Multiple origins of the green-sensitive opsin genes in fish |
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| Authors: | Elizabeth A. Register Ruth Yokoyama Shozo Yokoyama |
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| Affiliation: | (1) Merck Sharp and Dohme Research Laboratories, 07065-0900 Rahway, NJ, USA;(2) Biological Research Laboratories, Department of Biology, Syracuse University, 130 College Place, 13244 Syracuse, NY, USA |
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| Abstract: | Vertebrate opsins are divided into four major groups: RH1 (rhodopsins), RH2 (rhodopsinlike with various absorption sensitivities), SWS (short-wavelength sensitive), and LWS/MWS (long and middle-wavelength sensitive) groups. The green opsin genes (g101Afand g101Af) in a Mexican characin Astyanax fasciatus belong to the LWS/MWS group, whereas those in goldfish belong to the RH2 group (Yokoyama 1994, Mol Biol Evol 11:32–39). A newly isolated opsin gene (rh11Af) from A. fasciatus contains five exons and four introns, spanning 4.2 kilobases from start to stop codons. This gene is most closely related to the two green opsin genes of goldfish and belongs to the RH2 group. In the LWS/MWS group, gene duplication of the ancestral red and green opsin genes predates the speciation between A. fasciatus and goldfish, suggesting that goldfish also has an additional gene which is orthologous to g101Af and g103Af.Correspondence to: S. Yokoyama |
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| Keywords: | Opsin gene Visual pigment Molecular evolution Astyanax fasciatus |
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