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Sonic hedgehog is required for cardiac outflow tract and neural crest cell development
I Washington Smoak1, N A Byrd, R Abu-Issa
1North Carolina State University, Raleigh, 27695, USA.
Developmental Biology
|June 7, 2005
Summary
Sonic hedgehog (Shh) signaling is crucial for embryonic development, particularly in pharyngeal arch and cardiovascular patterning. Its absence causes severe craniofacial and cardiac defects, resembling tetralogy of Fallot.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- The Hedgehog signaling pathway plays a vital role in embryonic development.
- Sonic hedgehog (Shh) is a key signaling molecule in this pathway.
- Shh is essential for patterning various embryonic structures.
Purpose of the Study:
- To investigate the role of Sonic hedgehog (Shh) in pharyngeal arch and cardiovascular development.
- To analyze the effects of Shh deficiency on craniofacial and cardiac patterning.
- To elucidate the mechanism by which Shh influences neural crest cell development.
Main Methods:
- Analysis of Sonic hedgehog (Shh) null mouse embryos.
- Examination of pharyngeal arch and cardiovascular development.
- Assessment of neural crest cell (NCC) migration and development.
Main Results:
- Shh deficiency leads to widespread pharyngeal arch developmental failure.
- Cardiac defects include arch artery and outflow tract patterning abnormalities.
- Shh acts early to restrict neural crest cell (NCC) population domains, not as a direct survival factor.
Conclusions:
- Sonic hedgehog (Shh) is indispensable for normal pharyngeal arch, craniofacial, and cardiovascular development.
- Shh-deficient embryos exhibit defects mimicking severe tetralogy of Fallot with pulmonary atresia.
- Shh signaling regulates neural crest cell (NCC) migration patterns during early embryonic development.
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