Mitochondrial Complex Ii Deficiency, Nuclear Type 2, is also known as mitochondrial complex 2 deficiency, nuclear type 2. An important gene associated with Mitochondrial Complex Ii Deficiency, Nuclear Type 2 is SDHAF1 (Succinate Dehydrogenase Complex Assembly Factor 1). Affiliated tissues include skeletal muscle and brain, and related phenotypes are developmental regression and spastic tetraplegia