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New genotype-phenotype correlations in a large European cohort of patients with sarcoglycanopathy

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  • Jorge Alonso-Pérez
  • Lidia González-Quereda
  • Luca Bello
  • Michela Guglieri
  • Volker Straub
  • Pia Gallano
  • Claudio Semplicini
  • Elena Pegoraro
  • Vittoria Zangaro
  • Andrés Nascimento
  • Carlos Ortez
  • Giacomo Pietro Comi
  • Leroy Ten Dam
  • Marianne De Visser
  • A J van der Kooi
  • Cristina Garrido
  • Manuela Santos
  • Ulrike Schara
  • Andrea Gangfuß
  • Nicoline Løkken
  • Jesper Helbo Storgaard
  • John Vissing
  • Benedikt Schoser
  • Gabriele Dekomien
  • Bjarne Udd
  • Johanna Palmio
  • Adele D'Amico
  • Luisa Politano
  • Vincenzo Nigro
  • Claudio Bruno
  • Chiara Panicucci
  • Anna Sarkozy
  • Omar Abdel-Mannan
  • Alicia Alonso-Jimenez
  • Kristl G Claeys
  • David Gomez-Andrés
  • Francina Munell
  • Laura Costa-Comellas
  • Jana Haberlová
  • Marie Rohlenová
  • De Vos Elke
  • Jan L De Bleecker
  • Cristina Dominguez-González
  • Giorgio Tasca
  • Claudia Weiss
  • Nicolas Deconinck
  • Roberto Fernández-Torrón
  • Adolfo López de Munain
  • Ana Camacho-Salas
  • Béla Melegh
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Sarcoglycanopathies comprise four subtypes of autosomal recessive limb-girdle muscular dystrophies (LGMDR3, LGMDR4, LGMDR5 and LGMDR6) that are caused, respectively, by mutations in the SGCA, SGCB, SGCG and SGCD genes. In 2016, several clinicians involved in the diagnosis, management and care of patients with LGMDR3-6 created a European Sarcoglycanopathy Consortium. The aim of the present study was to determine the clinical and genetic spectrum of a large cohort of patients with sarcoglycanopathy in Europe. This was an observational retrospective study. A total of 33 neuromuscular centres from 13 different European countries collected data of the genetically confirmed patients with sarcoglycanopathy followed-up at their centres. Demographic, genetic and clinical data were collected for this study. Data from 439 patients from 13 different countries were collected. Forty-three patients were not included in the analysis because of insufficient clinical information available. A total of 159 patients had a confirmed diagnosis of LGMDR3, 73 of LGMDR4, 157 of LGMDR5 and seven of LGMDR6. Patients with LGMDR3 had a later onset and slower progression of the disease. Cardiac involvement was most frequent in LGMDR4. Sixty per cent of LGMDR3 patients carried one of the following mutations, either in a homozygous or heterozygous state: c.229C>T, c.739G>A or c.850C>T. Similarly, the most common mutations in LMGDR5 patients were c.525delT or c.848G>A. In LGMDR4 patients the most frequent mutation was c.341C>T. We identified onset of symptoms before 10 years of age and residual protein expression lower than 30% as independent risk factors for losing ambulation before 18 years of age, in LGMDR3, LGMDR4 and LGMDR5 patients. This study reports clinical, genetic and protein data of a large European cohort of patients with sarcoglycanopathy. Improving our knowledge about these extremely rare autosomal recessive forms of LGMD was helped by a collaborative effort of neuromuscular centres across Europe. Our study provides important data on the genotype-phenotype correlation that is relevant for the design of natural history studies and upcoming interventional trials in sarcoglycanopathies.

Original languageEnglish
JournalBrain
Volume143
Issue number9
Pages (from-to)2696-2708
Number of pages13
ISSN0006-8950
DOIs
Publication statusPublished - 1 Sep 2020

    Research areas

  • Cohort, Limb girdle muscular dystrophies, Registries, Sarcoglycan, Treatment

ID: 61347888