{"gene":"SORL1","run_date":"2026-04-28T20:42:08","timeline":{"discoveries":[{"year":2007,"finding":"SORL1/SorLA directs trafficking of APP into recycling pathways; when SORL1 is underexpressed, APP is sorted into Aβ-generating compartments, establishing SORL1 as a regulator of APP intracellular trafficking and amyloidogenic processing.","method":"Cell-based overexpression/knockdown with APP trafficking and Aβ production assays","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — foundational mechanistic study replicated across multiple subsequent labs","pmids":["17220890"],"is_preprint":false},{"year":2001,"finding":"SorLA/LR11 is synthesized as a proreceptor cleaved by furin in late Golgi compartments, activating the Vps10p domain for ligand binding; the receptor binds neuropeptides, receptor-associated protein, apolipoprotein E, and lipoprotein lipase, and mediates endocytosis from the cell surface while the major pool resides in late Golgi compartments.","method":"Furin cleavage assays, ligand binding assays, cell transfection, subcellular fractionation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro biochemical assays with mutagenesis and multiple ligands characterized","pmids":["11294867"],"is_preprint":false},{"year":2002,"finding":"The cytoplasmic tail of SorLA binds GGA1 and GGA2 adaptor proteins via a novel motif (ψ-ψ-X-X-φ) in the C-terminal segment, supporting a role for SorLA in Golgi-to-endosome sorting.","method":"Co-immunoprecipitation, pulldown assays, mutagenesis of cytoplasmic tail residues","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 — direct binding assays with mutagenesis identifying critical residues","pmids":["11821067"],"is_preprint":false},{"year":2006,"finding":"The SorLA/APP interaction is mediated by the cluster of complement-type repeats (CR cluster) in SorLA forming a 1:1 stoichiometric complex with the carbohydrate-linked domain of APP, resulting in APP sequestration in the Golgi and protection from amyloidogenic processing.","method":"FRET-based proximity assay, surface plasmon resonance, analytical ultracentrifugation of recombinant protein fragments","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal biophysical methods with domain mapping","pmids":["16489755"],"is_preprint":false},{"year":2007,"finding":"SorLA cytoplasmic tail mediates Golgi-to-endosome transport via an acidic cluster-dileucine-like motif and a GGA-binding site; AP-1 adaptor complex is essential for SorLA transport between Golgi membranes and endosomes; SNX1 and Vps35 (retromer) are involved in retraction of SorLA from endosomes.","method":"Chimeric receptor trafficking assays, AP-1 μ1-chain-deficient cell experiments, co-immunoprecipitation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including genetic (AP-1 deficiency) and biochemical approaches","pmids":["17646382"],"is_preprint":false},{"year":2006,"finding":"SorLA is a substrate for presenilin-dependent γ-secretase cleavage, preceded by metalloprotease-dependent ectodomain shedding (α-secretase-like cleavage), analogous to other γ-secretase substrates.","method":"γ-secretase inhibitor treatment, PS1/PS2 knockout cells, metalloprotease inhibitor, PMA stimulation","journal":"Molecular neurodegeneration","confidence":"High","confidence_rationale":"Tier 1 — pharmacological inhibitors and genetic knockouts used to establish cleavage pathway","pmids":["16930450"],"is_preprint":false},{"year":2000,"finding":"SorLA undergoes ectodomain shedding by a metalloprotease to release a soluble form; head activator (HA) stimulates SorLA translocation from internal membranes to the cell surface, its internalization, ectodomain shedding, and synthesis; blockade of shedding decreases cell proliferation, indicating SorLA mediates mitogenic HA signaling.","method":"Antisense oligonucleotides, metalloprotease inhibitors, ligand stimulation assays, cell proliferation assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 — functional knockdown with defined phenotype and pharmacological inhibition","pmids":["11082041"],"is_preprint":false},{"year":2012,"finding":"SorLA interacts with the retromer complex via a FANSHY sequence in its cytoplasmic domain recognized by the VPS26 subunit; this interaction is required for retrograde sorting of SorLA (and APP) from endosomes to the TGN. Mutations in the VPS26-binding site redistribute SorLA to endosomes and increase amyloidogenic APP processing despite retained APP-binding activity.","method":"Motif identification, mutagenesis, VPS26 knockdown, co-immunoprecipitation, APP processing assays","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 — reconstitution of interaction with defined motif, mutagenesis, and functional readout","pmids":["22279231"],"is_preprint":false},{"year":2012,"finding":"GGA1 specifically mediates LR11 endocytic traffic; the LR11 GGA-binding motif (when mutated) alters endosomal distribution of LR11 and its effects on APP traffic and Aβ production. GGA1 knockdown reduces both LR11- and BACE1-mediated modulation of APP processing. Mutagenesis of BACE1 S498A enhances BACE1 targeting to LR11-positive compartments and nullifies LR11-mediated Aβ reduction.","method":"siRNA knockdown, GGA-binding motif mutagenesis, APP trafficking assays, Aβ ELISA","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — multiple siRNA targets and mutagenesis with functional readouts","pmids":["22621900"],"is_preprint":false},{"year":2014,"finding":"SorLA directs lysosomal targeting of nascent Aβ peptides by binding Aβ to its amino-terminal VPS10P domain; overexpression of SORLA in mice decreases brain Aβ levels. A familial AD mutation in SORL1 impairs Aβ binding to the VPS10P domain, revealing loss of SorLA's Aβ-sorting function as a disease mechanism.","method":"SORLA transgenic mouse model, brain Aβ measurement, domain binding assays, familial mutation functional testing","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 2 — in vivo mouse model combined with molecular binding studies and disease mutation functional validation","pmids":["24523320"],"is_preprint":false},{"year":2015,"finding":"Crystal structure of the human SorLA VPS10p domain (ten-bladed β-propeller with a central tunnel) in unbound and Aβ-bound states reveals that Aβ and an internal propeptide ligand bind at the same tunnel site; SorLA VPS10p recognizes peptides in redundant modes without strict sequence dependence, favoring β-sheet-forming peptides.","method":"X-ray crystallography, structural analysis of ligand complexes","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 — crystal structures with functional validation","pmids":["25643321"],"is_preprint":false},{"year":2010,"finding":"ROCK2 (Rho-associated coiled-coil kinase 2) binds LR11/SorLA, co-immunoprecipitates from human brain tissue, and phosphorylates LR11 at serine 2206 in its cytoplasmic tail; ROCK2 knockdown decreases LR11 ectodomain shedding and increases intracellular LR11; S2206A mutation reduces LR11 shedding and phosphorylation and abrogates LR11-mediated Aβ reduction.","method":"LC-MS/MS kinase discovery, co-IP from brain, ROCK inhibitor treatment, siRNA knockdown, site-directed mutagenesis, in vitro phosphorylation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal methods including mutagenesis, in vitro kinase assay, and in vivo co-IP","pmids":["21147781"],"is_preprint":false},{"year":2011,"finding":"SORLA prevents APP oligomerization in cultured cells and in vivo in mouse brain, eliminating the preferred oligomeric substrate for secretases and causing secretases to switch to a less efficient non-allosteric mode; secretases are allosteric enzymes requiring APP oligomerization for efficient processing.","method":"Quantitative biochemical studies combined with mathematical modeling; cell and mouse brain APP oligomerization assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — quantitative biochemical and in vivo data with mathematical modeling","pmids":["21989385"],"is_preprint":false},{"year":2015,"finding":"The SorLA CR-cluster (11 complement-type repeat domains) is essential for interaction with APP and for protection against APP processing; deletion of the CR-cluster abolishes APP interaction and protection; mutation of CR-domain fingerprint residues changes O-linked glycosylation of APP in the Golgi.","method":"Stable cell lines expressing SorLA deletion and point mutants, co-immunoprecipitation, Western blotting, ELISA for Aβ","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — domain deletion and mutagenesis with functional readouts","pmids":["25525276"],"is_preprint":false},{"year":2015,"finding":"SORLA has distinct anterograde (GGA-dependent, lysosomal targeting of Aβ) and retrograde (retromer-dependent, TGN retrieval of APP) sorting functions in vivo; disruption of retromer binding causes SORLA accumulation in endosomes, depletion from TGN, and enhanced APP processing; disruption of GGA interaction does not affect APP processing but causes increased brain Aβ levels.","method":"Mouse models expressing SORLA trafficking mutants (GGA-binding or retromer-binding site mutations), APP processing and Aβ measurement in brain","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — in vivo mouse genetic models with distinct trafficking mutants and quantitative readouts","pmids":["26377460"],"is_preprint":false},{"year":2016,"finding":"SNX27 binds the SORLA cytosolic tail to form a ternary complex with APP; SNX27 enhances cell-surface SORLA and APP levels and endosome-to-cell-surface recycling of APP; depletion of SNX27 reduces APP recycling in a SORLA-dependent manner; SNX27 overexpression increases non-amyloidogenic surface APP cleavage products in a SORLA-dependent manner.","method":"Co-immunoprecipitation, knockdown/overexpression, APP recycling kinetics assay, Aβ measurement","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — reciprocal interaction demonstrated with functional trafficking readouts","pmids":["27466343"],"is_preprint":false},{"year":2001,"finding":"LR11 overexpression in cells enables binding and internalization of apolipoprotein E-rich lipoproteins (β-VLDL) with high affinity, mediates cholesteryl ester accumulation, and promotes lipid droplet formation; ApoE content of lipoproteins is a key determinant of high-affinity binding.","method":"LR11 transfection in hamster cells, ligand binding assays, lipoprotein endocytosis and degradation assays, cholesteryl ester accumulation","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 1 — direct functional assays in transfected cells with defined ligands","pmids":["11557679"],"is_preprint":false},{"year":2002,"finding":"LR11 overexpression in smooth muscle cells increases migration and invasion via upregulation of cell-surface urokinase-type plasminogen activator receptor (uPAR); anti-uPA/uPAR antibodies abolish the LR11-dependent migration; LR11 decreases uPAR catabolism, increasing its cell-surface levels.","method":"LR11 cDNA transfection, migration/invasion assays, receptor-associated protein and antibody inhibition, uPAR expression analysis","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 2 — defined mechanistic pathway with multiple inhibition strategies","pmids":["11956127"],"is_preprint":false},{"year":2008,"finding":"LR11/SorLA deficiency in a mouse model of amyloidosis (APPswe/PS1ΔE9) significantly increases Aβ levels, exacerbates early amyloid pathology in a gene-dose-dependent manner, and increases processing of APP holo-molecule into α-, β-, and γ-secretase-derived metabolites, demonstrating that LR11 regulates APP processing and Aβ accumulation in vivo.","method":"LR11-deficient mice crossed with AD transgenic mice; Aβ measurement; amyloid pathology quantification","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic model with gene-dose effect and quantitative Aβ and pathology readouts","pmids":["19036982"],"is_preprint":false},{"year":2008,"finding":"Soluble LR11 (sLR11) promotes vascular smooth muscle cell migration in an Ang II-dependent manner via activation of focal adhesion kinase/ERK/Rac1 and complex formation between uPAR and integrin αvβ3; LR11 gene disruption greatly reduces Ang II-induced SMC migration and arterial intimal thickening in mice.","method":"LR11 knockout mice, femoral artery cuff model, SMC migration assays, signaling pathway analysis by FAK/ERK/Rac1 activation, uPAR-integrin co-immunoprecipitation","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — in vivo knockout model with mechanistic pathway elucidation","pmids":["18618022"],"is_preprint":false},{"year":2013,"finding":"SorLA acts as a sorting receptor for the GDNF/GFRα1 complex, directing it from the cell surface to endosomes for lysosomal degradation of GDNF while GFRα1 recycles; SorLA/GFRα1 complex also targets RET for endocytosis but not degradation, affecting GDNF-induced neurotrophic activities; SorLA-deficient mice display elevated GDNF levels, altered dopaminergic function, hyperactivity, and reduced anxiety.","method":"SorLA knockout mouse model, GDNF/GFRα1/RET trafficking assays, lysosomal degradation