Julia4ORCID,Bista Iliana67ORCID,Wood Jonathan6ORCID,McCarthy Shane67ORCID,Chow William6ORCID,Tan Heok Hui8ORCID,Howe Kerstin6ORCID,Bandara Sepalika9,von Lintig Johannes9ORCID,Rüber Lukas1011ORCID,Durbin Richard67ORCID,Svardal Hannes412ORCID,Bendesky Andres12ORCID

Affiliation:

1. Zuckerman Mind Brain Behavior Institute, Columbia University, New York, NY, USA.

2. Department of Ecology, Evolution and Environmental Biology, Columbia University, New York, NY, USA.

3. Department of Biological Sciences, Columbia University, New York, NY, USA.

4. Department of Biology, University of Antwerp, 2020 Antwerp, Belgium.

5. Department of Biology, KU Leuven, 3000 Leuven, Belgium.

6. Wellcome Sanger Institute, Cambridge, UK.

7. Department of Genetics, University of Cambridge, Cambridge, UK.

8. Lee Kong Chian Natural History Museum, National University of Singapore, Singapore, Singapore.

9. Department of Pharmacology, Case Western Reserve University, Cleveland, OH, USA.

10. Aquatic Ecology and Evolution, Institute of Ecology and Evolution, University of Bern, Bern 3012, Switzerland.

11. Naturhistorisches Museum Bern, Bern 3005, Switzerland.

12. Naturalis Biodiversity Center, 2333 Leiden, Netherlands.

Abstract

Siamese fighting (betta) fish are among the most popular and morphologically diverse pet fish, but the genetic bases of their domestication and phenotypic diversification are largely unknown. We assembled de novo the genome of a wildBetta splendensand whole-genome sequenced 98 individuals across five closely related species. We find evidence of bidirectional hybridization between domesticated ornamental betta and other wildBettaspecies. We discoverdmrt1as the main sex determination gene in ornamental betta and that it has lower penetrance in wildB. splendens. Furthermore, we find genes with signatures of recent, strong selection that have large effects on color in specific parts of the body or on the shape of individual fins and that most are unlinked. Our results demonstrate how simple genetic architectures paired with anatomical modularity can lead to vast phenotypic diversity generated during animal domestication and launch betta as a powerful new system for evolutionary genetics.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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