ArticleJournal of cachexia, sarcopenia and muscle2025
R405W Desmin Knock-In Mice Highlight Alterations of Mitochondria, Protein Quality Control and Myofibrils in Myofibrillar Myopathy.
Article in Journal of cachexia, sarcopenia and muscle, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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Who cites it
2 citing papers in PubMed.
- R405W Desmin Knock-In Mice Highlight Alterations of Mitochondria, Protein Quality Control and Myofibrils in Myofibrillar Myopathy.Journal of cachexia, sarcopenia and muscle · 2025Article
- Quantification of Exercise-Induced Sarcomeric Damage in R349P Desmin Knock-In Mice: A New Approach in Myofibrillar Myopathy Research.Neuropathology and applied neurobiology · 2025Article
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Authors and funding
20 authors.
Funding
Abstract
backgroundMutations in the desmin gene cause skeletal myopathies and cardiomyopathies. The objective of this study was to elucidate the molecular pathology induced by the expression of R405W mutant desmin in murine skeletal muscle.
methodsA comprehensive characterization of the skeletal muscle pathology in hetero- and homozygous R405W desmin knock-in mice was performed. This included grip strength, blood acylcarnitine and amino acid, histological, ultrastructural, immunofluorescence, immunoblot, ribosomal stalling, RNA sequencing and proteomic analyses.
resultsBoth hetero- and homozygous R405W desmin knock-in mice showed classical myopathological features of a myofibrillar myopathy with desmin-positive protein aggregation, degenerative changes of the myofibrillar apparatus and mitochondrial alterations. Muscle weakness and increased blood concentrations of acylcarnitines and amino acids were only present in homozygous animals. During its translation, mutant desmin did not induce terminal ribosomal stalling. Analyses of RNA sequencing and proteomic data from soleus muscle of 3-month-old mice depicted 59 up- and 3 down-regulated mRNAs and 101 up- and 18 down-regulated proteins that were shared between the heterozygous and homozygous genotypes in the respective omics datasets compared to the wild-type genotype. Combined analysis of the omics data demonstrated 187 significantly dysregulated candidates distributed across four groups of regulation. A down-regulation on the mRNA and protein levels was observed for a multitude of mitochondrial proteins including essential proton gradient-dependent carriers. Up-regulation on both omics levels was present for the transcription factor Mlf1, which is a binding partner of protein quality control related Dnajb6. Down-regulated on mRNA but up-regulated on the protein level was the sarcomeric lesion marker Xirp2 (xin actin-binding repeat-containing protein 2), whereas Ces2c (acylcarnitine hydrolase) was regulated in the opposite way.
conclusionsThe present study demonstrates that the expression of mutant desmin results in a myofibrillar myopathy in hetero- and homozygous R405W desmin knock-in mice. Combined morphological, transcriptomic and proteomic analyses helped decipher the complex pattern of early pathological changes induced by the expression of mutant desmin. Our findings highlight the importance of major mitochondrial alterations, including essential proton gradient-dependent carriers as well as Dnajb6-related protein quality control and Xin-related myofibrillar damage, in the molecular pathogenesis of desminopathies.
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