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Myosin Storage Myopathy in C. elegans and Human Cultured Muscle Cells
Department of Pathology, University of Gothenburg, Sahlgrenska University Hospital, Gothenburg, Sweden.
Department of Pathology, University of Gothenburg, Sahlgrenska University Hospital, Gothenburg, Sweden.
Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden.
Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden.
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2017 (Engelska)Ingår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 12, nr 1, artikel-id e0170613Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Myosin storage myopathy is a protein aggregate myopathy associated with the characteristic subsarcolemmal accumulation of myosin heavy chain in muscle fibers. Despite similar histological findings, the clinical severity and age of onset are highly variable, ranging from no weakness to severe impairment of ambulation, and usually childhood-onset to onset later in life. Mutations located in the distal end of the tail of slow/beta-cardiac myosin heavy chain are associated with myosin storage myopathy. Four missense mutations (L1793P, R1845W, E1883K and H1901L), two of which have been reported in several unrelated families, are located within or closed to the assembly competence domain. This location is critical for the proper assembly of sarcomeric myosin rod filaments. To assess the mechanisms leading to protein aggregation in myosin storage myopathy and to evaluate the impact of these mutations on myosin assembly and muscle function, we expressed mutated myosin proteins in cultured human muscle cells and in the nematode Caenorhabditis elegans. While L1793P mutant myosin protein efficiently incorporated into the sarcomeric thick filaments, R1845W and H1901L mutants were prone to formation of myosin aggregates without assembly into striated sarcomeric thick filaments in cultured muscle cells. In C. elegans, mutant alleles of the myosin heavy chain gene unc-54 corresponding to R1845W, E1883K and H1901L, were as effective as the wild-type myosin gene in rescuing the null mutant worms, indicating that they retain functionality. Taken together, our results suggest that the basis for the pathogenic effect of the R1845W and H1901L mutations are primarily structural rather than functional. Further analyses are needed to identify the primary trigger for the histological changes seen in muscle biopsies of patients with L1793P and E1883K mutations.

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2017. Vol. 12, nr 1, artikel-id e0170613
Nationell ämneskategori
Medicinsk bioteknologi Medicinska och farmaceutiska grundvetenskaper
Forskningsämne
Translationell medicin TRIM
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URN: urn:nbn:se:his:diva-13464DOI: 10.1371/journal.pone.0170613ISI: 000396176100086PubMedID: 28125727Scopus ID: 2-s2.0-85010877212OAI: oai:DiVA.org:his-13464DiVA, id: diva2:1086153
Tillgänglig från: 2017-03-31 Skapad: 2017-03-31 Senast uppdaterad: 2018-01-13Bibliografiskt granskad

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