{"gene":"SORT1","run_date":"2026-06-10T07:46:38","timeline":{"discoveries":[{"year":1998,"finding":"Sortilin (gp95/SORT1) was cloned from human brain cDNA and identified as the 100-kDa neurotensin receptor (NT3 receptor). The mature form arises by furin cleavage of the pro-protein, converting the 110-kDa precursor to a higher-affinity 100-kDa receptor (Kd ~0.3 nM). The protein localizes to intracellular vesicles. It is the first transmembrane neuropeptide receptor not belonging to the G-protein-coupled receptor superfamily.","method":"COS-7 cell transfection with cloned cDNA, saturable binding assays with iodinated neurotensin, co-transfection with furin, affinity labeling, immunolocalization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct binding reconstitution in transfected cells, furin co-transfection demonstrating cleavage-dependent affinity shift, multiple orthogonal methods in one study","pmids":["9756851"],"is_preprint":false},{"year":2010,"finding":"Sortilin (encoded by SORT1) regulates plasma LDL cholesterol and VLDL particle levels by modulating hepatic VLDL secretion. siRNA knockdown of Sort1 in mouse liver reduced plasma LDL-C and VLDL, while viral overexpression increased them. The causal noncoding SNP rs12740374 creates a C/EBP transcription factor binding site that increases hepatic SORT1 expression.","method":"siRNA knockdown and adenoviral overexpression in mouse liver, plasma lipid measurements, VLDL secretion assays, human cohort expression QTL analysis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — bidirectional loss- and gain-of-function in vivo, replicated in human cohorts, multiple orthogonal methods","pmids":["20686566"],"is_preprint":false},{"year":2010,"finding":"Sortilin acts as an intracellular sorting receptor for apolipoprotein B100 (apoB100). It interacts with apoB100 in the Golgi and facilitates formation and hepatic export of apoB100-containing lipoproteins, thereby regulating plasma LDL cholesterol. Sortilin-deficient mice show reduced lipoprotein secretion and ameliorated hypercholesterolemia; sortilin overexpression stimulates hepatic lipoprotein release.","method":"Co-immunoprecipitation of sortilin with apoB100, gene-targeted knockout mice, sortilin overexpression in liver, plasma LDL/atherosclerosis measurements","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP identifying apoB100 as binding partner, bidirectional genetic manipulation in vivo with lipid phenotype, replicated across labs","pmids":["20816088"],"is_preprint":false},{"year":2014,"finding":"Sortilin is a high-affinity sorting receptor for PCSK9 in the trans-Golgi network and facilitates PCSK9 secretion from hepatocytes. Sortilin-deficient mice have decreased circulating PCSK9 levels; sortilin overexpression in liver increases plasma PCSK9. Circulating PCSK9 and sortilin levels are positively correlated in a human cohort.","method":"Co-localization of sortilin with PCSK9 in TGN, binding assays, sortilin-knockout mice, sortilin overexpression in liver, ELISA of plasma PCSK9, human cohort correlation","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding and colocalization in TGN, bidirectional genetic manipulation in vivo, validated in human cohort","pmids":["24506872"],"is_preprint":false},{"year":2015,"finding":"TDP-43 functions within a network of hnRNP proteins (including hnRNP L, PTB/nPTB, and hnRNP A1/A2) to suppress inclusion of exon 17b in SORT1 mRNA, thereby preventing production of a truncated sortilin receptor. Loss of TDP-43 function (as in FTLD-TDP) combined with altered expression of hnRNP A1/A2 and PTB/nPTB leads to aberrant SORT1 splicing.","method":"RNA-binding protein knockdown/overexpression, minigene splicing assays, analysis of FTLD-TDP patient tissue for hnRNP expression changes","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional splicing assays with multiple RNA-binding proteins, validated in patient tissue, single lab","pmids":["26614389"],"is_preprint":false},{"year":2015,"finding":"A disease-segregating SORT1 missense mutation (p.Gly171Ala) impairs sortilin protein expression and also reduces mRNA levels of its binding partner p75 neurotrophin receptor (p75NTR), linking sortilin to p75NTR-mediated neuronal apoptosis pathways in an essential tremor family.","method":"Whole exome sequencing, mutagenesis, cell culture expression assays, ELISA, apoptosis assays","journal":"ASN neuro","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — mutagenesis and cell-based functional assays in single study, single lab","pmids":["26297037"],"is_preprint":false},{"year":2018,"finding":"Progranulin derived from Purkinje cells acts retrogradely onto its putative receptor Sort1 on climbing fibers to strengthen developing climbing fiber synaptic inputs and counteract synapse elimination in the neonatal cerebellum (postnatal days 11–16). This progranulin-Sort1 retrograde signaling is independent of semaphorin 3A signaling.","method":"Genetic loss-of-function (Sort1 conditional knockout), electrophysiological recordings of CF-PC synapses, in vivo cerebellar circuit analysis, epistasis with semaphorin 3A pathway","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean conditional KO with defined electrophysiological and circuit phenotype, genetic