title: A new extended haplotype Cw*0602-B57-DRB1*0701-DQA1*0201-DQB1*0201 associated with psoriasis in the Croatian population.
abstract: In this study, we have analysed the distribution of HLA class II alleles and the extended haplotype HLA-Cw-B-DRB1-DQA1-DQB1 in Croatian patients with type I and type II psoriasis by hybridization with specific oligonucleotide probes. Type I psoriasis showed a significant association with the DRB1*0701 [P < 0.00001; relative risk (RR) = 5.83], DQA1*0201 (P < 0.00001; RR = 6.12), DQB1*0201 (P = 0.0006; RR = 3.29) and DQB1*0303 alleles (P = 0.0008; RR = 7.51). A negative correlation with type I disease was observed for the DQA1*0102 allele (P = 0.002; RR = 0.26). Type II psoriasis did not show any association with any class II alleles. The extended haplotype HLA-Cw*0602-B57-DRB1*0701-DQA1*0201-DQB1*0201 was present at a significantly higher frequency in type I patients (P < 0.00001; RR = 7.72). However, this haplotype was not detected at all in patients with type II psoriasis. In conclusion, the extended haplotype HLA-Cw*0602-B57-DRB1*0701-DQA1*0201-DQB1*0201 is a risk haplotype for type I disease in the Croatian population. This particular haplotype has not been reported previously in association with psoriasis in any other ethnic groups.
authors.affiliation: Department of Dermatology, University Hospital Rijeka, Rijeka and Tissue Typing Centre, University Hospital Rebro, Zagreb, Croatia. marija_kastelan@yahoo.com
authors.forename: M
authors.initials: M
authors.lastname: Kastelan
authors.forename: F
authors.initials: F
authors.lastname: Gruber
authors.forename: E
authors.initials: E
authors.lastname: Cecuk-Jelicić
authors.forename: Z
authors.initials: Z
authors.lastname: Grubić
authors.forename: A
authors.initials: A
authors.lastname: Kastelan
mesh_terms: D000483:Alleles; D017523:Croatia / Q000208:ethnology; D006239:Haplotypes / Q000235:genetics*; D000949:Histocompatibility Antigens Class II / Q000235:genetics*; D006801:Humans; D011565:Psoriasis / Q000235:genetics*; D012307:Risk Factors
chemical_list: D000949:Histocompatibility Antigens Class II