PT  - JOURNAL ARTICLE
AU  - Nicholas Mancuso
AU  - Huwenbo Shi
AU  - Pagé Goddard
AU  - Gleb Kichaev
AU  - Alexander Gusev
AU  - Bogdan Pasaniuc
TI  - Integrating gene expression with summary association statistics to identify susceptibility genes for 30 complex traits
AID  - 10.1101/072967
DP  - 2016 Jan 01
TA  - bioRxiv
PG  - 072967
4099  - http://biorxiv.org/content/early/2016/09/01/072967.short
4100  - http://biorxiv.org/content/early/2016/09/01/072967.full
AB  - Although genome-wide association studies (GWASs) have identified thousands of risk loci for many complex traits and diseases, the causal variants and genes at these loci remain largely unknown. We leverage recently introduced methods to integrate gene expression measurements from 45 expression panels with summary GWAS data to perform 30 transcriptome-wide association studies (TWASs). We identify 1,196 susceptibility genes whose expression is associated with these traits; of these, 168 reside more than 0.5Mb away from any previously reported GWAS significant variant, thus providing new risk loci. Second, we find 43 pairs of traits with significant genetic correlation at the level of predicted expression; of these, 8 are not found through genetic correlation at the SNP level. Third, we use bi-directional regression to find evidence for BMI causally influencing triglyceride levels, and triglyceride levels causally influencing LDL. Taken together, our results provide insights into the role of expression to susceptibility of complex traits and diseases.