Počet záznamů: 1  

Marine amoebae with cytoplasmic and perinuclear symbionts deeply branching in the Gammaproteobacteria

  1. 1.
    0467724 - BC 2017 RIV GB eng J - Článek v odborném periodiku
    Schulz, F. - Tyml, Tomáš - Pizzetti, I. - Dyková, I. - Fazi, S. - Kostka, Martin - Horn, M.
    Marine amoebae with cytoplasmic and perinuclear symbionts deeply branching in the Gammaproteobacteria.
    Scientific Reports. Roč. 5, 25 August (2015), č. článku 13381. ISSN 2045-2322. E-ISSN 2045-2322
    Grant CEP: GA ČR(CZ) GBP505/12/G112
    Institucionální podpora: RVO:60077344
    Klíčová slova: free-living amebas * bacterial endosymbionts * phylogenetic inference * Paramecium caudatum * Naegleria * gene expression * environment * chlamydiae * diversity * pathogens
    Kód oboru RIV: EG - Zoologie
    Impakt faktor: 5.228, rok: 2015

    Amoebae play an important ecological role as predators in microbial communities. They also serve as niche for bacterial replication, harbor endosymbiotic bacteria and have contributed to the evolution of major human pathogens. Despite their high diversity, marine amoebae and their association with bacteria are poorly understood. Here we describe the isolation and characterization of two novel marine amoebae together with their bacterial endosymbionts, tentatively named 'Candidatus Occultobacter vannellae' and 'Candidatus Nucleophilum amoebae'. While one amoeba strain is related to Vannella, a genus common in marine habitats, the other represents a novel lineage in the Amoebozoa. The endosymbionts showed only low similarity to known bacteria (85-88% 16S rRNA sequence similarity) but together with other uncultured marine bacteria form a sister clade to the Coxiellaceae. Using fluorescence in situ hybridization and transmission electron microscopy, identity and intracellular location of both symbionts were confirmed; one was replicating in host-derived vacuoles, whereas the other was located in the perinuclear space of its amoeba host. This study sheds for the first time light on a so far neglected group of protists and their bacterial symbionts. The newly isolated strains represent easily maintainable model systems and pave the way for further studies on marine associations between amoebae and bacterial symbionts.
    Trvalý link: http://hdl.handle.net/11104/0265765

     
     
Počet záznamů: 1  

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