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The increasing emergence of multidrug- and pan-resistant pathogens requires rapid and cost-efficient diagnostic tools to contain their further spread in healthcare facilities and the environment. The currently established diagnostic technologies are of limited utility for efficient infection control measures because they are either cultivation-based and time-consuming or require sophisticated assays that are expensive. Furthermore, infectious diseases are unfortunately most problematic in countries with low-resource settings in their healthcare systems. In this study, we developed a cost-efficient detection technology that uses G-quadruplex DNAzymes to convert a chromogenic substrate resulting in a color change in the presence of antibiotic resistance genes. The assay is based on padlock probes capable of high-multiplex reactions and targets 27 clinically relevant antibiotic resistance genes associated with sepsis. In addition to an experimental proof-of-principle using synthetic target DNA, the assay was evaluated with multidrug-resistant clinical isolates.

Padlock Probe-Based Generation of DNAzymes for the Colorimetric Detection of Antibiotic Resistance Genes