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Updated: Jul 14, 2026
Midface Hypoplasia and Cranial Base Morphology in Syndromic Craniosynostosis: A Comparative Analysis Study Using a Predictive Regression Model
Published on: November 4, 2025
Stage-dependent craniofacial defects resulting from Sprouty2 overexpression
L Henry Goodnough1, Samantha A Brugmann, Diane Hu
1Department of Surgery, Division of Plastic and Reconstructive Surgery, Stanford University School of Medicine, Stanford, California 94305, USA.
Abstract:
Sprouty genes encode intracellular regulators of receptor tyrosine kinases that function in a variety of developmental events. Although mice carrying null mutations in Sprouty genes exhibit craniofacial anomalies, the precise role of these regulatory proteins in facial development remains unclear. Here, we show that overexpression of spry2 at the initiation of craniofacial development results in a dramatic arrest in outgrowth of the facial prominences. Although endogenous spry2 and fibroblast growth factor 8 (fgf8) are coexpressed throughout much of craniofacial development, overexpression of spry2 did not alter the spatiotemporal patterns of fgf target gene expression. The morphological consequences of spry2 overexpression were specific: all of the facial prominences were truncated, but despite this gross malformation, the programs of osteogenesis and chondrogenesis were not impaired. Collectively, these data suggest that Sprouty2 plays a role in the outgrowth of facial prominences independent of canonical Fgf signaling.
Insights
Sprouty2 regulates facial prominence outgrowth during development. Overexpression arrests facial development, but bone and cartilage formation remain unaffected, suggesting an FGF-independent role.
Area of Science:
- Developmental biology
- Molecular genetics
- Craniofacial development
Background:
- Sprouty genes are intracellular regulators of receptor tyrosine kinases.
- Sprouty proteins are involved in various developmental events.
- The exact function of Sprouty proteins in facial development is not fully understood.
Purpose of the Study:
- To investigate the role of Sprouty2 in craniofacial development.
- To determine the effects of spry2 overexpression on facial prominence outgrowth.
- To elucidate the relationship between Sprouty2 and fibroblast growth factor 8 (FGF8) signaling in facial development.
Main Methods:
- Overexpression of spry2 in mice at the initiation of craniofacial development.
- Analysis of morphological consequences on facial prominences.
- Assessment of FGF8 target gene expression patterns.
- Evaluation of osteogenesis and chondrogenesis programs.
Main Results:
- Spry2 overexpression led to a significant arrest in facial prominence outgrowth.
- Endogenous spry2 and FGF8 were coexpressed during craniofacial development.
- Spry2 overexpression did not alter FGF8 target gene expression.
- Despite truncated facial prominences, osteogenesis and chondrogenesis were not impaired.
Conclusions:
- Sprouty2 plays a critical role in the outgrowth of facial prominences.
- This role appears to be independent of canonical FGF signaling.
- Sprouty2 is a key regulator of craniofacial morphogenesis.
