Gene rearrangements in the mitochondrial genome of robust tonguefish, Cynoglossus robustus (Pleuronectiformes: Cynoglossidae) and a comparative analysis with other Cynoglossus fishes

Abstract

The complete mitochondrial genome was determined for the Robust tonguefish Cynoglossus robustus belonging to the family Cynoglossidae. The length of the complete mitochondrial genome is 16,720 bp, consisting of 13 protein-coding genes, 22 tRNA genes, two rRNA genes, and a control region. Rearrangements of the tRNA Gln and a control region gene were found and tRNA Gln is translocated from the light to the heavy strand. Phylogenetic analysis using mitochondrial genomes of 12 species showed that C. robustus formed a well-supported monophyletic group with other Cynoglossus species.

Novel Gene Rearrangement and the Complete Mitochondrial Genome of Cynoglossus monopus: Insights into the Envolution of the Family Cynoglossidae (Pleuronectiformes)

“…The tRNA-Gln gene was inverted from the L-strand position to the H-strand in the other position. This result is consistent with the findings of previous studies where species in subfamily Cynoglossinae have been found to have large-scale gene rearrangements, and a unique gene order, CR-Gln-Ile-Met, which is different from the typical gene order of CR-Phe-12S-Val-16S-Leu1-ND1-Gln-Ile-Met [19][20][21][22][23][24][25][26][27]. The overall base composition is 30.80% A, 24.04% C, 14.77% G, and 30.39% T, with a high AT content (61.19%).…”

Characterization of the complete mitochondrial genome of Cynoglossus nanhaiensis (Pleuronectiformes: Cynoglossidae)

“… 2016 ; Song et al. 2019 ) that Paraplagusia was a new clade which occurred later than Cynoglossus . Moreover, the Paraplagusia clade has a close phylogenetic relationship with C. puncticeps .…”