Multilocus sequence analysis of Porphyromonas gingivalis indicates frequent recombination.
In this study, the genetic relationship of 19 Porphyromonas gingivalis isolates from patients with periodontitis was investigated by multilocus sequence analysis. Internal 400-600 bp DNA fragments of the 10 chromosomal genes ef-tu, ftsQ, hagB, gpdxJ, pepO, mcmA, dnaK, recA, pga and nah were amplified by PCR and sequenced. No two isolates were identical at all 10 loci. Phylogenetic analyses indicated a panmictic population structure of P. gingivalis. Split decomposition analysis, calculation of homoplasy ratios and analyses of clustered polymorphisms all indicate that recombination plays a major role in creating the genetic heterogeneity of P. gingivalis. A standardized index of association of 0.0898 indicates that the P. gingivalis genes analysed are close to linkage equilibrium.
Koehler
Andreas
A
Institut für Hygiene und Mikrobiologie der Bayerischen Julius-Maximilians-Universität, 97080 Würzburg, Germany.
Karch
Helge
H
Institut für Hygiene, 48149 Münster, Germany.
Beikler
Thomas
T
Poliklinik für Parodontologie der Westfälischen Wilhelms-Universität, 48149 Münster, Germany.
Flemmig
Thomas F
TF
Poliklinik für Parodontologie der Westfälischen Wilhelms-Universität, 48149 Münster, Germany.
Suerbaum
Sebastian
S
Institut für Hygiene und Mikrobiologie der Bayerischen Julius-Maximilians-Universität, 97080 Würzburg, Germany.
Schmidt
Herbert
H
Institut für Hygiene und Mikrobiologie der Bayerischen Julius-Maximilians-Universität, 97080 Würzburg, Germany.
D002876:Chromosomes, Bacterial; D004269:DNA, Bacterial / Q000032:analysis; D005798:Genes, Bacterial; D018740:Genetic Heterogeneity; D008969:Molecular Sequence Data; D010802:Phylogeny; D011110:Polymorphism, Genetic; D016966:Porphyromonas gingivalis / Q000145:classification / Q000235:genetics* / Q000472:pathogenicity; D011995:Recombination, Genetic; D017422:Sequence Analysis, DNA
D004269:DNA, Bacterial