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doi: 10.1242/10.1242/dev.00281
1 Peking-Yale Joint Center of Plant Molecular Genetics and Agrobiotechnology,
College of Life Sciences, Peking University, Beijing 100871, Peoples Republic
of China
2 Department of Molecular, Cellular and Developmental Biology, Yale University,
New Haven, CT06520-8104, USA
3 Department of Epidemiology and Public Health, Yale University School of
Medicine, New Haven, Connecticut 06520, USA
* Author for correspondence at address2 (e-mail: xingwang.deng{at}yale.edu)
Accepted 29 October 2002
Microarray gene expression profiling was used to examine the role of pleiotropic COP/DET/FUS loci as well as other partially photomorphogenic loci during Arabidopsis seedling development and genome expression regulation. Four types of lethal, pleiotropic cop/det/fus mutants exhibit qualitatively similar gene expression profiles, yet each has specific differences. Mutations in COP1 and DET1 show the most similar genome expression profiles, while the mutations in the COP9 signalosome (CSN) and COP10 exhibit increasingly diverged genome expression profiles in both darkness and light. The genome expression profiles of the viable mutants of COP1 and DET1 in darkness mimic those of the physiological light-regulated genome expression profiles, whereas the genome expression profiles of representative lethal mutants belong to another clade and significantly diverge from the normal light control of genome expression. Instead, these lethal pleiotropic mutants show genome expression profiles similar to those from seedlings growth under high light intensity stress. Distinct lethal pleiotropic cop/det/fus mutants also result in distinct expression profiles in the small portion of genes examined and exhibit similar relatedness in both light and darkness. The partial cop/det/fus mutants affected expression of both light regulated and non-light regulated genes. Our results suggest that pleiotropic COP/DET/FUS loci control is largely overlapping but also has separable roles in plant development. The partially photomorphogenic loci regulate a subset of photomorphogenic responses as well as other non-light regulated processes.
Key words: Arabidopsis thaliana, COP/DET/FUS, Seeding development, Genome expression profile
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