Evolution experiments in the laboratory have focused heavily on model organisms, often to the exclusion of clinically relevant pathogens. The foodborne bacterial pathogen belongs to a genus whose genomes are small compared to those of its closest genomic relative, the free-living genus , suggesting genome reduction during the course of evolution to host association. In an experiment, serially passaged in rich medium in the laboratory exhibited loss of flagellar motility-an essential function for host colonization.
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