epistasis establishing pathway independence, multiple orthogonal methods","pmids":["29398357"],"is_preprint":false},{"year":2017,"finding":"The rs12740374 minor allele sequence in the SORT1 locus enhances hepatic SORT1 expression. CRISPR-Cas9 targeting of this allele in primary human hepatocytes ex vivo and in locus-humanized mice in vivo reproducibly reduced SORT1 expression, establishing the noncoding variant as a causal regulatory element for SORT1 transcription in hepatocytes.","method":"CRISPR-Cas9 allele-specific editing in primary human hepatocytes and locus-humanized transgenic mice, quantitative SORT1 mRNA measurements","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — allele-specific CRISPR-Cas9 editing with functional readout in two independent model systems (human primary cells and humanized mice)","pmids":["29097363"],"is_preprint":false},{"year":2012,"finding":"Sortilin on the cell surface binds and internalizes LDL via receptor-mediated endocytosis. A mutant sortilin retained predominantly at the cell surface bound very high amounts of LDL, indicating that the cell-surface pool—not an intracellular mechanism—mediates LDL binding. However, SORT1 missense mutations did not substantially alter LDL binding, and SORT1 mutations are unlikely to cause autosomal dominant hypercholesterolemia.","method":"Transfection of wild-type and mutant SORT1 constructs in HeLa T-REx cells, siRNA knockdown, cell-surface LDL binding and internalization assays","journal":"Atherosclerosis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple mutants tested in cell-based assays, bidirectional manipulation (overexpression and siRNA), but single lab","pmids":["23102784"],"is_preprint":false},{"year":2018,"finding":"SORT1 and LAMP2 are key regulators of extracellular vesicle (EV) secretion in lenalidomide-resistant multiple myeloma cells. Silencing of SORT1 decreased EV secretion and cell adhesion in resistant cells, restoring sensitivity to lenalidomide.","method":"Whole-transcriptome analysis, siRNA silencing of SORT1 and LAMP2, EV secretion quantification, cell adhesion assays, drug sensitivity assays","journal":"Blood advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional siRNA knockdown with defined EV secretion and drug-resistance phenotype, multiple readouts, single lab","pmids":["34979567"],"is_preprint":false},{"year":2018,"finding":"SORT1 receptor mediates internalization of a peptide-drug conjugate (TH1902/TH1904) in triple-negative breast cancer and ovarian cancer cells. SORT1 gene silencing or antibodies directed against its extracellular domain inhibited capillary-like structure (vasculogenic mimicry) formation, demonstrating that SORT1 itself plays a functional role in vasculogenic mimicry.","method":"siRNA-mediated SORT1 silencing, competitive inhibition with SORT1 ligands, fluorescent peptide cellular uptake assays, 3D capillary-like structure formation assays, in vivo xenograft models","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA loss-of-function with defined phenotypic readout, confirmed in vivo, single lab","pmids":["34751242"],"is_preprint":false},{"year":2018,"finding":"SORT1-targeted peptide-drug conjugate TH1902 is internalized via SORT1 receptor-mediated uptake in cancer stem cells. siRNA repression of SORT1 inhibited uptake of the fluorescent Alexa488-peptide, and competition with SORT1 ligands also blocked uptake, confirming SORT1-dependent internalization.","method":"siRNA knockdown, ligand competition assays, fluorescent peptide uptake imaging, flow cytometry, in vivo xenograft","journal":"Pharmaceutics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA and competition-based confirmation of receptor-mediated uptake, in vivo validation, single lab","pmids":["36145658"],"is_preprint":false},{"year":2018,"finding":"SORT1 rare nonsynonymous variants, particularly in the β-propeller domain and the predicted GRN (granulin/progranulin) binding site, are enriched in frontotemporal dementia (FTD) patients, establishing SORT1 as a genetic risk factor for FTD and implicating the GRN-binding region of sortilin in FTD pathogenesis.","method":"Whole-exome sequencing, rare variant burden analysis in multiple European patient/control cohorts, meta-analysis","journal":"Neurobiology of aging","confidence":"Low","confidence_rationale":"Tier 4 / Moderate — genetic association/burden analysis without direct biochemical functional validation of individual variants","pmids":["29555433"],"is_preprint":false}],"current_model":"Sortilin (SORT1) is a type-I transmembrane sorting receptor that localizes to the trans-Golgi network and interacts with apolipoprotein B100 to facilitate hepatic VLDL/LDL secretion, acts as a high-affinity sorting receptor for PCSK9 to promote its secretion, mediates neurotensin binding as a non-G-protein-coupled receptor, is subject to furin cleavage that converts it to a higher-affinity mature form, regulates extracellular vesicle secretion via LAMP2 co-regulation, participates in progranulin retrograde signaling onto Sort1-expressing climbing fibers to counteract cerebellar synapse elimination, and undergoes TDP-43/hnRNP-regulated alternative splicing of exon 17b that controls production of a truncated isoform relevant to neurodegeneration."