{"gene":"SORCS3","run_date":"2026-06-10T07:46:38","timeline":{"discoveries":[{"year":1999,"finding":"SorCS3 (SorCS) was identified as a novel VPS10-domain receptor with an N-terminal VPS10 domain, leucine-rich repeats, a transmembrane domain, and a short intracellular C-terminus containing consensus signals for rapid internalization and putative SH2/SH3 binding motifs, distinct from other VPS10 family members.","method":"Molecular cloning, sequence analysis, domain identification","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — initial cloning and domain characterization across multiple sequence analyses in a single study; no functional mutagenesis","pmids":["10600506"],"is_preprint":false},{"year":2000,"finding":"An alternatively spliced transcript of SorCS3 was identified that encodes a protein with an identical extracellular/transmembrane region but a completely divergent cytoplasmic tail lacking canonical internalization or sorting signals.","method":"RT-PCR, cDNA cloning, sequence analysis of splice variant","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct molecular identification of splice variant; functional consequences not validated","pmids":["10760602"],"is_preprint":false},{"year":2004,"finding":"SorCS3 expression in hippocampal neurons is upregulated by kainic acid-induced seizures in an activity-dependent manner that does not require de novo protein synthesis, distinguishing it from the related receptor SorCS1.","method":"In situ hybridization, kainic acid seizure model, protein synthesis inhibitor treatment","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct pharmacological dissection of activity-dependent expression regulation with inhibitor controls, single lab","pmids":["15009648"],"is_preprint":false},{"year":2005,"finding":"SorCS3 is synthesized as a proprotein and undergoes N-terminal propeptide cleavage in distal Golgi compartments to produce its mature form. The propeptide is not required for normal processing, does not prevent ligand binding, and the receptor predominantly localizes to the plasma membrane with slow internalization and no detectable intracellular trafficking activity. SorCS3 binds nerve growth factor (NGF) as a neurotrophin ligand.","method":"Cell transfection, pulse-chase processing assay, ligand-binding assay with purified receptor, subcellular fractionation/localization","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro ligand binding with purified receptor, biochemical processing assay, and localization experiments in a single study with multiple orthogonal methods","pmids":["15710408"],"is_preprint":false},{"year":2013,"finding":"SORCS3 localizes to the postsynaptic density in hippocampal neurons and is required for NMDA receptor-dependent and -independent forms of long-term depression (LTD). Loss of SORCS3 abrogates LTD and causes faulty localization of the adaptor protein PICK1, suggesting that SORCS3 controls glutamate receptor trafficking at the postsynapse via functional interaction with PICK1.","method":"Gene-targeted knockout mice, electrophysiology (LTD recordings), immunofluorescence/postsynaptic density fractionation, targeted proteomics (interaction with PICK1), behavioral fear extinction assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (KO mouse + electrophysiology + proteomics interaction + subcellular localization + behavior) in a single rigorous study with well-defined phenotypic readouts","pmids":["24069373"],"is_preprint":false},{"year":2014,"finding":"The SorCS3 cytoplasmic domain targets the receptor to the Golgi apparatus and vesicular structures, and conveys internalization through canonical endocytic motifs in an AP-2-dependent manner. In neurons, SorCS3 protein is localized to vesicles in the soma and dendrites.","method":"Chimeric receptor expression in neurons, live-cell imaging/immunofluorescence, AP-2 co-localization, endocytic motif mutagenesis (implied by domain swap experiments)","journal":"The Journal of comparative neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with chimeric constructs, AP-2 dependency tested, single lab","pmids":["24715575"],"is_preprint":false},{"year":2017,"finding":"SorCS3-deficient hippocampal CA1 neurons show reduced basal synaptic transmission (decreased fEPSP slopes), enhanced synaptic facilitation, and reduced synaptic depression during repetitive stimulation, consistent with increased mobility of postsynaptic AMPA receptors. SorCS3 was previously shown to interact with PSD-95 and PICK1 at the postsynaptic density.","method":"Electrophysiology on acute brain slices from Sorcs3 knockout mice, immunohistochemistry, patch-clamp recordings","journal":"Hippocampus","confidence":"High","confidence_rationale":"Tier 2 / Strong — rigorous electrophysiological characterization in KO model with multiple stimulation protocols and age groups, complemented by immunohistochemistry; replicates postsynaptic role established previously","pmids":["27935149"],"is_preprint":false},{"year":2017,"finding":"SorCS3 extracellular domains form stable homodimers and monomers co-existing in equilibrium. Glycosylation regulates the oligomeric state: enzymatic deglycosylation promotes dimerization of monomers. Membrane-bound dimers were confirmed by co-immunoprecipitation from cell lysate.","method":"Biochemical