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Article Dans Une Revue Human Mutation Année : 2012

Rescue of Sarcoglycan Mutations by Inhibition of Endoplasmic Reticulum Quality Control is Associated with Minimal Structural Modifications

Tayebeh Soheili
  • Fonction : Auteur
Evelyne Gicquel
Jérôme Poupiot
  • Fonction : Auteur
Luu N'Guyen
  • Fonction : Auteur
Florence Le Roy
  • Fonction : Auteur
Marc Bartoli
Isabelle Richard

Résumé

Sarcoglycanopathies (SGP) are a group of autosomal recessive muscle disorders caused by primary mutations in one of the four sarcoglycan genes. The sarcoglycans (alpha-, beta-, gamma-, and delta-sarcoglycan) form a tetrameric complex at the muscle membrane that is part of the dystrophin-glycoprotein complex and plays an essential role for membrane integrity during muscle contractions. We previously showed that the most frequent missense mutation in alpha-sarcoglycan (p.R77C) leads to the absence of the protein at the cell membrane due to its blockade by the endoplasmic reticulum (ER) quality control. Moreover, we demonstrated that inhibition of the ER alpha-mannosidase I activity using kifunensine could rescue the mutant protein localization at the cell membrane. Here, we investigate 25 additional disease-causing missense mutations in the sarcoglycan genes with respect to intracellular fate and localization rescue of the mutated proteins by kifunensine. Our studies demonstrate that, similarly to p.R77C, 22 of 25 of the selected mutations lead to defective intracellular trafficking of the SGs proteins. Six of these were saved from ER retention upon kifunensine treatment. The trafficking of SGs mutants rescued by kifunensine was associated with mutations that have moderate structural impact on the protein. Hum Mutat 33:429-439, 2012. (C) 2011 Wiley Periodicals, Inc.

Dates et versions

hal-01610024 , version 1 (04-10-2017)

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Citer

Tayebeh Soheili, Evelyne Gicquel, Jérôme Poupiot, Luu N'Guyen, Florence Le Roy, et al.. Rescue of Sarcoglycan Mutations by Inhibition of Endoplasmic Reticulum Quality Control is Associated with Minimal Structural Modifications. Human Mutation, 2012, 33 (2), pp.429-439. ⟨10.1002/humu.21659⟩. ⟨hal-01610024⟩

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