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Origin in Acinetobacter gyllenbergii and dissemination of aminoglycoside-modifying enzyme AAC(6')-Ih.
Yoon, Eun-Jeong; Goussard, Sylvie; Nemec, Alexandr; Lambert, Thierry; Courvalin, Patrice; Grillot-Courvalin, Catherine.
Afiliación
  • Yoon EJ; Institut Pasteur, Unité des Agents Antibactériens, Paris, France.
  • Goussard S; Institut Pasteur, Unité des Agents Antibactériens, Paris, France.
  • Nemec A; Laboratory of Bacterial Genetics, National Institute of Public Health, Prague, Czech Republic.
  • Lambert T; EA4043, Faculté de Pharmacie, Université Paris Sud, Châtenay-Malabry, France.
  • Courvalin P; Institut Pasteur, Unité des Agents Antibactériens, Paris, France patrice.courvalin@pasteur.fr.
  • Grillot-Courvalin C; Institut Pasteur, Unité des Agents Antibactériens, Paris, France.
J Antimicrob Chemother ; 71(3): 601-6, 2016 Mar.
Article en En | MEDLINE | ID: mdl-26645270
ABSTRACT

OBJECTIVES:

The aac(6')-Ih gene encoding aminoglycoside 6'-N-acetyltransferase type I subtype h [AAC(6')-Ih] is plasmid-borne in Acinetobacter baumannii where it confers high-level amikacin resistance, but its origin remains unknown. We searched for the gene in the genomes of a collection of 133 Acinetobacter spp. and studied its species specificity, expression and dissemination.

METHODS:

Gene copy number was determined by quantitative PCR, expression by quantitative RT-PCR, MIC by microdilution and transfer by plasmid mobilization.

RESULTS:

The aac(6')-Ih gene was present in the chromosome of the two Acinetobacter gyllenbergii of the collection and was detected in all seven A. gyllenbergii clinical isolates. They had indistinguishable flanking regions indicating that the gene was intrinsic to this species. A. baumannii PIS Aba23 promoters were provided by insertion of ISAba23, which disrupted the Pnative promoter in A. gyllenbergii. Both types of promoters were similarly potent in Escherichia coli and A. baumannii. Aminoglycoside MICs for A. baumannii harbouring pIP1858 were higher than for A. gyllenbergii due to gene dosage. The non-self-transferable plasmid could be mobilized to other A. baumannii cells by the broad host range plasmid RP4.

CONCLUSIONS:

We have found the origin of aac(6')-Ih in A. gyllenbergii, a species isolated, although rarely, in humans, and documented that dissemination of this gene is restricted to the Acinetobacter genus.
Asunto(s)

Texto completo: 1 Base de datos: MEDLINE Asunto principal: Acetiltransferasas / Farmacorresistencia Bacteriana / Acinetobacter baumannii / Aminoglicósidos / Antibacterianos Límite: Humans Idioma: En Revista: J Antimicrob Chemother Año: 2016 Tipo del documento: Article País de afiliación: Francia

Texto completo: 1 Base de datos: MEDLINE Asunto principal: Acetiltransferasas / Farmacorresistencia Bacteriana / Acinetobacter baumannii / Aminoglicósidos / Antibacterianos Límite: Humans Idioma: En Revista: J Antimicrob Chemother Año: 2016 Tipo del documento: Article País de afiliación: Francia