Characterization of genes regulating dimorphic transition between yeast and pseudohyphal form.

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Ethanol caused mycelial growth in the imperfect yeast Candida tropicalis Pk233. Cultivation with ethanol gave biphasic growth curves. During the first growth phase in the ethanol culture, there was an accumulation of swollen spherical yeast cells and after entering the second phase, pseudohyphal cells appeared, projecting from the swollen yeast cells. Subtractive cloning of genes was performed on the cDNAs of the ethanol culture, from which the cDNAs of the control cultur had been subtracted by hybridization. Isolated included Ctnmt1^+ homologous to S.pombe nmt1^+ oncoding the enzyme for thiamine biosynthesis and CtPP1 homologous to C.albicans CPP1 encoding tyrosine phosphatase.. Correlation was suggested of the process of ethanol-induced pseudomycelial formation with thiamine metabolism, since the elongation of the pseudohyphal growth was suppressed when exogenous thiamine was supplemented at the late stage of the first growth phase. Disruption of CtPP1 brought about the phenotype defective in pseudomycelial formation, suggesting the participation of MAP kinase cascade in the formation.