title: Genetic variability of histamine receptors in patients with Parkinson's disease.
abstract: BACKGROUND
  Changes in the density and expression of histamine receptors (HRH) have been detected in Parkinson's disease (PD) patients, and HRH antagonists bring about improvements in motor and other symptoms, thus suggesting that HRH play a role in the clinical response of PD patients. This study is aimed to analyse polymorphic variations of HRH in patients with PD.
  
  
  METHODS
  Leukocytary DNA from 195 PD patients and a control group of 231 unrelated healthy individuals was studied for the nonsynonymous HRH1Leu449Ser and the promoter HRH2G-1018A polymorphisms by using amplification-restriction analyses.
  
  
  RESULTS
  The HRH1Leu449Ser amino acid substitution was identified in two women with late-onset PD whereas it was not observed among healthy subjects. The HRH2G-1018A polymorphism was observed with allele frequencies = 3.59 (95% CI = 1.74-5.44) and 5.0 (95% CI = 3.00-6.96) for patients with PD and healthy controls, respectively. These frequencies were independent of gender and age of onset of the disease. Multiple comparison analyses revealed that differences were not statistically significant.
  
  
  CONCLUSIONS
  These results indicate that the polymorphisms analyzed are not a major risk factor for PD, although the HRH1Leu449Ser amino acid substitution might be related to PD.
authors: Department of Biochemistry and Molecular Biology, School of Biological Sciences, University of Extremadura, Badajoz, Spain. elenag@unex.es
authors: Elena
authors: E
authors: García-Martín
authors: P
authors: P
authors: Ayuso
authors: Antonio
authors: A
authors: Luengo
authors: Carmen
authors: C
authors: Martínez
authors: José Ag
authors: JA
authors: Agúndez
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019943:Amino Acid Substitution; D015331:Cohort Studies; D005260:Female; D005787:Gene Frequency; D014644:Genetic Variation; D006801:Humans; D008297:Male; D008875:Middle Aged; D021141:Nucleic Acid Amplification Techniques; D010300:Parkinson Disease / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D011969:Receptors, Histamine H1 / Q000235:genetics*; D011970:Receptors, Histamine H2 / Q000235:genetics*; D013030:Spain
chemical_list: D011969:Receptors, Histamine H1; D011970:Receptors, Histamine H2