University of Cagliari
Autoimmune-associated lymphoid tyrosine phosphatase is a gain-of-function variant
ORRU', VALERIA;ZAVATTARI, PATRIZIA;
2005-01-01
Abstract
A SNP in the gene PTPN22 is associated with type 1 diabetes, rheumatoid arthritis, lupus, Graves thyroiditis, Addison disease and other autoimmune disorders. T cells from carriers of the predisposing allele produce less interleukin-2 upon TCR stimulation, and the encoded phosphatase has higher catalytic activity and is a more potent negative regulator of T lymphocyte activation. We conclude that the autoimmune-predisposing allele is a gain-of-function mutant.
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