Abstract
The complete mitochondrial genome (mt-genome) sequence of Fulvia mutica (Veneroida; Cardiidae) was determined. The genome is 19,110 bp in size and contains 42 genes, including the ATP synthase subunit 8 gene (atp8). All genes are on the same strand, as in other marine bivalves. It is extremely different in gene arrangement and size from that of Acanthocardia tuberculata, the only species belonging to Cardiidae with complete genome sequence data. The presence of putative atp8 genes in two additional reported bivalve species, A. tuberculata and Sinonovacula constricta was also inferred by revising their deposited sequence data. It was suggested that atp8 genes of heterodont bivalves could be translated to 37–39 amino acid sequences highly conserved within families, excluding Hiatella arctica with 53 amino acids. The mt-genome of F. mutica also contains two large duplicated regions related to different sequence motifs. One of the regions consists of five nearly identical copies of the 154 bp motif that includes a transfer RNA gene for cysteine. This region exhibited polymorphism in the number of repeats among individuals, suggesting the existence of a variable number of tandem repeats, which was expected to provide valuable information for developing useful genetic markers for phylogenetic study and population genetics.
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Acknowledgments
The authors are grateful to Professor Futoshi Aranishi, Shimane University and Dr.Takanori Kobayashi, Fisheries Research Agency, for their technical advice and also to Dr. Enrique Blanco Gonzalez for reviewing the manuscript.
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Imanishi, Y., Tanaka, M. & Fujiwara, M. Complete mitochondrial genome sequence of Japanese cockle Fulvia mutica (Cardiidae). Fish Sci 79, 949–957 (2013). https://doi.org/10.1007/s12562-013-0662-1
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DOI: https://doi.org/10.1007/s12562-013-0662-1