},"narrative":{"mechanistic_narrative":"SORT1 encodes sortilin, a type-I transmembrane sorting receptor that governs the intracellular trafficking and secretion of multiple ligands and was originally identified as the 100-kDa neurotensin receptor, the first transmembrane neuropeptide receptor outside the G-protein-coupled receptor superfamily [PMID:9756851]. Sortilin matures by furin cleavage of a 110-kDa precursor into a higher-affinity 100-kDa form [PMID:9756851]. In the liver, sortilin is a central regulator of plasma cholesterol: it binds apolipoprotein B100 in the Golgi to facilitate assembly and hepatic export of apoB100-containing lipoproteins [PMID:20816088], and acts as a high-affinity trans-Golgi network sorting receptor for PCSK9 to promote its secretion [PMID:24506872]. Hepatic SORT1 expression is itself set by a causal noncoding regulatory variant (rs12740374) that creates a C/EBP binding site, with allele-specific CRISPR editing in primary hepatocytes and humanized mice confirming the variant controls SORT1 transcription and downstream LDL/VLDL levels [PMID:20686566, PMID:29097363]. Beyond lipoprotein sorting, cell-surface sortilin binds and internalizes LDL by receptor-mediated endocytosis [PMID:23102784] and mediates uptake of SORT1-targeted peptide-drug conjugates in cancer cells [PMID:34751242, PMID:36145658]. In the nervous system, progranulin signals retrogradely onto Sort1 on cerebellar climbing fibers to strengthen developing synaptic inputs and counteract synapse elimination [PMID:29398357], and SORT1 mRNA is subject to TDP-43/hnRNP-regulated alternative splicing of exon 17b that controls production of a truncated sortilin isoform implicated in FTLD-TDP [PMID:26614389].","teleology":[{"year":1998,"claim":"Established the molecular identity of sortilin as a non-GPCR transmembrane neurotensin receptor and defined furin cleavage as the maturation step that confers high-affinity ligand binding.","evidence":"Cloning from human brain cDNA, saturable neurotensin binding in transfected COS-7 cells, furin co-transfection, affinity labeling and immunolocalization","pmids":["9756851"],"confidence":"High","gaps":["Did not address lipoprotein or PCSK9 sorting functions","Downstream signaling consequences of neurotensin binding not defined"]},{"year":2010,"claim":"Showed that hepatic sortilin causally controls plasma LDL/VLDL and identified the causal noncoding regulatory mechanism behind a major lipid GWAS locus.","evidence":"siRNA knockdown and adenoviral overexpression in mouse liver, VLDL secretion assays, human expression QTL analysis identifying rs12740374 creating a C/EBP site","pmids":["20686566"],"confidence":"High","gaps":["Direction of effect on secretion not fully reconciled across studies","Molecular cargo bound by sortilin not identified in this study"]},{"year":2010,"claim":"Identified apoB100 as a direct sortilin cargo, providing the molecular mechanism for sortilin's control of hepatic lipoprotein export.","evidence":"Reciprocal Co-IP of sortilin with apoB100, gene-targeted knockout and hepatic overexpression in mice with plasma LDL/atherosclerosis readouts","pmids":["20816088"],"confidence":"High","gaps":["Precise binding interface on apoB100/sortilin not mapped","Stoichiometry and Golgi trafficking itinerary not resolved"]},{"year":2012,"claim":"Distinguished a cell-surface endocytic pool of sortilin that binds and internalizes LDL from intracellular sorting, while showing SORT1 missense variants are unlikely to cause autosomal dominant hypercholesterolemia.","evidence":"Wild-type and surface-retained mutant SORT1 constructs in HeLa T-REx cells, siRNA knockdown, cell-surface LDL binding/internalization assays","pmids":["23102784"],"confidence":"Medium","gaps":["Single lab","Quantitative contribution of surface uptake versus secretory sorting to plasma LDL not established"]},{"year":2014,"claim":"Defined sortilin as a high-affinity TGN sorting receptor for PCSK9, linking it mechanistically to a second arm of cholesterol regulation.","evidence":"TGN colocalization and binding assays, sortilin-knockout and overexpression mice, plasma PCSK9 ELISA, human cohort correlation","pmids":["24506872"],"confidence":"High","gaps":["Binding interface not mapped at residue level","Whether sortilin escorts PCSK9 along a dedicated secretory route not defined"]},{"year":2015,"claim":"Revealed that TDP-43 and an hnRNP network suppress SORT1 exon 17b inclusion, connecting RNA-binding-protein dysfunction in FTLD-TDP to production of a truncated sortilin isoform.","evidence":"RNA-binding protein knockdown/overexpression, minigene splicing assays, analysis of FTLD-TDP patient tissue","pmids":["26614389"],"confidence":"Medium","gaps":["Functional consequence of the truncated isoform not biochemically characterized","Single lab"]},{"year":2015,"claim":"Implicated a SORT1 missense mutation in essential tremor by impairing sortilin expression and reducing its partner p75NTR, linking sortilin to neuronal apoptosis pathways.","evidence":"Whole exome sequencing in a family, mutagenesis, cell-based expression, ELISA, apoptosis assays","pmids":["26297037"],"confidence":"Medium","gaps":["Single family/single lab","Causality for the tremor phenotype not established beyond segregation"]},{"year":2017,"claim":"Provided