Purified and diluted samples were sent to the Neuroscience Genomics Core at the University of California, Los Angeles, for single nucleotide polymorphism (SNP) genotyping assay. Samples were run on an Illumina BeadLab platform using an Illumina Infinium PsychArray BeadChip array (San Diego, CA). This chip includes 265,000 tag-SNPs across the genome, with about 50,000 markers associated with common psychiatric disorders. Chips were scanned on an Illumina iScan confocal laser, with genotype calls performed using manufacture’s parameters in GenomeStudio (Illumina, v 2011.1, genotyping module v1.9.5). Data was converted to PLINK (v1.90b3v) format for subsequent analyses (Purcell et al., 2007).
