In vitro effect of qnrA1, qnrB1, and qnrS1 genes on fluoroquinolone activity against isogenic Escherichia coli isolates with mutations in gyrA and parC

Briales, Alejandra; Rodríguez Martínez, José Manuel; González Velasco, Carmen; Díaz de Alba, Paula; Domínguez Herrera, Juan M.; Pachón Díaz, Jerónimo; Pascual Hernández, Álvaro; Universidad de Sevilla. Departamento de Microbiología; Universidad de Sevilla. Departamento de Medicina

In vitro effect of qnrA1, qnrB1, and qnrS1 genes on fluoroquinolone activity against isogenic Escherichia coli isolates with mutations in gyrA and parC

2011

This article provides an analysis of the in vitro effect of qnrA1, qnrB1, and qnrS1 genes, combined with quinolone-resistant Ser83Leu substitutions in GyrA and/or Ser80Arg in ParC, on fluoroquinolone (FQ) resistance in isogenic Escherichia coli strains. The association of Ser83Leu substitution in GyrA, Ser80Arg substitution in ParC, and qnr gene expression increased the MIC of ciprofloxacin to 2 μg/ml. qnr genes present in E. coli that harbored a Ser83Leu substitution in GyrA increased mutant prevention concentration (MPC) values to 8 to 32 μg/ml. qnr gene expression in E. coli may play an important role in selecting for one-step FQ-resistant mutants.

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Ministerio de Sanidad y Consumo y Instituto de Salud Carlos III PI060580

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Consejería de Innovación Ciencia y Empresa Junta de Andalucía P07-CTS-02908

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Ministerio de Sanidad y Consumo y Instituto de Salud Carlos III-FEDER y Spanish Network for Research in Infectious Diseases REIPI RD06/0008

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