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Transient restoration of succinate dehydrogenase activity after rhabdomyolysis in iron-sulphur cluster deficiency myopathy.

Journal article
Authors Gittan Kollberg
Atle Melberg
Elisabeth Holme
Anders Oldfors
Published in Neuromuscular disorders
Volume 21
Issue 2
Pages 115-120
ISSN 1873-2364
Publication year 2011
Published at Institute of Biomedicine, Department of Clinical Chemistry and Transfusion Medicine
Institute of Biomedicine, Department of Pathology
Pages 115-120
Language en
Links dx.doi.org/10.1016/j.nmd.2010.11.01...
Keywords ISCU; Mitochondria; Muscle regeneration; Succinate dehydrogenase deficiency
Subject categories Morphology, Molecular medicine, Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy)

Abstract

Myopathy with exercise intolerance and deficiency of iron-sulphur cluster proteins is caused by an intronic IVS5+382 G>C mutation in ISCU, the gene encoding the iron-sulphur cluster assembly protein (IscU). The mutation causes alternative splicing resulting in a truncated protein and severely reduced levels of IscU protein in muscle tissue. Disease manifestations include muscle fatigability, dyspnoea, cardiac palpitations and episodic myoglobinuria. Muscle tissue of these patients demonstrates marked histochemical succinate dehydrogenase deficiency and accumulation of iron in muscle fibres, which are morphological hallmarks of the disease. A biopsy specimen from a patient, two months after a severe attack of rhabdomyolysis, revealed regenerating muscle with normal succinate dehydrogenase activity and only minor iron accumulation, whereas another biopsy obtained nine years after the episode showed the typical hallmarks of the disease. The apparent explanation for the normal succinate dehydrogenase activity during regeneration was a markedly increased level of IscU protein in regenerating muscle tissue and an increase in normally spliced ISCU transcripts in the patient. The results have implications for diagnosis of the disease based on muscle biopsy findings and support the concept that an increase of normally spliced ISCU by RNA modulating therapy may be a therapeutic possibility for these patients.

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