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Clinical Oral Investigations

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01-09-2016 | Original Article

Characterization of A. actinomycetemcomitans strains in subgingival samples from periodontitis subjects in Morocco

Authors: M. Mínguez, O. K. Ennibi, X. Pousa, L. Lakhdar, L. Abdellaoui, M. Sánchez, M. Sanz, D. Herrera

Published in: Clinical Oral Investigations | Issue 7/2016

Abstract

Objective

Aggregatibacter actinomycetemcomitans, specially its highly leucotoxic strain (JP2 clone), represents an etiological factor for the onset and progression of aggressive types of periodontitis. The aims of this investigation were to investigate the most relevant periodontal pathogens in the subgingival microbiota of periodontitis patients from Morocco and to describe the clinical and microbiological characteristics of subjects positive for A. actinomycetemcomitans, including serotype, leukotoxin gene, and operon of the cytolethal distending toxin (cdt) distribution.

Material and methods

In consecutive Moroccan subjects diagnosed of periodontitis, subgingival samples were taken and processed by culture. From the positive samples for A. actinomycetemcomitans, one to three isolates were subcultured and characterized by means of polymerase chain reaction (PCR), assessing their specific serotype distribution, the variation in the sequences of the leukotoxin gene, and the operon of the cdt.

Results

Twenty-one (35.6 %) out of 59 periodontitis patients harbored A. actinomycetemcomitans. These patients demonstrated statistically significant deeper pockets (p = 0.035) and higher proportions of P. micra (p = 0.045) than did the negative group. The 39 studied isolates were serotype “b”; in 16 out of 17 patients, there was mono-colonization with this serotype. Five isolates, from two patients, presented the 530-bp deletion in the leukotoxin’s promoter region. Thirty-two isolates (78 % of the strains) were cdt-positive.

Conclusion

A. actinomycetemcomitans was frequently found (35.6 %) in our sample. All strains were serotype “b,” and most (78 %) were also cdt-positive. The JP2 strain type was only detected in 12.2 % of the strains.

Clinical relevance

A. actinomycetemcomitans can be frequently found in Morocco. This fact can influence the therapeutic approach of this type of patients.

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Title: Characterization of A. actinomycetemcomitans strains in subgingival samples from periodontitis subjects in Morocco
Authors: M. Mínguez
O. K. Ennibi
X. Pousa
L. Lakhdar
L. Abdellaoui
M. Sánchez
M. Sanz
D. Herrera
Publication date: 01-09-2016
Publisher: Springer Berlin Heidelberg
Published in: Clinical Oral Investigations / Issue 7/2016
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-015-1653-7

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Characterization of A. actinomycetemcomitans strains in subgingival samples from periodontitis subjects in Morocco

Abstract

Objective

Material and methods

Results

Conclusion

Clinical relevance

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Objective

Material and methods

Results

Conclusion

Clinical relevance

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