Wnt Hedgehog Notch Pathways
Wnt Hedgehog Notch Pathways - Related Videos
02:33
Hedgehog Signaling Pathway
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2021
The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
02:33
Hedgehog Signaling Pathway
0 Views •
2023
The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
03:14
Notch Signaling Pathway
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2021
The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule. The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
03:14
Notch Signaling Pathway
0 Views •
2023
The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule. The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
02:54
Canonical Wnt Signaling Pathway
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2023
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...
FAQs
β-catenin functions as a central link between Wnt signaling and gene regulation. When Wnt ligands stabilize β-catenin, the protein can support changes in gene expression rather than being lost through normal cellular regulation. This mechanism helps connect an extracellular signal to biological outcomes involving cell fate, proliferation, stem-cell behavior, tissue maintenance, and organ formation.
Hedgehog signaling depends on the relationship between Patched and Smoothened. In the pathway state described here, Hedgehog signaling relieves Patched-mediated inhibition of Smoothened, allowing the signal to proceed. This regulatory step is important because it links ligand detection to developmental outcomes, including tissue patterning, cell-fate decisions, and organ formation.
Notch activation requires ligand-dependent cleavage of the Notch receptor. This processing releases the Notch intracellular domain, which provides the signaling component that connects receptor activation with subsequent cellular responses. Because the pathway influences cell fate, differentiation, tissue organization, and development, receptor cleavage represents a decisive control point for interpreting a neighboring-cell signal.
The pathways use different molecular control points. Wnt signaling regulates gene expression partly through β-catenin stabilization, Hedgehog signaling acts by relieving Patched-mediated inhibition of Smoothened, and Notch signaling depends on receptor cleavage that releases its intracellular domain. Comparing these mechanisms helps explain how distinct signaling systems can coordinate related processes such as development, cell fate, and tissue patterning.
Their combined study helps researchers examine how multicellular organisms coordinate communication, cell fate, tissue patterning, and development. The pathways are relevant to embryonic development, tissue maintenance, stem-cell behavior, and organ formation, while their interactions provide additional biological context. Considering them together can therefore clarify how multiple signaling systems contribute to organized tissue and organismal development.
Researchers investigate these pathways in diseases such as cancer because their components are connected with proliferation, differentiation, stem-cell behavior, and tissue maintenance. Individual pathway components also serve as targets for genetic analysis and therapeutic research. Such studies can examine how signaling changes relate to disease biology and can identify molecular points for further experimental or treatment-focused investigation.