Recurrent DNMs harbored in the SLC6A1 and TCF7L2 genes were shared among ID, ASD, and DD (De Rubeis et al., 2014; Iossifov et al., 2014; Deciphering Developmental Disorders, 2015, 2017; Yuen et al., 2016), further highlighting the shared genetic basis of DNMs in neuropsychiatric disorders. The gene discussed is SLC6A1; the disease is dentin dysplasia.