Mutations in BMP4 are associated with subepithelial, microform, and overt cleft lip

Area of Science:

• Genetics
• Developmental Biology
• Craniofacial Anomalies

Background:

• Cleft lip with or without cleft palate (CL/P) is a complex craniofacial birth defect.
• The clinical spectrum of CL/P may include less apparent forms like microforms and subepithelial defects.

Purpose of the Study:

• To investigate the role of the BMP4 gene in various forms of cleft lip and palate.
• To determine if BMP4 mutations are associated with microform clefts and subepithelial orbicularis oris muscle defects.

Main Methods:

• Genetic analysis of the BMP4 gene in patients with different CL/P phenotypes.
• Comparison of mutation frequencies between patient groups and controls.

Main Results:

• Missense and nonsense mutations in BMP4 were identified in patients with microform clefts (1/30), subepithelial orbicularis oris muscle defects (2/87), and overt CL/P (5/968).
• No BMP4 mutations were found in the control group (0/529).

Conclusions:

• The findings confirm that microforms and subepithelial orbicularis oris muscle defects are part of the CL/P spectrum.
• BMP4 mutations are implicated in CL/P, suggesting a role in craniofacial development and potentially wound healing.