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Notch signalling defines critical boundary during budding in Hydra
Sandra Münder1, Tina Käsbauer, Andrea Prexl
1Department of Biology 2, Ludwig-Maximilians-Universität München, Munich, Germany.
Developmental Biology
|June 11, 2010
Summary
Notch signaling is crucial for Hydra budding, sharpening gene expression boundaries for proper bud development. Inhibition disrupts morphogenesis, leading to two-headed Hydra and preventing bud detachment.
Area of Science:
- Developmental biology
- Cell signaling
- Evolutionary biology
Background:
- Tissue boundary formation is vital in development, often regulated by Notch, FGF, and Wnt pathways in bilaterians.
- Hydra vulgaris, a simple pre-bilaterian, exhibits asexual reproduction with a distinct parent-bud boundary.
- Previous studies identified FGF-receptor (kringelchen) and Wnt pathway components at this boundary, but their roles were unclear.
Purpose of the Study:
- To investigate the role of Notch signaling in boundary formation during Hydra budding.
- To elucidate the molecular mechanisms underlying bud morphogenesis and detachment in Hydra.
Main Methods:
- Utilized the presenilin inhibitor DAPT to block Notch signaling in Hydra vulgaris.
- Analyzed gene expression patterns of kringelchen, HyHes (Notch target), and MMP-A3.
- Observed morphological changes and budding outcomes in inhibited and control Hydra specimens.
Main Results:
- Notch signaling sharpens kringelchen expression into a distinct boundary line during late budding stages.
- Inhibition of Notch signaling with DAPT resulted in diffused kringelchen expression and abolished HyHes and MMP-A3 expression.
- Blocking Notch signaling prevented bud constriction, foot cell differentiation, and detachment, leading to two-headed Hydra formation.
Conclusions:
- Notch signaling is essential for establishing precise gene expression stripes required for bud differentiation and foot formation in Hydra.
- The study reveals Notch signaling's role in regulating mesoglea narrowing and bud constriction during Hydra asexual reproduction.
- Disruption of Notch signaling leads to developmental defects, highlighting its conserved importance in morphogenetic processes.
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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...
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...
03:14Notch Signaling Pathway
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...
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...
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