This information is provided by the National Institutes of Health (NIH) Genetic and Rare Diseases Information Center (GARD).
Leber hereditary optic neuropathy (LHON) with dystonia is a very rare variant of LHON where an individual has LHON associated with dystonia, which involves involuntary muscle contractions, tremors, and other unctrolled movements. It is caused by mutations in one of three mitochondrial genes: MT-ND1, MT-ND3, MT-ND4, and MT-ND6. Other features that have been associated with this condition include difficulty walking, muscle wasting, scoliosis, dysphagia, dysarthria, intellectual disability, dementia, and spasticity. The dystonia usually begins in childhood; vision loss may begin in early adulthood.
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