Abstract
In this study, we have determined the complete nucleotide sequence of the mitochondrial genome of Octopus minor. It is 15,974 nucleotide pairs and encodes 13 proteins, two ribosomal RNAs and 22 tRNAs of the mitochondrion’s own protein synthesizing system. Seven of thirteen proteins are encoded by the H-strand, while the other six proteins, as well as the two ribosomal RNAs are encoded by the L-strand. The nucleotide composition of the proteins showed a nucleotide bias against G encoded by the H-strand, while they showed a nucleotide bias against A and C encoded by the L-strand. Two of the 13 protein coding genes of O. minor began with the unorthodox translation initiation codon ATA and all others use the standard ATG. In addition, six of thirteen mt proteins of O. minor have unambiguous termination codons. There are four cases where tRNA genes appear to overlap. The long noncoding region (LNCR) of O. minor was 930 nucleotides and no repeated sequences were found in this LNCR. The gene arrangements of O. minor showed remarkable similarity to that of O. ocellatus and O. vulgaris. Phylogenetic analysis demonstrated that O. minor appears as sister taxan to the monophyletic group combined by O. ocellatus and O. vulgaris, suggesting a relative distant genetic relationship between O. minor and the other two octopus species.
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Acknowledgments
This study was supported by National High Technology Research and Development Program of China (863Program) (no. 2007AA09Z433) and the National Marine Public Welfare Research Project (no. 200805069). We thank Dr. Hong Yu (Ocean University of China) for providing some reasonable advice on the manuscript. We would also like to thank Mr. Yaosen Qian (Ocean University of China) for providing us with the samples.
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Rubin Cheng, Xiaodong Zheng contributed equally to this study.
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Cheng, R., Zheng, X., Lin, X. et al. Determination of the complete mitochondrial DNA sequence of Octopus minor . Mol Biol Rep 39, 3461–3470 (2012). https://doi.org/10.1007/s11033-011-1118-2
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DOI: https://doi.org/10.1007/s11033-011-1118-2