assays, behavioral phenotyping","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — in vivo knockout phenotype with defined trafficking mechanism","pmids":["23333276"],"is_preprint":false},{"year":2014,"finding":"α2A adrenergic receptor (α2AAR) activation disrupts APP interaction with SorLA in cells and mouse brain, reducing Golgi localization of APP and promoting APP distribution in endosomes and β-secretase cleavage; α2AAR genetic deficiency reduces Aβ generation and AD-related pathology.","method":"Co-immunoprecipitation of APP-SorLA complex, α2AAR knockout and agonist/antagonist treatments, APP localization by fractionation, Aβ measurement, AD mouse model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — genetic and pharmacological manipulations with mechanistic readout of APP-SorLA interaction","pmids":["25404298"],"is_preprint":false},{"year":2015,"finding":"Soluble LR11/SorLA (sLR11) suppresses thermogenesis in adipose tissue in a cell-autonomous manner; mice lacking LR11 are protected from diet-induced obesity with increased browning of white adipose tissue; sLR11 inhibits thermogenesis via BMP/TGFβ signaling pathway and reduces Smad phosphorylation.","method":"LR11 knockout mice, diet-induced obesity model, adipocyte treatment with sLR11, Smad phosphorylation assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — in vivo knockout model with defined signaling mechanism (Smad phosphorylation)","pmids":["26584636"],"is_preprint":false},{"year":2016,"finding":"SORLA acts as a sorting factor for the insulin receptor (IR) in adipocytes, redirecting internalized IR from endosomes to the plasma membrane, thereby enhancing IR surface expression and strengthening insulin signaling; SORLA overexpression in murine adipose tissue blocks triacylglyceride hydrolysis causing excessive adiposity, while Sorl1 inactivation accelerates lipolysis and protects from diet-induced obesity.","method":"Tissue-specific SORLA overexpression, Sorl1 knockout mice, IR trafficking assays, lipolysis measurements","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic mouse models with defined molecular mechanism","pmids":["27322061"],"is_preprint":false},{"year":2017,"finding":"SORLA interacts with the EphA4 receptor tyrosine kinase and attenuates ephrinA1-induced EphA4 clustering and activation; SORLA transgenic mice show decreased EphA4 activation and redistribution to postsynaptic densities, with milder Aβ oligomer-induced LTP deficits and memory impairment; active EphA4 levels are elevated in human AD brains and inversely correlated with SORLA/EphA4 association.","method":"Co-immunoprecipitation of SORLA-EphA4, SORLA transgenic mice, LTP recordings, behavioral tests, human AD brain analysis","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — direct interaction demonstrated with in vivo functional consequences","pmids":["29114064"],"is_preprint":false},{"year":2019,"finding":"SORLA co-precipitates with HER2 in cancer cells and promotes recycling of endosomal HER2 back to the plasma membrane; SORLA depletion triggers HER2 targeting to late endosomal/lysosomal compartments, impairs HER2-driven signaling and in vivo tumor growth, and disrupts lysosome function.","method":"Co-immunoprecipitation, SORLA knockdown, HER2 trafficking assays, in vivo tumor growth assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP with in vivo functional validation","pmids":["31138794"],"is_preprint":false},{"year":2017,"finding":"SorLA mediates efficient cellular uptake of IL-6 and soluble IL-6 receptor (IL-6R) in astrocytes; SorLA interacts with membrane-bound IL-6R at the cell surface and downregulates IL-6 cis signaling; soluble SorLA ectodomain (shed form) acts as an IL-6 carrier protein stabilizing IL-6 for trans signaling.","method":"SorLA-mediated uptake assays in astrocytes, IL-6 signaling assays, co-immunoprecipitation, ectodomain shedding analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple functional assays establishing both direct interaction and signaling consequence","pmids":["28265003"],"is_preprint":false},{"year":2020,"finding":"SORL1 depletion in hiPSC-derived neurons causes early endosome enlargement and altered APP localization in early endosomes (a site of BACE cleavage); this endosomal phenotype is selective to neurons (not microglia) and is independent of amyloidogenic APP processing, as BACE inhibition does not rescue endosome enlargement.","method":"CRISPR-Cas9 SORL1 depletion in hiPSCs, endosome size measurement, APP localization by immunofluorescence, BACE inhibitor treatment, comparison across cell types","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — isogenic CRISPR model with epistasis experiment (BACE inhibition) establishing pathway independence","pmids":["32492427"],"is_preprint":false},{"year":2022,"finding":"SORL1 regulates endosomal trafficking and recycling of APP, TRKB, and GLUA1 in human hiPSC-derived neurons; SORL1 depletion impairs trafficking of all three cargoes to late endosomes/lysosomes and reduces recycling endosome-to-cell-surface delivery of APP and GLUA1; SORL1 overexpression enhances endosomal recycling; loss of GLUA1 recycling functionally impairs synaptic activity measured by MEA.","method":"Isogenic hiPSC SORL1 knockout/overexpression, confocal microscopy, cell surface recycling assays, lysosomal degradation assays, MEA recordings, RNA sequencing","journal":"Cellular and molecular life sciences","confidence":"High","confidence_rationale":"Tier 2 — isogenic human neuron model with multiple orthogonal methods and functional readout","pmids":["35226190"],"is_preprint":false},{"year":2014,"finding":"Tetraspanin CD9 modulates ADAM17-mediated shedding of LR11 in leukocytes; CD9 colocalization with LR11 on the cell surface restrains shedding; CD9 knockdown or antibody blockade increases sLR11 release, which is abrogated by metalloprotease inhibitor GM6001.","method":"Confocal colocalization, CD9 overexpression/knockdown, neutralizing antibody, metalloprotease inhibitor, sLR11 ELISA","journal":"Experimental & molecular medicine","confidence":"High","confidence_rationale":"Tier 2 — pharmacological and genetic approaches with defined metalloprotease pathway","pmids":["24699135"],"is_preprint":false},{"year":2010,"finding":"SorCS1 (a sortilin family member) forms complexes with APP, SorL1, and Vps35 recoverable from non-transgenic mouse brain; Sorcs1 hypomorphic female mice show decreased total SorL1 (29%) and Vps35 (49%) protein levels and increased endogenous murine Aβ40 and Aβ42, indicating SorCS1 functionally interacts with SorLA/retromer in APP/Aβ metabolism.","method":"Co-immunoprecipitation from mouse brain, Sorcs1 hypomorphic mouse model, Aβ ELISA, Western blot quantification","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP from brain and in vivo genetic model, but SorCS1-SorLA relationship indirect","pmids":["20881129"],"is_preprint":false},{"year":2012,"finding":"An intronic antisense ncRNA (51A) mapping to intron 1 of SORL1 drives a splicing shift from canonical long SORL1 variant A to an alternatively spliced form, resulting in decreased SORL1 variant A synthesis and impaired APP processing leading to increased Aβ formation; 51A is upregulated in AD cerebral cortex.","method":"ncRNA overexpression, SORL1 isoform quantification, APP processing and Aβ assays, human brain expression analysis","journal":"Disease models & mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 — functional ncRNA overexpression with defined splicing and Aβ readouts","pmids":["22996644"],"is_preprint":false},{"year":2021,"finding":"Rare SORL1 missense variants (S114R, R332W, G543E, S577P, R654W, and others) cause impaired SorLA maturation and endosomal trafficking by retaining the protein in the endoplasmic reticulum, reducing delivery of mature SorLA to the plasma membrane and endosomal system; R332W and R654W variants expressed at endogenous levels in hiPSCs increase Aβ secretion, demonstrating loss-of-function.","method":"HEK293 overexpression screen (70 variants), CRISPR/Cas9-modified hiPSCs, maturation assays, subcellular localization by immunofluorescence, Aβ ELISA","journal":"Acta neuropathologica communications","confidence":"High","confidence_rationale":"Tier 2 — large variant screen validated in isogenic hiPSC model with functional Aβ readout","pmids":["34922638"],"is_preprint":false},{"year":2020,"finding":"Soluble SORLA (sSORLA) binds and activates the EGF receptor (EGFR), triggering ERK activation and Fos upregulation to enhance neurite outgrowth and regeneration; pharmacological EGFR or ERK inhibition reverses sSORLA-dependent neurite outgrowth enhancement.","method":"SORLA transgenic neurons, sSORLA purification, co-precipitation of sSORLA with EGFR, EGFR phosphorylation assay, ERK activation, pharmacological inhibition, neurite outgrowth assays, RNAseq","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — direct binding demonstrated with pharmacological epistasis and functional readout","pmids":["32601248"],"is_preprint":false},{"year":2021,"finding":"SorLA interacts directly with HER3 and forms a trimeric complex with HER2 and HER3, attenuating lysosomal degradation of the HER2-HER3 dimer in a Rab4-dependent recycling manner; heregulin-mediated signaling supports SorLA transcription downstream of the MAPK pathway; SorLA loss sensitizes cancer cells to neratinib.","method":"Co-immunoprecipitation of SorLA-HER3, Rab4-dependent recycling assays, SorLA knockdown, in vivo zebrafish xenograft, MAPK pathway inhibition","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — direct interaction with defined recycling mechanism and in vivo functional validation","pmids":["33420373"],"is_preprint":false},{"year":2023,"finding":"SORLA dimerizes via its fibronectin-type-III (3Fn) and VPS10p domains within retromer-positive endosomal tubules; a SORLA fragment comprising the 3Fn, transmembrane, and cytoplasmic domains forms dimers and enhances retromer-dependent recycling of APP by decreasing amyloidogenic processing.","method":"X-ray crystallography, AlphaFold structural modeling, SORLA fragment functional assays, APP processing assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — crystallographic structure with functional validation of dimerization in recycling","pmids":["36652482"],"is_preprint":false},{"year":2023,"finding":"Loss of SORL1 in neurons (but not astrocytes) causes cell-type-specific reduction of APOE and CLU (clusterin) and altered lipid profiles; TGF-β/SMAD signaling is implicated in SORL1 function; modulating SMAD signaling alters APOE RNA levels in a SORL1-dependent manner; retromer enhancement rescues tau phenotypes but not APOE levels in SORL1-null neurons.","method":"SORL1-null iPSCs differentiated to multiple cell types, RNA sequencing, APOE/CLU quantification, retromer rescue experiments, SMAD signaling modulation","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — isogenic multi-cell-type model with pathway rescue experiments","pmids":["37611586"],"is_preprint":false},{"year":2022,"finding":"SORL1 haploinsufficiency in Göttingen minipigs (CRISPR-Cas9 engineered) phenocopies the preclinical in vivo AD biomarker profile of APP/PSEN1/PSEN2 mutations, with elevated Aβ and tau biofluid levels preceding amyloid plaque formation, supporting SORL1 haploinsufficiency as causal for AD through endosome cytopathology.","method":"CRISPR-Cas9 minipig SORL1 haploinsufficiency model, CSF and blood Aβ/tau biomarker measurement","journal":"Cell reports. Medicine","confidence":"High","confidence_rationale":"Tier 2 — large animal in vivo genetic model with quantitative biomarker readouts","pmids":["36099918"],"is_preprint":false},{"year":2016,"finding":"SorLA mediates polarized trafficking in neurons (somatodendritic domain) and epithelial MDCK cells (basolateral surface); polarized distribution depends on an acidic cluster motif and involves the AP-1 adaptor complex; SorLA can mediate transcytosis across tight cell layers.","method":"MDCK polarized cell trafficking, hippocampal neuron localization, AP-1 dependence, transcytosis assay","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 — defined trafficking signals in polarized cells with functional transcytosis readout","pmids":["27192064"],"is_preprint":false},{"year":2013,"finding":"Soluble LR11 (sLR11) regulates hypoxia-induced uPAR-mediated adhesion of hematopoietic stem and progenitor cells (HSPCs) to bone marrow stromal cells; hypoxia increases LR11 expression in HSPCs via HIF-1α binding to the LR11 promoter; lr11-/- mouse HSPCs show reduced hypoxia-enhanced attachment; sLR11 promotes HSPC adhesion through uPAR.","method":"LR11 knockout mice, HSPC adhesion assays, HIF-1α ChIP, uPAR blocking antibodies, U937 cell hypoxia experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — in vivo knockout model with defined signaling mechanism and promoter ChIP","pmids":["23486467"],"is_preprint":false},{"year":2024,"finding":"The SORL1 missense variant p.R953C occurs at a critical position in the YWTD-domain and causes retention of SorLA in the ER, reducing maturation, shedding, and