purification, electron microscopy, co-immunoprecipitation, enzymatic deglycosylation","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — purified protein electron microscopy plus reciprocal Co-IP from cell membranes plus biochemical deglycosylation experiment, multiple orthogonal methods in one study","pmids":["28827148"],"is_preprint":false},{"year":2018,"finding":"SORCS1 and SORCS3 act as intracellular trafficking receptors for tropomyosin-related kinase B (TrkB) in arcuate nucleus neurons to attenuate BDNF signaling. Loss of both receptors results in excessive production of the orexigenic neuropeptide AgRP and a chronic energy excess phenotype.","method":"Individual and dual receptor knockout mouse models, biochemical trafficking assays, neuropeptide measurement, metabolic phenotyping","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with dual KO and defined molecular pathway (TrkB trafficking), single lab; SORCS3 specific contribution not fully dissected from SORCS1","pmids":["29440124"],"is_preprint":false},{"year":2022,"finding":"SorCS3 co-localizes and physically interacts with p75NTR in GBM cells (confirmed by Co-IP and immunofluorescence), promotes endosomal-to-lysosomal trafficking of p75NTR leading to its degradation, thereby suppressing NGF/p75NTR signaling and inhibiting glioma cell invasion and proliferation.","method":"Co-immunoprecipitation, immunofluorescence co-localization, lysosomal trafficking assay, p75NTR protein level measurement, invasion/proliferation assays with SorCS3 knockdown/overexpression","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus localization plus functional degradation assay, single lab, single study","pmids":["35393432"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structure of full-length human SorCS3 revealed at least three distinct conformations in the apo state: monomer, M-shaped dimer, and N-shaped dimer. Differences between dimer conformations are caused by PKD1-2 domain assembly. Conserved residues GLN198, ARG678, TYR430, GLU1020, and ASP1024 were identified as key for dimerization and protein/polypeptide binding.","method":"Cryo-EM structure determination of full-length SorCS3","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Weak — cryo-EM structure at atomic detail with residue-level functional annotation; however, mutagenesis validation of the identified residues not described in abstract","pmids":["35940132"],"is_preprint":false},{"year":2025,"finding":"SorCS3 enhances endocytosis in adrenocortical carcinoma cells and physically or indirectly interacts with IGF2R (Insulin-like growth factor 2 receptor) as shown by Co-IP. SorCS3 overexpression increases IGF2R protein levels and suppresses PI3K/Akt and MAPK/Erk signaling; blocking endocytosis partially reverses these effects, supporting a receptor trafficking-dependent tumor-suppressive mechanism.","method":"Co-immunoprecipitation, immunofluorescence (early endosome co-localization), western blotting for signaling intermediates, endocytosis blocking experiment, overexpression/knockdown functional assays","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP interaction plus trafficking assay plus rescue-by-blockade experiment; single lab, single study","pmids":["41121295"],"is_preprint":false},{"year":2025,"finding":"Knockout of Sorcs3 in murine embryonic stem cells activates a totipotent-like state associated with activation of the Tfap2c gene and inhibition of TGF-β, PI3K-AKT, and lysosome pathways; deletion of Tfap2c in SKO-ESCs abolished this totipotent potential.","method":"CRISPR/Cas9 knockout, single-cell transcriptomics, Tfap2c double-knockout epistasis, blastocyst-like assembly assay, pathway inhibitor validation","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis (double KO rescue) plus single-cell transcriptomics plus inhibitor validation; single lab, non-neuronal context","pmids":["41178446"],"is_preprint":false}],"current_model":"SORCS3 is a VPS10-domain transmembrane sorting receptor that localizes to postsynaptic densities and vesicular compartments in neurons, where it controls glutamate (AMPA) receptor trafficking and positioning via interactions with postsynaptic adaptor proteins PICK1 and PSD-95, regulates long-term synaptic depression, and more broadly functions as an intracellular trafficking receptor that directs cargo (including TrkB, p75NTR, and IGF2R) from endosomes to lysosomes for degradation, thereby attenuating growth factor and neurotrophin signaling; its dimerization state is regulated by glycosylation, and its cytoplasmic tail mediates AP-2-dependent endocytosis."