{"gene":"DCC","run_date":"2026-06-09T23:54:41","timeline":{"discoveries":[{"year":1996,"finding":"DCC (Deleted in Colorectal Cancer) encodes a netrin-1 receptor: DCC protein binds netrin-1, is expressed on spinal commissural axons, and an anti-DCC antibody selectively blocks netrin-1-dependent commissural axon outgrowth in vitro.","method":"Netrin-1 binding assay, antibody blocking of commissural axon outgrowth in vitro","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct ligand-binding assay combined with functional antibody blocking experiment, replicated across multiple organisms (C. elegans, Drosophila, vertebrate)","pmids":["8861902"],"is_preprint":false},{"year":1998,"finding":"DCC induces apoptosis in the absence of netrin-1 ligand (dependence receptor activity); netrin-1 engagement blocks apoptosis. DCC is a caspase-3 substrate cleaved at Asp1290, and mutation of this cleavage site abolishes DCC's pro-apoptotic effect.","method":"Cell-based apoptosis assays, site-directed mutagenesis of caspase-3 cleavage site (D1290), caspase substrate assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic assay (caspase cleavage), active-site mutagenesis abolishing function, multiple orthogonal methods in one study","pmids":["9796814"],"is_preprint":false},{"year":2001,"finding":"DCC drives caspase-3 activation through caspase-9 independently of the mitochondrial pathway (cytochrome c/Apaf-1-independent) and independently of the death receptor/caspase-8 pathway. DCC physically interacts with both caspase-3 and caspase-9.","method":"Co-immunoprecipitation of DCC with caspase-3 and caspase-9; cell-based apoptosis assays with pathway inhibitors","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP with caspase-3/9 and functional cell-based assays, single lab","pmids":["11248093"],"is_preprint":false},{"year":2002,"finding":"DCC promotes filopodia formation and cell spreading by activating Cdc42 and Rac1 in a netrin-1-dependent manner. Dominant-negative Cdc42 blocks netrin-1-induced filopodia increase, and dominant-negative Rac1 blocks cell surface area increase downstream of DCC.","method":"Ectopic DCC expression in HEK293T/NG108-15 cells, dominant-negative Cdc42/Rac1 co-expression, GTPase activation assays","journal":"Molecular and cellular neurosciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dominant-negative epistasis combined with GTPase activation assays, single lab","pmids":["11817894"],"is_preprint":false},{"year":2002,"finding":"DIP13α (a protein with PH and PTB domains) interacts with the DCC cytoplasmic domain and mediates DCC-induced apoptosis; co-expression of DCC and DIP13α produces ~5-fold increase in apoptosis, and siRNA knockdown of DIP13α blocks DCC-induced apoptosis.","method":"Co-immunoprecipitation, domain-deletion mutants, siRNA knockdown, cell-based apoptosis assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP identifying binding partner, siRNA loss-of-function with specific phenotypic readout, domain mapping, single lab","pmids":["12011067"],"is_preprint":false},{"year":2003,"finding":"Netrin-1 binds exclusively to the fifth fibronectin type III (FN5) repeat of DCC with 1:1 stoichiometry. The loop on FN5 previously implicated in heparin binding is actually important for netrin binding; DCC-heparin interactions are mediated indirectly through netrin.","method":"Purified soluble netrin fragment pull-down assay, cross-linking experiments, stoichiometric analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstituted binding with defined domain mapping and mutagenesis-equivalent deletion analysis, single lab with multiple orthogonal methods","pmids":["12810718"],"is_preprint":false},{"year":2004,"finding":"PKA activation promotes translocation of DCC from an intracellular vesicular pool to the plasma membrane in embryonic spinal commissural neurons, selectively increasing cell-surface DCC and enhancing axon outgrowth in response to netrin-1. Inhibiting adenylate cyclase, PKA, or exocytosis blocks DCC translocation.","method":"Cell surface biotinylation, immunofluorescence of intracellular vs. plasma membrane DCC pools, pharmacological inhibition of PKA and exocytosis","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization experiment (fractionation + imaging) tied to functional axon outgrowth consequence, multiple pharmacological interventions, single lab with orthogonal methods","pmids":["15044543"],"is_preprint":false},{"year":2004,"finding":"Fyn (Src family kinase), but not Src, phosphorylates the DCC intracellular domain in vitro; DCC is phosphorylated on tyrosine in vivo upon netrin-1 stimulation. Y1418 is crucial for DCC axon outgrowth function. DCC phosphorylation and netrin-1-induced axon outgrowth are impaired in Fyn-/- neurons.","method":"In vitro kinase assay with Fyn/Src on DCC intracellular domain, site-directed mutagenesis (Y1418), Fyn-/- mouse commissural neuron explants","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay, mutagenesis of key phosphorylation site, genetic loss-of-function (Fyn KO) with defined phenotype","pmids":["15557120"],"is_preprint":false},{"year":2006,"finding":"DCC localization to lipid rafts is required for its pro-apoptotic (dependence receptor) activity in both immortalized cells and primary neurons. Disruption of lipid rafts inhibits the interaction of caspase-9 with DCC.","method":"Lipid raft fractionation, pharmacological disruption of lipid rafts, co-immunoprecipitation of caspase-9 with DCC, cell-based apoptosis assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — subcellular fractionation linked to functional apoptosis readout, co-IP of caspase-9 with DCC, single lab","pmids":["16537496"],"is_preprint":false},{"year":2006,"finding":"DCC associates with ezrin (and merlin) via a juxtamembrane ERM-binding domain; this interaction was demonstrated by in vitro pull-down of the DCC cytoplasmic domain with ezrin N-terminal region and confirmed