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Brant SR, Okou DT, Simpson CL, Cutler DJ, Haritunians T, Bradfield JP, Chopra P, Prince J, Begum F, Kumar A, Huang C, Venkateswaran S, Datta LW, Wei Z, Thomas K, Herrinton LJ, Klapproth JMA, Quiros AJ, Seminerio J, Liu Z, Alexander JS, Baldassano RN, Dudley-Brown S, Cross RK, Dassopoulos T, Denson LA, Dhere TA, Dryden GW, Hanson JS, Hou JK, Hussain SZ, Hyams JS, Isaacs KL, Kader H, Kappelman MD, Katz J, Kellermayer R, Kirschner BS, Kuemmerle JF, Kwon JH, Lazarev M, Li E, Mack D, Mannon P, Moulton DE, Newberry RD, Osuntokun BO, Patel AS, Saeed SA, Targan SR, Valentine JF, Wang MH, Zonca M, Rioux JD, Duerr RH, Silverberg MS, Cho JH, Hakonarson H, Zwick ME, McGovern DP, Kugathasan S. Genome-Wide Association Study Identifies African-Specific Susceptibility Loci in African Americans With Inflammatory Bowel Disease. Gastroenterology 2017; 152:206-217.e2. [PMID: 27693347 PMCID: PMC5164948 DOI: 10.1053/j.gastro.2016.09.032] [Citation(s) in RCA: 104] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 09/14/2016] [Accepted: 09/17/2016] [Indexed: 01/03/2023]
Abstract
BACKGROUND & AIMS The inflammatory bowel diseases (IBD) ulcerative colitis (UC) and Crohn's disease (CD) cause significant morbidity and are increasing in prevalence among all populations, including African Americans. More than 200 susceptibility loci have been identified in populations of predominantly European ancestry, but few loci have been associated with IBD in other ethnicities. METHODS We performed 2 high-density, genome-wide scans comprising 2345 cases of African Americans with IBD (1646 with CD, 583 with UC, and 116 inflammatory bowel disease unclassified) and 5002 individuals without IBD (controls, identified from the Health Retirement Study and Kaiser Permanente database). Single-nucleotide polymorphisms (SNPs) associated at P < 5.0 × 10-8 in meta-analysis with a nominal evidence (P < .05) in each scan were considered to have genome-wide significance. RESULTS We detected SNPs at HLA-DRB1, and African-specific SNPs at ZNF649 and LSAMP, with associations of genome-wide significance for UC. We detected SNPs at USP25 with associations of genome-wide significance for IBD. No associations of genome-wide significance were detected for CD. In addition, 9 genes previously associated with IBD contained SNPs with significant evidence for replication (P < 1.6 × 10-6): ADCY3, CXCR6, HLA-DRB1 to HLA-DQA1 (genome-wide significance on conditioning), IL12B,PTGER4, and TNC for IBD; IL23R, PTGER4, and SNX20 (in strong linkage disequilibrium with NOD2) for CD; and KCNQ2 (near TNFRSF6B) for UC. Several of these genes, such as TNC (near TNFSF15), CXCR6, and genes associated with IBD at the HLA locus, contained SNPs with unique association patterns with African-specific alleles. CONCLUSIONS We performed a genome-wide association study of African Americans with IBD and identified loci associated with UC in only this population; we also replicated IBD, CD, and UC loci identified in European populations. The detection of variants associated with IBD risk in only people of African descent demonstrates the importance of studying the genetics of IBD and other complex diseases in populations beyond those of European ancestry.
