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首页> 外文期刊>Molecular phylogenetics and evolution >Conservation and variation in mitochondrial genomes of gastropods Oncomelania hupensis and Tricula hortensis, intermediate host snails of Schistosoma in China
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Conservation and variation in mitochondrial genomes of gastropods Oncomelania hupensis and Tricula hortensis, intermediate host snails of Schistosoma in China

机译：中国血吸虫中间寄主蜗牛腹足纲小钉螺和短吻线虫线粒体基因组的保守和变异

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摘要

The complete mitochondrial genomes of intermediate host snails for Schistosoma in China were sequenced, including the sub-species Oncomelania hupensis hupensis in two types, and O. hupensis robertsoni, intermediate hosts for S. japonicum, and Tricula hortensis, the intermediate host of S. sinensium. Four genomes have completely the same gene order as in other caenogastropods, containing 13 protein-coding genes and 22 transfer RNAs. The gene size, start codon and termination codon are mostly the same for all protein-coding genes. However, pairwise sequence alignments revealed quite different degrees of variation. The ribbed-shelled O. hupensis hupensis and the smooth-shelled but with varix O. hupensis hupensis had a lower level of genetic distance (3.1% for protein-coding genes), but the coden usages differed obviously in the mitochondrial genomes of these two types of snails, implying that their genetic difference may be larger than previously recognized. The mean genetic distance between O. hupensis hupensis and O. hupensis robertsoni was 12% for protein-coding genes, indicating a higher degree of genetic difference. In consideration of the difference in morphology and distribution, we considered that O. hupensis hupensis and O. hupensis robertsoni can be considered as separate species. The ribbed-shelled O. hupensis hupensis and smooth-shelled O. hupensis robertsoni were phylogenetically clustered together within a same clade, which was then clustered with T. hortensis, confirming their close relationship. However, species or sub-species in the Oncomelania from southeastern Asian countries should be included in future study in order to resolve the phylogenetic relationship and origination of all snails in the genus.
机译：对中国血吸虫中间宿主蜗牛的完整线粒体基因组进行了测序，包括两种亚种：钉螺亚种（Oncomelania hupensis hupensis），以及日本血吸虫的中间宿主O. hupensis robertsoni和S.的中间宿主Tricula hoortensis。 ens四个基因组具有与其他腹足类动物完全相同的基因顺序，包含13个蛋白质编码基因和22个转移RNA。所有蛋白质编码基因的基因大小，起始密码子和终止密码子几乎相同。然而，成对的序列比对揭示了完全不同的变异程度。带肋壳的欧苏木和光滑的但具有变异性的欧苏木具有较低的遗传距离水平（蛋白质编码基因为3.1％），但是在这两个线粒体基因组中，编码方式的使用明显不同种类的蜗牛，这意味着它们的遗传差异可能比以前公认的大。对于蛋白质编码基因，苏云金芽孢杆菌和罗伯特瓦氏梭菌之间的平均遗传距离为12％，表明遗传差异程度更高。考虑到形态和分布上的差异，我们认为湖O和湖ro可以被视为单独的物种。将带肋壳的壳锦葵和光滑壳锦葵在系统发育上聚在一起，然后与霍氏锥团聚在一起，证实了它们的密切关系。然而，在未来的研究中应包括来自东南亚国家的钉螺物种或亚种，以便解决该属中所有蜗牛的系统发育关系和起源。

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