normal endosomal trafficking, consistent with a pathogenic loss-of-function mechanism for AD.","method":"Family sequencing, SORL1 variant functional studies in cells, ER retention assays, maturation and shedding assays","journal":"Acta neuropathologica","confidence":"Medium","confidence_rationale":"Tier 2 — functional characterization in patient-derived variant context with defined cellular mechanism","pmids":["38244079"],"is_preprint":false},{"year":2023,"finding":"Pharmacological enhancement of retromer (TPT-260, a retromer-stabilizing molecule) rescues endosomal, amyloid, and tau pathologies in SORL1-deficient, haploinsufficient, and variant-expressing hiPSC-derived cortical neurons; the degree of rescue depends on the number of functional SORL1 copies, establishing the SORL1-retromer axis as therapeutically targetable.","method":"hiPSC-derived cortical neurons with SORL1 CRISPR variants, TPT-260 treatment, retromer subunit quantification, endosome, Aβ, and tau phenotype assays","journal":"Stem cell reports","confidence":"Medium","confidence_rationale":"Tier 2 — disease-relevant human cell model with pharmacological intervention and multiple readouts","pmids":["37949073"],"is_preprint":false},{"year":1999,"finding":"LR11 protein is localized mainly to neurons throughout the rat and human brain, with highest immunoreactivity in hippocampus, brainstem nuclei, and Purkinje cells; a unique single cytoplasmic punctum (putative botrysome) is observed near apical dendrites of pyramidal neurons, suggesting roles in intracellular trafficking.","method":"Immunohistochemistry in rat and human brain with anti-LR11 polyclonal antibody","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization experiment in multiple species with quantitative description","pmids":["10375696"],"is_preprint":false}],"current_model":"SORL1/SorLA is a large multidomain neuronal sorting receptor that regulates the intracellular trafficking of APP and other cargoes (including GLUA1, TRKB, HER2, HER3, insulin receptor, IL-6R, and GDNF/GFRα1) by cycling between the TGN, endosomes, and the plasma membrane through interactions with cytosolic adaptors GGA1/2, the retromer complex (via a FANSHY-VPS26 interaction), AP-1, and SNX27; retromer-dependent retrograde sorting retrieves APP from endosomes to the TGN to prevent amyloidogenic processing, while GGA-dependent anterograde sorting directs newly generated Aβ to lysosomes for degradation; ROCK2-mediated phosphorylation of the cytoplasmic tail at S2206 regulates ectodomain shedding (executed by ADAM17, modulated by tetraspanin CD9), releasing a soluble form that activates EGFR/ERK signaling and modulates uPAR-mediated cell migration; loss-of-function variants or haploinsufficiency cause endosomal enlargement, increased Aβ production, reduced APOE/CLU levels via TGF-β/SMAD signaling, and elevated tau, establishing SORL1 as a causal Alzheimer's disease gene."},"narrative":{"teleology":[{"year":1999,"claim":"Before functional characterization, SorLA's expression pattern needed mapping; immunohistochemistry revealed that LR11/SorLA is a predominantly neuronal protein enriched in hippocampus and brainstem, establishing the brain as a primary site of function.","evidence":"Immunohistochemistry in rat and human brain with polyclonal anti-LR11 antibody","pmids":["10375696"],"confidence":"Medium","gaps":["Single antibody used without knockout validation","Subcellular compartment identity of the cytoplasmic punctum unresolved"]},{"year":2000,"claim":"Early work established that SorLA undergoes metalloprotease-mediated ectodomain shedding and that this shedding is linked to mitogenic signaling via head activator, revealing SorLA as both a trafficking receptor and a signaling intermediate.","evidence":"Antisense knockdown, metalloprotease inhibition, and cell proliferation assays in neuronal cell lines","pmids":["11082041"],"confidence":"Medium","gaps":["Shedding protease identity not defined","Head activator pathway relevance to mammalian physiology uncertain"]},{"year":2001,"claim":"Biochemical characterization showed that SorLA is furin-cleaved in the late Golgi to activate its VPS10p domain for ligand binding (including ApoE and RAP), and that the receptor can mediate endocytosis of ApoE-rich lipoproteins, establishing SorLA as a multifunctional endocytic receptor.","evidence":"Furin cleavage assays, ligand binding studies, lipoprotein internalization and cholesteryl ester accumulation assays in transfected cells","pmids":["11294867","11557679"],"confidence":"High","gaps":["Physiological relevance of lipoprotein uptake in neurons versus peripheral tissues unclear","Post-furin trafficking itinerary not resolved"]},{"year":2002,"claim":"Identification of GGA1/2 binding to a ψ-ψ-X-X-φ motif in the SorLA cytoplasmic tail and the discovery that SorLA promotes uPAR-dependent cell migration established two key functional axes: Golgi-to-endosome sorting via coat adaptors and regulation of cell motility.","evidence":"Co-IP and pulldown with mutagenesis of tail residues; SMC migration/invasion assays with uPAR-blocking antibodies","pmids":["11821067","11956127"],"confidence":"High","gaps":["Whether GGA and uPAR pathways are mechanistically linked was unknown","In vivo relevance of SorLA in vascular remodeling not yet tested"]},{"year":2006,"claim":"Biophysical studies defined the molecular basis of the SorLA–APP interaction: the complement-type repeat (CR) cluster forms a 1:1 complex with the APP carbohydrate-linked domain, sequestering APP in the Golgi and protecting it from amyloidogenic processing; simultaneously, SorLA was shown to be a γ-secretase substrate.","evidence":"SPR, analytical ultracentrifugation, FRET proximity assays; PS1/PS2 knockout cells and γ-secretase inhibitors","pmids":["16489755","16930450"],"confidence":"High","gaps":["Whether γ-secretase cleavage of SorLA has a signaling function was unknown","CR-cluster domain requirement not yet tested by deletion mutagenesis"]},{"year":2007,"claim":"Functional studies demonstrated that SorLA directs APP into recycling pathways and that loss of SorLA shunts APP into Aβ-generating compartments; parallel work mapped the AP-1, GGA, and retromer (VPS35/SNX1) machinery controlling SorLA trafficking between Golgi and endosomes.","evidence":"Cell-based APP trafficking/Aβ assays with SORL1 knockdown/overexpression; chimeric receptor trafficking in AP-1-deficient cells, co-IP with retromer subunits","pmids":["17220890","17646382"],"confidence":"High","gaps":["Precise retromer binding motif on SorLA unidentified","In vivo genetic evidence for SorLA's protective role lacking"]},{"year":2008,"claim":"In vivo genetic models validated SorLA as a dose-dependent regulator of APP processing and Aβ accumulation, and showed that soluble SorLA promotes vascular SMC migration via FAK/ERK/Rac1 and uPAR–integrin complexes.","evidence":"LR11-deficient mice crossed with APPswe/PS1ΔE9 AD model; LR11 knockout femoral artery cuff model with signaling assays","pmids":["19036982","18618022"],"confidence":"High","gaps":["Mechanism by which SorLA dosage controls secretase access not defined","Whether vascular and neuronal functions intersect in AD pathogenesis unclear"]},{"year":2010,"claim":"ROCK2 was identified as a kinase that phosphorylates SorLA at S2206, regulating ectodomain shedding; this provided the first post-translational switch controlling SorLA surface levels and thereby Aβ reduction.","evidence":"LC-MS/MS kinase screen, co-IP from human brain, S2206A mutagenesis, in vitro kinase assay","pmids":["21147781"],"confidence":"High","gaps":["Whether other kinases or phosphatases regulate SorLA tail phosphorylation unknown","Physiological signals activating ROCK2-SorLA axis in neurons not identified"]},{"year":2012,"claim":"The FANSHY motif in SorLA's cytoplasmic tail was mapped as the VPS26-binding site required for retromer-mediated endosome-to-TGN retrieval; disruption of this motif redistributed SorLA to endosomes and increased amyloidogenic processing, completing the molecular logic of SorLA's retrograde sorting.","evidence":"Motif identification, VPS26 knockdown, mutagenesis, APP processing assays","pmids":["22279231"],"confidence":"High","gaps":["Structure of the VPS26–FANSHY complex unresolved","Whether other retromer subunits contribute to SorLA recognition unknown"]},{"year":2012,"claim":"GGA1 was shown to specifically mediate endocytic LR11 traffic affecting BACE1 localization and Aβ production, and SorLA was found to prevent APP oligomerization needed for efficient allosteric secretase cleavage, revealing a second mechanism (beyond compartmental segregation) by which SorLA suppresses Aβ generation.","evidence":"GGA-binding motif mutagenesis with siRNA; quantitative biochemical/mathematical modeling of APP oligomerization in cells and mouse brain","pmids":["22621900","21989385"],"confidence":"High","gaps":["Structural basis of SorLA-mediated monomerization of APP unknown","Relative contributions of trafficking vs. oligomerization mechanisms not quantified in vivo"]},{"year":2013,"claim":"SorLA's cargo repertoire was expanded beyond APP to include the GDNF/GFRα1 complex (directing GDNF to lysosomes while recycling GFRα1) and soluble LR11-mediated uPAR-dependent HSPC adhesion, demonstrating SorLA as a general-purpose sorting receptor for diverse ligands.","evidence":"SorLA knockout mice with GDNF/RET trafficking and behavioral phenotyping; lr11−/− HSPC adhesion assays with HIF-1α ChIP","pmids":["23333276","23486467"],"confidence":"High","gaps":["How SorLA discriminates among diverse cargoes for lysosomal versus recycling routes unclear","Neuronal consequences of GDNF mis-sorting in AD context not explored"]},{"year":2014,"claim":"SorLA's VPS10p domain was shown to directly bind Aβ peptides and direct them to lysosomes for degradation, and a familial AD mutation in this domain impaired Aβ binding, linking loss of Aβ-sorting function to disease; separately, α2A-adrenergic receptor activation was shown to disrupt the SorLA–APP complex and promote amyloidogenic processing.","evidence":"SORLA transgenic mice, domain binding assays, disease mutation testing; α2AAR knockout and pharmacological manipulation with APP-SorLA co-IP","pmids":["24523320","25404298"],"confidence":"High","gaps":["Whether adrenergic modulation of SorLA–APP is therapeutically exploitable unknown","Range of FAD-linked VPS10p mutations affecting Aβ binding not systematically mapped"]},{"year":2015,"claim":"Crystal structure of the VPS10p domain revealed a ten-bladed β-propeller with a central tunnel binding Aβ and propeptide through redundant β-sheet-recognition modes; CR-cluster deletion confirmed its necessity for APP interaction; in vivo mouse models with distinct GGA- and retromer-binding mutations dissected anterograde versus retrograde sorting functions.","evidence":"X-ray crystallography; CR-cluster deletion mutagenesis; knock-in mice with GGA-binding or retromer-binding site mutations","pmids":["25643321","25525276","26377460"],"confidence":"High","gaps":["Full-length SorLA structure not determined","How VPS10p tunnel accommodates larger cargoes unknown"]},{"year":2016,"claim":"SNX27 was identified as a new SorLA adaptor forming a ternary complex with APP to promote endosome-to-surface recycling; SorLA was also shown to sort the insulin receptor back to the plasma membrane in adipocytes, strengthening insulin signaling and controlling lipolysis, and to mediate polarized trafficking via AP-1-dependent basolateral/somatodendritic targeting.","evidence":"Co-IP and recycling kinetics in neurons; tissue-specific SORLA overexpression and Sorl1 KO in mice; MDCK and hippocampal neuron polarized trafficking assays","pmids":["27466343","27322061","27192064"],"confidence":"High","gaps":["SNX27 binding site on SorLA tail not mapped","Whether metabolic and neuronal sorting functions use the same tail motifs unclear"]},{"year":2017,"claim":"SorLA was shown to attenuate EphA4 receptor clustering and activation, protecting against Aβ oligomer-induced synaptic toxicity, and to modulate IL-6 signaling by mediating uptake of IL-6/IL-6R in astrocytes while soluble SorLA stabilizes IL-6 for trans signaling.","evidence":"Co-IP of SORLA-EphA4, SORLA transgenic mice with LTP/behavioral tests, human AD brain analysis; astrocyte IL-6 uptake and signaling assays","pmids":["29114064","28265003"],"confidence":"High","gaps":["Whether EphA4 attenuation is a direct trafficking or competition effect not resolved","In vivo neuroinflammatory consequences of SorLA-IL-6R axis unexplored"]},{"year":2019,"claim":"In cancer cells, SorLA was found to recycle endosomal HER2 to the plasma membrane; SORLA depletion diverted HER2 to lysosomes, impairing HER2-driven signaling and tumor growth, later extended to a SorLA–HER3 trimeric complex with Rab4-dependent recycling.","evidence":"Co-IP, SORLA knockdown, HER2 trafficking, in vivo tumor assays; SorLA-HER3 co-IP, Rab4 dependence, zebrafish xenograft","pmids":["31138794","33420373"],"confidence":"High","gaps":["Whether SorLA sorting of oncogenic