The influence of qnrA1 on the development of quinolone resistance in Enterobacteriaceae was evaluated by using the mutant prevention concentration parameter. The expression of qnrA1 considerably increased the mutant prevention concentration compared to strains without this gene. In the presence of qnrA1, mutations in gyrA and parC genes were easily selected to produce high levels of quinolone resistance.
This study was supported by the Dirección General de Investigación del Ministerio de Ciencia y Tecnología of Spain (project SAF2005-04704), the Ministerio de Sanidad y Consumo, Instituto de Salud Carlos III (project PI060580), and the Spanish Network for the Research in Infectious Diseases (REIPI RD06/0008) of Spain. This study
was partially supported by a grant from Bayer.
Identificador
Rodríguez-Martínez JM, Velasco C, García I,Cano ME, Martínez-Martínez L, Pascual A.Mutant prevention concentrations of fluoroquinolones for Enterobacteriaceae expressing the plasmid-carried quinolone resistance determinant qnrA1.Antimicrob Agents Chemother. 2007 Jun;51(6):2236-9.