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Splice mutation in the iron-sulfur cluster scaffold protein ISCU causes myopathy with exercise intolerance |
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| Authors: | Mochel Fanny Knight Melanie A Tong Wing-Hang Hernandez Dena Ayyad Karen Taivassalo Tanja Andersen Peter M Singleton Andrew Rouault Tracey A Fischbeck Kenneth H Haller Ronald G |
| Institution: | 1 Developmental and Metabolic Neurology Branch, NINDS, NIH, Bethesda, MD 20892, USA 2 Neurogenetics Branch, NINDS, NIH, Bethesda, MD 20892, USA 3 Cell Biology and Metabolism Branch, NICHD, NIH, Bethesda, MD 20892, USA 4 Laboratory of Neurogenetics, NIA, NIH, Bethesda, MD 20892, USA 5 VA North Texas Medical Center, Dallas, TX 75216, USA 6 Department of Kinesiology, McGill University, Montreal H2W 1S4, Canada 7 Institute of Clinical Neuroscience, Umeå University Hospital, Umeå 90185, Sweden 8 Department of Neurology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA 9 Neuromuscular Center, Institute for Exercise and Environmental Medicine of Presbyterian Hospital, Dallas, TX 75231, USA |
| Abstract: | A myopathy with severe exercise intolerance and myoglobinuria has been described in patients from northern Sweden, with associated deficiencies of succinate dehydrogenase and aconitase in skeletal muscle. We identified the gene for the iron-sulfur cluster scaffold protein ISCU as a candidate within a region of shared homozygosity among patients with this disease. We found a single mutation in ISCU that likely strengthens a weak splice acceptor site, with consequent exon retention. A marked reduction of ISCU mRNA and mitochondrial ISCU protein in patient muscle was associated with a decrease in the iron regulatory protein IRP1 and intracellular iron overload in skeletal muscle, consistent with a muscle-specific alteration of iron homeostasis in this disease. ISCU interacts with the Friedreich ataxia gene product frataxin in iron-sulfur cluster biosynthesis. Our results therefore extend the range of known human diseases that are caused by defects in iron-sulfur cluster biogenesis. |
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