Association of Taq1 restriction site of Calcitonine gene and Alu1 (rs1801197) polymorphism of Calcitonin receptor gene with bone mineral density in 200 women over 45 years in Shahrekord city

Osteoporosis is the most common disorder in metabolism of bone minerals. Restriction site Taq1 in Calcitonine gene and AluI polymorphism in Calcitonin receptor gene as genetic factors can be associated with bone mineral density. The aim of this study was to determine the association of restriction site Taq1 and AluI polymorphism with bone mineral density. In this descriptive analytical study, 200 women over 45 years who referred to Bone Mineral Density Assay Centers in Shahrekord in years 1391-92 were included. Bone mineral density at femur neck and lumbar spine was measured by DEXA method. Based on T score, an indicator of bone mineral density these women divided to patient or osteoporotic group (130 persons) and healthy or control group (70 persons). Then different genotypes of Taq1 (TT/Tt/tt) and AluI (TT/TC/CC) were determined by PCR-RFLP method and data was analyzed by statistical tests, including Chi square and ANOVA. P values less than 0.05 was considered statistically significant. In control group the percent of genotype distribution for TT, TC and CC genotypes was 31.4%, 35.7% and 22.9%, respectively. In patient group the genotype distribution percentage for above genotypes was 31.54%, 63.08% and 5.38%, respectively. The P value of this polymorphism with bone mineral density was more than 0.05. Both in control and patient groups for Taq1 restriction site the tt genotype was seen. There was no association between each of AluI polymorphism and Taq1 restriction site and bone mineral density and it is possible that other genetic factors would be effective.