Yang Dong, Zhang Tiemin, Zeng Zhaolin, Zhao Wei, Zhang Weizhe, Liu Aiqin
Department of Parasitology, Harbin Medical University, Harbin, Heilongjiang 150081, China.
Department of General Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, China.
Parasitol Int. 2015 Oct;64(5):330-3. doi: 10.1016/j.parint.2015.05.001. Epub 2015 May 9.
Cystic echinococcosis (CE) is one of the most important parasitic zoonoses. 10 distinct genotypes, designated G1-G10 genotypes of Echinococcus granulosus sensu lato (s.l.), have been split into 4 species: Echinococcus granulosus sensu stricto (s.s.) (G1-G3), Echinococcus equinus (G4), Echinococcus ortleppi (G5) and Echinococcus canadensis (G6-G10); Echinococcus felidis has also been suggested as a sister taxon of E. granulosus s.s. recently. Four genotypes belonging to two species (G1 and G3 genotypes of E. granulosus s.s., and G6 and G7 genotypes of E. canadensis) have been identified in humans and animals in China. In the present study, a human-derived hydatid cyst from a patient in northeastern China's Heilongjiang Province was identified as G10 genotype of E. canadensis based on mitochondrial cytochrome c oxidase subunit I (cox1), cytochrome b (cytb) and NADH dehydrogenase subunit 1 (nad1) genes. Homology analysis showed the cox1 gene sequence of G10 genotype of E. canadensis had 100% homology with those from wolves in Mongolia and from a moose in Russia. The cytb and nad1 gene sequences of G10 genotype of E. canadensis had 100% homology with the complete sequence from a moose in Finland at an amino acid level. The infection source of the CE patient here might be primarily attributable to wolves. This is the first report of G10 genotype of E. canadensis in a human in China. The finding of G10 genotype of E. canadensis in China shows that this genotype possibly has a more wide geographical distribution than previously considered.
囊型包虫病(CE)是最重要的寄生虫人畜共患病之一。细粒棘球绦虫复合种(s.l.)的10个不同基因型,即G1 - G10基因型,已被划分为4个种:狭义细粒棘球绦虫(s.s.)(G1 - G3)、马细粒棘球绦虫(G4)、奥氏细粒棘球绦虫(G5)和加拿大细粒棘球绦虫(G6 - G10);最近也有人提出猫细粒棘球绦虫是狭义细粒棘球绦虫的姐妹分类单元。在中国的人和动物中已鉴定出属于两个种的4个基因型(狭义细粒棘球绦虫的G1和G3基因型,以及加拿大细粒棘球绦虫的G6和G7基因型)。在本研究中,根据线粒体细胞色素c氧化酶亚基I(cox1)、细胞色素b(cytb)和NADH脱氢酶亚基1(nad1)基因,将来自中国东北黑龙江省一名患者的人源包虫囊肿鉴定为加拿大细粒棘球绦虫的G10基因型。同源性分析表明,加拿大细粒棘球绦虫G10基因型的cox1基因序列与蒙古狼和俄罗斯驼鹿的cox1基因序列具有100%的同源性。加拿大细粒棘球绦虫G10基因型的cytb和nad1基因序列在氨基酸水平上与芬兰一头驼鹿的完整序列具有100%的同源性。此处CE患者的感染源可能主要归因于狼。这是中国首次报道加拿大细粒棘球绦虫G10基因型在人体中的感染。在中国发现加拿大细粒棘球绦虫G10基因型表明,该基因型可能具有比先前认为的更广泛的地理分布。