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Related Experiment Videos

Rewiring enervated: thinking LARGEr than myodystrophy.

Eleni N Levedakou1, Brian Popko

  • 1Department of Neurology, Jack Miller Center for Peripheral Neuropathy, The University of Chicago, Illinois 60637, USA.

Journal of Neuroscience Research
|May 20, 2006
PubMed
Summary

Mutations in the LARGE gene cause muscular dystrophy and affect nerve function. LARGE gene defects highlight the critical role of glycosylation in neuromuscular diseases, with LARGE mouse mutants serving as valuable research models.

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Area of Science:

  • Biochemistry
  • Genetics
  • Neuroscience

Background:

  • The LARGE gene encodes a glycosyltransferase crucial for alpha-dystroglycan glycosylation within the dystrophin-associated glycoprotein complex.
  • Mutations in LARGE lead to muscular dystrophy and associated defects in heart, brain, and eyes.
  • Specific LARGE mutations, like Large(myd) and Large(vls), and transgene disruptions (Large(enr)) cause distinct phenotypes.

Purpose of the Study:

  • To investigate the function of the LARGE gene and its role in neuromuscular disorders.
  • To characterize the peripheral nerve abnormalities observed in the Large(enr) mouse model.
  • To explore the broader implications of LARGE function beyond alpha-dystroglycan glycosylation.

Main Methods:

  • Analysis of spontaneous Large gene deletions (Large(myd), Large(vls)) and transgene integration (Large(enr)) in mouse models.

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  • Phenotypic characterization of muscular dystrophy, heart, brain, and eye defects.
  • Assessment of peripheral nerve abnormalities, including axonal sorting, regeneration capacity, and neuromuscular junction integrity in Large(enr) mice.

    • Main Results:

    • Large(myd) and Large(vls) mutants exhibit muscular dystrophy with multi-systemic defects.
    • Large(enr) mice display myodystrophy alongside peripheral nerve issues such as defective Schwann cells, impaired nerve regeneration, and abnormal neuromuscular junctions.
    • These findings suggest LARGE may act on substrates beyond alpha-dystroglycan.

    Conclusions:

    • LARGE is essential for proper neuromuscular function, impacting both muscle and peripheral nerves.
    • Dysfunctional LARGE glycosylation contributes significantly to the pathogenesis of neuromuscular diseases.
    • LARGE mouse mutants provide critical models for studying glycosylation's role in neuromuscular health and disease.