Complete Mitochondrial Genome of Pseudocaranx dentex (Carangidae, Perciformes) Provides Insight into Phylogenetic and Evolutionary Relationship among Carangidae Family

Abstract

Pseudocaranx dentex (white trevally) which belongs to the Carangidae family, is an important commercial fishery and aquaculture resource in Asia. However, its evolution and population genetics have received little attention which was limited by the mitogenome information absence. Here, we sequenced and annotated the complete mitochondrial genome of P. dentex which was 16,569 bp in length, containing twenty-two tRNAs (transfer RNAs), thirteen PCGs (protein-coding genes), two rRNAs (ribosomal RNAs), and one non-coding region with conservative gene arrangement. The Ka/Ks ratio analysis among Carangidae fishes indicated the PCGs were suffering purify selection and the values were related to the taxonomic status and further influenced by their living habits. Phylogenetic analysis based on the PCGs sequences of mitogenomes among 36 species presented three major clades in Carangidae. According to the phylogenetic tree, we further analyzed the taxonomic confusion of Carangoides equula which was on the same branch with P. dentex but a different branch with Carangoides spp. We inferred Kaiwarinus equula should be the accepted name and belong to the independent Kaiwarinus genus which was the sister genus of Pseudocaranx. This work provides mitochondrial genetic information and verifies the taxonomic status of P. dentex, and further helps to recognize the phylogenetic relationship and evolutionary history of Carangidae.

Comparative mitogenomics and phylogenetics of the family Carangidae with special emphasis on the mitogenome of the Indian Scad Decapterus russelli

“…3 ). This result confirms the findings of previous studies 44 , 76 and thus provides compelling evidence for the assignment of C. equula to its previously described genus, Kaiwarinus . The second lineage was the most taxonomically diverse group of the family Carangidae delineated in the present study as it consisted of 10 genera divided into two larger groups.…”

Comparative Mitogenomics of Two Sympatric Catfishes of Exostoma (Siluriformes: Sisoridae) from the Lower Yarlung Tsangpo River and Its Application for Phylogenetic Consideration

“…The separate ω values for the three Exostoma species yielded from the branch model in the codeml program showed that the ω values of the 13 PCGs , as well as the concatenated genes, were all less than 1, ranging from 0.0001 ( COX2 of Exostoma tibetanum and Exostoma tenuicaudatum ) to 0.5699 ( ATP8 of Exostoma gaoligongense ) ( Figure 6 , see Table S4 for details). This phenomenon of general purifying selection of PCGs was consistent with the signature of strong functional constraints of mitochondria as the main energy production center in eukaryotes, which could eliminate deleterious mutations to prevent the decrease in fitness, and was usually detected in other teleosts [ 45 , 46 , 47 ]. To be specific, the ATP8 gene exhibited the highest ω value, similar to other eukaryotic organisms [ 48 , 49 , 50 ].…”