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Center for Craniofacial Molecular Biology, School of Dentistry, University of Southern California, 2250 Alcazar Street, CSA 103, Los Angeles, CA 90033;
*corresponding author, ychai{at}usc.edu
Members of the transforming growth factor-ß (TGF-ß) superfamily regulate cell proliferation, differentiation, and apoptosis, and control the development and maintenance of most tissues. TGF-ß signal is transmitted through the phosphorylation of Smad proteins by TGF-ß receptor serine/threonine kinase. During craniofacial development, TGF-ß may regulate the fate specification of cranial neural crest cells. These cells are multipotent progenitors and capable of producing diverse cell types upon differentiation. Here we summarize evidence that TGF-ß ligands and their signaling intermediates have significant roles in patterning and specification of cranial neural crest cells. The biological function of TGF-ß is carried out through the regulation of transcriptional factors during embryogenesis.
Key words. Cranial neural crest (CNC) cells, Msx, Smads, TGF-ß, TGF-ß receptors, tooth
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