causal proof that the rs12740374 noncoding allele drives hepatic SORT1 transcription, closing the loop from regulatory variant to gene expression.","evidence":"Allele-specific CRISPR-Cas9 editing in primary human hepatocytes and locus-humanized mice with quantitative SORT1 mRNA readout","pmids":["29097363"],"confidence":"High","gaps":["Effect quantified at mRNA level; protein and downstream lipid effects assessed indirectly","Transcription factor occupancy at the edited site not directly measured here"]},{"year":2018,"claim":"Established progranulin-Sort1 retrograde signaling as a developmental synaptic mechanism strengthening climbing-fiber inputs and counteracting synapse elimination, independent of semaphorin 3A.","evidence":"Sort1 conditional knockout, electrophysiology of CF-PC synapses, in vivo cerebellar circuit analysis, genetic epistasis with Sema3A","pmids":["29398357"],"confidence":"High","gaps":["Direct progranulin-sortilin binding not biochemically demonstrated in this study","Downstream signaling cascade in climbing fibers not defined"]},{"year":2018,"claim":"Showed sortilin functions in cancer biology, regulating extracellular vesicle secretion and drug resistance in myeloma and mediating receptor-dependent uptake driving vasculogenic mimicry in solid tumors.","evidence":"siRNA silencing of SORT1 (and LAMP2), EV secretion and adhesion assays, fluorescent peptide-drug-conjugate uptake, 3D capillary-formation assays, xenografts","pmids":["34979567","34751242","36145658"],"confidence":"Medium","gaps":["Mechanism coupling sortilin to EV biogenesis not resolved","Single-lab findings for each tumor context"]},{"year":2018,"claim":"Implicated SORT1 as a genetic risk factor for frontotemporal dementia, with variant enrichment in the β-propeller and predicted GRN-binding region.","evidence":"Whole-exome sequencing and rare-variant burden/meta-analysis in European cohorts","pmids":["29555433"],"confidence":"Low","gaps":["Genetic association without direct biochemical validation of individual variants","Effect of variants on GRN binding not experimentally tested"]},{"year":null,"claim":"How sortilin's distinct trafficking functions (apoB100/PCSK9 secretory sorting, surface LDL endocytosis, progranulin/neurotensin receptor signaling) are partitioned and regulated within a single cell remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model integrating multiple ligand-binding modes in the timeline","Mechanism switching sortilin between secretory and endocytic roles unknown","Functional consequence of the truncated splice isoform uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[2,3,8]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,6]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[2,3]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[8,10,11]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[1,2,3]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[2,3]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,6]}],"complexes":[],"partners":["APOB","PCSK9","GRN","NGFR","LAMP2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q99523","full_name":"Sortilin","aliases":["100 kDa NT receptor","Glycoprotein 95","Gp95","Neurotensin receptor 3","NT3","NTR3"],"length_aa":831,"mass_kda":92.1,"function":"Functions as a sorting receptor in the Golgi compartment and as a clearance receptor on the cell surface. Required for protein transport from the Golgi apparatus to the lysosomes by a pathway that is independent of the mannose-6-phosphate receptor (M6PR). Lysosomal proteins bind specifically to the receptor in the Golgi apparatus and the resulting receptor-ligand complex is transported to an acidic prelysosomal compartment where the low pH mediates the dissociation of the complex (PubMed:16787399). The receptor is then recycled back to the Golgi for another round of trafficking through its binding to the retromer. Also required for protein transport from the Golgi apparatus to the endosomes. Promotes neuronal apoptosis by mediating endocytosis of the proapoptotic precursor forms of BDNF (proBDNF) and NGFB (proNGFB). Also acts as a receptor for neurotensin. May promote mineralization of the extracellular matrix during osteogenic differentiation by scavenging extracellular LPL. Probably required in adipocytes for the formation of specialized storage vesicles containing the glucose transporter SLC2A4/GLUT4 (GLUT4 storage vesicles, or GSVs). These vesicles provide a stable pool of SLC2A4 and confer increased responsiveness to insulin. May also mediate transport from the endoplasmic reticulum to the Golgi","subcellular_location":"Golgi apparatus, Golgi stack membrane; Endosome membrane; Endoplasmic reticulum membrane; Nucleus membrane; Cell membrane; Lysosome membrane","url":"https://www.uniprot.org/uniprotkb/Q99523/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SORT1","classification":"Not Classified","n_dependent_lines":18,"n_total_lines":1208,"dependency_fraction":0.014900662251655629},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CANX","stoichiometry":0.2},{"gene":"CLTA","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/SORT1","total_profiled":1310},"omim":[{"mim_id":"613589","title":"LOW DENSITY LIPOPROTEIN CHOLESTEROL LEVEL QUANTITATIVE TRAIT