},"narrative":{"mechanistic_narrative":"SORCS3 is a VPS10-domain type-I transmembrane sorting receptor that governs intracellular trafficking and synaptic receptor positioning in neurons [PMID:10600506, PMID:24069373]. It is synthesized as a proprotein matured by N-terminal propeptide cleavage in the distal Golgi and binds neurotrophin ligand NGF through its extracellular VPS10 domain [PMID:15710408]. Its cytoplasmic tail carries canonical endocytic motifs that target the receptor to the Golgi and vesicular compartments and drive AP-2-dependent internalization, localizing the receptor to somatic and dendritic vesicles in neurons [PMID:10600506, PMID:24715575]. At the postsynaptic density SORCS3 functionally interacts with the adaptor PICK1 (and PSD-95) to control glutamate (AMPA) receptor trafficking; its loss abrogates long-term depression, mislocalizes PICK1, reduces basal synaptic transmission, and increases postsynaptic AMPA receptor mobility [PMID:24069373, PMID:27935149]. More broadly, SORCS3 acts as a trafficking receptor that routes growth-factor and neurotrophin receptors—TrkB, p75NTR, and IGF2R—from endosomes toward lysosomal degradation, thereby attenuating BDNF, NGF/p75NTR, and PI3K/Akt and MAPK/Erk signaling, with consequences for energy homeostasis and tumor cell invasion and proliferation [PMID:29440124, PMID:35393432, PMID:41121295]. Structurally, the extracellular region exists in a glycosylation-regulated equilibrium of monomers and homodimers, and cryo-EM resolves monomeric, M-shaped, and N-shaped conformations whose dimer geometry depends on PKD1-2 domain assembly [PMID:28827148, PMID:35940132].","teleology":[{"year":1999,"claim":"Established SORCS3 as a distinct VPS10-domain receptor and predicted, from its domain architecture, that it could function in rapid internalization and signaling.","evidence":"Molecular cloning, sequence and domain analysis identifying VPS10 domain, leucine-rich repeats, transmembrane domain, and a short cytoplasmic tail with internalization and SH2/SH3 motifs","pmids":["10600506"],"confidence":"Medium","gaps":["No functional mutagenesis of the predicted internalization or SH2/SH3 motifs","Ligands and trafficking behavior not yet tested"]},{"year":2000,"claim":"Revealed that alternative splicing can produce a SORCS3 isoform with an identical ectodomain but a divergent cytoplasmic tail lacking sorting signals, implying tail-dependent control of trafficking fate.","evidence":"RT-PCR and cDNA cloning of a splice variant","pmids":["10760602"],"confidence":"Medium","gaps":["Functional consequences of the divergent tail not validated","Relative expression and tissue distribution of isoforms unknown"]},{"year":2004,"claim":"Linked SORCS3 to neuronal activity by showing its hippocampal expression is induced by seizure activity independently of new protein synthesis, distinguishing it from SorCS1.","evidence":"In situ hybridization in a kainic acid seizure model with protein synthesis inhibitor controls","pmids":["15009648"],"confidence":"Medium","gaps":["Mechanism coupling activity to expression not defined","Functional role of induced receptor not tested"]},{"year":2005,"claim":"Defined SORCS3 maturation and its first ligand, showing it is processed by propeptide cleavage in the Golgi, resides predominantly at the plasma membrane, and binds NGF.","evidence":"Pulse-chase processing assay, purified-receptor ligand binding, and subcellular localization in transfected cells","pmids":["15710408"],"confidence":"High","gaps":["Reported slow internalization conflicts with later AP-2-dependent endocytosis data","Physiological consequence of NGF binding not established"]},{"year":2013,"claim":"Placed SORCS3 at the postsynaptic density as a required regulator of long-term depression and glutamate receptor trafficking via PICK1.","evidence":"Knockout mice with LTD electrophysiology, PSD fractionation, targeted proteomics identifying PICK1, and fear extinction behavior","pmids":["24069373"],"confidence":"High","gaps":["Direct biochemical mode of PICK1 interaction not resolved","AMPA receptor cargo handling inferred rather than directly tracked"]},{"year":2014,"claim":"Showed the cytoplasmic domain alone determines Golgi/vesicular targeting and drives AP-2-dependent endocytosis, assigning the trafficking determinants to the receptor tail.","evidence":"Chimeric receptor expression, AP-2 co-localization, and endocytic motif analysis in neurons","pmids":["24715575"],"confidence":"Medium","gaps":["Single lab; specific motif residues not exhaustively mapped","Reconciliation with earlier slow-internalization observation incomplete"]},{"year":2017,"claim":"Connected SORCS3 loss to defective synaptic dynamics, showing reduced basal transmission, enhanced facilitation, and impaired depression consistent with increased postsynaptic AMPA receptor mobility, and reinforced PSD-95/PICK1 association.","evidence":"Patch-clamp and field recordings on knockout brain slices with multiple stimulation protocols, plus immunohistochemistry","pmids":["27935149"],"confidence":"High","gaps":["AMPA receptor mobility inferred from physiology, not directly imaged","Quantitative receptor stoichiometry at the PSD not established"]},{"year":2017,"claim":"Established that the SORCS3 ectodomain self-associates and that glycosylation tunes the monomer-dimer equilibrium, introducing oligomeric state as a regulatory layer.","evidence":"Purified-protein electron microscopy, reciprocal Co-IP from membranes, and enzymatic deglycosylation","pmids":["28827148"],"confidence":"High","gaps":["Functional consequence of dimerization for ligand sorting unresolved","In vivo regulation of glycosylation state unknown"]},{"year":2018,"claim":"Demonstrated SORCS3 (with SORCS1) functions as an intracellular trafficking receptor for TrkB to attenuate BDNF signaling, linking the receptor to energy homeostasis.","evidence":"Single and dual knockout mice, biochemical trafficking assays, neuropeptide and metabolic phenotyping","pmids":["29440124"],"confidence":"Medium","gaps":["SORCS3-specific