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Genetics, Vol. 161, 509-519, June 2002, Copyright © 2002

Spt3 Plays Opposite Roles in Filamentous Growth in Saccharomyces cerevisiae and Candida albicans and Is Required for C. albicans Virulence

Lisa Lapradea, Victor L. Boyartchuka, William F. Dietricha,b, and Fred Winstona
a Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115
b Howard Hughes Medical Institute, Harvard Medical School, Boston, Massachusetts 02115

Corresponding author: Fred Winston, Harvard Medical School, 200 Longwood Ave., Boston, MA 02115., winston{at}rascal.med.harvard.edu (E-mail)

Communicating editor: A. P. MITCHELL

Spt3 of Saccharomyces cerevisiae is required for the normal transcription of many genes in vivo. Past studies have shown that Spt3 is required for both mating and sporulation, two events that initiate when cells are at G1/START. We now show that Spt3 is needed for two other events that begin at G1/START, diploid filamentous growth and haploid invasive growth. In addition, Spt3 is required for normal expression of FLO11, a gene required for filamentous growth, although this defect is not the sole cause of the spt3{Delta}/spt3{Delta} filamentous growth defect. To extend our studies of Spt3's role in filamentous growth to the pathogenic yeast Candida albicans, we have identified the C. albicans SPT3 gene and have studied its role in C. albicans filamentous growth and virulence. Surprisingly, C. albicans spt3{Delta}/spt3{Delta} mutants are hyperfilamentous, the opposite phenotype observed for S. cerevisiae spt3{Delta}/spt3{Delta} mutants. Furthermore, C. albicans spt3{Delta}/spt3{Delta} mutants are avirulent in mice. These experiments demonstrate that Spt3 plays important but opposite roles in filamentous growth in S. cerevisiae and C. albicans.




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