Mitochondrial Dna Depletion Syndrome 9, also known as fatal infantile lactic acidosis, is related to mitochondrial dna depletion syndrome 5 and mitochondrial dna depletion syndrome. An important gene associated with Mitochondrial Dna Depletion Syndrome 9 is SUCLG1 (Succinate-CoA Ligase GDP/ADP-Forming Subunit Alpha), and among its related pathways/superpathways are Metabolism and Respiratory electron transport, ATP synthesis by chemiosmotic coupling, and heat production by uncoupling proteins.. Affiliated tissues include skeletal muscle and brain, and related phenotypes are hyperhidrosis and hypothermia