Cloning and Sequence Analysis of Lactate Dehydrogenase C(LDH-C)Gene from Black-lipped Pika in Western Sichuan Plateau

川西高原黑唇鼠兔乳酸脱氢酶C基因cDNA的克隆及序列分析(摘要)(英文)

[Objective] The aim was to lay a foundation for research of contraceptive rodenticide with LDH-C4 as target protein. [ Method] EST sequence of LDH-C gene from black-lipped pika was cloned by PCR with degenerate primers; then the full length open reading frame （ORF） and 3＇UTR sequence were cloned by RACE technique. [ Result] The full length cDNA was 1 498 bp containing an ORF of 996 bp and a 3＇UTR of 486 bp. The ORF encoded a polypeptide of 332 amino acids. The alignment of LDH-C gene ORF nucleotide sequences from different species showed that the gene was conserved even between large taxons. The phylogenic tree showed that black-lipped pika LDH-C was closer to prima- tes and artiodactyla than to rodents. [Conclusion] cDNA sequence of LDH-C gene from black-lipped pika was cloned successfully.

[目的]为研究以鼠兔LDH-C4为靶蛋白的节育型鼠药奠定基础。[方法]黑唇鼠兔属于兔形目,鼠兔属,在GenBank数据库里没有兔形目物种LDH-C基因的相关序列,故采用设计简并引物的方法进行克隆。设计的3条简并引物序列为:D-Ps:5′-atgtcmacygtcaaggagcagct-3′:D-Pa1:5′-gcagayacabtgtaatcttttcc-3′;D-Pa2:5′-ttacarccacttccratyac-3′。用反转录生成的cDNA作为模板,采用巢式PCR法克隆LDH-C基因的EST,再根据EST序列设计了2条基因特异引物,采用3′RACE技术克隆LDH-C基因的3′端,2条基因特异引物为Pika-Ps1:5-cttgcccttgttgatgttgcaga-3和Pika-Ps2:5-ggatcttcaacatggcagtct-3。核酸序列的分析、拼接和相似性搜索采用Vector NTI Suite 9软件,系统发生树的构建用Mega 4.0软件,采用邻接法。[结果]黑唇鼠兔的LDH-C基因的cDNA全长1 498 bp,其中ORF长996 bp,编码332个氨基酸,3′UTR长486 bp。ORF序列比对显示LDH-C基因在大的分类单位上均很保守。系统树分析显示黑唇鼠兔的LDH-C基因和灵长类及偶蹄目的遗传距离较近,和啮齿目较远。[结论]成功的克隆得到了黑唇鼠兔的LDH-C基因的cDNA序列。