Causal effect of gene expression in blood on asthma. SMR, Summary Data-based Mendelian Randomization; TSMR: Two-Sample Mendelian Randomization; eQTL, expression quantitative trait loci; OR, odds ratio; CI, confidence interval; _S, by using SMR; _T, by using TSMR; Discovery, exposure from eQTLGen, and outcome from UK Biobank (UKB); Finngen, exposure from Gtex and outcome from Finngen; TAGC, exposure from Gtex and outcome from Trans-National Asthma Genetic Consortium (TAGC); F_T, meta-analysis of results from Gtex→Finngen and Gtex→TAGC; Finngen_2, exposure from eQTLGen and outcome from Finngen; TAGC, exposure from eQTLGen and outcome from TAGC; F_T_2, meta-analysis of results from eQTLGen→Finngen and eQTLGen→TAGC.