Complete sequence determination and analysis of mitochondrial genome in Oreonectes daqikongensis

Oreonectes daqikongensi revealed that the complete length of its mitochondrial genome was 16,578 bp, composed of A (30.7%), T (25.6%), G (16.2%), C (27.5%) and A + T (56.3%). Its genetic constitution and arrangement were consistent with those of other Osteichthyes, including 13 protein-coding genes, 22 tRNA genes, 2 rRNA genes, and 1 control area (D-loop). All genes were encoded by the H-strand, except for 1 protein-coding gene (ND6) and 8 tRNA genes (tRNA-Gln, tRNA-Ala, tRNA-Cys, tRNA-Asn, tRNA-Tyr, tRNA-Ser, tRNA-Glu and tRNA-Pro) are encoded by the L-strand. The mitochondrial genes were arranged very closely. There were four gene overlapping regions, with an overall length of 21 bp and a base covering number range of 1–14 bp, and 23 intergenic regions, with an overall length of 147 bp and an intergenic length range of 1–19 bp. There were 10 gene pairs that were neither overlapping nor intergenic.