Insights into the phylogenetic relationships and drug targets of Babesia isolates infective to small ruminants from the mitochondrial genomes

文献类型： 外文期刊

第一作者： Wang, Xiaoxing

作者： Wang, Xiaoxing;Wang, Jinming;Liu, Junlong;Liu, Aihong;He, Xin;Xiang, Quanjia;Li, Youquan;Yin, Hong;Luo, Jianxun;Guan, Guiquan;Yin, Hong

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关键词： Babesia motasi; Babesia sp; Cytochrome bc1 complex; Drug target; Mitochondrial genome; Phylogenetic relationship

期刊名称：PARASITES & VECTORS （ 影响因子：3.876； 五年影响因子：3.959 ）

ISSN： 1756-3305

年卷期： 2020 年 13 卷 1 期

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收录情况： SCI

摘要： BackgroundBabesiosis, a tick-borne disease caused by protozoans of the genus Babesia, is widespread in subtropical and tropical countries. Mitochondria are essential organelles that are responsible for energy transduction and metabolism, calcium homeostasis and cell signaling. Mitochondrial genomes could provide new insights to help elucidate and investigate the biological features, genetic evolution and classification of the protozoans. Nevertheless, there are limited data on the mitochondrial genomes of ovine Babesia spp. in China.MethodsHerein, we sequenced, assembled and annotated the mitochondrial genomes of six ovine Babesia isolates; analyzed the genome size, gene content, genome structure and cytochrome b (cytb) amino acid sequences and performed comparative mitochondrial genomics and phylogenomic analyses among apicomplexan parasites.ResultsThe mitochondrial genomes range from 5767 to 5946 bp in length with a linear form and contain three protein-encoding genes, cytochrome c oxidase subunit 1 (cox1), cytochrome c oxidase subunit 3 (cox3) and cytb, six large subunit rRNA genes (LSU) and two terminal inverted repeats (TIR) on both ends. The cytb gene sequence analysis indicated the binding site of anti-Babesia drugs that targeted the cytochrome bc1 complex. Babesia microti and Babesia rodhaini have a dual flip-flop inversion of 184-1082 bp, whereas other Babesia spp. and Theileria spp. have one pair of TIRs, 25-1563 bp. Phylogenetic analysis indicated that the six ovine Babesia isolates were divided into two clades, Babesia sp. and Babesia motasi. Babesia motasi isolates were further separated into two small clades (B. motasi Hebei/Ningxian and B. motasi Tianzhu/Lintan).ConclusionsThe data provided new insights into the taxonomic relationships and drug targets of apicomplexan parasites.

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