DLG4 and Williams syndrome: Seven single nucleotide polymorphisms (SNPs) on this array mapped to DLG4 (Supplementary Table 10), including rs17203281, which has previously been associated with neuropsychiatric disease, significantly predicting schizophrenia risk53, 54 and changes in cortical regional volume in patients with Williams’ syndrome, a well-characterised genetic syndrome overlapping with autism31.