4.8 Article

Antithetic population response to antibiotics in a polybacterial community

Journal

SCIENCE ADVANCES
Volume 6, Issue 10, Pages -

Publisher

AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aaz5108

Keywords

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Funding

  1. Spanish Ministry of Economy and Competitiveness
  2. FEDER [PGC2018-101251-B-I00]
  3. Generalitat de Catalunya [2017SGR1054]
  4. ICREA Academia programme
  5. Maria de Maeztu Programme for Units of Excellence in R&D (Spanish Ministry of Economy and Competitiveness) [MDM-2014-0370]

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Much is known about the effects of antibiotics on isolated bacterial species, but their influence on polybacterial communities is less understood. Here, we study the joint response of a mixed community of nonresistant Bacillus subtilis and Escherichia coli bacteria to moderate concentrations of the beta-lactam antibiotic ampicillin. We show that when the two organisms coexist, their population response to the antibiotic is opposite to that in isolation: Whereas in monoculture B. subtilis is tolerant and E. coli is sensitive to ampicillin, in coculture it is E. coli who can proliferate in the presence of the antibiotic, while B. subtilis cannot. This antithetic behavior is predicted by a mathematical model constrained only by the responses of the two species in isolation. Our results thus show that the collective response of mixed bacterial ecosystems to antibiotics can run counter to what single-species potency studies tell us about their efficacy.

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