Complete nucleotide sequences of mitochondrial genomes of two solitary entoprocts, Loxocorone allax and Loxosomella aloxiata: implications for lophotrochozoan phylogeny.
Complete nucleotide sequences of mitochondrial genomes of two solitary entoprocts, Loxocorone allax and Loxosomella aloxiata: implications for lophotrochozoan phylogeny.
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DOI：
10.1016/j.ympev.2008.02.013
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发表时间：
2008-05
影响因子：
4.1
通讯作者：
S. Yokobori;T. Iseto;S. Asakawa;Takashi Sasaki;N. Shimizu;A. Yamagishi;T. Oshima;E. Hirose
中科院分区：
文献类型：
--
作者：
S. Yokobori;T. Iseto;S. Asakawa;Takashi Sasaki;N. Shimizu;A. Yamagishi;T. Oshima;E. Hirose
测定了内直肠吸虫Loxocorone allax和Loxosomella aloxiata的线粒体(Mt)基因组全序列。这两个物种携带典型的后生动物mt基因组的基因集，并具有相似的mt基因组织。然而，它们在两个tRNALeugene的位置上表现出差异。此外，tRNAValgene和一半的长非编码区在Loxos中复制和颠倒。Aloxiata Mt基因组。Loxos的起始密码子。Aloxiata细胞色素氧化酶I亚基基因预计为ACG，而不是AUG。这两种内直肠动物的mt基因组织与软体动物如衣锦蛇和章鱼的mt基因组织最相似，这两种软体动物的mt基因组织在进化上是迄今为止报道的最保守的。对钩足动物门(环节动物纲、腕足纲、Echiura纲、内直门、软体动物纲、Nmertea和Phoronida)的mt基因组织分析表明，腕足纲、环节动物纲和Echiura纲之间存在密切的系统发育关系。然而，Phoronida被排除在这一组之外。基于mt蛋白编码基因序列的分子系统发育分析表明，内直肠目和棘足目之间可能有较近的亲缘关系，腕足目、环节动物和Echiura之间也有较近的亲缘关系。
The complete nucleotide sequences of the mitochondrial (mt) genomes of the entoprocts Loxocorone allax and Loxosomella aloxiata were determined. Both species carry the typical gene set of metazoan mt genomes and have similar organizations of their mt genes. However, they show differences in the positions of two tRNALeugenes. Additionally, the tRNAValgene, and half of the long non-coding region, is duplicated and inverted in the Loxos. aloxiata mt genome. The initiation codon of the Loxos. aloxiata cytochrome oxidase subunit I gene is expected to be ACG rather than AUG. The mt gene organizations in these two entoproct species most closely resemble those of mollusks such as Katharina tunicata and Octopus vulgaris, which have the most evolutionarily conserved mt gene organization reported to date in mollusks. Analyses of the mt gene organization in the lophotrochozoan phyla (Annelida, Brachiopoda, Echiura, Entoprocta, Mollusca, Nemertea, and Phoronida) suggested a close phylogenetic relationship between Brachiopoda, Annelida, and Echiura. However, Phoronida was excluded from this grouping. Molecular phylogenetic analyses based on the sequences of mt protein-coding genes suggested a possible close relationship between Entoprocta and Phoronida, and a close relationship among Brachiopoda, Annelida, and Echiura.