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Genetics, Vol 147, 1643-1652, Copyright © 1997
INVESTIGATIONS |
A MADS-Box Homologue in Ustilago maydis Regulates the Expression of Pheromone-Inducible Genes but Is Nonessential
J. Kruger, C. Aichinger, R. Kahmann and M. Bolker
Institut fur Genetik und Mikrobiologie der Universitat Munchen, D-80638 Munchen, Germany
Mating and pathogenic development in the smut fungus Ustilago maydis are controlled by a pheromone/receptor system and two homeodomain proteins, bEp and bWp, which form heterodimers in nonallelic combinations. We describe the isolation of a gene, umc1, encoding a MADS-box protein, which displays significant similarity to the Saccharomyces cerevisiae MCM1 gene. umc1 complemented the viability defect of yeast mcm1 mutants. In U. maydis, umc1 deletion mutants were viable and pathogenic development was unaffected. Nevertheless, the basal expression levels of several pheromone-inducible genes were significantly reduced leading to an attenuated mating reaction. In contrast to S. cerevisiae, where Mcm1p plays a crucial role in the cell-type specific expression of a- and {alpha}-specific genes, the U. maydis umc1 gene appears to have only a modulatory effect on the expression of mating type-specific genes.
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