Marteilia refringens is one of the most significant pathogens of bivalve molluscs. Previous sequencing of the small subunit ribosomal RNA gene of M. refringens isolates derived from the infected mussels (Mytilus edulis and Mytilus galloprovinciallis) and the oyster (Ostrea edulis) in Europe did not reveal genetic polymorphisms despite indications from epizootiological data that distinct types may exist. We investigated the existence of polymorphisms in the internal transcribed spacer region of the ribosomal RNA genes. The sequences of this region proved to be clearly dimorphic among Marteilia from five sampling sites. The distribution of the two genetic types, named "O" and "M", appeared to be linked to the host species, oysters and mussels, respectively. We therefore support the recognition of two species of Marteilia in Europe and propose that the "O" type corresponds to M. refringens and the "M" type to M. maurini.

译文

:Marterilia refringens是双壳软体动物最重要的病原体之一。尽管从流行病学数据表明可能存在不同类型的感染,但欧洲感染的贻贝(Mytilus edulis和Mytilus galloprovinciallis)和牡蛎(Ostrea edulis)分离的致盲支气单胞菌小亚基核糖体RNA基因的先前测序未揭示遗传多态性。 。我们调查了核糖体RNA基因的内部转录间隔区中多态性的存在。在五个采样点的Marteilia中,该区域的序列被证明是明显二态的。两种遗传类型的分布,分别命名为“ O”和“ M”,似乎分别与宿主物种牡蛎和贻贝有关。因此,我们支持欧洲对两种Marteilia物种的认可,并建议“ O”类型对应于麻黄分枝杆菌,“ M”类型对应于毛利尼分枝杆菌。

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