Establishment of Expression in the SHORTROOT-SCARECROW Transcriptional Cascade through Opposing Activities of Both Activators and Repressors

TitleEstablishment of Expression in the SHORTROOT-SCARECROW Transcriptional Cascade through Opposing Activities of Both Activators and Repressors
Publication TypeJournal Article
Year of Publication2016
AuthorsSparks, EE, Drapek, C, Gaudinier, A, Li, S, Ansariola, M, Shen, N, Hennacy, JH, Zhang, J, Turco, G, Petricka, JJ, Foret, J, Hartemink, AJ, Gordan, R, Megraw, M, Brady, SM, Benfey, PN
JournalDev Cell
Volume39
Pagination585-596
Date Published12/2016
ISBN Number1878-1551 (Electronic)1534-5807 (Linking)
KeywordsArabidopsis Proteins/ genetics/ metabolism, Arabidopsis/ genetics/growth & development/ metabolism, Computer Simulation, Gene Expression Regulation, Plant, Gene Regulatory Networks, Genes, Plant, Genes, Reporter, Genes, Synthetic, Models, Genetic, Plant Roots/cytology/metabolism, Plants, Genetically Modified, Promoter Regions, Genetic, Repressor Proteins/genetics/metabolism, Trans-Activators/genetics/metabolism, Transcription Factors/ genetics/ metabolism, Two-Hybrid System Techniques
Abstract

Tissue-specific gene expression is often thought to arise from spatially restricted transcriptional cascades. However, it is unclear how expression is established at the top of these cascades in the absence of pre-existing specificity. We generated a transcriptional network to explore how transcription factor expression is established in the Arabidopsis thaliana root ground tissue. Regulators of the SHORTROOT-SCARECROW transcriptional cascade were validated in planta. At the top of this cascade, we identified both activators and repressors of SHORTROOT. The aggregate spatial expression of these regulators is not sufficient to predict transcriptional specificity. Instead, modeling, transcriptional reporters, and synthetic promoters support a mechanism whereby expression at the top of the SHORTROOT-SCARECROW cascade is established through opposing activities of activators and repressors.

Short TitleDevelopmental cell
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