畜牧兽医学报 ›› 2013, Vol. 44 ›› Issue (5): 703-709.doi: 10.11843/j.issn.0366-6964.2013.05.006

• 遗传繁育 • 上一篇    下一篇

1种胞外域仅含1个配体结合区的鸭催乳素受体基因的剪接异形体克隆及基因多态性分析

吉文林1,2,4,段修军2,4,宦海琳3,丁潜3,孙国波2,4,董飚2,4,陈章言2,4,陈国宏1*   

  1. (1. 扬州大学动物科学与技术学院,扬州225009; 2. 江苏畜牧兽医职业技术学院,泰州 225300;3. 江苏省农业科学院畜牧研究所,南京 210014; 4. 国家级水禽基因库,泰州 225300)
  • 收稿日期:2012-12-11 出版日期:2013-05-23 发布日期:2013-05-23
  • 通讯作者: 陈国宏,教授,博导,主要从事动物遗传资源评价与利用研究,E-mail: ghchen@yzu.edu.cn
  • 作者简介:吉文林(1958-),男,江苏泰州人,研究员,博士生,主要从事水禽遗传育种研究,E-mail: wenlinj117@126.com
  • 基金资助:

    江苏省农业科技自主创新资金项目[cx(10)123];江苏省农业三新工程项目[SX(2011)198]

An Isoform with Only One Ligand Binding Region of Prolact in Receptor Gene and Its Single Nucleotide Polymorphism in the Duck

JI Wen-lin1,2,4, DUAN Xiu-jun2,4, HUAN Hai-lin3, DING Qian3, SUN Guo-bo2,4,DONG Biao2,4, CHEN Zhang-yan2,4, CHEN Guo-hong1*   

  1. (1.College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China;2.Jiangsu Provincial Animal Husbandry and Veterinary College,Taizhou 225300, China;3. Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014,China; 4. National Gene Bank of Waterfowl Resources, Taizhou 225300, China)
  • Received:2012-12-11 Online:2013-05-23 Published:2013-05-23

摘要:

旨在了解鸭催乳素受体的作用,应用RACE技术克隆到了1种胞外域仅含1个配体结合区的剪接异形体。序列分析表明,剪接异形体长2 535 bp,含431 bp 5′-UTR、1 884 bp编码区和220 bp 3′-UTR,可划分为11个外显子。预测蛋白含627个氨基酸,成熟蛋白603个氨基酸,N端为24个氨基酸信号肽。不同于胞外域串联2个配体结合区的典型禽类催乳素受体,预测蛋白胞外域仅含1个配体结合区,类似于哺乳动物催乳素受体。配体结合区同样含有2对半胱氨酸残基和1个WSXWS的5肽WS基序,此为细胞因子受体超家族I型受体中高度保守的2个典型特征。同时,筛选了催乳素受体基因的1个突变位点和1个SNP位点,分别位于5′-及3′-UTR区。其中,3′-UTR区SNP位点经χ2适合性检验,在鸭群体中未达到Hardy-Weinberg平衡状态。

Abstract:

 To understand PRLR’s role in duck, a novel isoform with only one ligand binding region of duck prolactin receptor gene (PRLR) was identified by rapid amplification of cDNA ends (RACE) strategy. Sequence analysis showed that the isoform was 2 535 bp long, contained 431 bp 5′ untranslated region (5′-UTR), 1 884 bp coding sequence and 220 bp 3′ untranslated region (3′-UTR) and comprises 11 exons. The predicted PRLR contained 627 amino acids (aa) and comprises a signal peptide of 24 aa at N-terminus, thus, its mature protein was 603 aa long. Different from canonical avian PRLRs with two tandemly repeated ligand binding regions within the extracellular domain, the putative protein only contained one ligand binding region, similar to the vertebrate PRLRs.The ligand binding region contained 2 pairs of cysteine residues and a pentapeptide of 5 aa known as WS motif as well, the 2 typical features of highly conserved in the members of class 1 cytokine receptor superfamily. In the meanwhile, we investigated one point mutation and one single nucleotide polymorphism (SNP) which located in 5′- and 3′-UTRs of the duck prolactin receptor respectively, and the SNP (C2 391T) in the 3′-UTR was in an extreme departure from Hardy-Weinberg equilibrium in the duck population by Chi-square test.

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