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Drosophila model of myosin myopathy rescued by overexpression of a TRIM-protein family member
University of Gothenburg, Gothenburg, Sweden.
Institut Investigació Biomèdica de Bellvitge – Hospital de Bellvitge, Hospitalet de Llobregat, Barcelona, Spain.
University of Gothenburg, Gothenburg, Sweden.
University of Skövde, School of Health and Education. University of Skövde, Health and Education. (Translational Medicine TRIM Biomedical Genetics)ORCID iD: 0000-0001-8962-0860
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2018 (English)In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 115, no 28, p. E6566-E6575Article in journal (Refereed) Published
Abstract [en]

Myosin is a molecular motor indispensable for body movement and heart contractility. Apart from pure cardiomyopathy, mutations in MYH7 encoding slow/β-cardiac myosin heavy chain also cause skeletal muscle disease with or without cardiac involvement. Mutations within the α-helical rod domain of MYH7are mainly associated with Laing distal myopathy. To investigate the mechanisms underlying the pathology of the recurrent causative MYH7 mutation (K1729del), we have developed a Drosophila melanogaster model of Laing distal myopathy by genomic engineering of the Drosophila Mhc locus. Homozygous MhcK1728del animals die during larval/pupal stages, and both homozygous and heterozygous larvae display reduced muscle function. Flies expressing only MhcK1728del in indirect flight and jump muscles, and heterozygous MhcK1728del animals, were flightless, with reduced movement and decreased lifespan. Sarcomeres of MhcK1728del mutant indirect flight muscles and larval body wall muscles were disrupted with clearly disorganized muscle filaments. Homozygous MhcK1728del larvae also demonstrated structural and functional impairments in heart muscle, which were not observed in heterozygous animals, indicating a dose-dependent effect of the mutated allele. The impaired jump and flight ability and the myopathy of indirect flight and leg muscles associated with MhcK1728del were fully suppressed by expression of Abba/Thin, an E3-ligase that is essential for maintaining sarcomere integrity. This model of Laing distal myopathy in Drosophila recapitulates certain morphological phenotypic features seen in Laing distal myopathy patients with the recurrent K1729del mutation. Our observations that Abba/Thin modulates these phenotypes suggest that manipulation of Abba/Thin activity levels may be beneficial in Laing distal myopathy.

Place, publisher, year, edition, pages
National Academy of Sciences , 2018. Vol. 115, no 28, p. E6566-E6575
National Category
Genetics Neurology
Research subject
Biomedical Genetics
Identifiers
URN: urn:nbn:se:his:diva-15878DOI: 10.1073/pnas.1800727115ISI: 000438050900023PubMedID: 29946036Scopus ID: 2-s2.0-85049855441OAI: oai:DiVA.org:his-15878DiVA, id: diva2:1229038
Available from: 2018-06-29 Created: 2018-06-29 Last updated: 2019-11-20Bibliographically approved

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Ejeskär, KatarinaTajsharghi, Homa

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