The Complete Mitochondrial Genome and Gene Arrangement of the Enigmatic Scaphopod Pictodentalium vernedei.
The Complete Mitochondrial Genome and Gene Arrangement of the Enigmatic Scaphopod Pictodentalium vernedei.
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神秘的舟足类，或象牙贝壳，是一个小而罕见的软体动物群体，其在贝壳类中的基因组位置尚未确定，本纲的分类也需要修订。这类工作受到阻碍，因为目前在这一组中只有很少的线粒体基因组可用。本研究组装并注释了花齿鱼（Dentaliida Pictodentalium vernedei）的线粒体全基因组，其线粒体基因组大小为14，519 bp，包含13个蛋白质编码基因、22个tRNA基因和2个rRNA基因。核苷酸组成偏向A-T，AT含量占71.91%。基于有丝分裂基因组的系统发育分析，我们将P. vernedei定义为笔石藻的姐妹。虽然发生了一些重新安排，线粒体基因顺序显示出深度的保护内齿目。然而，这样的基因顺序在Dentaliida在很大程度上偏离Gadilida和其他软体动物类，这表明舟足类有丝分裂基因组排列的程度最高的其他软体动物相比。
The enigmatic scaphopods, or tusk shells, are a small and rare group of molluscs whose phylogenomic position among the Conchifera is undetermined, and the taxonomy within this class also needs revision. Such work is hindered by there only being a very few mitochondrial genomes in this group that are currently available. Here, we present the assembly and annotation of the complete mitochondrial genome from Dentaliida Pictodentalium vernedei, whose mitochondrial genome is 14,519 bp in size, containing 13 protein-coding genes, 22 tRNA genes and two rRNA genes. The nucleotide composition was skewed toward A-T, with a 71.91% proportion of AT content. Due to the mitogenome-based phylogenetic analysis, we defined P. vernedei as a sister to Graptacme eborea in Dentaliida. Although a few re-arrangements occurred, the mitochondrial gene order showed deep conservation within Dentaliida. Yet, such a gene order in Dentaliida largely diverges from Gadilida and other molluscan classes, suggesting that scaphopods have the highest degree of mitogenome arrangement compared to other molluscs.
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