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The emerging fungal pathogen Candida auris induces IFNγ to colonize mammalian hair follicles

Merrill, E. D.; Prudent, V.; Moghadam, P.; Rodriguez, A.; Hurabielle, C.; Wells, E.; Basso, P.; Scharschmidt, T. C.; Rosenblum, M.; Molofsky, A. B.; Noble, S. B.

2025-01-18 immunology
10.1101/2025.01.15.632653 bioRxiv
Show abstract

Public health alarm concerning the emerging fungus Candida auris is fueled by its antifungal drug resistance and propensity to cause deadly outbreaks. Persistent skin colonization drives transmission and lethal sepsis although its basis remains mysterious. We compared the skin colonization dynamics of C. auris with its relative C. albicans, quantifying skin fungal persistence and distribution and immune composition and positioning. C. auris displayed a higher propensity to colonize hair follicles and avidly bound to human hair. While C. albicans triggered an effective sterilizing type 3/17 antifungal immune response driven by IL-17A/F-producing lymphocytes, C. auris triggered a type 1, IFN{gamma}-driven immune response targeting hair follicles. Rather than promoting fungal clearance, IFN{gamma} enhanced C. auris skin colonization by acting directly on keratinocytes impairing epithelial barrier integrity and repressing antifungal defense programs. C. auris exploits focal skin immune responses to create a niche for persistence in hair follicles.

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