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n. sp.，一种感染中国海马的内共生微孢子虫。

n. sp., an Intranuclear Microsporidian Infecting the Seahorse From China.

机构信息

East China Sea Fisheries Research Institute, China Academy of Fishery Sciences, Shanghai, China.

College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, China.

出版信息

Front Cell Infect Microbiol. 2022 May 4;12:882843. doi: 10.3389/fcimb.2022.882843. eCollection 2022.

DOI:10.3389/fcimb.2022.882843
PMID:35601100
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9114889/
Abstract

The life cycle, ultrastructure, and molecular phylogeny of a new intranuclear microsporidian, n. sp., infecting the intestine of the , were described. The histopathology revealed an extensive infection, mainly in the columnar epithelium of the intestinal mucosa layer. The enterocytes were the important target cell for n. sp. infection. Transmission electron microscopy results showed that this microsporidian developed directly within the host cell nucleoplasm. In the intranuclear life cycle, the transformation from meront to sporogonial plasmodium was recognized by forming electron-dense disc structures, which were considered the polar tube precursors. The microsporidian showed the typical morphological characteristics of the family Enterocytozoonidae in the formation and development of spore organelles prior to the division of the sporogonial plasmodium. According to wet smear observation, eight spores were generally formed in a single host nucleus. Mature spores were elongated ovoids that were slightly bent and measured 1.93 × 0.97 μm. The isofilar polar tube was arranged in 7~8 coils in one row. Phylogenetic analysis of its small subunit ribosomal DNA sequences demonstrated that the parasite belonged to the group clade. The histological, ultrastructural, and molecular data support the emergence of a new species in the genus . This is the first report of species in Asia and threatened syngnathid fishes.

摘要

描述了一种新的内生核微孢子虫，n. sp.，感染 的肠道的生命周期、超微结构和分子系统发育。组织病理学显示广泛感染，主要在肠黏膜层的柱状上皮中。肠细胞是 n. sp. 感染的重要靶细胞。透射电子显微镜结果表明，这种微孢子虫在宿主细胞核质中直接发育。在核内生活史中，通过形成电子致密盘状结构，识别从滋养体到孢子生殖质的转化，这些结构被认为是极管前体。在孢子生殖质分裂之前，微孢子虫在孢子细胞器的形成和发育过程中表现出肠细胞孢虫科的典型形态特征。根据湿涂片观察，一个宿主核内通常形成 8 个孢子。成熟的孢子为长椭圆形，稍弯曲，大小为 1.93×0.97μm。等丝极管排列成一行 7-8 圈。其小亚基核糖体 DNA 序列的系统发育分析表明，寄生虫属于 组分支。组织学、超微结构和分子数据支持了该属出现一个新种。这是亚洲和受威胁的合鳃鱼中 种的首次报道。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8ec/9114889/f5e52b5b758a/fcimb-12-882843-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8ec/9114889/791b62382973/fcimb-12-882843-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8ec/9114889/89e4d11b3dda/fcimb-12-882843-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8ec/9114889/041896aa7426/fcimb-12-882843-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8ec/9114889/9a964f372e71/fcimb-12-882843-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8ec/9114889/1ba51ac00bce/fcimb-12-882843-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8ec/9114889/432cdb0850bd/fcimb-12-882843-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8ec/9114889/94fadb9a66cc/fcimb-12-882843-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8ec/9114889/f5e52b5b758a/fcimb-12-882843-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8ec/9114889/791b62382973/fcimb-12-882843-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8ec/9114889/89e4d11b3dda/fcimb-12-882843-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8ec/9114889/041896aa7426/fcimb-12-882843-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8ec/9114889/9a964f372e71/fcimb-12-882843-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8ec/9114889/1ba51ac00bce/fcimb-12-882843-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8ec/9114889/432cdb0850bd/fcimb-12-882843-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8ec/9114889/94fadb9a66cc/fcimb-12-882843-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8ec/9114889/f5e52b5b758a/fcimb-12-882843-g008.jpg

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