Journal
HUMAN MOLECULAR GENETICS
Volume 25, Issue 17, Pages 3798-3809Publisher
OXFORD UNIV PRESS
DOI: 10.1093/hmg/ddw225
Keywords
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Funding
- Scoliosis Research Society
- Foundation for Prader-Willi Research
- Women and Children's Health Research Institute
- University of Alberta Graduate Program in Maternal and Child Health (MatCH)
- Department of Medical Genetics
- Alberta Innovates [201500096] Funding Source: researchfish
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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.
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