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Updated: Aug 18, 2026
Method of Studying Palatal Fusion using Static Organ Culture
Published on: September 19, 2015
Epithelial breakdown in the palatal processes of mouse fetuses with spontaneous cleft lip and palate
Insights
Mechanical obstruction in A/J mice prevents palatal fusion, leading to cleft lip and palate. Epithelial disruption occurs on day 16, with continuity reestablished by day 17, challenging prior hypotheses on fusion prerequisites.
Area of Science:
- Developmental Biology
- Craniofacial Development
- Teratology
Background:
- Cleft lip and palate are common congenital anomalies.
- The etiology of clefting involves genetic and environmental factors.
- Palatal fusion is a critical developmental process.
Purpose of the Study:
- To investigate the mechanism of palatal fusion failure in A/J mice.
- To examine the role of epithelial integrity during palatal development.
- To test the hypothesis that contact is required for epithelial degeneration.
Main Methods:
- Histological examination of A/J mouse fetuses at specific gestational days.
- Analysis of palatal process morphology and epithelial continuity.
- Comparison of developmental stages with normal palatal fusion.
Main Results:
- Mechanical obstruction prevents contact and fusion of palatal processes in A/J mice.
- Epithelial covering on palatal processes was thin at day 15 1/2.
- Complete epithelial disruption occurred by day 16, exposing mesenchyme.
- Epithelial continuity was restored by day 17.
Conclusions:
- Mechanical obstruction is a key factor in preventing palatal fusion in this model.
- Epithelial degeneration and discontinuity precede reestablishment of continuity.
- Palatal shelf contact is not essential for the initial epithelial breakdown during fusion.
Abstract:
Contact and fusion of the palatal processes are prevented by mechanical obstruction in A/J mice with spontaneous cleft lip and palate. Histological examination of cleft-lip fetuses revealed a very thin epithelial covering on the tip of the palatal process at day 15 1/2 of gestation, when the palate normally undergoes fusion, but at day 16 the palatal epithelium was completely disrupted, exposing the underlying mesenchyme. This epithelial discontinuity lasted only one day--by day 17 epithelial continuity was reestablished. These findings support the hypothesis that contact between the palatal shevles is not a prerequisite for epithelial degeneration.
