TCF4 and schizophrenia: We used MAGMA to test for association between TCF4 bindings sites and schizophrenia (PGC2 GWAS) correcting for gene length and linkage disequilibrium (LD).39 MAGMA reported a nominally significant enrichment of TCF4 target genes amongst schizophrenia risk loci (P = .049) after correcting for gene length and LD.