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一种感染鲑科鱼类和淡水虾的新型微孢子虫新种的分子和形态学描述。

Molecular and morphological description of a novel microsporidian n. sp. infecting both salmonid fish and freshwater prawns.

作者信息

Yanagida Tetsuya, Asai Nanami, Yamamoto Michitaka, Sugahara Kazuhiro, Fujiwara Takuto, Shirakashi Sho, Yokoyama Hiroshi

机构信息

Laboratory of Parasitology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8511, Japan.

Aquaculture Research Institute, Kindai University, Wakayama 649-2211, Japan.

出版信息

Parasitology. 2023 Jan;150(1):1-14. doi: 10.1017/S003118202200141X. Epub 2022 Oct 13.

DOI:10.1017/S003118202200141X
PMID:36226572
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10090623/
Abstract

A new microsporidian disease of cultured rainbow trout has recently been confirmed in Japan, and the causative species was tentatively designated as sp. RBT-2021. Involvement of common prawn in its transmission was suggested based on the previous feeding trials, although the microsporidian infection in was not confirmed. In this study, in Lake Biwa, Japan was investigated for microsporidian infection and 4 types of spores (types 1–4) were newly found. The nucleotide sequence of the small subunit ribosomal RNA gene was identical between type 1 and sp. RBT-2021, indicating they are conspecific. However, intriguingly, the spore morphology and the mode of development in fish and prawn were strikingly different. Morphological observations revealed type 1 in the prawn possesses characteristics of the genus Overstreet and Weidner, 1974, while sp. RBT-2021 in the trout exhibited the characteristics of the genus Lom, Dyková and Tonguthai, 2000. In the phylogeny, type 1 was placed within a clade comprising spp. and . Based on the morphological and molecular analyses, we describe sp. RBT-2021 as n. sp. Together with the success of the previous prawn-feeding trials, this study strongly suggests n. sp. has a multi-host life cycle utilizing fish and crustacean hosts and different modes of development in each host. Such polymorphic life cycle has barely been known among fish microsporidians. This study also suggests that the genus is a junior synonym of the genus .

摘要

日本最近确认了一种养殖虹鳟鱼的新型微孢子虫病，致病物种暂定为RBT - 2021种。根据之前的投喂试验，推测普通对虾参与了其传播，尽管未确认对虾中的微孢子虫感染情况。在本研究中，对日本琵琶湖中的对虾进行了微孢子虫感染调查，新发现了4种类型的孢子（1 - 4型）。1型孢子的小亚基核糖体RNA基因核苷酸序列与RBT - 2021种相同，表明它们是同种的。然而，有趣的是，孢子形态以及在鱼类和对虾中的发育模式存在显著差异。形态学观察显示，对虾中的1型孢子具有1974年Overstreet和Weidner属的特征，而鳟鱼中的RBT - 2021种表现出2000年Lom、Dyková和Tonguthai属的特征。在系统发育中，1型孢子位于一个包含某些种的进化枝内。基于形态学和分子分析，我们将RBT - 2021种描述为新种。结合之前对虾投喂试验的成功结果，本研究强烈表明该新种具有利用鱼类和甲壳类宿主的多宿主生命周期，且在每个宿主中有不同的发育模式。这种多态生命周期在鱼类微孢子虫中几乎不为人知。本研究还表明，[此处原文缺失相关属名]属是[此处原文缺失相关属名]属的次异名。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/373d/10268133/f4edf78b2dc0/S003118202200141X_fig10.jpg
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