The opsin genes of amazonian cichlids

Molecular Ecology
Daniel Escobar-CamachoKaren L Carleton

Abstract

Vision is a critical sense for organismal survival with visual sensitivities strongly shaped by the environment. Some freshwater fishes with a Gondwanan origin are distributed in both South American rivers including the Amazon and African rivers and lakes. These different habitats likely required adaptations to murky and clear environments. In this study, we compare the molecular basis of Amazonian and African cichlid fishes' visual systems. We used next-generation sequencing of genomes and retinal transcriptomes to examine three Amazonian cichlid species. Genome assemblies revealed six cone opsin classes (SWS1, SWS2B, SWS2A, RH2B, RH2A and LWS) and rod opsin (RH1). However, the functionality of these genes varies across species with different pseudogenes found in different species. Our results support evidence of an RH2A gene duplication event that is shared across both cichlid groups, but which was probably followed by gene conversion. Transcriptome analyses show that Amazonian species mainly express three opsin classes (SWS2A, RH2A and LWS), which likely are a good match to the long-wavelength-oriented light environment of the Amazon basin. Furthermore, analysis of amino acid sequences suggests that the short-wavelength-sens...Continue Reading

Associated Datasets

Dec 15, 2016·Daniel Escobar-CamachoKaren L. Carleton

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Citations

Mar 9, 2017·Molecular Ecology·Gregory L Owens, Diana J Rennison
Nov 10, 2017·Genome Biology and Evolution·Benjamin SandkamFelix Breden
Jun 16, 2018·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Nidal KaragicJulián Torres-Dowdall
Feb 23, 2019·The Journal of Experimental Biology·Daniel Escobar-CamachoKaren L Carleton
Apr 27, 2017·Molecular Biology and Evolution·Julián Torres-DowdallAxel Meyer
Nov 29, 2019·The Journal of Experimental Biology·Valerio TettamantiFabio Cortesi
Apr 25, 2020·The Journal of Experimental Biology·Karen L CarletonN Justin Marshall

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