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[Recent Advances in α-dystroglycanopathy].

Atsushi Kuga1, Motoi Kanagawa, Tatsushi Toda

  • 1Division of Neurology/Molecular Brain Science, Kobe University Graduate School of Medicine, Kobe-city, Hyogo, Japan.

Brain and Nerve = Shinkei Kenkyu No Shinpo
|November 10, 2011
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Alpha-dystroglycanopathies are a group of genetic disorders affecting muscle, brain, and eye development due to aberrant protein glycosylation. Research is expanding the clinical spectrum and exploring new therapeutic avenues like antisense oligonucleotide therapy for Fukuyama-type congenital muscular dystrophy.

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Area of Science:

  • Biochemistry
  • Genetics
  • Neurology

Background:

  • Fukuyama-type congenital muscular dystrophy (FCMD), muscle-eye-brain disease (MEB), and Walker-Warburg syndrome (WWS) are linked by aberrant glycosylation of alpha-dystroglycan (α-DG).
  • This common pathomechanism underlies a spectrum of muscular dystrophies, now collectively termed 'alpha-dystroglycanopathies'.
  • α-DG's laminin-binding activity is crucial for tissue integrity and is impaired by defective glycosylation.

Purpose of the Study:

  • To review the history of basic and clinical research on alpha-dystroglycanopathies.
  • To refine and broaden the understanding of the clinical spectrum of these disorders.
  • To present recent advancements, including novel disease mechanisms and therapeutic strategies.

Main Methods:

  • Review of existing literature on genetic and glycobiological evidence.
  • Analysis of genotype-phenotype correlations in alpha-dystroglycanopathies.
  • Discussion of enzymatic pathways involved in α-DG glycosylation.

Main Results:

  • Aberrant glycosylation of α-DG is a unifying feature across various muscular dystrophies.
  • Specific O-mannosyl tetrasaccharides and phosphodiester-linked structures on α-DG are vital for laminin binding.
  • Mutations in genes like POMT1/2, POMGnT1, fukutin, and LARGE disrupt these critical glycosylation steps.

Conclusions:

  • The term 'alpha-dystroglycanopathy' effectively unifies diverse disorders with a shared molecular defect.
  • The clinical spectrum of alpha-dystroglycanopathies is broader than previously recognized.
  • Emerging research offers insights into novel disease mechanisms and potential therapies, such as antisense oligonucleotide treatment for FCMD.