Genome-wide association and functional studies identify a role for matrix Gla protein in osteoarthritis of the hand

Hollander, Wouter den and Boer, Cindy G. and Hart, Deborah J. and Yau, Michelle S. and Ramos, Yolande F.M. and Metrustry, Sarah and Broer, Linda and Deelen, Joris and Cupples, L. Adrienne and Rivadeneira, Fernando and Kloppenburg, Margreet and Peters, Marjolein and Spector, Tim D. and Hofman, Albert and Slagboom, P. Eline and Nelissen, Rob G.H.H. and Uitterlinden, André G. and Felson, David T. and Valdes, Ana M. and Meulenbelt, Ingrid and van Meurs, Joyce J.B. (2017) Genome-wide association and functional studies identify a role for matrix Gla protein in osteoarthritis of the hand. Annals of the Rheumatic Diseases . ISSN 1468-2060

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Abstract

Objective Osteoarthritis (OA) is the most common form of arthritis and the leading cause of disability in the elderly. Of all the joints, genetic predisposition is strongest for OA of the hand; however, only few genetic risk loci for hand OA have been identified. Our aim was to identify novel genes associated with hand OA and examine the underlying mechanism.

Methods We performed a genome-wide association study of a quantitative measure of hand OA in 12 784 individuals (discovery: 8743, replication: 4011). Genome-wide significant signals were followed up by analysing gene and allele-specific expression in a RNA sequencing dataset (n=96) of human articular cartilage.

Results We found two significantly associated loci in the discovery set: at chr12 (p=3.5 × 10⁻¹⁰) near the matrix Gla protein (MGP) gene and at chr12 (p=6.1×10⁻⁹) near the CCDC91 gene. The DNA variant near the MGP gene was validated in three additional studies, which resulted in a highly significant association between the MGP variant and hand OA (rs4764133, Betameta=0.83, Pmeta=1.8*10⁻¹⁵). This variant is high linkage disequilibrium with a coding variant in MGP, a vitamin K-dependent inhibitor of cartilage calcification. Using RNA sequencing data from human primary cartilage tissue (n=96), we observed that the MGP RNA expression of the hand OA risk allele was significantly lowercompared with the MGP RNA expression of the reference allele (40.7%, p<5*10⁻¹⁶).

Conclusions Our results indicate that the association between the MGP variant and increased risk for hand OA is caused by a lower expression of MGP, which may increase the burden of hand OA by decreased inhibition of cartilage calcification.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Medicine and Health Sciences > School of Medicine
Identification Number: 10.1136/annrheumdis-2017-211214
Depositing User: Eprints, Support
Date Deposited: 09 Nov 2017 08:58
Last Modified: 19 Nov 2017 21:55
URI: http://eprints.nottingham.ac.uk/id/eprint/48020

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