Polymorphisms of the IL12B and IL23R genes are associated with psoriasis

J Invest Dermatol. 2008 Jul;128(7):1653-61. doi: 10.1038/sj.jid.5701255. Epub 2008 Jan 24.


Psoriasis is a common inflammatory and hyperproliferative skin disease with a multifactorial genetic basis. A recent study reported that psoriasis was associated with the IL12B haplotype rs3212227 (3'-untranslated region)-rs6887695 (60 kb, 5') and the IL23R haplotype rs7530511 (L310P)-rs11209026 (Q381R). We examined these four single-nucleotide polymorphisms (SNPs) for association with psoriasis in two groups of North American and German Caucasians: (1) 1,810 cases and 2,522 controls; and (2) 509 pedigrees. Both IL12B markers showed highly significant association with psoriasis in the case-control (rs3212227, odds ratio (OR)=1.62, P=1.7 x 10(-15); rs6887695, OR=1.49, P=2.7 x 10(-15)) and in the family-based analysis (rs3212227, P=2.2 x 10(-3); rs6887695, P=1.7 x 10(-3)). The IL23R SNPs also showed significant association in the cases and controls (rs7530511, OR=1.22, P=3.9 x 10(-3); rs11209026, OR=1.40, P=3.8 x 10(-4)). For both genes, common risk haplotypes were identified whose statistical significance approached (IL23R) or exceeded (IL12B) genome-wide criteria. We found no statistical evidence for interactions of these haplotypes with HLA-Cw6. Our results confirm associations between IL12B and IL23R and psoriasis in Caucasians, and provide a genetic basis for the clinical association between psoriasis and Crohn's disease.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Case-Control Studies
  • Gene Frequency
  • Haplotypes
  • Humans
  • Interleukin-12 Subunit p40 / genetics*
  • Pedigree
  • Polymorphism, Single Nucleotide*
  • Psoriasis / genetics*
  • Receptors, Interleukin / genetics*


  • IL23R protein, human
  • Interleukin-12 Subunit p40
  • Receptors, Interleukin