| Pathway Name | Key Components/Genes | Role in Palatogenesis | Consequence of Disruption | Associated Mouse Models |
|---|---|---|---|---|
| TGF-β | **TGFB3**, **TGFBR2**, **SMAD2**, **TAK1**, p38 MAPK, **CTNNB1**-linked regulation of TGF-β3 | Essential for palatal shelf adhesion and fusion; promotes midline epithelial seam (MES) breakdown, periderm desquamation, and epithelial remodeling during fusion; also modulates epithelial-mesenchymal interactions and influences Shh signaling via lipid metabolism (pqac-00000025, pqac-00000026, pqac-00000029, pqac-00000048) | Failure of palatal fusion, persistent MES, delayed/abnormal periderm removal, cleft palate (pqac-00000026, pqac-00000048) | **Tgfbr2** conditional inactivation in cranial neural crest causes cleft palate and calvarial defects (pqac-00000046) |
| BMP | **BMP2**, **BMP4**, **BMPR1A**, **NOGGIN**, p-SMAD1/5/8, **PAX9**-BMP4 network | Regulates palatal mesenchymal proliferation, differentiation, apoptosis, and anterior-posterior patterning; interacts with Shh to stimulate mesenchymal proliferation; crucial in cranial neural crest-derived mesenchyme (pqac-00000025, pqac-00000028, pqac-00000029) | Dysregulated BMP signaling causes cleft palate/cleft lip, impaired palatal growth, abnormal patterning; BMP antagonism (Noggin) leads to retarded growth and cleft palate (pqac-00000025, pqac-00000028) | Mesenchymal/neural crest **Bmpr1a** loss causes severe craniofacial defects; **Msx1**-null cleft palate can be linked to altered BMP/Shh network activity (pqac-00000025, pqac-00000046) |
| SHH (Sonic Hedgehog) | **SHH**, **SMO**, primary cilia, **FOXF1/2**, **FGF10**, **BMP2**, **PTCH** | Drives palatal shelf outgrowth through reciprocal epithelial-mesenchymal signaling; maintains proliferation of palatal epithelial and mesenchymal cells; participates in regional patterning and works in feedback with FGF and BMP pathways (pqac-00000027, pqac-00000028, pqac-00000029, pqac-00000031, pqac-00000032) | Reduced cell proliferation, defective palatal outgrowth, impaired shelf development, cleft palate (pqac-00000029, pqac-00000031, pqac-00000032) | Epithelial **Shh** inactivation impairs palatal cell proliferation; mesodermal **Smo** inactivation disrupts outgrowth (pqac-00000031, pqac-00000044) |
| WNT | Canonical **WNT/β-catenin (CTNNB1)**, **PAX9**, **OSR2**, **WNT5A**, **SFRP2** | Regulates proliferation, migration, differentiation, mediolateral/anterior-posterior patterning, and secondary palate development; also regulates **TGFB3** expression and integrates with BMP/FGF/SHH signaling (pqac-00000025, pqac-00000026, pqac-00000028, pqac-00000029) | Disrupted WNT signaling contributes to cleft pathogenesis through abnormal proliferation/patterning; persistent canonical WNT can induce ectopic mesenchymal condensation, soft palate agenesis, and impaired palatal osteogenesis (pqac-00000025, pqac-00000029) | **Osr2-cre; Ctnnb1** constitutive activation model shows abnormal mesenchymal condensation, impaired osteogenesis, and soft palate defects; **Osr2−/−; Pax9−/−** embryos exhibit cleft palate (pqac-00000044) |
| FGF | **FGF10**, **FGFR2b**, **FGF7**, **FGF18**, **JAG2/NOTCH**, **FOXF1/2** | Controls epithelial-mesenchymal crosstalk, palatal epithelial differentiation, shelf outgrowth, and proliferation; **FGF10-FGFR2b** maintains epithelial Shh and coordinates with Jag2-Notch signaling; **FGF7** can suppress Shh (pqac-00000026, pqac-00000028, pqac-00000029, pqac-00000030, pqac-00000031, pqac-00000032) | Cleft palate due to impaired shelf outgrowth, defective epithelial differentiation/adhesion, and disrupted epithelial-mesenchymal signaling (pqac-00000026, pqac-00000030, pqac-00000031) | **Fgf10−/−** mice develop cleft palate with impaired palatal shelf outgrowth; **Fgf10/Fgfr2b** disruption causes cleft palate through disturbed epithelial-mesenchymal interactions (pqac-00000044, pqac-00000046) |


*Table: This table summarizes the core developmental signaling pathways implicated in palatogenesis and cleft lip/palate pathogenesis, linking pathway-level functions to disruption phenotypes and representative mouse models. It is useful for connecting mechanistic biology with disease annotations and experimental systems.*