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Kerkhof, Hanneke J.M.; Lories, Rik J.; Meulenbelt, Ingrid; Jonsdottir, Ingileif; Valdes, Ana M; Arp, Pascal; Ingvarsson, Thorvaldur; Jhamai, Mila; Jonsson, Helgi; Stolk, Lisette; Thorleifsson, Gudmar; Zhai, Guangju; Zhang, Feng; Zhu, Yanyan; van der Breggen, Ruud; Carr, Andrew; Doherty, Michael; Doherty, Sally; Felson, David T.; Gonzalez, Antonio; Halldorsson, Bjarni V.; Hart, Deborah J.; Hauksson, Valdimar B.; Hofman, Albert; Ioannidis, John P.A.; Kloppenburg, Margreet; Lane, Nancy E.; Loughlin, John; Luyten, Frank P.; Nevitt, Michael C.; Parimi, Neeta; Pols, Huibert A.P.; van de Putte, Tom; Rivadeneira, Fernando; Slagboom, Eline P.; Styrkársdóttir, Unnur; Tsezou, Aspasia; Zmuda, Joseph; Spector, Tim D.; Stefansson, Kari; Uitterlinden, André G.; van Meurs, Joyce B.J.
Arthritis and rheumatism, 02/2010, Letnik: 62, Številka: 2Journal Article
To identify genes involved in osteoarthritis (OA), the most prevalent form of joint disease, we performed a genome-wide association study (GWAS) in which we tested 500,510 Single Nucelotide Polymorphisms (SNPs) in 1341 OA cases and 3496 Dutch Caucasian controls. SNPs associated with at least two OA-phenotypes were analysed in 14,938 OA cases and approximately 39,000 controls. The C-allele of rs3815148 on chromosome 7q22 (MAF 23%, 172 kb upstream of the GPR22 gene) was consistently associated with a 1.14-fold increased risk (95%CI: 1.09–1.19) for knee- and/or hand-OA (p=8×10 −8 ), and also with a 30% increased risk for knee-OA progression (95%CI: 1.03–1.64, p=0.03). This SNP is in almost complete linkage disequilibrium with rs3757713 (located 68 kb upstream of GPR22 ) which is associated with GPR22 expression levels in lymphoblast cell lines (p=4×10 −12 ). GPR22 encodes an G-protein coupled receptor with unkown ligand (orphan receptor). Immunohistochemistry experiments showed absence of GPR22 in normal mouse articular cartilage or synovium. However, GPR22 positive chondrocytes were found in the upper layers of the articular cartilage of mouse knee joints that were challenged by in vivo papain treatment or in the presence of interleukin-1 driven inflammation. GRP22 positive chondrocyte-like cells were also found in osteophytes in instability-induced OA. In addition, GPR22 is also present in areas of the brain involved in locomotor function. Our findings reveal a novel common variant on chromosome 7q22 to influence susceptibility for prevalence and progression of OA.
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