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A rare variant in the osteoarthritis-associated locus GDF5 is functional and reveals a site that can be manipulated to modulate GDF5 expression

Lookup NU author(s): Andrew Dodd, Catherine Syddall, Professor John Loughlin

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Abstract

Osteoarthritis (OA) is a polygenic disease characterized by cartilage loss, with the single-nucleotide polymorphism (SNP) rs143383 (C/T) influencing OA susceptibility across a range of ethnic groups. The SNP resides within the 5′-UTR of the growth and differentiation factor 5 gene (GDF5), with the OA-associated T-allele mediating reduced GDF5 expression. As GDF5 codes for a cartilage anabolic protein, this reduced expression may explain why the T-allele of rs143383 is an OA risk factor. Our deep sequencing of GDF5 identified a C/A transversion located −41 bp relative to the gene’s transcription start site. This promoter variant is predicted to affect transcription factor binding and it may therefore highlight a regulatory site that could be exploited to manipulate GDF5 expression and alleviate the detrimental effect mediated by the T-allele of rs143383. Here, we describe our functional assessment of the −41 bp variant. Using reporter constructs we demonstrated that the transversion leads to increased gene expression to such a degree that the A-allele is able to compensate for the reduced expression mediated by the T-allele of rs143383. Using electrophoretic mobility shift assays we identified YY1 as a trans-acting factor that differentially binds to the alleles of the −41 bp variant, with more avid binding to allele A. Knockdown of YY1 led to a significant reduction in GDF5 expression, supporting YY1 as a GDF5 activator. In conclusion, we demonstrated that the −41 bp variant is functional and we have identified a regulatory region of GDF5 that can be exploited to overcome the OA genetic deficit mediated by the T-allele of rs143383.


Publication metadata

Author(s): Dodd AW, Syddall CM, Loughlin J

Publication type: Article

Publication status: Published

Journal: European Journal of Human Genetics

Year: 2013

Volume: 21

Issue: 5

Pages: 517-521

Print publication date: 29/08/2012

Date deposited: 02/05/2013

ISSN (print): 1018-4813

ISSN (electronic): 1476-5438

Publisher: Nature Publishing Group

URL: http://dx.doi.org/10.1038/ejhg.2012.197

DOI: 10.1038/ejhg.2012.197


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