Phylogenetic analysis of the nucleotide sequences of 16S rRNA genes in the metagenomic community of Lubomirskia baicalensis has revealed taxonomic diversity of bacteria associated with the endemic freshwater sponge. Fifty-four operational taxonomic units (OTUs) belonging to six bacterial phyla (Actinobacteria, Proteobacteria (class α-Proteobacteria and β-Proteobacteria) Verrucomicrobia, Bacteroidetes, Cyanobacteria, and Nitrospira) have been identified. Actinobacteria, whose representatives are known as antibiotic producers, is the dominant phylum of the community (37%, 20 OTUs). All sequences detected shared the maximal homology with unculturable microorganisms from freshwater habitats. The wide diversity of bacteria closely coexisting with the Baikal sponge indicate the complex ecological relationships in the community formed under the unique conditions of Lake Baikal.
Russian Journal of Genetics – Springer Journals
Published: Aug 15, 2012
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