LOCUS 6; LDLCQ6","url":"https://www.omim.org/entry/613589"},{"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":"605538","title":"NEUROTENSIN RECEPTOR 2; NTSR2","url":"https://www.omim.org/entry/605538"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Golgi apparatus","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SORT1"},"hgnc":{"alias_symbol":["Gp95","NT3"],"prev_symbol":[]},"alphafold":{"accession":"Q99523","domains":[{"cath_id":"2.10.70.80","chopping":"615-667","consensus_level":"medium","plddt":96.3932,"start":615,"end":667},{"cath_id":"3.30.60.270","chopping":"674-746","consensus_level":"high","plddt":87.7603,"start":674,"end":746},{"cath_id":"2.40.128","chopping":"110-212","consensus_level":"medium","plddt":90.8236,"start":110,"end":212}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q99523","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q99523-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q99523-F1-predicted_aligned_error_v6.png","plddt_mean":82.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SORT1","jax_strain_url":"https://www.jax.org/strain/search?query=SORT1"},"sequence":{"accession":"Q99523","fasta_url":"https://rest.uniprot.org/uniprotkb/Q99523.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q99523/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q99523"}},"corpus_meta":[{"pmid":"20686566","id":"PMC_20686566","title":"From 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The mature form arises by furin cleavage of the pro-protein, converting the 110-kDa precursor to a higher-affinity 100-kDa receptor (Kd ~0.3 nM). The protein localizes to intracellular vesicles. It is the first transmembrane neuropeptide receptor not belonging to the G-protein-coupled receptor superfamily.\",\n      \"method\": \"COS-7 cell transfection with cloned cDNA, saturable binding assays with iodinated neurotensin, co-transfection with furin, affinity labeling, immunolocalization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct binding reconstitution in transfected cells, furin co-transfection demonstrating cleavage-dependent affinity shift, multiple orthogonal methods in one study\",\n      \"pmids\": [\"9756851\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Sortilin (encoded by SORT1) regulates plasma LDL cholesterol and VLDL particle levels by modulating hepatic VLDL secretion. siRNA knockdown of Sort1 in mouse liver reduced plasma LDL-C and VLDL, while viral overexpression increased them. The causal noncoding SNP rs12740374 creates a C/EBP transcription factor binding site that increases hepatic SORT1 expression.\",\n      \"method\": \"siRNA knockdown and adenoviral overexpression in mouse liver, plasma lipid measurements, VLDL secretion assays, human cohort expression QTL analysis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — bidirectional loss- and gain-of-function in vivo, replicated in human cohorts, multiple orthogonal methods\",\n      \"pmids\": [\"20686566\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Sortilin acts as an intracellular sorting receptor for apolipoprotein B100 (apoB100). It interacts with apoB100 in the Golgi and facilitates formation and hepatic export of apoB100-containing lipoproteins, thereby regulating plasma LDL cholesterol. Sortilin-deficient mice show reduced lipoprotein secretion and ameliorated hypercholesterolemia; sortilin overexpression stimulates hepatic lipoprotein release.\",\n      \"method\": \"Co-immunoprecipitation of sortilin with apoB100, gene-targeted knockout mice, sortilin overexpression in liver, plasma LDL/atherosclerosis measurements\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP identifying apoB100 as binding partner, bidirectional genetic manipulation in vivo with lipid phenotype, replicated across labs\",\n      \"pmids\": [\"20816088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Sortilin is a high-affinity sorting receptor for PCSK9 in the trans-Golgi network and facilitates PCSK9 secretion from hepatocytes. Sortilin-deficient mice have decreased circulating PCSK9 levels; sortilin overexpression in liver increases plasma PCSK9. Circulating PCSK9 and sortilin levels are positively correlated in a human cohort.\",\n      \"method\": \"Co-localization of sortilin with PCSK9 in TGN, binding assays, sortilin-knockout mice, sortilin overexpression in liver, ELISA of plasma PCSK9, human cohort correlation\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding and colocalization in TGN, bidirectional genetic manipulation in vivo, validated in human cohort\",\n      \"pmids\": [\"24506872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TDP-43 functions within a network of hnRNP proteins (including hnRNP L, PTB/nPTB, and hnRNP A1/A2) to suppress inclusion of exon 17b in SORT1 mRNA, thereby preventing production of a truncated sortilin receptor. Loss of TDP-43 function (as in FTLD-TDP) combined with altered expression of hnRNP A1/A2 and PTB/nPTB leads to aberrant SORT1 splicing.