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Gene expression dynamics during rapid organismal diversification in African cichlid fishes

El Taher, Athimed and Böhne, Astrid and Boileau, Nicolas and Ronco, Fabrizia and Indermaur, Adrian and Widmer, Lukas and Salzburger, Walter. (2020) Gene expression dynamics during rapid organismal diversification in African cichlid fishes. Nature ecology & evolution. 10.1038/s41559-020-01354-3.

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Abstract

Changes in gene expression play a fundamental role in phenotypic evolution. Transcriptome evolutionary dynamics have so far mainly been compared among distantly related species and remain largely unexplored during rapid organismal diversification, in which gene regulatory changes have been suggested as particularly effective drivers of phenotypic divergence. Here we studied gene expression evolution in a model system of adaptive radiation, the cichlid fishes of African Lake Tanganyika. By comparing gene expression profiles of 6 different organs in 74 cichlid species representing all subclades of this radiation, we demonstrate that the rate of gene expression evolution varies among organs, transcriptome parts and the subclades of the radiation, indicating different strengths of selection. We found that the noncoding part of the transcriptome evolved more rapidly than the coding part, and that the gonadal transcriptomes evolved more rapidly than the somatic ones, with the exception of liver. We further show that the rate of gene expression change was not constant over the course of the radiation but accelerated at its later phase. Finally, we show that-at the per-gene level-the evolution of expression patterns is dominated by stabilizing selection.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Integrative Biologie > Evolutionary Biology (Salzburger)
UniBasel Contributors:Salzburger, Walter
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Springer nature
ISSN:2397-334X
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
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Last Modified:08 Feb 2021 07:58
Deposited On:01 Feb 2021 15:33

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