Abstract
Epidemiological studies suggest that cervical and trochanteric hip fractures have different pathogenesis. We tested the hypothesis that genetic factors have different influences on both types of fractures. Ten polymorphisms of genes known to play an important role in skeletal homeostasis [estrogen receptor alpha (ESR1), aromatase (CYP19A1), type I collagen (COL1A1), and lipoprotein receptor-related protein 5 (LRP5)] were analyzed in 471 Spanish patients with fragility hip fractures. Two polymorphisms of the LRP5 gene (rs7116604 and rs3781600) were associated with the type of fracture (P = 0.0085 and 0.0047, respectively). The presence of rare alleles at each locus was associated with trochanteric fractures over cervical fractures (OR = 1.7 in individuals with at least one rare allele at rs7116604 or rs3781600 loci in comparison with the common homozygotes). Considering individuals bearing the four common alleles as reference, the OR for trochanteric fractures was 1.6 in those with one or two rare alleles and 7.5 in those with three or four rare alleles (P for trend = 0.0074), which is consistent with an allele-dosage effect. There were no significant differences in the frequency distributions of the ESR1, CYP19A1, and COL1A1 genotypes between trochanteric and cervical fractures in either the original group or an extended group of 818 patients. These results suggest that LRP5 alleles influence the type of hip fractures. They support the view that different genetic factors are involved in cervical and trochanteric fractures, which should be taken into consideration in future genetic association studies.
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Acknowledgments
This work was supported in part by grants from Instituto de Salud Carlos III-Fondo de Investigaciones Sanitarias (PI06/0034, PS09/00539). We thank the staff at the Centro Nacional de Genotipado, particularly Maria Torres, for their help in genotyping. We also acknowledge the excellent technical assistance of Verónica Mijares and Jana Arozamena.
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Riancho, J., García-Ibarbia, C., Pérez-Núñez, M.I. et al. Genetic Polymorphisms of the Wnt Receptor LRP5 are Differentially Associated with Trochanteric and Cervical Hip Fractures. Calcif Tissue Int 90, 137–143 (2012). https://doi.org/10.1007/s00223-011-9557-2
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DOI: https://doi.org/10.1007/s00223-011-9557-2