Journal Article

Enhanced meta-analysis and replication studies identify five new psoriasis susceptibility loci

Tejasvi, Trilokraj, Tsoi, Lam C., Enerback, Charlotta, Stuart, Philip E., Allen, Michael H., Krueger, Gerald G., Ellinghaus, Eva, Abecasis, Goncalo R., Das, Sayantan, Gladman, Dafna D., Stoll, Stefan W., Chandran, Vinod, Capon, Francesca, Weidinger, Stephan, Knight, Jo, Kang, Hyun M., Gudjonsson, Johann E., Lambert, Sylviane, Elder, James T., Nair, Rajan P., Barker, Jonathan N.W.N., Franke, Andre, Rahman, Proton, Rosen, Cheryl F., Weichenthal, Michael, Reis, Andre, Esko, Tonu, Koks, Sulev, Voorhees, John J., Kingo, Külli, Spain, Sarah L., Trembath, Richard C., Metspalu, Andres

2015

Overview

Psoriasis is a chronic autoimmune disease with complex genetic architecture. Previous genome-wide association studies (GWAS) and a recent meta-analysis using Immunochip data have uncovered 36 susceptibility loci. Here, we extend our previous meta-analysis of European ancestry by refined genotype calling and imputation and by the addition of 5,033 cases and 5,707 controls. The combined analysis, consisting of over 15,000 cases and 27,000 controls, identifies five new psoriasis susceptibility loci at genome-wide significance ( P <5 × 10 −8 ). The newly identified signals include two that reside in intergenic regions (1q31.1 and 5p13.1) and three residing near PLCL2 (3p24.3), NFKBIZ (3q12.3) and CAMK2G (10q22.2). We further demonstrate that NFKBIZ is a TRAF3IP2 -dependent target of IL-17 signalling in human skin keratinocytes, thereby functionally linking two strong candidate genes. These results further integrate the genetics and immunology of psoriasis, suggesting new avenues for functional analysis and improved therapies. About 2% of the population are affected by psoriasis, a chronic skin disease with complex genetics. Here Tsoi et al. conduct a meta-analysis of several genome-wide association studies and identify five novel loci, helping to further our understanding of the biology behind this condition.

• Publisher: Nature Publishing Group UK,Nature Publishing Group
• Subject: 631/208/205/2138 / 631/208/727/2000 / 692/699/249/1313/1758 / Adaptor Proteins, Signal Transducing / Genetic Loci / Genetic Predisposition to Disease / Genetics / Genome-Wide Association Study / Humanities and Social Sciences / Humans / I-kappa B Proteins - genetics / Immunology / Interleukin-17 - metabolism / Keratinocytes - metabolism / multidisciplinary / Nuclear Proteins - genetics / Psoriasis / Psoriasis - genetics / Reproducibility of Results / RNA, Messenger - genetics / RNA, Messenger - metabolism / Science / Science (multidisciplinary) / Skin diseases / Tumor Necrosis Factor Receptor-Associated Peptides and Proteins - metabolism