Human Molecular Genetics, 2002, Vol. 11, No. 18 2155-2164
© 2002 Oxford University Press
Sustained hepatic and renal glucose-6-phosphatase expression corrects glycogen storage disease type Ia in mice
1Section on Cellular Differentiation, Heritable Disorders Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA, 2Veterinary and Tumor Pathology Section, Office of Laboratory Animal Science, National Cancer Institute, Frederick, MD 21702, USA and 3Powell Gene Therapy Center and Department of Pediatrics and Molecular Genetics & Microbiology, University of Florida, Gainesville, FL 32610, USA
Received May 3, 2002; Revised June 28, 2002; Accepted June 28, 2002
Deficiency of glucose-6-phosphatase (G6Pase), a key enzyme in glucose homeostasis, causes glycogen storage disease type Ia (GSD-Ia), an autosomal recessive disorder characterized by growth retardation, hypoglycemia, hepatomegaly, nephromegaly, hyperlipidemia, hyperuricemia, and lactic acidemia. G6Pase is an endoplasmic reticulum-associated transmembrane protein expressed primarily in the liver and the kidney. Therefore, enzyme replacement therapy is not feasible using current strategies, but somatic gene therapy, targeting G6Pase to the liver and the kidney, is an attractive possibility. Previously, we reported the development of a mouse model of G6Pase deficiency that closely mimics human GSD-Ia. Using neonatal GSD-Ia mice, we now demonstrate that a combined adeno virus and adeno-associated virus vector-mediated gene transfer leads to sustained G6Pase expression in both the liver and the kidney and corrects the murine GSD-Ia disease for at least 12 months. Our results suggest that human GSD-Ia would be treatable by gene therapy.
* To whom correspondence should be addressed at: Building 10, Room 9S241, NIH, 9000 Rockville Pike, Bethesda, MD 20892-1830, USA. Tel: +1 3014961094; Fax: +1 3014026035; Email: chou{at}helix.nih.gov
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