OCIAD1 is a mitochondrial inner membrane protein that plays critical roles in mitochondrial bioenergetics and lipid metabolism. Primary function: OCIAD1 regulates mitochondrial electron transport chain (ETC) Complex I and Complex III activity 12. It interacts with prohibitin complexes to stabilize Complex III assembly factors, particularly the proteolytic processing of cytochrome c1 2, and protects TIM23 translocase components from protease-mediated degradation 3. Mechanism: OCIAD1 functions as a scaffold protein within prohibitin assemblies, modulating energy metabolism by suppressing oxidative phosphorylation and maintaining glycolytic dependency in pluripotent stem cells 1. It localizes at the mitochondria-peroxisome intersection, regulating lipid metabolism through interactions with enzymes FAR1 and ABCD3, controlling ether phospholipid and odd-chain phospholipid synthesis 4. Disease relevance: OCIAD1 elevation associates with Alzheimer's disease pathology; its depletion ameliorates amyloid-beta deposition and reduces pro-inflammatory microglial activation by enhancing mitochondrial energy metabolism while suppressing STAT3 and NF-κB signaling 5. Genetic studies identify OCIAD1 expression as a mitochondrial-linked factor associated with blood pressure regulation 6. Clinical significance: OCIAD1 represents a therapeutic target for neurodegenerative disease and metabolic disorders through modulation of mitochondrial bioenergetics.