Amyloid-beta precursor protein

Amyloid-beta precursor protein (APP) is a 770-amino acid cell surface receptor that plays multiple roles in neuronal physiology (UniProt: P05067). APP functions in neurite growth, neuronal adhesion, axonogenesis, and synaptogenesis through cell-cell interactions. The protein acts as a kinesin I membrane receptor mediating axonal transport of beta-secretase and presenilin 1, facilitates transcription regulation via protein-protein interactions, and participates in copper homeostasis and oxidative stress responses through copper ion reduction activity.

APP is widely expressed in the nervous system and functions in both physiological and pathological contexts. Proteolytic cleavage of APP generates amyloid-beta peptides, particularly the neurotoxic forms amyloid-beta 40 and 42, which are central to Alzheimer disease pathology. These peptides accumulate as extracellular plaques and intraneuronal tangles. APP mutations are associated with Alzheimer disease 1 (AD1, MIM 104300) and cerebral amyloid angiopathy APP-related (CAA-APP, MIM 605714), characterized by vascular amyloid deposition, recurrent hemorrhages, and cognitive decline.

No curated autism spectrum disorder association is present in this dataset for APP, though the protein's roles in synaptic development and axonal transport suggest potential relevance to neurodevelopmental processes.