SE46:/S01
From Metabolonote
Sample Set Information
| ID | SE46 |
|---|---|
| Title | Unbiased characterization of genotype-dependent metabolic regulations by metabolomic approach in Arabidopsis thaliana |
| Description | Metabolites are not only the catalytic products of enzymatic reactions but also the active regulators or the ultimate phenotype of metabolic homeostasis in highly complex cellular processes. The modes of regulation at the metabolome level can be revealed by metabolic networks. We investigated the metabolic network between wild-type and 2 mutant (methionine-over accumulation 1 [mto1] and transparent testa4 [tt4]) plants regarding the alteration of metabolite accumulation in Arabidopsis thaliana. In the GC-TOF/MS analysis, we acquired quantitative information regarding over 170 metabolites, which has been analyzed by a novel score (ZMC, z-score of metabolite correlation) describing a characteristic metabolite in terms of correlation. Although the 2 mutants revealed no apparent morphological abnormalities, the overall correlation values in mto1 were much lower than those of the wild-type and tt4 plants, indicating the loss of overall network stability due to the uncontrolled accumulation of methionine. In the tt4 mutant, a new correlation between malate and sinapate was observed although the levels of malate, sinapate, and sinapoylmalate remain unchanged, suggesting an adaptive reconfiguration of the network. Gene-expression correlations presumably responsible for these metabolic networks were determined using the metabolite correlations as clues. Two Arabidopsis mutants, mto1 and tt4, exhibited the following changes in entire metabolome networks: the overall loss of metabolic stability (mto1) or the generation of a metabolic network of a backup pathway for the lost physiological functions (tt4). The expansion of metabolite correlation to gene-expression correlation provides detailed insights into the systemic understanding of the plant cellular process regarding metabolome and transcriptome. |
| Authors | Miyako Kusano, Atsushi Fukushima, Masanori Arita, Par Jonsson, Thomas Moritz, Makoto Kobayashi, Naomi Hayashi, Takayuki Tohge, Kazuki Saito, RIKEN PSC |
| Reference | Kusano, Fukushima et al. (2007) BMC Syst Biol 1:53 (PMID: 18028551) |
| Comment |
Related data are deposited in MetaboLights.
Sample Information
| ID | S01 |
|---|---|
| Title | Arabidopsis thaliana |
| Organism - Scientific Name | Arabidopsis thaliana |
| Organism - ID | NCBI taxonomy:3702 |
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| Preparation | Wild-type A.thaliana plants accession Columbia (Col-0) and the mutants mto1 (Inaba et al. 1994) and tt4 (Shikazono et al. 2003) of Col-0 background were obtained from Dr. Naito, Hokkaido University, and Dr. Kitamura, Japan Atomic Energy Research Institute, respectively. The sterilized seeds were stratified at 5°C for 2 d, and were successively sown on Murashige and Skoog (MS) medium containing 1% sucrose. Plants were cultivated in controlled growth chambers at 22°C in 16-h light and 8-h dark conditions for 18 d. The aerial regions were harvested with 20 different biological replicates, 6 h after the onset of the bright phase. |
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