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JAC Advance Access published online on December 8, 2005
Journal of Antimicrobial Chemotherapy, doi:10.1093/jac/dki421
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© The Author 2005. Published by Oxford University Press on behalf of the British Society for Antimicrobial Chemotherapy. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received July 8, 2005
Revised October 13, 2005
Accepted October 21, 2005

Original article

Macrolide inactivation gene cluster mphA-mrx-mphR adjacent to a class 1 integron in Aeromonas hydrophila isolated from a diarrhoeic pig in Oklahoma

T. L. Poole 1 *, T. R. Callaway 1, K. M. Bischoff 2, C. E. Warnes 3, and D. J. Nisbet 1

1 USDA/ARS, Southern Plains Agricultural Research Center, 2881 F&B Road, College Station, TX 77845, USA
2 USDA/ARS, National Center for Agricultural Utilization Research, 1815 N. University Street, Peoria, IL 61604, USA
3 Biology Department, Ball State University, Muncie, IN 47306, USA

* To whom correspondence should be addressed.
T. L. Poole, E-mail: poole{at}ffsru.tamu.edu


  Abstract

Objectives: To characterize a multidrug-resistant Aeromonas hydrophila isolate (CVM861) that possesses a high-level macrolide inactivation gene cluster (mphA-mrx-mphR), previously only reported in Escherichia coli.

Methods: PCR fragment length mapping, gene sequencing and Southern blotting were used to map the mphA-mrx-mphR gene cluster and flanking elements in CVM861. Conjugation experiments were done to determine whether the multidrug resistance genetic element was mobile.

Results: The mphA-mrx-mphR gene cluster mapped downstream of a class 1 integron and upstream of an aph(3 ') gene, and was present on a Tn21-like element. The gene order determined by sequencing was intI1-dhfrXII-orfF-aadA2-qac{Delta}E-sul1-orf5{Delta}178-tnpA-mphR-mrx-mphA. Horizontal transmission of high-level macrolide resistance from CVM861 to E. coli 47011 was inconsistent; however, a composite plasmid possessing the mphA gene cluster was transferred at a conjugation frequency of 2.02 x 10-5 per recipient.

Conclusions: An mphA-mrx-mphR gene cluster was present downstream of the In2 integron located on a Tn21-like transposon in an A. hydrophila isolate. Whether this recombination event resulted in the truncation of the orf5 sequence is unknown. The presence of other resistance genes downstream of the mphA-mrx-mphR gene cluster suggests that multiple recombination events have occurred on this genetic element. This is the first known report of the mphA-mrx-mphR gene cluster carried by A. hydrophila and the first known isolation of this cluster in the United States.

Keywords: multidrug resistance; Tn21; transposons.
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