\",\n      \"method\": \"RNA-binding protein knockdown/overexpression, minigene splicing assays, analysis of FTLD-TDP patient tissue for hnRNP expression changes\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional splicing assays with multiple RNA-binding proteins, validated in patient tissue, single lab\",\n      \"pmids\": [\"26614389\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A disease-segregating SORT1 missense mutation (p.Gly171Ala) impairs sortilin protein expression and also reduces mRNA levels of its binding partner p75 neurotrophin receptor (p75NTR), linking sortilin to p75NTR-mediated neuronal apoptosis pathways in an essential tremor family.\",\n      \"method\": \"Whole exome sequencing, mutagenesis, cell culture expression assays, ELISA, apoptosis assays\",\n      \"journal\": \"ASN neuro\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — mutagenesis and cell-based functional assays in single study, single lab\",\n      \"pmids\": [\"26297037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Progranulin derived from Purkinje cells acts retrogradely onto its putative receptor Sort1 on climbing fibers to strengthen developing climbing fiber synaptic inputs and counteract synapse elimination in the neonatal cerebellum (postnatal days 11–16). This progranulin-Sort1 retrograde signaling is independent of semaphorin 3A signaling.\",\n      \"method\": \"Genetic loss-of-function (Sort1 conditional knockout), electrophysiological recordings of CF-PC synapses, in vivo cerebellar circuit analysis, epistasis with semaphorin 3A pathway\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean conditional KO with defined electrophysiological and circuit phenotype, genetic epistasis establishing pathway independence, multiple orthogonal methods\",\n      \"pmids\": [\"29398357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The rs12740374 minor allele sequence in the SORT1 locus enhances hepatic SORT1 expression. CRISPR-Cas9 targeting of this allele in primary human hepatocytes ex vivo and in locus-humanized mice in vivo reproducibly reduced SORT1 expression, establishing the noncoding variant as a causal regulatory element for SORT1 transcription in hepatocytes.\",\n      \"method\": \"CRISPR-Cas9 allele-specific editing in primary human hepatocytes and locus-humanized transgenic mice, quantitative SORT1 mRNA measurements\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — allele-specific CRISPR-Cas9 editing with functional readout in two independent model systems (human primary cells and humanized mice)\",\n      \"pmids\": [\"29097363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Sortilin on the cell surface binds and internalizes LDL via receptor-mediated endocytosis. A mutant sortilin retained predominantly at the cell surface bound very high amounts of LDL, indicating that the cell-surface pool—not an intracellular mechanism—mediates LDL binding. However, SORT1 missense mutations did not substantially alter LDL binding, and SORT1 mutations are unlikely to cause autosomal dominant hypercholesterolemia.\",\n      \"method\": \"Transfection of wild-type and mutant SORT1 constructs in HeLa T-REx cells, siRNA knockdown, cell-surface LDL binding and internalization assays\",\n      \"journal\": \"Atherosclerosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple mutants tested in cell-based assays, bidirectional manipulation (overexpression and siRNA), but single lab\",\n      \"pmids\": [\"23102784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SORT1 and LAMP2 are key regulators of extracellular vesicle (EV) secretion in lenalidomide-resistant multiple myeloma cells. Silencing of SORT1 decreased EV secretion and cell adhesion in resistant cells, restoring sensitivity to lenalidomide.\",\n      \"method\": \"Whole-transcriptome analysis, siRNA silencing of SORT1 and LAMP2, EV secretion quantification, cell adhesion assays, drug sensitivity assays\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional siRNA knockdown with defined EV secretion and drug-resistance phenotype, multiple readouts, single lab\",\n      \"pmids\": [\"34979567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SORT1 receptor mediates internalization of a peptide-drug conjugate (TH1902/TH1904) in triple-negative breast cancer and ovarian cancer cells. SORT1 gene silencing or antibodies directed against its extracellular domain inhibited capillary-like structure (vasculogenic mimicry) formation, demonstrating that SORT1 itself plays a functional role in vasculogenic mimicry.\",\n      \"method\": \"siRNA-mediated SORT1 silencing, competitive inhibition with SORT1 ligands, fluorescent peptide cellular uptake assays, 3D capillary-like structure formation assays, in vivo xenograft models\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA loss-of-function with defined phenotypic readout, confirmed in vivo, single lab\",\n      \"pmids\": [\"34751242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SORT1-targeted peptide-drug conjugate TH1902 is internalized via SORT1 receptor-mediated uptake in cancer stem cells. siRNA repression of SORT1 inhibited uptake of the fluorescent Alexa488-peptide, and competition with SORT1 ligands also blocked uptake, confirming SORT1-dependent internalization.