A POGLUT 1 mutation causes a muscular dystrophy with reduced Notch signaling and satellite cell loss

Skeletal muscle regeneration by muscle satellite cells is a physiological mechanism activated upon muscle damage and regulated by Notch signaling. In a family with autosomal recessive limb‐girdle muscular dystrophy, we identified a missense mutation in POGLUT1 (protein O‐glucosyltransferase 1), an e...

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Published in:EMBO molecular medicine 2016-11, Vol.8 (11), p.1289-1309
Main Authors: Servián‐Morilla, Emilia, Takeuchi, Hideyuki, Lee, Tom V, Clarimon, Jordi, Mavillard, Fabiola, Area‐Gómez, Estela, Rivas, Eloy, Nieto‐González, Jose L, Rivero, Maria C, Cabrera‐Serrano, Macarena, Gómez‐Sánchez, Leonardo, Martínez‐López, Jose A, Estrada, Beatriz, Márquez, Celedonio, Morgado, Yolanda, Suárez‐Calvet, Xavier, Pita, Guillermo, Bigot, Anne, Gallardo, Eduard, Fernández‐Chacón, Rafael, Hirano, Michio, Haltiwanger, Robert S, Jafar‐Nejad, Hamed, Paradas, Carmen
Format: Article
Language:English
Subjects:
Cell proliferation
Defects
Dystroglycan
Extracellular matrix
Fibroblasts
Genes
Glucosyltransferase
Insects
Missense mutation
Muscular dystrophy
Musculoskeletal system
Mutation
Myoblasts
Myogenesis
Patients
Proteins
Satellite cells
Skeletal muscle
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Summary:Skeletal muscle regeneration by muscle satellite cells is a physiological mechanism activated upon muscle damage and regulated by Notch signaling. In a family with autosomal recessive limb‐girdle muscular dystrophy, we identified a missense mutation in POGLUT1 (protein O‐glucosyltransferase 1), an enzyme involved in Notch posttranslational modification and function. In vitro and in vivo experiments demonstrated that the mutation reduces O‐glucosyltransferase activity on Notch and impairs muscle development. Muscles from patients revealed decreased Notch signaling, dramatic reduction in satellite cell pool and a muscle‐specific α‐dystroglycan hypoglycosylation not present in patients' fibroblasts. Primary myoblasts from patients showed slow proliferation, facilitated differentiation, and a decreased pool of quiescent PAX7+ cells. A robust rescue of the myogenesis was demonstrated by increasing Notch signaling. None of these alterations were found in muscles from secondary dystroglycanopathy patients. These data suggest that a key pathomechanism for this novel form of muscular dystrophy is Notch‐dependent loss of satellite cells.
ISSN:1757-4676
1757-4684
DOI:10.15252/emmm.201505815