Complete mitochondrial genome of Acrossocheilus parallens (Cypriniformes, Barbinae)

The complete mitochondrial genome of Neolissochilus soroides (Duncker, 1904) (Cypriniformes: Cyprinidae)

In this paper, we first report the complete mitochondrial genome of Neolissochilus soroides. The main purpose of this study was to determine the mitochondrial genome and phylogenetic status of N. soroides. The length mitogenome was 16584 bp, containing 2 ribosomal RNA genes, 13 protein-coding genes, 22 transfer RNA genes, and 3 non-coding control regions. The genome showed a slight A + T bias (A + T = 56.47%). 12 genes (ND1, COX2, ATP6, ND4L, ND5, ND6, ND2, ATP8, ND3, ND4, Cytb, COX3) start with ATG codon, besides one gene (COX1) start with GTG codon. Six genes (ND1, COX1, ATP6, ND4L, ND5, ND6) end with a TAA codon, 3 genes (ND2, ATP8, ND3) end with a TAG codon, and four genes (COX2, ND4, Cytb, COX3) end with the TA or T codon. The phylogenetic analysis showed that N. soroides was closely related to N. hendersoni. The mitogenome could have important implications for phylogeny, population genetics, and conservation of the N. soroides.

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

Carangids are abundant and commercially important marine fish that contribute to a significant portion of the fisheries in many parts of the world. In the present study, we characterized the complete mitogenome of the Indian scad, Decapterus russelli and performed a comprehensive comparative mitogenomic analysis of the family Carangidae. The comparative mitogenomics provided valuable insights into the structure, variability, and features of the coding and non-coding regions that evolved across species over millions of years. The structural features of tRNAs revealed changes in the frequency of mismatched and wobble base pairs, which is reflected in the base composition of H and L strands. The highly conserved sequence motif of the mTERF binding site in carangids over the ~ 400 MYA of their divergence demonstrated the functional importance of these sites. The control region of carangids was characterized by the presence of discontinuous repeat units with a high rate of sequence divergence in the form of base substitutions, insertions, and deletions. The maintenance of secondary structures in the control region independent of the rapid evolution of primary structure suggested the effect of selective constraints on their maintenance. Maximum likelihood (ML) and Bayesian inference (BI) phylogeny revealed a similar topology consistent with previous taxonomic studies. The extant carangids diverged through the evolutionary events experienced during the Cretaceous, Paleogene, and Neogene periods.

The complete mitochondrial genome of Acrossocheilus wenchowensis (Cyprinidae, Barbinae) from Xinanjiang River

The complete mt genome sequence of Acrossocheilus wenchowensis was obtained by PCR, containing 37 genes with 13 protein coding genes, 22 transfer RNAs (tRNAs), two ribosomal RNAs (rRNAs) and a non-coding control region.

Characterization of the complete mitochondrial genome of Pelteobagrus intermedius (Nichols et Pope)

Pelteobagrus intermedius is a unique freshwater fish native species in the Hainan Island and Guangxi and other water systems of China. In this study, the complete mitochondrial genome sequence of P. intermedius was determined from whole genome Illumina sequencing data. The total length of the mtDNA was 16,532 bp, including 13 protein-coding genes, 22 transfer RNA genes, two ribosomal RNA genes, and a non-coding control region. Phylogenetic analysis suggested that the P. intermedius is closely related to Tachysurus fulvidraco. The results will serve as a helpful reference for further studies on the conservation genetics of genus Pelteobagrus.

Complete mitochondrial genome of the freshwater fish, Carassioides acuminatus (Cypriniformes, cyprinidae)

In this study, the complete mitochondrial genome of Carassioides acuminatus was first sequenced and annotated. The entire mitogenome is 16,579bp in length, which consists of 13 protein-coding genes (PCGs), 22 transfer RNA genes, 2 ribosomal RNA genes, and a control region (D-loop). The overall nucleotide composition of the C. acuminatus mitochondrial genome shows an obvious anti-G bias. The accuracy of the fresh sequences was verified by phylogenetic analysis. The complete mitochondrial genome of C. acuminatus is useful to population genetics and molecular systematics.