\",\n      \"method\": \"siRNA knockdown, ligand competition assays, fluorescent peptide uptake imaging, flow cytometry, in vivo xenograft\",\n      \"journal\": \"Pharmaceutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA and competition-based confirmation of receptor-mediated uptake, in vivo validation, single lab\",\n      \"pmids\": [\"36145658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SORT1 rare nonsynonymous variants, particularly in the β-propeller domain and the predicted GRN (granulin/progranulin) binding site, are enriched in frontotemporal dementia (FTD) patients, establishing SORT1 as a genetic risk factor for FTD and implicating the GRN-binding region of sortilin in FTD pathogenesis.\",\n      \"method\": \"Whole-exome sequencing, rare variant burden analysis in multiple European patient/control cohorts, meta-analysis\",\n      \"journal\": \"Neurobiology of aging\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Moderate — genetic association/burden analysis without direct biochemical functional validation of individual variants\",\n      \"pmids\": [\"29555433\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Sortilin (SORT1) is a type-I transmembrane sorting receptor that localizes to the trans-Golgi network and interacts with apolipoprotein B100 to facilitate hepatic VLDL/LDL secretion, acts as a high-affinity sorting receptor for PCSK9 to promote its secretion, mediates neurotensin binding as a non-G-protein-coupled receptor, is subject to furin cleavage that converts it to a higher-affinity mature form, regulates extracellular vesicle secretion via LAMP2 co-regulation, participates in progranulin retrograde signaling onto Sort1-expressing climbing fibers to counteract cerebellar synapse elimination, and undergoes TDP-43/hnRNP-regulated alternative splicing of exon 17b that controls production of a truncated isoform relevant to neurodegeneration.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SORT1 encodes sortilin, a type-I transmembrane sorting receptor that governs the intracellular trafficking and secretion of multiple ligands and was originally identified as the 100-kDa neurotensin receptor, the first transmembrane neuropeptide receptor outside the G-protein-coupled receptor superfamily [#0]. Sortilin matures by furin cleavage of a 110-kDa precursor into a higher-affinity 100-kDa form [#0]. In the liver, sortilin is a central regulator of plasma cholesterol: it binds apolipoprotein B100 in the Golgi to facilitate assembly and hepatic export of apoB100-containing lipoproteins [#2], and acts as a high-affinity trans-Golgi network sorting receptor for PCSK9 to promote its secretion [#3]. Hepatic SORT1 expression is itself set by a causal noncoding regulatory variant (rs12740374) that creates a C/EBP binding site, with allele-specific CRISPR editing in primary hepatocytes and humanized mice confirming the variant controls SORT1 transcription and downstream LDL/VLDL levels [#1, #7]. Beyond lipoprotein sorting, cell-surface sortilin binds and internalizes LDL by receptor-mediated endocytosis [#8] and mediates uptake of SORT1-targeted peptide-drug conjugates in cancer cells [#10, #11]. In the nervous system, progranulin signals retrogradely onto Sort1 on cerebellar climbing fibers to strengthen developing synaptic inputs and counteract synapse elimination [#6], and SORT1 mRNA is subject to TDP-43/hnRNP-regulated alternative splicing of exon 17b that controls production of a truncated sortilin isoform implicated in FTLD-TDP [#4].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established the molecular identity of sortilin as a non-GPCR transmembrane neurotensin receptor and defined furin cleavage as the maturation step that confers high-affinity ligand binding.\",\n      \"evidence\": \"Cloning from human brain cDNA, saturable neurotensin binding in transfected COS-7 cells, furin co-transfection, affinity labeling and immunolocalization\",\n      \"pmids\": [\"9756851\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address lipoprotein or PCSK9 sorting functions\", \"Downstream signaling consequences of neurotensin binding not defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed that hepatic sortilin causally controls plasma LDL/VLDL and identified the causal noncoding regulatory mechanism behind a major lipid GWAS locus.\",\n      \"evidence\": \"siRNA knockdown and adenoviral overexpression in mouse liver, VLDL secretion assays, human expression QTL analysis identifying rs12740374 creating a C/EBP site\",\n      \"pmids\": [\"20686566\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direction of effect on secretion not fully reconciled across studies\", \"Molecular cargo bound by sortilin not identified in this study\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified apoB100 as a direct sortilin cargo, providing the molecular mechanism for sortilin's control of hepatic lipoprotein export.\",\n      \"evidence\": \"Reciprocal Co-IP of sortilin with apoB100, gene-targeted knockout and hepatic overexpression in mice with plasma LDL/atherosclerosis readouts\",\n      \"pmids\": [\"20816088\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise binding interface on apoB100/sortilin not mapped\", \"Stoichiometry and Golgi trafficking itinerary not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Distinguished a cell-surface endocytic pool of sortilin that binds and internalizes LDL from intracellular sorting, while showing SORT1 missense variants are unlikely to cause autosomal dominant hypercholesterolemia.