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Multilocus sequence analysis of Porphyromonas gingivalis indicates frequent recombination
Andreas Koehler1, Helge Karch2, Thomas Beikler3
1Institut für Hygiene und Mikrobiologie der Bayerischen Julius-Maximilians-Universität, 97080 Würzburg, Germany.
Microbiology (Reading, England)
|September 2, 2003
Summary
Genetic analysis of Porphyromonas gingivalis isolates reveals significant recombination, indicating a panmictic population structure. This suggests frequent genetic exchange contributes to the heterogeneity observed in this periodontitis-associated bacterium.
Area of Science:
- Microbiology
- Genetics
- Oral Health
Background:
- Porphyromonas gingivalis is a key pathogen in periodontitis.
- Understanding its genetic diversity is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the genetic relationship and population structure of Porphyromonas gingivalis isolates from periodontitis patients.
- To determine the role of recombination in the genetic heterogeneity of P. gingivalis.
Main Methods:
- Multilocus sequence analysis of 10 chromosomal genes (ef-tu, ftsQ, hagB, gpdxJ, pepO, mcmA, dnaK, recA, pga, nah).
- Polymerase Chain Reaction (PCR) amplification and sequencing of internal DNA fragments.
- Phylogenetic analyses, split decomposition, homoplasy ratio calculation, and clustered polymorphism analysis.
Main Results:
- No two of the 19 P. gingivalis isolates were genetically identical across all 10 loci.
- Phylogenetic analyses indicated a panmictic population structure.
- Recombination plays a significant role in generating genetic diversity.
- The standardized index of association (0.0898) suggests genes are close to linkage equilibrium.
Conclusions:
- Porphyromonas gingivalis exhibits a panmictic population structure, driven by substantial recombination.
- Genetic exchange is a major factor contributing to the heterogeneity of P. gingivalis.
- These findings have implications for understanding the evolution and virulence of this oral bacterium.