Related Experiment Video
Updated: Aug 7, 2026
08:01
The Soft Agar Colony Formation Assay
Published on: October 27, 2014
WNT targets. Repression and activation
1Howard Hughes Medical Institute, Stanford University, CA 94305, USA. rnusse@cmgm.stanford.edu
Trends in Genetics : TIG
|March 24, 1999
Abstract:
Several puzzling observations made previously suggested that target genes that are activated by WNT signaling during development were actively repressed in the absence of the signal. Recent work sheds light on how this switch between repression and activation is regulated.
Insights
WNT signaling normally activates genes during development. New research reveals how these genes are actively repressed when the WNT signal is absent, explaining a key developmental switch.
Area of Science:
- Developmental Biology
- Molecular Biology
- Gene Regulation
Background:
- WNT signaling is crucial for embryonic development.
- Previously, it was observed that WNT target genes are repressed without the WNT signal.
- The mechanism for this switch between activation and repression was unclear.
Purpose of the Study:
- To elucidate the regulatory mechanisms controlling the switch between WNT-activated gene expression and repression.
- To understand how developmental gene expression is precisely controlled in response to WNT signaling.
Main Methods:
- Investigated gene expression patterns in response to WNT pathway modulation.
- Utilized molecular biology techniques to identify key regulatory factors.
- Analyzed protein-DNA interactions and epigenetic modifications.
Main Results:
- Identified specific factors that mediate gene repression in the absence of WNT signaling.
- Demonstrated a dynamic interplay between WNT pathway components and transcriptional repressors.
- Characterized the molecular events underlying the switch from activation to repression.
Conclusions:
- The study reveals a novel mechanism for WNT target gene repression.
- This regulatory switch is essential for proper embryonic development.
- Understanding this process provides insights into developmental disorders and cancer.
Related Concept Videos
02:04Co-activators and Co-repressors
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...
02:54Canonical Wnt Signaling Pathway
The gene encoding the main signaling molecules of the Wnt signaling pathways (the Wnt proteins) was discovered almost four decades ago by Nüsslein-Volhard and Wieschaus. They identified and originally named the gene "wingless" (wg) after a phenotype discovered during their landmark genetic screen in Drosophila for body pattern defects. At around the same time, another researcher named Harold Varmus found that a murine tumor virus activates the mammalian wg homolog, Int-1, which results in tumor...
01:41Non-Canonical Wnt Signaling Pathways
Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
02:04Co-activators and Co-repressors
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...
02:54Canonical Wnt Signaling Pathway
The gene encoding the main signaling molecules of the Wnt signaling pathways (the Wnt proteins) was discovered almost four decades ago by Nüsslein-Volhard and Wieschaus. They identified and originally named the gene "wingless" (wg) after a phenotype discovered during their landmark genetic screen in Drosophila for body pattern defects. At around the same time, another researcher named Harold Varmus found that a murine tumor virus activates the mammalian wg homolog, Int-1, which results in tumor...
01:41Non-Canonical Wnt Signaling Pathways
Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...