Intestinal colonization of genotoxic Escherichia coli strains encoding colibactin and cytotoxic necrotizing factor in small mammal pets
| Autor: | Carolyn M. Madden, Niora J Fabian, Yan Feng, Anthony Mannion, James G. Fox |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Serotype
DNA Bacterial Male Cytolethal distending toxin Virulence Factors Bacterial Toxins Guinea Pigs Virulence Biology medicine.disease_cause Microbiology Article 03 medical and health sciences Feces Mice medicine Escherichia coli Animals Humans Gene Escherichia coli Infections Phylogeny 030304 developmental biology Disease Reservoirs Mammals 0303 health sciences General Veterinary 030306 microbiology Escherichia coli Proteins General Medicine Pets Sequence Analysis DNA In vitro Rats Intestines Diarrhea Polyketides Female Rabbits medicine.symptom Peptides Genome Bacterial HeLa Cells |
| Zdroj: | Vet Microbiol PMC |
| ISSN: | 1873-2542 |
| Popis: | © 2019 Elsevier B.V. Escherichia coli encoding colibactin (clb), cytolethal distending toxin (cdt), and hemolysin-associated cytotoxic necrotizing factor (cnf) are associated with various intestinal and extra-intestinal diseases in humans and animals. Small mammal pets are not evaluated for genotoxin-encoding E. coli. Thus, the prevalence of such strains is unknown. The objective of this study was to isolate and characterize genotoxin-encoding E. coli from healthy and ill small mammal pets examined at a veterinary clinic and at two animal adoption centers. E. coli isolates were cultured from fecal samples and biochemically characterized. A total of 65 animals, including mice, rats, rabbits, guinea pigs, and hedgehogs, were screened. Twenty-six E. coli isolates were obtained from 24 animals. Twelve of the 26 isolates (46.2 %) were PCR-positive for the pks genes clbA and clbQ. Two isolates (7.7 %) were PCR-positive for cnf. All isolates were PCR-negative for cdt. All genotoxin-encoding isolates belonged to the pathogen-associated phylogenetic group B2. Representative genotoxin-encoding isolates had serotypes previously associated with clinical disease in humans and animals. Isolates encoding pks or cnf induced megalocytosis and cytotoxicity to HeLa cells in vitro. Although most isolates were obtained from healthy pets, two guinea pigs with diarrhea had pks-positive isolates cultured from their feces. Whole genome sequencing on four representative isolates confirmed the presence of pks and cnf genes and identified other virulence factors associated with pathogenicity in animals and humans. Our results suggest that small mammalian pets may serve as a reservoir for potentially pathogenic E. coli and implicate a zoonotic risk. |
| Databáze: | OpenAIRE |
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