title: Frequency of fokI and taqI polymorphism of vitamin D receptor gene in Indian population and its association with 25-hydroxyvitamin D levels.
abstract: BACKGROUND
  The VDR protein is at the centre of the vitamin D endocrine system, a complex physiological system with substantial feedback regulatory mechanisms involved in maintaining serum calcium and 1, 25 dihydroxy vitamin D3. Variations in VDR gene are shown to have implications in several diseases and have also been implicated as an important genetic factor affecting bone mass.
  
  
  OBJECTIVE
  To determine the frequency of Fok I and Taq I variants in healthy Indian individuals and its association with 25-OH-Vitamin D levels.
  
  
  METHODS
  Blood samples were collected from 143 unrelated normal individuals (Male-84 and Female-59) and their genotypes determined.
  
  
  METHODS
  After amplification by polymerase chain reaction, each polymorphism was genotyped by restriction fragment length polymorphism. For 100 normal healthy individuals 25-hydroxyvitamin D estimation was done using DiaSorin kit method.
  
  
  METHODS
  Graph pad software was used to calculate the P values from the Chi-square.
  
  
  RESULTS
  Out of 143 samples analyzed for FokI and TaqI polymorphisms the following genotypic frequency was obtained FF 59%, Ff 36%, ff 5% and TT 49%, Tt 43%, tt 8% respectively.
  
  
  CONCLUSIONS
  Results indicate that the distribution of the polymorphic loci Fok I and Taq I vary considerably not only in different populations, but also within India. Furthermore, when the genotypes were analyzed with respect to 25-OH-Vitamin D levels, a significant association was seen for the Taq 1 SNP but not with the Fok I.
authors.affiliation: Research and Development, SRL Ranbaxy Ltd, Plot No. 124, MIDC,17 Street, Andheri (East), Mumbai - 400 093, India.
authors.forename: Aparna A
authors.initials: AA
authors.lastname: Bhanushali
authors.forename: Namrata
authors.initials: N
authors.lastname: Lajpal
authors.forename: Smita S
authors.initials: SS
authors.lastname: Kulkarni
authors.forename: Sandeep S
authors.initials: SS
authors.lastname: Chavan
authors.forename: Sarita S
authors.initials: SS
authors.lastname: Bagadi
authors.forename: Bibhu R
authors.initials: BR
authors.lastname: Das