Serology of flagellar antigens from strains of enteropathogenic Escherichia coli (EPEC) and Shiga Toxin producing E. coli (STEC) isolated from different animals and comparative analysis of the fliC gene by PCR-RFLP. / Sorologia de antígenos flagelares de amostras de Escherichia coli Enteropatogênicas (EPEC) e E. coli produtoras da Toxina de Shiga (STEC) isoladas de diferentes animais e análise comparativa do gene fliC por PCR-RFLP.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The Escherichia coli species consists of a group of typically non-pathogenic bacteria present in the intestinal tract of humans and animals. Strains are serotyped according to their O (somatic), H (flagellar) and K (capsular) surface antigens, in order to distinguish these microorganisms from the non-pathogenic members of the intestinal microbiota. The flagellar antigen corresponding to the filament is formed by the polymerization of the flagellin, codified by the fliC gene. This study employed the PCR-RFLP technique to analyze flagellar antigen patterns from 112 EPEC and STEC strains. Fourteen strains have not amplified the fliC gene, 17 had their flagellar antigen determined only by the PCR-RFLP and 75 strains had their flagellar antigen confirmed by this technique. Three H antigens with irregular patterns were cloned and sequenced. After sequencing, insertions and deletions of nucleotides were discovered. So far, few studies used a significant number of STEC and EPEC strains originated from different animals to determine H antigens employing the PCR-RFLP technique of the fliC gene. According to the findings of this study, we assumed that PCR-RFLP of the fliC gene is faster, less laborious and more efficient than classic serotyping methodology.

ASSUNTO(S)

polymerase chain reaction (pcr) rflp escherichia coli rflp escherichia coli flagelina microbiology flic microbiologia reação em cadeia por polimerase (pcr) flagellin flic

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