Fig. 5.
Identification of genes and DNAm sites associated with four brain-related traits. Genes (DNAm sites) associated with the brain-related traits were identified by a SMR analysis of GWAS data with eQTL (mQTL) data from brain and blood samples. The four brain-related traits are smoking, IQ, SCZ, and EduYears. a, c show the number of genes (DNAm sites) with at least one significant SNP at P < 5 × 10−8 in different data sets. b, d show the number of genes (DNAm sites) associated with traits identified in different data sets. Sample sizes of the brain studies: GTEx-brain (n = ~233), CMC (n = 467), ROSMAP (n = 494), Brain-eMeta (neff = ~1194), and Jaffe et al. (n = 526). Sample sizes of the blood studies: CAGE (n = 2765), eQTLGen (n = 14,115), LBC + BSGS (n = 1980)