Orofaciodigital syndrome type 6

Orofaciodigital syndrome type 6 (OFD6), also known as Váradi-Papp syndrome or Váradi syndrome, is a rare autosomal recessive genetic disorder characterized by the combination of oral, facial, and digital anomalies along with cerebellar malformations. It is distinguished from other orofaciodigital syndromes primarily by the presence of a molar tooth sign on brain MRI, reflecting cerebellar vermis hypoplasia or aplasia, which places it within the spectrum of Joubert syndrome and related disorders. Mutations in several genes have been associated with this condition, including C5orf42 (also known as CPLANE1) and TMEM216. Key clinical features include oral findings such as tongue hamartomas (nodules), cleft lip and/or palate, lingual frenula, and dental anomalies. Facial features may include hypertelorism, broad nasal bridge, and midline cleft of the upper lip. Digital anomalies are prominent and include central polydactyly (Y-shaped metacarpal), preaxial and postaxial polydactyly, brachydactyly, and syndactyly. The central nervous system is significantly affected, with cerebellar vermis hypoplasia or aplasia leading to the characteristic molar tooth sign, intellectual disability of variable severity, hypotonia, and ataxia. Some patients may also have hypothalamic hamartomas and other brain malformations. There is no cure for OFD6, and management is supportive and multidisciplinary. Treatment may include surgical correction of cleft lip/palate and polydactyly, speech therapy, physical therapy for motor delays, and educational support for intellectual disability. Neurological monitoring is important given the cerebellar involvement. Genetic counseling is recommended for affected families. Prognosis varies depending on the severity of the central nervous system involvement, with some patients experiencing significant developmental delays while others have milder presentations.

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