Here, we present the complete mitochondrial (mt) genomes of four members of the Baicaliidae Fisher, 1885, a truncatelloidean family that is endemic to Lake Baikal (East Siberia). The mt genomes are those of Korotnewia korotnevi (15,171 bp), Godlewskia godlewskii (15,224 bp), Baicalia turriformis (15,127) and Maackia herderiana (15,154 bp). All these mt genomes contain 13 protein-coding genes, 2 ribosomal RNA (rRNA) genes and 22 transfer RNA (tRNA) genes. We detected non-canonical base pairs in some of the tRNA genes and variable numbers of non-coding spacers; some tRNAs do not have a TψC loop. We found gene order to be highly conserved in these Lake Baikal species and similar to the majority of caenogastropod mt genomes available on GenBank. A position of the putative control region is delimited to the non-coding region between trnF and the cox3 gene. It contains the ‘GAA(A)nT’ motif at the 3′ end and is similar to the replication origin found in most Caenogastropoda studied to date. We also compared the evolutionary rates of different genes to evaluate their use in different kinds of population or phylogenetic studies of this group of gastropods.

中文翻译：

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四个特有的贝加利科贝加尔软体动物的完整线粒体基因组（Caenogastropoda：Truncatelloida）

在这里，我们介绍了Baicaliidae Fisher，1885年，贝加尔湖（东西伯利亚）特有的truncatelloidean家族的四个成员的完整线粒体（mt）基因组。mt基因组的基因组是Korotnewia korotnevi（15,171 bp），Godlewskia godlewskii（15,224 bp），Baicalia turriformis（15,127）和Maackia herderiana（15,154 bp）。所有这些mt基因组均包含13个蛋白质编码基因，2个核糖体RNA（rRNA）基因和22个转移RNA（tRNA）基因。我们检测了一些tRNA基因中的非规范碱基对和可变数量的非编码间隔子。一些tRNA没有TψC环。我们发现在这些贝加尔湖物种中，基因顺序是高度保守的，与GenBank上的大多数caenogastropod mt基因组相似。假定控制区域的位置被限定为trnF和cox3之间的非编码区域基因。它在3'端包含'GAA（A）nT'模体，与迄今为止研究的大多数Caenogastropoda中发现的复制起点相似。我们还比较了不同基因的进化速率，以评估它们在这类腹足动物的不同种类种群或系统发育研究中的用途。