Summary auto-generated
Researchers developed a suite of four 16s rRNA-targeted oligonucleotide probes to identify and study bacteria from the cytophaga-flavobacter-bacteroides (CFB) phylum in natural environments. Probes CF319a and CF319b target the flavobacteria-cytophaga group and Porphyromonas species, probe BAC303 targets Prevotella and Bacteroides, and probe FFE8b specifically targets Flavobacterium ferrugineum. The probes were designed using computer-assisted sequence analysis and validated through whole-cell and dot-blot hybridization against reference strains from across the CFB phylum and other bacterial lineages. When applied to environmental samples using fluorescent in situ hybridization, the probes successfully identified flavobacteria-cytophaga members as significant constituents of activated sludge flocs and characteristic colonizers of filamentous bacteria. The BAC303 probe was also used to visualize Bacteroides and Prevotella in human fecal samples without requiring anaerobic cultivation, demonstrating the practical utility of these molecular tools for studying previously unculturable microbial communities in complex environments.
Key findings
- Four new 16s rRNA-targeted oligonucleotide probes were successfully designed and validated for identifying specific groups within the CFB phylum
- Probes CF319a and CF319b showed high specificity for the flavobacteria-cytophaga group, with CF319a matching >90% of sequences in this group
- Probe BAC303 demonstrated 100% sequence similarity only to Bacteroides and Prevotella genera
- Fluorescent in situ hybridization using these probes revealed flavobacteria-cytophaga members as major components of activated sludge and human fecal microflora
This summary was generated automatically from the article PDF and is not part of the original publication. Refer to the PDF for the authoritative text.
Abstract
We designed a panel of four 16S rRNA-targeted oligonucleotide probes specific for bacteria of the phylum cytophaga-flavobacter-bacteroides (CFB). Probes CF319a and CF319b are targeted to members of the flavobacteria-cytophaga group and the genus Porphyromonas, whereas probe BAC303 has a target region characteristic for the genera Prevotella and Bacteroides within the bacteroides group. The probe FFE8b was developed for species-specific hybridizations with Flavobacterium ferrugineum. All probes were designed by computer- assisted sequence analysis and compared to all currently accessible 16S and 23S rRNA sequences. The oligonucleotides were further evaluated by whole-cell and non-radioactive dot-blot hybridization against reference strains of the CFB phylum and other major lineages of Bacteria. The newly developed probes were used together with other higher-order probes to analyse the structure and community composition in complex environments. In activated sludge samples, members of the flavobacteria- cytophaga group were revealed by in situ hybridization as important constituents of sludge flocs and characteristic colonizers of filamentous bacteria. By application of fluorescent probe BAC303, members of the genera Bacteroides and Prevotella could be visualized without prior cultivation as an important part of the human faecal microflora.