Gene rearrangements in the mitochondrial genome of Cynoglossus bilineatus (Pleuronectiformes: Cynoglossidae)

Abstract

Cynoglossus bilineatus (Cynoglossidae, Soleoidei) is characterized by both eyes on the left side of the body and with a rounded snout and a short rostral hook. Here we first report the mitogenome of this tongue sole, which is 16,454 bp in length, and gene rearrangements have been observed. Particularly, the tRNA-Gln gene encoded by the light strand (L-strand) has translocated to the heavy strand (H-strand), along with the tRNA-Ile gene shuffling. In addition, the putative control region has translocated downstream to a position between the ND1 and tRNA-Gln genes, leaving a 26-bp intergenic spacer in its original position. However, the arrangement of the rest genes is identical to that of the typical teleost. This result could contribute to a better understanding the molecular mechanisms of gene rearrangement in fish mitogenome as well as phylogenetic study of Cynoglossidae and Pleuronectiformes.

• Flatfish
• Fourlined tonguesole
• gene rearrangement
• inversion

Declaration of interest

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper. This study was supported by the National Natural Science Foundation of China (31071890).