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Phenotypes of myopathy-related beta-tropomyosin mutants in human and mouse tissue cultures
Department of Pathology, University of Gothenburg, Gothenburg, Sweden.
Department of Pathology, University of Gothenburg, Gothenburg, Sweden.
Department of Pathology, University of Gothenburg, Gothenburg, Sweden.
Department of Pathology, University of Gothenburg, Gothenburg, Sweden / Department of Clinical and Medical Genetics, University of Gothenburg, Gothenburg, Sweden.ORCID iD: 0000-0001-8854-5213
2013 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 8, no 9, e72396Article in journal (Refereed) Published
Abstract [en]

Mutations in TPM2 result in a variety of myopathies characterised by variable clinical and morphological features. We used human and mouse cultured cells to study the effects of β-TM mutants. The mutants induced a range of phenotypes in human myoblasts, which generally changed upon differentiation to myotubes. Human myotubes transfected with the E41K-β-TM(EGFP) mutant showed perinuclear aggregates. The G53ins-β-TM(EGFP) mutant tended to accumulate in myoblasts but was incorporated into filamentous structures of myotubes. The K49del-β-TM(EGFP) and E122K-β-TM(EGFP) mutants induced the formation of rod-like structures in human cells. The N202K-β-TM(EGFP) mutant failed to integrate into thin filaments and formed accumulations in myotubes. The accumulation of mutant β-TM(EGFP) in the perinuclear and peripheral areas of the cells was the striking feature in C2C12. We demonstrated that human tissue culture is a suitable system for studying the early stages of altered myofibrilogenesis and morphological changes linked to myopathy-related β-TM mutants. In addition, the histopathological phenotype associated with expression of the various mutant proteins depends on the cell type and varies with the maturation of the muscle cell. Further, the phenotype is a combinatorial effect of the specific amino acid change and the temporal expression of the mutant protein.

Place, publisher, year, edition, pages
PLoS , 2013. Vol. 8, no 9, e72396
National Category
Neurology
Research subject
Medical sciences
Identifiers
URN: urn:nbn:se:his:diva-11951DOI: 10.1371/journal.pone.0072396ISI: 000327538600006PubMedID: 24039757ScopusID: 2-s2.0-84883757390OAI: oai:DiVA.org:his-11951DiVA: diva2:906931
Available from: 2016-02-25 Created: 2016-02-25 Last updated: 2016-03-04Bibliographically approved

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CiteExportLink to record
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