Abstract
Abstract Objective Motor neuron disease (MND) is a common neurodegenerative condition for which the underlying cause is uncertain in many patients. We identified a patient with clinical features suggestive of MND but additional cardiac and metabolic symptoms. We wished to determine if the clinical features were due to a mitochondrial DNA mutation.Methods The brain and spinal cord were studied using neuropathological techniques and agenetic defect investigated in individual neurons.Results There were atypical neuropathological features and genetic studies identified a pathogenic, heteroplasmic mitochondria tRNAIle (4274T>C) mutation.InterpretationThis case adds to the phenotypic variation seen in mitochondrial DNA disease but also highlights the potential role of mitochondrial dysfunction in the cause of MND. Ann Neurol 2006
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