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Corresponding author: Brian L. Wickes, Mail Code 7758, University of Texas Health Science Center, 7703 Floyd Curl Dr., San Antonio, TX 78229-3900., wickes{at}uthscsa.edu (E-mail)
Communicating editor: J. RINE
. The mating pathway of this fungus has a number of conserved genes, including a MAT-specific pheromone (MF1). A modified differential display strategy was used to identify a gene encoding the MATa pheromone. The gene, designated MFa1, is 42 amino acids in length and contains a conserved farnesylation motif. MFa1 is present in three linked copies that span a 20-kb fragment of MATa-specific DNA and maps to the MAT-containing chromosome. Transformation studies showed that MFa1 induced filament formation only in MAT cells, demonstrating that MFa1 is functionally conserved. Sequence analysis of the predicted Mfa1 and Mf1 proteins revealed that, in contrast to other fungi such as Saccharomyces cerevisiae, the C. neoformans pheromone genes are structurally and functionally conserved. However, unlike the MF1 gene, which is found in MAT strains of both varieties of C. neoformans, MFa1 is specific for the neoformans variety of C. neoformans.
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