Heat shock 70 kDa protein 12A

Heat shock 70 kDa protein 12A (HSPA12A) is a heat shock protein that functions as an adapter protein for SORL1, delaying its internalization and modulating its subcellular localization (UniProt: O43301). This interaction places HSPA12A in the context of endosomal sorting pathways relevant to protein trafficking and cellular homeostasis.

HSPA12A shows disease relevance to Alzheimer's Disease based on curation in the Chaparral Knowledge Platform. Proteomics analysis of human post-mortem AD brain tissue compared to age-matched controls revealed ambiguous directional changes across subcellular fractions (P2, P3, S2, S3) by TMT-labeled quantitative mass spectrometry, with a mean log2 fold-change of −0.172 (Chaparral AD proteomics). The modest magnitude and inconsistent direction across fractions suggest variable abundance changes depending on cellular compartment, warranting further investigation into HSPA12A's role in AD-related pathophysiology, particularly given its involvement in SORL1-mediated sorting.