title: [Association between the genetic polymorphisms of beta2-adrenergic receptor gene and the asthma susceptibility and clinical phenotypes in a Chinese population].
abstract: OBJECTIVE
  To determine whether genetic polymorphisms of beta2-adrenergic receptor gene affect asthma susceptibility and play a role in disease regulation.
  
  
  METHODS
  One hundred and sixty-six unrelated childhood asthma cases and 32 families with 192 samples were studied. The polymorphisms at amino acid positions 16, 27, 164 and nucleic acid residue 523 were genotyped by polymerase chain reaction-restriction endonuclease digestion.
  
  
  RESULTS
  The amino acid 164 Thr/Ile variant was seen only in the heterozygote form, and it occurred with a frequency of 3% which is similar to the published results among Caucasians. There were significant differences in the allele frequencies of the other 3 polymorphisms between Chinese and the published results among Caucasians (P<0.001). No polymorphism was found to be associated with total serum IgE, the number of positive prick skin test and FEV1. No significant association was noted between either the arginine-glycine 16 or the glutamine-glutamate 27 polymorphisms and the airway responsiveness to beta2-agonists in childhood asthma cases.
  
  
  CONCLUSIONS
  In this study population, the authors were unable to confirm that the polymorphism of beta2-adrenergic receptor gene is a crucial factor of the susceptibility to asthma and a major genetic determinant of different clinical status.
authors.affiliation: Department of Biochemistry and Immunity, Capital Institute of Pediatrics, Beijing, 100020 P. R. China. hchen@public.bta.net.cn
authors.forename: Jin
authors.initials: J
authors.lastname: Fu
authors.forename: Hong
authors.initials: H
authors.lastname: Chen
authors.forename: Liangping
authors.initials: L
authors.lastname: Hu
authors.forename: Huiqin
authors.initials: H
authors.lastname: Zhang
authors.forename: Yu
authors.initials: Y
authors.lastname: Ma
authors.forename: Yuzhi
authors.initials: Y
authors.lastname: Chen
mesh_terms: D000328:Adult; D000368:Aged; D044466:Asian People / Q000235:genetics; D001249:Asthma / Q000235:genetics*; D002648:Child; D002675:Child, Preschool; D003062:Codon; D005260:Female; D005787:Gene Frequency / Q000235:genetics*; D020022:Genetic Predisposition to Disease; D006801:Humans; D007073:Immunoglobulin E / Q000097:blood / Q000235:genetics; D007223:Infant; D008297:Male; D008875:Middle Aged; D010375:Pedigree; D010641:Phenotype; D011110:Polymorphism, Genetic; D018343:Receptors, Adrenergic, beta-2 / Q000235:genetics*; D044465:White People / Q000235:genetics
chemical_list: D003062:Codon; D018343:Receptors, Adrenergic, beta-2; D007073:Immunoglobulin E