GRIN2A and schizophrenia: Previous studies have identified four genes which show both fine-mapped common variant signals in schizophrenia GWAS and an excess of RCVs in cases at either exome-wide significance (GRIN2A and SP4) or FDR < 5% (STAG1 and FAM120A)4,12, providing strong evidence for their role in schizophrenia.