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Isolation of freshwater and deep-sea type opsin genes from the common Japanese conger
Authors:H. Zhang,§  ,K. Futami,&Dagger  ,Y. Yamada,&dagger  ,N. Horie,&dagger  ,A. Okamura,&dagger  ,T. Utoh,&dagger  ,N. Mikawa,&dagger  ,S. Tanaka,&dagger  ,N. Okamoto,&Dagger  ,H. P. Oka,&dagger  
Affiliation:Department of Marine Sciences, University of Connecticut, Groton, CT 06340, U.S.A.;IRAGO Institute, Shinden 377-Ehima, Atsumi-cho, Atsumi-gun, Aichi 441-3605, Japan;Department of Aquatic Biosciences, Tokyo University of Fisheries, 4-5-7 Konan Minato-ku, Tokyo 108-8477, Japan
Abstract:Two rod-like opsin genes, conf and cond , were isolated from the common Japanese conger Conger myriaster . The predicted proteins of conf and cond consisted of 354 and 350 amino acid (aa) residues respectively, and the aa identity was 87.4%. Phylogenetic analysis suggested that conf and cond are homologous to the freshwater type and the deep-sea type rod opsin genes of freshwater eels. RT-PCR analyses revealed that in both juveniles and adults cond is expressed in the retina and pineal complex, while conf is only expressed in the pineal complex at a low level.
Keywords:common Japanese conger    freshwater type opsin    deep-sea type opsin
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