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The structure of the intestinal microbiota of the intestine and the frequency of detection of pathogenicity genes (stx1, stx2, bfp) in Escherichia coli with normal enzymatic activity isolated from children during the first year of life

Abstract

E. coli is an intestinal commensal of vertebrates. The ability to produce Shiga toxins (STX) is an important characteristic of the virulence feature of the Shiga toxin that is produced by E. coli (STEC). These potent cytotoxins block protein synthesis by inactivating ribosomes. Their action on the target cells is responsible for the most severe forms of STEC-induced disease, such as hemorrhagic colitis and the life-threatening hemolytic-uremic syndrome (HUS). Enteropathogenic E. coli (EPEC) also continues to be an important cause of infantile diarrhea in developing countries. Bundle-forming pili (bfp) are essential for the full virulence of enteropathogenic E. coli. Exchange of genetic material between different types of bacteria, as well as with other members of the family Enterobacteriaceae in the intestinal ecosystem, leads to the appearance of normal variants of E. coli with phenetic features of pathogenicity that can serve as a theoretical basis for attributing these strains to pathobionts. PCR was used to examine 68 strains of E. coli (E. coli with normal enzymatic activity) for the presence of genes encoding the synthesis of Shiga toxins (stx1 and stx2) and genes encoding the bundle-forming pilus (bfp). They were isolated from children with functional disorders of the gastrointestinal tract. The presence of the desired amplicon specific for stx1 and bfp genes has resulted in the formation of E. coli strains with more intense pathogenicity.

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Correspondence to E. I. Ivanova.

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Original Russian Text © E.I. Ivanova, L.V. Rychkova, U.M. Nemchenko, E.V. Bukharova, M.V. Savelkaeva, Yu.P. Dzhioev, 2017, published in Molekulyarnaya Genetika, Mikrobiologiya i Virusologiya, 2017, No. 1, pp. 36–40.

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Ivanova, E.I., Rychkova, L.V., Nemchenko, U.M. et al. The structure of the intestinal microbiota of the intestine and the frequency of detection of pathogenicity genes (stx1, stx2, bfp) in Escherichia coli with normal enzymatic activity isolated from children during the first year of life. Mol. Genet. Microbiol. Virol. 32, 42–48 (2017). https://doi.org/10.3103/S0891416817010062

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Keywords

  • microbiocenosis
  • gastrointestinal tract
  • microsymbiont
  • Escherichia coli
  • Shiga toxin
  • stx-phages
  • pathogenicity genes
  • bundle-forming pilus gene