J. Bacteriol., Jan 1996, 121-129, Vol 178, No. 1
Copyright © 1996, American Society for Microbiology

The sea pansy Renilla reniformis luciferase serves as a sensitive bioluminescent reporter for differential gene expression in Candida albicans

T Srikantha, A Klapach, WW Lorenz, LK Tsai, LA Laughlin, JA Gorman and DR Soll
Department of Biological Sciences, University of Iowa, Iowa City 52242, USA.

The infectious yeast Candida albicans progresses through two developmental programs which involve differential gene expression, the bud-hypha transition and high-frequency phenotypic switching. To understand how differentially expressed genes are regulated in this organism, the promoters of phase-specific genes must be functionally characterized, and a bioluminescent reporter system would facilitate such characterization. However, C. albicans has adopted a nontraditional codon strategy that involves a tRNA with a CAG anticodon to decode the codon CUG as serine rather than leucine. Since the luciferase gene of the sea pansy Renilla reinformis contains no CUGs, we have used it to develop a highly sensitive bioluminescent reporter system for C. albicans. When fused to the galactose-inducible promoter of GAL1, luciferase activity is inducible; when fused to the constitutive EF1 alpha 2 promoter, luciferase activity is constitutive; and when fused to the promoter of the white-phase-specific gene WH11 or the opaque-phase-specific gene OP4, luciferase activity is phase specific. The Renilla luciferase system can, therefore, be used as a bioluminescent reporter to analyze the strength and developmental regulation of C. albicans promoters.

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