Sequencing of the mutated gene identified an A to T transversion at base pair 74210425 (v38) on Chromosome 10 in the GenBank genomic region NC_000076 encoding Pcdh15. The mutation corresponds to residue 953 in the ENSMUST00000105426 mRNA sequence within exon 7 of 35 total exons. The mutation results in an aspartic acid (D) to valine (V) substitution at residue 183.