The Key Laboratory of Marine Fishery Molecular Biology of Liaoning Province, Liaoning Ocean and Fisheries Science Research Institute, 50 Heishijiao Street, Dalian 116023, China.
Mol Biol Rep. 2011 Jun;38(5):3401-9. doi: 10.1007/s11033-010-0449-8. Epub 2010 Nov 18.
Veneridae is a diverse, commercially important, and cosmopolitan family. Here we present the complete mitochondrial genome of the hard clam Meretrix meretrix (Bivalvia: Veneridae). The entire mitochondrial genome (mitogenome) sequence of M. meretrix is 19,826 bp in length, and contains 37 genes including 12 protein-coding genes, 2 ribosomal RNAs, and 23 tRNAs. All genes are encoded on the heavy strand. In contrast to the typical animal mitochondrial genome, it lacks the protein-coding gene ATP8, and has only one copy of the tRNA(Ser) gene, but three duplications of the tRNA(Gln), which is the first report among the present molluscan mtDNAs. We observed that the gene arrangement between M. meretrix and M. petechialis is same except one more tRNAGln gene in M. meretrix., and the sequence similarity is as high as 99%, indicating that M. petechialis and M. meretrix could be treated as a junior synonym of M. meretrix. Maximum Likelihood and Bayeslan analysis of 12 concatenated protein-coding amino acid sequences place the Unionidae as a sister group to other bivalves, which reflects the general opinion that the Unionidae deverged very early in Bivalvia evolution.
帘蛤科是一个多样化的、具有商业重要性的世界性家族。本文呈现了中国蛤蜊（Meretrix meretrix）（双壳纲：帘蛤科）完整的线粒体基因组。M. meretrix 的整个线粒体基因组（mitogenome）序列长 19826bp，包含 37 个基因，包括 12 个蛋白编码基因、2 个核糖体 RNA 和 23 个 tRNA。所有基因都编码在重链上。与典型的动物线粒体基因组不同，它缺乏蛋白编码基因 ATP8，并且只有一个 tRNA(Ser)基因的副本，但有三个 tRNA(Gln)的重复，这是目前软体动物 mtDNA 中的首次报道。我们观察到，M. meretrix 和 M. petechialis 之间的基因排列相同，除了 M. meretrix 中有一个额外的 tRNAGln 基因，两者的序列相似度高达 99%，这表明 M. petechialis 和 M. meretrix 可以被视为 M. meretrix 的同物异名。12 个串联蛋白编码氨基酸序列的最大似然和贝叶斯分析将贻贝科作为其他双壳类的姐妹群，这反映了贻贝科在双壳类进化中很早就分化出来的普遍观点。
