Osteoporosis International

, Volume 21, Issue 1, pp 99–107

Association analyses of vitamin D-binding protein gene with compression strength index variation in Caucasian nuclear families

  • X.-H. Xu
  • D.-H. Xiong
  • X.-G. Liu
  • Y. Guo
  • Y. Chen
  • J. Zhao
  • R. R. Recker
  • H.-W. Deng
Original Article



This study was conducted to test whether there exists an association between vitamin D-binding protein (DBP) gene and compression strength index (CSI) phenotype. Candidate gene association analyses were conducted in total sample, male subgroup, and female subgroup, respectively. Two single-nucleotide polymorphisms (SNPs) with significant association results were found in males, suggesting the importance of DBP gene polymorphisms on the variation in CSI especially in Caucasian males.


CSI of the femoral neck (FN) is a newly developed phenotype integrating information about bone size, body size, and bone mineral density. It is considered to have the potential to improve the performance of risk assessment for hip fractures because it is based on a combination of phenotypic traits influencing hip fractures rather than a single trait. CSI is under moderate genetic determination (with a heritability of ∼44% found in this study), but the relevant genetic study is still rather scarce.


Based on the known physiological role of DBP in bone biology and the relatively high heritability of CSI, we tested 12 SNPs of the DBP gene for association with CSI variation in 405 Caucasian nuclear families comprising 1,873 subjects from the Midwestern US. Association analyses were performed in the total sample, male and female subgroups, respectively.


Significant associations with CSI were found with two SNPs (rs222029, P = 0.0019; rs222020, P = 0.0042) for the male subgroup. Haplotype-based association tests corroborated the single-SNP results.


Our findings suggest that the DBP gene might be one of the genetic factors influencing CSI phenotype in Caucasians, especially in males.


Association Compression strength index DBP Haplotype SNP 


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Copyright information

© International Osteoporosis Foundation and National Osteoporosis Foundation 2009

Authors and Affiliations

  • X.-H. Xu
    • 1
  • D.-H. Xiong
    • 2
  • X.-G. Liu
    • 1
  • Y. Guo
    • 1
  • Y. Chen
    • 1
  • J. Zhao
    • 1
  • R. R. Recker
    • 3
  • H.-W. Deng
    • 1
    • 2
    • 4
  1. 1.The Key Laboratory of Biomedical Information Engineering of Ministry of Education, Institute of Molecular Genetics, School of Life Science and TechnologyXi’an Jiaotong UniversityXi’anPeople’s Republic of China
  2. 2.Departments of Orthopedic Surgery and Basic Medical Sciences, School of MedicineUniversity of Missouri-Kansas CityKansas CityUSA
  3. 3.Osteoporosis Research Center and Department of Biomedical SciencesCreighton UniversityOmahaUSA
  4. 4.Laboratory of Molecular and Statistical Genetics, College of Life SciencesHunan Normal UniversityChangshaPeople’s Republic of China
  5. 5.Department of Basic Medical Science, School of MedicineUniversity of Missouri-Kansas CityKansas CityUSA

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