Unraveling the mystery of a myxozoan parasite of the trout: redescription of Chloromyxum schurovi.

IF 1.5 4区 医学 Q3 PARASITOLOGY
Martina Lisnerova, Pavla Bartosova-Sojkova, Monika Burgerova, Ivan Fiala
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引用次数: 0

Abstract

Myxozoans are microscopical parasites widely distributed in fish, with over 2,600 described species, but their actual diversity is still underestimated. Among salmonids, more than 70 myxozoan species have been identified. This study focuses on species of Chloromyxum Mingazzini, 1890 that infect salmonid kidneys, particularly C. majori Yasutake et Wood, 1957 and C. schurovi Shulman et Ieshko, 2003. Despite their similar spore morphology, they exhibit distinct host preferences, tissue affinities and geographical distributions. Chloromyxum schurovi predominantly infects the renal tubules of Salmo salar Linnaues and S. trutta Linnaeus in Europe, while C. majori targets the glomeruli of Oncorhynchus mykiss (Walbaum) and O. tshawytscha (Walbaum) in North America. The sequence data for C. majori and C. schurovi have been either missing or questionable. In our study, we examined the kidneys of two salmonid species for chloromyxid infections, using both morphological and molecular data to characterise Chloromyxum species in salmonids. The sequence of C. schurovi obtained in our study did not match the previously published parasite data. Instead, it clustered as an independent lineage sister to the Paramyxidium Freeman et Kristmundsson, 2018 clade gathering the species from various fish organs, including the urinary tract. Our findings clarified the taxonomic origin of the previous C. schurovi sequence as Myxidium giardi Cépède, 1906, highlighting the risks associated with the presence of myxozoan blood stages in the bloodstream of their fish host and the challenges of non-specific PCR amplification. We redescribe C. schurovi, thus contributing to a better understanding of the diversity and phylogeny of kidney-infecting species of Chloromyxum.

揭开鳟鱼肌寄生虫的神秘面纱:重新描述 Chloromyxum schurovi。
粘孢子虫是广泛分布于鱼类体内的微型寄生虫,已描述的种类超过 2,600 种,但其实际多样性仍被低估。在鲑科鱼类中,已经发现了 70 多种粘孢子虫。本研究的重点是感染鲑鱼肾脏的 Chloromyxum Mingazzini(1890 年)物种,尤其是 C. majori Yasutake et Wood(1957 年)和 C. schurovi Shulman et Ieshko(2003 年)。尽管它们的孢子形态相似,但在寄主偏好、组织亲缘关系和地理分布上却各不相同。Chloromyxum schurovi 主要感染欧洲的 Salmo salar Linnaues 和 S. trutta Linnaeus 的肾小管,而 C. majori 主要感染北美的 Oncorhynchus mykiss (Walbaum) 和 O. tshawytscha (Walbaum) 的肾小球。C.majori和C.schurovi的序列数据要么缺失,要么值得怀疑。在我们的研究中,我们对两种鲑鱼的肾脏进行了检查,利用形态学和分子数据来确定鲑鱼中氯霉菌的感染情况。我们在研究中获得的 C. schurovi 的序列与之前公布的寄生虫数据不符。相反,它作为一个独立的支系与 Paramyxidium Freeman et Kristmundsson(2018 年)支系姊妹,该支系聚集了来自各种鱼类器官(包括泌尿道)的物种。我们的研究结果澄清了之前的C. schurovi序列(Myxidium giardi Cépède, 1906)的分类起源,凸显了鱼类宿主血液中存在粘孢子虫血液阶段所带来的风险,以及非特异性PCR扩增所带来的挑战。我们对 C. schurovi 进行了重新描述,从而有助于更好地了解肾脏感染性氯膜虫物种的多样性和系统发育。
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来源期刊
Folia Parasitologica
Folia Parasitologica 医学-寄生虫学
CiteScore
2.70
自引率
0.00%
发文量
25
审稿时长
>12 weeks
期刊介绍: FOLIA PARASITOLOGICA, issued in online versions, is an international journal that covers the whole field of general, systematic, ecological and experimental parasitology. It publishes original research papers, research notes and review articles. Contributions from all branches of animal parasitology, such as morphology, taxonomy, biology, biochemistry, physiology, immunology, molecular biology and evolution of parasites, and host-parasite relationships, are eligible. Novelty and importance in the international (not local or regional) context are required. New geographical records of parasites, records of new hosts, regional parasite and/or host surveys (if they constitute the principal substance of manuscript), local/regional prevalence surveys of diseases, local/regional studies on epidemiology of well known diseases and of parasite impact on human/animal health, case reports, routine clinical studies and testing of established diagnostic or treatment procedures, will not be considered. One species description will also not be considered unless they include more general information, such as new diagnostic characters, host-parasite associations, phylogenetic implications, etc. Manuscripts found suitable on submission will be reviewed by at least two reviewers.
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