Journal
DIABETES
Volume 64, Issue 8, Pages 2991-2995Publisher
AMER DIABETES ASSOC
DOI: 10.2337/db15-0031
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Funding
- INSERM [INSERM U1047]
- University of Montpellier
- French Society of Diabetes (ALFEDIAM grant)
- Languedoc-Roussillon Region (Chercheur d'Avenir award)
- Infectiopole Sud Foundation
- British Infection Association research fellowship
- National Institutes of Health (NIH) [R01-AI-069233]
- MRC [G0701932, G108/595, MR/M004864/1] Funding Source: UKRI
- Medical Research Council [MR/M004864/1, G108/595, G0701932] Funding Source: researchfish
- NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES [R01AI069233] Funding Source: NIH RePORTER
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Staphylococcus aureus is an opportunistic bacterium capable of causing a wide range of severe diseases when it gains access to underlying tissues. Paradoxically, S. aureus is a common inhabitant of the skin microflora and colonizes the nares and other human mucosa. The purpose of this study was to determine the genetic basis for the differences in the pathogenic versus colonizing potential of S. aureus isolated from diabetic foot ulcers (DFUs). By performing optical map comparisons of a collection of S. aureus strains isolated from DFUs, we brought to light a prophage present in noninfecting bacteria. The phage, namely ROSA-like, was localized in a hotspot region Phi NM2 near the locus isd, the iron surface determinant system. The integrated phage significantly reduces the virulence of the strain and increases the biofilm formation. DFUs seem to be a specific niche of this colonizing strain. The ROSA-like phage represents the first description of a mobile element present mainly in S. aureus isolated from DFUs, which modulates the relationship of the bacteria with its human host. This phage appears to attenuate bacterial virulence and promote colonization.
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