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From the Neuromuscular Research Department (Drs. Raffelsberger, Rossmanith, and Bittner), Institute of Anatomy, University of Vienna, and the Landesklinik für Augenheilkunde und Optometrie (Dr. Thaller-Antlanger), Sonderauftrag Augenmotilität, Salzburg, Austria.
Address correspondence and reprint requests to Dr. Reginald E. Bittner, Neuromuscular Research Department, Institute of Anatomy, University of Vienna, Währinger Straße 13, 1090 Wien, Austria; e-mail: reginald.bittner@ univie.ac.at
In the muscle biopsy of a female patient with chronic progressive external ophthalmoplegia (CPEO), myopathy, and exercise intolerance, the heteroplasmic deletion of a single nucleotide (
T5885) in the mitochondrial tRNA tyrosine gene (tRNATyr) was found. The mutation was associated with the mitochondrial phenotype of individual muscle fibers, suggesting a causal association of
T5885 with the mitochondrial disease phenotype. The microdeletion was absent from the patients and her relatives blood, indicating a spontaneous somatic origin.
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