Dissecting the genetic components of adaptation of Escherichia coli to the mouse gut

PLoS Genetics
A GiraudNadine Cerf-Bensussan

Abstract

While pleiotropic adaptive mutations are thought to be central for evolution, little is known on the downstream molecular effects allowing adaptation to complex ecologically relevant environments. Here we show that Escherichia coli MG1655 adapts rapidly to the intestine of germ-free mice by single point mutations in EnvZ/OmpR two-component signal transduction system, which controls more than 100 genes. The selective advantage conferred by the mutations that modulate EnvZ/OmpR activities was the result of their independent and additive effects on flagellin expression and permeability. These results obtained in vivo thus suggest that global regulators may have evolved to coordinate activities that need to be fine-tuned simultaneously during adaptation to complex environments and that mutations in such regulators permit adjustment of the boundaries of physiological adaptation when switching between two very distinct environments.

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Citations

Jul 16, 2014·Proceedings of the National Academy of Sciences of the United States of America·Hélène Licandro-SerautPhilippe J Sansonetti
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Methods Mentioned

BETA
NMR
ELISA
flow cytometry
PCR
IEC
electrophoretic
enzyme-linked immunosorbent assay
electrophoresis

Software Mentioned

Primer Express
Cell Quest

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