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首页> 外文期刊>International Journal for Parasitology >The identification of a new Giardia duodenalis assemblage in marine vertebrates and a preliminary analysis of G. duodenalis population biology in marine systems.
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The identification of a new Giardia duodenalis assemblage in marine vertebrates and a preliminary analysis of G. duodenalis population biology in marine systems.

机译：在海洋脊椎动物中鉴定新的贾第鞭毛虫十二指肠组合，并对海洋系统中十二指肠十二指肠种群生物学进行初步分析。

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Giardia duodenalis is an intestinal parasite of many vertebrates. The presence of G. duodenalis in the marine environment due to anthropogenic and wildlife activity is well documented, including the contributions from untreated sewage and storm water, agricultural run-off and droppings from terrestrial animals. Recently, studies have detected this protistan parasite in the faeces of marine vertebrates such as whales, dolphins, seals and shore birds. To explore the population biology of G. duodenalis in marine life, we determined the prevalence of G. duodenalis in two species of seal (Halichoerus grypus, Phoca vitulina vitulina and Phoca vitulina richardsi) from the east and west coasts of the USA, sequenced two loci from G. duodenalis-positive samples to assess molecular diversity and examined G. duodenalis distribution amongst these seals and other marine vertebrates along the east coast. We found a significant difference in the presence of G. duodenalis between east and west coast seal species. Only the zoonotic lineages of G. duodenalis, Assemblages A and B and a novel lineage, which we designated as Assemblage H, were identified in marine vertebrates. Assemblages A and B are broadly distributed geographically and show a lack of host specificity. Only grey seal (Halichoerus grypus) samples and one gull sample (Larus argentatus) from a northern location of Cape Cod, Massachusetts, USA, showed the presence of Assemblage H haplotypes; only one other study of harbour seals from the Puget Sound region of Washington, USA previously recorded the presence of an Assemblage H haplotype. Assemblage H sequences form a monophyletic clade that appears as divergent from the other seven Assemblages of G. duodenalis as these assemblages are from each other. The discovery of a previously uncharacterised lineage of G. duodenalis suggests that this parasite has more genetic diversity and perhaps a larger host range than previously believed.
机译：贾第鞭毛虫是许多脊椎动物的肠道寄生虫。由于人为和野生动植物活动而在海洋环境中存在十二生杜鹃，包括未经处理的污水和暴雨水，农业径流和陆生动物粪便的贡献。最近，研究已经在鲸鱼，海豚，海豹和shore鸟等海洋脊椎动物的粪便中检测到这种原生动物的寄生虫。为了探索海洋中G. duodenalis的种群生物学，我们确定了美国东海岸和西海岸的两种海豹物种（Halichoerus grypus，Phoca vitulina vitulina和Phoca vitulina richardsi）中的G. duodenalis患病率，对其中两个进行了测序来自十二指肠菌阳性样本的基因座以评估分子多样性，并检查了十二指肠菌在这些海豹和东海岸其他海洋脊椎动物之间的分布。我们发现东海岸和西海岸海豹物种之间存在十二指肠球菌存在显着差异。在海洋脊椎动物中仅鉴定了十二指肠球菌的人畜共患谱系，组合A和组合B，以及我们称为新组合H的新谱系。程序集A和B在地理上分布广泛，并且缺乏宿主特异性。仅来自美国马萨诸塞州科德角北部的灰海豹（Halichoerus grypus）样品和一个海鸥样品（Larus argentatus）显示存在组合H单倍型;仅另一项来​​自美国华盛顿普吉特海湾地区的海豹的研究先前记录了一种Assemblage H单倍型的存在。组合H序列形成单系进化枝，其看起来与十二指肠球菌的其他七个组合彼此不同，因为这些组合彼此不同。十二指肠球菌先前未鉴定的谱系的发现表明，该寄生虫比以前认为的具有更多的遗传多样性和更大的宿主范围。

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