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The Etiology of Cleft Palate Formation in BMP7-Deficient Mice

pmid: 23516636
pmc: PMC3597594
The Etiology of Cleft Palate Formation in BMP7-Deficient Mice
Palatogenesis is a complex process implying growth, elevation and fusion of the two lateral palatal shelves during embryogenesis. This process is tightly controlled by genetic and mechanistic cues that also coordinate the growth of other orofacial structures. Failure at any of these steps can result in cleft palate, which is a frequent craniofacial malformation in humans. To understand the etiology of cleft palate linked to the BMP signaling pathway, we studied palatogenesis in Bmp7-deficient mouse embryos. Bmp7 expression was found in several orofacial structures including the edges of the palatal shelves prior and during their fusion. Bmp7 deletion resulted in a general alteration of oral cavity morphology, unpaired palatal shelf elevation, delayed shelf approximation, and subsequent lack of fusion. Cell proliferation and expression of specific genes involved in palatogenesis were not altered in Bmp7-deficient embryos. Conditional ablation of Bmp7 with Keratin14-Cre or Wnt1-Cre revealed that neither epithelial nor neural crest-specific loss of Bmp7 alone could recapitulate the cleft palate phenotype. Palatal shelves from mutant embryos were able to fuse when cultured in vitro as isolated shelves in proximity, but not when cultured as whole upper jaw explants. Thus, deformations in the oral cavity of Bmp7-deficient embryos such as the shorter and wider mandible were not solely responsible for cleft palate formation. These findings indicate a requirement for Bmp7 for the coordination of both developmental and mechanistic aspects of palatogenesis.
- University of Bern Switzerland
- National and Kapodistrian University of Athens Greece
- University of Zurich Switzerland
- University of Zurich Switzerland
1000 Multidisciplinary, Science, Bone Morphogenetic Protein 7, Q, R, 610 Medicine & health, 1100 General Agricultural and Biological Sciences, Embryo, Mammalian, Immunohistochemistry, 10182 Institute of Oral Biology, Cleft Palate, Mice, 1300 General Biochemistry, Genetics and Molecular Biology, Medicine, Animals, In Situ Hybridization, Research Article, Cell Proliferation, Signal Transduction
1000 Multidisciplinary, Science, Bone Morphogenetic Protein 7, Q, R, 610 Medicine & health, 1100 General Agricultural and Biological Sciences, Embryo, Mammalian, Immunohistochemistry, 10182 Institute of Oral Biology, Cleft Palate, Mice, 1300 General Biochemistry, Genetics and Molecular Biology, Medicine, Animals, In Situ Hybridization, Research Article, Cell Proliferation, Signal Transduction
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