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Abstract

Psoriasis is a common immune-mediated disorder that affects the skin, nails and joints. To identify psoriasis susceptibility loci, we genotyped 438,670 SNPs in 1,409 psoriasis cases and 1,436 controls of European ancestry. We followed up 21 promising SNPs in 5,048 psoriasis cases and 5,041 controls. Our results provide strong support for the association of at least seven genetic loci and psoriasis (each with combined P < 5 × 10−8). Loci with confirmed association include HLA-C, three genes involved in IL-23 signaling (IL23A, IL23R, IL12B), two genes that act downstream of TNF-α and regulate NF-κB signaling (TNIP1, TNFAIP3) and two genes involved in the modulation of Th2 immune responses (IL4, IL13). Although the proteins encoded in these loci are known to interact biologically, we found no evidence for epistasis between associated SNPs. Our results expand the catalog of genetic loci implicated in psoriasis susceptibility and suggest priority targets for study in other auto-immune disorders.

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Acknowledgements

We gratefully acknowledge funding from the National Institutes of Health, the Foundation for NIH's Genetic Association Information Network and the National Psoriasis Foundation. Analysis and genotyping of follow-up samples was also supported by the German National Genome Research Network (BMFT 01GS 0171/BMBF NUW-S23T10) and POPGEN Biobank (BMBF 01GR0468), by the Canadian Institute of Health Research and the Arthritis Society of Canada, by the Centre National de Génotypage, Généthon and the Association Française contre les Myopathies (AFM), and by Celera Corporation.

Author information

Author notes

    • Rajan P Nair
    • , Kristina Callis Duffin
    • , Cynthia Helms
    •  & Jun Ding

    These authors contributed equally to this work.

    • James T Elder
    • , Gerald G Krueger
    • , Anne M Bowcock
    •  & Gonçalo R Abecasis

    These authors contributed equally to this work.

Affiliations

  1. Department of Dermatology, University of Michigan, Ann Arbor, Michigan 48109, USA.

    • Rajan P Nair
    • , Philip E Stuart
    • , Johann E Gudjonsson
    • , Trilokraj Tejasvi
    • , John J Voorhees
    • , James T Elder
    •  & Ravi Hiremagalore
  2. Department of Dermatology, University of Utah, Salt Lake City, Utah 84131, USA.

    • Kristina Callis Duffin
    • , David Goldgar
    • , Bing-Jian Feng
    •  & Gerald G Krueger
  3. Division of Human Genetics, Department of Genetics, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

    • Cynthia Helms
    • , Anne M Bowcock
    •  & Jennifer Gardner
  4. Center for Statistical Genetics, Department of Biostatistics, University of Michigan, Ann Arbor, Michigan 48109, USA.

    • Jun Ding
    • , Yun Li
    •  & Gonçalo R Abecasis
  5. Institute for Clinical Molecular Biology, University of Kiel, Kiel D-24105, Germany.

    • Andreas Ruether
    •  & Stefan Schreiber
  6. Department of Dermatology, University of Kiel, Kiel D-24105, Germany.

    • Michael Weichenthal
    • , Enno Christophers
    •  & Tilo Henseler
  7. Department of Rheumatology, University of Toronto, Toronto, Ontario M5T 2S8, Canada.

    • Dafna Gladman
  8. Department of Medicine, Memorial University, St. John's, Newfoundland A1C 5B8, Canada.

    • Proton Rahman
  9. Celera, 1401 Harbor Bay Parkway, Alameda, California 94502, USA.

    • Steven J Schrodi
    •  & Ann B Begovich
  10. Department of Pediatrics, University of Utah, Salt Lake City, Utah 84312, USA.

    • Sampath Prahalad
    •  & Stephen L Guthery
  11. Departments of Pediatrics and, Emory University School of Medicine, Atlanta, Georgia 30322, USA.

    • Sampath Prahalad
    • , Stephen L Guthery
    • , Judith Fischer
    •  & G Mark Lathrop
  12. Human Genetics, Emory University School of Medicine, Atlanta, Georgia 30322, USA.

    • Sampath Prahalad
    • , Stephen L Guthery
    • , Wilson Liao
    •  & Pui-Yan Kwok
  13. Centre National de Génotypage, Institut Génomique, Commissariat à l'Énergie Atomique, 91057 Evry Cedex, France.

    • Judith Fischer
    • , G Mark Lathrop
    •  & Alan Menter
  14. Department of Dermatology, University of California, San Francisco, California 94153, USA.

    • Wilson Liao
    • , Pui-Yan Kwok
    •  & C Wise
  15. Department of Dermatology, Baylor University Medical Center, Dallas, Texas 75246, USA.

    • Alan Menter
    •  & James T Elder
  16. Seay Center for Musculoskeletal Research, Texas Scottish Rite Hospital for Children, Dallas, Texas 75219, USA.

    • Carol A Wise
  17. Ann Arbor Veterans Affairs Hospital, Ann Arbor, Michigan 48105, USA.

    • James T Elder
  18. National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, Maryland 20894, USA.

    • Justin Paschall
  19. Cardiovascular Research Institute and Center for Human Genetics, University of California-San Francisco, California 94143, USA.

    • Mary J Malloy
    • , Clive R Pullinger
    •  & John P Kane
  20. Department of Psychiatry, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

    • Amy Perlmutter
    •  & Andrew Miner
  21. Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan 48109, USA.

    • Robert W Ike
  22. Department of Dermatology, Henry Ford Hospital, Detroit, Michigan 48202, USA.

    • Henry W Lim
  23. Institute for Clinical Molecular Biology, University of Kiel, Germany.

    • Stefan Schreiber
    •  & Andre Franke
  24. Department of General Medicine, University of Kiel, Germany.

    • Stefan Schreiber

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Contributions

J.T.E., G.G.K., A.M.B. and G.R.A. designed and directed the study. J.D., C.H., P.E.S., D. Goldgar, B.J.F., Y.L. and G.R.A. designed and carried out the main genome scan analysis. R.P.N., K.C.D., C.H., J.D., P.E.S., J.E.G., T.T., S.P., S.L.G., W.L., P.-Y.K., A.M., C.A.W., J.J.V., J.T.E, G.G.K. and A.M.B. provided samples for the initial genome-wide association scan and replication and executed the experiments. A.R., S.S., M.W., D. Gladman, P.R., S.J.S., J.F., G.M.L. and A.B.B. provided additional replication data. J.D., J.T.E. and G.R.A. generated the first draft of the paper. Additional major edits were done by K.C.D., P.E.S., A.B.B., G.G.K. and A.M.B. All authors reviewed and approved the paper.

Corresponding authors

Correspondence to James T Elder or Gerald G Krueger or Anne M Bowcock or Gonçalo R Abecasis.

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DOI

https://doi.org/10.1038/ng.311

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