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Gene expression during normal and FSHD myogenesis.

Koji Tsumagari1, Shao-Chi Chang, Michelle Lacey

  • 1Human Genetics Program, Tulane Medical School, New Orleans, LA, USA.

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|September 29, 2011
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Facioscapulohumeral muscular dystrophy (FSHD) involves DUX4 gene expression changes. This study reveals that FSHD pathogenesis may stem from early, transient DUX4 effects, not late-stage toxicity in muscle cells.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Biochemistry

Background:

  • Facioscapulohumeral muscular dystrophy (FSHD) is a dominant genetic disorder.
  • It is associated with a contraction of D4Z4 repeats at 4q35, containing the DUX4 gene.
  • The precise mechanism by which DUX4 contributes to FSHD pathogenesis remains unclear.

Purpose of the Study:

  • To investigate gene expression profiles in FSHD.
  • To understand the role of DUX4 in FSHD pathogenesis.
  • To compare gene expression in FSHD and control myogenic cells.

Main Methods:

  • Exon-based microarrays were used to analyze gene expression.
  • Myogenic precursor cells (myoblasts and myotubes) from FSHD patients and controls were studied.
  • Expression profiles were compared to 19 non-muscle cell types.

Main Results:

  • Significant differential gene expression was observed in FSHD myogenic cells compared to controls.
  • FSHD showed dampened myogenesis-specific gene expression, affecting muscle structure, mitochondrial function, and signaling.
  • DUX4 RNA was detected at very low levels in FSHD myoblasts and myotubes.

Conclusions:

  • DUX4's pathogenic effect in FSHD may occur transiently during early myoblast formation.
  • This early effect could initiate a cascade of gene dysregulation.
  • This model explains low DUX4 detectability in later muscle cell stages despite its link to FSHD.