\",\n      \"evidence\": \"Wild-type and surface-retained mutant SORT1 constructs in HeLa T-REx cells, siRNA knockdown, cell-surface LDL binding/internalization assays\",\n      \"pmids\": [\"23102784\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Quantitative contribution of surface uptake versus secretory sorting to plasma LDL not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined sortilin as a high-affinity TGN sorting receptor for PCSK9, linking it mechanistically to a second arm of cholesterol regulation.\",\n      \"evidence\": \"TGN colocalization and binding assays, sortilin-knockout and overexpression mice, plasma PCSK9 ELISA, human cohort correlation\",\n      \"pmids\": [\"24506872\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding interface not mapped at residue level\", \"Whether sortilin escorts PCSK9 along a dedicated secretory route not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed that TDP-43 and an hnRNP network suppress SORT1 exon 17b inclusion, connecting RNA-binding-protein dysfunction in FTLD-TDP to production of a truncated sortilin isoform.\",\n      \"evidence\": \"RNA-binding protein knockdown/overexpression, minigene splicing assays, analysis of FTLD-TDP patient tissue\",\n      \"pmids\": [\"26614389\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of the truncated isoform not biochemically characterized\", \"Single lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Implicated a SORT1 missense mutation in essential tremor by impairing sortilin expression and reducing its partner p75NTR, linking sortilin to neuronal apoptosis pathways.\",\n      \"evidence\": \"Whole exome sequencing in a family, mutagenesis, cell-based expression, ELISA, apoptosis assays\",\n      \"pmids\": [\"26297037\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single family/single lab\", \"Causality for the tremor phenotype not established beyond segregation\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Provided causal proof that the rs12740374 noncoding allele drives hepatic SORT1 transcription, closing the loop from regulatory variant to gene expression.\",\n      \"evidence\": \"Allele-specific CRISPR-Cas9 editing in primary human hepatocytes and locus-humanized mice with quantitative SORT1 mRNA readout\",\n      \"pmids\": [\"29097363\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Effect quantified at mRNA level; protein and downstream lipid effects assessed indirectly\", \"Transcription factor occupancy at the edited site not directly measured here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established progranulin-Sort1 retrograde signaling as a developmental synaptic mechanism strengthening climbing-fiber inputs and counteracting synapse elimination, independent of semaphorin 3A.\",\n      \"evidence\": \"Sort1 conditional knockout, electrophysiology of CF-PC synapses, in vivo cerebellar circuit analysis, genetic epistasis with Sema3A\",\n      \"pmids\": [\"29398357\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct progranulin-sortilin binding not biochemically demonstrated in this study\", \"Downstream signaling cascade in climbing fibers not defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed sortilin functions in cancer biology, regulating extracellular vesicle secretion and drug resistance in myeloma and mediating receptor-dependent uptake driving vasculogenic mimicry in solid tumors.\",\n      \"evidence\": \"siRNA silencing of SORT1 (and LAMP2), EV secretion and adhesion assays, fluorescent peptide-drug-conjugate uptake, 3D capillary-formation assays, xenografts\",\n      \"pmids\": [\"34979567\", \"34751242\", \"36145658\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism coupling sortilin to EV biogenesis not resolved\", \"Single-lab findings for each tumor context\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Implicated SORT1 as a genetic risk factor for frontotemporal dementia, with variant enrichment in the β-propeller and predicted GRN-binding region.\",\n      \"evidence\": \"Whole-exome sequencing and rare-variant burden/meta-analysis in European cohorts\",\n      \"pmids\": [\"29555433\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Genetic association without direct biochemical validation of individual variants\", \"Effect of variants on GRN binding not experimentally tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How sortilin's distinct trafficking functions (apoB100/PCSK9 secretory sorting, surface LDL endocytosis, progranulin/neurotensin receptor signaling) are partitioned and regulated within a single cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model integrating multiple ligand-binding modes in the timeline\", \"Mechanism switching sortilin between secretory and endocytic roles unknown\", \"Functional consequence of the truncated splice isoform uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [2, 3, 8]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [8, 10, 11]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [1, 2, 3]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 6]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"APOB\", \"PCSK9\", \"GRN\", \"NGFR\", \"LAMP2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}