Protein Tyrosine Phosphatase, Non Receptor Type 22 (PTPN22)

Protein tyrosine phosphatase, non-receptor type 22 (lymphoid) is located on the short arm of Chromosome 1 near the telomere (1p13.2) on the Crick (minus) strand. It is 57,898 bases in length and encodes a protein of 807 amino acids (molecular weight 91,705 Da). There are 24 exons in the gene and 21 transcript variants encoding 10 distinct proteins are known. The proteins are located in the cytoplasm.

This gene encodes a protein tyrosine phosphatase which is expressed primarily in lymphoid tissues. This enzyme associates with the molecular adapter protein CBL and may be involved in regulating CBL function in the T cell receptor signaling pathway.