Molecular Biology and Evolution, Vol 15, 789-797, Copyright © 1998 by Society for Molecular Biology and Evolution
DS Treves, S Manning and J Adams
Six out of 12 independent replicate populations of Escherichia coli
maintained in long-term glucose-limited continuous culture for up to
approximately 1,750 generations evolve polymorphisms maintained by acetate
crossfeeding. In all cases, the acetate-crossfeeding phenotype is
associated with semiconstitutive overexpression of acetyl CoA synthetase,
which allows for the enhanced uptake of low levels of exogenous acetate.
Mutations in the 5' regulatory region of the acetyl CoA synthetase locus
are responsible for all the acetate crossfeeding phenotypes found. These
changes were either transposable-element insertions or a single T-->A
nucleotide substitution at position -93 relative to the acs gene
translation start site.
ORIGINAL ARTICLE
Repeated evolution of an acetate-crossfeeding polymorphism in long-term populations of Escherichia coli
Department of Biology, University of Michigan 48109-1048, USA. julian@umich.edu
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