Study Gene Expression of OXA-48and CTX-M-1 Genes Cephalosporin resistance in Escherichia coli isolated from urinary tract infections in Baghdad hospitals

Abstract

Escherichia coli are a normal flora in the human. It is pathogenic in patients with immune system disorders and is the leading cause of enteritis, urinary tract infection, septicemia and other medical infections. E. coli is the most common cause of community and hospital-acquired urinary tract infections (UTIs). It is responsible for >80% of all cases of UTI. These study samples were taken from Al-Karama Teaching Hospital and Al-Yarmouk Teaching Hospital in Baghdad. This study aimed to determine the Minimum Inhibition concentration (MIC) of Ceftazidim. As well as comparing the effect of antibiotics and without antibiotics on beta-lactam genes (OXA-48 –CTXM-1) resistance to Cephalosporin where there is an overexpression of gene expression in the antibiotic between (125-64) µg/ml. Bacteria produce beta-lactam enzymes that break down the beta-lactam ring in the antibiotic, which reduces the effectiveness of antibiotics. This mechanism is one of the mechanisms of resistance in bacteria. The presence of both genes increases the resistance of this species to Cephalosporin. The results of gene expression when treated with antibiotics for the OXA-48 gene in his sample were 1.4, and the highest value was 14.5, as well as for the CTX-M-1 gene, where the results ranged between the lowest value of 1.3 and the highest value of 7.3 when compared to the control samples, we notice an overexpression of gene. It was concluded that the resistance of E. coli to Ceftazidim was related to the genes blaOXA45 and CTXM-1, but the primary role may be due to blaOXA45. Keywords: Gene Expression, OXA-48 Gene, CTX-M-1 Gene, Cephalosporin, Escherichia coli.