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Comparative transcriptome analysis between aquatic and aerial breathing organs of Channa argus to reveal the genetic basis underlying bimodal respiration

文献类型： 外文期刊

作者： Jiang, Yanliang 1 ; Feng, Shuaisheng 1 ; Xu, Jian 1 ; Zhang, Songhao 1 ; Li, Shangqi 1 ; Sun, Xiaoqing 1 ; Xu, Peng 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Ctr Appl Aquat Genom, Beijing Key Lab Fishery Biotechnol, CAFS Key Lab Aquat Genom, Beijing 100141, Peoples R China

2.Shanghai Ocean Univ, Coll Life Sci, Shanghai 201306, Peoples R China

关键词： Bimodal respiration; Transcriptome; Suprabranchial chamber; Northern snakehead; Channa argus

期刊名称：MARINE GENOMICS （ 影响因子：1.71； 五年影响因子：1.969 ）

ISSN： 1874-7787

年卷期： 2016 年 29 卷

页码：

收录情况： SCI

摘要： Aerial breathing in fish was an important adaption for successful survival in hypoxic water. All aerial breathing fish are bimodal breathers. It is intriguing that they can obtain oxygen from both air and water. However, the genetic basis underlying bimodal breathing has not been extensively studied. In this study, we performed next-generation sequencing on a bimodal breathing fish, the Northern snakehead, Channa argus, and generated a transcriptome profiling of C argus. A total of 53,591 microsatellites and 26,378 SNPs were identified and classified. A Ka/Ks analysis of the unigenes indicated that 63 genes were under strong positive selection. Furthermore, the transcriptomes from the aquatic breathing organ (gill) and the aerial breathing organ (suprabranchial chamber) were sequenced and compared, and the results showed 1,966 genes up-regulated in the gill and 2,727 genes up-regulated in the suprabranchial chamber. A gene pathway analysis concluded that four functional categories were significant, of which angiogenesis and elastic fibre formation were up-regulated in the suprabranchial chamber, indicating that the aerial breathing organ may be more efficient for gas exchange due to its highly vascularized and elastic structure. In contrast, ion uptake and transport and acid-base balance were up -regulated in the gill, indicating that the aquatic breathing organ functions in ion homeostasis and acid-base balance, in addition to breathing. Understanding the genetic mechanism underlying bimodal breathing will shed light on the initiation and importance of aerial breathing in the evolution of vertebrates. (C) 2016 Elsevier B.V. All rights reserved.

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