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Microdiversification of a Pelagic Polynucleobacter Species Is Mainly Driven by Acquisition of Genomic Islands from a Partially Interspecific Gene Pool

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    0480485 - BC 2018 RIV US eng J - Článek v odborném periodiku
    Hoetzinger, M. - Schmidt, J. - Jezberová, Jitka - Koll, U. - Hahn, M.W.
    Microdiversification of a Pelagic Polynucleobacter Species Is Mainly Driven by Acquisition of Genomic Islands from a Partially Interspecific Gene Pool.
    Applied and Environmental Microbiology. Roč. 83, č. 3 (2017), č. článku e02266-16. ISSN 0099-2240. E-ISSN 1098-5336
    Institucionální podpora: RVO:60077344
    Klíčová slova: Polynucleobacter * ecophysiology * environmental genomics * functional diversity
    Obor OECD: Microbiology
    Impakt faktor: 3.633, rok: 2017

    Microdiversification of a planktonic freshwater bacterium was studied by comparing 37 Polynucleobacter asymbioticus strains obtained from three geographically separated sites in the Austrian Alps. Genome comparison of nine strains revealed a core genome of 1.8 Mb, representing 81% of the average genome size. Seventy-five percent of the remaining flexible genome is clustered in genomic islands (GIs). Twenty-four genomic positions could be identified where GIs are potentially located. These positions are occupied strain specifically from a set of 28 GI variants, classified according to similarities in their gene content. One variant, present in 62% of the isolates, encodes a pathway for the degradation of aromatic compounds, and another, found in 78% of the strains, contains an operon for nitrate assimilation. Both variants were shown in ecophysiological tests to be functional, thus providing the potential for microniche partitioning. In addition, detected interspecific horizontal exchange of GIs indicates a large gene pool accessible to Polynucleobacter species. In contrast to core genes, GIs are spread more successfully across spatially separated freshwater habitats. The mobility and functional diversity of GIs allow for rapid evolution, which may be a key aspect for the ubiquitous occurrence of Polynucleobacter bacteria.
    Trvalý link: http://hdl.handle.net/11104/0276263

     
     
Počet záznamů: 1  

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