title: [Study on the relationship between ER Rsa I gene polymorphism and children's dental fluorosis].
abstract: OBJECTIVE
  To explore the distribution of ER Rsa I genotype in children who lived in the areas with or without high fluoride, and evaluate the relationship between ER Rsa I gene polymorphism and children's dental fluorosis.
  
  
  METHODS
  Children aged 8 to 12 years, born and raised in high fluoride areas and control areas in two counties of Henan Province were recruited. The Rsa I marker of ER gene was genotyped in 237 children composed of both dental fluorosis cases and controls by PCR-RFLP procedure. Urine fluoride was detected with fluoride ion selective electrode method.
  
  
  RESULTS
  The frequency distribution of ER Rsa I genotype was rr 60.81% (45/74), Rr 27.02% (20/74), RR 12.16% (9/74) in children with fluorosis; rr 73.91% (51/69), Rr 20.29% (14/69), RR 5.80% (4/69) in children without fluorosis from high fluoride areas, and rr 63.83% (60/94), Rr 34.04% (32/94), RR 2.13% (2/94) in the children without fluorosis from control areas respectively. There were no significant differences in the three groups (P>0.05), but children carrying allele R of ER Rsa I had a significantly increased risk of dental fluorosis (OR=1.821, 95% CI: 1.013-3.274) compared to children carrying the allele r in endemic fluorosis areas.
  
  
  CONCLUSIONS
  Although no significant difference was found in ER Rsa I genotype between cases and non-dental fluorosis in endemic fluorosis areas, children carrying R allele of ER Rsa I had a higher risk compared to children carrying r allele, and the further study is needed.
authors: Department of Environmental Health, Zhengzhou University School of Public Health, Zhengzhou, China.
authors: Yue
authors: Y
authors: Ba
authors: Hai-Xia
authors: HX
authors: Li
authors: Gong-Ju
authors: GJ
authors: Yin
authors: Wei-Hua
authors: WH
authors: Wu
authors: Bo
authors: B
authors: Yu
authors: Xue-Min
authors: XM
authors: Cheng
authors: Liu-Xin
authors: LX
authors: Cui
mesh_terms: D002648:Child; D002681:China; D005260:Female; D009050:Fluorosis, Dental / Q000235:genetics*; D006801:Humans; D008297:Male; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D011960:Receptors, Estrogen / Q000235:genetics*
chemical_list: D011960:Receptors, Estrogen