by co-immunoprecipitation in COS-1 cells. DCC expression alters actin cytoskeleton organization and cell adhesion properties.","method":"In vitro pull-down assay, co-immunoprecipitation in transfected COS-1 cells, cell morphology and adhesion assays in DCC-transfected HT-29 cells","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro pull-down and co-IP identifying DCC-ezrin interaction, functional cell adhesion assay, single lab","pmids":["16762451"],"is_preprint":false},{"year":2007,"finding":"Cell-autonomous expression of heparan sulfate (HS) by commissural neurons is required for netrin-1/DCC signaling. Ext1 ablation (eliminating HS synthesis) in dorsal spinal cord neurons causes commissural axon guidance defects similar to netrin-1/DCC loss-of-function. Intracellular signaling downstream of netrin-1/DCC is defective in Ext1-deficient neurons and in DCC-transfected cells from which HS was removed.","method":"Conditional Ext1 knockout (Wnt1-Cre), commissural axon pathfinding analysis, explant outgrowth assay, DCC signaling readouts in HEK293T cells","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional KO genetic epistasis, supported by in vitro cell-based signaling assays, multiple orthogonal approaches","pmids":["17442818"],"is_preprint":false},{"year":2009,"finding":"Netrin-1 binding to Dcc on mature oligodendrocytes recruits Fyn to a complex with the Dcc intracellular domain that includes FAK and N-WASP, resulting in RhoA inhibition and promoting process remodeling. Fyn kinase (Src family) activity is required downstream of netrin-1-dependent process extension; Fyn-/- oligodendrocytes fail to branch in response to netrin-1.","method":"Co-immunoprecipitation of Fyn/FAK/N-WASP with Dcc intracellular domain, Fyn-/- mouse oligodendrocytes, RhoA activity assays, in vitro process branching assays","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP identifying multiprotein complex, Fyn KO functional validation, RhoA GTPase assay, single lab with multiple orthogonal methods","pmids":["19141671"],"is_preprint":false},{"year":2010,"finding":"DCC forms a binding complex with multiple translation components including eukaryotic initiation factors, ribosomal large and small subunits, and monosomes. Netrin-1 promotes DCC-mediated translation and causes dissociation of translation components from DCC. DCC colocalizes with translation machinery in neuronal axons and dendrites.","method":"Co-immunoprecipitation of DCC with translation initiation factors and ribosomal subunits, polysome profiling, in situ detection of newly synthesized protein, netrin-1 stimulation assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP identifying multiprotein translation complex, functional translation assay, subcellular localization, multiple orthogonal methods, single lab","pmids":["20434207"],"is_preprint":false},{"year":2010,"finding":"ERK2 (MAPK) directly interacts with the DCC intracellular P1 domain via a MAPK docking motif. Crystal structure of ERK2-P1 domain complex reveals physical positioning of DCC phosphorylation sites near the kinase active site. The docking interaction is essential for ERK2-mediated phosphorylation of DCC.","method":"Crystal structure (X-ray crystallography) of ERK2-DCC P1 complex, mutagenesis of docking motif, in vitro kinase phosphorylation assay","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with functional validation by mutagenesis and in vitro kinase assay, single lab","pmids":["21070949"],"is_preprint":false},{"year":2011,"finding":"DCC deletion from neurons in the adult forebrain results in loss of LTP, shorter dendritic spines, and impaired spatial/recognition memory. DCC deletion severely reduces Src activation; enhancing NMDAR function or activating Src rescues LTP in DCC-null neurons, placing DCC upstream of Src-dependent NMDAR activation required for LTP.","method":"Conditional neuron-specific DCC knockout, LTP electrophysiology, Src kinase activity assay, NMDAR function rescue experiments, dendritic spine morphology analysis","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with multiple orthogonal readouts (LTP, spine morphology, Src activity, behavioral memory), rescue experiments establishing pathway position","pmids":["23291093"],"is_preprint":false},{"year":2011,"finding":"Genetic silencing of DCC's pro-apoptotic activity in mice leads to spontaneous intestinal neoplasia and increases number and aggressiveness of intestinal tumors in APC-mutant background, demonstrating that DCC suppresses tumor progression via its dependence receptor (pro-apoptotic) activity.","method":"Transgenic mouse model with silenced DCC pro-apoptotic activity, tumor development monitoring, APC-mutant cross","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function mouse model with defined cellular mechanism (apoptosis) and tumor suppression phenotype, double-mutant epistasis","pmids":["22158121"],"is_preprint":false},{"year":2014,"finding":"TRIM9-dependent ubiquitination of DCC blocks DCC interaction with FAK and prevents FAK phosphorylation. Upon netrin-1 stimulation, TRIM9 promotes DCC multimerization but reduces DCC ubiquitination, enabling FAK-DCC interaction and FAK activation, which then promotes exocytic vesicle fusion and axon branching.","method":"Co-immunoprecipitation of DCC-FAK, ubiquitination assays, FAK kinase activity assay, exocytosis frequency measurement, in vitro and in vivo axon branching assays","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — PTM (ubiquitination) identified with writer (TRIM9), functional consequences on DCC-FAK interaction and downstream signaling established with multiple orthogonal methods","pmids":["28701345"],"is_preprint":false},{"year":2014,"finding":"Cerebellin-4 (CBLN4) is a bona fide extracellular ligand of DCC, binding within the membrane-proximal fibronectin type III domains (FN4-6) of DCC, overlapping with the netrin-1 binding site. Netrin-1 