Repository of Research and Investigative Information

Repository of Research and Investigative Information

Ilam University of Medical Sciences

DIVERSITY OF AMINOGLYCOSIDE MODIFYING ENZYME GENES AMONG MULTIDRUG RESISTANT ACINETOBACTER BAUMANNII GENOTYPES ISOLATED FROM NOSOCOMIAL INFECTIONS IN TEHRAN HOSPITALS AND THEIR ASSOCIATION WITH CLASS 1 INTEGRONS

Wed May 18 18:29:24 2022

(2011) DIVERSITY OF AMINOGLYCOSIDE MODIFYING ENZYME GENES AMONG MULTIDRUG RESISTANT ACINETOBACTER BAUMANNII GENOTYPES ISOLATED FROM NOSOCOMIAL INFECTIONS IN TEHRAN HOSPITALS AND THEIR ASSOCIATION WITH CLASS 1 INTEGRONS. Acta Microbiologica Et Immunologica Hungarica. pp. 359-370. ISSN 1217-8950

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Abstract

The aim of the present study was to investigate, for the first time, the diversity of the genes encoding aminoglycoside-modifying enzymes (AME) and their association with class 1 integrons in Iranian Acinetobacter baumannii strains. A total of 100 multidrug resistant A. baumannii, isolated from eight distinct hospitals in Tehran, were enrolled in this study. Susceptibility of these isolates to antimicrobial agents including gentamicin and amikacin was determined by E-test. Aminoglycoside resistant isolates were then tested by PCR for AME genes, including aphA6, aacC1, aacC2, aacA4, aadB, aadA1, classes 1 integron, 5'-CS-3' and typed by RAPD PCR. The rate of resistance to imipenem, meropenem, gentamicin and amikacin were 39, 39, 38 and 32, respectively. Intermediate resistance phenotype to gentamicin and amikacin was observed in 2 and 5 of all the isolates, respectively. After aph6 with 90 (n = 36/40), aadA1, aacC1 and aadB with 82.5 (n = 33/40), 65 (n = 26/40) and 20 (n = 8/40) were the most prevalent AME genes among aminoglycosides resistant A. baumannii isolates. A combination of two to four different resistance genes was observed in 39 of 40 strains (97.5), with a total of 7 different combinations. PCR of integrase genes revealed that AME gene was associated with 67 of class 1 integrons. RAPD analysis showed three predominant genotypes A (n = 20), B (n = 10) and 10 unrelated genotypes. The occurrence of identical resistance genes, gene combinations and class 1 integrons associated with these genes in clonally distinct strains indicates that horizontal gene transfer plays a major role in the dissemination of aminoglycoside resistance in A. baumannii.

Item Type: Article
Creators:
CreatorsEmail
Asadollahi, K.UNSPECIFIED
Taherikalani, M.UNSPECIFIED
Maleki, A.UNSPECIFIED
Alizadeh, E.UNSPECIFIED
Valadbaigi, H.UNSPECIFIED
Soroush, S.UNSPECIFIED
Maleki, H.UNSPECIFIED
Asadollahi, P.UNSPECIFIED
Emaneini, M.UNSPECIFIED
Keywords: AME genes aminoglycoside resistant A. baumannii Tehran medical-center carbapenemase emergence epidemic outbreak strains clones spp. Immunology Microbiology
Divisions:
Page Range: pp. 359-370
Journal or Publication Title: Acta Microbiologica Et Immunologica Hungarica
Journal Index: ISI
Volume: 58
Number: 4
Identification Number: https://doi.org/10.1556/AMicr.58.2011.4.11
ISSN: 1217-8950
Depositing User: مهندس مهدی شریفی
URI: http://eprints.medilam.ac.ir/id/eprint/814

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