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首页> 外文期刊>Parasitology >First comparative insight into the architecture of COI mitochondrial minicircle molecules of dicyemids reveals marked inter-species variation
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First comparative insight into the architecture of COI mitochondrial minicircle molecules of dicyemids reveals marked inter-species variation

机译：对双孔菌的COI线粒体微圆分子结构的第一个比较见解揭示了明显的种间变异

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摘要

Dicyemids, poorly known parasites of benthic cephalopods, are one of the few phyla in which mitochondrial (mt) genome architecture departs from the typical similar to 16 kb circular metazoan genome. In addition to a putative circular genome, a series of mt minicircles that each comprises the mt encoded units (I-III) of the cytochrome c oxidase complex have been reported. Whether the structure of the mt minicircles is a consistent feature among dicyemid species is unknown. Here we analyse the complete cytochrome c oxidase subunit I (COI) minicircle molecule, containing the COI gene and an associated non-coding region (NCR), for ten dicyemid species, allowing for first time comparisons between species of minicircle architecture, NCR function and inferences of minicircle replication. Divergence in COI nucleotide sequences between dicyemid species was high (average net divergence = 31.6%) while within species diversity was lower (average net divergence = 0.2%). The NCR and putative 5' section of the COI gene were highly divergent between dicyemid species (average net nucleotide divergence of putative 5' COI section = 61.1%). No tRNA genes were found in the NCR, although palindrome sequences with the potential to form stem-loop structures were identified in some species, which may play a role in transcription or other biological processes.
机译：Dicyemids是底栖头足类的鲜为人知的寄生虫，是线粒体（mt）基因组结构不同于典型的类似于16 kb环状后生动物基因组的少数门系之一。除假定的环状基因组外，还报道了一系列mt微型圆，每个微型圆包含细胞色素c氧化酶复合物的mt编码单元（I-III）。 mt微型圆的结构是否在双麦草种之间是一致的特征尚不清楚。在这里，我们分析了完整的细胞色素C氧化酶亚基I（COI）小圆圈分子，其中包含COI基因和一个相关的非编码区（NCR），用于十个二甲酰胺类物种，从而首次进行了微环结构物种，NCR功能和小圆复制的推论。双麦草种之间的COI核苷酸序列差异较高（平均净差异= 31.6％），而物种内部差异较低（平均净差异= 0.2％）。在双麦草种之间，COI基因的NCR和推定的5'区段差异很大（推定的5'COI区段的平均净核苷酸差异= 61.1％）。尽管在某些物种中鉴定出具有形成茎环结构潜力的回文序列，但在NCR中未发现tRNA基因，这可能在转录或其他生物过程中起作用。

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