The mitochondrial genome of the ornate sheep tick, Dermacentor marginatus
The ornate sheep tick, Dermacentor marginatus, is widespread in Europe. Its vector role of various zoonotic pathogens received much attention in these regions. However, the genomic resources of the ticks are limited. In this study, the complete mitochondrial genome of a single female D. marginatus collected in Slovakia was sequenced through the Illumina HiSeq sequencing platform. The mitochondrial genome is 15,067 bp long and contains 13 protein-coding genes, two ribosomal RNA genes and 22 transfer RNA genes. The overall G+C content is 21.6%. The gene order is identical to that of Metastriata ticks. The codon usage pattern is similar with that of other tick species. As in other ticks, two truncated tRNA genes were observed. Two control regions were found between tRNA-Leu and tRNA-Cys, tRNA-Ile and rrnS, respectively. The mitochondrial genome contains three noncoding regions, which is similar to that in D. nitens. The noncoding region located between rrnS and tRNA-Val is shorter than that of other Dermacentor species. Phylogenetic analyses indicate that D. marginatus is clustered with other Dermacentor species. These findings are helpful for exploring the systematics and evolution of ticks in the future.
Keywords:Mitochondrial genome Dermacentor marginatus High-throughput sequencing Phylogenetic analysis
We thank Dr. Tian-Hong Wang of Hebei Normal University for his kind help in data analyses. This study was supported by Scientific and Technological Cooperation Project of China and Slovakia (7–12; APVV-SK-CN-2015-0010), Advanced Talents of Hebei Normal University (Grant No. L2018B15), Natural Science Foundation of Hebei province (Grant No. C2018205211) and National Natural Science Foundation of China (Grant No. 31802008), Project of the Slovak Scientific Grant Agency VEGA (No. 2/0126/16).
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