1887

Abstract

is an increasingly important cause of human disease; however, virulence determinants are largely uncharacterized. Previously, it was demonstrated that a rough, wild-type human clinical isolate (390R) causes persistent, invasive infection, while a smooth isogenic mutant (390S) has lost this capability. During serial passage of 390S, a spontaneous rough revertant was obtained, which was named 390V. This revertant regained the ability to cause persistent, invasive infection in human monocytes and the lungs of mice. Glycopeptidolipid (GPL), which plays a role in environmental colonization, was present in abundance in the cell wall of 390S, and was associated with sliding motility and biofilm formation. In contrast, a marked reduction in the amount of GPL in the cell wall of 390R and 390V was correlated with cord formation, a property associated with mycobacterial virulence. These results indicate that the ability to switch between smooth and rough morphologies may allow to transition between a colonizing phenotype and a more virulent, invasive form.

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2006-06-01
2024-03-28
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