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Spatiotemporal microbial evolution on antibiotic landscapes.

ABSTRACT: A key aspect of bacterial survival is the ability to evolve while migrating across spatially varying environmental challenges. Laboratory experiments, however, often study evolution in well-mixed systems. Here, we introduce an experimental device, the microbial evolution and growth arena (MEGA)-plate, in which bacteria spread and evolved on a large antibiotic landscape (120 × 60 centimeters) that allowed visual observation of mutation and selection in a migrating bacterial front. While resistance increased consistently, multiple coexisting lineages diversified both phenotypically and genotypically. Analyzing mutants at and behind the propagating front, we found that evolution is not always led by the most resistant mutants; highly resistant mutants may be trapped behind more sensitive lineages. The MEGA-plate provides a versatile platform for studying microbial adaption and directly visualizing evolutionary dynamics.

SUBMITTER: Baym M

PROVIDER: S-EPMC5534434 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature

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Spatiotemporal microbial evolution on antibiotic landscapes.

Baym Michael M Lieberman Tami D TD Kelsic Eric D ED Chait Remy R Gross Rotem R Yelin Idan I Kishony Roy R

Science (New York, N.Y.) 20160901 6304

A key aspect of bacterial survival is the ability to evolve while migrating across spatially varying environmental challenges. Laboratory experiments, however, often study evolution in well-mixed systems. Here, we introduce an experimental device, the microbial evolution and growth arena (MEGA)-plate, in which bacteria spread and evolved on a large antibiotic landscape (120 × 60 centimeters) that allowed visual observation of mutation and selection in a migrating bacterial front. While resistanc ...[more]

PMID: 27609891

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