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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...

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...

Catenins

Catenins

Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the adherens...

Microtubules in Signaling

Microtubules in Signaling

The primary cilium, made up of microtubules, acts as antennae on the cell surfaces for relaying external stimuli into the cells. These fine hair-like structures are present, generally one per cell. These are non-motile cilia in a 9+0 microtubules arrangement, where the central pair of microtubules are absent. The primary cilia arise from the basal body embedded in the cell membrane. Intraflagellar transport (IFT) carries requisite proteins from the cytoplasm to the cilium because the primary...

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Related Experiment Video

Updated: Jul 18, 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

The Wnt code: cnidarians signal the way.

C Guder¹, I Philipp, T Lengfeld

¹Department of Molecular Evolution and Genomics, University of Heidelberg, Heidelberg, Germany.

|December 5, 2006

Summary

Cnidarians utilize a complex Wnt signaling pathway for development and regeneration, involving numerous Wnt genes and antagonists. This ancient genetic system predates bilaterians and was crucial for early animal body plan evolution.

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: Jul 18, 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
Evolutionary Biology
Genetics

Background:

Cnidarians, as simple metazoans with nervous systems, possess remarkable regeneration capabilities.
The canonical Wnt pathway is implicated in organizer formation and regeneration in Hydra.
Wnt signaling plays a critical role in cnidarian embryogenesis.

Purpose of the Study:

To investigate the complexity and evolutionary significance of the Wnt gene family in cnidarians.
To explore the role of Wnt signaling in patterning the embryonic axis of Nematostella vectensis.
To understand the evolutionary origins of Wnt gene complexity in early multicellular animals.

Main Methods:

Identification and characterization of Wnt gene subfamilies in the sea anemone Nematostella vectensis.
Analysis of Wnt gene expression patterns along the embryonic oral-aboral axis.
Comparative analysis of Wnt pathway components (ligands and antagonists) with other animal groups.

Main Results:

Eleven of the twelve known Wnt gene subfamilies were identified in Nematostella vectensis.
Distinct Wnt genes showed serial and overlapping expression domains, forming a 'wnt code' along the embryonic axis.
Conserved Wnt antagonists, such as Dkk 1/2/4, were found in cnidarians, similar to chordates.

Conclusions:

The Wnt pathway, with its complex gene repertoire and antagonists, was essential for patterning the primary body axis in the common ancestor of cnidarians and bilaterians.
The evolution of Wnt gene complexity around 650 million years ago coincided with the origin of multicellularity and the diversification of eumetazoan body plans.
The findings suggest a significant expansion of the genetic repertoire in early animal evolution, laying the groundwork for complex body architectures.