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Are vitamin D receptor polymorphisms associated with bone mineral density? A meta-analysis
1Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA.
Summary
Vitamin D receptor (VDR) gene variations are linked to bone mineral density (BMD). This meta-analysis confirms VDR polymorphisms affect BMD, particularly at the hip and spine, with variations influenced by age.
Area of Science:
- Genetics and Bone Metabolism
- Molecular Endocrinology
Background:
- Vitamin D receptor (VDR) gene polymorphisms have shown inconsistent associations with bone mineral density (BMD) in previous studies.
- Understanding the genetic factors influencing BMD is crucial for skeletal health research.
Purpose of the Study:
- To quantitatively assess the association between VDR polymorphisms and BMD using a meta-analytic approach.
- To investigate how study characteristics, such as skeletal site and subject demographics, impact the VDR-BMD relationship.
Main Methods:
- A meta-analysis was conducted on 16 peer-reviewed studies published up to July 1996.
- Bone mineral density (BMD) was compared between homozygous genotypes (BB vs. bb) for VDR polymorphisms.
- Calculations included mean difference, percent difference, and effect size, with subgroup analyses for skeletal site and age.
Main Results:
- A significant association was found between VDR polymorphisms and lower BMD at the hip (p=0.032) and a trend at the spine (p=0.062) and distal radius (p=0.078).
- The BB genotype was associated with reduced BMD compared to the bb genotype across skeletal sites.
- The effect of VDR on hip BMD was more pronounced in younger women, suggesting an age-related interaction, though statistical evidence was weak (p=0.06).
Conclusions:
- Vitamin D receptor (VDR) polymorphisms are a significant genetic factor influencing bone mineral density (BMD).
- The VDR-BMD association may be modulated by age, particularly at the hip.
- Further research is needed to elucidate the mechanisms, clinical significance, and interplay of VDR with other genetic and environmental factors in bone health.