contribution not fully separated from SORCS1","Direct TrkB binding interface not mapped"]},{"year":2022,"claim":"Extended the trafficking-receptor model to p75NTR, showing SORCS3 routes it to lysosomes to suppress NGF/p75NTR signaling and glioma invasion.","evidence":"Reciprocal Co-IP, immunofluorescence co-localization, lysosomal trafficking and degradation assays, and invasion/proliferation assays with knockdown/overexpression in GBM cells","pmids":["35393432"],"confidence":"Medium","gaps":["Single lab and single tumor context","Whether interaction is direct via the VPS10 domain not defined"]},{"year":2022,"claim":"Provided atomic structures of full-length SORCS3, resolving monomeric and two distinct dimeric conformations and nominating residues for dimerization and polypeptide binding.","evidence":"Cryo-EM structure determination of full-length human SorCS3","pmids":["35940132"],"confidence":"High","gaps":["Mutagenesis validation of the nominated residues not described","Functional state of each conformation in cells unknown"]},{"year":2025,"claim":"Generalized the endocytic, signaling-attenuating role to IGF2R, showing SORCS3 increases IGF2R levels and dampens PI3K/Akt and MAPK/Erk signaling in an endocytosis-dependent, tumor-suppressive manner.","evidence":"Co-IP, endosome co-localization, signaling western blots, and endocytosis-blockade rescue in adrenocortical carcinoma cells","pmids":["41121295"],"confidence":"Medium","gaps":["Direct versus indirect IGF2R interaction unresolved","Single lab and single cancer context"]},{"year":2025,"claim":"Revealed a non-neuronal role in cell fate, where loss of SORCS3 in embryonic stem cells activates a totipotent-like state via Tfap2c and suppression of TGF-β, PI3K-AKT, and lysosome pathways.","evidence":"CRISPR knockout, single-cell transcriptomics, Tfap2c double-knockout epistasis, blastocyst-like assembly, and pathway inhibitor validation","pmids":["41178446"],"confidence":"Medium","gaps":["Mechanistic link between SORCS3 trafficking and Tfap2c activation unclear","Direct cargo responsible for the fate change not identified"]},{"year":null,"claim":"How SORCS3 cargo selectivity is determined and how its conformational/oligomeric states map to specific trafficking outcomes (lysosomal degradation versus synaptic positioning) remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No direct binding interface mapped for TrkB, p75NTR, or IGF2R","Functional role of monomer versus dimer conformations in cargo sorting untested","Mechanistic bridge between trafficking activity and stem-cell fate undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[3,8,9,11]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[4,6]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,5]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[3,5]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[5]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[9,11]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[9]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[5,8,9,11]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[5,11]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[4,6]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8,9,11]}],"complexes":[],"partners":["PICK1","PSD-95","AP-2","TRKB","P75NTR","IGF2R","SORCS1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UPU3","full_name":"VPS10 domain-containing receptor SorCS3","aliases":[],"length_aa":1222,"mass_kda":135.8,"function":"Plays an important role in modulating synaptic transmission and plasticity in the hippocampus, probably by affecting the trafficking and localization ofAMPA-type glutamate receptors in the postsynaptic density","subcellular_location":"Cell membrane; Synaptic cell membrane; Postsynaptic density","url":"https://www.uniprot.org/uniprotkb/Q9UPU3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SORCS3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SORCS3","total_profiled":1310},"omim":[{"mim_id":"613162","title":"SPASTIC PARAPLEGIA 45, AUTOSOMAL RECESSIVE; SPG45","url":"https://www.omim.org/entry/613162"},{"mim_id":"606285","title":"SORTILIN-RELATED VPS10 DOMAIN-CONTAINING RECEPTOR 3; SORCS3","url":"https://www.omim.org/entry/606285"},{"mim_id":"606284","title":"SORTILIN-RELATED VPS10 DOMAIN-CONTAINING RECEPTOR 2; SORCS2","url":"https://www.omim.org/entry/606284"},{"mim_id":"606283","title":"SORTILIN-RELATED VPS10 DOMAIN-CONTAINING RECEPTOR 1; SORCS1","url":"https://www.omim.org/entry/606283"},{"mim_id":"602458","title":"SORTILIN; SORT1","url":"https://www.omim.org/entry/602458"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":7.5},{"tissue":"pituitary gland","ntpm":2.3}],"url":"https://www.proteinatlas.org/search/SORCS3"},"hgnc":{"alias_symbol":["KIAA1059","SORCS"],"prev_symbol":[]},"alphafold":{"accession":"Q9UPU3","domains":[{"cath_id":"-","chopping":"702-748","consensus_level":"medium","plddt":86.3017,"start":702,"end":748},{"cath_id":"3.30.60","chopping":"753-817","consensus_level":"high","plddt":85.9618,"start":753,"end":817},{"cath_id":"2.60.40.10","chopping":"823-912","consensus_level":"medium","plddt":85.871,"start":823,"end":912},{"cath_id":"3.30.70,3.30.70","chopping":"1000-1066_1074-1112","consensus_level":"medium","plddt":84.0028,"start":1000,"end":1112}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UPU3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UPU3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UPU3-F1-predicted_aligned_error_v6.png","plddt_mean":74.