Scholarlink

<p>Cartilaginous fishes (e.g., sharks, rays, and skates) cannot see blue or violet light, potentially because they lack the shortwave-sensitive cone opsin gene (<i>sws</i>). Widespread gene loss can occur during evolution, but the evolutionary mechanisms underlying <i>sws</i> loss remains unclear. Here, we construct whole-genome assemblies of <i>Okamejei kenojei</i> (skate) and <i>Prionace glauca</i> (blue shark). We then analyze the distribution characteristics and intragroup differences of opsin-related genes in cartilaginous fishes. Using a zebrafish model with <i>sws</i> deleted we infer that in the presence of SWS1 and SWS2, blue and violet light respectively, can induce cell aging. This is followed by photoreceptor layer thinning, demonstrating, <i>sws</i> loss aids in preventing shortwave light damage to the eye. In the retinas of numerous cartilaginous fishes, the tapetum lucidum strongly reflects light. Therefore, in cartilaginous fish, the existence of tapetum lucidum in the retina and loss of <i>sws</i> may be interdependent; in other words, this adaptive gene loss may increase cartilaginous fish fitness.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Adaptive loss of shortwave-sensitive opsins during cartilaginous fish evolution

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年8月18日

查看全文
  • Bo Zhang,
  • Yidong Feng,
  • Meiqi Lv,
  • Lei Jia,
  • Yongguan Liao,
  • Xiaoyan Xu,
  • Axel Meyer,
  • Jinsheng Sun,
  • Guangyi Fan,
  • Yumin Li,
  • Yaolei Zhang,
  • Na Zhao,
  • Yunkai Li,
  • Baolong Bao

摘要

Cartilaginous fishes (e.g., sharks, rays, and skates) cannot see blue or violet light, potentially because they lack the shortwave-sensitive cone opsin gene (sws). Widespread gene loss can occur during evolution, but the evolutionary mechanisms underlying sws loss remains unclear. Here, we construct whole-genome assemblies of Okamejei kenojei (skate) and Prionace glauca (blue shark). We then analyze the distribution characteristics and intragroup differences of opsin-related genes in cartilaginous fishes. Using a zebrafish model with sws deleted we infer that in the presence of SWS1 and SWS2, blue and violet light respectively, can induce cell aging. This is followed by photoreceptor layer thinning, demonstrating, sws loss aids in preventing shortwave light damage to the eye. In the retinas of numerous cartilaginous fishes, the tapetum lucidum strongly reflects light. Therefore, in cartilaginous fish, the existence of tapetum lucidum in the retina and loss of sws may be interdependent; in other words, this adaptive gene loss may increase cartilaginous fish fitness.