Association of the single nucleotide polymorphism C1858T of the PTPN22 gene with type 1 diabetes

Hum Immunol. 2005 Jan;66(1):60-4. doi: 10.1016/j.humimm.2004.09.016.

Abstract

The PTPN22 (protein tyrosine phosphatase N22) gene encodes the protein tyrosine phosphatase Lyp. One function of Lyp is downregulation of T-cell signaling through its interaction with the negative regulatory kinase C-terminal Src tyrosine kinase (Csk). A single nucleotide polymorphism in the PTPN22 gene, C1858T, encodes products with different Csk binding affinities. Disease association of the PTPN22 1858T allele has been reported in case-control studies of three different autoimmune disorders: type 1 diabetes (T1D), rheumatoid arthritis, and systemic lupus erythematosus. In this study, a set of 341 white, multiplex T1D families were genotyped for the C1858T single nucleotide polymorphism of PTPN22, and transmission disequilibrium test analysis revealed significant association (p = 0.005) of the T allele with T1D. No effects of parent of origin, sex of patient, or human leukocyte antigen genotype (high-risk human leukocyte antigen DR3/DR4 vs non-DR3/DR4) were observed. However, transmission of the T allele was significantly increased in the subset of patients who also carried at least one copy of the TCF7 883A allele, another allele that is important in regulating T-cell responses and that is associated with T1D. These results are consistent with the hypothesis that individuals lacking the C allele of PTPN22 may have reduced capacity to downregulate T-cell responses and may therefore be more susceptible to autoimmunity.

Publication types

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

MeSH terms

  • Diabetes Mellitus, Type 1 / etiology
  • Diabetes Mellitus, Type 1 / genetics*
  • Genetic Predisposition to Disease*
  • Humans
  • Polymorphism, Single Nucleotide*
  • Protein Tyrosine Phosphatase, Non-Receptor Type 1
  • Protein Tyrosine Phosphatase, Non-Receptor Type 22
  • Protein Tyrosine Phosphatases / genetics*

Substances

  • PTPN22 protein, human
  • Protein Tyrosine Phosphatase, Non-Receptor Type 1
  • Protein Tyrosine Phosphatase, Non-Receptor Type 22
  • Protein Tyrosine Phosphatases