title: [Relationship between the Fnu4HI site polymorphism of monoamine oxidase A gene and Parkinson's disease].
abstract: OBJECTIVE
  To study the association between the polymorphism of human monoamine oxidase type A (MAO-A) gene and Parkinson's disease(PD).
  
  
  METHODS
  Fnu4HI restriction fragment length polymorphism(RFLP) and PCR-RFLP were used to detect the mutation of MAO-A gene. The frequencies of alleles and genotypes at the MAO-A Fnu4HI locus on the X chromosome in different PD group were compared with those of the control group.
  
  
  RESULTS
  It was found that the frequencies of G allele in the patients with PD and controls were 0.613 and 0.527 respectively, P=0.039  "the frequencies of TT genotype were 0.303 and 0.415(P=0.014), and the frequencies of GG genotype were 0.564 and 0.451 respectively(P=0.021). When the patients were divided into two groups by age-onset, significant difference in the allelic and genotypic frequencies was observed only between early-onset PD group and control group. And when the PD patients were grouped by sex, significant difference was observed only between male PD group and male control group (the frequencies of G allele being 0.669 and 0.500 respectively, P=0.005).
  
  
  CONCLUSIONS
  This study revealed significant differences between PD group and control group in allelic and genotypic frequencies. The findings supported the hypothesis about an association between MAO-A gene and PD, suggesting that age at onset of PD and gender predisposition might be related to the putative association, and Fnu4HI SNP be a risk factor for PD.
authors.affiliation: Institute for Neuroscience, Capital University of Medical Sciences, Beijing, 100054 PR China.
authors.forename: Xiao-hua
authors.initials: XH
authors.lastname: Jiang
authors.forename: Hui
authors.initials: H
authors.lastname: Yang
authors.forename: Jing-fang
authors.initials: JF
authors.lastname: Yang
authors.forename: Xiu-min
authors.initials: XM
authors.lastname: Dong
authors.forename: Qun-yuan
authors.initials: QY
authors.lastname: Xu
authors.forename: Biao
authors.initials: B
authors.lastname: Chen
mesh_terms: D000483:Alleles; D044466:Asian People; D015252:Deoxyribonucleases, Type II Site-Specific / Q000032:analysis / Q000235:genetics*; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008297:Male; D008995:Monoamine Oxidase / Q000235:genetics*; D010300:Parkinson Disease / Q000235:genetics*; D011110:Polymorphism, Genetic / Q000235:genetics*; D012150:Polymorphism, Restriction Fragment Length
chemical_list: D008995:Monoamine Oxidase; D015252:Deoxyribonucleases, Type II Site-Specific