Characterization of genetic loci that affect susceptibility to inflammatory bowel diseases in African Americans.
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Huang Chengrui, Haritunians Talin, Okou David T, Cutler David J, Zwick Michael E, Taylor Kent D, Datta Lisa W, Maranville Joseph C, Liu Zhenqiu, Ellis Shannon, Chopra Pankaj, Alexander Jonathan S, Baldassano Robert N, Cross Raymond K, Dassopoulos Themistocles, Dhere Tanvi A, Duerr Richard H, Hanson John S, Hou Jason K, Hussain Sunny Z, Isaacs Kim L, Kachelries Kelly E, Kader Howard, Kappelman Michael D, Katz Jeffrey, Kellermayer Richard, Kirschner Barbara S, Kuemmerle John F, Kumar Archana, Kwon John H, Lazarev Mark, Mannon Peter, Moulton Dedrick E, Osuntokun Bankole O, Patel Ashish, Rioux John D, Rotter Jerome I, Saeed Shehzad, Scherl Ellen J, Silverberg Mark S, Silverman Ann, Targan Stephan R, Valentine John F, Wang Ming-Hsi, Simpson Claire L, Bridges S Louis, Kimberly Robert P, Rich Stephen S, Cho Judy H, Rienzo Anna Di, Kao Linda W H, McGovern Dermot P B, Brant Steven R, Kugathasan Subra
Аннотация
METHODS: We recruited AAs with IBD and without IBD (controls) from 34 IBD centers in the United States; additional controls were collected from 4 other Immunochip studies. Association and admixture loci were mapped for 1088 patients with Crohn's disease, 361 with ulcerative colitis, 62 with IBD type unknown, and 1797 controls; 130,241 autosomal single-nucleotide polymorphisms (SNPs) were analyzed.
RESULTS: The strongest associations were observed between ulcerative colitis and HLA rs9271366 (P = 7.5 × 10(-6)), Crohn's disease and 5p13.1 rs4286721 (P = 3.5 × 10(-6)), and IBD and KAT2A rs730086 (P = 2.3 × 10(-6)). Additional suggestive associations (P < 4.2 × 10(-5)) were observed between Crohn's disease and IBD and African-specific SNPs in STAT5A and STAT3; between IBD and SNPs in IL23R, IL12B, and C2orf43; and between ulcerative colitis and SNPs near HDAC11 and near LINC00994. The latter 3 loci have not been previously associated with IBD, but require replication. Established Caucasian associations were replicated in AAs (P < 3.1 × 10(-4)) at NOD2, IL23R, 5p15.3, and IKZF3. Significant admixture (P < 3.9 × 10(-4)) was observed for 17q12-17q21.31 (IZKF3 through STAT3), 10q11.23-10q21.2, 15q22.2-15q23, and 16p12.2-16p12.1. Network analyses showed significant enrichment (false discovery rate <1 × 10(-5)) in genes that encode members of the JAK-STAT, cytokine, and chemokine signaling pathways, as well those involved in pathogenesis of measles.
CONCLUSIONS: In a genetic analysis of 3308 AA IBD cases and controls, we found that many variants associated with IBD in Caucasians also showed association evidence with these diseases in AAs; we also found evidence for variants and loci not previously associated with IBD. The complex genetic factors that determine risk for or protection against IBD in different populations require further study.