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薄晶, 吕文琪, 孙宁, 王成, 王堃, 刘潘, 冯晨光, 何舜平, 杨连东. 2022: 月鱼基因组阐明水生恒温动物的进化. 动物学研究, 43(1): 26-29. DOI: 10.24272/j.issn.2095-8137.2021.183
引用本文: 薄晶, 吕文琪, 孙宁, 王成, 王堃, 刘潘, 冯晨光, 何舜平, 杨连东. 2022: 月鱼基因组阐明水生恒温动物的进化. 动物学研究, 43(1): 26-29. DOI: 10.24272/j.issn.2095-8137.2021.183
Jing Bo, Wen-Qi Lv, Ning Sun, Cheng Wang, Kun Wang, Pan Liu, Chen-Guang Feng, Shun-Ping He, Lian-Dong Yang. 2022: Opah (Lampris megalopsis) genome sheds light on the evolution of aquatic endothermy. Zoological Research, 43(1): 26-29. DOI: 10.24272/j.issn.2095-8137.2021.183
Citation: Jing Bo, Wen-Qi Lv, Ning Sun, Cheng Wang, Kun Wang, Pan Liu, Chen-Guang Feng, Shun-Ping He, Lian-Dong Yang. 2022: Opah (Lampris megalopsis) genome sheds light on the evolution of aquatic endothermy. Zoological Research, 43(1): 26-29. DOI: 10.24272/j.issn.2095-8137.2021.183

月鱼基因组阐明水生恒温动物的进化

Opah (Lampris megalopsis) genome sheds light on the evolution of aquatic endothermy

  • 摘要: 由于水的高导热性,鱼类在保持体温方面面临着巨大的挑战,只有不到0.1%的鱼类能够保留内部产生的热量。恒温鱼类具有多种竞争性的优势,比如高的游泳效率、耐寒性增强,能够保持垂直迁移的视觉敏度,生态位扩张。月鱼,Lampris megalopsis (Lampridiformes),是目前已知的唯一具有全身恒温的鱼,但其分子机制尚不清楚。因此,月鱼为研究水生动物全身恒温的进化机制提供了一个强有力的机会。在该研究中,我们组装了一个1.09 Gb的月鱼基因,与其他非恒温鱼类基因组的比较分析,揭示恒温鱼类的遗传基础。基于正选择、快速进化和基因家族的扩张分析,我们发现了一些候选基因与月鱼的产热和保温相关。这是首次报道大眼太平洋月鱼基因组,我们的结果不仅阐述了月鱼恒温适应性的可能分子和遗传机制也增加了对恒温鱼类的理解。

     

    Abstract: Endothermy is the ability to generate and conserve metabolic heat to maintain body temperature above that of the surrounding environment. Endothermy enhances the physiological and ecological advantages of mammals, birds, and certain fish species. The opah, Lampris megalopsis (Lampridiformes), is the only known fish to exhibit whole-body endothermy. Currently, however, the underlying molecular mechanism for this remains unclear. Hence, the opah offers an excellent opportunity to study the evolutionary mechanism of whole-body endothermy in aquatic animals. In this study, we assembled a L. megalopsis genome (1.09 Gb in size) and performed comparative genomic analysis with ectothermic fish to reveal the genetic basis of endothermy. Based on analysis of positive selection, rapid evolution, and gene family expansion, we discovered several genes that likely contributed to thermogenesis and heat preservation. As the first reported L. megalopsis genome, our results not only clarify the possible molecular and genetic mechanisms involved in endothermic adaptation but also increase our understanding of endothermic fish biology.

     

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