{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSORCS1 is emerging as a key regulator in neuronal protein sorting and synaptic integrity. Multiple studies demonstrate that this Vps10p‐domain receptor modulates the metabolism of the amyloid precursor protein (APP) and the generation of amyloid‑β peptides – with overexpression of certain isoforms reducing Aβ production and memory deficits, and deficiency leading to increased Aβ levels. In addition, SORCS1 is shown to interact with critical sorting proteins such as Vps35, SorL1, and neurexins, thereby contributing to proper intracellular trafficking and synaptic organization. Genetic analyses further implicate SORCS1 variants as risk factors for late‑onset Alzheimer’s disease, particularly with evidence of sex‑specific effects and competitive binding that ameliorates Aβ‑induced synaptic pathology."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAt the molecular level, alternative splicing of the SORCS1 gene generates isoforms with distinct cytoplasmic domains that dictate their cell-surface expression and endocytic trafficking. SORCS1 is synthesized as a proreceptor that undergoes furin‐mediated cleavage, and its mature forms can dimerize – a process finely regulated by glycosylation. Moreover, the receptor not only binds its own propeptide with low affinity but also associates with other family members such as sortilin to modulate ligand uptake and downstream signaling (for example, affecting neurotrophic factor pathways). These mechanistic insights underline a complex regulation of intracellular protein trafficking mediated by SORCS1."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its neuronal functions, SORCS1 is implicated in a variety of systemic and metabolic processes. Genetic studies have found that polymorphisms and epigenetic modifications in SORCS1 are associated not only with Alzheimer’s disease across diverse populations but also with disturbances in insulin secretion and glycemic control – linking it to type 1 and type 2 diabetes mellitus, as well as conditions such as polycystic ovary syndrome. In addition, aberrant methylation and reduced expression of SORCS1 have been correlated with poor prognostic outcomes in colorectal cancer. Complementary genome‐wide analyses of glycemic measures provide further context to its pleiotropic role in metabolic regulation and chronic complications."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "13", "end_ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Xueying Liang, Michael Slifer, Eden R Martin, et al. 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