Prevalence of new candidate pathogens Prevotella baroniae, Prevotella multisaccharivorax and as-yet-uncultivated Bacteroidetes clone X083 in primary endodontic infections.
BACKGROUND
Culture-independent studies have revealed a broad spectrum of oral bacterial taxa that may be associated with disease. This study investigated the prevalence of three new candidate oral pathogens: Prevotella baroniae, Prevotella multisaccharivorax, and as-yet-uncultivated Bacteroidetes oral clone X083 in primary endodontic infections using a devised culture-independent approach.


METHODS
Genomic DNA was isolated from samples taken from 52 teeth with different forms of apical periodontitis and used as template in a taxon-specific 16S rRNA gene-based nested polymerase chain reaction assay to determine the prevalence of the 3 target taxa.


RESULTS
Bacteroidetes clone X083, P. baroniae, and P. multisaccharivorax were respectively detected in 81%, 43%, and 38% of the root canals of teeth associated with chronic apical periodontitis, in 60%, 40% and 40% of the canals of teeth with acute apical periodontitis, and in 14%, 24%, and 5% of the pus aspirates from acute apical abscesses. No targeted taxon was positively associated with abscesses or clinical symptoms. Overall, Bacteroidetes clone X083, P. baroniae, and P. multisaccharivorax were found in 50%, 35%, and 25% of the samples taken from primary endodontic infections, respectively.


CONCLUSIONS
Findings confirmed that the two newly named species and the uncultivated phylotype targeted in this study are associated with different forms of apical periodontitis, and a pathogenetic or at least an ecologic role is suspected.
Rôças
Isabela N
IN
Department of Endodontics, Faculty of Dentistry, Estácio de Sá University, Rio de Janeiro, RJ, Brazil.
Siqueira
José F
JF
D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000368:Aged; D001424:Bacterial Infections / Q000175:diagnosis*; D016866:Bacteroidaceae Infections / Q000175:diagnosis*; D041963:Bacteroidetes / Q000145:classification* / Q000235:genetics; D002908:Chronic Disease; D004269:DNA, Bacterial / Q000032:analysis; D003786:Dental Pulp Cavity / Q000382:microbiology; D003788:Dental Pulp Diseases / Q000382:microbiology*; D016680:Genome, Bacterial / Q000235:genetics; D006801:Humans; D008875:Middle Aged; D010482:Periapical Abscess / Q000382:microbiology; D010485:Periapical Periodontitis / Q000382:microbiology; D018720:Prevotella / Q000145:classification* / Q000235:genetics; D012329:RNA, Bacterial / Q000032:analysis; D012336:RNA, Ribosomal, 16S / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D055815:Young Adult
D004269:DNA, Bacterial; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S