Drug-Driven Phenotypic Convergence Supports Rational Treatment Strategies of Chronic Infections

Lejla Imamovic, Mostafa Mostafa Hashim Ellabaan, Ana Manuel Dantas Machado, Linda Citterio, Tune Wulff, Søren Molin, Helle Krogh Johansen, Morten Otto Alexander Sommer*

*Corresponding author for this work

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Chronic Pseudomonas aeruginosa infections evade antibiotic therapy and are associated with mortality in cystic fibrosis (CF) patients. We find that in vitro resistance evolution of P. aeruginosa toward clinically relevant antibiotics leads to phenotypic convergence toward distinct states. These states are associated with collateral sensitivity toward several antibiotic classes and encoded by mutations in antibiotic resistance genes, including transcriptional regulator nfxB. Longitudinal analysis of isolates from CF patients reveals similar and defined phenotypic states, which are associated with extinction of specific sub-lineages in patients. In-depth investigation of chronic P. aeruginosa populations in a CF patient during antibiotic therapy revealed dramatic genotypic and phenotypic convergence. Notably, fluoroquinolone-resistant subpopulations harboring nfxB mutations were eradicated by antibiotic therapy as predicted by our in vitro data. This study supports the hypothesis that antibiotic treatment of chronic infections can be optimized by targeting phenotypic states associated with specific mutations to improve treatment success in chronic infections.
Original languageEnglish
Issue number1-2
Pages (from-to)121-134
Publication statusPublished - 2018

Bibliographical note

Open Access funded by European Research Council
Under a Creative Commons license

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