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To understand differences in host-Candida albicans interactions that occur during colonization of healthy or compromised hosts, production of phenotypic variants and colonization of healthy or immunodeficient mice by C. albicans were studied. We showed that activity of the transcription factor Efg1p exhibited cell-to-cell variability and identified Efg1p as a major regulator of colonization. In C. albicans populations colonizing the murine gastrointestinal tract, average expression of EFG1 differed depending on the immune status of the host. We propose that cellular heterogeneity in Efg1p activity allows the C. albicans colonizing population to differ depending on the immune status of the host, because selective pressure from a healthy host alters the composition of the population. These data are the first demonstration that differences in host immune status are associated with differences in gene expression in colonizing C. albicans cells. Altered gene expression in organisms colonizing immunocompromised hosts may begin the transition of C. albicans from a commensal to a pathogen.

Variation in Candida albicans EFG1 Expression Enables Host-Dependent Changes in Colonizing Fungal Populations