Genetic Contributions to Early and Late Onset Ischemic Stroke

Abstract Objective: To determine the contribution of common genetic variants to risk of early onset ischemic stroke (IS). Methods: We performed a meta-analysis of genome-wide association studies of early onset IS, ages 18-59, using individual level data or summary statistics in 16,927 cases and 576,353 non-stroke controls from 48 different studies across North America, Europe, and Asia. We further compared effect sizes at our most genome-wide significant loci between early and late onset IS and compared polygenic risk scores for venous thromboembolism between early versus later onset IS. Results: We observed an association between early onset IS and ABO, a known stroke locus. The effect size of the peak ABO SNP, rs8176685, was significantly larger in early compared to late onset IS (OR 1.17 (95% C.I.: 1.11-1.22) vs 1.05 (0.99-1.12); p for interaction = 0.008). Analysis of genetically determined ABO blood groups revealed that early onset IS cases were more likely to have blood group A and less likely to have blood group O compared to both non-stroke controls and to late onset IS cases. Using polygenic risk scores, we observed that greater genetic risk for venous thromboembolism, another prothrombotic condition, was more strongly associated with early, compared to late, onset IS (p=0.008). Conclusion: The ABO locus, genetically predicted blood group A, and higher genetic propensity for venous thrombosis are more strongly associated with early onset IS, compared with late onset IS, supporting a stronger role of prothrombotic factors in early onset IS.

C. Sudlow | J. Danesh | A. Peters | V. Salomaa | Y. Kamatani | R. Sacco | D. Duggan | K. Rexrode | C. Enzinger | P. Rothwell | F. de Leeuw | D. Trégouët | A. Havulinna | M. Hochberg | M. Dichgans | P. Amouyel | S. Kittner | J. Veldink | M. Müller-Nurasyid | V. Abedi | M. Kubo | R. Schmidt | Jennifer A. Smith | J. Attia | J. Faul | E. Holliday | D. Weir | S. Kardia | Julie A. Johnson | A. Lindgren | P. McArdle | B. Mitchell | H. Markus | T. O’Connor | Zhengming Chen | Liming Li | C. Sánchez-Mora | M. Ribasés | J. Maguire | C. Terao | A. Butterworth | G. Paré | T. Rundek | Christopher Levi | D. Woo | S. Debette | M. Cushman | J. Perry | V. Thijs | M. O’Donnell | T. Tatlisumak | K. Ryan | O. Benavente | J. Rosand | A. Giese | L. Heitsch | A. Słowik | D. Strbian | Jin-Moo Lee | J. Putaala | I. Férnandez-Cadenas | A. Tuladhar | C. Jern | S. Wassertheil-Smoller | M. Irvin | T. Jaworek | U. Grittner | R. Malik | Huichun Xu | S. Bell | J. Meschia | D. Ray | Pankaj Sharma | R. Grewal | C. McDonough | O. Ross | R. Zand | B. Worrall | R. Walters | J. P. Durda | Kuang Lin | G. Boncoraglio | M. Chong | R. Lemmens | J. Cole | C. Anderson | K. Rannikmäe | A. Ilinca | Jiang Li | J. Pera | T. Stanne | T. Metso | M. Koido | N. Smith | L. Lange | G. Engstrom | C. Geiger | B. Gaynor | N. Torres-Aguila | J. Cárcel-Márquez | Sothear H. Luke | Raquel Rabionet Janssen | L. Tomppo | N. Armstrong | C. Cruchaga | Jieping Hu | C. C. Hong | L. R. Peddareddygari | Haley Lopez | Natalie Fecteau | Mina A. Jacob | J. Jiménez-Conde | O. Stine | C. Levi | Debashree Ray | R. Jackson | Martin Soderholm | M. A. Jacob | M. Jacob | M. Kubo | S. Kardia | Masaru Koido | M. Soderholm | Kristiina Rannikmäe | A. Peters | R. Schmidt | Jennifer A. Smith

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