Characterization of the complete mitochondrial genome of an endangered alpine toad, Scutiger ningshanensis (Amphibia: Anura: Megophryidae)

Song, Jing; Tian, Yu; Guan, De-Long

Characterization of the complete mitochondrial genome of an endangered alpine toad, Scutiger ningshanensis (Amphibia: Anura: Megophryidae)

2017

Song, Jing | Tian, Yu | Guan, De-Long

Scutiger ningshanensis has been listed as an endangered species by the International Union for Conservation of Nature and Natural Resources. Here we report the complete mitochondrial genome of S. ningshanensis, which we hope will be useful for species identification and will contribute to further phylogenetic studies. The circular genome is 17,265 bp in length and encodes the same typical 37 mitochondrial genes. Most of these genes are located on the heavy strand, except for ND6 and eight tRNA genes. The nucleotide composition is particularly rich in A and T, with an overall A + T content of 61.8 %. All the protein-coding genes have the standard ATG initiation codon, except for COX1 and ATP8, which initiate translation at GTG. All protein-coding genes are terminated by either TAA or incomplete T(aa) stop codons. A typical set of 22 tRNA genes are present, but their arrangement is unique, with three (tRNA-Ile, tRNA-Phe and tRNA-Trp) found at inverted locations. Because of this gene rearrangement, the control region is located between tRNA-Pro and tRNA-Ile instead of between tRNA-Pro and tRNA-Phe.

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