title: Muscle dysfunction caused by loss of Magel2 in a mouse model of Prader-Willi and Schaaf-Yang syndromes.
abstract: Prader-Willi syndrome is characterized by severe hypotonia in infancy, with decreased lean mass and increased fat mass in childhood followed by severe hyperphagia and consequent obesity. Scoliosis and other orthopaedic manifestations of hypotonia are common in children with Prader-Willi syndrome and cause significant morbidity. The relationships among hypotonia, reduced muscle mass and scoliosis have been difficult to establish. Inactivating mutations in one Prader-Willi syndrome candidate gene, MAGEL2, cause a Prader-Willi-like syndrome called Schaaf-Yang syndrome, highlighting the importance of loss of MAGEL2 in Prader-Willi syndrome phenotypes. Gene-targeted mice lacking Magel2 have excess fat and decreased muscle, recapitulating altered body composition in Prader-Willi syndrome. We now demonstrate that Magel2 is expressed in the developing musculoskeletal system, and that loss of Magel2 causes muscle-related phenotypes in mice consistent with atrophy caused by altered autophagy. Magel2-null mice serve as a preclinical model for therapies targeting muscle structure and function in children lacking MAGEL2 diagnosed with Prader-Willi or Schaaf-Yang syndrome.
authors.affiliation: Department of Medical Genetics.
authors.forename: Ain A
authors.initials: AA
authors.lastname: Kamaludin
authors.affiliation: Department of Medical Genetics.
authors.forename: Christa
authors.initials: C
authors.lastname: Smolarchuk
authors.affiliation: Department of Medical Genetics.
authors.forename: Jocelyn M
authors.initials: JM
authors.lastname: Bischof
authors.affiliation: Department of Medical Genetics.
authors.forename: Rachelle
authors.initials: R
authors.lastname: Eggert
authors.affiliation: Department of Physiology, University of Alberta, Edmonton, AB, Canada.
authors.forename: John J
authors.initials: JJ
authors.lastname: Greer
authors.affiliation: Department of Physiology, University of Alberta, Edmonton, AB, Canada.
authors.forename: Jun
authors.initials: J
authors.lastname: Ren
authors.affiliation: Department of Medical Genetics.
authors.forename: Joshua J
authors.initials: JJ
authors.lastname: Lee
authors.affiliation: Department of Medical Genetics.
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Yokota
authors.affiliation: Department of Medical Genetics.|Department of Surgery and.
authors.forename: Fred B
authors.initials: FB
authors.lastname: Berry
authors.affiliation: Department of Medical Genetics rwevrick@ualberta.ca.
authors.forename: Rachel
authors.initials: R
authors.lastname: Wevrick
mesh_terms: D000818:Animals; D000951:Antigens, Neoplasm / Q000235:genetics* / Q000378:metabolism; D001343:Autophagy; D004195:Disease Models, Animal; D006801:Humans; D051379:Mice; D018345:Mice, Knockout; D018482:Muscle, Skeletal / Q000196:embryology / Q000378:metabolism / Q000473:pathology*; D011218:Prader-Willi Syndrome / Q000235:genetics / Q000473:pathology*; D011506:Proteins / Q000235:genetics* / Q000378:metabolism; D047908:Intracellular Signaling Peptides and Proteins; D064267:Intrinsically Disordered Proteins
chemical_list: D000951:Antigens, Neoplasm; D011506:Proteins; C403091:Magel2 protein, mouse; D047908:Intracellular Signaling Peptides and Proteins; D064267:Intrinsically Disordered Proteins