Patched Domain Containing Protein 1 (PTCHD1)

Autism is a common neurodevelopmental disorder with a complex mode of inheritance. Mutations in the X-chromosome PTCHD1 (patched-related) gene in seven families with autism spectrum disorder (ASD) and in three families with intellectual disability. A 167-kilobase microdeletion spanning exon 1 was found in two brothers, one with ASD and the other with a learning disability and ASD features; a 90-kilobase microdeletion spanning the entire gene was found in three males with intellectual disability in a second family. Deletions in the 5""" flanking region of PTCHD1 that disrupted a complex noncoding RNA and potential regulatory elements; equivalent changes were not found in male control individuals. Screen of PTCHD1 and its 5""" flanking regions suggests that this locus is involved in ~1% of individuals with ASD and intellectual disability.