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Virginia Barone, Davide Randazzo, Valeria Del Re, Vincenzo Sorrentino, Daniela Rossi
The sarcoplasmic reticulum (SR) of striated muscles is specialized for releasing Ca(2+) following sarcolemma depolarization in order to activate muscle contraction. To this end, the SR forms a network of longitudinal tubules and cisternae that surrounds the myofibrils and, at the same time, participates to the assembly of the triadic junctional membrane complexes formed by the close apposition of one t-tubule, originated from the sarcolemma, and two SR terminal cisternae. Advancements in understanding the molecular basis of the SR structural organization have identified an interaction between sAnk1, a transmembrane protein located on the longitudinal SR (l-SR) tubules, and obscurin, a myofibrillar protein...
December 2015: Journal of Muscle Research and Cell Motility
Michelle R Mousel, James O Reynolds, Stephen N White
Entropion is an inward rolling of the eyelid allowing contact between the eyelashes and cornea that may lead to blindness if not corrected. Although many mammalian species, including humans and dogs, are afflicted by congenital entropion, no specific genes or gene regions related to development of entropion have been reported in any mammalian species to date. Entropion in domestic sheep is known to have a genetic component therefore, we used domestic sheep as a model system to identify genomic regions containing genes associated with entropion...
2015: PloS One
David Pla-Martín, Eduardo Calpena, Vincenzo Lupo, Celedonio Márquez, Eloy Rivas, Rafael Sivera, Teresa Sevilla, Francesc Palau, Carmen Espinós
Mutations in the GDAP1 gene cause different forms of Charcot-Marie-Tooth (CMT) disease, and the primary clinical expression of this disease is markedly variable in the dominant inheritance form (CMT type 2K; CMT2K), in which carriers of the GDAP1 p.R120W mutation can display a wide range of clinical severity. We investigated the JPH1 gene as a genetic modifier of clinical expression variability because junctophilin-1 (JPH1) is a good positional and functional candidate. We demonstrated that the JPH1-GDAP1 cluster forms a paralogon and is conserved in vertebrates...
January 1, 2015: Human Molecular Genetics
Isuru D Jayasinghe, Michelle Munro, David Baddeley, Bradley S Launikonis, Christian Soeller
Localization microscopy is a fairly recently introduced super-resolution fluorescence imaging modality capable of achieving nanometre-scale resolution. We have applied the dSTORM variation of this method to image intracellular molecular assemblies in skeletal muscle fibres which are large cells that critically rely on nanoscale signalling domains, the triads. Immunofluorescence staining in fixed adult rat skeletal muscle sections revealed clear differences between fast- and slow-twitch fibres in the molecular organization of ryanodine receptors (RyRs; the primary calcium release channels) within triads...
October 6, 2014: Journal of the Royal Society, Interface
David Della-Morte, Liyong Wang, Ashley Beecham, Susan H Blanton, Hongyu Zhao, Ralph L Sacco, Tatjana Rundek, Chuanhui Dong
BACKGROUND AND PURPOSE: Smoking greatly increases the risk of atherosclerotic plaque and the effect may vary from individual to individual. A genome-wide scan was performed for smoking×single nucleotide polymorphism (SNP) interactions on carotid plaque burden (CPB) to identify the potential genetic moderators in Hispanics. METHODS: Carotid B-mode ultrasonography and genotyping by the Affymetrix 6.0 chip were performed in a discovery sample of 665 Caribbean Hispanics, followed by replication analyses in 264 Caribbean Hispanics...
September 15, 2014: Journal of the Neurological Sciences
Christophe Hourdé, Pierre Joanne, Fadia Medja, Nathalie Mougenot, Adeline Jacquet, Etienne Mouisel, Alice Pannerec, Stéphane Hatem, Gillian Butler-Browne, Onnik Agbulut, Arnaud Ferry
It is well known that inactivity/activity influences skeletal muscle physiological characteristics. However, the effects of inactivity/activity on muscle weakness and increased susceptibility to muscle contraction-induced injury have not been extensively studied in mdx mice, a murine model of Duchenne muscular dystrophy with dystrophin deficiency. In the present study, we demonstrate that inactivity (ie, leg immobilization) worsened the muscle weakness and the susceptibility to contraction-induced injury in mdx mice...
May 2013: American Journal of Pathology
Yoshihisa Matsushita, Toru Furukawa, Hiroshi Kasanuki, Makoto Nishibatake, Yachiyo Kurihara, Atsushi Ikeda, Naoyuki Kamatani, Hiroshi Takeshima, Rumiko Matsuoka
Junctophilin subtypes, designated as JPH1 approximately 4, are protein components of junctional complexes and play essential roles in cellular Ca2+ signaling in excitable cells. Knockout mice lacking the cardiac-type Jph2 die of embryonic cardiac arrest, and the mutant cardiac myocytes exhibit impaired formation of peripheral couplings and arrhythmic Ca2+ signaling caused by functional uncoupling between dihydropyridine and ryanodine receptor channels. Based on these observations, we hypothesized that mutations of JPH2 could cause human genetic cardiac diseases...
2007: Journal of Human Genetics
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