Molecular cloning of ultraviolet-sensitive visual pigment in juvenile Champsocephalus gunnari (Channichthyidae) |
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| Authors: | T Miyazaki M Nakata S Kasagi T Iwami M Yamauchi S Kawamura |
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| Institution: | (1) Graduate School of Bioresources, Mie University, Tsu, Mie 514-8507, Japan;(2) Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8562, Japan;(3) Tokyo Kasei-Gakuin University, Machida, Tokyo 194-0292, Japan;(4) National Institute of Radiological Sciences, Inage, Chiba 263-8555, Japan |
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| Abstract: | We examined histologically the retinal cone photoreceptor mosaics of 0- to 6-year-old Champsocephalus gunnari. In the retina of 0- to 3-year-old fish, three types of cone cells, single-, double- and triple-cone, were identified. The
triple-cone cells were localized near the optic papilla. In the outer region of the optic papilla, double-cone and single-cone
cells were aligned alternately. Only double-cone cells were distributed in the peripheral retina. There were very few single-cone
cells in the retinas of 4- to 6-year-old fish. The putative ultraviolet (UV)-sensitive visual pigment (SWS1) gene was isolated
from the retina of 0- to 1-year-old fish. The recombinant opsin, encoded by this gene, showed a peak absorbance at 358 nm.
It was considered that the UV sensitivity in juvenile C. gunnari might increase foraging efficiency by enhancing the contrast of the planktonic prey in the Antarctic summer. |
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