Multiple Mitochondrial Dysfunctions Syndrome 4, also known as mmds4, is related to leukodystrophy and multiple mitochondrial dysfunctions syndrome. An important gene associated with Multiple Mitochondrial Dysfunctions Syndrome 4 is ISCA2 (Iron-Sulfur Cluster Assembly 2), and among its related pathways/superpathways is Mitochondrial iron-sulfur cluster biogenesis. Affiliated tissues include eye and spinal cord, and related phenotypes are spasticity and optic atrophy