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犬弓首蛔虫病是由弓首科(Toxocaridae)弓首属(Toxocara)的犬弓首蛔虫(T. canis)寄生于犬及犬科动物的小肠而引起的一种人兽共患寄生虫病,动物通过摄入其感染性虫卵或幼虫而感染.当人体感染时,幼虫通常在人体内不能发育为成虫,而是移行到各个器官和组织中[1],引起内脏幼虫移行症(visceral larva migrans,VLM)、眼睛幼虫移行症(ocular larva migrans,OLM)、神经弓首蛔虫病(neurological toxocariasis,NT)和隐性弓首蛔虫病(covert toxocariasis,CT)等[2],造成组织和器官损害,严重影响人类健康.
腺苷三磷酸结合盒转运蛋白(ATP-Binding Cassette transporters,ABC转运蛋白)是以ATP为驱动能的一类跨膜糖蛋白,负责转运内源性和异源性的生物大分子及小分子化合物,包括糖、氨基酸、多肽、细胞代谢产物、金属离子和药物等[3]. ABC转运蛋白在维持渗透压稳定、营养吸收、多药耐药、抗原加工、细胞分裂、孢子形成、繁殖等[4-6]诸多生物学过程中发挥重要作用.
已报道的寄生虫ABC转运蛋白基因有65种[7],对其功能的研究主要集中在ABC转运蛋白的耐药性方面[8],尽管已经对蠕虫ABC转运蛋白的功能和分子特征进行了研究,但是对犬弓首蛔虫ABC转运蛋白的研究还未见报道.本研究拟对犬弓首蛔虫ABC转运蛋白全长基因(Tc-abcg-5)进行克隆及序列分析,以期为ABCG5转运蛋白的功能研究奠定基础.
Cloning and Sequence Analysis of the Full-Length abcg-5 Gene of Toxocara canis
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摘要: 研究犬弓首蛔虫(Toxocara canis,T.canis)腺苷三磷酸结合盒转运蛋白(ATP-binding cassette transporters,ABC)亚家族G5基因(abcg-5)的分子特征.根据犬弓首蛔虫基因组数据库中的Tc-abcg-5基因序列设计引物,通过PCR技术克隆Tc-abcg-5全长基因,并进行多重序列比对和种系发育进化树分析.结果表明:该基因全长为1 902 bp,编码633个氨基酸.功能结构域分析发现TcABCG5蛋白包含1个ABC转运蛋白结构域和6个跨膜区,同时发现了高度保守的Walker A和Walker B模体.GO分析显示ABCG5具有ATP结合和ATP酶活性.种系发育进化树分析显示TcABCG5与猪蛔虫进化关系较近,与哺乳动物进化关系较远.Abstract: To study the molecular characteristics of ATP-binding cassette sub-family G member 5 (abcg-5) in Toxocara canis, the full-length coding sequence of Tc-abcg-5 gene was amplified using PCR amplification, multiple sequence alignment (MSA) was made and a phylogenetic tree was constructed. The results showed that the entire sequence of Tc-abcg-5 gene contained 1 902 bp, encoding a protein of 633 amino acids. TcABCG5 was found to contain one ABC transporter domain and six transmembrane regions. The highly conserved Walker A and Walker B motifs of the ABCG sub-family were also found. Gene ontology (GO) annotations showed that TcABCG5 had the molecular function of ATP binding and ATPase activity. Phylogenetic analysis indicated that TcABCG5 shared a high level of amino-acid sequence similarity with Ascaris suum, and shared a low level of amino-acid sequence similarity with mammals. This study is expected to lay a foundation for further functional researches of TcABCG5.
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表 1 Tc-abcg-5基因PCR扩增引物
引物名称 引物序列(5′-3′) Tc-abcg-5-1 F ATGGTACAGGATGAATTTGCTGGTGAT Tc-abcg-5-1 R GCATAACGGTATAAGTAAAAAGCGAGT Tc-abcg-5-2 F CTCACTCGCTTTTTACTTATACCGTTA Tc-abcg-5-2 R TTATTTCCTTTTGAATTTGTTCGTCCT -
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