Meta-analysis identified three single-nucleotide polymorphisms, rs936938 (P=4.49 ?? 10(-8)), non-synonymous rs6537835 (P=3.26 ?? 10(-8)) and rs1877455 (P=8.70 ?? 10(-8)), and related haplotypes, AMPD1-NRAS-CSDE1, TRIM33 and TRIM33-BCAS2, associated with autism. 