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首页> 外文期刊>Acta parasitologica >Molecular genetic studies on morphologically indistinguishable Myxobolus spp. infecting cyprinid fishes, with the description of three new species, M. alvarezae sp. nov., M. sitjae sp. nov. and M. eirasianus sp. nov.
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Molecular genetic studies on morphologically indistinguishable Myxobolus spp. infecting cyprinid fishes, with the description of three new species, M. alvarezae sp. nov., M. sitjae sp. nov. and M. eirasianus sp. nov.

机译：形态学上无法区分的粘菌属的分子遗传学研究。感染塞浦路斯鱼类，并描述了三个新物种，阿尔瓦雷萨菌。十一月，M. sitjae sp。十一月和M. eirasianus sp。十一月

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摘要

While studying Myxobolus gill infections of cyprinid fishes, the authors found large, segmented plasmodia in three species: ide (Leuciscus idus), asp (Aspius aspius) and white bream (Blicca bjoerkna). As regards their size and morphology, the spores from these plasmodia corresponded to those of M. dujardini described from chub (Leuciscus cephalus). However, the 18S rDNA sequences of spores from the three cyprinids differed from those of M. dujardini. Based on molecular differences, this paper describes two new species: M. alvarezae sp. nov. from ide and asp, and M. sitjae sp. nov. from white bream. The two new species and M. dujardini had a similar tissue tropism, and infected the multilayered epithelium of the gill filaments. Histological examination of the infected filaments demonstrated that the large plasmodia with multiple buddings were formed from amalgamating small plasmodia. Besides carrying infection in the filamental epithelium, the three above fish species were infected by small intralamellar plasmodia as well. These plasmodia were filled by spores that resembled the roach parasite M. intimus both in morphology and seasonal development. The 18S rDNA sequences of 'intimus-like' spores from ide and asp differed only in some base pairs from spores found in the type host roach, and were identified as belonging to M. intimus. The spores found in white bream, however, showed 3.6-5.0% difference in DNA sequence from those of M. intimus; therefore, they have been described as M. eirasianus sp. nov. The aim of this paper was to demonstrate the importance of using molecular methods for separating and identifying morphologically corresponding or closely similar Myxobolus spp.
机译：在研究塞浦路斯鱼类的粘菌x感染时，作者发现了大型，分段的疟原虫，分为三种：ide（Leuciscus idus），asp（Aspius aspius）和白鲷（Blicca bjoerkna）。关于它们的大小和形态，来自这些浆原体的孢子对应于从chub（头尾叶猴）描述的杜氏支原体的孢子。但是，来自三个鲤科鱼的孢子的18S rDNA序列与杜氏支原体不同。基于分子差异，本文描述了两个新物种：M. alvarezae sp.。十一月来自ide和asp，以及M. sitjae sp。十一月从白鲷。这两个新物种和杜氏疟原虫具有相似的组织嗜性，并感染了filament丝的多层上皮。感染细丝的组织学检查表明，具有多个芽的大疟原虫是由合并的小疟原虫形成的。除了上面的丝状上皮受到感染外，以上三种鱼类也被小的层内浆膜疟原虫感染。这些胞浆菌充满了在形态和季节发育上都类似于蟑螂内膜分支杆菌的孢子。 ide和asp的“内膜样”孢子的18S rDNA序列与宿主蟑螂中发现的孢子仅在一些碱基对上有所不同，并且被鉴定为属于内膜分枝杆菌。然而，在白鲷中发现的孢子与内膜分枝杆菌相比，DNA序列差异3.6-5.0％。因此，它们被描述为M. eirasianus sp.。十一月本文的目的是证明使用分子方法分离和鉴定形态上相对应或紧密相似的Myxobolus spp的重要性。

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