title: Distinctive features of plant organs characterized by global analysis of gene expression in Arabidopsis.
abstract: The distinctive features of plant organs are primarily determined by organ-specific gene expression. We analyzed the expression specificity of 8809 genes in 7 organs of Arabidopsis using a cDNA macroarray system. Using relative expression (RE) values between organs, many known and unknown genes specifically expressed in each organ were identified. We also analyzed the organ specificity of various gene groups using the GRE (group relative expression) value, the average of the REs of all genes in a group. Consequently, we found that many gene groups even ribosomal protein genes, have strong organ-specific expression. Clustering of the expression profiles revealed that the 8809 genes were classified into 9 major categories. Although 3451 genes were clustered into the largest category, which showed constitutive gene expression, 266 and 1005 genes were found to be root- and silique-specific genes, respectively. By this clustering, particular gene groups which showed multi-organ-specific expression profiles, such as bud-flower-specific, stem-silique-specific or bud-flower-root-specific profiles, could be effectively identified. From these results, major features of plant organs could be characterized by their distinct profiles of global gene expression. These data of organ-specific gene expression are available at our web site: Arabidopsis thaliana Tissue-Specific Expression Database, ATTED (http://www.atted.bio.titech.ac.jp/).
authors.affiliation: Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Yokohama, Kanagawa 226-8501, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Obayashi
authors.forename: Takashi
authors.initials: T
authors.lastname: Okegawa
authors.forename: Yuko
authors.initials: Y
authors.lastname: Sasaki-Sekimoto
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Shimada
authors.forename: Tatsuru
authors.initials: T
authors.lastname: Masuda
authors.forename: Erika
authors.initials: E
authors.lastname: Asamizu
authors.forename: Yasukazu
authors.initials: Y
authors.lastname: Nakamura
authors.forename: Daisuke
authors.initials: D
authors.lastname: Shibata
authors.forename: Satoshi
authors.initials: S
authors.lastname: Tabata
authors.forename: Ken-ichiro
authors.initials: K
authors.lastname: Takamiya
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Ohta
mesh_terms: D017360:Arabidopsis / Q000235:genetics*; D020224:Expressed Sequence Tags; D020869:Gene Expression Profiling; D017343:Genes, Plant; D018745:Genome, Plant; D010802:Phylogeny; D018517:Plant Roots / Q000235:genetics