Spatiotemporal microbial evolution on antibiotic landscapes.
Spatiotemporal microbial evolution on antibiotic landscapes.
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DOI:
10.1126/science.aag0822
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发表时间:
2016-09-09
期刊:
影响因子:
--
通讯作者:
Kishony R
中科院分区:
文献类型:
--
作者:
Baym M;Lieberman TD;Kelsic ED;Chait R;Gross R;Yelin I;Kishony R
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 evolve on a large antibiotic landscape (120x60cm), allowing visual observation of mutation and selection in a migrating bacterial front. While resistance increases consistently, multiple coexisting lineages diversify both phenotypically and genotypically. Analyzing mutants at and behind the propagating front, we find 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 a direct seeing-is-believing visualization of evolutionary dynamics.
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