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SORCS3","jax_strain_url":"https://www.jax.org/strain/search?query=SORCS3"},"sequence":{"accession":"Q9UPU3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UPU3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UPU3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UPU3"}},"corpus_meta":[{"pmid":"24069373","id":"PMC_24069373","title":"Sortilin-related 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Study","date":"2024-09-04","source":"bioRxiv","url":"https://doi.org/10.1101/2024.09.04.24313052","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":12304,"output_tokens":3218,"usd":0.042591,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10744,"output_tokens":4235,"usd":0.079797,"stage2_stop_reason":"end_turn"},"total_usd":0.122388,"stage1_batch_id":"msgbatch_013LWZZT6MWaqB9qyTSeQBmU","stage2_batch_id":"msgbatch_0194ZzQaTGNpruoNJBbEMbt3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"SorCS3 (SorCS) was identified as a novel VPS10-domain receptor with an N-terminal VPS10 domain, leucine-rich repeats, a transmembrane domain, and a short intracellular C-terminus containing consensus signals for rapid internalization and putative SH2/SH3 binding motifs, distinct from other VPS10 family members.\",\n      \"method\": \"Molecular cloning, sequence analysis, domain identification\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — initial cloning and domain characterization across multiple sequence analyses in a single study; no functional mutagenesis\",\n      \"pmids\": [\"10600506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"An alternatively spliced transcript of SorCS3 was identified that encodes a protein with an identical extracellular/transmembrane region but a completely divergent cytoplasmic tail lacking canonical internalization or sorting signals.\",\n      \"method\": \"RT-PCR, cDNA cloning, sequence analysis of splice variant\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct molecular identification of splice variant; functional consequences not validated\",\n      \"pmids\": [\"10760602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SorCS3 expression in hippocampal neurons is upregulated by kainic acid-induced seizures in an activity-dependent manner that does not require de novo protein synthesis, distinguishing it from the related receptor SorCS1.\",\n      \"method\": \"In situ hybridization, kainic acid seizure model, protein synthesis inhibitor treatment\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct pharmacological dissection of activity-dependent expression regulation with inhibitor controls, single lab\",\n      \"pmids\": [\"15009648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SorCS3 is synthesized as a proprotein and undergoes N-terminal propeptide cleavage in distal Golgi compartments to produce its mature form. The propeptide is not required for normal processing, does not prevent ligand binding, and the receptor predominantly localizes to the plasma membrane with slow internalization and no detectable intracellular trafficking activity. SorCS3 binds nerve growth factor (NGF) as a neurotrophin ligand.\",\n      \"method\": \"Cell transfection, pulse-chase processing assay, ligand-binding assay with purified receptor, subcellular fractionation/localization\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro ligand binding with purified receptor, biochemical processing assay, and localization experiments in a single study with multiple orthogonal methods\",\n      \"pmids\": [\"15710408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SORCS3 localizes to the postsynaptic density in hippocampal neurons and is required for NMDA receptor-dependent and -independent forms of long-term depression (LTD). Loss of SORCS3 abrogates LTD and causes faulty localization of the adaptor protein PICK1, suggesting that SORCS3 controls glutamate receptor trafficking at the postsynapse via functional interaction with PICK1.\",\n      \"method\": \"Gene-targeted knockout mice, electrophysiology (LTD recordings), immunofluorescence/postsynaptic density fractionation, targeted proteomics (interaction with PICK1), behavioral fear extinction assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (KO mouse + electrophysiology + proteomics interaction + subcellular localization + behavior) in a single rigorous study with well-defined phenotypic readouts\",\n      \"pmids\": [\"24069373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The SorCS3 cytoplasmic domain targets the receptor to the Golgi apparatus and vesicular structures, and conveys internalization through canonical endocytic motifs in an AP-2-dependent manner. In neurons, SorCS3 protein is localized to vesicles in the soma and dendrites.