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BMP signaling is essential for development of skeletogenic and neurogenic cranial neural crest
B Kanzler1, R K Foreman, P A Labosky
1Max-Planck Institute of Immunobiology, Stübeweg 51, D-79108 Freiburg, Germany.
Abstract:
BMP signaling is essential for a wide variety of developmental processes. To evaluate the role of Bmp2/4 in cranial neural crest (CNC) formation or differentiation after its migration into the branchial arches, we used Xnoggin to block their activities in specific areas of the CNC in transgenic mice. This resulted in depletion of CNC cells from the targeted areas. As a consequence, the branchial arches normally populated by the affected neural crest cells were hypomorphic and their skeletal and neural derivatives failed to develop. In further analyses, we have identified Bmp2 as the factor required for production of migratory cranial neural crest. Its spatial and temporal expression patterns mirror CNC emergence and Bmp2 mutant embryos lack both branchial arches and detectable migratory CNC cells. Our results provide functional evidence for an essential role of BMP signaling in CNC development.
Insights
Bone morphogenetic protein (BMP) signaling is crucial for cranial neural crest (CNC) development. Blocking BMP activity in mice led to the depletion of CNC cells, hindering branchial arch and skeletal development.
Area of Science:
- Developmental biology
- Molecular biology
- Genetics
Background:
- Bone morphogenetic protein (BMP) signaling pathways regulate numerous developmental processes.
- Cranial neural crest (CNC) cells are vital for the development of craniofacial structures.
Purpose of the Study:
- To investigate the role of Bmp2/4 in cranial neural crest (CNC) cell formation and differentiation.
- To elucidate the function of BMP signaling in the development of branchial arches and their derivatives.
Main Methods:
- Utilized Xnoggin to inhibit BMP activity in specific CNC regions of transgenic mice.
- Analyzed Bmp2 expression patterns and examined Bmp2 mutant embryos for developmental defects.
Main Results:
- Inhibition of BMP signaling resulted in significant depletion of CNC cells in targeted areas.
- Branchial arches and their skeletal/neural derivatives failed to develop properly in affected mice.
- Bmp2 was identified as essential for the production of migratory CNC cells; Bmp2 mutant embryos lacked branchial arches and CNC cells.
Conclusions:
- BMP signaling, particularly Bmp2, plays an indispensable role in the emergence and development of cranial neural crest (CNC) cells.
- Disruption of BMP signaling severely impacts branchial arch formation and the development of craniofacial structures.