Characterization of the complete mitochondrial genome of Wuhaniligobius polylepis (Gobiiformes: Gobiidae) and phylogenetic studies of Gobiiformes

Abstract

The environmental changes mainly caused by water pollution and human activities have dramatically threatened the survival of the small-scaled Wu's goby W. polylepis. In the present study, the complete mitogenome of Wuhaniligobius polylepis was determined, which is 16,496 bp in length, containing 13 PCGs, two rRNA genes, 22 tRNA genes and a putative control region. The overall base composition is 28.6%, 29.0%, 26.7%, and 15.7% for A, T, C and G, respectively. The 13 PCGs encode 3,802 amino acids in total, twelve of which use the initiation codon ATG except COI, which uses GTG. In order to explore the systematic status of W. polylepis and further phylogenetic study of Gobiiformes, a maximumlikelihood tree was constructed based on the concatenated sequences of 12 PCGs. The result showed that Pseudogobius, Hemigobius, and Mugilogobius clustered into a clade and then formed a sister-group with W. polylepis, suggesting the invalid former name of M. polylepis or E. polylepis.

Comparative Analysis of Complete Mitochondrial Genome of Ariosoma meeki (Jordan and Snider, 1900), Revealing Gene Rearrangement and the Phylogenetic Relationships of Anguilliformes

“…Nevertheless, two types of gene arrangements have been detected in the mitogenomes of Anguilliformes. As observed in the mitogenomes of Anguilla marmorata (Anguillidae), Ilyophis brunneus (Synaphobranchidae), Serrivomer sector (Serrivomeridae), and Gymnothorax minor (Muraenidae), which possess the typical mitochondrial structure, the genes ND6 and the conjoint tRNA-Glu were found to be typically situated between ND5 and Cytb , among which the Cytb was sandwiched by tRNA-Glu and tRNA-Pro, without the insertion of a D-loop between Cytb and ND6 [ 56 ] ( Figure 7 C). In the mitogenomes of A. meeki and A. shiroanago, ND6 and tRNA-Glu were translocated upstream of tRNA-Pro and downstream of tRNA-Thr , respectively, accompanied by the insertion of a larger non-coding region.…”

Novel gene rearrangement in the mitochondrial genome of Muraenesox cinereus and the phylogenetic relationship of Anguilliformes

“…Compared with the gene arrangement in the vertebrate mitochondrial genome, the gene order in the moray mitochondrial genome obviously rearranged 57 (Fig. 1 ).…”