Diabetes 51:2012-2017, 2002
© 2002 by the American Diabetes Association, Inc.
The Gene INPPL1, Encoding the Lipid Phosphatase SHIP2, Is a Candidate for Type 2 Diabetes In Rat and Man
Evelyne Marion1,
Pamela Jane Kaisaki2,
Valérie Pouillon1,
Cyril Gueydan3,
Jonathan C. Levy4,
André Bodson5,
Georges Krzentowski5,
Jean-Claude Daubresse6,
Jean Mockel7,
Jens Behrends8,
Geneviève Servais9,
Claude Szpirer10,
Véronique Kruys3,
Dominique Gauguier2, and
Stéphane Schurmans1
1 IRIBHM (Institut de Recherches en Biologie Humaine et Moléculaire), IBMM (Institut de Biologie et de Médecine Moléculaires), ULB (Université Libre de Bruxelles), Gosselies, Belgium
2 Wellcome Trust Centre for Human Genetics, University of Oxford, Headington, U.K.
3 Laboratoire de Chimie Biologique, IBMM, ULB, Gosselies, Belgium
4 Diabetes Research Laboratories, University of Oxford, Headington, U.K.
5 Department of Internal Medicine, Endocrinology-Diabetology, C.H.U. (Centre Hospitalier Universitaire) de Charleroi, site de Jumet, Jumet, Belgium
6 Department of Internal Medicine, Endocrinology-Diabetology, C.H.U. de Charleroi, Charleroi, Belgium
7 Department of Endocrinology, Hopital Erasme, ULB, Brussels, Belgium
8 Department of Clinical Endocrinology, Medical School Hannover, Germany
9 Department of Immunology, C.H.U. Brugmann-Huderf, ULB, Brussels, Belgium
10 Laboratoire de Biologie du Développement, IBMM, ULB, Gosselies, Belgium
Genetic susceptibility to type 2 diabetes involves many genes, most of which are still unknown. The lipid phosphatase SHIP2 is a potent negative regulator of insulin signaling and sensitivity in vivo and is thus a good candidate gene. Here we report the presence of SHIP2 gene mutations associated with type 2 diabetes in rats and humans. The R1142C mutation specifically identified in Goto-Kakizaki (GK) and spontaneously hypertensive rat strains disrupts a potential class II ligand for Src homology (SH)-3 domain and slightly impairs insulin signaling in cell culture. In humans, a deletion identified in the SHIP2 3' untranslated region (UTR) of type 2 diabetic subjects includes a motif implicated in the control of protein synthesis. In cell culture, the deletion results in reporter messenger RNA and protein overexpression. Finally, genotyping of a cohort of type 2 diabetic and control subjects showed a significant association between the deletion and type 2 diabetes. Altogether, our results show that mutations in the SHIP2 gene contribute to the genetic susceptibility to type 2 diabetes in rats and humans.

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Copyright © 2002 by the American Diabetes Association.
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