title: Characterization of vanA-containing Enterococcus faecium isolates carrying Tn5397-like and Tn916/Tn1545-like transposons in wild boars (Sus Scrofa).
abstract: The presence of vanA-containing Enterococcus faecium isolates was demonstrated in two of 67 fecal samples (3%) of healthy wild boars recovered in Portugal. One isolate per sample was studied further (E. faecium PG5V and PG48V). The mechanisms of resistance for other antibiotics were analyzed in these two vancomycin-resistant isolates, as well as the presence of genes related with virulence factors. The tet(M), tet(L), and erm(B) genes, associated with tetracycline or erythromycin resistance, were identified in both isolates, and the presence of aph(3')-IIIa gene (associated with kanamycin resistance) was detected in one of them. E. faecium PG48V exhibited an ampicillin minimum inhibitory concentration (MIC) of 64 microg/ml and showed eight amino acid substitutions in the carboxy-terminal end of the PBP5 protein (461Q --> K, 470H --> Q, 485M --> A, 496N --> K, 499A --> T, 525E --> D, 586V --> L, and 629E --> V) with respect to the reference sequence (GenBank accession number X84860). The purK-6 allele was identified in isolate PG48V, which also harbored the cylL(L)L(S), entA, and entB genes, encoding cytolysin, enterocin A, and enterocin B, respectively. The purK-3 allele was found in the PG5V isolate. The two vanA-containing isolates harbored the Tn916/Tn1545-like mobile element, and the Tn5397-like transposon was also found in isolate PG48V. The intestinal tract of wild boars could be a reservoir of vanA-containing enterococci.
authors.affiliation: University of Trás-os-Montes and Alto Douro, Veterinary Science Department, Vila Real, Portugal.
authors.forename: Patricia
authors.initials: P
authors.lastname: Poeta
authors.forename: Daniela
authors.initials: D
authors.lastname: Costa
authors.forename: Gilberto
authors.initials: G
authors.lastname: Igrejas
authors.forename: Beatriz
authors.initials: B
authors.lastname: Rojo-Bezares
authors.forename: Yolanda
authors.initials: Y
authors.lastname: Sáenz
authors.forename: Myriam
authors.initials: M
authors.lastname: Zarazaga
authors.forename: Fernanda
authors.initials: F
authors.lastname: Ruiz-Larrea
authors.forename: Jorge
authors.initials: J
authors.lastname: Rodrigues
authors.forename: Carmen
authors.initials: C
authors.lastname: Torres
mesh_terms: D000483:Alleles; D019943:Amino Acid Substitution / Q000235:genetics; D000818:Animals; D000835:Animals, Wild; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001426:Bacterial Proteins / Q000235:genetics*; D001430:Bacteriocins / Q000235:genetics; D019729:Carbon-Oxygen Ligases / Q000235:genetics*; D004251:DNA Transposable Elements; D004269:DNA, Bacterial; D004197:Disease Reservoirs; D024881:Drug Resistance, Bacterial / Q000235:genetics*; D016984:Enterococcus faecium / Q000235:genetics* / Q000302:isolation & purification / Q000472:pathogenicity; D005243:Feces / Q000382:microbiology; D041981:Gastrointestinal Tract / Q000382:microbiology; D008826:Microbial Sensitivity Tests; D054353:Perforin / Q000235:genetics; D011174:Portugal; D013552:Swine / Q000382:microbiology*; D020713:Vancomycin Resistance / Q000235:genetics; D037521:Virulence Factors / Q000235:genetics
chemical_list: D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D001430:Bacteriocins; D004251:DNA Transposable Elements; D004269:DNA, Bacterial; C071437:VanA ligase, Bacteria; D037521:Virulence Factors; C107799:enterocin A; C107801:enterocin B; D054353:Perforin; D019729:Carbon-Oxygen Ligases