RTKs is mechanistically identical to APP sorting untested","Structural basis of SorLA–HER2/HER3 interaction unknown"]},{"year":2020,"claim":"SORL1 depletion in hiPSC-derived neurons caused early endosome enlargement independent of amyloidogenic processing, establishing endosomal dysfunction as a primary consequence of SORL1 loss; soluble SorLA was shown to bind and activate EGFR/ERK to promote neurite outgrowth.","evidence":"CRISPR SORL1-null iPSC neurons with BACE inhibitor epistasis; sSORLA-EGFR co-precipitation, ERK assays, neurite outgrowth with pharmacological inhibition","pmids":["32492427","32601248"],"confidence":"High","gaps":["Molecular cargo driving endosome enlargement upon SORL1 loss not identified","Whether sSORLA-EGFR signaling is neuroprotective in vivo unknown"]},{"year":2021,"claim":"Systematic functional screening of rare SORL1 missense variants demonstrated that pathogenic variants cause ER retention, impaired maturation, and loss of endosomal trafficking, with isogenic hiPSC validation showing increased Aβ secretion, firmly establishing SORL1 loss-of-function as a monogenic AD mechanism.","evidence":"HEK293 overexpression screen of 70 variants, CRISPR-modified hiPSCs with maturation and Aβ assays","pmids":["34922638"],"confidence":"High","gaps":["Not all variants tested at endogenous expression levels","Genotype-phenotype correlation for clinical severity not established"]},{"year":2022,"claim":"SORL1's role as a general neuronal sorting receptor was confirmed: SORL1 regulates trafficking and recycling of TRKB and GLUA1 in addition to APP, with loss of GLUA1 recycling impairing synaptic function; SORL1 haploinsufficiency in minipigs phenocopied APP/PSEN mutation biomarker profiles with elevated Aβ and tau preceding plaques.","evidence":"Isogenic hiPSC neurons with KO/overexpression, MEA recordings; CRISPR-Cas9 SORL1+/− Göttingen minipigs with CSF biomarkers","pmids":["35226190","36099918"],"confidence":"High","gaps":["Full synaptic cargo repertoire of SORL1 not defined","Whether haploinsufficiency is sufficient for clinical AD in humans with complete penetrance unclear"]},{"year":2023,"claim":"Structural work revealed that SORL1 dimerizes via 3Fn and VPS10p domains in retromer-positive tubules to enhance APP recycling, and transcriptomic studies in SORL1-null neurons showed cell-type-specific reduction of APOE and CLU via TGF-β/SMAD signaling; retromer stabilization by TPT-260 rescued endosomal, Aβ, and tau phenotypes dose-dependently.","evidence":"X-ray crystallography of 3Fn dimer; SORL1-null iPSC neurons with RNA-seq, SMAD modulation, retromer rescue; TPT-260 pharmacological rescue in hiPSC neurons","pmids":["36652482","37611586","37949073"],"confidence":"High","gaps":["Whether SORL1 dimerization is regulated or constitutive unknown","Molecular link between SORL1 loss and SMAD-dependent APOE downregulation not fully resolved","In vivo efficacy of retromer stabilizers for SORL1-driven AD not tested"]},{"year":null,"claim":"Key open questions include the full-length SorLA structure, how SorLA selects among its diverse cargoes for distinct endosomal fates, whether retromer-stabilizing compounds rescue AD phenotypes in vivo, and the clinical penetrance of heterozygous loss-of-function variants in human populations.","evidence":"","pmids":[],"confidence":"High","gaps":["Full-length SorLA structure not determined","Cargo selectivity mechanism unresolved","In vivo therapeutic validation of retromer stabilizers lacking","Penetrance of SORL1 haploinsufficiency in humans not quantified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[0,9,20,23,25,28]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[1,16]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,4,7,15]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[1,3,4]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[7,14,27,28]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[6,15,23]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[4,14,38]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,4,7,14,15,28,35]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[2,8,14,38]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[9,32,37]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[22,33,34]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[24,28]}],"complexes":["Retromer complex (via VPS26-FANSHY interaction)","SorLA-APP complex","SorLA-HER2-HER3 trimeric complex"],"partners":["APP","VPS26A","GGA1","SNX27","ROCK2","EGFR","ERBB2","ERBB3"],"other_free_text":[]},"mechanistic_narrative":"SORL1 encodes SorLA, a multidomain type I transmembrane sorting receptor that functions as a master regulator of intracellular vesicular trafficking, directing the endosomal fate of APP and multiple other transmembrane cargoes including TRKB, GLUA1, HER2/HER3, insulin receptor, IL-6R, and the GDNF/GFRα1 complex [PMID:17220890, PMID:35226190, PMID:31138794, PMID:33420373, PMID:27322061, PMID:28265003, PMID:23333276]. SorLA cycles between the TGN, endosomes, and the plasma membrane through interactions with the retromer complex (via a FANSHY–VPS26 interaction), GGA1/2, AP-1, and SNX27; retromer-dependent retrograde sorting retrieves APP from endosomes to the TGN to prevent amyloidogenic processing, while GGA-dependent anterograde sorting targets newly generated Aβ peptides to lysosomes for degradation via the VPS10p domain [PMID:22279231, PMID:11821067, PMID:17646382, PMID:27466343, PMID:26377460, PMID:24523320]. SorLA dimerizes through its fibronectin-type-III and VPS10p domains within retromer-positive endosomal tubules to enhance APP recycling, and its ectodomain undergoes ADAM17-mediated shedding—modulated by ROCK2 phosphorylation at S2206 and tetraspanin CD9—releasing a soluble form (sSORLA) that activates EGFR/ERK signaling to promote neurite outgrowth [PMID:36652482, PMID:21147781, PMID:24699135, PMID:32601248]. Loss-of-function variants and haploinsufficiency cause endosomal enlargement, increased Aβ production, elevated tau, and reduced APOE/CLU levels, establishing SORL1 as a causal Alzheimer's disease gene [PMID:34922638, PMID:36099918, PMID:37611586, PMID:32492427]."},"prefetch_data":{"uniprot":{"accession":"Q92673","full_name":"Sortilin-related receptor","aliases":["Low-density lipoprotein receptor relative with 11 ligand-binding repeats","LDLR relative with 11 ligand-binding repeats","LR11","SorLA-1","Sorting protein-related receptor containing LDLR class A repeats","SorLA"],"length_aa":2214,"mass_kda":248.4,"function":"Sorting receptor that directs several proteins to their correct location within the cell (Probable). Along with AP-1 complex, involved Golgi apparatus - endosome sorting (PubMed:17646382). Sorting receptor for APP, regulating its intracellular trafficking and processing into amyloidogenic-beta peptides. Retains APP in the trans-Golgi network, hence preventing its transit through late endosomes where amyloid beta peptides Abeta40 and Abeta42 are generated (PubMed:16174740, PubMed:16407538, PubMed:17855360, PubMed:24523320). May also sort newly produced amyloid-beta peptides to lysosomes for catabolism (PubMed:24523320). Does not affect APP trafficking from the endoplasmic reticulum to Golgi compartments (PubMed:17855360). Sorting receptor for the BDNF receptor NTRK2/TRKB that facilitates NTRK2 trafficking between synaptic plasma membranes, postsynaptic densities and cell soma, hence positively regulates BDNF signaling by controlling the intracellular location of its receptor (PubMed:23977241). Sorting receptor for GDNF that promotes GDNF regulated, but not constitutive secretion (PubMed:21994944). Sorting receptor for the GDNF-GFRA1 complex, directing it from the cell surface to endosomes. GDNF is then targeted to lysosomes and degraded, while its receptor GFRA1 recycles back to the cell membrane, resulting in a GDNF clearance pathway. The SORL1-GFRA1 complex further targets RET for endocytosis, but not for degradation, affecting GDNF-induced neurotrophic activities (PubMed:23333276). Sorting receptor for ERBB2/HER2. Regulates ERBB2 subcellular distribution by promoting its recycling after internalization from endosomes back to the plasma membrane, hence stimulating phosphoinositide 3-kinase (PI3K)-dependent ERBB2 signaling. In ERBB2-dependent cancer cells, promotes cell proliferation (PubMed:31138794). Sorting receptor for lipoprotein lipase LPL. Promotes LPL localization to endosomes and later to the lysosomes, leading to degradation of newly synthesized LPL (PubMed:21385844). Potential sorting receptor for APOA5, inducing APOA5 internalization to early endosomes, then to late endosomes, wherefrom a portion is sent to lysosomes and degradation, another portion is sorted to the trans-Golgi network (PubMed:18603531). Sorting receptor for the insulin receptor INSR. Promotes recycling of internalized INSR via the Golgi apparatus back to the cell surface, thereby preventing lysosomal INSR catabolism, increasing INSR cell surface expression and strengthening insulin signal reception in adipose tissue. Does not affect INSR internalization (PubMed:27322061). Plays a role in renal ion homeostasis, controlling the phospho-regulation of SLC12A1/NKCC2 by STK39/SPAK kinase and PPP3CB/calcineurin A beta phosphatase, possibly through intracellular sorting of STK39 and PPP3CB (By similarity). Stimulates, via the N-terminal ectodomain, the proliferation and migration of smooth muscle cells, possibly by increasing cell surface expression of the urokinase receptor uPAR/PLAUR. This may promote extracellular matrix proteolysis and hence facilitate cell migration (PubMed:14764453). By acting on the migration of intimal smooth muscle cells, may accelerate intimal thickening following vascular injury (PubMed:14764453). Promotes adhesion of monocytes (PubMed:23486467). Stimulates proliferation and migration of monocytes/macrophages (By similarity). Through its action on intimal smooth muscle cells and macrophages, may accelerate intimal thickening and macrophage foam cell formation in the process of atherosclerosis (By similarity). Regulates hypoxia-enhanced adhesion of hematopoietic stem and progenitor cells to the bone marrow stromal cells via a PLAUR-mediated pathway. This function is mediated by the N-terminal ectodomain (PubMed:23486467). Metabolic regulator, which functions to maintain the adequate balance between lipid storage and oxidation in response to changing environmental conditions, such as temperature and diet. The N-terminal ectodomain negatively regulates adipose tissue energy expenditure, acting through the inhibition the BMP/Smad pathway (By similarity). May regulate signaling by the heterodimeric neurotrophic cytokine CLCF1-CRLF1 bound to the CNTFR receptor by promoting the endocytosis of the tripartite complex CLCF1-CRLF1-CNTFR and lysosomal degradation (PubMed:26858303). May regulate IL6 signaling, decreasing cis signaling, possibly by interfering with IL6-binding to membrane-bound IL6R, while up-regulating trans signaling via soluble IL6R (PubMed:28265003)","subcellular_location":"Golgi apparatus membrane; Golgi apparatus, trans-Golgi network membrane; Endosome membrane; Early endosome membrane; Recycling endosome membrane; Endoplasmic reticulum membrane; Endosome, multivesicular body membrane; Cell membrane; Cytoplasmic vesicle, secretory vesicle membrane; Secreted","url":"https://www.uniprot.org/uniprotkb/Q92673/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SORL1","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CANX","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/SORL1","total_profiled":1310},"omim":[{"mim_id":"608853","title":"BH3-LIKE MOTIF-CONTAINING CELL DEATH INDUCER; BLID","url":"https://www.omim.org/entry/608853"},{"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":"602005","title":"SORTILIN-RELATED RECEPTOR; SORL1","url":"https://www.omim.org/entry/602005"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SORL1"},"hgnc":{"alias_symbol":["gp250","LR11","LRP9","SorLA","SorLA-1"],"prev_symbol":["C11orf32"]},"alphafold":{"accession":"Q92673","domains":[{"cath_id":"-","chopping":"305-398","consensus_level":"medium","plddt":82.6364,"start":305,"end":398},{"cath_id":"-","chopping":"414-537_623-676","consensus_level":"medium","plddt":86.5904,"start":414,"end":676},{"cath_id":"3.30.60.270","chopping":"686-749","consensus_level":"medium","plddt":71.6072,"start":686,"end":749},{"cath_id":"2.120.10.30","chopping":"826-1001","consensus_level":"medium","plddt":88.2505,"start":826,"end":1001},{"cath_id":"4.10.400.10","chopping":"1204-1235","consensus_level":"medium","plddt":70.29,"start":1204,"end":1235},{"cath_id":"4.10.400","chopping":"1472-1504","consensus_level":"medium","plddt":70.5106,"start":1472,"end":1504},{"cath_id":"2.60.40.10","chopping":"1557-1648","consensus_level":"medium","plddt":67.9452,"start":1557,"end":1648},{"cath_id":"2.60.40.10","chopping":"1659-1743","consensus_level":"high","plddt":77.3444,"start":1659,"end":1743},{"cath_id":"2.60.40.10","chopping":"1848-1927","consensus_level":"high","plddt":78.6738,"start":1848,"end":1927},{"cath_id":"2.60.40.10","chopping":"1937-2022","consensus_level":"high","plddt":78.948,"start":1937,"end":2022},{"cath_id":"2.60.40.10","chopping":"2025-2138","consensus_level":"medium","plddt":66.9676,"start":2025,"end":2138},{"cath_id":"2.20.130","chopping":"1785-1843","consensus_level":"medium","plddt":75.7698,"start":1785,"end":1843}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92673","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q92673-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q92673-F1-predicted_aligned_error_v6.png","plddt_mean":73.