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Myoglobinopathy is an adult-onset autosomal dominant myopathy with characteristic sarcoplasmic inclusions.


ABSTRACT: Myoglobin, encoded by MB, is a small cytoplasmic globular hemoprotein highly expressed in cardiac myocytes and oxidative skeletal myofibers. Myoglobin binds O2, facilitates its intracellular transport and serves as a controller of nitric oxide and reactive oxygen species. Here, we identify a recurrent c.292C>T (p.His98Tyr) substitution in MB in fourteen members of six European families suffering from an autosomal dominant progressive myopathy with highly characteristic sarcoplasmic inclusions in skeletal and cardiac muscle. Myoglobinopathy manifests in adulthood with proximal and axial weakness that progresses to involve distal muscles and causes respiratory and cardiac failure. Biochemical characterization reveals that the mutant myoglobin has altered O2 binding, exhibits a faster heme dissociation rate and has a lower reduction potential compared to wild-type myoglobin. Preliminary studies show that mutant myoglobin may result in elevated superoxide levels at the cellular level. These data define a recognizable muscle disease associated with MB mutation.

SUBMITTER: Olive M 

PROVIDER: S-EPMC6437160 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature

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Myoglobinopathy is an adult-onset autosomal dominant myopathy with characteristic sarcoplasmic inclusions.

Olivé Montse M   Engvall Martin M   Ravenscroft Gianina G   Cabrera-Serrano Macarena M   Jiao Hong H   Bortolotti Carlo Augusto CA   Pignataro Marcello M   Lambrughi Matteo M   Jiang Haibo H   Forrest Alistair R R ARR   Benseny-Cases Núria N   Hofbauer Stefan S   Obinger Christian C   Battistuzzi Gianantonio G   Bellei Marzia M   Borsari Marco M   Di Rocco Giulia G   Viola Helena M HM   Hool Livia C LC   Cladera Josep J   Lagerstedt-Robinson Kristina K   Xiang Fengqing F   Wredenberg Anna A   Miralles Francesc F   Baiges Juan José JJ   Malfatti Edoardo E   Romero Norma B NB   Streichenberger Nathalie N   Vial Christophe C   Claeys Kristl G KG   Straathof Chiara S M CSM   Goris An A   Freyer Christoph C   Lammens Martin M   Bassez Guillaume G   Kere Juha J   Clemente Paula P   Sejersen Thomas T   Udd Bjarne B   Vidal Noemí N   Ferrer Isidre I   Edström Lars L   Wedell Anna A   Laing Nigel G NG  

Nature communications 20190327 1


Myoglobin, encoded by MB, is a small cytoplasmic globular hemoprotein highly expressed in cardiac myocytes and oxidative skeletal myofibers. Myoglobin binds O<sub>2,</sub> facilitates its intracellular transport and serves as a controller of nitric oxide and reactive oxygen species. Here, we identify a recurrent c.292C>T (p.His98Tyr) substitution in MB in fourteen members of six European families suffering from an autosomal dominant progressive myopathy with highly characteristic sarcoplasmic in  ...[more]

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