1887

Abstract

Colistin is an important cationic antimicrobial peptide (CAMP) in the fight against infection in cystic fibrosis (CF) lungs. The effects of subinhibitory concentrations of colistin on gene expression in were investigated by transcriptome and functional genomic approaches. Analysis revealed altered expression of 30 genes representing a variety of pathways associated with virulence and bacterial colonization in chronic infection. These included response to osmotic stress, motility, and biofilm formation, as well as genes associated with LPS modification and quorum sensing (QS). Most striking was the upregulation of Pseudomonas quinolone signal (PQS) biosynthesis genes, including , and , and the phenazine biosynthesis operon. Induction of this central component of the QS network following exposure to subinhibitory concentrations of colistin may represent a switch to a more robust population, with increased fitness in the competitive environment of the CF lung.

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2009-09-01
2019-10-20
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Primers used in this study [PDF file](52 KB)

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Genes showing significantly altered expression in the colistin-treated sample [PDF file](94 KB)

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Motility analysis in the presence of colistin [PDF file](36 KB)

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