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Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...
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Inducible, Cell Type-Specific Expression in Arabidopsis thaliana Through LhGR-Mediated Trans-Activation
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Inducible, Cell Type-Specific Expression in Arabidopsis thaliana Through LhGR-Mediated Trans-Activation

Published on: April 19, 2019

Multiple modular promoter elements drive graded brinker expression in response to the Dpp morphogen gradient.

Li-Chin Yao1, Sopheap Phin, Jane Cho

  • 1Department of Developmental and Cell Biology and the Developmental Biology Center, University of California Irvine, Irvine, CA 92612, USA.

Development (Cambridge, England)
|May 29, 2008
PubMed
Summary
This summary is machine-generated.

Decapentaplegic (Dpp) gradients pattern Drosophila development by regulating the brinker (brk) gene. Researchers found brk

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Using Confocal Analysis of Xenopus laevis to Investigate Modulators of Wnt and Shh Morphogen Gradients
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Using Confocal Analysis of Xenopus laevis to Investigate Modulators of Wnt and Shh Morphogen Gradients

Published on: December 14, 2015

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Last Updated: Jul 4, 2026

Inducible, Cell Type-Specific Expression in Arabidopsis thaliana Through LhGR-Mediated Trans-Activation
09:31

Inducible, Cell Type-Specific Expression in Arabidopsis thaliana Through LhGR-Mediated Trans-Activation

Published on: April 19, 2019

Using Confocal Analysis of Xenopus laevis to Investigate Modulators of Wnt and Shh Morphogen Gradients
08:10

Using Confocal Analysis of Xenopus laevis to Investigate Modulators of Wnt and Shh Morphogen Gradients

Published on: December 14, 2015

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Morphogen gradients are critical for embryonic development, controlling cell specification and tissue patterning.
  • In Drosophila, the Decapentaplegic (Dpp) morphogen gradient regulates target gene expression, including the nuclear repressor brinker (brk).
  • Understanding how the brk promoter interprets the Dpp gradient is key to deciphering developmental patterning mechanisms.

Purpose of the Study:

  • To elucidate the regulatory mechanism by which the brk promoter interprets the Dpp activity gradient.
  • To investigate the complex enhancer logic of the brk promoter in response to Dpp signaling.

Main Methods:

  • Analysis of the brk promoter's regulatory regions and their functional modules.
  • Investigation of binding sites for the Schnurri/Mad/Medea (SMM) complex and their interaction with activation regions.
  • Assessment of the role of C-terminal Binding Protein (CtBP) in Dpp-mediated repression.

Main Results:

  • The brk regulatory region comprises multiple independent modules capable of driving brk-like expression.
  • Each module contains SMM binding sites linked to activation regions, mediating Dpp-dependent repression.
  • The SMM repression complex functions via a distance-dependent mechanism, likely involving CtBP, integrating inputs from multiple modules.

Conclusions:

  • The brk promoter exhibits a complex enhancer logic, with multiple modules integrating Dpp gradient information.
  • This intricate promoter organization allows for precise and robust interpretation of the Dpp gradient.
  • The findings provide essential insights into Dpp-dependent patterning and transcriptional repression mechanisms in development.