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Rapid evolution of generalised resistance mechanisms can constrain the efficacy of phage-antibiotic treatments

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Rapid evolution of generalised resistance mechanisms can constrain the efficacy of phage-antibiotic treatments. / Moulton-Brown, Claire E.; Friman, Ville-Petri.

In: Evolutionary applications, 01.10.2018.

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Harvard

Moulton-Brown, CE & Friman, V-P 2018, 'Rapid evolution of generalised resistance mechanisms can constrain the efficacy of phage-antibiotic treatments', Evolutionary applications. https://doi.org/10.1111/eva.12653

APA

Moulton-Brown, C. E., & Friman, V-P. (2018). Rapid evolution of generalised resistance mechanisms can constrain the efficacy of phage-antibiotic treatments. Evolutionary applications. https://doi.org/10.1111/eva.12653

Vancouver

Moulton-Brown CE, Friman V-P. Rapid evolution of generalised resistance mechanisms can constrain the efficacy of phage-antibiotic treatments. Evolutionary applications. 2018 Oct 1. https://doi.org/10.1111/eva.12653

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Moulton-Brown, Claire E. ; Friman, Ville-Petri. / Rapid evolution of generalised resistance mechanisms can constrain the efficacy of phage-antibiotic treatments. In: Evolutionary applications. 2018.

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@article{72417c17575846ccbcf17516f3f1730d,
title = "Rapid evolution of generalised resistance mechanisms can constrain the efficacy of phage-antibiotic treatments",
abstract = "Antimicrobial resistance has been estimated to be responsible for over 700,000 deaths per year, therefore new antimicrobial therapies are urgently needed. One way to increase the efficiency of antibiotics is to use them in combination with bacteria-specific parasitic viruses, phages, which have been shown to exert additive or synergistic effects in controlling bacteria. However, it is still unclear to what extent these combinatory effects are limited by rapid evolution of resistance, especially when the pathogen grows as biofilm on surfaces typical for many persistent and chronic infections. To study this, we used a microcosm system, where genetically isogenic populations of Pseudomonas aeruginosa PAO1 bacterial pathogen were exposed to a phage 14/1, gentamycin or a combination of them both in a spatially structured environment. We found that even though antibiotic and phage-antibiotic treatments were equally effective at controlling bacteria in the beginning of the experiment, combination treatment rapidly lost its efficacy in both planktonic and biofilm populations. Mechanistically, this was due to rapid resistance evolution: while both antibiotic and phage selected for increased resistance on their own, phage selection correlated positively with increase in antibiotic resistance, while biofilm growth, which provided generalised resistance mechanism, was favoured most in in the combination treatment. Only relatively small cost of resistance and weak evidence for coevolutionary dynamics were observed. Together these results suggest that spatial heterogeneity can promote rapid evolution of generalised resistance mechanisms without corresponding increase in phage infectivity, which could potentially limit the effectiveness of phage-antibiotic treatments in the evolutionary timescale.",
author = "Moulton-Brown, {Claire E.} and Ville-Petri Friman",
note = "{\textcopyright} 2018 The Authors. Evolutionary Applications published by John Wiley & Sons Ltd ",
year = "2018",
month = oct,
day = "1",
doi = "10.1111/eva.12653",
language = "English",
journal = "Evolutionary applications",
issn = "1752-4571",
publisher = "Wiley-Blackwell",

}

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TY - JOUR

T1 - Rapid evolution of generalised resistance mechanisms can constrain the efficacy of phage-antibiotic treatments

AU - Moulton-Brown, Claire E.

AU - Friman, Ville-Petri

N1 - © 2018 The Authors. Evolutionary Applications published by John Wiley & Sons Ltd

PY - 2018/10/1

Y1 - 2018/10/1

N2 - Antimicrobial resistance has been estimated to be responsible for over 700,000 deaths per year, therefore new antimicrobial therapies are urgently needed. One way to increase the efficiency of antibiotics is to use them in combination with bacteria-specific parasitic viruses, phages, which have been shown to exert additive or synergistic effects in controlling bacteria. However, it is still unclear to what extent these combinatory effects are limited by rapid evolution of resistance, especially when the pathogen grows as biofilm on surfaces typical for many persistent and chronic infections. To study this, we used a microcosm system, where genetically isogenic populations of Pseudomonas aeruginosa PAO1 bacterial pathogen were exposed to a phage 14/1, gentamycin or a combination of them both in a spatially structured environment. We found that even though antibiotic and phage-antibiotic treatments were equally effective at controlling bacteria in the beginning of the experiment, combination treatment rapidly lost its efficacy in both planktonic and biofilm populations. Mechanistically, this was due to rapid resistance evolution: while both antibiotic and phage selected for increased resistance on their own, phage selection correlated positively with increase in antibiotic resistance, while biofilm growth, which provided generalised resistance mechanism, was favoured most in in the combination treatment. Only relatively small cost of resistance and weak evidence for coevolutionary dynamics were observed. Together these results suggest that spatial heterogeneity can promote rapid evolution of generalised resistance mechanisms without corresponding increase in phage infectivity, which could potentially limit the effectiveness of phage-antibiotic treatments in the evolutionary timescale.

AB - Antimicrobial resistance has been estimated to be responsible for over 700,000 deaths per year, therefore new antimicrobial therapies are urgently needed. One way to increase the efficiency of antibiotics is to use them in combination with bacteria-specific parasitic viruses, phages, which have been shown to exert additive or synergistic effects in controlling bacteria. However, it is still unclear to what extent these combinatory effects are limited by rapid evolution of resistance, especially when the pathogen grows as biofilm on surfaces typical for many persistent and chronic infections. To study this, we used a microcosm system, where genetically isogenic populations of Pseudomonas aeruginosa PAO1 bacterial pathogen were exposed to a phage 14/1, gentamycin or a combination of them both in a spatially structured environment. We found that even though antibiotic and phage-antibiotic treatments were equally effective at controlling bacteria in the beginning of the experiment, combination treatment rapidly lost its efficacy in both planktonic and biofilm populations. Mechanistically, this was due to rapid resistance evolution: while both antibiotic and phage selected for increased resistance on their own, phage selection correlated positively with increase in antibiotic resistance, while biofilm growth, which provided generalised resistance mechanism, was favoured most in in the combination treatment. Only relatively small cost of resistance and weak evidence for coevolutionary dynamics were observed. Together these results suggest that spatial heterogeneity can promote rapid evolution of generalised resistance mechanisms without corresponding increase in phage infectivity, which could potentially limit the effectiveness of phage-antibiotic treatments in the evolutionary timescale.

U2 - 10.1111/eva.12653

DO - 10.1111/eva.12653

M3 - Article

JO - Evolutionary applications

JF - Evolutionary applications

SN - 1752-4571

ER -