competes with CBLN4 for DCC binding with ~5-fold higher affinity. CBLN4 also binds neogenin-1 with lower affinity than DCC.","method":"Extracellular protein microarray interaction screen, immunofluorescence, radio-ligand binding competition assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — protein microarray plus radio-ligand competition assay identifying new DCC ligand and binding site, single lab","pmids":["24400119"],"is_preprint":false},{"year":2016,"finding":"NOVA RNA-binding proteins regulate alternative splicing of Dcc mRNA; Nova deficiency disrupts DCC splice variant production. Restoring correct Dcc splicing in Nova knockouts rescues commissural neuron migration, axon outgrowth, and axon guidance defects.","method":"In vivo RNAi screen in dorsal spinal cord, splicing analysis, rescue by restoring Dcc splicing in Nova knockout","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with rescue experiment establishing post-transcriptional regulation of DCC by NOVA splicing, single lab","pmids":["27223328"],"is_preprint":false},{"year":2016,"finding":"miR-218 acts as a posttranscriptional repressor of DCC in prefrontal cortex pyramidal neurons. Exaggerated DCC expression (with reduced miR-218) in PFC leads to vulnerability to stress-induced social avoidance and anhedonia. Upregulation of Dcc in PFC pyramidal neurons causes susceptibility to depression-like behaviors.","method":"miRNA-target reporter assay, in vitro and in vivo miR-218/DCC expression analysis, viral-mediated Dcc overexpression in mouse PFC with behavioral readout","journal":"Biological psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — miRNA-target validation combined with viral OE and behavioral phenotype, single lab, multiple orthogonal methods","pmids":["27773352"],"is_preprint":false},{"year":2017,"finding":"Unc5C and DCC expression are under direct negative transcriptional regulation by Satb2 and Ctip2 respectively in neocortical neurons. Netrin1-Unc5C/DCC interaction controls interhemispheric (callosal) projections in deep-layer neurons.","method":"Genetic epistasis (Satb2 and Ctip2 mutant mice), in situ hybridization, in utero electroporation","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis placing DCC downstream of Ctip2 in axon guidance, single lab","pmids":["24739528"],"is_preprint":false},{"year":2018,"finding":"Crystal/solution structures of Draxin/DCC and Draxin/Netrin-1 complexes reveal: Draxin interacts with DCC through N-terminal four immunoglobulin domains, and with Netrin-1 through its EGF-3 domain. Netrin-1 and DCC bind adjacent sites on Draxin, forming a triangular complex. This arrangement affects Netrin-mediated haptotaxis and axon fasciculation.","method":"X-ray crystallography and SAXS solution structures of Draxin/DCC and Draxin/Netrin-1 complexes, functional haptotaxis and fasciculation assays","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with functional validation (haptotaxis and fasciculation assays), single lab with structural and functional orthogonal methods","pmids":["29503192"],"is_preprint":false},{"year":2018,"finding":"Netrin-1/DCC activates PLCγ1 through Src kinase to induce actin cytoskeleton rearrangement. Neuronal progenitor-specific knockout of Plcg1 causes axon guidance defects and white matter structural alterations, placing PLCγ1 downstream of netrin-1/DCC signaling.","method":"Conditional Plcg1 knockout in neuronal progenitors, PLCγ1 activation assay downstream of DCC, actin rearrangement assays, brain structural MRI/histology","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO epistasis placing PLCγ1 downstream of DCC/Src, with in vitro signaling and in vivo structural phenotypes, single lab","pmids":["30224412"],"is_preprint":false},{"year":2019,"finding":"miR-9 directly targets Dcc mRNA via its 3′-UTR, represses DCC expression, and suppresses Schwann cell migration. let-7 targets Netrin-1. miR-9-mediated downregulation of DCC reduces axon outgrowth in dorsal root ganglion neurons.","method":"qRT-PCR, reporter gene (3′-UTR) assay, biochemical expression analysis, Schwann cell migration assay, DRG axon outgrowth assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — 3′-UTR reporter assay validating miR-9 as DCC repressor, combined with functional migration/axon outgrowth assays, single lab","pmids":["30626732"],"is_preprint":false},{"year":2020,"finding":"Silencing netrin-1 in the adult mouse substantia nigra induces DCC cleavage and significant loss of dopamine neurons, producing motor deficits. Overexpression or brain administration of recombinant netrin-1 is neuroprotective and neurorestorative in mouse/rat PD models, demonstrating that netrin-1/DCC signaling governs adult dopamine neuron survival.","method":"AAV-mediated netrin-1 silencing in substantia nigra, DCC cleavage Western blot, dopamine neuron stereological counting, behavioral motor assays, pharmacological netrin-1 administration in PD models","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function (silencing) and gain-of-function (OE/recombinant protein) both confirm mechanism, multiple animal models, DCC cleavage as molecular readout","pmids":["33351190"],"is_preprint":false},{"year":2020,"finding":"Pre- and postsynaptic DCC contribute distinctly to hippocampal synaptic plasticity: DCC loss from CA1 postsynaptic neurons impairs spatial memory, alters dendritic spine morphology, and reduces postsynaptic adaptor/signaling proteins (but LTP remains intact), while DCC loss from CA3 presynaptic neurons impairs LTP at Schaffer collateral synapses and novel object recognition without altering CA1 intrinsic properties.","method":"Hippocampal subregion-specific conditional DCC deletion, LTP electrophysiology, dendritic spine morphology, behavioral memory tasks, electrophysiological recording of spontaneous EPSCs","journal":"Molecular brain","confidence":"High","confidence_rationale":"Tier 2 / Strong — subregion-specific