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Molecular interactions coordinating the development of the forebrain and face
Ralph S Marcucio1, Dwight R Cordero, Diane Hu
1Department of Plastic and Reconstructive Surgery, Stanford University School of Medicine, 257 Campus Drive, Stanford, CA 94305, USA.
Developmental Biology
|June 28, 2005
Summary
Forebrain Sonic hedgehog (Shh) signaling is crucial for facial development. Inhibiting Shh disrupts forebrain polarity and facial patterning, leading to truncated beaks and altered skeletal structures.
Area of Science:
- Developmental biology
- Craniofacial development
- Molecular signaling
Background:
- The forebrain provides a structural framework for facial development.
- The forebrain also influences facial skeletal patterning through signaling molecules.
Purpose of the Study:
- To investigate the role of Sonic hedgehog (Shh) signaling from the forebrain in shaping the facial skeleton.
- To examine the molecular and skeletal consequences of inhibiting Shh signaling in the neuroectoderm.
Main Methods:
- Inhibition of Sonic hedgehog (Shh) signaling from the neuroectoderm in developing embryos.
- Analysis of molecular changes in gene expression patterns within the forebrain and facial ectoderm.
- Assessment of skeletal alterations in the developing face.
Main Results:
- Inhibition of Shh signaling disrupted forebrain dorsoventral polarity, altering gene expression.
- Shh induction in the frontonasal ectoderm was impaired, disrupting a key signaling center.
- Facial ectoderm and mesenchyme showed reduced expression of Shh pathway genes (Ptc, Gli1).
- Embryos exhibited truncated upper beaks and altered positioning of facial skeletal elements.
Conclusions:
- Forebrain Shh signaling regulates Shh expression in the face.
- Combined Shh signaling domains mediate frontonasal prominence patterning and facial outgrowth.
- Shh signaling from the forebrain is essential for normal craniofacial development.