Mitochondrial Dna Depletion Syndrome 7, also known as ohaha syndrome, is related to spinocerebellar ataxia, autosomal recessive 8 and parkinsonism, and has symptoms including muscle spasticity, tremor and abnormal pyramidal signs. An important gene associated with Mitochondrial Dna Depletion Syndrome 7 is TWNK (Twinkle MtDNA Helicase), and among its related pathways/superpathways are Primary ovarian insufficiency and Valproic Acid Pathway, Pharmacodynamics. Affiliated tissues include liver and spinal cord, and related phenotypes are ataxia and hearing impairment