Mutations that disrupt the carboxyl-terminus of γ-sarcoglycan cause muscular dystrophy

Elizabeth M. McNally, David Duggan, J. Rafael Gorospe, Carsten G. Bönnemann, Marina Fanin, Elena Pegoraro, Hart G W Lidov, Satoru Noguchi, Eijiro Ozawa, Richard S. Finkel, Robert P. Cruse, Corrado Angelini, Louis M. Kunkel*, Eric P. Hoffman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

133 Scopus citations

Abstract

Recently, mutations in the genes encoding several of the dystrophin-associated proteins have been identified that produce phenotypes ranging from severe Duchenne-like autosomal recessive muscular dystrophy to the milder limb-girdle muscular dystrophies (LGMDs). LGMD type 2C is generally associated with a more severe clinical course and is prevalent in northern Africa. A previous study identified a single base pair deletion in the gene encoding the dystrophin-associated protein γ-sarcoglycan in a number of Tunisian muscular dystrophy patients. To investigate whether γ-sarcoglycan gene mutations cause autosomal recessive muscular dystrophy in other populations, we studied 50 muscular dystrophy patients from the United States and Italy. The muscle biopsies from these 50 patients showed no abnormality of dystrophin but did show diminished immunostaining for the dystrophin-associated protein α-sarcoglycan. Four patients with a severe muscular dystrophy phenotype were identified with homozygous, frameshifting mutations in γ-sarcoglycan. Two of the four have microdeletions that disrupt the distal carboxyl-terminus of γ-sarcoglycan yet result in a complete absence of γ- and β-sarcoglycan suggesting the importance of this region for stability of the sarcoglycan complex. This region of γ-sarcoglycan, like β-sarcoglycan, has a number of cysteine residues similar to those in epidermal growth factor cysteine-rich regions.

Original languageEnglish (US)
Pages (from-to)1841-1847
Number of pages7
JournalHuman molecular genetics
Volume5
Issue number11
DOIs
StatePublished - Nov 1996

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Genetics(clinical)

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