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Keywords = sarco(endo)plasmic reticulum Ca2+ ATPase isoform 1 (SERCA1)

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17 pages, 4056 KB  
Article
The Accordion Zebrafish tq206 Mutant in the Assessment of a Novel Pharmaceutical Approach to Brody Myopathy
by Eylem Emek Akyürek, Francesca Greco, Chiara Tesoriero, Francesco Dalla Barba, Marcello Carotti, Giulia Gorni, Dorianna Sandonà, Andrea Vettori and Roberta Sacchetto
Int. J. Mol. Sci. 2024, 25(17), 9229; https://doi.org/10.3390/ijms25179229 - 25 Aug 2024
Cited by 2 | Viewed by 2048
Abstract
Brody disease (BD) is an “ultra-rare” human genetic disorder of skeletal muscle function due to defects in the atp2a1 gene causing deficiency of the SERCA protein, isoform1. The main clinical signs are exercise-induced stiffness and delayed muscular relaxation after physical exercises, even mild [...] Read more.
Brody disease (BD) is an “ultra-rare” human genetic disorder of skeletal muscle function due to defects in the atp2a1 gene causing deficiency of the SERCA protein, isoform1. The main clinical signs are exercise-induced stiffness and delayed muscular relaxation after physical exercises, even mild ones. No mouse model nor specific therapies exist for Brody myopathy, which is therefore considered an orphan disease. Bovine congenital pseudomyotonia (PMT) is a muscular disorder characterized by an impairment of muscle relaxation and is the only mammalian model of human BD. The pathogenetic mechanism underlying bovine PMT has been recently clarified. These findings prompted us to purpose a potential pharmacological approach addressing a specific population of BD patients who exhibit reduced expression but still exhibit activity of the SERCA1 pump. Preclinical research involving in vivo studies is essential and necessary before clinical trials can be pursued and SERCA protein shows a high degree of conservation among species. So far, the only animal models available to study BD in vivo are a group of zebrafish mutant lines known as accordion zebrafish (acc). In this paper, we focused on a comprehensive characterization of the “acctq206” zebrafish variant. Our aim was to use this mutant line as an experimental animal model for testing the novel therapeutic approach for BD. Full article
(This article belongs to the Special Issue Zebrafish as a Model in Human Disease: 3rd Edition)
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14 pages, 2284 KB  
Article
Differential Analysis of Gly211Val and Gly286Val Mutations Affecting Sarco(endo)plasmic Reticulum Ca2+-ATPase (SERCA1) in Congenital Pseudomyotonia Romagnola Cattle
by Eylem Emek Akyürek, Francesca Busato, Leonardo Murgiano, Elisa Bianchini, Marcello Carotti, Dorianna Sandonà, Cord Drögemüller, Arcangelo Gentile and Roberta Sacchetto
Int. J. Mol. Sci. 2022, 23(20), 12364; https://doi.org/10.3390/ijms232012364 - 15 Oct 2022
Cited by 5 | Viewed by 2938
Abstract
Congenital pseudomyotonia in cattle (PMT) is a rare skeletal muscle disorder, clinically characterized by stiffness and by delayed muscle relaxation after exercise. Muscle relaxation impairment is due to defective content of the Sarco(endo)plasmic Reticulum Ca2+ ATPase isoform 1 (SERCA1) protein, caused by [...] Read more.
Congenital pseudomyotonia in cattle (PMT) is a rare skeletal muscle disorder, clinically characterized by stiffness and by delayed muscle relaxation after exercise. Muscle relaxation impairment is due to defective content of the Sarco(endo)plasmic Reticulum Ca2+ ATPase isoform 1 (SERCA1) protein, caused by missense mutations in the ATP2A1 gene. PMT represents the only mammalian model of human Brody myopathy. In the Romagnola breed, two missense variants occurring in the same allele were described, leading to Gly211Val and Gly286Val (G211V/G286V) substitutions. In this study, we analyzed the consequences of G211V and G286V mutations. Results support that the reduced amount of SERCA1 is a consequence of the G211V mutation, the G286V mutation almost being benign and the ubiquitin–proteasome system (UPS) being involved. After blocking the proteasome using a proteasome inhibitor, we found that the G211V mutant accumulates in cells at levels comparable to those of WT SERCA1. Our conclusion is that G211/286V mutations presumably originate in a folding-defective SERCA1 protein, recognized and diverted to degradation by UPS, although still catalytically functional, and that the main role is played by G211V mutation. Rescue of mutated SERCA1 to the sarcoplasmic reticulum membrane can re-establish resting cytosolic Ca2+ concentration and prevent the appearance of pathological signs, paving the way for a possible therapeutic approach against Brody disease. Full article
(This article belongs to the Special Issue Novel Molecular Approaches to Skeletal Muscle Disease and Disuse 2.0)
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