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Integron mediated antimicrobial resistance in diarrheagenic Escherichia coli in children: in vitro and in silico analysis.
Microbial Pathogenesis 2021 January
The exchange of genes between bacterial chromosome and plasmid(s) and their integration into integrons are mainly responsible for acquisition and dissemination of antibiotic resistance. We investigated the role of integrons and their underlying molecular mechanisms leading to development of adaptability in E. coli and eventual resistance to antimicrobials. Escherichia coli isolates (n = 120); including 40 diarrheagenic isolates, an even number of isolates from cases other than diarrhea, and equal number of isolates from healthy children recovered from fresh stool samples were used for identification of integron genes and gene cassettes. The association of integrons with antibiotic resistance was assayed before phylogenetic analysis. DNA sequence analysis revealed class 1 and 2 integrons in 55.83% and 21.66% isolates, respectively. The integron presence was found significantly associated with the probability of antibiotic resistance in E. coli; the association being highest with class 1 integron. Modelling and molecular docking along with molecular dynamics simulation analyses found ceftriaxone and amoxicillin as potential inhibitors of dihydrofolate reductase (DHFR). The class 1 integrons of these pathogenic isolates can serve as prospective therapeutic targets using specific silencing strategies and combinational antimicrobial therapy. The findings may be useful for the development of a potent and versatile drug for DHFR inhibition.
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