title: [Study of the association between HLA-DQA1 alleles and environmental factors in psoriasis].
abstract: OBJECTIVE
  To study of the HLA-DQA(1) alleles and environment interaction in type I psoriasis.
  
  
  METHODS
  Using case-control study, 144 type I psoriatics and 273 healthy people were investigated. The HLA-DQA(1) alleles were examined by PCR-SSP.
  
  
  RESULTS
  (1) HLA-DQA(1)*0104 and DQA(1)*0201 alleles were positively associated with type I psoriasis (P(c) < 0.002); HLA-DQA(1)*0501 allele was negatively associated with type I psoriasis (P(c) < 0.000 5). (2) The HLA-DQA(1)*0104 allele and moisture was interaction in type I psoriasis (P = 0.023 8, OR = 5.29). (3) There were no interactions between the HLA-DQA(1)*0201 allele and 10 environmental factors in type I psoriasis. (4) The HLA-DQA(1)*0501 allele, moisture (P = 0.002 4, OR = 7.50), eating fish and shrimp (P = 0.000 4, OR = 12.92), drugs (P = 0.043 3, OR = 9.43) or vaccination (P = 0.043 3, OR = 9.43) were interacted in type I psoriasis.
  
  
  CONCLUSIONS
  (1) HLA-DQA(1)*0104 and DQA(1)*0201 alleles might be the susceptible genes or it may have close linkage with the susceptible gene. HLA-DQA(1)*0501 allele had protective effect against the development of type I psoriasis. (2) The HLA-DQA(1)*0104 and DQA(1)*0501 alleles increased risk possibility of environmental factors in type I psoriasis.
authors.affiliation: Institute of Dermatology, The First Affiliated Hospital of Anhui Medical University, Hefei 230032, China.
authors.forename: Shengcai
authors.initials: S
authors.lastname: Wei
authors.forename: Min
authors.initials: M
authors.lastname: Gao
authors.forename: Xuejun
authors.initials: X
authors.lastname: Zhang
authors.forename: Sen
authors.initials: S
authors.lastname: Yang
mesh_terms: D000293:Adolescent; D000328:Adult; D000483:Alleles; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D004777:Environment; D005260:Female; D006683:HLA-DQ Antigens / Q000235:genetics*; D059848:HLA-DQ alpha-Chains; D006801:Humans; D008297:Male; D011565:Psoriasis / Q000209:etiology* / Q000235:genetics / Q000276:immunology
chemical_list: D006683:HLA-DQ Antigens; D059848:HLA-DQ alpha-Chains; C069050:HLA-DQA1 antigen