\",\n      \"method\": \"Chimeric receptor expression in neurons, live-cell imaging/immunofluorescence, AP-2 co-localization, endocytic motif mutagenesis (implied by domain swap experiments)\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with chimeric constructs, AP-2 dependency tested, single lab\",\n      \"pmids\": [\"24715575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SorCS3-deficient hippocampal CA1 neurons show reduced basal synaptic transmission (decreased fEPSP slopes), enhanced synaptic facilitation, and reduced synaptic depression during repetitive stimulation, consistent with increased mobility of postsynaptic AMPA receptors. SorCS3 was previously shown to interact with PSD-95 and PICK1 at the postsynaptic density.\",\n      \"method\": \"Electrophysiology on acute brain slices from Sorcs3 knockout mice, immunohistochemistry, patch-clamp recordings\",\n      \"journal\": \"Hippocampus\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rigorous electrophysiological characterization in KO model with multiple stimulation protocols and age groups, complemented by immunohistochemistry; replicates postsynaptic role established previously\",\n      \"pmids\": [\"27935149\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SorCS3 extracellular domains form stable homodimers and monomers co-existing in equilibrium. Glycosylation regulates the oligomeric state: enzymatic deglycosylation promotes dimerization of monomers. Membrane-bound dimers were confirmed by co-immunoprecipitation from cell lysate.\",\n      \"method\": \"Biochemical purification, electron microscopy, co-immunoprecipitation, enzymatic deglycosylation\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — purified protein electron microscopy plus reciprocal Co-IP from cell membranes plus biochemical deglycosylation experiment, multiple orthogonal methods in one study\",\n      \"pmids\": [\"28827148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SORCS1 and SORCS3 act as intracellular trafficking receptors for tropomyosin-related kinase B (TrkB) in arcuate nucleus neurons to attenuate BDNF signaling. Loss of both receptors results in excessive production of the orexigenic neuropeptide AgRP and a chronic energy excess phenotype.\",\n      \"method\": \"Individual and dual receptor knockout mouse models, biochemical trafficking assays, neuropeptide measurement, metabolic phenotyping\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with dual KO and defined molecular pathway (TrkB trafficking), single lab; SORCS3 specific contribution not fully dissected from SORCS1\",\n      \"pmids\": [\"29440124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SorCS3 co-localizes and physically interacts with p75NTR in GBM cells (confirmed by Co-IP and immunofluorescence), promotes endosomal-to-lysosomal trafficking of p75NTR leading to its degradation, thereby suppressing NGF/p75NTR signaling and inhibiting glioma cell invasion and proliferation.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence co-localization, lysosomal trafficking assay, p75NTR protein level measurement, invasion/proliferation assays with SorCS3 knockdown/overexpression\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus localization plus functional degradation assay, single lab, single study\",\n      \"pmids\": [\"35393432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structure of full-length human SorCS3 revealed at least three distinct conformations in the apo state: monomer, M-shaped dimer, and N-shaped dimer. Differences between dimer conformations are caused by PKD1-2 domain assembly. Conserved residues GLN198, ARG678, TYR430, GLU1020, and ASP1024 were identified as key for dimerization and protein/polypeptide binding.\",\n      \"method\": \"Cryo-EM structure determination of full-length SorCS3\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Weak — cryo-EM structure at atomic detail with residue-level functional annotation; however, mutagenesis validation of the identified residues not described in abstract\",\n      \"pmids\": [\"35940132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SorCS3 enhances endocytosis in adrenocortical carcinoma cells and physically or indirectly interacts with IGF2R (Insulin-like growth factor 2 receptor) as shown by Co-IP. SorCS3 overexpression increases IGF2R protein levels and suppresses PI3K/Akt and MAPK/Erk signaling; blocking endocytosis partially reverses these effects, supporting a receptor trafficking-dependent tumor-suppressive mechanism.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence (early endosome co-localization), western blotting for signaling intermediates, endocytosis blocking experiment, overexpression/knockdown functional assays\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP interaction plus trafficking assay plus rescue-by-blockade experiment; single lab, single study\",\n      \"pmids\": [\"41121295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Knockout of Sorcs3 in murine embryonic stem cells activates a totipotent-like state associated with activation of the Tfap2c gene and inhibition of TGF-β, PI3K-AKT, and lysosome pathways; deletion of Tfap2c in SKO-ESCs abolished this totipotent potential.