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首页> 外文期刊>Parasites Vectors >Free-living ciliates as potential reservoirs for eukaryotic parasites: occurrence of a trypanosomatid in the macronucleus of Euplotes encysticus
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Free-living ciliates as potential reservoirs for eukaryotic parasites: occurrence of a trypanosomatid in the macronucleus of Euplotes encysticus

机译：作为真核寄生虫的潜在水库的自由生活纤毛：Euplotes通红的常规核糖核糖中的锥虫发生

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Background Flagellates of the family Trypanosomatidae are obligate endoparasites, which can be found in various hosts. Several genera infect insects and occur as monoxenous parasites especially in representatives of Diptera and Hemiptera. These trypanosomatid flagellates probably share the worldwide distribution of their hosts, which are often infested by large numbers of endoparasites. Traditionally, their taxonomy was based on morphology, host origin, and life cycle. Here we report the characterization of a trypanosomatid infection detected in a protozoan, a ciliate collected from a polluted freshwater pond in a suburb of New Delhi (India). Methods Live observations and morphological studies applying light, fluorescence and transmission electron microscopy were conducted. Molecular analyses of host and parasite were performed and used for phylogenetic reconstructions and species (host) or genus level (parasite) identification. Results Although the morphological characteristics were not revealing, a high similarity of the trypanosomatids 18S rRNA gene sequence to Herpetomonas ztiplika and Herpetomonas trimorpha (Kinetoplastida, Trypanosomatidae), both parasites of biting midges (Culicoides kibunensis and Culicoides truncorum, respectively) allowed the assignment to this genus. The majority of the host population displayed a heavy infection that significantly affected the shape of the host macronucleus, which was the main site of parasite localization. In addition, the growth rate of host cultures, identified as Euplotes encysticus according to cell morphology and 18S rRNA gene sequence, was severely impacted by the infection. Conclusions The host-parasite system described here represents a recent example of free-living protists acting as environmental reservoirs for parasitic eukaryotic microorganisms.
机译：背景技术胰蛋白酶酸酐的鞭毛是冠状动脉内缺血物，其可以在各种宿主中找到。几种属性感染昆虫，并且发生作为单烯类寄生虫，特别是在Diptera和Hemiptera的代表中。这些胰蛋白酶瘤素鞭毛可能分享他们的宿主的全球分布，这通常受到大量内帕拉斯遗失的影响。传统上，他们的分类学基于形态，宿主起源和生命周期。在这里，我们报告了在新德里（印度）郊区的污染淡水池中收集的胰蛋白酶体感染的表征。方法进行施加光，荧光和透射电子显微镜的实时观察和形态学研究。进行宿主和寄生虫的分子分析，并用于系统发育重建和物种（宿主）或属（寄生虫）鉴定。结果虽然形态特征不揭示，但锥虫瘤素18s的高度相似性，宫颈炎Ztiplika和血脚蛋白的三分肠（KINETOPLASTIDA，TROPANOSOMATIDAE），咬住中介的寄生虫（分别分别=分别）允许任务属。大多数宿主人群显示出严重的感染，显着影响宿主核糖核桃的形状，这是寄生虫本地化的主要部位。此外，根据细胞形态和18S rRNA基因序列鉴定为宿主培养的生长速率，鉴定为欧洲峰心梗塞，受到感染严重影响。结论这里描述的宿主寄生虫系统代表了作为寄生真核微生物的环境储层的自由生活质量的最新例。

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