Association of functional variants of PTPN22 and tp53 in psoriatic arthritis: a case-control study

Arthritis Res Ther. 2006;8(1):R27. doi: 10.1186/ar1880. Epub 2006 Jan 3.


Recent studies have implicated PTPN22 and tp53 in susceptibility to several autoimmune diseases, including rheumatoid arthritis, suggesting that these genes are important in maintaining immune homeostasis. Because autoimmune diseases may share similar susceptibility loci, investigation of these genes in psoriatic arthritis (PsA) is of potential relevance. As a result we investigated known coding polymorphisms in PTPN22 and tp53 in a homogenous Caucasian PsA cohort from Newfoundland, Canada and an admixed Caucasian PsA cohort from Toronto, Canada. We observed a moderate association of the R620W variant of PTPN22 with PsA in the Toronto population only. Because of the conflicting findings reported regarding the association of PTPN22 with PsA, further studies in other PsA populations are warranted.

MeSH terms

  • Adult
  • Arginine
  • Arthritis, Psoriatic / genetics*
  • Case-Control Studies
  • Cohort Studies
  • Female
  • Gene Frequency
  • Genetic Predisposition to Disease
  • Genetic Variation*
  • Genotype
  • Humans
  • Male
  • Newfoundland and Labrador
  • Ontario
  • Protein Tyrosine Phosphatase, Non-Receptor Type 22
  • Protein Tyrosine Phosphatases / genetics*
  • Risk
  • Tryptophan
  • Tumor Suppressor Protein p53 / genetics*
  • White People / genetics


  • TP53 protein, human
  • Tumor Suppressor Protein p53
  • Tryptophan
  • Arginine
  • PTPN22 protein, human
  • Protein Tyrosine Phosphatase, Non-Receptor Type 22
  • Protein Tyrosine Phosphatases