title: [Study on the association between estrogen receptor alpha gene polymorphism and intrahepatic cholestasis of pregnancy].
abstract: OBJECTIVE
  To investigate the relationship between estrogen receptor alpha (ERalpha) gene polymorphism and intrahepatic cholestasis of pregnancy (ICP).
  
  
  METHODS
  The Xba I and Pvu II polymorphisms in intron 1 of ER alpha gene were detected by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method in 100 pregnant women with ICP (ICP group) and 100 normal pregnant women (control group).
  
  
  RESULTS
  (1) The frequencies of XX, Xx and xx genotypes of Xba I polymorphism were 6%, 33% and 61% respectively in control group, and were 2%, 33% and 65% respectively in ICP group. There was no significant difference in the distribution of Xba I genotypes between the two groups (P > 0.05). The frequencies of the two alleles X and x were 23% and 78% in control group, and were 19% and 82% in ICP group, respectively. There was also no significant difference in the frequency of Xba I alleles between the two groups (P > 0.05). (2) The frequencies of PP, Pp and pp genotypes of Pvu II polymorphism were 18%, 42% and 40% respectively in control group, and were 12%, 53% and 35% respectively in ICP group. There was no significant difference in the distribution of Pvu II genotypes between the two groups (P > 0.05). The frequencies of the two alleles P and p were 39% and 61% in control group, and were 39% and 62% in ICP group, respectively. There was also no significant difference in the frequency of Pvu II alleles between the two groups (P > 0.05). (3) There was also no significant difference in the distribution of Xba I and Pvu II combinative genotype between the two groups (P > 0.05).
  
  
  CONCLUSIONS
  The ERalpha gene polymorphism is not associated with the risk of ICP.
authors.affiliation: Department of Obstetrics and Gynecology, West China Second Hospital, Sichuan University, Chengdu 610041, China.
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.forename: Shu-yun
authors.initials: SY
authors.lastname: Liu
authors.forename: Qing-yun
authors.initials: QY
authors.lastname: Shi
authors.forename: Qiang
authors.initials: Q
authors.lastname: Chen
authors.forename: Hai
authors.initials: H
authors.lastname: Zou
authors.forename: Ai-yun
authors.initials: AY
authors.lastname: Xing
mesh_terms: D000328:Adult; D000483:Alleles; D002780:Cholestasis, Intrahepatic / Q000235:genetics*; D047628:Estrogen Receptor alpha / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D012150:Polymorphism, Restriction Fragment Length; D011247:Pregnancy; D011248:Pregnancy Complications / Q000235:genetics*; D012307:Risk Factors
chemical_list: D047628:Estrogen Receptor alpha