作者机构:
[Song, Hui-Qun; Liu, Guo-Hua; Zhu, Xing-Quan] CAAS, Lanzhou Vet Res Inst, Key Lab Vet Parasitol Gansu Prov, State Key Lab Vet Etiol Biol, Lanzhou 730046, Gansu, Peoples R China.;[Yuan, Zi-Guo; Lin, Rui-Qing] S China Agr Univ, Coll Vet Med, Parasitol Lab, Guangzhou 510642, Guangdong, Peoples R China.;[Zhang, Kou-Xing] Sun Yat Sen Univ, Affiliated Hosp 3, Dept Infect Dis, Guangzhou 510630, Guangdong, Peoples R China.;[Li, Ming-Wei] Guangdong Ocean Univ, Coll Agr, Dept Vet Med, Zhanjiang 524088, Guangdong, Peoples R China.;[Liu, Wei; Liu, Yi; Liu, Guo-Hua] Hunan Agr Univ, Coll Vet Med, Parasitol Lab, Changsha 410128, Hunan, Peoples R China.
通讯机构:
[Zhu, Xing-Quan] C;CAAS, Lanzhou Vet Res Inst, Key Lab Vet Parasitol Gansu Prov, State Key Lab Vet Etiol Biol, Lanzhou 730046, Gansu, Peoples R China.
摘要:
Mitochondrial (mt) genome sequences provide useful markers for investigating population genetic structures, systematics and phylogenetics of organisms. Although Taenia multiceps, T. hydatigena, and T. taeniaeformis are common taeniid tapeworms of ruminants, pigs, dogs, or cats, causing significant economic losses, no published study on their mt genomes is available. The complete mt genomes of T. multiceps, T. hydatigena, and T. taeniaeformis were amplified in two overlapping fragments and then sequenced. The sizes of the entire mt genome were 13700 bp for T. multiceps, 13489 bp for T. hydatigena, and 13647 bp for T. taeniaeformis. Each of the three genomes contains 36 genes, consisting of 12 genes for proteins, 2 genes for rRNA, and 22 genes for tRNA, which are the same as the mt genomes of all other cestode species studied to date. All genes are transcribed in the same direction and have a nucleotide composition high in A and T. The contents of A+T of the complete genomes are 71.3% for T. multiceps, 70.8% for T. hydatigena, and 73.0% for T. taeniaeformis. The AT bias had a significant effect on both the codon usage pattern and amino acid composition of proteins. T. multiceps and T. hydatigena had two noncoding regions, but T. taeniaeformis had only one. Phylogenetic analyses based on concatenated amino acid sequences of 12 protein-coding genes revealed that T. multiceps, T. hydatigena, and T. taeniaeformis were more closely related to the other members of the Taenia genus, consistent with results of previous morphological and molecular studies. The present study determined the complete mt genome sequences for three Taenia species of animal and human health significance, providing useful markers for studying the systematics, population genetics, and molecular epidemiology of these cestode parasites of animals and humans.
摘要:
雄性特异性组织相容性抗原(male specific minor histompatibility antigens,H-Y抗原)是由Y染色体上的基因编码,在雄性动物细胞中普遍表达(包括胚胎和滋养层细胞)。H-Y抗原不仅能引起基因型相同的雌性动物排斥雄性组织,也能导致人白细胞抗原匹配干细胞移植术后出现移植抗宿主性疾病(GVH)。细胞毒性T淋巴细胞检测到几个不同的H-Y抗原表位,这些肽是从胞内蛋白分离出来,由主要组织相容性复合分子结合呈递在细胞表面。H-Y抗原肽与人白细胞抗原Ⅰ类和Ⅱ类分子特异结合参与免疫反应,从而影响移植结果。近年来越来越多的文献报道了H-Y抗原的相关研究,作者主要综述编码H-Y抗原的相关候选基因,并对它在疾病等方面的前景作出了一些展望。