Molecular evolution of bat color vision genes.
Molecular evolution of bat color vision genes.
复制标题
DOI：
10.1093/molbev/msh015
复制
发表时间：
2003-12
影响因子：
10.7
通讯作者：
Daryi Wang;Todd Oakley;Jeffrey P. Mower;L. Shimmin;So-Yong Yim;R. Honeycutt;H. Tsao;Wen-Hsiung Li
中科院分区：
文献类型：
--
作者：
Daryi Wang;Todd Oakley;Jeffrey P. Mower;L. Shimmin;So-Yong Yim;R. Honeycutt;H. Tsao;Wen-Hsiung Li
蝙蝠的两个亚目，巨翅目（巨型蝙蝠）和小翼手目（微型蝙蝠），使用不同的感觉方式来感知环境。巨型蝙蝠是黄昏性动物，依赖于发达的眼睛和视觉通路，而微型蝙蝠则占据夜间生态位，并使用声音定向或回声定位而不是视觉作为感知环境的主要手段。鉴于它们的感觉系统存在差异，我们决定研究这两个蝙蝠亚目的色觉（视蛋白基因）的功能和进化。中/长波长 (M/L) 和短波长 (S) 视蛋白基因对两种食果巨型蝙蝠 (Haplonycteris fischeri 和 Pteropus dasymallus formosus) 以及一种食虫小蝙蝠 (Myotis velifer) 进行测序。与灵长类动物的情况相反，许多夜间活动的物种已经失去了功能性的 S 视蛋白基因，我们检查的黄昏和严格夜间活动的蝙蝠物种都具有功能性的 M/L 和 S 视蛋白基因。令人惊讶的是，这些蝙蝠体内的S视蛋白可能对紫外线敏感，而紫外线在黎明和黄昏时相对较多。这些蝙蝠中的 M/L 视蛋白似乎是 L 型，对红色敏感，可能有助于识别叶子中的水果或用于其他目的。最有趣的是，H. fischeri 最近出现了 M/L 视蛋白基因的重复，这是迄今为止唯一已知的非灵长类哺乳动物中视蛋白基因重复的病例。其中一些观察结果是出乎意料的，可能有助于了解夜间生活对哺乳动物视蛋白基因进化和蝙蝠生活史特征进化的影响。
The two suborders of bats, Megachiroptera (megabats) and Microchiroptera (microbats), use different sensory modalities for perceiving their environment. Megabats are crepuscular and rely on a well-developed eyes and visual pathway, whereas microbats occupy a nocturnal niche and use acoustic orientation or echolocation more than vision as the major means of perceiving their environment. In view of the differences associated with their sensory systems, we decided to investigate the function and evolution of color vision (opsin genes) in these two suborders of bats. The middle/long wavelength (M/L) and short wavelength (S) opsin genes were sequenced from two frugivorous species of megabats, Haplonycteris fischeri and Pteropus dasymallus formosus, and one insectivorous species of microbat, Myotis velifer. Contrary to the situation in primates, where many nocturnal species have lost the functional S opsin gene, both crepuscular and strictly nocturnal species of bats that we examined have functional M/L and S opsin genes. Surprisingly, the S opsin in these bats may be sensitive to UV light, which is relatively more abundant at dawn and at dusk. The M/L opsin in these bats appears to be the L type, which is sensitive to red and may be helpful for identifying fruits among leaves or for other purposes. Most interestingly, H. fischeri has a recent duplication of the M/L opsin gene, representing to date the only known case of opsin gene duplication in non-primate mammals. Some of these observations are unexpected and may provide insights into the effect of nocturnal life on the evolution of opsin genes in mammals and the evolution of the life history traits of bats in general.