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JAC Advance Access originally published online on January 28, 2005
Journal of Antimicrobial Chemotherapy 2005 55(3):367-370; doi:10.1093/jac/dkh543
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JAC vol.55 no.3 © The British Society for Antimicrobial Chemotherapy, 2005; all rights reserved

Characterization of a 2.6 kbp variable region within a class 1 integron found in an Acinetobacter baumannii strain isolated from a horse

Yvonne Abbott1,{dagger}, Rebecca O'Mahony2,{dagger}, Nola Leonard1, P. Joseph Quinn1, Tanny van der Reijden3, Lenie Dijkshoorn3 and Séamus Fanning2,*

1 Department of Veterinary Microbiology & Parasitology and 2 Centre for Food Safety, Faculty of Veterinary Medicine, University College Dublin, Belfield, Dublin 4, Ireland 3 Department of Infectious Diseases C5-P, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands

* Corresponding author. Tel: +353-1-716-6082; Fax: +353-1-716-6091; Email: sfanning{at}ucd.ie

Objectives: A complete gene cassette contained in a class 1 integron from a multidrug-resistant (MDR) isolate of Acinetobacter baumannii cultured from a horse was characterized by molecular methods.

Methods: Template genomic DNA purified from the A. baumannii isolate was investigated by PCR. A gene cassette-associated amplicon was detected and completely characterized.

Results: A 2.6 kbp DNA fragment containing four gene cassettes was amplified from the MDR A. baumannii isolate. Sequence analysis showed it was similar to sequences recently reported in Klebsiella pneumoniae, Serratia marcescens and an Escherichia coli plasmid p1658/97 which conferred aminoglycoside resistance. Aminoglycoside resistance-encoding genes aacC1 and aadA1 were located within the 2.6 kbp amplicon, separated by two open reading frames (ORFs) coding for unknown products. This cassette structure (and some variants) was identified in unrelated Acinetobacter spp. from human sources, based on sequence comparisons of the current databases.

Conclusions: Identification of a complete class 1 integron in an equine isolate of A. baumannii suggests that the screening of isolates from animals for these elements should be considered, as this information could influence the selection of chemotherapeutic agents.

Keywords: antimicrobial resistance , A. baumannii , integrons


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