Analysis of leukotoxin gene types of Actinobacillus actinomycetemcomitans in brazilians with aggressive periodontitis

Brazilian Journal of Microbiology

Wilson Rosalem Junior²  Rodrigo Carvalho De Souza¹  Arnaldo Feitosa Braga De Andrade²  Ana Paula Vieira Colombo¹ 

[1] ,Universidade Estadual do Rio de Janeiro Departamento de Microbiologia Rio de Janeiro RJ ,Brasil

关键词: generalized aggressive periodontitis;    PCR;    Actinobacillus actinomycetemcomitans;    saliva;    leukotoxin;    periodontite agressiva generalizada;    PCR;    Actinobacillus actinomycetemcomitans;    saliva;    leukotoxina;   

DOI  :  10.1590/S1517-83822006000200006

来源: SciELO

【 摘 要 】

Actinobacillus actinomycetemcomitans (Aa) is considered a major etiologic agent of aggressive periodontitis but this species has also been associated with other forms of periodontal disease. Further, highly leukotoxic strains are related to severity of disease. The purpose of this study was to determine the prevalence of Aa and the occurrence of the leukotoxin gene 530-bp deletion in patients with generalized aggressive periodontitis (GAP) from a Brazilian population. Thirty periodontally healthy and 29 GAP subjects participated in the study. Full-mouth periodontal examination including probing pocket depth (PPD), clinical attachment level (CAL), supragingival biofilm (SB) and bleeding on probing (BOP) was carried out at 6 sites/tooth for all subjects. Whole saliva samples were collected for bacterial DNA isolation. The detection of Aa and the presence of the 530-bp genetic deletion were determined directly in the samples by polimerase chain reaction. Differences on clinical and microbiological parameters between the two groups were sought using the Mann-Whitney, Fisher´s exact and Chi-square tests. Associations between clinical and microbiological parameters were tested using the Pearson correlation coefficient. Aa was detected significantly more often in GAP patients (96.6%) than healthy subjects (76.7%) (chi2 = 4.9; p < 0.05). The genetic deletion was observed in 16 of the 28 (57.1%) GAP patients who were positive for Aa. However, none of the samples from individuals with periodontal health presented this deletion (chi2 = 19.15; p < 0.001). Strong correlations between the presence of the deletion and PPD (r=0.312, p<0.05), CAL (r=0.409, p<0.01), SB (r=0.278, p<0.05) and BOP (r=0.406, p<0.01) were found. A high frequency of Aa was observed in Brazilians with GAP and periodontal health. However, the highly leukotoxic genotype was observed only in subjects with generalized aggressive disease.

【 授权许可】

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