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A global map of genetic diversity in Babesia microti reveals strong population structure and identifies variants associated with clinical relapse

机译:全球小巴贝虫的遗传多样性图揭示了强大的种群结构并鉴定了与临床复发相关的变异

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摘要

Human babesiosis caused by Babesia microti is an emerging tick-borne zoonosis of increasing importance due to rising incidence and expanding geographic range. Infection with this organism, an intraerythrocytic parasite of the phylum Apicomplexa, causes a febrile syndrome similar to malaria. Relapsing disease is common among immunocompromised and asplenic individuals,, and drug resistance has recently been reported. To investigate the origin and genetic diversity of this parasite, we sequenced the complete genomes of 42 B. microti samples from around the world, including deep coverage of clinical infections at endemic sites in the continental United States. Samples from the continental US segregate into a Northeast lineage and a Midwest lineage, with subsequent divergence of subpopulations along geographic lines. We identify parasite variants that associate with relapsing disease, including amino acid substitutions in the atovaquone-binding regions of cytochrome b (cytb) and the azithromycin-binding region of ribosomal protein subunit L4 (rpl4). Our results shed light on the origin, diversity, and evolution of B. microti, suggest possible mechanisms for clinical relapse, and create the foundation for further research on this emerging pathogen.
机译:由小肠杆菌引起的人杆状杆菌病是一种新兴的由tick传播的人为传播的人畜共患病,由于其发病率上升和地理范围不断扩大 。感染这种生物体的是蜂巢门的红细胞内寄生虫,会引起类似于疟疾的高热综合征。 免疫功能低下和无脾的个体中复发性疾病很常见, ,最近据报道对药物有耐药性 。为了调查这种寄生虫的起源和遗传多样性,我们对来自世界各地的42株小孢子虫样品的完整基因组进行了测序,包括对美国本土流行点临床感染的深入报道。来自美国大陆的样本分为东北谱系和中西部谱系,随后沿地理界线划分了亚群。我们确定与复发性疾病相关的寄生虫变异,包括在细胞色素b(cytb)的atovaquone结合区和核糖体蛋白亚基L4(rpl4)的阿奇霉素结合区中的氨基酸取代。我们的研究结果揭示了微小芽孢杆菌的起源,多样性和进化,为临床复发提供了可能的机制,并为进一步研究这种新兴病原体奠定了基础。

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