Leigh Syndrome, also known as leigh disease, is related to mitochondrial complex iv deficiency, nuclear type 5 and mitochondrial dna-associated leigh syndrome, and has symptoms including ataxia, muscle spasticity and ophthalmoplegia. An important gene associated with Leigh Syndrome is SDHA (Succinate Dehydrogenase Complex Flavoprotein Subunit A), and among its related pathways/superpathways are Metabolism and Respiratory electron transport, ATP synthesis by chemiosmotic coupling, and heat production by uncoupling proteins.. The drugs Cysteamine and Ubidecarenone have been mentioned in the context of this disorder. Affiliated tissues include spinal cord and eye, and related phenotypes are abnormality of movement and increased serum lactate