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Seeing red to being red: Conserved genetic mechanism for red cone oil droplets and co-option for red coloration in birds and turtles

Journal article
Authors H. Twyman
N. Valenzuela
R. Literman
Staffan Andersson
N. I. Mundy
Published in Proceedings of the Royal Society of London. Biological Sciences
Volume 283
Issue 1836
ISSN 0962-8452
Publication year 2016
Published at Department of Biological and Environmental Sciences
Language en
Links dx.doi.org/10.1098/rspb.2016.1208
Keywords Birds, Carotenoid coloration, Colour vision, CYP2J, Retinal oil droplets, Turtles
Subject categories Evolutionary Biology, Genetics

Abstract

Avian ketocarotenoid pigments occur in both the red retinal oil droplets that contribute to colour vision and bright red coloration used in signalling. Turtles are the only other tetrapods with red retinal oil droplets, and some also display red carotenoid-based coloration. Recently, the CYP2J19 gene was strongly implicated in ketocarotenoid synthesis in birds. Here, we investigate CYP2J19 evolution in relation to colour vision and red coloration in reptiles using genomic and expression data. We show that turtles, but not crocodiles or lepidosaurs, possess a CYP2J19 orthologue, which arose via gene duplication before turtles and archosaurs split, and which is strongly and specifically expressed in the ketocarotenoid-containing retina and red integument. We infer that CYP2J19 initially functioned in colour vision in archelosaurs and conclude that red ketocarotenoid-based coloration evolved independently in birds and turtles via gene regulatory changes of CYP2J19. Our results suggest that red oil droplets contributed to colour vision in dinosaurs and pterosaurs. © 2016 The Author(s) Published by the Royal Society. All rights reserved.

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