Original Article
Association of vitamin D receptor gene ApaⅠpolymorphism with vitamin D deficiency rickets
XI Wei-ping, YANG Jian-ping, LI Lian-qing, ZHU Qing-yi, ZHOU Xiang-hong
Published 2005-07-16
Cite as Chin J Pediatr, 2005, 43(7): 514-516. DOI: 10.3760/cma.j.issn.0578-1310.2005.07.111
Abstract
ObjectiveTo study the association between vitamin D receptor (VDR) gene ApaⅠpolymorphism and vitamin D deficiency rickets in children of Shanxi Han ethnic group, and to explore the significance of individual hereditary factors in the development of rickets.
MethodsThis was a case control study. The grouping criteria were serum 25(OH)D3 level, blood bone alkaline phosphatase and clinical symptom, respectively. The laboratory test methods were enzyme linked immunoassay and radioimmunoassay. PCR-RFLP technology was applied to examine VDR gene ApaⅠ site polymorphism and Hardy-Weinberg hereditary balance test was used to examine the coincidence of gene distribution.
ResultsFrequencies of AA, Aa and aa genotypes were 5.0%, 52.5% and 42.5% in the rickets group and 4.4%, 55.9% and 39.7% in the control group, respectively. Frequencies of A and a genotypes were 31.3% and 68.7% in the rickets group and 32.3% and 67.7% in the control group, respectively. There was not significant difference in the frequency distribution of VDR genotype and allelic genes between two groups (χ2=0.089, P>0.05; χ2=0.028, P>0.05). There was significant difference in the serum 25(OH)D3 between two groups (t=-8.919, P<0.01).
ConclusionThe distribution of VDR gene ApaⅠpolymorphism in children of Han ethnic group is balanced relatively. The Frequency of a allelic genes is 67.7% which is therefore the superior gene. VDR gene polymorphism might not be important in an individual's susceptibility to development of vitamin D deficiency.
Key words:
Receptors, calcitriol; Polymorphism (genetics); Rickets
Contributor Information
XI Wei-ping
Department of Child Health Care, Shanxi Children′s Hospital, Taiyuan 030013, China
YANG Jian-ping
LI Lian-qing
ZHU Qing-yi
ZHOU Xiang-hong