Xiaoyue Zhu, Zihui Wang, Shun Yao, Jiasheng Hao
In this study, the first complete mitochondrial genome (mitogenome) of lepidopteran family Drepanidae (superfamily Drepanoidea) was reported with the notes about its phylogenetic implications. The Oreta fuscopurpurea mitogenome is 15,564 bp in length, including 13 protein-coding genes, two ribosomal RNAs (lrRNA and srRNA), 22 transfer RNAs and a non-coding control region (AT-rich region), with a 79.6% A+T content. The gene orientation and arrangement of the mitogenome are the same as other sequenced lepidopterans. All protein-coding genes usually start with the common ATN codon except for COI gene, which used CGA as the initial codon; eight PCGs use a typical stop codon of TAA, whereas the remaining PCGs use incomplete stop codon of T or TA. All tRNAs have the typical clover-leaf structure with the exception of tRNASer (AGN). The lrRNA and srRNA genes are 1,409 bp and 778 bp in size respectively, with the former harboring one (TA)13 microsatellite-like repeat and an 17 bp insertion. The 20 intergenic spacers totaling of 184 bp and 8 overlapping sequences totaling of 25 bp are scattered throughout the whole mitogenome. The 526 bp AT-rich region contains some structures characteristic of lepidopterans, such as the motif ATAGA preceded by an 19 bp poly-T stretch, a tRNA-like and a sterm-loop structures. Phylogenetic analysis of the Oreta fuscopurpurea with other 47 insect species covering 20 lepidopteran families were conducted based on the sequence data of the 13 mitogenomic protein coding genes with maximum likelihood (ML) and Bayesian inference (BI) methods, and the results showed distinctly that the superfamily Drepanoidea was sister to the clade of (Bombycoidea, Lasiocampoidea) + (Noctuoidea, Geometroidea).
