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Antimicrobial Agents and Chemotherapy, April 2006, p. 1442-1448, Vol. 50, No. 4
0066-4804/06/$08.00+0     doi:10.1128/AAC.50.4.1442-1448.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Genetic Structures at the Origin of Acquisition and Expression of the Carbapenem-Hydrolyzing Oxacillinase Gene blaOXA-58 in Acinetobacter baumannii

Laurent Poirel and Patrice Nordmann*

Service de Bactériologie-Virologie, Hôpital de Bicêtre, Assistance Publique/Hôpitaux de Paris, Faculté de Médecine Paris-Sud, Université Paris XI, K.-Bicêtre, France

Received 17 October 2005/ Returned for modification 3 January 2006/ Accepted 3 February 2006

Genetic structures surrounding the carbapenem-hydrolyzing oxacillinase gene blaOXA-58 were characterized in a series of OXA-58-positive Acinetobacter baumannii strains isolated from different countries. We showed that in most of the cases, acquisitions of the blaOXA-58-containing overall structure, including insertion sequence elements, may be likely the results of recombination events. In type strain A. baumannii MAD, the genetic structure surrounding the blaOXA-58 gene was bracketed by two 27-bp repeated sequences. The isolation of a clonally related OXA-58-negative A. baumannii isolate that possessed the same plasmid backbone as A. baumannii MAD but lacked this genetic structure indicated that the mechanism of acquisition could be reversible. Parts of the structure identified in A. baumannii MAD were conserved in other blaOXA-58-positive isolates from various European countries. Primer extension experiments showed that blaOXA-58 expression was related to promoter sequences brought by different insertion sequence elements, such as an ISAba3-like element, ISAba1, ISAba2, and IS18. This work identified novel structures at the origin of acquisition and expression of a carbapenem-hydrolyzing ß-lactamase identified in non-clonally related A. baumannii isolates.

* Corresponding author. Mailing address: Service de Bactériologie-Virologie, Hôpital de Bicêtre, 78 rue du Général Leclerc, 94275 Le-Kremlin-Bicêtre Cedex, France. Phone: 33-1-45-21-36-32. Fax: 33-1-45-21-63-40. E-mail: nordmann.patrice{at}bct.ap-hop-paris.fr.

Antimicrobial Agents and Chemotherapy, April 2006, p. 1442-1448, Vol. 50, No. 4
0066-4804/06/$08.00+0     doi:10.1128/AAC.50.4.1442-1448.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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