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The complete mitochondrial genome of Cynoglossus interruptus and its novel rearrangement (Pleuronectiformes: Cynoglossidae).

ABSTRACT: The complete mitochondrial genome was determined for the Cynoglossus interruptus belonging to the family Cynoglossidae. The length of the complete mitochondrial genome is 17,262 bp, consisting of 13 protein-coding genes, 22 tRNA genes, two rRNA genes, and a control region. The gene rearrangement related to tRNA^Gln and a control region gene were found, forming the gene order of CR-Ile-Gln-Met. Phylogenetic analysis using mitochondrial genomes of 12 species showed that C. interruptus formed a well-supported monophyletic group with other Cynoglossus species.

SUBMITTER: Song HY

PROVIDER: S-EPMC7706794 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:The mitochondrial genomes (mitogenomes) of flatfishes (Pleuronectiformes) exhibit highly diversified types of large-scale gene rearrangements. We have reported that the mitogenomes of Crossorhombus azureus (Bothidae), Samariscus latus (Samaridae) and Cynoglossus fishes (Cynoglossidae) show different types of gene rearrangements.In the present study, the complete mitogenomes of two Symphurus species (Cynoglossidae), Symphurus plagiusa and Symphurus orientalis, were determined. The gene order in the S. plagiusa mitogenome is the same as that of a typical vertebrate (without any gene rearrangements). Surprisingly, large-scale gene rearrangements have occurred in S. orientalis. In the rearranged fragment from the control region (CR) to the WANCY tRNA cluster (tRNA cluster of tRNA-W, tRNA-A, tRNA-N, tRNA-C and tRNA-Y) in the S. orientalis mitogenome, tRNA-V and tRNA-M have been translocated to the 3' end of the 16S rRNA gene, with six large intergenic spacers over 20 bp in length. In addition, an origin for light-strand replication (OL) structure that is typically located in the WANCY region was absent in both the S. plagiusa and S. orientalis mitogenomes. It is generally recognized that a sequence in the WANCY region that encodes tRNAs forms a hairpin structure (OL-like structure) and can act as the OL when the typical locus is lost. Moreover, an additional OL-like structure was identified near the control region in the S. plagiusa mitogenome.The positions of the intergenic spacers and the rearranged genes of the S. orientalis mitogenome strongly indicate that the mechanism underlying the rearrangement of this mitogenome was Tandem Duplication and Random Loss. Additionally, two OL-like regions substituting for the typical locus were found in the S. plagiusa mitogenome. We speculate that the ancestral mitogenomes of S. plagiusa and S. orientalis also had this characteristic, such that if both OL-like structures functioned during mitochondrial replication, they could initiate duplicate replications of the light strand (L-strand), leading to duplication of the region between the two structures. We consider that this mechanism may account for the gene duplication that occurred during the gene rearrangement process in the evolution of the ancestral mitogenome to the S. orientalis mitogenome.

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The complete mitochondrial genome of Cynoglossus interruptus and its novel rearrangement (Pleuronectiformes: Cynoglossidae).

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