Molecular Relationship of vanA Glycopeptide Resistance Gene in Enterococci from Hospitalized Patients and Poultry in Korea / 감염
Korean Journal of Infectious Diseases
;
: 383-391, 2001.
Artículo
en Coreano
| WPRIM
| ID: wpr-34259
ABSTRACT
BACKGROUND:
Vancomycin-resistant enterococci (VRE) with vanA gene have been reported as a significant nosocomial pathogen. The vanA gene cluster (Tn1546) located on mobile DNA elements is known to be transferable from VRE to other enterococci. The purpose of this study was to investigate the genetic relationship between the vanA VRE strains isolated from hospitalizd patients and poultry.METHODS:
Total 145 isolates, including 58 E. faecium, 12 E. faecalis, 3 E. casseliflavus, and 4 E. gallinarum from humans and 68 E. faecium from poultry, were studied. Antimicrobial susceptibility tests were done by disk diffusion or agar dilution methods and molecular epidemiological analysis was performed by pulsed-field gel electrophoresis (PFGE). The internal and structural regions of vanA gene cluster were analyzed by PCR fragment length polymorphism, restriction enzyme, and sequencing of Orf2D region and vanXY intergenic region. The point mutation at Tn1546 nucleotide position 8234 (G->T) within the vanX gene was screened with DdeI restriction enzyme.RESULTS:
The antibiotic resistance patterns of human isolates were different from those of poultry. PFGE patterns revealed high heterogeneity. Three PCR fragment length patterns in the vanA gene cluster were found (I) PCR amplicon of the same size as prototype (E. faecium BM4147) in 17% of human isolates and 100% of poultry ones; (II) PCR amplicon for vanXY intergenic region due to an insertion between vanX and vanY genes in 2.5% of human isolates; (III) the insertions in vanX-vanY intergenic and Orf2 regions in 81% of human isolates. The T type in vanX gene of human and poultry isolates was not found.CONCLUSION:
Despite the diverse PFGE patterns, 81% of human and all of poultry isolates belonged to vanA gene cluster type III and I, respectively. These results indicate that the horizontal spread of vanA gene is occurring among genetically diverse strains of VRE in Korea.
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Asunto principal:
Aves de Corral
/
Características de la Población
/
ADN
/
Farmacorresistencia Microbiana
/
Familia de Multigenes
/
Reacción en Cadena de la Polimerasa
/
Electroforesis en Gel de Campo Pulsado
/
Mutación Puntual
/
ADN Intergénico
/
Agar
Límite:
Humanos
País/Región como asunto:
Asia
Idioma:
Coreano
Revista:
Korean Journal of Infectious Diseases
Año:
2001
Tipo del documento:
Artículo
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