Environmental and genetic determinants of two Vitamin D metabolites in healthy Australian children
Methods: The study sample consisted of 322 healthy Australian children (predominantly Caucasians) who provided a venous blood sample. A parental interview was conducted and skin phototype and anthropometry measures were assessed. Concentrations of 25(OH)D3 and 1,25(OH)2D3 were measured by selective solid-phase extraction-capillary liquid chromatography-tandem mass spectrometry. These concentrations were deseasonalised where relevant to remove the effect of month of sampling.
Results: Deseasonalised log 25(OH)D3 and 1,25(OH)2D3 concentrations were only moderately correlated (r = 0.42, < 0.001). The following predicted both 25(OH)D3 and 1,25(OH)2D3: UVR 6 weeks before the interview, natural skin and eye colour, height and vitamin D allelic metabolism score. The following predicted 25(OH)D3 only: lifetime sunburns and vitamin D allelic synthesis score. Overall, 43.5% and 25.6% of variation in 25(OH)D3 and 1,25(OH)2D3 could be explained. After accounting for 25(OH)D3 concentrations, higher UVR 6 weeks before the interview and vitamin D allelic metabolism score further predicted 1,25(OH)2D3 concentrations.
Conclusions: Environmental factors and genetic factors contributed to both vitamin D metabolite concentrations. The intriguing finding that the higher ambient UVR contributed to higher 1,25(OH)2D3 after accounting for 25(OH)D3 concentrations requires further evaluation.
History
Publication title
Journal of Pediatric Endocrinology and MetabolismVolume
30Issue
5Pagination
531-541ISSN
0334-018XDepartment/School
Menzies Institute for Medical ResearchPublisher
Freund Publishing House LtdPlace of publication
Ste 500, Chesham House, 150 Regent St, London, England, W1R 5FaRights statement
© 2017 Walter de GruyterRepository Status
- Restricted