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首页> 外文期刊>Parasitology Research >Morphological and phylogenetic description of a new xenoma-inducing microsporidian, Microsporidium aurata nov. sp., parasite of the gilthead seabream Sparus aurata from the Red Sea
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Morphological and phylogenetic description of a new xenoma-inducing microsporidian, Microsporidium aurata nov. sp., parasite of the gilthead seabream Sparus aurata from the Red Sea

机译：一种新的诱生瘤的微孢子虫微孢子虫的形态学和系统发育描述。 sp。，来自红海的金头鲷鲷Sparus aurata的寄生虫

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摘要

A new species of Microsporidia found in the marine teleost Sparus aurata collected from Hurghada coasts along the Red Sea, Egypt was described based on light and ultrastructural studies. Twenty three (30.6 %) out of 75 of the examined fish were parasitized with a microsporidian parasite. Numerous macroscopic whitish cysts embedded in the peritoneal cavity were observed to infect many organs of the body including muscles, connective tissues, and the intestinal epithelium. The infection was developed as tumor-like masses of often up to 5 mm in diameter inducing an enormous hypertrophy to the infected organs. Fresh spores appeared mostly ovoid to pyriform in shape reaching a size of 1.7 ± 0.5 (1.5-2.5) μm × 1.3 ± 0.4 (1-2) μm; they possessed a large vacuole at the posterior end. These spores were located within a sporophorous vesicle which was bound by a thick amorphous wall. The ultrastructural features support the placement of the present species within the genus Microsporidium. The developmental stages were enclosed within a xenoma structure that was bounded by a double-layered cyst wall. The life cycle of the microsporidian pathogen described herein included four stages: proliferation (merogony), sporogony, sporoblast, spores, and liberation. Mature spores appeared electron dense, uninucleate, and were ellipsoidal in shape. At the anterior end of the spore, the anchoring disk was found in a central position. There was a definite number (5-11) of turns of the polar tube. A 538-bp region of the SSU rDNA gene of the studied species was sequenced (GenBank accession number: KF0220444). Multiple sequence alignment calculated a high degree of similarity (>92 %) with six microsporidian species. The most closely related sequence was provided by the GenBank entry AF151529 for Microsporidium prosopium isolated from Hyperoplus lanceolatus differing in 67 nucleotide positions in its SSU rDNA with the highest percentage of identity (97.2 %) and the lowest divergence value (0.20). Variations in the morphology of the spores and developmental stages between the two species revealed that the two species are different. The site of infection in the host and description of the onset of parasite development are strong criteria for the placement of the microsporidian parasite of the fish S. aurata within the genus Microsporidium as a new species, and we propose to name it Microsporidium aurata nov. sp.
机译：根据轻度和超微结构研究，描述了一种新的微孢子虫，该微孢子虫存在于从埃及红海沿岸的洪加达海岸采集的海洋硬骨鱼Spaus aurata中。在检查的75条鱼中，有23条（30.6％）被微孢子虫寄生。观察到许多嵌入在腹膜腔内的宏观白色发白囊肿会感染人体的许多器官，包括肌肉，结缔组织和肠上皮。感染发展为直径通常高达5毫米的类肿瘤块，对受感染的器官产生巨大的肥大。新鲜的孢子多数呈卵形至梨形，大小为1.7±0.5（1.5-2.5）μm×1.3±0.4（1-2）μm。他们在后端有一个大的液泡。这些孢子位于孢子囊中，囊囊被厚厚的无定形壁束缚。超微结构特征支持当前物种在微孢子虫属内的放置。发育阶段被封闭在以双层囊肿壁为边界的异种瘤结构内。本文所述的微孢子虫病原体的生命周期包括四个阶段：增殖（成语），孢子形成，孢子母细胞，孢子和释放。成熟的孢子表现为电子致密，单核且呈椭圆形。在孢子的前端，发现锚定盘处于中心位置。极管有确定的匝数（5-11）。对所研究物种的SSU rDNA基因的538 bp区域进行测序（GenBank登录号：KF0220444）。多序列比对计算出与六个微孢子虫物种的高度相似性（> 92％）。 GenBank条目AF151529提供了最紧密相关的序列，该序列用于从轮藻Hyperoplus分离出的微小假单胞菌，其SSU rDNA的67个核苷酸位置不同，同一性百分比最高（97.2％），差异值最低（0.20）。两个物种之间的孢子形态和发育阶段的变化表明，这两个物种是不同的。寄主中的感染部位和对寄生虫发育的描述是将金黄色葡萄球菌微孢子虫寄生虫放置在微孢子虫属中作为一个新物种的强有力标准，我们建议将其命名为微孢子虫。 sp。

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