CHKB and autism: Of the 26 genes with de novo splice altering missense and synonymous variants in ASD probands, 6 were previously reported in Simons Foundation for Autism Research Initiative Gene database (SFARI Gene) as having an association with ASD (CHKB, CACNA2D1, ERBB2IP, SYNGAP1, TCF4, USP45, S2 Table).