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BMC Evolutionary Biology

, 16:86

Experimental evolution

Abstract

BackgroundThe impact of historical contingency, i.e. the past evolutionary history of a population, on further adaptation is mostly unknown at both the phenotypic and genomic levels. We addressed this question using a two-step evolution experiment. First, replicate populations of Escherichia coli were propagated in four different environmental conditions for 1000 generations. Then, all replicate populations were transferred and propagated for further 1000 generations to a single new environment.

ResultsUsing this two-step experimental evolution strategy, we investigated, at both the phenotypic and genomic levels, whether and how adaptation in the initial historical environments impacted evolutionary trajectories in a new environment. We showed that both the growth rate and fitness of the evolved populations obtained after the second step of evolution were contingent upon past evolutionary history. In contrast however, the genes that were modified during the second step of evolution were independent from the previous history of the populations.

ConclusionsOur work suggests that historical contingency affects phenotypic adaptation to a new environment. This was however not reflected at the genomic level implying complex relationships between environmental factors and the genotype-to-phenotype map.

KeywordsExperimental evolution Escherichia coli Adaptation Historical contingency Epistasis AbbreviationsAceacetate

DAPDdifference of the absolute phenotypic difference between the populations

DMDavis minimal medium

GlcD-gluconate

GluD-glucose

Glyglycerol

OD600optical density at 600 nm

TAtetrazolium arabinose

Electronic supplementary materialThe online version of this article doi:10.1186-s12862-016-0662-8 contains supplementary material, which is available to authorized users.

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Autor: Jessica Plucain - Antonia Suau - Stéphane Cruveiller - Claudine Médigue - Dominique Schneider - Mickaël Le Gac

Fuente: https://link.springer.com/







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