Background:The influence of vitamin D receptor (VDR) gene polymorphisms on the regulation of the parathyroid hormone is important in end-stage renal disease (ESRD) patients. We analyzed rs1544410 (BsmI) and rs731236 (TaqI) polymorphisms of VDR gene in hemodialysis patients to determine their relationship with serum intact parathyroid hormone (iPTH).Materials and Methods:Ninety hemodialysis patients were included in this study. Patients were classified into four groups according to their serum iPTH level. Polymorphisms of VDR gene were surveyed using polymerase chain reaction-restriction fragment length polymorphism method with BsmI and TaqI enzymes in all the patients.Results:Patients age ranged between 30 and 60 years (mean ± SD: 36.0 ± 11.4) and period undergoing hemodialysis 80 ± 71 months. Patients were divided into four groups based on the serum concentration of iPTH. The distribution of VDR gene allelic variation for BsmI and TaqI polymorphisms was different between the four groups of uremic patients. Analysis of data revealed a significant correlation between the TaqI variants and serum iPTH level. There was also a correlation between the BsmI variants and serum iPTH level in that patients with the BB genotype were more likely to have a higher serum iPTH level. However, the latter was not statistically significant.Conclusions:Genotype of the TaqI and BsmI VDR gene polymorphisms is reported in Iranian patients with ESRD. Those with tt or BB genotypes may develop more severe secondary hyperparathyroidism.
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