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Developmental MYH3 Myopathy Associated with Expression of Mutant Protein and Reduced Expression Levels of Embryonic MyHC

Journal article
Authors Malgorzata Pokrzywa
M. Norum
Johan Lengqvist
Mehrnaz Ghobadpour
Saba Abdul-Hussein
Ali-Reza Moslemi
Homa Tajsharghi
Published in PLoS One
Volume 10
Issue 11
ISSN 1932-6203
Publication year 2015
Published at Institute of Biomedicine, Department of Medical and Clinical Genetics
Institute of Biomedicine, Department of Pathology
Core Facilities, Proteomics
Language en
Links dx.doi.org/10.1371/journal.pone.014...
Keywords myosin heavy-chain, skeletal-muscle, iib-myosin, in-vivo, gene, mutations, hypertrophy, atrophy, mouse, mice, Science & Technology - Other Topics, hiaffino s, 1994, journal of applied physiology, v77, p493
Subject categories Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy)

Abstract

Objective An essential role for embryonic MyHC in foetal development has been found from its association with distal arthrogryposis syndromes, a heterogeneous group of disorders characterised by congenital contractions. The latter probably result from severe myopathy during foetal development. Lack of embryonic muscle biopsy material and suitable animal models has hindered study of the pathomechanisms linking mutations in MYH3 to prenatal myopathy. We determined the pathomechanisms of developmental myopathy caused by recurrent p. Thr178Ile MYH3 heterozygosity, using patient-derived skeletal muscle cells in culture as an experimental disease model to emulate early embryonic development. These cultured cells were processed for discrimination and quantitative analysis of mutant and wild-type MYH3 alleles and MyHC transcripts, real-time RT-qPCR, sequence analysis, immunofluorescence microscopy, immunoblot, and proteomic assessments. Involvement of the ubiquitin proteasome system was investigated in patients with p. Thr178Ile mutations in MYH3 and MYH2. We found equal overall expression of mutant and wild-type MyHC mRNAs and proteins. Compared to the controls, however, expression of embryonic MyHC transcripts and proteins was reduced whereas expression of myosin-specific E3 ubiquitin ligase (MuRF1) was increased. We also found delayed myofibrillogenesis and atrophic myotubes but structured sarcomeres. In conclusion, this study suggests that developmental p.Thr178Ile MYH3 myopathy is associated with a combined pathomechanism of insufficient dosage of functional embryonic MyHC and production of mutant protein.

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