\",\n      \"method\": \"CRISPR/Cas9 knockout, single-cell transcriptomics, Tfap2c double-knockout epistasis, blastocyst-like assembly assay, pathway inhibitor validation\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis (double KO rescue) plus single-cell transcriptomics plus inhibitor validation; single lab, non-neuronal context\",\n      \"pmids\": [\"41178446\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SORCS3 is a VPS10-domain transmembrane sorting receptor that localizes to postsynaptic densities and vesicular compartments in neurons, where it controls glutamate (AMPA) receptor trafficking and positioning via interactions with postsynaptic adaptor proteins PICK1 and PSD-95, regulates long-term synaptic depression, and more broadly functions as an intracellular trafficking receptor that directs cargo (including TrkB, p75NTR, and IGF2R) from endosomes to lysosomes for degradation, thereby attenuating growth factor and neurotrophin signaling; its dimerization state is regulated by glycosylation, and its cytoplasmic tail mediates AP-2-dependent endocytosis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SORCS3 is a VPS10-domain type-I transmembrane sorting receptor that governs intracellular trafficking and synaptic receptor positioning in neurons [#0, #4]. It is synthesized as a proprotein matured by N-terminal propeptide cleavage in the distal Golgi and binds neurotrophin ligand NGF through its extracellular VPS10 domain [#3]. Its cytoplasmic tail carries canonical endocytic motifs that target the receptor to the Golgi and vesicular compartments and drive AP-2-dependent internalization, localizing the receptor to somatic and dendritic vesicles in neurons [#0, #5]. At the postsynaptic density SORCS3 functionally interacts with the adaptor PICK1 (and PSD-95) to control glutamate (AMPA) receptor trafficking; its loss abrogates long-term depression, mislocalizes PICK1, reduces basal synaptic transmission, and increases postsynaptic AMPA receptor mobility [#4, #6]. More broadly, SORCS3 acts as a trafficking receptor that routes growth-factor and neurotrophin receptors\\u2014TrkB, p75NTR, and IGF2R\\u2014from endosomes toward lysosomal degradation, thereby attenuating BDNF, NGF/p75NTR, and PI3K/Akt and MAPK/Erk signaling, with consequences for energy homeostasis and tumor cell invasion and proliferation [#8, #9, #11]. Structurally, the extracellular region exists in a glycosylation-regulated equilibrium of monomers and homodimers, and cryo-EM resolves monomeric, M-shaped, and N-shaped conformations whose dimer geometry depends on PKD1-2 domain assembly [#7, #10].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established SORCS3 as a distinct VPS10-domain receptor and predicted, from its domain architecture, that it could function in rapid internalization and signaling.\",\n      \"evidence\": \"Molecular cloning, sequence and domain analysis identifying VPS10 domain, leucine-rich repeats, transmembrane domain, and a short cytoplasmic tail with internalization and SH2/SH3 motifs\",\n      \"pmids\": [\"10600506\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional mutagenesis of the predicted internalization or SH2/SH3 motifs\", \"Ligands and trafficking behavior not yet tested\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Revealed that alternative splicing can produce a SORCS3 isoform with an identical ectodomain but a divergent cytoplasmic tail lacking sorting signals, implying tail-dependent control of trafficking fate.\",\n      \"evidence\": \"RT-PCR and cDNA cloning of a splice variant\",\n      \"pmids\": [\"10760602\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequences of the divergent tail not validated\", \"Relative expression and tissue distribution of isoforms unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Linked SORCS3 to neuronal activity by showing its hippocampal expression is induced by seizure activity independently of new protein synthesis, distinguishing it from SorCS1.\",\n      \"evidence\": \"In situ hybridization in a kainic acid seizure model with protein synthesis inhibitor controls\",\n      \"pmids\": [\"15009648\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism coupling activity to expression not defined\", \"Functional role of induced receptor not tested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined SORCS3 maturation and its first ligand, showing it is processed by propeptide cleavage in the Golgi, resides predominantly at the plasma membrane, and binds NGF.\",\n      \"evidence\": \"Pulse-chase processing assay, purified-receptor ligand binding, and subcellular localization in transfected cells\",\n      \"pmids\": [\"15710408\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reported slow internalization conflicts with later AP-2-dependent endocytosis data\", \"Physiological consequence of NGF binding not established\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Placed SORCS3 at the postsynaptic density as a required regulator of long-term depression and glutamate receptor trafficking via PICK1.\",\n      \"evidence\": \"Knockout mice with LTD electrophysiology, PSD fractionation, targeted proteomics identifying PICK1, and fear extinction behavior\",\n      \"pmids\": [\"24069373\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical mode of PICK1 interaction not resolved\", \"AMPA receptor cargo handling inferred rather than directly tracked\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed the cytoplasmic domain alone determines Golgi/vesicular targeting and drives AP-2-dependent endocytosis, assigning the trafficking determinants to the receptor tail.