conditional KOs dissecting pre- vs. postsynaptic roles with multiple orthogonal electrophysiological and behavioral readouts, single lab","pmids":["32264905"],"is_preprint":false},{"year":2020,"finding":"In C. elegans, the E3 ubiquitin ligase SEL-10/FBW7 binds a phosphodegron site on UNC-40/DCC and promotes its ubiquitin-mediated degradation at synapses of one sex (but not the other), thereby pruning sex-specific synaptic connections. An undegradable unc-40 gain-of-function allele retains synapses in both sexes, establishing that local protein degradation of UNC-40/DCC controls sexually dimorphic circuit connectivity.","method":"Genetic gain-of-function (undegradable unc-40 allele), co-immunoprecipitation (SEL-10/UNC-40), ubiquitination assays, synaptic connectivity imaging","journal":"Current biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP identifying E3 ligase-substrate interaction, gain-of-function allele establishing functional consequence, C. elegans ortholog study","pmids":["32857970"],"is_preprint":false}],"current_model":"DCC is a single-pass transmembrane netrin-1 receptor of the immunoglobulin superfamily that functions as a dependence receptor: in the absence of netrin-1 it induces apoptosis via a caspase-9/caspase-3 cascade (requiring lipid raft localization and cleavage at Asp1290), while netrin-1 binding suppresses apoptosis and activates downstream signaling cascades including Fyn/Src-mediated tyrosine phosphorylation of DCC (at Y1418), PLCγ1 activation, ERK2 docking and phosphorylation (via the P1 intracellular domain), and Cdc42/Rac1-driven actin remodeling for axon guidance and cell motility; DCC is also ubiquitinated by TRIM9 to restrain FAK activation, translocated from intracellular vesicle pools to the plasma membrane by PKA, forms a complex with translation initiation factors and ribosomes to mediate netrin-1-stimulated local protein synthesis, and its expression is posttranscriptionally regulated by miR-218 and miR-9."},"narrative":{"mechanistic_narrative":"DCC is a single-pass transmembrane immunoglobulin-superfamily receptor for netrin-1 that directs axon guidance, cell motility, and cell survival decisions in the nervous system and epithelium [PMID:8861902]. It functions as a dependence receptor: in the absence of netrin-1 it actively induces apoptosis, being cleaved by caspase-3 at Asp1290 and triggering a caspase-9-dependent, mitochondria- and death-receptor-independent caspase cascade through direct association with caspase-3 and caspase-9 and the adaptor DIP13α, a pro-apoptotic output that requires DCC localization to lipid rafts [PMID:9796814, PMID:11248093, PMID:12011067, PMID:16537496]. This dependence-receptor activity is physiologically protective — its genetic silencing drives spontaneous and APC-cooperative intestinal tumorigenesis, and loss of netrin-1 in the adult substantia nigra triggers DCC cleavage and dopamine-neuron death [PMID:22158121, PMID:33351190]. Netrin-1 binds the fifth fibronectin type III repeat of DCC with 1:1 stoichiometry, an interaction potentiated by cell-autonomous heparan sulfate, and switches DCC to a pro-outgrowth signaling mode [PMID:12810718, PMID:17442818]. Ligand engagement recruits the Src-family kinase Fyn, which phosphorylates DCC at Y1418, and assembles intracellular effector complexes including FAK and N-WASP that inhibit RhoA and activate Cdc42/Rac1 to remodel actin into filopodia and processes; netrin-1/DCC also activates PLCγ1 via Src and docks ERK2 at the P1 intracellular domain via a MAPK docking motif [PMID:11817894, PMID:15557120, PMID:19141671, PMID:21070949, PMID:30224412]. DCC additionally scaffolds eukaryotic initiation factors and ribosomal subunits to mediate netrin-1-stimulated local protein synthesis, and its surface availability is controlled by PKA-driven translocation from intracellular vesicles and by TRIM9-dependent ubiquitination that gates DCC-FAK coupling and exocytic axon branching [PMID:15044543, PMID:20434207, PMID:28701345]. In the adult forebrain and hippocampus DCC sustains Src-dependent NMDAR function, LTP, dendritic spine maintenance, and memory, with distinct pre- and postsynaptic contributions [PMID:23291093, PMID:32264905]. DCC abundance and isoform composition are tightly regulated post-transcriptionally by NOVA-dependent alternative splicing, by miR-218 and miR-9, and by ubiquitin-mediated degradation [PMID:27223328, PMID:27773352, PMID:30626732, PMID:32857970].","teleology":[{"year":1996,"claim":"Established the founding mechanistic identity of DCC by showing it is a functional netrin-1 receptor required for axon outgrowth, answering what ligand DCC transduces.","evidence":"Netrin-1 binding assay and anti-DCC antibody blocking of commissural axon outgrowth in vitro","pmids":["8861902"],"confidence":"High","gaps":["Did not define the binding domain","Did not address downstream signaling effectors"]},{"year":1998,"claim":"Revealed DCC as a dependence receptor that triggers apoptosis when unliganded, reframing it as an active cell-death effector rather than a passive guidance receptor.","evidence":"Cell-based apoptosis assays with caspase-3 cleavage-site (D1290) mutagenesis","pmids":["9796814"],"confidence":"High","gaps":["Did not identify which caspases execute the cascade","Did not establish the subcellular requirement for apoptosis"]},{"year":2001,"claim":"Defined the apoptotic execution route as a caspase-9/caspase-3 cascade independent of mitochondrial and death-receptor pathways, distinguishing DCC's death mechanism.","evidence":"Reciprocal co-IP of DCC with caspase-3/9 and pathway-inhibitor apoptosis assays","pmids":["11248093"],"confidence":"Medium","gaps":["Single lab","Did not map the caspase-interaction interface on DCC"]},{"year":2002,"claim":"Connected DCC to the actin machinery by showing netrin-1-dependent activation of Cdc42 and Rac1 drives filopodia and cell spreading, beginning the cytoskeletal