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First single gene mutation shown to result in type 1 diabetes
Date:3/5/2013

New York, NY, March 5, 2013 A JDRF-funded study out of Switzerland has shown that a single gene called SIRT1 may be involved in the development of type 1 diabetes (T1D) and other autoimmune diseases. The study, "Identification of a SIRT1 Mutation in a Family with Type 1 Diabetes," was published today in Cell Metabolism and represents the first demonstration of a monogenetic defect leading to the onset of T1D.

The research began when Marc Donath, M.D., endocrinologist and researcher at the University Hospital Basel in Switzerland, discovered an interesting pattern of autoimmune disease within the family of one of his patients, a 26-year-old male who had recently been diagnosed with T1D. The patient showed an uncommonly strong family history of T1D; his sister, father, and paternal cousin had also been diagnosed earlier in their lives. Additionally, another family member had developed ulcerative colitis, also an autoimmune disease.

"This pattern of inheritance was indicative of dominant genetic mutation, and we therefore decided to attempt to identify it," Dr. Donath said.

Four years of analysis using three different genotyping and sequencing techniques pointed to a mutation on the SIRT1 gene as the common indicator of autoimmune disease within the family. The SIRT1 gene plays a role in regulating metabolism and protecting against age-related disease. To gain more understanding of how this genetic change in SIRT1 leads to T1D, Dr. Donath and his team performed additional studies with animal models of T1D. When the mutant SIRT1 gene found in the families was expressed in beta cells, those beta cells generated more mediators that were destructive to them. Furthermore, knocking out the normal SIRT1 gene in mice resulted in their becoming more susceptible to diabetes with greatly increased islet destruction. Dr. Donath speculates that the beta cell impairment and death due to the SIRT1 mutation subsequently activates the immune syst
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Contact: Tara Wilcox-Ghanoonparvar
twilcox-ghanoonparvar@jdrf.org
212-479-7524
JDRF
Source:Eurekalert

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