Cited by 56Muscle Physiology and DisordersCardiomyopathy and Myosin StudiesNeurogenetic and Muscular Disorders Research

The DOI matches its Crossref record; 30 of the 30 references it cites were found in a registry or an index.

Overexpression of γ-Sarcoglycan Induces Severe Muscular Dystrophy

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Abstract

The sarcoglycan complex is found normally at the plasma membrane of muscle. Disruption of the sarcoglycan complex, through primary gene mutations in dystrophin or sarcoglycan subunits, produces membrane instability and muscular dystrophy. Restoration of the sarcoglycan complex at the plasma membrane requires reintroduction of the mutant sarcoglycan subunit in a manner that will permit normal assembly of the entire sarcoglycan complex. To study sarcoglycan gene replacement, we introduced transgenes expressing murine gamma-sarcoglycan into muscle of normal mice. Mice expressing high levels of gamma-sarcoglycan, under the control of the muscle-specific creatine kinase promoter, developed a severe muscular dystrophy with greatly reduced muscle mass and early lethality. Marked gamma-sarcoglycan overexpression produced cytoplasmic aggregates that interfered with normal membrane targeting of gamma-sarcoglycan. Overexpression of gamma-sarcoglycan lead to the up-regulation of alpha- and beta-sarcoglycan. These data suggest that increased gamma-sarcoglycan and/or mislocalization of gamma-sarcoglycan to the cytoplasm is sufficient to induce muscle damage and provides a new model of muscular dystrophy that highlights the importance of this protein in the assembly, function, and downstream signaling of the sarcoglycan complex. Most importantly, gene dosage and promoter strength should be given serious consideration in replacement gene therapy to ensure safety in human clinical trials.

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Crossref · 10.1074/jbc.m101877200

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  • Increased levels of some proteins have been reported to cause myopathic symptoms, as shown in transgenic mouse lines overexpressing caveolin-3 or gamma-sarcoglycan.

    “Increased levels of some proteins have been reported to cause myopathic symptoms, as has been shown in work involving transgenic mouse lines that overexpress either caveolin-3 (Galbiati et al. 2000) or g -sarcoglycan (Zhu et al. 2001).”

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Metadata

Authors
Zhu, X., Hadhazy, M., Groh, M. E., Wheeler, M. T., Wollmann, R., & McNally, E. M.
Affiliations
University of Chicago (US)
Corresponding author
McNally, Elizabeth M.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2001-06
Volume
276
Issue
24
Pages
21785-21790
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2069791967
Cited by
56
References
30
Citations by year
2023: 3 · 2019: 1 · 2018: 1 · 2017: 1 · 2016: 1 · 2015: 6 · 2014: 2 · 2013: 2
FWCI
2.10
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • Muscular Dystrophy Association (HL61322)
  • National Institutes of Health (5f32hl010288-02)
  • National Heart, Lung, and Blood Institute (HL 61322, R01HL061322, HL10288)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiomyopathy and Myosin Studies
  • Health Sciences › Medicine › Genetics (clinical) › Neurogenetic and Muscular Disorders Research
Keywords
gamma-sarcoglycan, sarcoglycan complex, muscular dystrophy, gene overexpression, gene replacement therapy, transgenic mice, cytoplasmic aggregates, alpha-sarcoglycan, beta-sarcoglycan, gene dosage, membrane targeting, dystrophin
MeSH terms
Animals, Cattle, Cytoskeletal Proteins, Gene Expression Regulation, Membrane Glycoproteins, Mice, Transgenic, Muscular Dystrophy, Animal, Mutation, Myocardium, Dystrophin, Muscle, Skeletal, Muscle Fibers, Fast-Twitch, Dystroglycans, Sarcoglycans, Mice

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