title: [The gene polymorphism of delta-aminolevulinate dehydratase (ALAD) in 530 cases of Chinese Han population].
abstract: OBJECTIVE
  To explore the distribution of allele and genotype frequencies of delta-aminolevulinate dehydratase (ALAD) gene in Chinese Han population.
  
  
  METHODS
  Blood specimens were collected from 530 unrelated Han individuals in the Central Plain of China. The ALAD genotype was determined using polymerase chain reaction-restriction fragment length polyporphism (PCR-RFLP) method.
  
  
  RESULTS
  The frequencies of genotype in Chinese Han ethnic were 93.58% (496) for the ALAD(1 - 1) homozygote, 6.23% (33) for the ALAD(1 - 2) heterozygotes and 0.19% (1) for the ALAD(2 - 2) homozygote, respectively. The allele frequencies of the ALAD(1) and ALAD(2) were 0.967 and 0.033, respectively.
  
  
  CONCLUSIONS
  The frequency of the ALAD(2) allele in Chinese Han population was similar to that in Asian populations and lower than that in Caucasian population.
authors.affiliation: Institute of Occupational Medicine, Chinese Academy of Preventive Medicine, Beijing 100050, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Zheng
authors.forename: W
authors.initials: W
authors.lastname: Song
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D044466:Asian People / Q000235:genetics*; D002648:Child; D002675:Child, Preschool; D002681:China / Q000208:ethnology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D000623:Porphobilinogen Synthase / Q000235:genetics*
chemical_list: D000623:Porphobilinogen Synthase