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A combined large-scale meta-analysis identifies COG6 as a novel shared risk locus for rheumatoid arthritis and systemic lupus erythematosus
  1. Ana Márquez1,2,
  2. Laura Vidal-Bralo3,
  3. Luis Rodríguez-Rodríguez4,
  4. Miguel A González-Gay5,
  5. Alejandro Balsa6,
  6. Isidoro González-Álvaro7,
  7. Patricia Carreira8,
  8. Norberto Ortego-Centeno2,
  9. María M Ayala-Gutiérrez9,
  10. Francisco José García-Hernández10,
  11. M Francisca González-Escribano11,
  12. José Mario Sabio12,
  13. Carles Tolosa13,
  14. Ana Suárez14,
  15. Antonio González3,
  16. Leonid Padyukov15,
  17. Jane Worthington16,
  18. Timothy Vyse17,18,
  19. Marta E Alarcón-Riquelme19,20,
  20. Javier Martín1
  1. 1Instituto de Parasitología y Biomedicina “López-Neyra”, CSIC, PTS Granada, Granada, Spain
  2. 2Systemic Autoimmune Diseases Unit, Hospital Clínico San Cecilio, Granada, Spain
  3. 3Laboratorio de Investigación 10 and Rheumatology Unit, Instituto de Investigación Sanitaria—Hospital Clinico Universitario de Santiago, Santiago de Compostela, Spain
  4. 4Rheumatology Department and Heath Research Institute (IdISSC), Hospital Clinico San Carlos, Madrid, Spain
  5. 5Department of Rheumatology, Hospital Universitario Marqués de Valdecilla, IDIVAL, Santander, Spain
  6. 6Department of Rheumatology and Institute for Health Research (IdiPAZ), University Hospital La Paz, Madrid, Spain
  7. 7Rheumatology Service and Health Research Institute (IP), Hospital Universitario de La Princesa, Madrid, Spain
  8. 8Rheumatology Department, Hospital 12 de Octubre, Madrid, Spain
  9. 9Department of Internal Medicine, Hospital Carlos Haya, Málaga, Spain
  10. 10Department of Internal Medicine, Hospital Universitario Virgen del Rocío, Sevilla, Spain
  11. 11Department of Immunology, Hospital Universitario Virgen del Rocío (IBiS, CSIC, US), Sevilla, Spain
  12. 12Department of Internal Medicine, Hospital Virgen de las Nieves, Granada, Spain
  13. 13Department of Internal Medicine, Hospital Parc Taulí, Sabadell, Spain
  14. 14Department of Functional Biology, Immunology Area, Faculty of Medicine, University of Oviedo, Oviedo, Spain
  15. 15Rheumatology Unit, Department of Medicine, Karolinska Institutet, Stockholm, Sweden
  16. 16Arthritis Research UK Centre for Genetics and Genomics, Centre for Musculoskeletal Research, Institute of Inflammation and Repair, Manchester Academic Health Science Centre, The University of Manchester, Manchester, UK
  17. 17Division of Genetics and Molecular Medicine, King's College London, London, UK
  18. 18Division of Immunology, Infection and Inflammatory Disease, King's College London, London, UK
  19. 19Centro de Genómica e Investigación Oncológica (GENYO), Pfizer-Universidad de Granada-Junta de Andalucía, Granada, Spain
  20. 20Institute for Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
  1. Correspondence to Dr Ana Márquez, Instituto de Parasitología y Biomedicina López-Neyra, Consejo Superior de Investigaciones Científicas, Parque Tecnológico Ciencias de la Salud, Avenida del Conocimiento s/n Armilla, Granada 18016, Spain; anamaort{at}ipb.csic.es

Abstract

Objectives During the last years, genome-wide association studies (GWASs) have identified a number of common genetic risk factors for rheumatoid arthritis (RA) and systemic lupus erythematosus (SLE). However, the genetic overlap between these two immune-mediated diseases has not been thoroughly examined so far. The aim of the present study was to identify additional risk loci shared between RA and SLE.

Methods We performed a large-scale meta-analysis of GWAS data from RA (3911 cases and 4083 controls) and SLE (2237 cases and 6315 controls). The top-associated polymorphisms in the discovery phase were selected for replication in additional datasets comprising 13 641 RA cases and 31 921 controls and 1957 patients with SLE and 4588 controls.

Results The rs9603612 genetic variant, located nearby the COG6 gene, an established susceptibility locus for RA, reached genome-wide significance in the combined analysis including both discovery and replication sets (p value=2.95E−13). In silico expression quantitative trait locus analysis revealed that the associated polymorphism acts as a regulatory variant influencing COG6 expression. Moreover, protein–protein interaction and gene ontology enrichment analyses suggested the existence of overlap with specific biological processes, specially the type I interferon signalling pathway. Finally, genetic correlation and polygenic risk score analyses showed cross-phenotype associations between RA and SLE.

Conclusions In conclusion, we have identified a new risk locus shared between RA and SLE through a meta-analysis including GWAS datasets of both diseases. This study represents the first comprehensive large-scale analysis on the genetic overlap between these two complex disorders.

  • Rheumatoid Arthritis
  • Systemic Lupus Erythematosus
  • Gene Polymorphism

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