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SORL1","jax_strain_url":"https://www.jax.org/strain/search?query=SORL1"},"sequence":{"accession":"Q92673","fasta_url":"https://rest.uniprot.org/uniprotkb/Q92673.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q92673/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92673"}},"corpus_meta":[{"pmid":"17220890","id":"PMC_17220890","title":"The neuronal sortilin-related receptor SORL1 is genetically associated with Alzheimer disease.","date":"2007","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/17220890","citation_count":925,"is_preprint":false},{"pmid":"15313836","id":"PMC_15313836","title":"Loss of apolipoprotein E receptor LR11 in Alzheimer disease.","date":"2004","source":"Archives of neurology","url":"https://pubmed.ncbi.nlm.nih.gov/15313836","citation_count":280,"is_preprint":false},{"pmid":"25365775","id":"PMC_25365775","title":"Association of Brain DNA methylation in SORL1, ABCA7, HLA-DRB5, SLC24A4, and BIN1 with pathological diagnosis of Alzheimer disease.","date":"2015","source":"JAMA neurology","url":"https://pubmed.ncbi.nlm.nih.gov/25365775","citation_count":237,"is_preprint":false},{"pmid":"22279231","id":"PMC_22279231","title":"Retromer binds the FANSHY sorting motif in SorLA to regulate amyloid precursor protein sorting and processing.","date":"2012","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/22279231","citation_count":221,"is_preprint":false},{"pmid":"17646382","id":"PMC_17646382","title":"Sorting by the cytoplasmic domain of the amyloid precursor protein binding receptor SorLA.","date":"2007","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/17646382","citation_count":164,"is_preprint":false},{"pmid":"22996644","id":"PMC_22996644","title":"An intronic ncRNA-dependent regulation of SORL1 expression affecting Aβ formation is upregulated in post-mortem Alzheimer's disease brain samples.","date":"2012","source":"Disease models & mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/22996644","citation_count":157,"is_preprint":false},{"pmid":"11294867","id":"PMC_11294867","title":"Activation and functional characterization of the mosaic receptor SorLA/LR11.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11294867","citation_count":150,"is_preprint":false},{"pmid":"25382023","id":"PMC_25382023","title":"Coding mutations in SORL1 and Alzheimer disease.","date":"2015","source":"Annals of neurology","url":"https://pubmed.ncbi.nlm.nih.gov/25382023","citation_count":145,"is_preprint":false},{"pmid":"16489755","id":"PMC_16489755","title":"Molecular dissection of the interaction between amyloid precursor protein and its neuronal trafficking receptor SorLA/LR11.","date":"2006","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16489755","citation_count":140,"is_preprint":false},{"pmid":"20881129","id":"PMC_20881129","title":"Diabetes-associated SorCS1 regulates Alzheimer's amyloid-beta metabolism: evidence for involvement of SorL1 and the retromer complex.","date":"2010","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/20881129","citation_count":133,"is_preprint":false},{"pmid":"21220680","id":"PMC_21220680","title":"Meta-analysis of the association between variants in SORL1 and Alzheimer disease.","date":"2011","source":"Archives of neurology","url":"https://pubmed.ncbi.nlm.nih.gov/21220680","citation_count":132,"is_preprint":false},{"pmid":"24523320","id":"PMC_24523320","title":"Lysosomal sorting of amyloid-β by the SORLA receptor is impaired by a familial Alzheimer's disease mutation.","date":"2014","source":"Science translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/24523320","citation_count":132,"is_preprint":false},{"pmid":"28789839","id":"PMC_28789839","title":"Contribution to Alzheimer's disease risk of rare variants in TREM2, SORL1, and ABCA7 in 1779 cases and 1273 controls.","date":"2017","source":"Neurobiology of 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underexpressed, APP is sorted into Aβ-generating compartments, establishing SORL1 as a regulator of APP intracellular trafficking and amyloidogenic processing.\",\n      \"method\": \"Cell-based overexpression/knockdown with APP trafficking and Aβ production assays\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — foundational mechanistic study replicated across multiple subsequent labs\",\n      \"pmids\": [\"17220890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"SorLA/LR11 is synthesized as a proreceptor cleaved by furin in late Golgi compartments, activating the Vps10p domain for ligand binding; the receptor binds neuropeptides, receptor-associated protein, apolipoprotein E, and lipoprotein lipase, and mediates endocytosis from the cell surface while the major pool resides in late Golgi compartments.\",\n      \"method\": \"Furin cleavage assays, ligand binding assays, cell transfection, subcellular fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical assays with mutagenesis and multiple ligands characterized\",\n      \"pmids\": [\"11294867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The cytoplasmic tail of SorLA binds GGA1 and GGA2 adaptor proteins via a novel motif (ψ-ψ-X-X-φ) in the C-terminal segment, supporting a role for SorLA in Golgi-to-endosome sorting.\",\n      \"method\": \"Co-immunoprecipitation, pulldown assays, mutagenesis of cytoplasmic tail residues\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct binding assays with mutagenesis identifying critical residues\",\n      \"pmids\": [\"11821067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The SorLA/APP interaction is mediated by the cluster of complement-type repeats (CR cluster) in SorLA forming a 1:1 stoichiometric complex with the carbohydrate-linked domain of APP, resulting in APP sequestration in the Golgi and protection from amyloidogenic processing.\",\n      \"method\": \"FRET-based proximity assay, surface plasmon resonance, analytical ultracentrifugation of recombinant protein fragments\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal biophysical methods with domain mapping\",\n      \"pmids\": [\"16489755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"SorLA cytoplasmic tail mediates Golgi-to-endosome transport via an acidic cluster-dileucine-like motif and a GGA-binding site; AP-1 adaptor complex is essential for SorLA transport between Golgi membranes and endosomes; SNX1 and Vps35 (retromer) are involved in retraction of SorLA from endosomes.\",\n      \"method\": \"Chimeric receptor trafficking assays, AP-1 μ1-chain-deficient cell experiments, co-immunoprecipitation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including genetic (AP-1 deficiency) and biochemical approaches\",\n      \"pmids\": [\"17646382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SorLA is a substrate for presenilin-dependent γ-secretase cleavage, preceded by metalloprotease-dependent ectodomain shedding (α-secretase-like cleavage), analogous to other γ-secretase substrates.\",\n      \"method\": \"γ-secretase inhibitor treatment, PS1/PS2 knockout cells, metalloprotease inhibitor, PMA stimulation\",\n      \"journal\": \"Molecular neurodegeneration\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — pharmacological inhibitors and genetic knockouts used to establish cleavage pathway\",\n      \"pmids\": [\"16930450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"SorLA undergoes ectodomain shedding by a metalloprotease to release a soluble form; head activator (HA) stimulates SorLA translocation from internal membranes to the cell surface, its internalization, ectodomain shedding, and synthesis; blockade of shedding decreases cell proliferation, indicating SorLA mediates mitogenic HA signaling.\",\n      \"method\": \"Antisense oligonucleotides, metalloprotease inhibitors, ligand stimulation assays, cell proliferation assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional knockdown with defined phenotype and pharmacological inhibition\",\n      \"pmids\": [\"11082041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SorLA interacts with the retromer complex via a FANSHY sequence in its cytoplasmic domain recognized by the VPS26 subunit; this interaction is required for retrograde sorting of SorLA (and APP) from endosomes to the TGN. Mutations in the VPS26-binding site redistribute SorLA to endosomes and increase amyloidogenic APP processing despite retained APP-binding activity.\",\n      \"method\": \"Motif identification, mutagenesis, VPS26 knockdown, co-immunoprecipitation, APP processing assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution of interaction with defined motif, mutagenesis, and functional readout\",\n      \"pmids\": [\"22279231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GGA1 specifically mediates LR11 endocytic traffic; the LR11 GGA-binding motif (when mutated) alters endosomal distribution of LR11 and its effects on APP traffic and Aβ production. GGA1 knockdown reduces both LR11- and BACE1-mediated modulation of APP processing. Mutagenesis of BACE1 S498A enhances BACE1 targeting to LR11-positive compartments and nullifies LR11-mediated Aβ reduction.\",\n      \"method\": \"siRNA knockdown, GGA-binding motif mutagenesis, APP trafficking assays, Aβ ELISA\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple siRNA targets and mutagenesis with functional readouts\",\n      \"pmids\": [\"22621900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SorLA directs lysosomal targeting of nascent Aβ peptides by binding Aβ to its amino-terminal VPS10P domain; overexpression of SORLA in mice decreases brain Aβ levels. A familial AD mutation in SORL1 impairs Aβ binding to the VPS10P domain, revealing loss of SorLA's Aβ-sorting function as a disease mechanism.\",\n      \"method\": \"SORLA transgenic mouse model, brain Aβ measurement, domain binding assays, familial mutation functional testing\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo mouse model combined with molecular binding studies and disease mutation functional validation\",\n      \"pmids\": [\"24523320\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Crystal structure of the human SorLA VPS10p domain (ten-bladed β-propeller with a central tunnel) in unbound and Aβ-bound states reveals that Aβ and an internal propeptide ligand bind at the same tunnel site; SorLA VPS10p recognizes peptides in redundant modes without strict sequence dependence, favoring β-sheet-forming peptides.\",\n      \"method\": \"X-ray crystallography, structural analysis of ligand complexes\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structures with functional validation\",\n      \"pmids\": [\"25643321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ROCK2 (Rho-associated coiled-coil kinase 2) binds LR11/SorLA, co-immunoprecipitates from human brain tissue, and phosphorylates LR11 at serine 2206 in its cytoplasmic tail; ROCK2 knockdown decreases LR11 ectodomain shedding and increases intracellular LR11; S2206A mutation reduces LR11 shedding and phosphorylation and abrogates LR11-mediated Aβ reduction.\",\n      \"method\": \"LC-MS/MS kinase discovery, co-IP from brain, ROCK inhibitor treatment, siRNA knockdown, site-directed mutagenesis, in vitro phosphorylation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal methods including mutagenesis, in vitro kinase assay, and in vivo co-IP\",\n      \"pmids\": [\"21147781\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SORLA prevents APP oligomerization in cultured cells and in vivo in mouse brain, eliminating the preferred oligomeric substrate for secretases and causing secretases to switch to a less efficient non-allosteric mode; secretases are allosteric enzymes requiring APP oligomerization for efficient processing.\",\n      \"method\": \"Quantitative biochemical studies combined with mathematical modeling; cell and mouse brain APP oligomerization assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — quantitative biochemical and in vivo data with mathematical modeling\",\n      \"pmids\": [\"21989385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The SorLA CR-cluster (11 complement-type repeat domains) is essential for interaction with APP and for protection against APP processing; deletion of the CR-cluster abolishes APP interaction and protection; mutation of CR-domain fingerprint residues changes O-linked glycosylation of APP in the Golgi.