We used a luciferase reporter assay to compare the effects on the p63 transactivation (TA) activity of c.1697delG with that of the p.Arg280Cys and p.Gln634X mutations, associated with ectrodactyly-ectodermal dysplasia-cleft lip/palate syndrome and isolated split hand/foot malformation, respectively.
Sequencing showed a CGT-->TGT missense mutation (R280C) in exon 7, previously reported to cause EEC in four families, and ectrodactyly alone (split hand-foot malformation) in one sporadic case and one large kindred.