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Canonical Wnt Signaling Pathway

Canonical 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...

Canonical Wnt Signaling Pathway

Canonical 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...

Non-Canonical Wnt Signaling Pathways

Non-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...

Non-Canonical Wnt Signaling Pathways

Non-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...

Regulation of Expression Occurs at Multiple Steps

Regulation of Expression Occurs at Multiple Steps

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.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...

Regulation of Expression Occurs at Multiple Steps

Regulation of Expression Occurs at Multiple Steps

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.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...

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Related Experiment Video

Updated: May 23, 2026

The Power of Simplicity: Sea Urchin Embryos as in Vivo Developmental Models for Studying Complex Cell-to-cell Signaling Network Interactions

The Power of Simplicity: Sea Urchin Embryos as in Vivo Developmental Models for Studying Complex Cell-to-cell Signaling Network Interactions

Published on: February 16, 2017

Biphasic wnt8a expression is achieved through interactions of multiple regulatory inputs.

Anand Narayanan¹, Arne C Lekven

¹Department of Biology, Texas A&M University, College Station, Texas 77843-3258, USA.

Developmental Dynamics : an Official Publication of the American Association of Anatomists

|April 5, 2012

Summary

Wnt8a gene expression during vertebrate development involves complex regulation. Two distinct phases, controlled by Nodal and No tail (Ntl) signaling, ensure proper axis formation.

More Related Videos

Modeling Paracrine Noncanonical Wnt Signaling In Vitro

Modeling Paracrine Noncanonical Wnt Signaling In Vitro

Published on: December 10, 2021

Related Experiment Videos

Last Updated: May 23, 2026

The Power of Simplicity: Sea Urchin Embryos as in Vivo Developmental Models for Studying Complex Cell-to-cell Signaling Network Interactions

The Power of Simplicity: Sea Urchin Embryos as in Vivo Developmental Models for Studying Complex Cell-to-cell Signaling Network Interactions

Published on: February 16, 2017

Modeling Paracrine Noncanonical Wnt Signaling In Vitro

Modeling Paracrine Noncanonical Wnt Signaling In Vitro

Published on: December 10, 2021

Area of Science:

Developmental biology
Gene regulation
Embryogenesis

Background:

Vertebrate axis development relies on wnt8a transcription in posterior mesoderm progenitors.
Two phases of wnt8a expression in zebrafish are known: Nodal-dependent (Phase I) and No tail (Ntl)-dependent (Phase II).

Purpose of the Study:

To elucidate the transcriptional mechanisms controlling wnt8a expression during zebrafish gastrulation.
To understand the regulatory inputs governing the two distinct phases of wnt8a expression.

Main Methods:

Identification and analysis of cis-regulatory regions (proximal and distal) upstream of wnt8a.
Investigation of enhancer activity and transcription factor involvement in regulating wnt8a expression.
Comparative analysis of wnt8a regulation in stickleback embryos.

Main Results:

Two cis-regulatory regions, proximal and distal, each containing a promoter, were identified.
A margin-specific enhancer within the proximal region is crucial for both Nodal and Ntl responses.
Phase I requires Nodal, Zbtb4, and the distal region; Phase II requires Ntl and the proximal region, with an additional mechanism for phase transition. Regulation appears conserved in stickleback.

Conclusions:

Wnt8a expression patterns arise from intricate interactions of multiple regulatory elements and signaling pathways.
The transition between early and mid-gastrula regulatory mechanisms for wnt8a is complex and conserved.