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Environmental UVR Levels and Skin Pigmentation Gene Variants Associated with Folate and Homocysteine Levels in an Elderly Cohort

Jones, Patrice; Lucock, Mark; Scarlett, Christopher J.; Veysey, Martin; Beckett, Emma

Authors

Patrice Jones

Mark Lucock

Christopher J. Scarlett

Martin Veysey

Emma Beckett



Abstract

Ultraviolet radiation (UVR) is a ubiquitous exposure which may contribute to decreased folate levels. Skin pigmentation mediates the biological effect of UVR exposure, but its relationship to folate levels is unexamined. Interactions may exist between UVR and pigmentation genes in determining folate status, which may, in turn, impact homocysteine levels, a potential risk factor for multiple chronic diseases. Therefore, independent and interactive influences of environmental UVR and genetic variants related to skin pigmentation (MC1R-rs1805007, IRF4-rs12203592 and HERC2-rs12913832) on folate (red blood cell (RBC) and serum) and homocysteine levels were examined in an elderly Australian cohort (n = 599). Genotypes were assessed by RT/RFLP-PCR, and UVR exposures were assessed as the accumulated erythemal dose rate accumulated over 4 months (4M-EDR). Multivariate analysis found significant negative associations between 4M-EDR and RBC folate (p < 0.001, β = -0.19), serum folate (p = 0.045, β = -0.08) and homocysteine levels (p < 0.001, β = -0.28). Significant associations between MC1R-rs1805007 and serum folate levels (p = 0.020), and IRF4-rs12203592 and homocysteine levels (p = 0.026) occurred but did not remain significant following corrections with confounders. No interactions between 4M-EDR and pigmentation variants in predicting folate/homocysteine levels were found. UVR levels and skin pigmentation-related variants are potential determinants of folate and homocysteine status, although, associations are mixed and complex, with further studies warranted.

Journal Article Type Article
Publication Date Feb 28, 2020
Journal International Journal of Environmental Research and Public Health
Print ISSN 1660-4601
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 17
Issue 5
Article Number 1545
APA6 Citation Jones, P., Lucock, M., Scarlett, C. J., Veysey, M., & Beckett, E. (2020). Environmental UVR Levels and Skin Pigmentation Gene Variants Associated with Folate and Homocysteine Levels in an Elderly Cohort. International Journal of Environmental Research and Public Health, 17(5), https://doi.org/10.3390/ijerph17051545
DOI https://doi.org/10.3390/ijerph17051545
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