Related Experiment Videos
Immunomagnetic PCR and DNA probe for detection and identification of Porphyromonas gingivalis
R M Benkirane1, E Guillot, C Mouton
1Groupe de Recherche en Ecologie Buccale, Faculté de Médecine Dentaire, Université Laval, Québec, Canada.
Abstract:
The aim of the study that we describe was to combine an immunomagnetic separation and a PCR followed by dot blot hybridization with a DNA probe for the detection and identification of Porphyromonas gingivalis. Immunomagnetic particles were coated with monoclonal antibody specific for P. gingivalis and were incubated with a suspension containing seven oral bacterial species spiked with various dilutions of P. gingivalis. Beads with their load of bound bacterial were boiled in water, and the target DNA in the supernatant was amplified with a primer pair to generate a 593-bp PCR fragment specific for P. gingivalis. Finally, the product of amplification was detected by dot blot hybridization with a digoxigenin-labeled 593-bp probe. The detection limit was determined to be 100 bacterial cells per ml. The immunomagnetic-PCR/DNA probe procedure described here should be useful for the rapid, specific, and sensitive detection and identification of P. gingivalis in clinical samples.
Insights
This study introduces a rapid method for detecting Porphyromonas gingivalis (P. gingivalis) using immunomagnetic separation and PCR. The technique accurately identifies this bacterium in samples, offering a sensitive diagnostic tool.
Area of Science:
- Microbiology
- Molecular Biology
- Diagnostic Technology
Background:
- Porphyromonas gingivalis is a key pathogen in periodontitis.
- Accurate and rapid detection of P. gingivalis is crucial for timely diagnosis and treatment.
Purpose of the Study:
- To develop and validate a novel method for the specific detection and identification of P. gingivalis.
- To combine immunomagnetic separation with PCR and DNA probe hybridization for enhanced sensitivity.
Main Methods:
- Immunomagnetic particles coated with monoclonal antibodies against P. gingivalis were used for bacterial separation.
- Polymerase Chain Reaction (PCR) amplified a specific DNA fragment of P. gingivalis.
- Dot blot hybridization with a DNA probe confirmed the presence of the amplified product.
Main Results:
- The method achieved a detection limit of 100 bacterial cells per ml.
- The procedure demonstrated high specificity for P. gingivalis in mixed bacterial samples.
- Successful amplification and detection of P. gingivalis DNA were achieved.
Conclusions:
- The developed immunomagnetic-PCR/DNA probe assay is a rapid, specific, and sensitive method.
- This technique holds significant potential for the detection of P. gingivalis in clinical settings.
- The assay offers a valuable tool for microbiological diagnostics.