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Structural and functional differences between disease-associated genes of enterohaemorrhagic Escherichia coli O111.
Int J Med Microbiol. 2007 Feb; 297(1):17-26.IJ

Abstract

We analysed 72 clinical isolates of enterohaemorrhagic Escherichia coli (EHEC) O111 from patients with diarrhoea or haemolytic uraemic syndrome (HUS) isolated during the period from 1955 to 2005 and identified six motile strains (flagellar antigens 8, 10 and 11); the remaining 66 (92%) were nonmotile (NM) and could not be typed by conventional H serotyping. To improve subtyping methodologies, we determined genotypes of the flagellin-encoding fliC. Three fliC genotypes were found which were identical to those of motile EHEC O111 with H antigens 8, 10 and 11 and designated fliC(H8), fliC(H10) and fliC(H11). The IS629 insertion element was present, identically located, in six epidemiologically unrelated isolates with fliC(H8). The prevalence of the fliC genotypes in the 72 EHEC O111 strains were fliC(H8) (89%), fliC(H10) (7%) and fliC(H11) (4%). Within these fliC genotypes, a high degree of homogeneity for the presence of disease-associated genes was found. The adhesins-encoding genes eae and efa-1 were present in all strains with fliC(H8) and fliC(H11), but absent from strains with fliC(H10). The latter strains have not been reported previously. Strains with fliC(H10) and fliC(H11), but not those with fliC(H8), retained intact cadA and cadC loci and decarboxylated lysine. Three different stx genotypes including stx(1), stx(2) and stx(1)/stx(2) were determined among the 72 EHEC O111. We observed a significant increase over time in the frequency of strains harbouring both stx(1) and stx(2). The presence of stx(2) both alone and in combination with stx(1) was significantly (chi(2)=23.16, P<0.00001, CI(95) [2.29; 9.76]) associated with HUS. Therefore, the emergence of EHEC O111 should be monitored carefully. We conclude that EHEC O111 strains can be differentiated using specific loci required for motility, adherence, Stx production, and lysine decarboxylation. The divergence within EHEC O111 makes it possible to subtype these emerging pathogens in the laboratory thereby providing a basis for further investigations into their ecological niches and survival capabilities.

Authors+Show Affiliations

Institute for Hygiene, and the National Consulting Laboratory on Haemolytic Uraemic Syndrome, University Hospital Münster, Robert Koch Strasse 41, D-48149 Münster, Germany.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17157559

Citation

Zhang, Wenlan, et al. "Structural and Functional Differences Between Disease-associated Genes of Enterohaemorrhagic Escherichia Coli O111." International Journal of Medical Microbiology : IJMM, vol. 297, no. 1, 2007, pp. 17-26.
Zhang W, Mellmann A, Sonntag AK, et al. Structural and functional differences between disease-associated genes of enterohaemorrhagic Escherichia coli O111. Int J Med Microbiol. 2007;297(1):17-26.
Zhang, W., Mellmann, A., Sonntag, A. K., Wieler, L., Bielaszewska, M., Tschäpe, H., Karch, H., & Friedrich, A. W. (2007). Structural and functional differences between disease-associated genes of enterohaemorrhagic Escherichia coli O111. International Journal of Medical Microbiology : IJMM, 297(1), 17-26.
Zhang W, et al. Structural and Functional Differences Between Disease-associated Genes of Enterohaemorrhagic Escherichia Coli O111. Int J Med Microbiol. 2007;297(1):17-26. PubMed PMID: 17157559.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Structural and functional differences between disease-associated genes of enterohaemorrhagic Escherichia coli O111. AU - Zhang,Wenlan, AU - Mellmann,Alexander, AU - Sonntag,Anne-K, AU - Wieler,Lothar, AU - Bielaszewska,Martina, AU - Tschäpe,Helmut, AU - Karch,Helge, AU - Friedrich,Alexander W, Y1 - 2006/12/08/ PY - 2006/06/14/received PY - 2006/10/09/revised PY - 2006/10/23/accepted PY - 2006/12/13/pubmed PY - 2007/3/23/medline PY - 2006/12/13/entrez SP - 17 EP - 26 JF - International journal of medical microbiology : IJMM JO - Int J Med Microbiol VL - 297 IS - 1 N2 - We analysed 72 clinical isolates of enterohaemorrhagic Escherichia coli (EHEC) O111 from patients with diarrhoea or haemolytic uraemic syndrome (HUS) isolated during the period from 1955 to 2005 and identified six motile strains (flagellar antigens 8, 10 and 11); the remaining 66 (92%) were nonmotile (NM) and could not be typed by conventional H serotyping. To improve subtyping methodologies, we determined genotypes of the flagellin-encoding fliC. Three fliC genotypes were found which were identical to those of motile EHEC O111 with H antigens 8, 10 and 11 and designated fliC(H8), fliC(H10) and fliC(H11). The IS629 insertion element was present, identically located, in six epidemiologically unrelated isolates with fliC(H8). The prevalence of the fliC genotypes in the 72 EHEC O111 strains were fliC(H8) (89%), fliC(H10) (7%) and fliC(H11) (4%). Within these fliC genotypes, a high degree of homogeneity for the presence of disease-associated genes was found. The adhesins-encoding genes eae and efa-1 were present in all strains with fliC(H8) and fliC(H11), but absent from strains with fliC(H10). The latter strains have not been reported previously. Strains with fliC(H10) and fliC(H11), but not those with fliC(H8), retained intact cadA and cadC loci and decarboxylated lysine. Three different stx genotypes including stx(1), stx(2) and stx(1)/stx(2) were determined among the 72 EHEC O111. We observed a significant increase over time in the frequency of strains harbouring both stx(1) and stx(2). The presence of stx(2) both alone and in combination with stx(1) was significantly (chi(2)=23.16, P<0.00001, CI(95) [2.29; 9.76]) associated with HUS. Therefore, the emergence of EHEC O111 should be monitored carefully. We conclude that EHEC O111 strains can be differentiated using specific loci required for motility, adherence, Stx production, and lysine decarboxylation. The divergence within EHEC O111 makes it possible to subtype these emerging pathogens in the laboratory thereby providing a basis for further investigations into their ecological niches and survival capabilities. SN - 1438-4221 UR - https://www.unboundmedicine.com/medline/citation/17157559/Structural_and_functional_differences_between_disease_associated_genes_of_enterohaemorrhagic_Escherichia_coli_O111_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1438-4221(06)00221-9 DB - PRIME DP - Unbound Medicine ER -