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Significance of the succession and/or the disappearance of ultraviolet photosensitivity in the Antarctic fish suborder Notothenioidei

南极鱼类Notothenioidei亚目紫外线光敏性的继承和/或消失的意义

基本信息

批准号：
17570077
负责人：
MIYAZAKI Taeko
金额：
$ 2.4万
依托单位：
Mie University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17570077/
关键词：
Notothenioidei opsin color vision retina ultraviolet photosensitivity Antarctica specintion molecular evolution 視覚進化

项目摘要

This study aimed to investigate mechanism of the succession and/or the disappearance of ultraviolet photosensitivity in the teleosts. To achieve this aim, Antarctic fishes suborder Notothenioidei, which accomplished evolution in Antarctic sea endemically, were used for analyzing ultraviolet opsin gene and histological presence of UV-photoreceptor(UV-cone) in their retina.1) The UV-cone presented in more endemic 6 families. In the 7th family Bthydraconidae, speceis having UV-cone and not-having were intermingled. Further, the channichthyid species which are most specialized in Antarctica lost UV-cones. Therefore, it was guessed that the UV-cone is a character being lost during the process of speciation in this suborder.2)The full length UV-opsin gene was 1008bp and encoded 336 amino acids. Phylogenetic analysis of UV-opsin genes among 9 species in 3 families expressed a possibility it correspond to speciation of nototheniid species.3)In the retina of juvenile Champsocephalus gunnari belonging to Channichthyidae, the UV-cone presented and UV-opsin gene was isolated. Therefore, in channichthyiids, it was supposed that even if UV-cone was lack in adult fish, the juvenile fish have the UV-cone and express UV-opsin mRNA in their retina.4)The blue-, green- and red-opsin gene was 1056, 1056 and 1068bp and encoded 352 and 356 amino acid residues, respectively. Lower homology was shown for blue- and green-opsins than red-opsin between other teleost genes. This may indicate that fish evolved adaptively in light environment of their habitat depth or place, and then evolved blue- and green-opsin genes species-specifically

本研究旨在探讨硬骨鱼类紫外光敏感性演替和/或消失的机制。本研究以南极特有鱼类南极鱼亚目（Notothenioidei）为研究对象，分析了南极特有鱼类视网膜中紫外光视蛋白基因和紫外光感受器（UV-cone）的组织学存在。在第7科中，有UV锥的种类与无UV锥的种类混杂。此外，在南极洲最专门的海峡鱼科物种失去了紫外线锥。因此，推测紫外视锥是该亚目在物种形成过程中丢失的一个特征。2）紫外视蛋白基因全长1008 bp，编码336个氨基酸。对3科9种鱼的UV视蛋白基因进行系统发育分析，结果表明，它们可能与南极鱼类的物种分化相对应。4）蓝、绿色和红色视蛋白基因分别为1056、1056和1068 bp，编码352和356个氨基酸残基。蓝视蛋白和绿视蛋白的同源性低于红视蛋白。这可能表明鱼类在其栖息地深度或位置的光环境中适应性进化，然后进化出蓝视蛋白和绿视蛋白基因的种特异性