Limnological Institute SB RAS, Ulan-Batorskaya 3, Irkutsk, 664033, Russia,
Parasitol Res. 2014 May;113(5):1787-93. doi: 10.1007/s00436-014-3824-x. Epub 2014 Mar 7.
Dermacentor nuttalli is an epidemiologically important tick in Palearctic Asia which transmits several infectious diseases including tularemia, North Asian tick-borne rickettsiosis, Lyme disease and tick-borne encephalitis. The genetic specificity and phylogeny of D. nuttalli from four geographic localities in Eastern Siberia were characterized using the mitochondrial (mt) 16S ribosomal RNA (rRNA) gene and internal transcribed spacer 2 (ITS2). Low genetic diversity was observed in the populations of ticks distributed from South Siberia to North China. From 11 detected mt 16S haplotypes, one was found in all populations, whereas the others were restricted to specific localities. These results suggested that the genetic structure of D. nuttalli represents integrated populations with no geographic isolation across the distribution area. The phylogenetic reconstructions inferred from the mt 16S rRNA gene and ITS2 were in agreement and showed a distinct D. nuttalli clade within a monophyletic Eurasian lineage of Dermacentor sp.
驯鹿革蜱是古北界亚洲具有重要流行病学意义的一种蜱，可传播几种传染病，包括野兔热、北亚蜱传立克次体病、莱姆病和蜱传脑炎。本研究使用线粒体（mt）16S 核糖体 RNA（rRNA）基因和内部转录间隔区 2（ITS2）对来自东西伯利亚四个地理区域的 11 个驯鹿革蜱 mt 16S 单倍型进行了检测，发现其种群遗传多样性较低。在所检测的 11 个 mt 16S 单倍型中，有一种在所有种群中都有发现，而其他单倍型则局限于特定的地点。这些结果表明，驯鹿革蜱的遗传结构代表了一个没有地理隔离的综合种群，其分布区域跨越整个分布区。基于 mt 16S rRNA 基因和 ITS2 的系统发育重建结果一致，表明在 Dermacentor sp. 的单系欧亚谱系内存在一个独特的驯鹿革蜱分支。
