Cleft lip and palate are developmental defects of the upper lip and roof of the mouth that are present at birth (congenital malformations). Cleft lip and palate may occur separately and in combination. Both malformations o...

IRF6-related disorders include a spectrum of disorders caused by abnormalities in the interferon regulatory factor 6 (IRF6) gene. Van der Woude syndrome (VWS) is at the mild end of the spectrum and popliteal pterygium syndrome (PPS) is at the seve...