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Related Concept Videos

Non-Canonical Wnt Signaling Pathways01:41

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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...
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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...
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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Related Experiment Video

Updated: Feb 18, 2026

Modeling Paracrine Noncanonical Wnt Signaling In Vitro
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Multiprotein complexes governing Wnt signal transduction.

Melissa Gammons1, Mariann Bienz1

  • 1MRC Laboratory of Molecular Biology, Cambridge Biomedical Campus, Francis Crick Avenue, Cambridge CB2 0QH, UK.

Current Opinion in Cell Biology
|November 21, 2017
PubMed
Summary

This review details three key protein complexes in Wnt signaling: the Axin degradasome, which degrades β-catenin; the Wnt signalosome, which inactivates the degradasome; and the Wnt enhanceosome, which activates gene transcription. Understanding these complexes is crucial for Wnt pathway research.

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Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Biochemistry

Background:

  • Wnt signaling is a critical pathway regulating cell development and disease.
  • Three multiprotein complexes mediate signal transduction from the cell membrane to the nucleus.
  • These complexes include the β-catenin destruction complex (Axin degradasome), the Wnt signalosome, and the Wnt enhanceosome.

Purpose of the Study:

  • To review recent advances in understanding the assembly and function of key Wnt signaling complexes.
  • To elucidate the mechanistic principles governing these protein interactions.

Main Methods:

  • This is a review article, synthesizing existing research.
  • Focuses on mechanistic principles derived from published studies.

Main Results:

  • The Axin degradasome targets β-catenin for degradation in the absence of Wnt.
  • The Wnt signalosome inactivates the Axin degradasome, leading to β-catenin accumulation.
  • The Wnt enhanceosome facilitates β-catenin access to target genes, relieving repression.

Conclusions:

  • Recent advances provide mechanistic insights into the assembly and function of Wnt signaling complexes.
  • Understanding these complexes is vital for deciphering Wnt pathway regulation.
  • This knowledge may inform therapeutic strategies targeting Wnt-related diseases.