Asthma is a common disease with a complex risk architecture including both genetic and environmental factors. We performed a meta-analysis of North American genome-wide association studies of asthma in 5,416 individuals with asthma (cases) including individuals of European American, African American or African Caribbean, and Latino ancestry, with replication in an additional 12,649 individuals from the same ethnic groups. We identified five susceptibility loci. Four were at previously reported loci on 17q21, near IL1RL1, TSLP and IL33, but we report for the first time, to our knowledge, that these loci are associated with asthma risk in three ethnic groups. In addition, we identified a new asthma susceptibility locus at PYHIN1, with the association being specific to individuals of African descent (P = 3.9 × 10−9). These results suggest that some asthma susceptibility loci are robust to differences in ancestry when sufficiently large samples sizes are investigated, and that ancestry-specific associations also contribute to the complex genetic architecture of asthma.
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This work was supported by grants from the Office of the Director, NIH to C.O. and D.L.N. and the National Heart, Lung, and Blood Institute (HL101651 to C.O. and D.L.N.; HL087665 to D.L.N.; HL070831, HL072414 and HL049596 to C.O.; HL064307 and HL064313 to F.D.M.; HL075419, HL65899, HL083069, HL066289, HL087680, HL101543 and HL101651 to S.T.W.; HL079055 to L.K.W.; HL087699, HL49612, HL075417, HL04266 and HL072433 to K.C.B.; HL061768 and HL076647 to F.D.G.; HL087680 to W.J.G.; HL078885 and HL088133 to E.G.B.; HL87665 to D.A.M.; and HL69116, HL69130, HL69149, HL69155, HL69167, HL69170, HL69174 and HL69349 to D.A.M., E.R.B., W.W.B., W.J.C., M.C., K.F.C., S.C.E., E.I. and S.E.W.), the National Institutes of Allergy and Infectious Disease (AI070503 to C.O.; AI079139 and AI061774 to L.K.W.; AI50024, AI44840 and AI41040 to K.C.B.; and AI077439 to E.G.B.), the National Institute of Diabetes and Digestive and Kidney Diseases to L.K.W. (DK064695); the National Institutes of Environmental Health Sciences (ES09606, ES018176 and ES015903 to K.C.B.; ES007048, ES009581, R826708, RD831861 and ES011627 to F.D.G.; ES015794 to E.G.B.; and the Division of Intramural Research, Z01 ES049019, to S.J.L.); the National Center for Research Resources (RR03048 to K.C.B.), the Environmental Protection Agency (83213901 and R-826724 to K.C.B.), the American Asthma Foundation and the Fund for Henry Ford Hospital (to L.K.W.), Mary Beryl Patch Turnbull Scholar Program (to K.C.B.), the National Council of Science and Technology (Mexico) (26206-M to I. Ruczinski), the Centers for Disease Control, US (to I. Ruczinski), the Eudowood Foundation (to N.N.H.); and the Flight Attendant Medical Research Institute (FAMRI), Robert Wood Johnson Foundation (RWJF) Amos Medical Faculty Development Award, the American Asthma Foundation, and the Sandler Foundation (to E.G.B.).
The authors gratefully acknowledge the contributions of H. Moreno-Macias, A. Barraza-Villarreal and M. Ramirez-Aguilar to the MCCAS; R. McConnell, D.C. Thomas, E. Avol, K. Berhane, J. Liu, E. Rappaport and C. Edlund to the CHS; L.N. Borrell, H. Farber, R. Kumar and D. Serebrisky to the GALA and GALA2 studies; S. Thyne to the GALA2 and SAGE studies; M. LeNoir, K. Meade and H. Geoff Watson to the SAGE study; and A.V. Grant, L. Gao, C. Vergara, Y.J. Tsai, P. Gao, M.C. Liu, P. Breysse, M.B. Bracken, J. Hoh, E.W. Pugh, A.F. Scott, G. Abecasis, T. Murray, T. Hand, M. Yang, M. Campbell, C. Foster, J.B. Hetmanski, R. Ashworth, C.M. Ongaco, K.N. Hetrick and K.F. Doheny to the GRAAD study. The authors also acknowledge the support from J. Kiley, S. Banks-Schlegel and W. Gan at the National Heart, Lung, and Blood Institute and all the subjects and families that participated in these studies.
Supplementary Figures 1–16, Supplementary Tables 1–8 and Supplementary Note.
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Current Allergy and Asthma Reports (2019)