Simple and Rapid Detection of ESBL bla_SHV gene from an Urban River in Tokyo by Loop-Mediated Isothermal Amplification

Extended-spectrum β-lactamases (ESBLs) are produced mainly by gram-negative bacteria in Enterobacteriaceae. One of the major types of ESBLs is sulfhydryl variable (SHV) -type ESBL. Herein, we attempted to develop a simple and rapid method for the detection of the ESBL bla_SHV gene by loop-mediated isothermal amplification (LAMP) . The five-primer set designed could amplify bla_SHV gene at an isothermal temperature of 65℃. The detection limit of the LAMP method with the LF loop primer was 1 copy/tube, which was 10,000-fold more sensitive than that of the conventional PCR. The LAMP assay could also detect the direct amplification of bla_SHV gene from a single river water sample in Tokyo. The LAMP method has great potential for applications in hospital, soil and water environment, food, and livestock.