BONE MINERAL DENSITY AND VITAMIN D RECEPTOR GENETIC VARIANTS IN EGYPTIAN CHILDREN WITH BETA THALASSEMIA ON VITAMIN D SUPPLEMENTATION

Main Article Content

Hadeer A Abbassy
Reham Abdel Haleem Abo Elwafa http://orcid.org/0000-0003-2113-3569
Omneya Magdy Omar

Keywords

Vitamin D, VDR genetic variants, BMD, Osteoporosis, DEXA, Thalassemia.

Abstract

Background: Low bone mineral density (BMD) is a characteristic feature of Beta thalassemia major (?TM) patients. Vitamin D is important for bone mineralization. Vitamin D receptors (VDR) genetic variants may be related to vitamin D status and BMD.

Objectives:  To evaluate the effect of VDR genetic variants on vitamin D levels and BMD in ?TM Egyptian patients supplemented with vitamin D.

Methods: This study was conducted on forty children with ?TM and forty unrelated healthy sex and age-matched controls. Serum calcium, phosphorus, ALP, ferritin and vitamin D were measured. VDR genetic variants (BsmI, TaqI, and FokI) were genotyped by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). BMD was measured by dual-energy X-ray densitometry (DEXA) of the lumbar spine.

Results: In ?TM patients, 22.5% had deficient, 50% had insufficient and only 27.5% had sufficient levels of vitamin D. BMD Z score was significantly lower in ?TM patients compared to controls (p<0.001). Osteopenia and osteoporosis of lumbar spines were observed in 70% and 22.5% of ?TM patients respectively. BsmI bb and FokI Ff and ff genotypic variants were significantly associated with lower vitamin D and BMD Z score. No association was observed with TaqI genotypic variants.

Conclusions: We reported a high prevalence of low BMD in ?TM despite vitamin D supplementation. The BsmI bb, FokI Ff and ff genotypic variants of VDR can be considered as risk factors for the occurrence of osteoporosis in these children. Vitamin D doses should be adjusted individually according to the genetic makeup of each patient.

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