The Function and Regulatory Network of Pax9 Gene in Palate Development
11 Department of Orthodontics, Ninth People's Hospital, School of Stomatology, Shanghai Key Laboratory of Stomatology, Shanghai Jiao Tong University, Shanghai, China.
Journal of Dental Research
|December 26, 2018
Summary
Paired box gene 9 (Pax9) is crucial for palate development and prevents cleft palate by regulating palatal shelf growth, elevation, and fusion through genetic interactions.
Area of Science:
- Developmental Biology
- Genetics
- Craniofacial Development
Background:
- Cleft palate is a common congenital deformity resulting from disruptions in palatogenesis.
- Paired box gene 9 (Pax9) is a key regulator of palatogenesis, essential for normal palate formation in humans and mice.
Purpose of the Study:
- To review the current understanding of Pax9's functions during palatogenesis.
- To emphasize Pax9's genetic interactions and their roles in palate development, particularly in shelf growth, elevation, and fusion.
Main Methods:
- Review of existing literature on Pax9 function and genetic interactions during palatogenesis.
- Analysis of Pax9 expression patterns in epithelial and mesenchymal cells.
- Examination of Pax9-deficient murine models to observe palatogenesis defects.
Main Results:
- Pax9-deficient murine palatal shelves show impaired elongation, delayed elevation, and failed fusion.
- Pax9 interacts with multiple genes and pathways (e.g., OSR2, FGF10, TGFβ3, WNT) in mesenchyme and mediates epithelial-mesenchymal communication.
- Abnormal gene expression (Osr2, Bmpr1a) in Pax9 mutants contributes to delayed elevation and other developmental defects.
Conclusions:
- Pax9 is vital for regulating multiple stages of palatogenesis, including growth, elevation, and fusion.
- Pax9's interactions with various genetic pathways highlight its central role in coordinating palatogenesis.
- Further research into Pax9 mechanisms, especially during palate elevation and fusion, is warranted.
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