\",\n      \"evidence\": \"Chimeric receptor expression, AP-2 co-localization, and endocytic motif analysis in neurons\",\n      \"pmids\": [\"24715575\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; specific motif residues not exhaustively mapped\", \"Reconciliation with earlier slow-internalization observation incomplete\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected SORCS3 loss to defective synaptic dynamics, showing reduced basal transmission, enhanced facilitation, and impaired depression consistent with increased postsynaptic AMPA receptor mobility, and reinforced PSD-95/PICK1 association.\",\n      \"evidence\": \"Patch-clamp and field recordings on knockout brain slices with multiple stimulation protocols, plus immunohistochemistry\",\n      \"pmids\": [\"27935149\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"AMPA receptor mobility inferred from physiology, not directly imaged\", \"Quantitative receptor stoichiometry at the PSD not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established that the SORCS3 ectodomain self-associates and that glycosylation tunes the monomer-dimer equilibrium, introducing oligomeric state as a regulatory layer.\",\n      \"evidence\": \"Purified-protein electron microscopy, reciprocal Co-IP from membranes, and enzymatic deglycosylation\",\n      \"pmids\": [\"28827148\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of dimerization for ligand sorting unresolved\", \"In vivo regulation of glycosylation state unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated SORCS3 (with SORCS1) functions as an intracellular trafficking receptor for TrkB to attenuate BDNF signaling, linking the receptor to energy homeostasis.\",\n      \"evidence\": \"Single and dual knockout mice, biochemical trafficking assays, neuropeptide and metabolic phenotyping\",\n      \"pmids\": [\"29440124\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"SORCS3-specific contribution not fully separated from SORCS1\", \"Direct TrkB binding interface not mapped\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended the trafficking-receptor model to p75NTR, showing SORCS3 routes it to lysosomes to suppress NGF/p75NTR signaling and glioma invasion.\",\n      \"evidence\": \"Reciprocal Co-IP, immunofluorescence co-localization, lysosomal trafficking and degradation assays, and invasion/proliferation assays with knockdown/overexpression in GBM cells\",\n      \"pmids\": [\"35393432\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab and single tumor context\", \"Whether interaction is direct via the VPS10 domain not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided atomic structures of full-length SORCS3, resolving monomeric and two distinct dimeric conformations and nominating residues for dimerization and polypeptide binding.\",\n      \"evidence\": \"Cryo-EM structure determination of full-length human SorCS3\",\n      \"pmids\": [\"35940132\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mutagenesis validation of the nominated residues not described\", \"Functional state of each conformation in cells unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Generalized the endocytic, signaling-attenuating role to IGF2R, showing SORCS3 increases IGF2R levels and dampens PI3K/Akt and MAPK/Erk signaling in an endocytosis-dependent, tumor-suppressive manner.\",\n      \"evidence\": \"Co-IP, endosome co-localization, signaling western blots, and endocytosis-blockade rescue in adrenocortical carcinoma cells\",\n      \"pmids\": [\"41121295\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect IGF2R interaction unresolved\", \"Single lab and single cancer context\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed a non-neuronal role in cell fate, where loss of SORCS3 in embryonic stem cells activates a totipotent-like state via Tfap2c and suppression of TGF-\\u03b2, PI3K-AKT, and lysosome pathways.\",\n      \"evidence\": \"CRISPR knockout, single-cell transcriptomics, Tfap2c double-knockout epistasis, blastocyst-like assembly, and pathway inhibitor validation\",\n      \"pmids\": [\"41178446\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between SORCS3 trafficking and Tfap2c activation unclear\", \"Direct cargo responsible for the fate change not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How SORCS3 cargo selectivity is determined and how its conformational/oligomeric states map to specific trafficking outcomes (lysosomal degradation versus synaptic positioning) remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct binding interface mapped for TrkB, p75NTR, or IGF2R\", \"Functional role of monomer versus dimer conformations in cargo sorting untested\", \"Mechanistic bridge between trafficking activity and stem-cell fate undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [3, 8, 9, 11]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [4, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [9, 11]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [5, 8, 9, 11]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [5, 11]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [4, 6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 9, 11]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PICK1\", \"PSD-95\", \"AP-2\", \"TrkB\", \"p75NTR\", \"IGF2R\", \"SORCS1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}