effector map.","evidence":"Ectopic DCC expression with dominant-negative Cdc42/Rac1 and GTPase activation assays","pmids":["11817894"],"confidence":"Medium","gaps":["Did not link GTPase activation to a defined DCC intracellular motif","Single cell-line context"]},{"year":2002,"claim":"Identified DIP13α as an adaptor required for DCC-induced apoptosis, providing a molecular bridge for the dependence-receptor death output.","evidence":"Co-IP, domain-deletion mapping, siRNA knockdown with apoptosis readout","pmids":["12011067"],"confidence":"Medium","gaps":["Did not show DIP13α links DCC directly to caspases","Single lab"]},{"year":2003,"claim":"Localized the netrin-1 binding site to the FN5 repeat with 1:1 stoichiometry, defining the receptor-ligand interaction at domain resolution.","evidence":"Soluble netrin fragment pull-down, cross-linking, and stoichiometric analysis","pmids":["12810718"],"confidence":"High","gaps":["Did not provide atomic-resolution structure of the complex","Did not address receptor oligomerization on ligand binding"]},{"year":2004,"claim":"Showed PKA controls surface delivery of DCC from intracellular vesicles, establishing receptor availability as a regulated node tuning netrin-1 responsiveness.","evidence":"Surface biotinylation, imaging of DCC pools, and pharmacological inhibition of PKA/exocytosis in commissural neurons","pmids":["15044543"],"confidence":"High","gaps":["Did not identify the vesicular trafficking machinery","Mechanism linking PKA to DCC vesicles unresolved"]},{"year":2004,"claim":"Identified Fyn as the kinase phosphorylating DCC at Y1418 and required for netrin-1-driven outgrowth, defining the proximal tyrosine-kinase signaling step.","evidence":"In vitro Fyn/Src kinase assays, Y1418 mutagenesis, and Fyn-/- commissural neuron explants","pmids":["15557120"],"confidence":"High","gaps":["Did not connect Y1418 phosphorylation to specific downstream effectors","Did not address other DCC phosphosites"]},{"year":2006,"claim":"Demonstrated lipid-raft localization is required for DCC pro-apoptotic activity and caspase-9 recruitment, spatially compartmentalizing the death signal.","evidence":"Lipid raft fractionation, raft disruption, and caspase-9 co-IP with apoptosis assays","pmids":["16537496"],"confidence":"Medium","gaps":["Did not define raft-targeting sequence in DCC","Single lab"]},{"year":2006,"claim":"Linked DCC to the ERM/cortical actin system via ezrin/merlin binding through a juxtamembrane domain, extending the cytoskeletal interactome.","evidence":"In vitro pull-down, co-IP in COS-1, and adhesion/morphology assays","pmids":["16762451"],"confidence":"Medium","gaps":["Did not establish netrin-1 dependence of the ezrin interaction","Functional role in axon guidance not tested"]},{"year":2007,"claim":"Established heparan sulfate as a cell-autonomous co-requirement for netrin-1/DCC signaling, identifying a glycan cofactor for productive receptor output.","evidence":"Conditional Ext1 knockout, axon pathfinding, and DCC signaling readouts in HEK293T","pmids":["17442818"],"confidence":"High","gaps":["Did not resolve whether HS modifies DCC, netrin-1, or the complex geometry","Downstream signaling defect mechanism unspecified"]},{"year":2009,"claim":"Assembled the pro-outgrowth effector complex (Fyn/FAK/N-WASP) downstream of DCC and showed RhoA inhibition drives process remodeling, mechanistically opposing the dependence-receptor mode.","evidence":"Co-IP of Fyn/FAK/N-WASP with DCC, Fyn-/- oligodendrocytes, RhoA assays, branching assays","pmids":["19141671"],"confidence":"High","gaps":["Did not define stoichiometry or assembly order of the complex","Demonstrated in oligodendrocytes; generalization to axons inferred"]},{"year":2010,"claim":"Revealed DCC as a scaffold for translation initiation factors and ribosomes mediating netrin-1-stimulated local protein synthesis, expanding DCC function beyond signaling to translational control.","evidence":"Reciprocal co-IP with eIFs and ribosomal subunits, polysome profiling, in situ protein synthesis detection","pmids":["20434207"],"confidence":"High","gaps":["Did not identify mRNAs translated under DCC control","Did not map the DCC region binding translation machinery"]},{"year":2010,"claim":"Provided structural basis for ERK2 docking on the DCC P1 domain, defining a direct MAPK-receptor coupling in netrin signaling.","evidence":"X-ray crystal structure of ERK2-P1 complex, docking-motif mutagenesis, in vitro kinase assay","pmids":["21070949"],"confidence":"High","gaps":["Did not establish the downstream transcriptional/cytoskeletal output of ERK2-DCC","Cellular consequence of docking-motif mutation not tested in vivo"]},{"year":2011,"claim":"Placed DCC upstream of Src-dependent NMDAR function required for LTP and memory, extending its role to adult synaptic plasticity.","evidence":"Conditional neuronal DCC knockout, LTP electrophysiology, Src activity assays, NMDAR/Src rescue","pmids":["23291093"],"confidence":"High","gaps":["Did not establish whether DCC-Src signaling at synapses requires netrin-1","Molecular link from DCC to Src activation at synapses unresolved"]},{"year":2011,"claim":"Demonstrated in vivo that DCC's pro-apoptotic dependence activity is the basis of its tumor-suppressor function, causally linking the death mechanism to cancer.","evidence":"Mouse with genetically silenced DCC pro-apoptotic activity crossed to APC-mutant background, tumor monitoring","pmids":["22158121"],"confidence":"High","gaps":["Did not address whether netrin-1 levels modulate tumor outcome","Mechanism of apoptosis silencing in epithelium not detailed"]},{"year":2014,"claim":"Identified TRIM9-dependent ubiquitination as a switch gating DCC-FAK coupling and netrin-1-triggered exocytic axon branching, adding PTM control to receptor output.","evidence":"Co-IP, ubiquitination assays, FAK activity assay, exocytosis measurement, branching