Investigation of antibiotic resistance genes and class 1 integron in multi-drug resistant P. aeruginosa and E. coli strains

P. aeruginosa and E. coli are resistant to many antibiotics, so the treatment of infections of these pathogens has become difficult. Therefore, searching for the presence of antibiotic resistance genes in clinical isolates is of great importance. The purpose of this study is to investigate the presence of beta-lactam resistance genes and class 1 integron in multi-drug resistant P. aeruginosa and E. coli clinical strains. Vitek 2 Compact automatization system were used for identification and antibiogram of 2 P. aeruginosa and 2 E. coli isolates which were isolated from blood, urine and sputum specimens of patients whom were hospitalized in Gümüşhane State Hospital intensive care unit. Total DNA isolation was done by boiling DNA method. PCR were performed using primers of class 1 integron gene cassette, blaVIM, blaNDM, blaIMP, blaGES, blaCTXM-1, blaCTXM-2, blaOXA-58, blaOXA-23, blaOXA-51, blaOXA-40 and blaKPC. All amplification samples were performed on 1% agarose gel and subsequently visualized under UV light. According to the results of the antibiogram, P. aeruginosa isolates showed resistance against all used antibiotics except gentamicin. The E. coli isolates were found to be resistant to cephalosporin antibiotics and susceptible to carbapenems. blaCTXM-1-class A beta lactamase genes was found in 3 strains of 4, while no blaCTXM-2, blaGES and blaKPC genes were detected in the strains. The presence of the investigated class B and class D beta lactamase genes was not observed in any sample. The presence of class 1 integron was detected in 3 strains. According to the result of the DNA sequence analysis, it was determined that three integron positive samples had the dfrA1/AadA5 gene cassettes.