引用本文:	刘加林,贾永义,刘士力,郑建波,迟美丽,程顺,李飞,尹绍武,顾志敏.太湖鲂鲌F₂代GH基因结构、系统发育和表达特征.海洋与湖沼,2020,51(6):1440-1451.

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太湖鲂鲌F₂代GH基因结构、系统发育和表达特征
刘加林^1,2, 贾永义¹, 刘士力¹, 郑建波¹, 迟美丽^1,3, 程顺¹, 李飞¹, 尹绍武², 顾志敏¹
1.浙江省淡水水产研究所农业农村部淡水渔业健康养殖重点实验室/浙江省淡水水产遗传育种重点实验室湖州 313001;2.南京师范大学生命科学学院南京 210023;3.1. 浙江省淡水水产研究所农业农村部淡水渔业健康养殖重点实验室/浙江省淡水水产遗传育种重点实验室湖州 313001

摘要:

采用PCR及T-A克隆技术，从基因组DNA成功克隆三角鲂、太湖鲂鲌、太湖鲂鲌F₂代含完整阅读框的生长激素基因全序列，经测序拼接获得序列全长分别为6009、6042和6058bp，转录单元长分别为2049、2014和2045bp。三种群体的GH基因序列均包括五个外显子、四个内含子及5'侧翼区和3'侧翼区；编码氨基酸序列均为633bp，编码210个氨基酸。对3个目14种鱼类进行同源性及系统发育分析发现，太湖鲂鲌F₂代与其祖父母的遗传距离相比亲本较近。另取10尾太湖鲂鲌F₂代，对其进行GH基因编码区SNPs筛选，共得到7处SNPs，其中有3处位点的突变导致其氨基酸序列发生了明显的变化；对其蛋白质结构分析发现，突变后的氨基酸残基导致蛋白质二级结构发生改变。我们将该10尾个体按体重分为小个体组和大个体组，经组织表达分析发现，大个体组中的个体具有较高的转录水平，进一步分析发现其氨基酸残基有所不同。

关键词: 太湖鲂鲌属间杂交生长激素克隆 SNPs 表达分析

DOI：10.11693/hyhz20200100006

分类号:Q789;S965

基金项目:浙江省重点研发计划项目，2016C02055-1号。

附件

STRUCTURE, PHYLOGENY AND TISSUE DISTRIBUTION OF GH IN CULTER ALBURNUS♀×MEGALOBRAMA TERMINALIS♂

LIU Jia-Lin^1,2, JIA Yong-Yi¹, LIU Shi-Li¹, ZHENG Jian-Bo¹, CHI Mei-Li^1,3, CHENG Shun¹, LI Fei¹, YIN Shao-Wu², GU Zhi-Min¹

1.Key Laboratory of Healthy Freshwater Aquaculture of Ministry of Agriculture and Rural Development/Key Laboratory of Freshwater Aquatic Animal Genetic and Breeding of Zhejiang Province, Zhejiang Institute of Freshwater Fisheries, Huzhou 313001, China;2.School of Life Science, Nanjing Normal University, Nanjing 210023, China;3.1. Key Laboratory of Healthy Freshwater Aquaculture of Ministry of Agriculture and Rural Development/Key Laboratory of Freshwater Aquatic Animal Genetic and Breeding of Zhejiang Province, Zhejiang Institute of Freshwater Fisheries, Huzhou 313001, China

Abstract:

Using polymerase chain reaction (PCR) and T-A cloning technology, we successfully obtained complete sequences of growth hormone (GH) gene with complete open reading frames from complete genomic DNA from three fish populations Megalobrama terminalis, Culter alburnus♀×Megalobrama terminalis♂ (Ca×Mt), and the F₂ of Ca×Mt. The total length of the sequence was 6009, 6042, and 6058bp, respectively, and the length of the transcription unit was 2049, 2014, and 2045bp, respectively. The GH gene sequence of the three populations includes five exons, four introns, 5'UTR (untranslated region) and 3'UTR. All of them encoded 633bp amino acid sequence and 210 amino acids. The homology and phylogeny analysis on 14 fish species from 3 orders showed that the genetic distance between the F₂ and its grandparents was closer than that of their parents. Seven SNPs (single nucleotide polymorphism) were obtained from 10 individuals of the F₂, from which three mutations were observed causing significant changes in amino acid sequence. The analysis of protein structure showed that the mutated amino acid residue resulted in the change of protein secondary structure. We divided the 10 individuals into small and large body groups according to their body weight. Through tissue expression analysis, we found that the individuals in the large group had higher transcription level, and further analysis found that their amino acid residues were different.

Key words: Culter alburnus♀×Megalobrama terminalis♂ intergeneric cross growth hormone cloning SNPs expression analysis