Abstract
In the present study, the complete mitochondrial DNA sequence of the milkfish Lactarius lactarius is determined. The full-length of the mitochondrial genome consists of a 16,552 bp fragment, with the base composition of A (28.24%), C (29.82%), G (15.96%), and T (25.98%) with a high A + T content (54.22%). The base compositions present clearly the A-T skew, which is most obvious in the control region and protein-coding genes. It includes 2 ribosomal RNA (rRNA) genes, 13 protein-coding genes (PCGs), 22 transfer RNA (tRNA) genes, and a major non-coding control region (D-loop region). Furthermore, the composition and order of these genes are identical to most of other vertebrates. All the protein initiation codons are ATG, except that COX1 and ATP6 begin with GTG. All the protein termination codons are TAA, except ND3 and ND6 end with TAG, and COXII, ND4, Cytb finish only with incomplete T. Furthermore, the phylogenetic analysis base on 13 concatenated PCGs amino acid datasets among the 14 species, suggesting that high value support for the following sister clade with Toxotes chatareus. Our findings provide useful information for phylogenetic and evolutionary research of Perciformes species.
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