Orofacial Cleft 8

A number sign (#) is used with this entry because of evidence that orofacial cleft-8 (OFC8) is caused by heterozygous mutation in the TP63 gene (603273) on chromosome 3q28.

Clinical Features

Leoyklang et al. (2006) reported a 4-year-old Thai girl with a surgically repaired bilateral complete cleft lip. Her parents were unaffected.

Basha et al. (2018) reported a family (CLP-1055) in which the proband and his father had orofacial cleft. The son had a unilateral, right-sided cleft lip. He had no limb anomaly, no ectodermal dysplasia, and no cardiac malformations. Follow-up until the age of 3.5 years showed growth and development within normal limits. His father had a unilateral, left-sided cleft lip. Both were reexamined for minor symptoms of other TP63 disorders and none were found.

Molecular Genetics

In a 4-year-old Thai girl with nonsyndromic orofacial cleft, Leoyklang et al. (2006) identified a missense mutation in the TP63 gene (R313G; 603273.0021).

In a family (CLP-1055) in which the proband and his father had orofacial cleft-8, Basha et al. (2018) identified heterozygosity for a 2-bp duplication (603273.0029) in the TP63 gene. The mutation, which was found by exome sequencing, segregated with the phenotype in the family and was not present in the gnomAD database.