NEK4 and schizophrenia: One was found on chromosome 3p21, where the index schizophrenia-associated SNP (rs2535627, P for schizophrenia association in the PGC GWAS= 4.0 × 10−11) itself was identified as an sQTL SNP significantly associated with an Alt EX of NEK4 (double-corrected P for sQTL=7.8 × 10−5) (Fig. 5a).