Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/5505
Title: Characterization and distribution of drug resistance associated β-lactamase, membrane porin and efflux pump genes in MDR A. baumannii isolated from Zhenjiang, China
Authors: Yang, Huijian
Huang, Lan
Barnie, Prince Amoah
Su, Zhaoliang
Mi, Zuhuang
Chen, Jianguo
Aparna, Vasudevan
Kumar, Dinesh
Xu, Huaxi
Keywords: A.baumannii
Multidrug resistant
β-lactamase
Membrane porin
Efflux pump
Issue Date: 30-Sep-2015
Publisher: University of Cape Coast
Abstract: Background: Acinetobacter baumannii (A. baumannii), especially the multidrug resistant A. baumannii (MDR-AB) is becoming a common opportunistic pathogen in hospital, and constitutes significant public health threats. This study aimed at investigating the relationship between drug resistances with expression of class A-D β-lactamase genes, mutation in membrane porin and over-expression of effux pump genes among A. baumannii isolated from Zhengjiang, China. Methods: Antibiotic susceptibility assays were performed using Kirby-Bauer disc diffusion method. PCR was used to detect β-lactamase genes and carO, oprD, adeR, adeS. Real-time PCR was used to assess the mRNA expression level of efflux pump gene adeB. The software of DNAMAN was applied to assemble oprD and carO sequences, and the sequences were compared with those retrieved from GenBank (http://www. ncbi.nlm.nih.gov/). Results: 27 isolates (61.4%) in this study were MDR-AB, in which fve β-lactamases including TEM, CTX-M-2, ADC, OXA-23 and OXA-51 were found, and the positive rate was 96.3% (26), 14.8% (4), 92.6% (25), 88.9% (24) and 92.6% (25), respectively. In addition, the expression level of adeB mRNA was signifcantly increased in MDR-AB, it might due to adeR mutation. Some mutations were also found in carO and oprD. Conclusion: MDR-AB showed high relationship with β-lactamase, mutation in membrane porin and overexpression of adeB, which may directly relates to the mutation in regulating gene adeR
Description: 10p:, ill.
URI: http://hdl.handle.net/123456789/5505
ISSN: 23105496
Appears in Collections:Department of Biomedical & Forensic Sciences



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