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J. Cell Biol., Volume 142, Number 6, September 21, 1998 1461-1471

Progressive Muscular Dystrophy in alpha -Sarcoglycan-deficient Mice

Franck Duclos,* Volker Straub,* Steven A. Moore,Dagger David P. Venzke,* Ron F. Hrstka,§ Rachelle H. Crosbie,* Madeleine Durbeej,* Connie S. Lebakken,* Audrey J. Ettinger,parallel Jack van der Meulen,** Kathleen H. Holt,* Leland E. Lim,* Joshua R. Sanes,parallel Beverly L. Davidson, John A. Faulkner,** Roger Williamson,§ and Kevin P. Campbell*

* Howard Hughes Medical Institute, Department of Physiology and Biophysics and Department of Neurology, University of Iowa College of Medicine, Iowa City, Iowa 52242-1101; Dagger  Department of Pathology and § Department of Obstetrics and Gynecology, University of Iowa College of Medicine, Iowa City, Iowa 52242; parallel   Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri 63110;  Department of Internal Medicine, University of Iowa College of Medicine, Iowa City, Iowa 52242; and ** Institute of Gerontology, University of Michigan, Ann Arbor, Michigan 48109

Limb-girdle muscular dystrophy type 2D (LGMD 2D) is an autosomal recessive disorder caused by mutations in the alpha -sarcoglycan gene. To determine how alpha -sarcoglycan deficiency leads to muscle fiber degeneration, we generated and analyzed alpha -sarcoglycan- deficient mice. Sgca-null mice developed progressive muscular dystrophy and, in contrast to other animal models for muscular dystrophy, showed ongoing muscle necrosis with age, a hallmark of the human disease. Sgca-null mice also revealed loss of sarcolemmal integrity, elevated serum levels of muscle enzymes, increased muscle masses, and changes in the generation of absolute force. Molecular analysis of Sgca-null mice demonstrated that the absence of alpha -sarcoglycan resulted in the complete loss of the sarcoglycan complex, sarcospan, and a disruption of alpha -dystroglycan association with membranes. In contrast, no change in the expression of epsilon -sarcoglycan (alpha -sarcoglycan homologue) was observed. Recombinant alpha -sarcoglycan adenovirus injection into Sgca-deficient muscles restored the sarcoglycan complex and sarcospan to the membrane. We propose that the sarcoglycan-sarcospan complex is requisite for stable association of alpha -dystroglycan with the sarcolemma. The Sgca-deficient mice will be a valuable model for elucidating the pathogenesis of sarcoglycan deficient limb-girdle muscular dystrophies and for the development of therapeutic strategies for this disease.

Key words: gene targetingmuscular dystrophysarcoglycandystroglycansarcospan


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