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Originally published as Genetics Published Articles Ahead of Print on June 14, 2005.
Genetics, Vol. 171, 101-108, September 2005, Copyright © 2005
doi:10.1534/genetics.104.040048
The dst1 Gene Involved in Mushroom Photomorphogenesis of Coprinus cinereus Encodes a Putative Photoreceptor for Blue Light
Kazuhisa Terashima*,
,
Katsuyuki Yuki*,
Hajime Muraguchi*,1,
Masashi Akiyama* and
Takashi Kamada*,2
* Department of Molecular Biology, Division of Bioscience, Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan and Research Fellow of the Japanese Society for the Promotion of Science, Tokyo 102-8471, Japan
2 Corresponding author: Department of Biology, Faculty of Science, Okayama University, Okayama 700-8530, Japan.
E-mail: kamada{at}cc.okayama-u.ac.jp
The homobasidiomycete Coprinus cinereus exhibits remarkable photomorphogenesis during fruiting-body development. Under proper light conditions, fruiting-body primordia proceed to the maturation phase in which basidia in the pileus undergo meiosis, producing sexual spores, followed by stipe elongation and pileus expansion for efficient dispersal of the spores. In the continuous darkness, however, the primordia do not proceed to the maturation phase but are etiolated: the pileus and stipe tissues at the upper part of the primordium remain rudimentary and the basal part of the primordium elongates, producing "dark stipe." In this study we genetically analyzed five strains that produce dark stipes even if light conditions promoting the maturation are given and then characterized one of them, Uar801 (dst1-1). The dst1 gene was cloned as a DNA fragment that rescues the dst1-1 mutation. Dst1 is predicted to be a protein of 1175 amino acids that contains two PAS domains, a coiled-coil structure, and a putative, glutamine-rich, transcriptional activation domain (AD). One of the PAS domains exhibits significant similarity to the LOV domains of known blue-light receptors, suggesting that Dst1 is a blue-light receptor of C. cinereus. The dst1-1 mutation is predicted to truncate the putative AD in the C-terminal region.
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