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Human Molecular Genetics, Vol 5, 1841-1847, Copyright © 1996 by Oxford University Press

ARTICLES

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

EM McNally, D Duggan, JR Gorospe, CG Bonnemann, M Fanin, E Pegoraro, HG Lidov, S Noguchi, E Ozawa, RS Finkel, RP Cruse, C Angelini, LM Kunkel and EP Hoffman
Division of Genetics, Children's Hospital, Boston, MA 02115, USA.

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 gamma-sarcoglycan in a number of Tunisian muscular dystrophy patients. To investigate whether gamma-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 alpha-sarcoglycan. Four patients with a severe muscular dystrophy phenotype were identified with homozygous, frameshifting mutations in gamma-sarcoglycan. Two of the four have microdeletions that disrupt the distal carboxyl-terminus of gamma- sarcoglycan yet result in a complete absence of gamma-and beta- sarcoglycan suggesting the importance of this region for stability of the sarcoglycan complex. This region of gamma-sarcoglycan, like beta- sarcoglycan, has a number of cysteine residues similar to those in epidermal growth factor cysteine-rich regions.
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