Journal Article

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

Yvonne Abbott, Rebecca O'Mahony, Nola Leonard, P. Joseph Quinn, Tanny van der Reijden, Lenie Dijkshoorn and Séamus Fanning

in Journal of Antimicrobial Chemotherapy

Published on behalf of British Society for Antimicrobial Chemotherapy

Volume 55, issue 3, pages 367-370
Published in print March 2005 | ISSN: 0305-7453
Published online March 2005 | e-ISSN: 1460-2091 | DOI:
Characterization of a 2.6 kbp variable region within a class 1 integron found in an Acinetobacter baumannii strain isolated from a horse

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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

Journal Article.  1953 words.  Illustrated.

Subjects: Medical Oncology ; Critical Care

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