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• W3166679830 abstract "Abstract Antimicrobial resistance in enteric or urinary Escherichia coli is a risk factor for invasive E. coli infections. Due to widespread trimethoprim resistance amongst urinary E. coli and increased bacteraemia incidence, a national recommendation to prescribe nitrofurantoin for uncomplicated urinary tract infection was made in 2018. Nitrofurantoin resistance is reported in <6% urinary E. coli isolates in the UK. However, mechanisms underpinning nitrofurantoin resistance in these isolates remain unknown. This study aimed to identify genetic determinants of nitrofurantoin resistance in a local E. coli collection and assess their prevalence in a larger dataset of E. coli genomes. Deleterious point mutations and gene-inactivating insertion sequences in both chromosomal nitroreductase genes nfsA and nfsB were identified in genomes of nine nitrofurantoin-resistant urinary E. coli isolates collected from north west London. Eight types of genetic alterations were identified when comparing sequences of nfsA , nfsB , and the associated gene ribE in 12,412 E. coli genomes collected from across the UK. Evolutionary analysis revealed homoplasic mutations and explained the order of stepwise mutations. An algorithm was developed to predict nitrofurantoin susceptibility and predictions for 20 accessible isolates were experimentally validated. Only one genome carrying oqxAB , a mobile gene complex associated with reduced nitrofurantoin susceptibility, was identified. In conclusion, mutations and insertion sequences in nfsA and nfsB are leading causes of nitrofurantoin resistance in UK E. coli . As nitrofurantoin exposure increases in human populations, the prevalence of nitrofurantoin resistance in carriage E. coli isolates and those from urinary and bloodstream infections should be monitored. Importance This study expands knowledge about the genetic basis of nitrofurantoin resistance in E. coli isolates using whole-genome sequencing and genomic analysis. We report novel and previously known deleterious mutations of chromosomal genes nfsA , nfsB , and ribE as well as the interruption of nfsA and nfsB by insertion sequences, recapitulating the roles of oxygen-insensitive nitroreductases in the development of nitrofurantoin resistance in E. coli . We revealed and categorised the genotypic diversity in these three genes in a large collection of UK E. coli genomes. A scoring algorithm is provided to predict nitrofurantoin susceptibility from genotypes. Our predictions suggest that acquired nitrofurantoin resistance is not of immediate concern in the UK. However, experimental validation of predictions suggested the involvement of mechanisms other than alterations in nfsA , nfsB , or ribE in determining nitrofurantoin susceptibility, emphasising the need for monitoring nitrofurantoin resistance amongst E. coli ." @default.
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• W3166679830 date "2021-05-28" @default.
• W3166679830 modified "2023-10-16" @default.
• W3166679830 title "Diverse Genetic Determinants of Nitrofurantoin Resistance in UK Escherichia coli" @default.
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• W3166679830 doi "https://doi.org/10.1101/2021.05.27.446087" @default.
• W3166679830 hasPublicationYear "2021" @default.
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