assays","pmids":["28701345"],"confidence":"High","gaps":["Did not map DCC ubiquitination sites","Did not connect ubiquitination state to the dependence-receptor death mode"]},{"year":2014,"claim":"Identified CBLN4 as a second extracellular DCC ligand competing with netrin-1 at the FN4-6 region, indicating ligand multiplicity at the netrin-binding interface.","evidence":"Extracellular protein microarray screen and radio-ligand competition binding","pmids":["24400119"],"confidence":"Medium","gaps":["Did not establish CBLN4-evoked DCC signaling output","Single lab"]},{"year":2016,"claim":"Showed NOVA-controlled alternative splicing of Dcc is required for correct DCC isoform production and guidance function, adding splicing as a post-transcriptional regulatory layer.","evidence":"In vivo RNAi, splicing analysis, and rescue by restoring Dcc splicing in Nova knockouts","pmids":["27223328"],"confidence":"Medium","gaps":["Did not define the functional difference between DCC splice isoforms","Single lab"]},{"year":2016,"claim":"Established miR-218 as a post-transcriptional repressor of DCC whose loss causes stress-vulnerability behavior, linking DCC dosage to affective phenotypes.","evidence":"miRNA-target reporter assay, expression analysis, viral Dcc overexpression in PFC with behavioral readout","pmids":["27773352"],"confidence":"Medium","gaps":["Did not define the DCC signaling output driving behavioral susceptibility","Single lab"]},{"year":2017,"claim":"Placed DCC under direct negative transcriptional control by Ctip2 in neocortical neurons governing callosal projection identity, adding transcriptional regulation to its dosage control.","evidence":"Genetic epistasis in Satb2/Ctip2 mutants, in situ hybridization, in utero electroporation","pmids":["24739528"],"confidence":"Medium","gaps":["Did not show direct Ctip2 binding to the Dcc locus","Single lab"]},{"year":2018,"claim":"Resolved a triangular Draxin/DCC/netrin-1 complex showing Draxin binds DCC Ig domains adjacent to the netrin site, defining how a third extracellular factor shapes netrin guidance.","evidence":"X-ray crystallography and SAXS of Draxin complexes with haptotaxis/fasciculation assays","pmids":["29503192"],"confidence":"High","gaps":["Did not establish intracellular signaling consequences of the ternary complex","Stoichiometry in cellular membranes not addressed"]},{"year":2018,"claim":"Placed PLCγ1 downstream of netrin-1/DCC via Src for actin rearrangement, extending the cytoskeletal effector pathway and tying it to white-matter development.","evidence":"Conditional Plcg1 knockout, PLCγ1 activation assay downstream of DCC, actin assays, brain histology","pmids":["30224412"],"confidence":"Medium","gaps":["Did not define how PLCγ1 output drives actin changes","Single lab"]},{"year":2019,"claim":"Identified miR-9 as a direct 3'UTR repressor of DCC controlling Schwann cell migration and DRG axon outgrowth, adding another miRNA tuning DCC abundance.","evidence":"3'UTR reporter assay, expression analysis, migration and axon outgrowth assays","pmids":["30626732"],"confidence":"Medium","gaps":["Did not address co-regulation with other DCC-targeting miRNAs","Single lab"]},{"year":2020,"claim":"Demonstrated that netrin-1 withdrawal triggers DCC cleavage and 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by regulating DCC receptor levels and local protein synthesis.","date":"2016","source":"Open biology","url":"https://pubmed.ncbi.nlm.nih.gov/27248654","citation_count":28,"is_preprint":false},{"pmid":"32857970","id":"PMC_32857970","title":"Synaptic Protein Degradation Controls Sexually Dimorphic Circuits through Regulation of DCC/UNC-40.","date":"2020","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/32857970","citation_count":28,"is_preprint":false},{"pmid":"10843775","id":"PMC_10843775","title":"The spatial and temporal expression patterns of netrin receptors, DCC and neogenin, in the developing mouse retina.","date":"2000","source":"Experimental eye research","url":"https://pubmed.ncbi.nlm.nih.gov/10843775","citation_count":27,"is_preprint":false},{"pmid":"20609112","id":"PMC_20609112","title":"Spatio-temporal deleted in colorectal cancer (DCC) and netrin-1 expression in human foetal brain development.","date":"2010","source":"Neuropathology and applied 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\"finding\": \"DCC (Deleted in Colorectal Cancer) encodes a netrin-1 receptor: DCC protein binds netrin-1, is expressed on spinal commissural axons, and an anti-DCC antibody selectively blocks netrin-1-dependent commissural axon outgrowth in vitro.\",\n      \"method\": \"Netrin-1 binding assay, antibody blocking of commissural axon outgrowth in vitro\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct ligand-binding assay combined with functional antibody blocking experiment, replicated across multiple organisms (C. elegans, Drosophila, vertebrate)\",\n      \"pmids\": [\"8861902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"DCC induces apoptosis in the absence of netrin-1 ligand (dependence receptor activity); netrin-1 engagement blocks apoptosis. DCC is a caspase-3 substrate cleaved at Asp1290, and mutation of this cleavage site abolishes DCC's pro-apoptotic effect.\",\n      \"method\": \"Cell-based apoptosis assays, site-directed mutagenesis of caspase-3 cleavage site (D1290), caspase substrate assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzymatic assay (caspase cleavage), active-site mutagenesis abolishing function, multiple orthogonal methods in one study\",\n      \"pmids\": [\"9796814\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"DCC drives caspase-3 activation through caspase-9 independently of the mitochondrial pathway (cytochrome c/Apaf-1-independent) and independently of the death receptor/caspase-8 pathway. DCC physically interacts with both caspase-3 and caspase-9.