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Research Article 


An investigation of type 3 secretion toxins encoding-genes of Pseudomonas aeruginosa isolates in a University Hospital in Egypt

Awny A. Gawish, Nahla A Mohamed, Gehan A El-shennawy, Heba A. Mohamed.


Cited By:29

Abstract
Objective:Pseudomonas aeruginosa uses type 3 secretion system (T3SS) to directly inject four secretion toxins into host cells. The aim of the study was to determine the prevalence of thee secretion toxins-encoding genes among P. aeruginosa isolates collected from nosocomial infections and environmental sources.
Methods: Clonal relatedness of the studied P. aeruginosa isolates (n=85) was studied by RAPD typing. Multiplex PCR was performed on the 85 P. aeruginosa isolates (68 nosocomial isolates obtained from hospitalized patients present in different wards and departments, and 17 environmental isolates including 2 isolates from health-care worker hands from ICU) to detect the secretion toxins-encoding genes.
Results: RAPD fingerprinting demonstrated that most strains were of distinct genotypes and determined the presence of 54 RAPD patterns. The prevalence of the genes among all isolates was as follows; exoT-100%, exoS- 40%, exoY- 83.5% and exoU- 62.4%. No significant differences in the prevalence of these genes were observed between nosocomial and environmental isolates or between isolates cultured from different sites of infection. The part of P. aeruginosa strains harboring either exoS (37.6 %) or exoU (60 %) gene was significantly higher (P<0.001) than that contained both genes (2.4 %).
Concolusion: ExoT was present in all isolates and exoS, exoY and exoU are variable traits with exoU gene was the third in prevalence after exoT and exoY. No significant differences in exoS, exoY and exoU prevalence were observed between nosocomial and environmental isolates or between isolates cultured from different sites of infection. ExoS and exoU genes are mutually exclusive that almost all isolates contain either of both genes not both.


 
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How to Cite this Article
Pubmed Style

Gawish AA, Mohamed NA, El-shennawy GA, Mohamed HA. An investigation of type 3 secretion toxins encoding-genes of Pseudomonas aeruginosa isolates in a University Hospital in Egypt. J Microbiol Infect Dis. 2013; 3(3): 116-122 . doi:10.5799/jmid2013.03.0093

Web Style

Gawish AA, Mohamed NA, El-shennawy GA, Mohamed HA. An investigation of type 3 secretion toxins encoding-genes of Pseudomonas aeruginosa isolates in a University Hospital in Egypt. https://www.jmidonline.org/?mno=302656978 [Access: January 09, 2025]. doi:10.5799/jmid2013.03.0093

AMA (American Medical Association) Style

Gawish AA, Mohamed NA, El-shennawy GA, Mohamed HA. An investigation of type 3 secretion toxins encoding-genes of Pseudomonas aeruginosa isolates in a University Hospital in Egypt. J Microbiol Infect Dis. 2013; 3(3): 116-122 . doi:10.5799/jmid2013.03.0093


Vancouver/ICMJE Style

Gawish AA, Mohamed NA, El-shennawy GA, Mohamed HA. An investigation of type 3 secretion toxins encoding-genes of Pseudomonas aeruginosa isolates in a University Hospital in Egypt. J Microbiol Infect Dis. (2013), [cited January 09, 2025]; 3(3): 116-122 . doi:10.5799/jmid2013.03.0093


Harvard Style

Gawish, A. A., Mohamed, . N. A., El-shennawy, . G. A. & Mohamed, . H. A. (2013) An investigation of type 3 secretion toxins encoding-genes of Pseudomonas aeruginosa isolates in a University Hospital in Egypt. J Microbiol Infect Dis, 3 (3), 116-122 . doi:10.5799/jmid2013.03.0093


Turabian Style

Gawish, Awny A., Nahla A Mohamed, Gehan A El-shennawy, and Heba A. Mohamed. 2013. An investigation of type 3 secretion toxins encoding-genes of Pseudomonas aeruginosa isolates in a University Hospital in Egypt. Journal of Microbiology and Infectious Diseases, 3 (3), 116-122 . doi:10.5799/jmid2013.03.0093


Chicago Style

Gawish, Awny A., Nahla A Mohamed, Gehan A El-shennawy, and Heba A. Mohamed. "An investigation of type 3 secretion toxins encoding-genes of Pseudomonas aeruginosa isolates in a University Hospital in Egypt." Journal of Microbiology and Infectious Diseases 3 (2013), 116-122 . doi:10.5799/jmid2013.03.0093


MLA (The Modern Language Association) Style

Gawish, Awny A., Nahla A Mohamed, Gehan A El-shennawy, and Heba A. Mohamed. "An investigation of type 3 secretion toxins encoding-genes of Pseudomonas aeruginosa isolates in a University Hospital in Egypt." Journal of Microbiology and Infectious Diseases 3.3 (2013), 116-122 . Print. doi:10.5799/jmid2013.03.0093


APA (American Psychological Association) Style

Gawish, A. A., Mohamed, . N. A., El-shennawy, . G. A. & Mohamed, . H. A. (2013) An investigation of type 3 secretion toxins encoding-genes of Pseudomonas aeruginosa isolates in a University Hospital in Egypt. Journal of Microbiology and Infectious Diseases, 3 (3), 116-122 . doi:10.5799/jmid2013.03.0093


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