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Prokaryotic Transcriptional Activators and Repressors

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Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...

Prokaryotic Transcriptional Activators and Repressors

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Related Experiment Video

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A High-content In Vitro Pancreatic Islet β-cell Replication Discovery Platform

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Brinker requires two corepressors for maximal and versatile repression in Dpp signalling.

P Hasson¹, B Müller, K Basler

¹Department of Biochemistry, The Hebrew University-Hadassah Medical School, PO Box 12272, Jerusalem 91120, Israel.

The EMBO Journal

|October 13, 2001

Summary

Brinker (Brk) protein uses multiple repression mechanisms to control gene expression in Drosophila development. It recruits different corepressors, like Groucho and CtBP, to regulate distinct target genes effectively.

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Area of Science:

Developmental Biology
Molecular Genetics
Drosophila melanogaster research

Background:

Decapentaplegic (Dpp) acts as a morphogen, guiding embryonic and appendage development in Drosophila.
Dpp gradients pattern the wing imaginal disc, inducing gene expression based on concentration.
Brinker (Brk), a Dpp target gene, forms an opposing gradient crucial for Dpp signaling interpretation.

Purpose of the Study:

Investigate the repression mechanisms of Brinker (Brk).
Determine how Brk utilizes corepressors Groucho and CtBP.
Elucidate the role of these corepressors in regulating Dpp-responsive genes.

Main Methods:

Analysis of transcriptional outcomes after genetic removal of corepressors.
Ectopic expression of Brk variants in Drosophila embryos.
Characterization of Brk's repression domain.

Main Results:

Brk possesses a functional and transferable repression domain.
Brk recruits corepressors Groucho and CtBP via this domain.
Corepressors are alternatively utilized by Brk for repressing distinct Dpp-responsive genes.

Conclusions:

Brk employs multiple strategies to repress its target genes.
Differential recruitment of corepressors allows Brk to regulate a wide range of Dpp target promoters.
This mechanism provides flexibility in controlling complex developmental gene expression patterns.