Eimeria that infect fish are diverse and are related to, but distinct from, those that infect terrestrial vertebrates
Eimeria that infect fish are diverse and are related to, but distinct from, those that infect terrestrial vertebrates
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DOI：
10.1016/j.meegid.2012.06.017
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发表时间：
2012-12-01
影响因子：
3.2
通讯作者：
Rosenthal, Benjamin M.
中科院分区：
文献类型：
--
作者：
Molnar, Kalman;Ostoros, Gyoergyi;Rosenthal, Benjamin M.
艾美球虫是脊椎动物肠道上皮的普遍寄生虫（门：顶复门;科：球虫），其在单一宿主物种中完成其发育，并且其孢子囊可以通过其子孢子通过其出囊的Stieda体的存在来识别。基于18 S核糖体DNA测序的分子系统学研究成功地探索了它们的多样性及其与其它种类球虫的关系。迄今为止，艾美耳球虫属的多样性和进化关系一直是人们关注的焦点。寄生陆生脊椎动物，尤其是那些感染家养鸟类和哺乳动物的物种。遗憾的是，没有艾美耳球虫被认为是地球上第一种脊椎动物：鱼。如果艾美球虫首先在鱼类中进化，那么现存的鱼类寄生虫应该包括一个深分支组合在良好构建的系统发育树的基础上。在这里，我们对几个这样的分离株（来自鳗艾美耳球虫、戴维斯艾美耳球虫、穿孔艾美耳球虫、变异艾美耳球虫、红艾美耳球虫和奈氏艾美耳球虫）的核糖体DNA部分进行测序，并将它们彼此进行比较，以及与来自鱼类和陆生脊椎动物寄生虫的其他可用序列进行比较，以便更好地了解它们的多样性和起源。通过建立这种鱼类寄生虫包括一个深分支在基地的艾美球虫，这些数据证实了假设，艾美球虫可能起源于鱼类。显然，大量的球虫多样性有待于未来的发现和描述。由爱思唯尔公司出版
The Eimeria are ubiquitous parasites (Phylum: Apicomplexa; family: Coccidia) of the gut epithelium of vertebrates which complete their development in a single host species and whose sporocysts may be recognized by the presence of a Stieda body through which their sporozoites excyst. Their diversity and relationship to other kinds of coccidia have been successfully explored by molecular systematic studies based on the sequencing the 18S ribosomal DNA. To date, most attention has been paid to the diversity and evolutionary relationships of Eimeria spp. parasitizing terrestrial vertebrates, most especially those species infecting domesticated birds and mammals. Regrettably, no Eimeria have yet been considered from the Earth's first vertebrates: the fish. If Eimeria first evolved in fish, then extant piscine parasites should comprise a deeply branching assemblage at the base of well-constructed phylogenetic trees. Here, we sequenced portions of ribosomal DNA from several such isolates (from Eimeria anguillae, Eimeria daviesae, Eimeria percae, Eimeria variabilis, Eimeria rutili and Eimeria nemethi) and compared them to one another as well as to other available sequences from the parasites of fish and terrestrial vertebrates, in order to better understand their diversity and origins. By establishing that such piscine parasites comprise a deeply branching clade at the base of the Eimeriidae, these data substantiate the hypothesis that Eimeria may have originated in fish. Plainly, a great deal of coccidian diversity awaits future discovery and description. Published by Elsevier B.V.