Tragedy in a heartbeat: malfunctioning desmin causes skeletal and cardiac muscle disease - PubMed (original) (raw)
Review
. 2009 Jul;119(7):1806-13.
doi: 10.1172/JCI38027. Epub 2009 Jul 1.
Affiliations
- PMID: 19587455
- PMCID: PMC2701871
- DOI: 10.1172/JCI38027
Review
Tragedy in a heartbeat: malfunctioning desmin causes skeletal and cardiac muscle disease
Lev G Goldfarb et al. J Clin Invest. 2009 Jul.
Erratum in
- J Clin Invest. 2011 Jan 4;121(1):455
Abstract
Muscle fiber deterioration resulting in progressive skeletal muscle weakness, heart failure, and respiratory distress occurs in more than 20 inherited myopathies. As discussed in this Review, one of the newly identified myopathies is desminopathy, a disease caused by dysfunctional mutations in desmin, a type III intermediate filament protein, or alphaB-crystallin, a chaperone for desmin. The range of clinical manifestations in patients with desminopathy is wide and may overlap with those observed in individuals with other myopathies. Awareness of this disease needs to be heightened, diagnostic criteria reliably outlined, and molecular testing readily available; this would ensure prevention of sudden death from cardiac arrhythmias and other complications.
Figures
Figure 1. Molecular cytoarchitecture of a myocyte, featuring proteins involved in skeletal and cardiac myopathies.
Desmin is the main muscle IF protein. It interacts with other proteins to support myofibrils at the level of the Z disc and forms a continuous cytoskeletal IF network that maintains a spatial relationship between the contractile apparatus and other structural elements of the cell. Desmin provides maintenance of cellular integrity, force transmission, and mechanochemical signaling. Mutations in other sarcomeric and cytoskeletal proteins (plectin, myotilin, filamin C, αB-crystallin, Z band alternatively spliced PDZ-motif protein [ZASP], and BCL2-associated athanogene 3 [BAG3]) cause neuromuscular disorders. Adapted with permission from New England Journal of Medicine (61).
Figure 2. Updated chart of desmin mutations.
Top: Desmin is composed of an α-helical rod containing 303 amino acid residues, flanked by globular N- and C-terminal structures (known as the head and tail domains, respectively). The rod is interrupted in several places, resulting in four consecutive α-helical segments, 1A, 1B, 2A, and 2B, connected by short, nonhelical linkers. Helical segment 2B contains a discontinuity in the heptad repeat pattern (known as a stutter) and an YRKLLEGEE motif (red boxes within the protein structure). Most pathogenic desmin mutations reside within either the 2B helical segment or the tail. Bottom: Molecular model of desmin coiled-coil segment based on analogy with crystallographic data for human vimentin. The stutter is a discontinuity in the heptad repeat pattern equivalent to an insertion of four extra residues, an absolutely conserved feature of all IF proteins. Starting with several amino acids preceding the YR motif and through the YR peptide, the coiled-coil structure loosens and the monomers gradually separate, eventually bending away from each other. The angles and distances between residue positions in the 2B C-terminal helical segment are shown. The bottom portion has been adapted with permission from Journal of Molecular Biology (22).
Figure 3. Schematic representation of the destructive effects of desmin mutations in muscles of patients with desminopathy.
(A) Normal molecular cytoarchitecture of a myocyte (as presented in Figure 1). (B) Mutant desmin causes disorganization of the Z discs and affects the integrity of the cellular IF network. (C) Fragmented desmin filaments form insoluble deposits that accumulate and eventually cause myopathy by disrupting the myofibrils, breaking the connections between them and upsetting the binding of the myofibrils to cellular membranes. Adapted with permission from New England Journal of Medicine (61).
Figure 4. Myopathological images of skeletal muscle in patients with desminopathy.
(A) Cross-section of a muscle biopsy from a patient with desminopathy, stained with trichrome and examined by light microscopy, shows characteristic amorphous deposits. (B) Serial sections stained with trichrome and immunostained for desmin indicate that these deposits contained desmin. (C) EM analysis of the same sample shows destruction of the Z discs, which eventually leads to disorganization of myofibrils (see text for details). B and C adapted with permission from New England Journal of Medicine (61).
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