TOMM40 (Translocase of Outer Mitochondrial Membrane 40): TOMM40 is a critical protein involved in mitochondrial function, specifically in importing proteins into the mitochondria. As a component of the TOM complex, TOMM40 facilitates the transport of nuclear-encoded proteins across the outer mitochondrial membrane, allowing them to perform essential functions within the mitochondria. Variants of TOMM40 are closely linked to Alzheimer's disease, affecting the risk and age of onset. It is also associated with other neurodegenerative disorders and age-related cognitive decline.