TY - JOUR T1 - A genome-wide association study identifies new loci for factor VII and implicates factor VII in ischemic stroke etiology. JF - Blood Y1 - 2019 A1 - de Vries, Paul S A1 - Sabater-Lleal, Maria A1 - Huffman, Jennifer E A1 - Marten, Jonathan A1 - Song, Ci A1 - Pankratz, Nathan A1 - Bartz, Traci M A1 - de Haan, Hugoline G A1 - Delgado, Graciela E A1 - Eicher, John D A1 - Martinez-Perez, Angel A1 - Ward-Caviness, Cavin K A1 - Brody, Jennifer A A1 - Chen, Ming-Huei A1 - de Maat, Moniek P M A1 - Frånberg, Mattias A1 - Gill, Dipender A1 - Kleber, Marcus E A1 - Rivadeneira, Fernando A1 - Soria, José Manuel A1 - Tang, Weihong A1 - Tofler, Geoffrey H A1 - Uitterlinden, André G A1 - van Hylckama Vlieg, Astrid A1 - Seshadri, Sudha A1 - Boerwinkle, Eric A1 - Davies, Neil M A1 - Giese, Anne-Katrin A1 - Ikram, M Kamran A1 - Kittner, Steven J A1 - McKnight, Barbara A1 - Psaty, Bruce M A1 - Reiner, Alex P A1 - Sargurupremraj, Muralidharan A1 - Taylor, Kent D A1 - Fornage, Myriam A1 - Hamsten, Anders A1 - März, Winfried A1 - Rosendaal, Frits R A1 - Souto, Juan Carlos A1 - Dehghan, Abbas A1 - Johnson, Andrew D A1 - Morrison, Alanna C A1 - O'Donnell, Christopher J A1 - Smith, Nicholas L AB -

Factor VII (FVII) is an important component of the coagulation cascade. Few genetic loci regulating FVII activity and/or levels have been discovered to date. We conducted a meta-analysis of 9 genome-wide association studies of plasma FVII levels (7 FVII activity and 2 FVII antigen) among 27 495 participants of European and African ancestry. Each study performed ancestry-specific association analyses. Inverse variance weighted meta-analysis was performed within each ancestry group and then combined for a -ancestry meta-analysis. Our primary analysis included the 7 studies that measured FVII activity, and a secondary analysis included all 9 studies. We provided functional genomic validation for newly identified significant loci by silencing candidate genes in a human liver cell line (HuH7) using small-interfering RNA and then measuring messenger RNA and FVII protein expression. Lastly, we used meta-analysis results to perform Mendelian randomization analysis to estimate the causal effect of FVII activity on coronary artery disease, ischemic stroke (IS), and venous thromboembolism. We identified 2 novel ( and ) and 6 known loci associated with FVII activity, explaining 19.0% of the phenotypic variance. Adding FVII antigen data to the meta-analysis did not result in the discovery of further loci. Silencing in HuH7 cells upregulated FVII, whereas silencing downregulated FVII. Mendelian randomization analyses suggest that FVII activity has a positive causal effect on the risk of IS. Variants at and contribute to FVII activity by regulating expression levels. FVII activity appears to contribute to the etiology of IS in the general population.

VL - 133 IS - 9 ER -