{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nLRPAP1, also known as receptor‐associated protein (RAP), is primarily an endoplasmic reticulum–resident chaperone that ensures the proper folding and maturation of members of the low‐density lipoprotein (LDL) receptor family—most notably LRP1. By binding nascent receptor polypeptides, LRPAP1 prevents premature ligand interactions and facilitates correct receptor assembly as demonstrated by structure–function studies and mutagenesis experiments that have mapped critical binding domains and residues (for example, see."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": " Its interaction with lipoprotein lipase, contributing to the enzyme’s proper assembly, and the TSH‐dependent regulation in thyrocytes for thyroglobulin secretion further highlight its multifaceted chaperone role."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "4", "end_ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its intracellular chaperone activities, LRPAP1 exerts crucial regulatory functions in neurobiology. Extracellularly, it can directly bind amyloid‐beta peptides, enhancing their cellular internalization while concurrently inhibiting aggregation. These actions are thought to modulate amyloid clearance pathways relevant to Alzheimer disease, and indeed, genetic variations in LRPAP1 have been linked to altered risk and the age at disease onset. In addition, studies in microglial cells indicate that under inflammatory or endoplasmic reticulum stress conditions, the release of LRPAP1 can suppress phagocytosis and further influence amyloid–beta homeostasis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "11", "end_ref": "19"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nGenetic and epigenetic studies further implicate LRPAP1 in a range of ocular and metabolic processes. In the eye, homozygous truncating mutations in LRPAP1 disrupt its chaperone function for LRP1, leading to dysregulated TGF‑β activity and contributing to the development of congenital and high myopia."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "20"}]}, {"type": "t", "text": " In parallel, polymorphisms in LRPAP1—such as specific insertion/deletion variants—have been associated with altered cholesterol homeostasis, gallstone disease, and even gallbladder carcinoma, while additional genetic variants correlate with an increased risk for Parkinson’s disease and age–related changes in dementia susceptibility."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "22", "end_ref": "27"}]}, {"type": "t", "text": " Moreover, altered methylation of the LRPAP1 gene in patient serum has been implicated in inflammatory conditions such as rheumatoid arthritis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "28"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Pelayo González, Ruth Alvarez, Julián R Reguero, et al. 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