Background: Deficient levels of 25-hydroxyvitamin D [25(OH)D] have been associated with increased fracture risk. Racial differences in fracture risk may be related to differences in bioavailable vitamin D due to single nucleotide polymorphism (SNP) variations in the vitamin D binding protein (DBP). Methods: We measured 25(OH)D levels in 12,781 middle-aged White and Black participants [mean age 57. years (SD 5.7), 25% Black] in the ARIC Study who attended the second examination from 1990-1992. Participants were genotyped for two DBP SNPs (rs4588 and rs7041). Incident hospitalized fractures were measured by abstracting hospital records for ICD-9 codes. We used Cox proportional hazards models to evaluate the association between 25(OH)D levels and risk of fracture with adjustment for possible confounders. Interactions were tested by race and DBP genotype. Results: There were 1122 incident fracture-related hospitalizations including 267 hip fractures over a median of 19.6. years of follow-up. Participants with deficient 25(OH)D (<. 20. ng/mL) had a higher risk of any fracture hospitalization [HR = 1.21 (95% CI 1.05-1.39)] and hospitalization for hip fracture [HR = 1.35 (1.02-1.79)]. No significant racial interaction was noted (p-interaction = 0.20 for any fracture; 0.74 for hip fracture). There was no independent association of rs4588 and rs7041 with fracture. However, there was a marginal interaction for 25(OH)D deficiency with rs7041 among Whites (p-interaction = 0.065). Whites with both 25(OH)D deficiency and the GG genotype [i.e. with predicted higher levels of DBP and lower bioavailable vitamin D] were at the greatest risk for any fracture [HR = 1.48 (1.10-2.00)] compared to Whites with the TT genotype and replete 25(OH)D (reference group). Conclusions: Deficient 25(OH)D levels are associated with higher incidence of hospitalized fractures. Marginal effects were seen in Whites for the DBP genotype associated with lower bioavailable vitamin D, but result inconclusive. Further investigation is needed to more directly evaluate the association between bioavailable vitamin D and fracture risk.
|Original language||English (US)|
|Number of pages||8|
|State||Published - Sep 1 2015|
Bibliographical noteFunding Information:
Dr. Michos was supported by NIH /NINDS grant R01NS072243 . This research was also supported by grants from the NIH/NHLBI ( R01HL103706 to Dr. Lutsey), the NIH Office of Dietary Supplements ( R01HL103706-S1 to Dr. Lutsey) and the NIH/NIDDK ( R01DK089174 to Dr. Selvin). Genotyping was supported through the NHLBI CARe (Candidate Gene Resource) grant N01HC65226 . Dr. Schneider was supported by NIH/NHLBI training grant T32HL007024 . The Atherosclerosis Risk in Communities Study is carried out as a collaborative study supported by National Heart, Lung, and Blood Institute contracts ( HHSN268201100005C , HHSN268201100006C , HHSN268201100007C , HHSN268201100008C , HHSN268201100009C , HHSN268201100010C , HHSN268201100011C , and HHSN268201100012C ).
© 2015 Elsevier Inc.
- Vitamin D
- Vitamin D binding protein polymorphisms