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Affiliation(s)
- Steven R. Brant
- Department of Medicine, Meyerhoff Inflammatory Bowel Disease Center, Johns
Hopkins University School of Medicine, Baltimore, MD, 21231, USA,Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health,
Baltimore, MD, 21205, USA
| | - David T. Okou
- Department of Pediatrics, Emory University School of Medicine, Atlanta, GA,
30322, USA
| | - Claire L. Simpson
- Department of Genetics, Genomics and Informatics, University of Tennessee
Health Science Center, Memphis, TN, 38163, USA,Computational and Statistical Genomics Branch, National Human Genome
Research Institute, National Institutes of Health, Baltimore, MD 21224, USA
| | - David J. Cutler
- Department of Human Genetics, Emory University School of Medicine, Atlanta,
GA, 30322, USA
| | - Talin Haritunians
- F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research
Institute, Cedars-Sinai Medical Center, Los Angeles, CA, 90048, USA
| | - Jonathan P. Bradfield
- Center for Applied Genomics, Abramson Research Center, The Children's
Hospital of Philadelphia, Philadelphia, PA, 19104, USA
| | - Pankaj Chopra
- Department of Human Genetics, Emory University School of Medicine, Atlanta,
GA, 30322, USA
| | - Jarod Prince
- Department of Pediatrics, Emory University School of Medicine, Atlanta, GA,
30322, USA
| | - Ferdouse Begum
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health,
Baltimore, MD, 21205, USA
| | - Archana Kumar
- Department of Pediatrics, Emory University School of Medicine, Atlanta, GA,
30322, USA
| | - Chengrui Huang
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health,
Baltimore, MD, 21205, USA
| | - Suresh Venkateswaran
- Department of Pediatrics, Emory University School of Medicine, Atlanta, GA,
30322, USA
| | - Lisa W. Datta
- Department of Medicine, Meyerhoff Inflammatory Bowel Disease Center, Johns
Hopkins University School of Medicine, Baltimore, MD, 21231, USA
| | - Zhi Wei
- Center for Applied Genomics, Abramson Research Center, The Children's
Hospital of Philadelphia, Philadelphia, PA, 19104, USA
| | - Kelly Thomas
- Center for Applied Genomics, Abramson Research Center, The Children's
Hospital of Philadelphia, Philadelphia, PA, 19104, USA
| | | | | | - Antonio J. Quiros
- Department of Pediatrics, MUSC Pediatric Center for Inflammatory Bowel
Disorders, Summerville, SC, 29485, USA
| | - Jenifer Seminerio
- Department of Gastroenterology, MUSC Digestive Disease Center, Charleston,
SC, 29486, USA
| | - Zhenqiu Liu
- F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research
Institute, Cedars-Sinai Medical Center, Los Angeles, CA, 90048, USA
| | - Jonathan S. Alexander
- Department of Molecular and Cellular Physiology, Louisiana State University
Health Sciences Center, Shreveport, LA, 71130, USA
| | - Robert N. Baldassano
- Department of Pediatrics, Children's Hospital of Philadelphia,
Philadelphia, PA, 19104, USA
| | - Sharon Dudley-Brown
- Department of Medicine, Johns Hopkins University Schools of Medicine &
Nursing, Baltimore, MD, 21287, USA
| | - Raymond K. Cross
- Department of Medicine, University of Maryland School of Medicine,
Baltimore, MD, 21201, USA
| | | | - Lee A. Denson
- Division of Gastroenterology, Hepatology and Nutrition, Cincinnati
Children's Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - Tanvi A. Dhere
- Department of Medicine, Emory University School of Medicine, Atlanta, GA,
30322, USA
| | - Gerald W. Dryden
- Department of Medicine, University of Louisville, Louisville, KY, 40202,
USA
| | - John S. Hanson
- Charlotte Gastroenterology and Hepatology, Charlotte, NC, 28207, USA
| | - Jason K. Hou
- Department of Medicine, Baylor College of Medicine; VA HSR&D Center for
Innovations in Quality Effectiveness and Safety; Michael E. DeBakey VA Medical Center,
Houston, TX, 77030, USA
