Title |
Alternative splicing of G6PC2, the gene coding for the islet-specific glucose-6-phosphatase catalytic subunit-related protein (IGRP), results in differential expression in human thymus and spleen compared with pancreas
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Published in |
Diabetologia, March 2006
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DOI | 10.1007/s00125-006-0185-8 |
Pubmed ID | |
Authors |
R. S. Dogra, P. Vaidyanathan, K. R. Prabakar, K. E. Marshall, J. C. Hutton, A. Pugliese |
Abstract |
Autoimmunity to insulin, glutamic acid decarboxylase and the tyrosine-phosphatase-like protein IA-2 is associated with type 1 diabetes. The production of self-molecules in thymus and secondary lymphoid tissues is critical for self-tolerance; reduced levels may impair tolerance and predispose to autoimmunity, as shown for insulin. Alternative splicing causes differential expression of IA-2 gene (PTPRN) transcripts and IA-2 protein in human thymus and spleen compared with pancreas. IA-2 sequences not present in lymphoid tissues become autoimmune targets in type 1 diabetes. The beta cell molecule islet-specific glucose-6-phosphatase catalytic subunit-related protein (IGRP) is an autoantigen in the non-obese diabetic (NOD) mouse, a model of type 1 diabetes. IGRP is a candidate autoantigen in the human disease, but robust assays for IGRP autoantibodies and/or autoreactive T cells are not available. Both full-length and IGRP splice variants encoded by the G6PC2 gene are expressed in the pancreas. In this study we tested the hypothesis that IGRP splice variants could be differentially expressed in thymus and spleen compared with the pancreas. |
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