Genetic factors associated with absolute and relative plasma concentrations of calcitriol.
Cancer Epidemiol Biomarkers Prev 2023;
32:697-707. [PMID:
36788426 DOI:
10.1158/1055-9965.epi-22-0797]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 10/27/2022] [Accepted: 02/10/2023] [Indexed: 02/16/2023] Open
Abstract
BACKGROUND
Little is known regarding factors associated with calcitriol and a relative measure of calcitriol, the calcitriol-24,25-dihydroxyvitamin D3-calcifediol proportion ratio (C24CPR).
METHODS
Using a cross-sectional study design, healthy young adults of African and European descent, matched (1:1) on age (+/- 5 years) provided a blood sample in non-summer months (N=376). Vitamin D metabolites were measured in plasma with high performance liquid chromatography/tandem mass spectrometry (HPLC/MS-MS). West African genetic ancestry proportion (WGA) was estimated using STRUCTURE modeling of genetic ancestry-informative markers. Multivariable regression models were used to estimate the association of WGA and vitamin D-pathway gene variants with calcitriol and C24CPR, controlling for days from summer solstice, age, sex, blood pressure, body mass index, dietary vitamin D intake, oral contraceptive/medroxyprogesterone acetate use, smoking, tanning bed use, and time of day.
RESULTS
Calcitriol and C24CPR were not highly correlated (rho=0.14), although both were significantly, positively, and monotonically associated with WGA (p-trends 0.025 and <0.001, respectively). In fully adjusted models, genetic factors explained a greater proportion of variability in C24CPR (R2=0.121 and 0.310, respectively). Variants in genes with associated with calcitriol (CALB1, CYP27B1, GC, PPARGC1A) differed from those associated with C24CPR (CYP3A43, FGF23, KL, VDR).
CONCLUSIONS
Both absolute and relative measures of calcitriol were significantly higher among African Americans. Otherwise, these biomarkers appear to be genetically distinct.
IMPACT
C24CPR may be better suited to personalized medicine, due to a higher proportion of population variability explained by genetic variation and a less skewed distribution.
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