Filifactor alocis--involvement in periodontal biofilms

Area of Science:

• Microbiology
• Periodontology
• Oral Health

Background:

• Periodontal pockets harbor complex bacterial communities within biofilms, crucial for understanding disease pathogenesis.
• Filifactor alocis, a fastidious anaerobic bacterium, is increasingly identified in periodontal lesions and suggested as a marker for disease.
• Understanding the spatial organization and role of F. alocis in subgingival biofilms is vital for periodontal research.

Purpose of the Study:

• To investigate the prevalence of Filifactor alocis in periodontal pockets across different patient groups.
• To analyze the spatial arrangement and architectural contribution of F. alocis within in vivo subgingival biofilms.

Main Methods:

• Developed and validated a species-specific oligonucleotide probe (FIAL) for F. alocis detection.
• Utilized PCR and dot blot hybridization to analyze 490 subgingival plaque samples from generalized aggressive periodontitis (GAP), chronic periodontitis (CP), and control subjects.
• Employed a carrier system for in vivo biofilm collection from GAP patients, followed by fluorescence in situ hybridization for topographic analysis.

Main Results:

• Filifactor alocis was prevalent in patients with GAP and CP but rarely detected in controls.
• In biofilms from GAP patients, F. alocis was predominantly found in apical regions near soft tissues.
• The organism was integral to the architectural structures of subgingival periodontal biofilms.

Conclusions:

• Filifactor alocis plays a significant role in the pathogenetic structure of periodontal biofilms.
• The bacterium contributes to periodontal inflammation.
• F. alocis is a valuable marker organism for identifying periodontal disease.