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Unusual mitochondrial genome structure of the freshwater goby Odontobutis platycephala: rearrangement of tRNAs and an additional non-coding region

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Mitochondrial DNA was isolated from the Korean freshwater gobioid fish Odontobutis platycephala by long-polymerase chain reaction with conserved primers and this mtDNA was sequenced by primer walking using flanking sequences as sequencing primers. The resultant O. platycephala mtDNA sequence was found to be 17 588 bp in size with a mostly conserved structural organization when compared with that of other teleost fish. Rearrangements of tRNAs (tRNA-Ser, tRNA-Leu, tRNA-His) and an additional non-coding region (533 bp) were present between the ND4 and ND5 genes. In the present paper, the basic characteristics of the O. platycephala mitochondrial genome is reported, including its structural organization, base composition of rRNAs, tRNAs and protein-encoding genes, characteristics of mitochondrial tRNAs and the peculiar rearrangement features of some parts of the mtDNA. Phylogenetic analysis performed using the cytochrome b gene sequences of 16 Korean freshwater fishes (15 gobioids) with the Bayesian algorithm showed that O. platycephala forms a clade (1ยท00 of posterior probability) with other species of Odontobutis. This suggests that the observed rearrangement between the ND4 and ND5 genes in the O. platycephala mitogenome reflects independent events.
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Keywords: Odontobutis platycephala; goby; long-polymerase chain reaction; mitochondrial genome; sequencing; teleost fish

Document Type: Regular Paper

Affiliations: Department of Molecular and Environmental Bioscience, Graduate School, Hanyang University, Seoul 133-791, Korea

Publication date: 01 August 2008

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