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Abstract
Candidatus Syngnamydia salmonis (Chlamydiales, Simkaniaceae) was described as an epitheliocystis-causing bacterium from the gills of Atlantic salmon (Salmo salar) in Norway. A bacterium showing 99.2% 16S rRNA identity to Cand. S. salmonis is able to multiply in Paramoeba perurans and based on the classification criteria this bacterium could represent the same species as Cand. S. salmonis. Sequencing the genome of the cultured bacterium has made it possible to fulfill the minimal standards for genetic characterization of species within the order Chlamydiales. The complete rRNA genes, the amino acid sequences of SucA, PepF, Adk, HemL, DnaA, FtsK and FabI, are presented in addition to the morphology of the Chlamydia-like morphs in the cytoplasm of P. perurans.
Highlights
The phylum Chlamydiae consists of intracellular bacteria that show a biphasic developmental cycle in eukaryotic cells (Bedson and Bland 1932; Abdelrahman and Belland 2005; Horn 2008)
Paramoeba perurans was co-cultured with Candidatus Syngnamydia salmonis (Fig. 1a, b) but the cultures did not seem to be negatively affected by the presence of the bacterium
The majority of isolates of this amoeba obtained from farmed Atlantic salmon (Salmo salar) suffering from amoebic gill disease are positive for the presence of this Candidatus species
Summary
The phylum Chlamydiae consists of intracellular bacteria that show a biphasic developmental cycle in eukaryotic cells (Bedson and Bland 1932; Abdelrahman and Belland 2005; Horn 2008). They infect a wide range of different hosts including vertebrates, arthropods and amoeba, where they can be pathogens or endosymbionts. It was recommended that nine protein sequences should be used, in addition to the rRNA genes, to precisely classify newly discovered members of Chlamydiales at the family, genus and species levels (Pillonel et al 2015)
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