title: Association between psoriasis vulgaris and MHC-DRB, -DQB genes as a contribution to disease diagnosis.
abstract: We analyzed 100 control individuals and 60 patients with psoriasis vulgaris from the population of Campinas, Brazil. Typification of class II HLA alleles (HLA-DRB1-5 and -DQB1) was carried out through the DNA/PCR/SSP at medium and high resolution. DNA was extracted through a salting-out procedure: 13 DRB1 alleles, 3 DRB3 alleles, 1 DRB4 allele, 2 DRB5 alleles, and 5 DQB1 alleles were identified at a medium resolution using the PCR/SSP, and 45 DRB1 alleles were identified at a high resolution in analyzed patients. Results showed associations with psoriasis vulgaris: positive associations HLA-DRB3*02 (p < 0.05, chi(2) = 5.10, RR = 2.14); HLA-DRB1*0102 alleles (p < 0.05, RR = 5.44). Negative associations were found for HLA-DRB4*01 (chi(2) = 3.23, RR = 0.55) and HLA-DRB1*1302 alleles (p < 0.05, RR = 0.23). The haplotypes revealed positive association for HLA-DRB1*0102/DQB1*05 (p < 0.05, RR = 5.44) and HLA-DRB1*0701/DQB1*03 alleles (p < 0.02, RR = 9.00). These findings suggest a possible association of the DRB1 allele with the group of patients showing an early onset of the illness, as well as an association with haplotypes HLA-DRB1*0102/DQB1*05 and HLA-DRB1*0701/DQB1*03.
authors.affiliation: Department of Clinical Pathology, School of Medical Sciences, State University of Campinas (UNICAMP), Rua Gustavo Rodrigues Dória, 255, CEP 13083-060 Campinas - SP Brazil.
authors.forename: Claudia Bueno
authors.initials: CB
authors.lastname: Cardoso
authors.forename: Ana Maria
authors.initials: AM
authors.lastname: Uthida-Tanaka
authors.forename: Renata Ferreira
authors.initials: RF
authors.lastname: Magalhães
authors.forename: Luiz Alberto
authors.initials: LA
authors.lastname: Magna
authors.forename: Maria Helena Stangler
authors.initials: MH
authors.lastname: Kraemer
mesh_terms: D001938:Brazil / Q000453:epidemiology; D016022:Case-Control Studies; D016009:Chi-Square Distribution; D005260:Female; D005786:Gene Expression Regulation; D020022:Genetic Predisposition to Disease / Q000453:epidemiology*; D006683:HLA-DQ Antigens / Q000235:genetics*; D006684:HLA-DR Antigens / Q000235:genetics*; D059811:HLA-DRB1 Chains; D006239:Haplotypes / Q000235:genetics*; D006801:Humans; D008297:Male; D016133:Polymerase Chain Reaction / Q000379:methods; D011336:Probability; D011565:Psoriasis / Q000175:diagnosis / Q000235:genetics*; D012720:Severity of Illness Index
chemical_list: D006683:HLA-DQ Antigens; D006684:HLA-DR Antigens; D059811:HLA-DRB1 Chains