\",\n      \"method\": \"Stable cell lines expressing SorLA deletion and point mutants, co-immunoprecipitation, Western blotting, ELISA for Aβ\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — domain deletion and mutagenesis with functional readouts\",\n      \"pmids\": [\"25525276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SORLA has distinct anterograde (GGA-dependent, lysosomal targeting of Aβ) and retrograde (retromer-dependent, TGN retrieval of APP) sorting functions in vivo; disruption of retromer binding causes SORLA accumulation in endosomes, depletion from TGN, and enhanced APP processing; disruption of GGA interaction does not affect APP processing but causes increased brain Aβ levels.\",\n      \"method\": \"Mouse models expressing SORLA trafficking mutants (GGA-binding or retromer-binding site mutations), APP processing and Aβ measurement in brain\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo mouse genetic models with distinct trafficking mutants and quantitative readouts\",\n      \"pmids\": [\"26377460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SNX27 binds the SORLA cytosolic tail to form a ternary complex with APP; SNX27 enhances cell-surface SORLA and APP levels and endosome-to-cell-surface recycling of APP; depletion of SNX27 reduces APP recycling in a SORLA-dependent manner; SNX27 overexpression increases non-amyloidogenic surface APP cleavage products in a SORLA-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, knockdown/overexpression, APP recycling kinetics assay, Aβ measurement\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal interaction demonstrated with functional trafficking readouts\",\n      \"pmids\": [\"27466343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"LR11 overexpression in cells enables binding and internalization of apolipoprotein E-rich lipoproteins (β-VLDL) with high affinity, mediates cholesteryl ester accumulation, and promotes lipid droplet formation; ApoE content of lipoproteins is a key determinant of high-affinity binding.\",\n      \"method\": \"LR11 transfection in hamster cells, ligand binding assays, lipoprotein endocytosis and degradation assays, cholesteryl ester accumulation\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct functional assays in transfected cells with defined ligands\",\n      \"pmids\": [\"11557679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"LR11 overexpression in smooth muscle cells increases migration and invasion via upregulation of cell-surface urokinase-type plasminogen activator receptor (uPAR); anti-uPA/uPAR antibodies abolish the LR11-dependent migration; LR11 decreases uPAR catabolism, increasing its cell-surface levels.\",\n      \"method\": \"LR11 cDNA transfection, migration/invasion assays, receptor-associated protein and antibody inhibition, uPAR expression analysis\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — defined mechanistic pathway with multiple inhibition strategies\",\n      \"pmids\": [\"11956127\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"LR11/SorLA deficiency in a mouse model of amyloidosis (APPswe/PS1ΔE9) significantly increases Aβ levels, exacerbates early amyloid pathology in a gene-dose-dependent manner, and increases processing of APP holo-molecule into α-, β-, and γ-secretase-derived metabolites, demonstrating that LR11 regulates APP processing and Aβ accumulation in vivo.\",\n      \"method\": \"LR11-deficient mice crossed with AD transgenic mice; Aβ measurement; amyloid pathology quantification\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic model with gene-dose effect and quantitative Aβ and pathology readouts\",\n      \"pmids\": [\"19036982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Soluble LR11 (sLR11) promotes vascular smooth muscle cell migration in an Ang II-dependent manner via activation of focal adhesion kinase/ERK/Rac1 and complex formation between uPAR and integrin αvβ3; LR11 gene disruption greatly reduces Ang II-induced SMC migration and arterial intimal thickening in mice.\",\n      \"method\": \"LR11 knockout mice, femoral artery cuff model, SMC migration assays, signaling pathway analysis by FAK/ERK/Rac1 activation, uPAR-integrin co-immunoprecipitation\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo knockout model with mechanistic pathway elucidation\",\n      \"pmids\": [\"18618022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SorLA acts as a sorting receptor for the GDNF/GFRα1 complex, directing it from the cell surface to endosomes for lysosomal degradation of GDNF while GFRα1 recycles; SorLA/GFRα1 complex also targets RET for endocytosis but not degradation, affecting GDNF-induced neurotrophic activities; SorLA-deficient mice display elevated GDNF levels, altered dopaminergic function, hyperactivity, and reduced anxiety.\",\n      \"method\": \"SorLA knockout mouse model, GDNF/GFRα1/RET trafficking assays, lysosomal degradation assays, behavioral phenotyping\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo knockout phenotype with defined trafficking mechanism\",\n      \"pmids\": [\"23333276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"α2A adrenergic receptor (α2AAR) activation disrupts APP interaction with SorLA in cells and mouse brain, reducing Golgi localization of APP and promoting APP distribution in endosomes and β-secretase cleavage; α2AAR genetic deficiency reduces Aβ generation and AD-related pathology.\",\n      \"method\": \"Co-immunoprecipitation of APP-SorLA complex, α2AAR knockout and agonist/antagonist treatments, APP localization by fractionation, Aβ measurement, AD mouse model\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic and pharmacological manipulations with mechanistic readout of APP-SorLA interaction\",\n      \"pmids\": [\"25404298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Soluble LR11/SorLA (sLR11) suppresses thermogenesis in adipose tissue in a cell-autonomous manner; mice lacking LR11 are protected from diet-induced obesity with increased browning of white adipose tissue; sLR11 inhibits thermogenesis via BMP/TGFβ signaling pathway and reduces Smad phosphorylation.\",\n      \"method\": \"LR11 knockout mice, diet-induced obesity model, adipocyte treatment with sLR11, Smad phosphorylation assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo knockout model with defined signaling mechanism (Smad phosphorylation)\",\n      \"pmids\": [\"26584636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SORLA acts as a sorting factor for the insulin receptor (IR) in adipocytes, redirecting internalized IR from endosomes to the plasma membrane, thereby enhancing IR surface expression and strengthening insulin signaling; SORLA overexpression in murine adipose tissue blocks triacylglyceride hydrolysis causing excessive adiposity, while Sorl1 inactivation accelerates lipolysis and protects from diet-induced obesity.\",\n      \"method\": \"Tissue-specific SORLA overexpression, Sorl1 knockout mice, IR trafficking assays, lipolysis measurements\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic mouse models with defined molecular mechanism\",\n      \"pmids\": [\"27322061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SORLA interacts with the EphA4 receptor tyrosine kinase and attenuates ephrinA1-induced EphA4 clustering and activation; SORLA transgenic mice show decreased EphA4 activation and redistribution to postsynaptic densities, with milder Aβ oligomer-induced LTP deficits and memory impairment; active EphA4 levels are elevated in human AD brains and inversely correlated with SORLA/EphA4 association.\",\n      \"method\": \"Co-immunoprecipitation of SORLA-EphA4, SORLA transgenic mice, LTP recordings, behavioral tests, human AD brain analysis\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct interaction demonstrated with in vivo functional consequences\",\n      \"pmids\": [\"29114064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SORLA co-precipitates with HER2 in cancer cells and promotes recycling of endosomal HER2 back to the plasma membrane; SORLA depletion triggers HER2 targeting to late endosomal/lysosomal compartments, impairs HER2-driven signaling and in vivo tumor growth, and disrupts lysosome function.\",\n      \"method\": \"Co-immunoprecipitation, SORLA knockdown, HER2 trafficking assays, in vivo tumor growth assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP with in vivo functional validation\",\n      \"pmids\": [\"31138794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SorLA mediates efficient cellular uptake of IL-6 and soluble IL-6 receptor (IL-6R) in astrocytes; SorLA interacts with membrane-bound IL-6R at the cell surface and downregulates IL-6 cis signaling; soluble SorLA ectodomain (shed form) acts as an IL-6 carrier protein stabilizing IL-6 for trans signaling.\",\n      \"method\": \"SorLA-mediated uptake assays in astrocytes, IL-6 signaling assays, co-immunoprecipitation, ectodomain shedding analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple functional assays establishing both direct interaction and signaling consequence\",\n      \"pmids\": [\"28265003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SORL1 depletion in hiPSC-derived neurons causes early endosome enlargement and altered APP localization in early endosomes (a site of BACE cleavage); this endosomal phenotype is selective to neurons (not microglia) and is independent of amyloidogenic APP processing, as BACE inhibition does not rescue endosome enlargement.\",\n      \"method\": \"CRISPR-Cas9 SORL1 depletion in hiPSCs, endosome size measurement, APP localization by immunofluorescence, BACE inhibitor treatment, comparison across cell types\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — isogenic CRISPR model with epistasis experiment (BACE inhibition) establishing pathway independence\",\n      \"pmids\": [\"32492427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SORL1 regulates endosomal trafficking and recycling of APP, TRKB, and GLUA1 in human hiPSC-derived neurons; SORL1 depletion impairs trafficking of all three cargoes to late endosomes/lysosomes and reduces recycling endosome-to-cell-surface delivery of APP and GLUA1; SORL1 overexpression enhances endosomal recycling; loss of GLUA1 recycling functionally impairs synaptic activity measured by MEA.\",\n      \"method\": \"Isogenic hiPSC SORL1 knockout/overexpression, confocal microscopy, cell surface recycling assays, lysosomal degradation assays, MEA recordings, RNA sequencing\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — isogenic human neuron model with multiple orthogonal methods and functional readout\",\n      \"pmids\": [\"35226190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Tetraspanin CD9 modulates ADAM17-mediated shedding of LR11 in leukocytes; CD9 colocalization with LR11 on the cell surface restrains shedding; CD9 knockdown or antibody blockade increases sLR11 release, which is abrogated by metalloprotease inhibitor GM6001.\",\n      \"method\": \"Confocal colocalization, CD9 overexpression/knockdown, neutralizing antibody, metalloprotease inhibitor, sLR11 ELISA\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological and genetic approaches with defined metalloprotease pathway\",\n      \"pmids\": [\"24699135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SorCS1 (a sortilin family member) forms complexes with APP, SorL1, and Vps35 recoverable from non-transgenic mouse brain; Sorcs1 hypomorphic female mice show decreased total SorL1 (29%) and Vps35 (49%) protein levels and increased endogenous murine Aβ40 and Aβ42, indicating SorCS1 functionally interacts with SorLA/retromer in APP/Aβ metabolism.\",\n      \"method\": \"Co-immunoprecipitation from mouse brain, Sorcs1 hypomorphic mouse model, Aβ ELISA, Western blot quantification\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP from brain and in vivo genetic model, but SorCS1-SorLA relationship indirect\",\n      \"pmids\": [\"20881129\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"An intronic antisense ncRNA (51A) mapping to intron 1 of SORL1 drives a splicing shift from canonical long SORL1 variant A to an alternatively spliced form, resulting in decreased SORL1 variant A synthesis and impaired APP processing leading to increased Aβ formation; 51A is upregulated in AD cerebral cortex.\",\n      \"method\": \"ncRNA overexpression, SORL1 isoform quantification, APP processing and Aβ assays, human brain expression analysis\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional ncRNA overexpression with defined splicing and Aβ readouts\",\n      \"pmids\": [\"22996644\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Rare SORL1 missense variants (S114R, R332W, G543E, S577P, R654W, and others) cause impaired SorLA maturation and endosomal trafficking by retaining the protein in the endoplasmic reticulum, reducing delivery of mature SorLA to the plasma membrane and endosomal system; R332W and R654W variants expressed at endogenous levels in hiPSCs increase Aβ secretion, demonstrating loss-of-function.