\",\n      \"method\": \"Co-immunoprecipitation of DCC with caspase-3 and caspase-9; cell-based apoptosis assays with pathway inhibitors\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP with caspase-3/9 and functional cell-based assays, single lab\",\n      \"pmids\": [\"11248093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"DCC promotes filopodia formation and cell spreading by activating Cdc42 and Rac1 in a netrin-1-dependent manner. Dominant-negative Cdc42 blocks netrin-1-induced filopodia increase, and dominant-negative Rac1 blocks cell surface area increase downstream of DCC.\",\n      \"method\": \"Ectopic DCC expression in HEK293T/NG108-15 cells, dominant-negative Cdc42/Rac1 co-expression, GTPase activation assays\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative epistasis combined with GTPase activation assays, single lab\",\n      \"pmids\": [\"11817894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"DIP13α (a protein with PH and PTB domains) interacts with the DCC cytoplasmic domain and mediates DCC-induced apoptosis; co-expression of DCC and DIP13α produces ~5-fold increase in apoptosis, and siRNA knockdown of DIP13α blocks DCC-induced apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, domain-deletion mutants, siRNA knockdown, cell-based apoptosis assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP identifying binding partner, siRNA loss-of-function with specific phenotypic readout, domain mapping, single lab\",\n      \"pmids\": [\"12011067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Netrin-1 binds exclusively to the fifth fibronectin type III (FN5) repeat of DCC with 1:1 stoichiometry. The loop on FN5 previously implicated in heparin binding is actually important for netrin binding; DCC-heparin interactions are mediated indirectly through netrin.\",\n      \"method\": \"Purified soluble netrin fragment pull-down assay, cross-linking experiments, stoichiometric analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstituted binding with defined domain mapping and mutagenesis-equivalent deletion analysis, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"12810718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PKA activation promotes translocation of DCC from an intracellular vesicular pool to the plasma membrane in embryonic spinal commissural neurons, selectively increasing cell-surface DCC and enhancing axon outgrowth in response to netrin-1. Inhibiting adenylate cyclase, PKA, or exocytosis blocks DCC translocation.\",\n      \"method\": \"Cell surface biotinylation, immunofluorescence of intracellular vs. plasma membrane DCC pools, pharmacological inhibition of PKA and exocytosis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiment (fractionation + imaging) tied to functional axon outgrowth consequence, multiple pharmacological interventions, single lab with orthogonal methods\",\n      \"pmids\": [\"15044543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Fyn (Src family kinase), but not Src, phosphorylates the DCC intracellular domain in vitro; DCC is phosphorylated on tyrosine in vivo upon netrin-1 stimulation. Y1418 is crucial for DCC axon outgrowth function. DCC phosphorylation and netrin-1-induced axon outgrowth are impaired in Fyn-/- neurons.\",\n      \"method\": \"In vitro kinase assay with Fyn/Src on DCC intracellular domain, site-directed mutagenesis (Y1418), Fyn-/- mouse commissural neuron explants\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay, mutagenesis of key phosphorylation site, genetic loss-of-function (Fyn KO) with defined phenotype\",\n      \"pmids\": [\"15557120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DCC localization to lipid rafts is required for its pro-apoptotic (dependence receptor) activity in both immortalized cells and primary neurons. Disruption of lipid rafts inhibits the interaction of caspase-9 with DCC.\",\n      \"method\": \"Lipid raft fractionation, pharmacological disruption of lipid rafts, co-immunoprecipitation of caspase-9 with DCC, cell-based apoptosis assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — subcellular fractionation linked to functional apoptosis readout, co-IP of caspase-9 with DCC, single lab\",\n      \"pmids\": [\"16537496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DCC associates with ezrin (and merlin) via a juxtamembrane ERM-binding domain; this interaction was demonstrated by in vitro pull-down of the DCC cytoplasmic domain with ezrin N-terminal region and confirmed by co-immunoprecipitation in COS-1 cells. DCC expression alters actin cytoskeleton organization and cell adhesion properties.\",\n      \"method\": \"In vitro pull-down assay, co-immunoprecipitation in transfected COS-1 cells, cell morphology and adhesion assays in DCC-transfected HT-29 cells\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro pull-down and co-IP identifying DCC-ezrin interaction, functional cell adhesion assay, single lab\",\n      \"pmids\": [\"16762451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Cell-autonomous expression of heparan sulfate (HS) by commissural neurons is required for netrin-1/DCC signaling. Ext1 ablation (eliminating HS synthesis) in dorsal spinal cord neurons causes commissural axon guidance defects similar to netrin-1/DCC loss-of-function. Intracellular signaling downstream of netrin-1/DCC is defective in Ext1-deficient neurons and in DCC-transfected cells from which HS was removed.\",\n      \"method\": \"Conditional Ext1 knockout (Wnt1-Cre), commissural axon pathfinding analysis, explant outgrowth assay, DCC signaling readouts in HEK293T cells\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional KO genetic epistasis, supported by in vitro cell-based signaling assays, multiple orthogonal approaches\",\n      \"pmids\": [\"17442818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Netrin-1 binding to Dcc on mature oligodendrocytes recruits Fyn to a complex with the Dcc intracellular domain that includes FAK and N-WASP, resulting in RhoA inhibition and promoting process remodeling. Fyn kinase (Src family) activity is required downstream of netrin-1-dependent process extension; Fyn-/- oligodendrocytes fail to branch in response to netrin-1.