| | - Sunny Z. Hussain
- Department of Pediatrics, Willis-Knighton Physician Network, Shreveport,
LA, 71118, USA
| | | | - Kim L. Isaacs
- Department of Medicine, University of North Carolina at Chapel Hill, Chapel
Hill, NC, 27514, USA
| | - Howard Kader
- Department of Pediatrics, University of Maryland School of Medicine,
Baltimore, MD, 21201, USA
| | - Michael D. Kappelman
- Department of Pediatrics, University of North Carolina at Chapel Hill,
Chapel Hill, NC, 27514, USA
| | - Jeffry Katz
- Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Richard Kellermayer
- Section of Pediatric Gastroenterology, Baylor College of Medicine, Texas
Children's Hospital, Houston, TX, 77030, USA
| | - Barbara S. Kirschner
- Department of Pediatrics, University of Chicago Comer Children's
Hospital, Chicago, IL, 60637, USA
| | - John F. Kuemmerle
- Medicine and Physiology and Biophysics, Medical College of Virginia Campus
of Virginia Commonwealth University, Richmond, VA, 23298, USA
| | - John H. Kwon
- Department of Internal Medicine, University of Texas Southwestern Medical
Center, Dallas, TX, 75390, USA
| | - Mark Lazarev
- Department of Medicine, Johns Hopkins University School of Medicine,
Baltimore, MD, 21205, USA
| | - Ellen Li
- Department of Medicine, Stony Brook University School of Medicine, Stony
Brook, NY, 11794, USA
| | - David Mack
- Department of Pediatrics, University of Ottawa and Children’s
Hospital of Eastern Ontario, Ottawa, Ontario, K1H 8L1, Canada
| | - Peter Mannon
- Department of Medicine, University of Alabama at Birmingham, Birmingham,
AL, 35294, USA
| | | | - Rodney D. Newberry
- Department of Internal Medicine, Washington University School of Medicine,
St. Louis, MO, 63110, USA
| | - Bankole O. Osuntokun
- Department of Pediatrics, Cook Children's Medical Center, Fort Worth,
TX, 76104, USA
| | - Ashish S. Patel
- Department of Pediatrics, University of Texas Southwestern Medical Center,
Dallas, TX, 75390, USA
| | - Shehzad A. Saeed
- Division of Gastroenterology, Hepatology and Nutrition, Cincinnati
Children's Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - Stephan R. Targan
- F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research
Institute, Cedars-Sinai Medical Center, Los Angeles, CA, 90048, USA
| | | | - Ming-Hsi Wang
- Division of Gastroenterology and Hepatology, Mayo Clinic Florida,
Jacksonville, FL, 32224, USA
| | - Martin Zonca
- Department of Internal Medicine, Henry Ford Health System, Detroit, MI,
48202, USA
| | - John D. Rioux
- Department of Medicine, Université de Montréal and the
Montreal Heart Institute Research Center, Montreal, Quebec, H1T 1C8, Canada
| | - Richard H. Duerr
- Department of Medicine and Clinical and Translational Science Institute,
School of Medicine; and Department of Human Genetics, Graduate School of Public Health;
University of Pittsburgh, Pittsburgh, PA, 15261, USA
| | - Mark S. Silverberg
- Department of Medicine, Zane Cohen Centre for Digestive Diseases, Mount
Sinai Hospital, University of Toronto, Toronto, Toronto, Ontario, M5G1X5, Canada
| | - Judy H. Cho
- Medicine and Genetics, Icahn School of Medicine at Mount Sinai, Charles
Bronfman Institute for Personalized Medicine, New York, NY, 10029, USA
| | - Hakon Hakonarson
- Center for Applied Genomics, Abramson Research Center, The Children's
Hospital of Philadelphia, Philadelphia, PA, 19104, USA
| | - Michael E. Zwick
- Department of Human Genetics, Emory University School of Medicine, Atlanta,
GA, 30322, USA
| | - Dermot P.B. McGovern
- F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research
Institute, Cedars-Sinai Medical Center, Los Angeles, CA, 90048, USA
| | - Subra Kugathasan
- Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia; Department of Human Genetics, Emory University School of Medicine, Atlanta, Georgia.
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