\",\n      \"method\": \"HEK293 overexpression screen (70 variants), CRISPR/Cas9-modified hiPSCs, maturation assays, subcellular localization by immunofluorescence, Aβ ELISA\",\n      \"journal\": \"Acta neuropathologica communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — large variant screen validated in isogenic hiPSC model with functional Aβ readout\",\n      \"pmids\": [\"34922638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Soluble SORLA (sSORLA) binds and activates the EGF receptor (EGFR), triggering ERK activation and Fos upregulation to enhance neurite outgrowth and regeneration; pharmacological EGFR or ERK inhibition reverses sSORLA-dependent neurite outgrowth enhancement.\",\n      \"method\": \"SORLA transgenic neurons, sSORLA purification, co-precipitation of sSORLA with EGFR, EGFR phosphorylation assay, ERK activation, pharmacological inhibition, neurite outgrowth assays, RNAseq\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding demonstrated with pharmacological epistasis and functional readout\",\n      \"pmids\": [\"32601248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SorLA interacts directly with HER3 and forms a trimeric complex with HER2 and HER3, attenuating lysosomal degradation of the HER2-HER3 dimer in a Rab4-dependent recycling manner; heregulin-mediated signaling supports SorLA transcription downstream of the MAPK pathway; SorLA loss sensitizes cancer cells to neratinib.\",\n      \"method\": \"Co-immunoprecipitation of SorLA-HER3, Rab4-dependent recycling assays, SorLA knockdown, in vivo zebrafish xenograft, MAPK pathway inhibition\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct interaction with defined recycling mechanism and in vivo functional validation\",\n      \"pmids\": [\"33420373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SORLA dimerizes via its fibronectin-type-III (3Fn) and VPS10p domains within retromer-positive endosomal tubules; a SORLA fragment comprising the 3Fn, transmembrane, and cytoplasmic domains forms dimers and enhances retromer-dependent recycling of APP by decreasing amyloidogenic processing.\",\n      \"method\": \"X-ray crystallography, AlphaFold structural modeling, SORLA fragment functional assays, APP processing assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystallographic structure with functional validation of dimerization in recycling\",\n      \"pmids\": [\"36652482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Loss of SORL1 in neurons (but not astrocytes) causes cell-type-specific reduction of APOE and CLU (clusterin) and altered lipid profiles; TGF-β/SMAD signaling is implicated in SORL1 function; modulating SMAD signaling alters APOE RNA levels in a SORL1-dependent manner; retromer enhancement rescues tau phenotypes but not APOE levels in SORL1-null neurons.\",\n      \"method\": \"SORL1-null iPSCs differentiated to multiple cell types, RNA sequencing, APOE/CLU quantification, retromer rescue experiments, SMAD signaling modulation\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — isogenic multi-cell-type model with pathway rescue experiments\",\n      \"pmids\": [\"37611586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SORL1 haploinsufficiency in Göttingen minipigs (CRISPR-Cas9 engineered) phenocopies the preclinical in vivo AD biomarker profile of APP/PSEN1/PSEN2 mutations, with elevated Aβ and tau biofluid levels preceding amyloid plaque formation, supporting SORL1 haploinsufficiency as causal for AD through endosome cytopathology.\",\n      \"method\": \"CRISPR-Cas9 minipig SORL1 haploinsufficiency model, CSF and blood Aβ/tau biomarker measurement\",\n      \"journal\": \"Cell reports. Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — large animal in vivo genetic model with quantitative biomarker readouts\",\n      \"pmids\": [\"36099918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SorLA mediates polarized trafficking in neurons (somatodendritic domain) and epithelial MDCK cells (basolateral surface); polarized distribution depends on an acidic cluster motif and involves the AP-1 adaptor complex; SorLA can mediate transcytosis across tight cell layers.\",\n      \"method\": \"MDCK polarized cell trafficking, hippocampal neuron localization, AP-1 dependence, transcytosis assay\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined trafficking signals in polarized cells with functional transcytosis readout\",\n      \"pmids\": [\"27192064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Soluble LR11 (sLR11) regulates hypoxia-induced uPAR-mediated adhesion of hematopoietic stem and progenitor cells (HSPCs) to bone marrow stromal cells; hypoxia increases LR11 expression in HSPCs via HIF-1α binding to the LR11 promoter; lr11-/- mouse HSPCs show reduced hypoxia-enhanced attachment; sLR11 promotes HSPC adhesion through uPAR.\",\n      \"method\": \"LR11 knockout mice, HSPC adhesion assays, HIF-1α ChIP, uPAR blocking antibodies, U937 cell hypoxia experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo knockout model with defined signaling mechanism and promoter ChIP\",\n      \"pmids\": [\"23486467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The SORL1 missense variant p.R953C occurs at a critical position in the YWTD-domain and causes retention of SorLA in the ER, reducing maturation, shedding, and normal endosomal trafficking, consistent with a pathogenic loss-of-function mechanism for AD.\",\n      \"method\": \"Family sequencing, SORL1 variant functional studies in cells, ER retention assays, maturation and shedding assays\",\n      \"journal\": \"Acta neuropathologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional characterization in patient-derived variant context with defined cellular mechanism\",\n      \"pmids\": [\"38244079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Pharmacological enhancement of retromer (TPT-260, a retromer-stabilizing molecule) rescues endosomal, amyloid, and tau pathologies in SORL1-deficient, haploinsufficient, and variant-expressing hiPSC-derived cortical neurons; the degree of rescue depends on the number of functional SORL1 copies, establishing the SORL1-retromer axis as therapeutically targetable.\",\n      \"method\": \"hiPSC-derived cortical neurons with SORL1 CRISPR variants, TPT-260 treatment, retromer subunit quantification, endosome, Aβ, and tau phenotype assays\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — disease-relevant human cell model with pharmacological intervention and multiple readouts\",\n      \"pmids\": [\"37949073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"LR11 protein is localized mainly to neurons throughout the rat and human brain, with highest immunoreactivity in hippocampus, brainstem nuclei, and Purkinje cells; a unique single cytoplasmic punctum (putative botrysome) is observed near apical dendrites of pyramidal neurons, suggesting roles in intracellular trafficking.\",\n      \"method\": \"Immunohistochemistry in rat and human brain with anti-LR11 polyclonal antibody\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment in multiple species with quantitative description\",\n      \"pmids\": [\"10375696\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SORL1/SorLA is a large multidomain neuronal sorting receptor that regulates the intracellular trafficking of APP and other cargoes (including GLUA1, TRKB, HER2, HER3, insulin receptor, IL-6R, and GDNF/GFRα1) by cycling between the TGN, endosomes, and the plasma membrane through interactions with cytosolic adaptors GGA1/2, the retromer complex (via a FANSHY-VPS26 interaction), AP-1, and SNX27; retromer-dependent retrograde sorting retrieves APP from endosomes to the TGN to prevent amyloidogenic processing, while GGA-dependent anterograde sorting directs newly generated Aβ to lysosomes for degradation; ROCK2-mediated phosphorylation of the cytoplasmic tail at S2206 regulates ectodomain shedding (executed by ADAM17, modulated by tetraspanin CD9), releasing a soluble form that activates EGFR/ERK signaling and modulates uPAR-mediated cell migration; loss-of-function variants or haploinsufficiency cause endosomal enlargement, increased Aβ production, reduced APOE/CLU levels via TGF-β/SMAD signaling, and elevated tau, establishing SORL1 as a causal Alzheimer's disease gene.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SORL1 encodes SorLA, a multidomain type I transmembrane sorting receptor that functions as a master regulator of intracellular vesicular trafficking, directing the endosomal fate of APP and multiple other transmembrane cargoes including TRKB, GLUA1, HER2/HER3, insulin receptor, IL-6R, and the GDNF/GFRα1 complex [PMID:17220890, PMID:35226190, PMID:31138794, PMID:33420373, PMID:27322061, PMID:28265003, PMID:23333276]. SorLA cycles between the TGN, endosomes, and the plasma membrane through interactions with the retromer complex (via a FANSHY–VPS26 interaction), GGA1/2, AP-1, and SNX27; retromer-dependent retrograde sorting retrieves APP from endosomes to the TGN to prevent amyloidogenic processing, while GGA-dependent anterograde sorting targets newly generated Aβ peptides to lysosomes for degradation via the VPS10p domain [PMID:22279231, PMID:11821067, PMID:17646382, PMID:27466343, PMID:26377460, PMID:24523320]. SorLA dimerizes through its fibronectin-type-III and VPS10p domains within retromer-positive endosomal tubules to enhance APP recycling, and its ectodomain undergoes ADAM17-mediated shedding—modulated by ROCK2 phosphorylation at S2206 and tetraspanin CD9—releasing a soluble form (sSORLA) that activates EGFR/ERK signaling to promote neurite outgrowth [PMID:36652482, PMID:21147781, PMID:24699135, PMID:32601248]. Loss-of-function variants and haploinsufficiency cause endosomal enlargement, increased Aβ production, elevated tau, and reduced APOE/CLU levels, establishing SORL1 as a causal Alzheimer's disease gene [PMID:34922638, PMID:36099918, PMID:37611586, PMID:32492427].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Before functional characterization, SorLA's expression pattern needed mapping; immunohistochemistry revealed that LR11/SorLA is a predominantly neuronal protein enriched in hippocampus and brainstem, establishing the brain as a primary site of function.\",\n      \"evidence\": \"Immunohistochemistry in rat and human brain with polyclonal anti-LR11 antibody\",\n      \"pmids\": [\"10375696\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single antibody used without knockout validation\", \"Subcellular compartment identity of the cytoplasmic punctum unresolved\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Early work established that SorLA undergoes metalloprotease-mediated ectodomain shedding and that this shedding is linked to mitogenic signaling via head activator, revealing SorLA as both a trafficking receptor and a signaling intermediate.\",\n      \"evidence\": \"Antisense knockdown, metalloprotease inhibition, and cell proliferation assays in neuronal cell lines\",\n      \"pmids\": [\"11082041\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Shedding protease identity not defined\", \"Head activator pathway relevance to mammalian physiology uncertain\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Biochemical characterization showed that SorLA is furin-cleaved in the late Golgi to activate its VPS10p domain for ligand binding (including ApoE and RAP), and that the receptor can mediate endocytosis of ApoE-rich lipoproteins, establishing SorLA as a multifunctional endocytic receptor.\",\n      \"evidence\": \"Furin cleavage assays, ligand binding studies, lipoprotein internalization and cholesteryl ester accumulation assays in transfected cells\",\n      \"pmids\": [\"11294867\", \"11557679\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of lipoprotein uptake in neurons versus peripheral tissues unclear\", \"Post-furin trafficking itinerary not resolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of GGA1/2 binding to a ψ-ψ-X-X-φ motif in the SorLA cytoplasmic tail and the discovery that SorLA promotes uPAR-dependent cell migration established two key functional axes: Golgi-to-endosome sorting via coat adaptors and regulation of cell motility.\",\n      \"evidence\": \"Co-IP and pulldown with mutagenesis of tail residues; SMC migration/invasion assays with uPAR-blocking antibodies\",\n      \"pmids\": [\"11821067\", \"11956127\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether GGA and uPAR pathways are mechanistically linked was unknown\", \"In vivo relevance of SorLA in vascular remodeling not yet tested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Biophysical studies defined the molecular basis of the SorLA–APP interaction: the complement-type repeat (CR) cluster forms a 1:1 complex with the APP carbohydrate-linked domain, sequestering APP in the Golgi and protecting it from amyloidogenic processing; simultaneously, SorLA was shown to be a γ-secretase substrate.