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A New Species of the gamma-Proteobacterium Francisella, F. adeliensis Sp. Nov., Endocytobiont in an Antarctic Marine Ciliate and Potential Evolutionary Forerunner of Pathogenic Species
Umeå University, Faculty of Science and Technology, Department of Chemistry. Division of CBRN Defence and Security, Swedish Defence Research Agency, FOI, Umeå, Sweden.
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2019 (English)In: Microbial Ecology, ISSN 0095-3628, E-ISSN 1432-184X, Vol. 77, no 3, p. 587-596Article in journal (Refereed) Published
Abstract [en]

The study of the draft genome of an Antarctic marine ciliate, Euplotes petzi, revealed foreign sequences of bacterial origin belonging to the gamma-proteobacterium Francisella that includes pathogenic and environmental species. TEM and FISH analyses confirmed the presence of a Francisella endocytobiont in E. petzi. This endocytobiont was isolated and found to be a new species, named F. adeliensis sp. nov.. F. adeliensis grows well at wide ranges of temperature, salinity, and carbon dioxide concentrations implying that it may colonize new organisms living in deeply diversified habitats. The F. adeliensis genome includes the igl and pdp gene sets (pdpC and pdpE excepted) of the Francisella pathogenicity island needed for intracellular growth. Consistently with an F. adeliensis ancient symbiotic lifestyle, it also contains a single insertion-sequence element. Instead, it lacks genes for the biosynthesis of essential amino acids such as cysteine, lysine, methionine, and tyrosine. In a genome-based phylogenetic tree, F. adeliensis forms a new early branching clade, basal to the evolution of pathogenic species. The correlations of this clade with the other clades raise doubts about a genuine free-living nature of the environmental Francisella species isolated from natural and man-made environments, and suggest to look at F. adeliensis asa pioneer in the Francisella colonization of eukaryotic organisms.

Place, publisher, year, edition, pages
Springer, 2019. Vol. 77, no 3, p. 587-596
Keywords [en]
Endosymbiosis, Microbial associations, Polar microbiology, Environmental Francisella, Francisella phylogeny, Euplotes
National Category
Microbiology
Identifiers
URN: urn:nbn:se:umu:diva-158588DOI: 10.1007/s00248-018-1256-3ISI: 000464747100003PubMedID: 30187088OAI: oai:DiVA.org:umu-158588DiVA, id: diva2:1318349
Available from: 2019-05-27 Created: 2019-05-27 Last updated: 2019-05-27Bibliographically approved

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Sjödin, Andreas

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