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Analysis of genotypic variation in genes associated with virulence in Aggregatibacter actinomycetemcomitans clinical isolates

Artikel i vetenskaplig tidskrift
Författare ET Pinheiro
C Ota-Tsuzuki
LRS Almeida
ACR Nunes
PL Longo
Maude Wikström
MPA Mayer
Publicerad i Journal of Periodontal Research
Volym 46
Nummer/häfte 3
Sidor 310 - 317
ISSN 1600-0765
Publiceringsår 2011
Publicerad vid Institutionen för odontologi
Sidor 310 - 317
Språk en
Länkar dx.doi.org/10.1111/j.1600-0765.2011...
Ämnesord Aggregatibacter actinomycetemcomitans; virulence factors; periodontitis pathogenesis; genotyping; serotyping
Ämneskategorier Cell- och molekylärbiologi

Sammanfattning

Abstract Background and Objective:  Although certain serotypes of Aggregatibacter actinomycetemcomitans are associated more with aggressive periodontitis than are other serotypes, the correlation between distinct lineages and virulence traits in this species is poorly understood. This study aimed to evaluate the polymorphism of genes encoding putative virulence factors of clinical isolates, and to correlate these findings with A. actinomycetemcomitans serotypes, genotypes and periodontal status of the hosts. Material and Methods:  Twenty-six clinical isolates from diverse geographic populations with different periodontal conditions were evaluated. Genotyping was performed using pulse-field gel electrophoresis. Polymorphisms in the genes encoding leukotoxin, Aae, ApaH and determinants for serotype-specific O polysaccharide were investigated. Results:  The isolates were classified into serotypes a–f, and exhibited three apaH genotypes, five aae alleles and 25 macrorestriction profiles. Two serotype b isolates (7.7%), obtained from Brazilian patients with aggressive periodontitis, were associated with the highly leukotoxic genotype; these isolates showed identical fingerprint patterns and aae and apaH genotypes. Serotype c, obtained from various periodontal conditions, was the most prevalent among Brazilian isolates, and isolates were distributed in two aae alleles, but formed a genetically distinct group based on apaH analysis. Cluster analysis showed a close relationship between fingerprinting genotypes and serotypes/apaH genotypes, but not with aae genotypes. Conclusion:  Apart from the deletion in the ltx promoter region, no disease-associated markers were identified. Non-JP2-like strains recovered from individuals with periodontal disease exhibited considerable genetic variation regarding aae/apaH genotypes, serotypes and XhoI DNA fingerprints.

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