title: Generalized glycogen storage and cardiomegaly in a knockout mouse model of Pompe disease.
abstract: Glycogen storage disease type II (GSDII; Pompe disease), caused by inherited deficiency of acid alpha-glucosidase, is a lysosomal disorder affecting heart and skeletal muscles. A mouse model of this disease was obtained by targeted disruption of the murine acid alpha-glucosidase gene (Gaa) in embryonic stem cells. Homozygous knockout mice (Gaa -/-) lack Gaa mRNA and have a virtually complete acid alpha-glucosidase deficiency. Glycogen-containing lysosomes are detected soon after birth in liver, heart and skeletal muscle cells. By 13 weeks of age, large focal deposits of glycogen have formed. Vacuolar spaces stain positive for acid phosphatase as a sign of lysosomal pathology. Both male and female knockout mice are fertile and can be intercrossed to produce progeny. The first born knockout mice are at present 9 months old. Overt clinical symptoms are still absent, but the heart is typically enlarged and the electrocardiogram is abnormal. The mouse model will help greatly to understand the pathogenic mechanism of GSDII and is a valuable instrument to explore the efficacy of different therapeutic interventions.
authors.affiliation: Department of Clinical Genetics, Erasmus University, P.O. Box 1738, 3000 DR Rotterdam, The Netherlands.
authors.forename: A G
authors.initials: AG
authors.lastname: Bijvoet
authors.forename: E H
authors.initials: EH
authors.lastname: van de Kamp
authors.forename: M A
authors.initials: MA
authors.lastname: Kroos
authors.forename: J H
authors.initials: JH
authors.lastname: Ding
authors.forename: B Z
authors.initials: BZ
authors.lastname: Yang
authors.forename: P
authors.initials: P
authors.lastname: Visser
authors.forename: C E
authors.initials: CE
authors.lastname: Bakker
authors.forename: M P
authors.initials: MP
authors.lastname: Verbeet
authors.forename: B A
authors.initials: BA
authors.lastname: Oostra
authors.forename: A J
authors.initials: AJ
authors.lastname: Reuser
authors.forename: A T
authors.initials: AT
authors.lastname: van der Ploeg
mesh_terms: D000818:Animals; D006332:Cardiomegaly / Q000235:genetics / Q000378:metabolism* / Q000503:physiopathology; D004195:Disease Models, Animal; D005260:Female; D006003:Glycogen / Q000378:metabolism*; D006009:Glycogen Storage Disease Type II / Q000235:genetics / Q000378:metabolism* / Q000503:physiopathology*; D008297:Male; D051379:Mice; D018345:Mice, Knockout; D000520:alpha-Glucosidases / Q000172:deficiency* / Q000235:genetics
chemical_list: D006003:Glycogen; D000520:alpha-Glucosidases