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The yeast-to-hypha morphological transition (dimorphism) is typical of many pathogenic fungi. Dimorphism has been attributed to changes in temperature and nutritional status and is believed to constitute a mechanism of response to adverse conditions. We have isolated and characterized a gene,MHY1 , whose transcription is dramatically increased during the yeast-to-hypha transition inYarrowia lipolytica . Deletion ofMHY1 is viable and has no effect on mating, but it does result in a complete inability of cells to undergo mycelial growth.MHY1 encodes a C2 H2 -type zinc finger protein, Mhy1p, which can bind putativecis -acting DNA stress response elements, suggesting that Mhy1p may act as a transcription factor. Interestingly, Mhy1p tagged with a hemagglutinin epitope was concentrated in the nuclei of actively growing cells found at the hyphal tip.

journal of bacteriology

MHY1 Encodes a C 2 H 2 -Type Zinc Finger Protein That Promotes Dimorphic Transition in the Yeast Yarrowia lipolytica