The vertebrate ancestral repertoire of visual opsins, transducin alpha subunits and oxytocin/vasopressin receptors was established by duplication of their shared genomic region in the two rounds of early vertebrate genome duplications

@inproceedings{Lagman2013TheVA,
  title={The vertebrate ancestral repertoire of visual opsins, transducin alpha subunits and oxytocin/vasopressin receptors was established by duplication of their shared genomic region in the two rounds of early vertebrate genome duplications},
  author={David Lagman and Daniel Ocampo Daza and Jenny Widmark and Xes{\'u}s M. Abalo and G{\"o}rel Sundstr{\"o}m and Dan Larhammar},
  booktitle={BMC Evolutionary Biology},
  year={2013}
}
Vertebrate color vision is dependent on four major color opsin subtypes: RH2 (green opsin), SWS1 (ultraviolet opsin), SWS2 (blue opsin), and LWS (red opsin). Together with the dim-light receptor rhodopsin (RH1), these form the family of vertebrate visual opsins. Vertebrate genomes contain many multi-membered gene families that can largely be explained by the two rounds of whole genome duplication (WGD) in the vertebrate ancestor (2R) followed by a third round in the teleost ancestor (3R… CONTINUE READING
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Evolution of the vertebrate paralemmin gene family: ancient origin of gene duplicates suggests distinct functions

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