Journal
ENVIRONMENTAL MICROBIOLOGY
Volume 11, Issue 4, Pages 1016-1026Publisher
WILEY
DOI: 10.1111/j.1462-2920.2008.01837.x
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Funding
- European Union [QLRT-2001-02493]
- Federal Ministry for Science and Education (BMBF) [0313751K]
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Molecular signatures of new, as yet uncultured mollicute-like organisms (MLOs) have been detected in total rRNA and DNA extracted from tissues, gut contents and casts of four species of the earthworm family Lumbricidae. The MLO 16S rRNA sequences exhibited low identity to those of known Mollicutes species and formed a monophyletic cluster distantly affiliated to the 'Candidatus Bacilloplasma' (84.9%) and almost equidistant to the other main phylogenetic group of Mollicutes (< 79.8%) and the classes Bacilli (< 79.5%) and Clostridia (< 76.1%). SSCP profiling and sequence analysis of bands and bacterial clones derived from the earthworms and substrata revealed high phylogenetic relatedness of MLOs in earthworms from different geographic locations (Russia and Germany), with no obvious host species specificity being observed. Fluorescence in situ hybridization (FISH) analysis with a nucleotide probe specific for the new MLO group localized them to the coelomic fluids of earthworms. A new taxonomic group within the Mollicutes, designated 'Candidatus Lumbricincola', is proposed to include these as yet uncultured organisms.
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