Genotipic characterization of virulence factors and agr of Staphylococcus aureus oxacillin sensitive / Caracterização genotípica dos fatores de virulência e seu regulador "agr" em cepas de "Staphylococcus aureus" sensíveis à oxacilina

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The capacity of the Staphylococcus aureus to escape from the immune system of the host is conferred to the existence of some exotoxins, which are codified by accessory genes. The expression of the genes of exotoxins is controlled by regulators, such as agr (acessory gene regulator), being identified four different types of this regulator. In this study, it had been used 37 strains of Staphylococcus aureus, sensible to the oxacillin, proceeding from public and private Brazilians laboratories. It had been used the PCR technique for detention of the genes of the virulence factors and the agr type present in each strain. The PFGE had been used for detectation of clonal relationship between the strains. Thus, it was observed that the most frequently determined gene coder of enterotoxin was sea (100% were related as type of agr III). it was observed divergent points to the studies carried through in other countries, like strains with coders genes of seb and tst (33%).This correlation, the literature judged not to be frequent, the same happening for the simultaneous presence of tst and lukE-lukD. It was not found in this study strains carrying of exfoliatin toxins. According to PFGE, there wasnt evidence of clonal relationship between the strains. It is concluded, therefore, that the molecular bases of the pathogenicity of the S. aureus are multifactorial, depending not only on the presence, as also of the expression of some accessory genes and the agr type present.

ASSUNTO(S)

staphylococcus aureus oxacillin sensitive staphylococcus aureus sensibilidade oxacilina fatores de virulência virulence factors

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