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Osteoarthritis (OA) is the most common form of arthritis with a clear genetic component. To identify novel loci associated with hip OA we performed a meta-analysis of genome-wide association studies (GWAS) on European subjects.We performed a two-stage meta-analysis on more than 78,000 participants. In stage 1, we synthesised data from eight GWAS whereas data from 10 centres were used for 'in silico' or 'de novo' replication. Besides the main analysis, a stratified by sex analysis was performed to detect possible sex-specific signals. Meta-analysis was performed using inverse-variance fixed effects models. A random effects approach was also used.We accumulated 11,277 cases of radiographic and symptomatic hip OA. We prioritised eight single nucleotide polymorphism (SNPs) for follow-up in the discovery stage (4349 OA cases); five from the combined analysis, two male specific and one female specific. One locus, at 20q13, represented by rs6094710 (minor allele frequency (MAF) 4%) near the NCOA3 (nuclear receptor coactivator 3) gene, reached genome-wide significance level with p=7.9×10(-9) and OR=1.28 (95% CI 1.18 to 1.39) in the combined analysis of discovery (p=5.6×10(-8)) and follow-up studies (p=7.3×10(-4)). We showed that this gene is expressed in articular cartilage and its expression was significantly reduced in OA-affected cartilage. Moreover, two loci remained suggestive associated; rs5009270 at 7q31 (MAF 30%, p=9.9×10(-7), OR=1.10) and rs3757837 at 7p13 (MAF 6%, p=2.2×10(-6), OR=1.27 in male specific analysis).Novel genetic loci for hip OA were found in this meta-analysis of GWAS.

Original publication

DOI

10.1136/annrheumdis-2012-203114

Type

Journal article

Journal

Annals of the rheumatic diseases

Publication Date

12/2014

Volume

73

Pages

2130 - 2136

Addresses

Department of Hygiene and Epidemiology, University of Ioannina Medical School, Ioannina, Greece Department of Twin Research & Genetic Epidemiology, King's College London, London, UK.

Keywords

arcOGEN Consortium, Humans, Osteoarthritis, Hip, Genetic Predisposition to Disease, Protein-Serine-Threonine Kinases, Homeodomain Proteins, Immediate-Early Proteins, HMGN Proteins, Sex Factors, Gene Frequency, Polymorphism, Single Nucleotide, European Continental Ancestry Group, Female, Male, Protein-Tyrosine Kinases, Calcium-Calmodulin-Dependent Protein Kinase Type 2, Genome-Wide Association Study, Nuclear Receptor Coactivator 3