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猪新基因KCNJ12编码区电子克隆、RT-PCR验证和组织表达分析

DOI: 10.7668/hbnxb.2014.01.009, PP. 41-49

Keywords: 内向整流型钾离子通道亚家族J成员12,电子克隆,版纳微型猪近交系,生物信息学,组织表达

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Abstract:

通过NCBI下载猪近缘物种的KCNJ12基因序列,在线BLAST比对获得猪EST序列、参考基因组序列和高通量基因组序列。利用Lasergene软件电子克隆猪KCNJ12基因编码区序列及部分侧翼序列。针对编码区设计特异引物并以版纳微型猪近交系BMI为研究材料进行试验验证,同时应用半定量RT-PCR技术对BMI31种重要组织进行了表达分析。研究获得了猪KCNJ121290bp的编码区序列(GenBank登录号:KC505155,对应的氨基酸登录号:AGK36093)。生物信息学分析表明,该基因编码429个氨基酸,预测的蛋白质分子量(Mw)为48.63kDa,等电点(pI)为5.66。蛋白质结构分析显示,KCNJ12存在2个保守域,3个跨膜结构域,无信号肽;疏水性分析表明其N端和C端均具有亲水性;亚细胞定位显示,该蛋白位于细胞质的概率是94.1%。系统进化分析表明,猪与牛、羊的亲缘关系最近。组织表达分析表明,KCNJ12基因在31个被检组织中存在明显的表达差异,在小脑中高表达;在肌肉、结肠、盲肠、食管、皮肤、大脑、下丘脑及脊髓中中度表达;在胸腺、肝、直肠及脑干中低表达;在颌下腺、睾丸、甲状腺、附睾、肺、心、脾、肾上腺、淋巴结、肾、胰脏、十二指肠、空肠、回肠、胃、垂体、松果体及舌下腺中不表达。研究结果为该基因在猪中的功能研究提供依据。

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