Association Between Vitamin D-Binding Protein (Vdbp) Gene Polymorphism and Vitamin D Status in Young Children

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Object of the research: VDBP gene polymorphism. Problem being addressed: the effect of existing polymorphic variants of the VDBP gene on the absorption of vitamin D in young children. The main scientific results. At the beginning of the survey, vitamin D supplementation was performed in 50.0±9.1 % (15/30) of children. The concentration of 25 (OH) D in the serum of the subjects was 32.9 ng/ml (23.2–60.0). All patients with the GG rs 7041 genotype of the VDBP gene had a concentration of 25 (OH) D in the range of 20-100 ng/ml, which is statistically more common than in children with the AA rs 4588 genotype (p=0.015), GT rs 7041 genotype (p=0.047) and genotype TT rs 7041 (p=0.033). Patients with CA rs 4588 genotypes – 23.7 ng/ml (14.8-35.8) and GT rs 7041 – 28.1 ng/ml (17.1–49) had the lowest serum levels of 25 (OH) D, the highest levels of 25 (OH) D – children with genotype AA rs 4588 – 122.6 ng/ml (23.2–124.1) and genotype TT rs 7041 – 78.6 ng/ml (23.2 –124.1). Carriers of the AA rs 4588 genotype were more likely than patients with the GG rs 7041 genotype to show dangerously high levels of 25 (OH) D (p=0.069). Patients with the AA rs 4588 genotype had lower alkaline phosphatase levels compared to the GT rs 7041 and CC rs 4588 genotypes – 185.0 U/l (147.0–212.0) versus 259.5 U/l (207.0–334.5), p=0.021 and against 251.0 U/l (222.0–346.0), p=0.016. Area of practical application of research results: The results of the study can be used by working groups to make recommendations for the prevention and treatment of vitamin D deficiency and in the practice of health care facilities. Innovative technological product: association between allelic variants of the VDBP gene and vitamin D status in young children. Scope of application of innovative technological product: pediatrics, medical genetics. Conclusions. Genetic variants of VDBP may affect the absorption of vitamin D and cause variability in 25 (OH) D levels, which complicates the development of uniform recommendations for optimal prophylactic doses of vitamin D and necessitates additional research. The highest levels of 25 (OH) D were recorded in children with genotypes AA rs 4588 and TT rs 7041 of the VDBP gene, which showed high absorption when taking vitamin D supplements at a dose of 500 IU and even excessive concentrations of 25 (OH) D with long-term supplementation in higher dose.