Among them, microdeletions and mutations in the X‐chromosomal PTCHD1 (patched domain containing 1) gene were described in patients with autism spectrum disorders (ASDs) and/or intellectual disability (ID; Chaudhry et al., 2015; Filges et al., 2011; Marshall et al., 2008; Noor et al., 2010). Here, PTCHD1 is linked to autism spectrum disorder.