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A molecular phylogeny of the genus Echinococcus inferred from complete mitochondrial genomes.

机译：从完整的线粒体基因组推断出棘球E属的分子系统发育。

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摘要

Taxonomic revision by molecular phylogeny is needed to categorize members of the genus Echinococcus (Cestoda: Taeniidae). We have reconstructed the phylogenetic relationships of E. oligarthrus, E. vogeli, E. multilocularis, E. shiquicus, E. equinus, E. ortleppi, E. granulosus sensu stricto and 3 genotypes of E. granulosus sensu lato (G6, G7 and G8) from their complete mitochondrial genomes. Maximum likelihood and partitioned Bayesian analyses using concatenated data sets of nucleotide and amino acid sequences depicted phylogenetic trees with the same topology. The 3 E. granulosus genotypes corresponding to the camel, pig, and cervid strains were monophyletic, and their high level of genetic similarity supported taxonomic species unification of these genotypes into E. canadensis. Sister species relationships were confirmed between E. ortleppi and E. canadensis, and between E. multilocularis and E. shiquicus, regardless of the analytical approach employed. The basal positions of the phylogenetic tree were occupied by the neotropical endemic species, E. oligarthrus and E. vogeli, whose definitive hosts are derived from carnivores that immigrated from North America after the formation of the Panamanian land bridge. Host-parasite co-evolution comparisons suggest that the ancestral homeland of Echinococcus was North America or Asia, depending on whether the ancestral definitive hosts were canids or felids.
机译：需要通过分子系统发育分类进行分类，以对棘球E属（Cestoda：Taeniidae）的成员进行分类。我们已经重建了寡食肠杆菌，伏格利肠杆菌，多裂肠埃希氏菌，shiquicus大肠杆菌，e。equinus，E。ortleppi，E。granulosus sensu stricto和3种基因型的E. granulosus sensu lato（G6，G7和G8）从他们完整的线粒体基因组。使用核苷酸和氨基酸序列的级联数据集的最大似然和分区贝叶斯分析描绘了具有相同拓扑的系统发育树。对应于骆驼，猪和子宫颈菌株的3种颗粒肠球菌（E. granulosus）基因型是单系的，它们的高遗传相似性支持将这些基因型的分类学物种统一为加拿大E. canadensis。不论采用何种分析方法，都确认了大肠埃希氏菌与加拿大大肠埃希菌之间，多叶埃希氏菌与Shiquicus埃希氏菌之间的姊妹物种关系。系统发育树的基础位置被新热带特有物种E. oligarthrus和E. vogeli占据，它们的确定宿主来自于巴拿马陆桥形成后从北美移民的食肉动物。寄主与寄生虫共同进化的比较表明，棘球E的祖国是北美还是亚洲，这取决于祖先确定的寄主是犬科动物还是猫科动物。

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