title: Dopamine receptor gene polymorphisms in Guangzhou Hans.
abstract: OBJECTIVE
  To determine the distribution of dopamine D2, D3, and D5 receptor(DRD2, DRD3, DRD5) gene polymorphisms in Guangzhou Hans.
  
  
  METHODS
  A total of 141 healthy Guangzhou Hans were studied by the use of polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and PCR-amplification of specific allele (PASA) techniques. Current results were compared with the data on other ethnic groups.
  
  
  RESULTS
  Within the 141 individuals tested, the frequencies of the A1(Taq I-) and A2(Taq I+) alleles of the TaqI A mutation site in the 3'non-coding region of the DRD2 gene were found to be 48% and 52%, respectively. The observed frequencies of the A1A1, A1A2 and A2A2 genotypes were found to be 17%, 52% and 31%, respectively, which met Hardy-Weinberg equilibrium. The frequencies of the A1 and A2 alleles of the Bal I mutation site in the exon 1 of DRD3 gene were found to be 73% and 27%, respectively. The observed frequencies of the A1A1, A1A2 and A2A2 genotypes were found to be 53%, 39% and 8%, respectively, which met Hardy-Weinberg equilibrium. The frequencies of the 1 and 2 alleles of the Msp I mutation site in the intron 5 of DRD3 gene were found to be 62.5% and 37.5%, respectively. The observed frequencies of the 1-1, 1-2 and 2-2 genotypes were found to be 35%, 55% and 10%, respectively, which met Hardy-Weinberg equilibrium. No linkage disequilibrium was observed between the Bal I and Msp I polymorphism in Guangzhou Hans(chi(2)=0165, P>0.05). The frequencies of the T and C alleles of the T978C mutation site of DRD5 gene were found to be 51% and 49%, respectively. The observed frequencies of the T/T, T/C and C/C genotypes were found to be 23.6%, 54.6% and 21.8%, respectively, which met Hardy-Weinberg equilibrium.
  
  
  CONCLUSIONS
  The polymorphisms of DRD2, DRD3, DRD5 gene in Guangzhou Hans were high and different from those in other populations.
authors.affiliation: Department of Neurology, the First Affiliated Hospital, Sun Yat-sen University of Medical Sciences, Guangzhou, 510080 P.R.China. jian-w@163.net
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: Z
authors.initials: Z
authors.lastname: Liu
authors.forename: B
authors.initials: B
authors.lastname: Chen
authors.forename: J
authors.initials: J
authors.lastname: Li
authors.forename: Y
authors.initials: Y
authors.lastname: Pan
authors.forename: X
authors.initials: X
authors.lastname: Lu
authors.forename: Y
authors.initials: Y
authors.lastname: Zhu
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000483:Alleles; D002681:China / Q000208:ethnology; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D011954:Receptors, Dopamine / Q000235:genetics*
chemical_list: D011954:Receptors, Dopamine