Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of barley response to Yariv-reagent effect on aleurone GA signaling

ABSTRACT: Microarray analysis was performed to know how many gibberellin (GA)-responsive genes are inhibited by beta-Yariv reagent, a specific binder of plant arabinogalactan-proteins. cRNAs were prepared from mRNAs isolated from aleurone protoplasts that were treated with GA, GA plus beta-Yariv reagent, or mock (DMSO)-treated for 24 hours, and were subjected to microarray analysis. The analysis was performed twice using target cRNAs prepared independently. Experiment Overall Design: 2 control (DMSO), 2 gibberellin and 2 gibberellin plus beta-Yariv reagent-treated biological replicates were analyzed at 24 h.

ORGANISM(S): Hordeum vulgare

SUBMITTER: kiyoshi mashiguchi

PROVIDER: E-GEOD-8712 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:This model is from the article: Mathematical modeling elucidates the role of transcriptional feedback in gibberellin signaling. Middleton AM , Úbeda-Tomás S , Griffiths J , Holman T , Hedden P , Thomas SG , Phillips AL , Holdsworth MJ , Bennett MJ , King JR, Owen MR Proc. Natl. Acad. Sci. U.S.A. 2012 May; 109(19): 7571-6 22523240 , Abstract: The hormone gibberellin (GA) is a key regulator of plant growth. Many of the components of the gibberellin signal transduction [e.g., GIBBERELLIN INSENSITIVE DWARF 1 (GID1) and DELLA], biosynthesis [e.g., GA 20-oxidase (GA20ox) and GA3ox], and deactivation pathways have been identified. Gibberellin binds its receptor, GID1, to form a complex that mediates the degradation of DELLA proteins. In this way, gibberellin relieves DELLA-dependent growth repression. However, gibberellin regulates expression of GID1, GA20ox, and GA3ox, and there is also evidence that it regulates DELLA expression. In this paper, we use integrated mathematical modeling and experiments to understand how these feedback loops interact to control gibberellin signaling. Model simulations are in good agreement with in vitro data on the signal transduction and biosynthesis pathways and in vivo data on the expression levels of gibberellin-responsive genes. We find that GA-GID1 interactions are characterized by two timescales (because of a lid on GID1 that can open and close slowly relative to GA-GID1 binding and dissociation). Furthermore, the model accurately predicts the response to exogenous gibberellin after a number of chemical and genetic perturbations. Finally, we investigate the role of the various feedback loops in gibberellin signaling. We find that regulation of GA20ox transcription plays a significant role in both modulating the level of endogenous gibberellin and generating overshoots after the removal of exogenous gibberellin. Moreover, although the contribution of other individual feedback loops seems relatively small, GID1 and DELLA transcriptional regulation acts synergistically with GA20ox feedback.

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Transcription profiling of barley response to Yariv-reagent effect on aleurone GA signaling

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