Genomic and phenotypic evolution of Escherichia coli in a novel citrate-only resource environment.

ABSTRACT: Evolutionary innovations allow populations to colonize new ecological niches. We previously reported that aerobic growth on citrate (Cit⁺) evolved in an Escherichia coli population during adaptation to a minimal glucose medium containing citrate (DM25). Cit⁺ variants can also grow in citrate-only medium (DM0), a novel environment for E. coli. To study adaptation to this niche, we founded two sets of Cit⁺ populations and evolved them for 2500 generations in DM0 or DM25. The evolved lineages acquired numerous parallel mutations, many mediated by transposable elements. Several also evolved amplifications of regions containing the maeA gene. Unexpectedly, some evolved populations and clones show apparent declines in fitness. We also found e

SUBMITTER: Blount ZD 

PROVIDER: S-EPMC7299349 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature