Resistance Genes in Multiply-resistant Pseudomonas aeruginosa Clinical Isolates from Siriraj Hospital

Authors

  • Chanwit Tribuddharat Department of Microbiology, Faculty of Medicine Siriraj Hospital, Mahidol University
  • Michael A. Fennewald Department of Microbiology and Immunology, Finch University of the Health Sciences/ The Chicago Medical School

Keywords:

-

Abstract

The P. aeruginosa clinical isolates with multiple antibiotic resistance from Siriraj Hospital showed a region of closely related integron elements and transposons which carry at least 10 antibiotic resistance genes. The resistance genes from PaTh2 have been directly cloned and the genes have been sequenced within the total length of 26 kb. Resistance to aminoglycosides was conferred by three different aminoglycoside transferase genes, aadA2, aph, and aadB. Resistance to β-lactams was conferred by three different β-lactamases, blaPSE-1, blaCEF-1 (also called blaVEB-1), and blaOXA-10. Rifampin resistance was conferred by the arr-2 gene which encoded for a ribosylating transferase. Resistance to chloramphenicol was conferred by an active transport protein encoded by the cmlA gene. The resistance genes to quaternary ammonium compound and sulfonamide were also identified, qacEΔ1 and sul1, respectively. The arr-2 gene has been further analyzed to confirm rifampin resistance in laboratory strains of E. coli and P. aeruginosa. The CEF-1 β-lactamase has been purified for kinetic studies. The oxy-imino cephalosporins were good substrates for CEF-1 β-lactamase, whereas ampicillin was the poorest substrate. Most antibiotic resistance genes were located on gene cassettes as parts of two integron elements, and some were not cassettes but were connected to this region by unknown mechanisms of recombination. The adjacent transposon genes indicated the possibility of spread of this large collection of antibiotic resistance genes among other bacteria as seen in 4 other clinical isolates of P. aeruginosa. The sequence adjacent to the resistance cluster showed no homology to any sequence in the GenBank implying the cluster was not chromosomal in origin.

Downloads

Published

01-06-2002

How to Cite

Tribuddharat, C. ., & Fennewald, M. A. . (2002). Resistance Genes in Multiply-resistant Pseudomonas aeruginosa Clinical Isolates from Siriraj Hospital. Siriraj Medical Journal, 54(6), 319–329. Retrieved from https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/245260

Issue

Vol. 54 No. 6 (2002): June

Section

Original Article

License

Users are free to share, copy, and redistribute all articles published in the Siriraj Medical Journal (SMJ) in any medium or format as long as you follow the following terms:

  • Attribution — You must give appropriate credit, provide a link to the material, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the publisher endorses you or your use.
  • NonCommercial — You may not use the material for commercial purposes.
  • NoDerivatives — If you remix, transform, or build upon the material, you may not distribute the modified material.
  • No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.