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© 1994 Oxford University Press

RESEARCH-ARTICLE

Prevention of dystrophic pathology in mdx mice by a truncated dystrophin isoform

Jill A. Rafael1, Yoshihide Sunada4, Neil M. Cole3, Kevin P. Campbell4, John A. Faulkner3 and Jeffrey S. Chamberlain1,2,*

1Department of Human Genetics, Institute of Gerontology, University of Michigan Medical School Ann Arbor, MI 48109 2Human Genome Center, Institute of Gerontology, University of Michigan Medical School Ann Arbor, MI 48109 3Department of Physiology and Institute of Gerontology, University of Michigan Medical School Ann Arbor, MI 48109 4Department of Physiology and Biophysics, Howard Hughes Medical Institute, University of lowa College of Medicine lowa City, IA 52242. USA

*To whom correspondence should be addressed

Received June 3, 1994; Revised August 5, 1994; Accepted August 5, 1994

The C-terminal domain of dystrophin is alternatively spliced to produce a variety of tissue and developmental stage-specific isoforms. Recent studies suggest that the C-terminal domain binds to the dystrophin-associated glycoprotein complex (DGC) in muscle, but little is known about the functional significance of the alternative splicing or what role individual isoforms may play in specific tissues. The major dystrophin transcript in brain lacks exons 71–74, and encodes an isoform not observed in skeletal muscle. To explore the capacity of this truncated isoform to function in muscle, we have generated transgenic mice expressing a murine dystrophin mini-gene missing exons 71–74. Uniform expression of this construct on a mutant mdx mouse background results in normal muscle morphology and physiology, and prevents the development of muscular dystrophy. These mice also display normal expression and localization of the DGC, suggesting that the alternatively spliced exons are not required for dystrophin function in skeletal muscle. An additional line of mice was analyzed that had a mosaic pattern of expression. These mice display a markedly milder phenotype than mdx mice, despite the expression of dystrophin in only half the muscle fibers. These results indicate that viral delivery of dystrophin to a simple majority of fibers in a muscle group would greatly reduce the dystrophic pathology associated with Duchenne muscular dystrophy.


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