A. actinomycetemcomitans profile and red complex bacterial species of an Afro-Brazilian community: A comparative study

Made available in DSpace on 2019-09-12T16:53:33Z (GMT). No. of bitstreams: 0 Previous issue date: 2015 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Purposes: The primary aim of this cross-sectional study was to compare the levels of red complex bacteria between Afro-Brazilian and non Afro-Brazilian cohort. The secondary aim was to compare the distribution of both Aggregatibacter actinomycetemcomitans serotype b and its JP2 strains among participants who harboured this bacterial species. Methods: A total of 84 individuals were included in this study: 42 Afro-descendants (mean age 35.9 +/- 13.1 years) and 42 non-Afro-descendants (mean age 36.2 +/- 13.1 years) matched (1:1) by periodontal diagnosis, age and gender. All participants received clinical examinations of periodontal pocket depth, clinical attachment level, and plaque and gingival indices. Subgingival samples were taken for microbial analysis. First, genomic DNA (gDNA) was extracted and purified and the quantification of total number of bacterial cells, A. actinomycetemcomitans, Porphyromonas gingivalis, Tannerella forsythia and Treponema denticola was carried out by qPCR. Then, A. actinomyceterncomitans strains were classified according to serotype b and JP2 profiles by conventional PCR. Results: Clinically, mean PD, mean CAL and percentage of CAL >= 3 mm differed between groups (Student's t-test p < 0.05). The levels Of red complex bacteria between Afro-Brazilian and non-Afro-Brazilian populations were similar. The exception was verified to A. actinomycetemcomitans showing significantly higher levels among Afro-Brazilian descendants in comparison to non-Afro-Brazilian descendants. Afro-Brazilian descendants were clearly infected by more virulent serotype b and JP2 strains. Conclusions: Despite no statistically significant differences related to the red complex species, Afro-Brazilian descendants harboured higher levels of A. actinomycetemcomitans. Also, our findings confirm that Afro-descendant populations are preferably colonised by A. actinomycetemcomitans serotype b as well as JP2 strains. (C) 2015 Elsevier Ltd. All rights reserved. [Neris, Murilo de Araujo] Universidade de Taubaté (Unitau), Sch Dent, Dept Periodontol [Cortelli, Sheila Cavalca; Aquino, Davi Romeiro; Cortelli, Jose Roberto] Universidade de Taubaté (Unitau), Sch Dent, Nucleus Periodontal Res [de Miranda, Tais Browne] Universidade de Taubaté (Unitau), Dept Biol [Costa, Fernando de Oliveira] Univ Fed Minas Gerais, Sch Dent, Periodontal Dept, BR-31270901 Belo Horizonte, MG, Brazil