This information is provided by the National Institutes of Health (NIH) Genetic and Rare Diseases Information Center (GARD).
Nuclear gene-encoded Leigh syndrome is a progressive neurological disease. It usually first becomes apparent in infancy with developmental delay or regression. Rarely, the disease begins in adolescence or adulthood. Symptoms progress to include generalized weakness, lack of muscle tone, spasticity, movement disorders, cerebellar ataxia, and peripheral neuropathy. Other signs and symptoms may include an increase in the heart muscle size (hypertrophic cardiomyopathy); excessive body hair (hypertrichosis); anemia; kidney or liver problems; and lung or heart failure. Nuclear gene-encoded Leigh syndrome (and Leigh-like syndrome, a term used for cases with similar features but that do not fulfill the diagnostic criteria for Leigh syndrome) may be caused by mutations in any of several genes and can be inherited in an autosomal recessive or X-linked manner. While treatment for some cases of Leigh-like syndrome may be available, management is generally supportive and focuses on the symptoms present.
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