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Träfflista för sökning "WFRF:(Thornell Lars Eric) ;pers:(Oldfors Anders 1951)"

Sökning: WFRF:(Thornell Lars Eric) > Oldfors Anders 1951

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  • Tajsharghi, Homa, 1968, et al. (författare)
  • Myosin heavy chain IIa gene mutation E706K is pathogenic and its expression increases with age.
  • 2002
  • Ingår i: Neurology. - : Lippincott Williams & Wilkins. - 0028-3878 .- 1526-632X. ; 58:5, s. 780-6
  • Tidskriftsartikel (refereegranskat)abstract
    • BACKGROUND: The authors recently described a new autosomal dominant myopathy (OMIM 605637 inclusion body myopathy 3) associated with a missense mutation in the myosin heavy chain (MyHC) IIa gene (MyHC IIa, Human Gene Map [HGM] locus MYH2). Young patients showed minor changes in their muscle biopsies, although dystrophic alterations and rimmed vacuoles with 15- to 20-nm tubulofilaments identical to those in sporadic inclusion body myositis (s-IBM) were observed in some of the adult (especially older) patients. The current study was undertaken to investigate the relation between expression of the mutant MyHC IIa and pathologic changes in muscle. METHODS: The expression of MyHC IIa in nine muscle specimens from six individuals carrying the mutation was analyzed by immunohistochemistry, sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and a new reverse transcriptase--PCR method to measure the relative abundance of the various MyHC transcripts. RESULTS: Young patients with muscle weakness and minor pathologic changes in muscle expressed MyHC IIa at undetectable levels. MyHC IIa was expressed at high levels in adults with a progressive clinical course and dystrophic muscle changes. In these cases, a large number of muscle fibers were hybrids with expression of more than one MyHC isoform. Both MyHC IIa alleles were equally expressed. The relative level of MyHC IIa transcripts exceeded that of the corresponding protein, indicating an increased turnover of mutated protein. MyHC IIa expression was a consistent finding in muscle fibers with rimmed vacuoles. CONCLUSIONS: The clear correlation between pathologic changes and expression of MyHC IIa indicates that defects in MyHC may lead not only to muscle weakness but also to muscle degeneration. The consistent expression of MyHC IIa in muscle fibers with rimmed vacuoles indicates that the breakdown of sarcomeric proteins is a key element in the pathogenesis of rimmed vacuoles of s-IBM type.
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3.
  • Tajsharghi, Homa, 1968, et al. (författare)
  • Myosin storage myopathy associated with a heterozygous missense mutation in MYH7.
  • 2003
  • Ingår i: Annals of neurology. - : Wiley. - 0364-5134 .- 1531-8249. ; 54:4, s. 494-500
  • Tidskriftsartikel (refereegranskat)abstract
    • Myosin constitutes the major part of the thick filaments in the contractile apparatus of striated muscle. MYH7 encodes the slow/beta-cardiac myosin heavy chain (MyHC), which is the main MyHC isoform in slow, oxidative, type 1 muscle fibers of skeletal muscle. It is also the major MyHC isoform of cardiac ventricles. Numerous missense mutations in the globular head of slow/beta-cardiac MyHC are associated with familial hypertrophic cardiomyopathy. We identified a missense mutation, Arg1845Trp, in the rod region of slow/beta-cardiac MyHC in patients with a skeletal myopathy from two different families. The myopathy was characterized by muscle weakness and wasting with onset in childhood and slow progression, but no overt cardiomyopathy. Slow, oxidative, type 1 muscle fibers showed large inclusions consisting of slow/beta-cardiac MyHC. The features were similar to a previously described entity: hyaline body myopathy. Our findings indicate that the mutated residue of slow/beta-cardiac MyHC is essential for the assembly of thick filaments in skeletal muscle. We propose the term myosin storage myopathy for this disease.
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