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TosA, a putative repeats-in-toxin protein that has recently gained importance as an antigenic molecule, has characteristics of nonfimbrial adhesins and can act as a virulence marker in UPEC strains; however, little is known about the association of this protein with antibiotic resistance profiles in uropathogenic Escherichia coli (UPEC) tosA clinical strains. The aim of this study was to evaluate UPEC tosA strains, including examining genetic diversity, associations with phylogenetic groups, resistance profiles, virulence genes, adherence assays, integrons, and extended-spectrum beta-lactamase phenotypes. Pulsed-field gel electrophoresis analysis grouped these strains into eight clusters with 62% genetic diversity. These strains were mainly associated with the multidrug-resistant profiles, together with an association with class 1 integron and the extended-spectrum beta-lactamase phenotype. Additionally, the strains exhibited a distribution of ≥96% for core-associated genes, while a variable distribution was identified for pathogenic islands-associated genes. Strong associations between UPEC tosA strains and two phylogenetic groups (B2 and D) were identified, including resistance to β-lactam and non-β-lactam antibiotics. The UPEC tosA clinical strains exhibited major adherence, which was related to the fitness and virulence genes. A recombinant TosA protein reacted with antibodies from the sera of urinary tract infection patients, and anti-recombinant TosA polyclonal antibodies also detected TosA expression in these strains. In conclusion, strains of UPEC tosA belonging to phylogenetic group B2 had a high frequency of fitness and virulence genes associated with class 1 integrons and the extended-spectrum beta-lactamase phenotype, which exhibited a high adherence profile. The TosA protein is expressed during infection with UPEC and is considered an immunogenic molecule.
This article was published in the following journal.
Name: Microbial pathogenesis
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Strains of Escherichia coli that possess virulence traits which allow them to invade, colonize, and induce disease in tissues outside of the GASTROINTESTINAL TRACT. They are a cause of URINARY TRACT INFECTIONS (UROPATHOGENIC ESCHERICHIA COLI); neonatal MENINGITIS; SEPSIS; PNEUMONIA; and SURGICAL WOUND INFECTION.
Strains of Escherichia coli that preferentially grow and persist within the urinary tract. They exhibit certain virulence factors and strategies that cause urinary tract infections.
Strains of ESCHERICHIA COLI that are a subgroup of SHIGA-TOXIGENIC ESCHERICHIA COLI. They cause non-bloody and bloody DIARRHEA; HEMOLYTIC UREMIC SYNDROME; and hemorrhagic COLITIS. An important member of this subgroup is ESCHERICHIA COLI O157-H7.
Strains of ESCHERICHIA COLI characterized by attaching-and-effacing histopathology. These strains of bacteria intimately adhere to the epithelial cell membrane and show effacement of microvilli. In developed countries they are associated with INFANTILE DIARRHEA and infantile GASTROENTERITIS and, in contrast to ETEC strains, do not produce ENDOTOXINS.
A species of gram-negative, facultatively anaerobic, rod-shaped bacteria (GRAM-NEGATIVE FACULTATIVELY ANAEROBIC RODS) commonly found in the lower part of the intestine of warm-blooded animals. It is usually nonpathogenic, but some strains are known to produce DIARRHEA and pyogenic infections. Pathogenic strains (virotypes) are classified by their specific pathogenic mechanisms such as toxins (ENTEROTOXIGENIC ESCHERICHIA COLI), etc.
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