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Gene expression analyses in X-linked myotubular myopathy
S Noguchi1, M Fujita, K Murayama
1Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry,4-1-1 Ogawahigashi, Kodaira, Tokyo, 187-8502, Japan. noguchi@ncnp.go.jp
Neurology
|September 15, 2005
Summary
X-linked myotubular myopathy (XLMTM) involves muscle weakness due to MTM1 gene mutations. Gene expression analysis reveals that cytoskeletal and extracellular matrix remodeling contributes to muscle fiber atrophy in XLMTM.
Area of Science:
- Genetics
- Molecular Biology
- Neuromuscular Disorders
Background:
- X-linked myotubular myopathy (XLMTM) is a severe congenital muscle disorder.
- It is caused by mutations in the MTM1 gene, affecting the myotubularin protein.
- Myotubularin is implicated in phosphatidylinositol-3-phosphate phosphatase activity and membrane trafficking.
Purpose of the Study:
- To investigate gene expression profiles in skeletal muscles affected by XLMTM.
- To understand the molecular mechanisms underlying muscle pathology in XLMTM.
Main Methods:
- Analysis of over 4,200 genes using custom cDNA microarrays.
- Studied skeletal muscle tissue from eight patients diagnosed with XLMTM.
Main Results:
- Identified significant upregulation of transcripts for cytoskeletal proteins in XLMTM muscles.
- Observed increased expression of extracellular matrix proteins surrounding atrophic myofibers.
- Gene expression patterns are pathognomonic for XLMTM.
Conclusions:
- Muscle fiber atrophy in XLMTM is associated with significant remodeling of the cytoskeleton.
- Changes in extracellular matrix architecture contribute to muscle pathology.
- Intracellular organelle disorganization is a consequence of these architectural changes.