title: Polymorphisms in the interleukin-20 gene: relationships to plaque-type psoriasis.
abstract: We analyzed the frequency of single-nucleotide polymorphisms (SNPs) at positions -1053 (rs 2981572), 1380 (rs 2981573), 1462 (rs 2232360), and 3978 (rs 1518108) of the human interleukin-20 (IL-20) gene by tetraprimer ARMS-PCR method. A significant association between patients with psoriasis and the G allele at position -1053 (P<0.05) was established. The pairwise linkage disequilibrium (LD) matrix showed that the nearly complete LD was present within the polymorphisms at positions -1053, 1380, and 1462 of the IL-20 gene. We found that patients with plaque psoriasis had a higher frequency of the HT3 GAA haplotype (P<0.01, OR 2.341, 95% CI: 1.346-4.074) compared to the control group. Likewise, the HT3 GAA haplotype was associated with an increased risk of early-onset psoriasis (P<0.01, OR 2.305, 95% CI: 1.285-4.132), late onset of disease (P<0.01, OR 2.542, 95% CI: 1.266-5.102), familial psoriasis (P<0.02, OR 2.220, 95% CI: 1.249-3.945), and sporadic disease (P<0.01, OR 2.523, 95% CI: 1.390-4.580). Our data indicate that IL-20 gene polymorphisms should have a role in determining susceptibility to plaque-type psoriasis. The possible role of the studied SNPs in the regulation of the expression of IL-20 is unknown yet and needs further studies.
authors.affiliation: Department of Dermatology and Venerology, University of Tartu, Tartu, Estonia.
authors.forename: K
authors.initials: K
authors.lastname: Kingo
authors.forename: S
authors.initials: S
authors.lastname: Kõks
authors.forename: T
authors.initials: T
authors.lastname: Nikopensius
authors.forename: H
authors.initials: H
authors.lastname: Silm
authors.forename: E
authors.initials: E
authors.lastname: Vasar
mesh_terms: D000328:Adult; D000483:Alleles; D017931:DNA Primers; D004957:Estonia; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease / Q000235:genetics; D005838:Genotype; D006239:Haplotypes / Q000235:genetics; D006801:Humans; D007378:Interleukins / Q000235:genetics* / Q000378:metabolism; D016013:Likelihood Functions; D015810:Linkage Disequilibrium; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D011565:Psoriasis / Q000235:genetics*
chemical_list: D017931:DNA Primers; D007378:Interleukins; C422042:interleukin 20