\",\n      \"evidence\": \"SPR, analytical ultracentrifugation, FRET proximity assays; PS1/PS2 knockout cells and γ-secretase inhibitors\",\n      \"pmids\": [\"16489755\", \"16930450\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether γ-secretase cleavage of SorLA has a signaling function was unknown\", \"CR-cluster domain requirement not yet tested by deletion mutagenesis\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Functional studies demonstrated that SorLA directs APP into recycling pathways and that loss of SorLA shunts APP into Aβ-generating compartments; parallel work mapped the AP-1, GGA, and retromer (VPS35/SNX1) machinery controlling SorLA trafficking between Golgi and endosomes.\",\n      \"evidence\": \"Cell-based APP trafficking/Aβ assays with SORL1 knockdown/overexpression; chimeric receptor trafficking in AP-1-deficient cells, co-IP with retromer subunits\",\n      \"pmids\": [\"17220890\", \"17646382\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise retromer binding motif on SorLA unidentified\", \"In vivo genetic evidence for SorLA's protective role lacking\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"In vivo genetic models validated SorLA as a dose-dependent regulator of APP processing and Aβ accumulation, and showed that soluble SorLA promotes vascular SMC migration via FAK/ERK/Rac1 and uPAR–integrin complexes.\",\n      \"evidence\": \"LR11-deficient mice crossed with APPswe/PS1ΔE9 AD model; LR11 knockout femoral artery cuff model with signaling assays\",\n      \"pmids\": [\"19036982\", \"18618022\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which SorLA dosage controls secretase access not defined\", \"Whether vascular and neuronal functions intersect in AD pathogenesis unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"ROCK2 was identified as a kinase that phosphorylates SorLA at S2206, regulating ectodomain shedding; this provided the first post-translational switch controlling SorLA surface levels and thereby Aβ reduction.\",\n      \"evidence\": \"LC-MS/MS kinase screen, co-IP from human brain, S2206A mutagenesis, in vitro kinase assay\",\n      \"pmids\": [\"21147781\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other kinases or phosphatases regulate SorLA tail phosphorylation unknown\", \"Physiological signals activating ROCK2-SorLA axis in neurons not identified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"The FANSHY motif in SorLA's cytoplasmic tail was mapped as the VPS26-binding site required for retromer-mediated endosome-to-TGN retrieval; disruption of this motif redistributed SorLA to endosomes and increased amyloidogenic processing, completing the molecular logic of SorLA's retrograde sorting.\",\n      \"evidence\": \"Motif identification, VPS26 knockdown, mutagenesis, APP processing assays\",\n      \"pmids\": [\"22279231\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of the VPS26–FANSHY complex unresolved\", \"Whether other retromer subunits contribute to SorLA recognition unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"GGA1 was shown to specifically mediate endocytic LR11 traffic affecting BACE1 localization and Aβ production, and SorLA was found to prevent APP oligomerization needed for efficient allosteric secretase cleavage, revealing a second mechanism (beyond compartmental segregation) by which SorLA suppresses Aβ generation.\",\n      \"evidence\": \"GGA-binding motif mutagenesis with siRNA; quantitative biochemical/mathematical modeling of APP oligomerization in cells and mouse brain\",\n      \"pmids\": [\"22621900\", \"21989385\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of SorLA-mediated monomerization of APP unknown\", \"Relative contributions of trafficking vs. oligomerization mechanisms not quantified in vivo\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"SorLA's cargo repertoire was expanded beyond APP to include the GDNF/GFRα1 complex (directing GDNF to lysosomes while recycling GFRα1) and soluble LR11-mediated uPAR-dependent HSPC adhesion, demonstrating SorLA as a general-purpose sorting receptor for diverse ligands.\",\n      \"evidence\": \"SorLA knockout mice with GDNF/RET trafficking and behavioral phenotyping; lr11−/− HSPC adhesion assays with HIF-1α ChIP\",\n      \"pmids\": [\"23333276\", \"23486467\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SorLA discriminates among diverse cargoes for lysosomal versus recycling routes unclear\", \"Neuronal consequences of GDNF mis-sorting in AD context not explored\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"SorLA's VPS10p domain was shown to directly bind Aβ peptides and direct them to lysosomes for degradation, and a familial AD mutation in this domain impaired Aβ binding, linking loss of Aβ-sorting function to disease; separately, α2A-adrenergic receptor activation was shown to disrupt the SorLA–APP complex and promote amyloidogenic processing.\",\n      \"evidence\": \"SORLA transgenic mice, domain binding assays, disease mutation testing; α2AAR knockout and pharmacological manipulation with APP-SorLA co-IP\",\n      \"pmids\": [\"24523320\", \"25404298\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether adrenergic modulation of SorLA–APP is therapeutically exploitable unknown\", \"Range of FAD-linked VPS10p mutations affecting Aβ binding not systematically mapped\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Crystal structure of the VPS10p domain revealed a ten-bladed β-propeller with a central tunnel binding Aβ and propeptide through redundant β-sheet-recognition modes; CR-cluster deletion confirmed its necessity for APP interaction; in vivo mouse models with distinct GGA- and retromer-binding mutations dissected anterograde versus retrograde sorting functions.\",\n      \"evidence\": \"X-ray crystallography; CR-cluster deletion mutagenesis; knock-in mice with GGA-binding or retromer-binding site mutations\",\n      \"pmids\": [\"25643321\", \"25525276\", \"26377460\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length SorLA structure not determined\", \"How VPS10p tunnel accommodates larger cargoes unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"SNX27 was identified as a new SorLA adaptor forming a ternary complex with APP to promote endosome-to-surface recycling; SorLA was also shown to sort the insulin receptor back to the plasma membrane in adipocytes, strengthening insulin signaling and controlling lipolysis, and to mediate polarized trafficking via AP-1-dependent basolateral/somatodendritic targeting.\",\n      \"evidence\": \"Co-IP and recycling kinetics in neurons; tissue-specific SORLA overexpression and Sorl1 KO in mice; MDCK and hippocampal neuron polarized trafficking assays\",\n      \"pmids\": [\"27466343\", \"27322061\", \"27192064\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SNX27 binding site on SorLA tail not mapped\", \"Whether metabolic and neuronal sorting functions use the same tail motifs unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"SorLA was shown to attenuate EphA4 receptor clustering and activation, protecting against Aβ oligomer-induced synaptic toxicity, and to modulate IL-6 signaling by mediating uptake of IL-6/IL-6R in astrocytes while soluble SorLA stabilizes IL-6 for trans signaling.\",\n      \"evidence\": \"Co-IP of SORLA-EphA4, SORLA transgenic mice with LTP/behavioral tests, human AD brain analysis; astrocyte IL-6 uptake and signaling assays\",\n      \"pmids\": [\"29114064\", \"28265003\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether EphA4 attenuation is a direct trafficking or competition effect not resolved\", \"In vivo neuroinflammatory consequences of SorLA-IL-6R axis unexplored\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"In cancer cells, SorLA was found to recycle endosomal HER2 to the plasma membrane; SORLA depletion diverted HER2 to lysosomes, impairing HER2-driven signaling and tumor growth, later extended to a SorLA–HER3 trimeric complex with Rab4-dependent recycling.\",\n      \"evidence\": \"Co-IP, SORLA knockdown, HER2 trafficking, in vivo tumor assays; SorLA-HER3 co-IP, Rab4 dependence, zebrafish xenograft\",\n      \"pmids\": [\"31138794\", \"33420373\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SorLA sorting of oncogenic RTKs is mechanistically identical to APP sorting untested\", \"Structural basis of SorLA–HER2/HER3 interaction unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"SORL1 depletion in hiPSC-derived neurons caused early endosome enlargement independent of amyloidogenic processing, establishing endosomal dysfunction as a primary consequence of SORL1 loss; soluble SorLA was shown to bind and activate EGFR/ERK to promote neurite outgrowth.\",\n      \"evidence\": \"CRISPR SORL1-null iPSC neurons with BACE inhibitor epistasis; sSORLA-EGFR co-precipitation, ERK assays, neurite outgrowth with pharmacological inhibition\",\n      \"pmids\": [\"32492427\", \"32601248\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular cargo driving endosome enlargement upon SORL1 loss not identified\", \"Whether sSORLA-EGFR signaling is neuroprotective in vivo unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Systematic functional screening of rare SORL1 missense variants demonstrated that pathogenic variants cause ER retention, impaired maturation, and loss of endosomal trafficking, with isogenic hiPSC validation showing increased Aβ secretion, firmly establishing SORL1 loss-of-function as a monogenic AD mechanism.\",\n      \"evidence\": \"HEK293 overexpression screen of 70 variants, CRISPR-modified hiPSCs with maturation and Aβ assays\",\n      \"pmids\": [\"34922638\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Not all variants tested at endogenous expression levels\", \"Genotype-phenotype correlation for clinical severity not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"SORL1's role as a general neuronal sorting receptor was confirmed: SORL1 regulates trafficking and recycling of TRKB and GLUA1 in addition to APP, with loss of GLUA1 recycling impairing synaptic function; SORL1 haploinsufficiency in minipigs phenocopied APP/PSEN mutation biomarker profiles with elevated Aβ and tau preceding plaques.\",\n      \"evidence\": \"Isogenic hiPSC neurons with KO/overexpression, MEA recordings; CRISPR-Cas9 SORL1+/− Göttingen minipigs with CSF biomarkers\",\n      \"pmids\": [\"35226190\", \"36099918\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full synaptic cargo repertoire of SORL1 not defined\", \"Whether haploinsufficiency is sufficient for clinical AD in humans with complete penetrance unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Structural work revealed that SORL1 dimerizes via 3Fn and VPS10p domains in retromer-positive tubules to enhance APP recycling, and transcriptomic studies in SORL1-null neurons showed cell-type-specific reduction of APOE and CLU via TGF-β/SMAD signaling; retromer stabilization by TPT-260 rescued endosomal, Aβ, and tau phenotypes dose-dependently.\",\n      \"evidence\": \"X-ray crystallography of 3Fn dimer; SORL1-null iPSC neurons with RNA-seq, SMAD modulation, retromer rescue; TPT-260 pharmacological rescue in hiPSC neurons\",\n      \"pmids\": [\"36652482\", \"37611586\", \"37949073\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SORL1 dimerization is regulated or constitutive unknown\", \"Molecular link between SORL1 loss and SMAD-dependent APOE downregulation not fully resolved\", \"In vivo efficacy of retromer stabilizers for SORL1-driven AD not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include the full-length SorLA structure, how SorLA selects among its diverse cargoes for distinct endosomal fates, whether retromer-stabilizing compounds rescue AD phenotypes in vivo, and the clinical penetrance of heterozygous loss-of-function variants in human populations.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length SorLA structure not determined\", \"Cargo selectivity mechanism unresolved\", \"In vivo therapeutic validation of retromer stabilizers lacking\", \"Penetrance of SORL1 haploinsufficiency in humans not quantified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [0, 9, 20, 23, 25, 28]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [1, 16]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 4, 7, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [1, 3, 4]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [7, 14, 27, 28]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [6, 15, 23]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [4, 14, 38]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 4, 7, 14, 15, 28, 35]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [2, 8, 14, 38]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [9, 32, 37]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [22, 33, 34]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [24, 28]}\n    ],\n    \"complexes\": [\n      \"Retromer complex (via VPS26-FANSHY interaction)\",\n      \"SorLA-APP complex\",\n      \"SorLA-HER2-HER3 trimeric complex\"\n    ],\n    \"partners\": [\n      \"APP\",\n      \"VPS26A\",\n      \"GGA1\",\n      \"SNX27\",\n      \"ROCK2\",\n      \"EGFR\",\n      \"ERBB2\",\n      \"ERBB3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}