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Originally published as Genetics Published Articles Ahead of Print on November 1, 2004.
Genetics, Vol. 169, 619-630, February 2005, Copyright © 2005
doi:10.1534/genetics.104.030767
The Zn(II)2Cys6 Putative Aspergillus nidulans Transcription Factor Repressor of Sexual Development Inhibits Sexual Development Under Low-Carbon Conditions and in Submersed Culture
Kay Vienken, Mario Scherer and Reinhard Fischer1
Department of Microbiology, University of Marburg and Max-Planck-Institute for Terrestrial Microbiology, D-35043 Marburg, Germany
1 Corresponding author: University of Karlsruhe, Institute of Applied Biosciences, Applied Microbiology, Hertzstrasse 16, D-76187 Karlsruhe, Germany.
E-mail: reinhard.fischer{at}bio.uni-karlsruhe.de
Here we have characterized the putative Zn(II)2Cys6 transcription factor RosA from the filamentous fungus Aspergillus nidulans. The rosA gene encodes a protein of 713 aa, which shares 38% sequence similarity to Pro1 from Sordaria macrospora. In contrast to Pro1, which promotes the transition from protoperithecia to perithecia, RosA is a negative regulator of sexual development in A. nidulans. Transcript levels of rosA were usually very low and were only transiently upregulated upon carbon starvation and at 12 hr of asexual development. Deletion of rosA only slightly induced fruiting-body formation under standard culture conditions, but enabled sexual development under low-glucose and high-osmolarity conditions and the production of Hülle cells under submersed growth conditions. Stimulation of fruiting-body formation on agar surfaces was dependent on veA. In 
rosA strains, transcript levels of the sexual developmental regulators nsdD, veA, and stuA were increased. Overexpression of rosA led to a reduction of hyphal growth and to a fluffy phenotype. Post-transcriptional regulation of RosA, with a regulated accumulation in the nucleus, was shown using a RosA-GFP fusion protein. We propose that RosA represses sexual development upon integration of several environmental signals.
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