GRIK4 and schizophrenia: We identified 4 truncating mutants and 36 rare missense mutations with MAFs less than 0.5% in the GRIK gene family from 516 patients with schizophrenia, including 5 variants (GRIK1p.Phe24fs, GRIK1p.Arg203Leu, GRIK1p.His336Arg, GRIK4p.Gln342Ter, and GRIK4p.His403Gln) that were not observed among 1517 healthy controls from the Taiwan BioBank, the gnomAD database, and 1000 Genomes Project.