期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 106, 期 10, 页码 3982-3987出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0811669106
关键词
bacterial pathogenesis; cis-regulatory mutation; evo-devo; pathoadaptation; regulatory evolution
资金
- Canadian Institutes of Health Research [MOP-82704]
- Public Health Agency of Canada
- National Institutes of Health [GM-58746]
- National Science Foundation [MCB-0613014]
- Canadian Institutes of Health Research
- American Society of Microbiology
- Ontario Ministry of Research and Innovation
- Ontario Graduate Scholarship.
The acquisition of DNA by horizontal gene transfer enables bacteria to adapt to previously unexploited ecological niches. Although horizontal gene transfer and mutation of protein-coding sequences are well-recognized forms of pathogen evolution, the evolutionary significance of cis-regulatory mutations in creating phenotypic diversity through altered transcriptional outputs is not known. We show the significance of regulatory mutation for pathogen evolution by mapping and then rewiring a cis-regulatory module controlling a gene required for murine typhoid. Acquisition of a binding site for the Salmonella pathogenicity island-2 regulator, SsrB, enabled the srfN gene, ancestral to the Salmonella genus, to play a role in pathoadaptation of S. typhimurium to a host animal. We identified the evolved cis-regulatory module and quantified the fitness gain that this regulatory output accrues for the bacterium using competitive infections of host animals. Our findings highlight a mechanism of pathogen evolution involving regulatory mutation that is selected because of the fitness advantage the new regulatory output provides the incipient clones.
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