title: [Genetic polymorphism in tyrosine hydroxylase gene and essential hypertension in Hunan Han population].
abstract: OBJECTIVE
  To investigate the association of tyrosine hydroxylase (TH) C-824T polymorphism with essential hypertension (EH) susceptibility in Hunan Han population by a case-control study.
  
  
  METHODS
  A case-control study was performed on 368 EH patients and 353 healthy controls of Han nationality recruited in Hunan province. Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP)was used to genotype the C-824T polymorphism.
  
  
  RESULTS
  (1) Genotype frequencies for TH-824CC and -824CT+-824TT genotypes were 89.9% and 10.1%, respectively for EH patients and 88.7% and 11.3%, respectively for the controls. No significant difference in the genotype distribution of C-824T polymorphism between the patients and controls was observed (P=0.579). Allele frequencies of TH C-824T also showed no significant difference between the patients and controls (P=0.515). (2) When adjusted by EH risk factors, results of unconditional logistic regression analysis showed that there was no association between TH C-824T polymorphism and EH susceptibility (P=0.264). (3) When stratified by gender, no significant difference in the genotype distribution of TH C-824T polymorphism was observed between the patients and controls in either male or female subjects (P=0.841 and P=0.288). (4) Diastolic blood pressure (DBP) in individuals with -824 CT+TT genotype was significantly higher than that in individuals with -824 CC genotype in the controls (P=0.015). (5) When stratified by gender, significant difference in DBP between TH C-824T CT+TT genotype and CC genotype was observed in the male (P= 0.018) but not in the female (P=0.083) controls.
  
  
  CONCLUSIONS
  There is no association between TH gene C-824T polymorphism and EH susceptibility in Hunan Han population. The TH gene C-824T polymorphism is possibly associated with increased DBP in the males in Hunan Han population.
authors.affiliation: Department of Rheumatology, The First Affiliated Hospital of Nanhua University, Hengyang Hunan 421001, China.
authors.forename: Lujia
authors.initials: L
authors.lastname: Chen
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Chen
authors.forename: Ruizheng
authors.initials: R
authors.lastname: Shi
authors.forename: Yijie
authors.initials: Y
authors.lastname: Guo
authors.forename: An
authors.initials: A
authors.lastname: Chen
authors.forename: Yongping
authors.initials: Y
authors.lastname: Bai
authors.forename: Jia
authors.initials: J
authors.lastname: Chen
authors.forename: Tianlun
authors.initials: T
authors.lastname: Yang
authors.forename: Guogang
authors.initials: G
authors.lastname: Zhang
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D002681:China / Q000208:ethnology; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D006973:Hypertension / Q000201:enzymology / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D012737:Sex Factors; D014446:Tyrosine 3-Monooxygenase / Q000235:genetics*
chemical_list: D014446:Tyrosine 3-Monooxygenase