Abstract
Summary
Two missense polymorphisms of WNT16 were associated with hip bone mineral density (BMD), the buckling ratio of the femoral neck, calcaneal ultrasound and hip fractures in individuals under 80 years of age. These results confirm the association of the WNT16 gene with bone mass and osteoporotic fractures.
Introduction
Osteoporosis has a strong genetic component. Wnt ligands stimulate the differentiation of osteoblast precursors and play a major role in skeletal homeostasis. Therefore, the aim of this study was to explore the association of allelic variants of the WNT16 gene with BMD, other structural parameters of bone and osteoporotic hip fractures.
Methods
Six single nucleotide polymorphisms were analysed in 1,083 Caucasian individuals over 49 years of age.
Results
Two missense polymorphisms (rs2908004 and rs2707466) were associated with femoral neck BMD, with average differences across genotypes of 35 mg/cm2 (p = 0.00037 and 0.0015, respectively). Likewise, the polymorphisms were associated with calcaneal quantitative ultrasound parameters (p = 0.00004 and 0.0014, respectively) and the buckling ratio, an index of cortical instability of the femoral neck (p = 0.0007 and 0.0029, respectively). Although there were no significant differences in the genotype frequency distributions between 294 patients with hip fractures and 670 controls, among the subgroup under 80 years of age, TT genotypes were underrepresented in patients with fractures (odds ratio 0.50; CI 0.27–0.94).
Conclusion
Common missense polymorphisms of the WNT16 gene are associated with BMD at the hip, calcaneal ultrasound and the buckling ratio of the femoral neck, as well as with hip fractures in individuals under 80 years of age. Overall, these results confirm the association of the WNT16 locus with BMD identified in genome-wide association studies and support its role in determining the risk of osteoporotic fractures.
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Acknowledgments
This study was supported in part by grants from Instituto de Salud Carlos III-Fondo de Investigaciones Sanitarias (FIS PI 04/0028, 06/0034, 09/539 and 11/01092). We thank María Torres and Angel Carracedo (Centro Nacional de Genotipado) for genotyping the samples. We also thank Carolina Sañudo, Jana Arozamena and Verónica Mijares for their excellent technical work.
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García-Ibarbia, C., Pérez-Núñez, M.I., Olmos, J.M. et al. Missense polymorphisms of the WNT16 gene are associated with bone mass, hip geometry and fractures. Osteoporos Int 24, 2449–2454 (2013). https://doi.org/10.1007/s00198-013-2302-0
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DOI: https://doi.org/10.1007/s00198-013-2302-0