Mitochondrial Complex V Deficiency, Nuclear Type 1, also known as mc5dn1, is related to leigh syndrome and mitochondrial complex v deficiency, nuclear type 2, and has symptoms including ataxia An important gene associated with Mitochondrial Complex V Deficiency, Nuclear Type 1 is ATPAF2 (ATP Synthase Mitochondrial F1 Complex Assembly Factor 2). Affiliated tissues include liver and brain, and related phenotypes are failure to thrive and hypotonia