\",\n      \"method\": \"Co-immunoprecipitation of Fyn/FAK/N-WASP with Dcc intracellular domain, Fyn-/- mouse oligodendrocytes, RhoA activity assays, in vitro process branching assays\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP identifying multiprotein complex, Fyn KO functional validation, RhoA GTPase assay, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"19141671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DCC forms a binding complex with multiple translation components including eukaryotic initiation factors, ribosomal large and small subunits, and monosomes. Netrin-1 promotes DCC-mediated translation and causes dissociation of translation components from DCC. DCC colocalizes with translation machinery in neuronal axons and dendrites.\",\n      \"method\": \"Co-immunoprecipitation of DCC with translation initiation factors and ribosomal subunits, polysome profiling, in situ detection of newly synthesized protein, netrin-1 stimulation assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP identifying multiprotein translation complex, functional translation assay, subcellular localization, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"20434207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ERK2 (MAPK) directly interacts with the DCC intracellular P1 domain via a MAPK docking motif. Crystal structure of ERK2-P1 domain complex reveals physical positioning of DCC phosphorylation sites near the kinase active site. The docking interaction is essential for ERK2-mediated phosphorylation of DCC.\",\n      \"method\": \"Crystal structure (X-ray crystallography) of ERK2-DCC P1 complex, mutagenesis of docking motif, in vitro kinase phosphorylation assay\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with functional validation by mutagenesis and in vitro kinase assay, single lab\",\n      \"pmids\": [\"21070949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"DCC deletion from neurons in the adult forebrain results in loss of LTP, shorter dendritic spines, and impaired spatial/recognition memory. DCC deletion severely reduces Src activation; enhancing NMDAR function or activating Src rescues LTP in DCC-null neurons, placing DCC upstream of Src-dependent NMDAR activation required for LTP.\",\n      \"method\": \"Conditional neuron-specific DCC knockout, LTP electrophysiology, Src kinase activity assay, NMDAR function rescue experiments, dendritic spine morphology analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with multiple orthogonal readouts (LTP, spine morphology, Src activity, behavioral memory), rescue experiments establishing pathway position\",\n      \"pmids\": [\"23291093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Genetic silencing of DCC's pro-apoptotic activity in mice leads to spontaneous intestinal neoplasia and increases number and aggressiveness of intestinal tumors in APC-mutant background, demonstrating that DCC suppresses tumor progression via its dependence receptor (pro-apoptotic) activity.\",\n      \"method\": \"Transgenic mouse model with silenced DCC pro-apoptotic activity, tumor development monitoring, APC-mutant cross\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function mouse model with defined cellular mechanism (apoptosis) and tumor suppression phenotype, double-mutant epistasis\",\n      \"pmids\": [\"22158121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TRIM9-dependent ubiquitination of DCC blocks DCC interaction with FAK and prevents FAK phosphorylation. Upon netrin-1 stimulation, TRIM9 promotes DCC multimerization but reduces DCC ubiquitination, enabling FAK-DCC interaction and FAK activation, which then promotes exocytic vesicle fusion and axon branching.\",\n      \"method\": \"Co-immunoprecipitation of DCC-FAK, ubiquitination assays, FAK kinase activity assay, exocytosis frequency measurement, in vitro and in vivo axon branching assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — PTM (ubiquitination) identified with writer (TRIM9), functional consequences on DCC-FAK interaction and downstream signaling established with multiple orthogonal methods\",\n      \"pmids\": [\"28701345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cerebellin-4 (CBLN4) is a bona fide extracellular ligand of DCC, binding within the membrane-proximal fibronectin type III domains (FN4-6) of DCC, overlapping with the netrin-1 binding site. Netrin-1 competes with CBLN4 for DCC binding with ~5-fold higher affinity. CBLN4 also binds neogenin-1 with lower affinity than DCC.\",\n      \"method\": \"Extracellular protein microarray interaction screen, immunofluorescence, radio-ligand binding competition assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — protein microarray plus radio-ligand competition assay identifying new DCC ligand and binding site, single lab\",\n      \"pmids\": [\"24400119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NOVA RNA-binding proteins regulate alternative splicing of Dcc mRNA; Nova deficiency disrupts DCC splice variant production. Restoring correct Dcc splicing in Nova knockouts rescues commissural neuron migration, axon outgrowth, and axon guidance defects.\",\n      \"method\": \"In vivo RNAi screen in dorsal spinal cord, splicing analysis, rescue by restoring Dcc splicing in Nova knockout\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with rescue experiment establishing post-transcriptional regulation of DCC by NOVA splicing, single lab\",\n      \"pmids\": [\"27223328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"miR-218 acts as a posttranscriptional repressor of DCC in prefrontal cortex pyramidal neurons. Exaggerated DCC expression (with reduced miR-218) in PFC leads to vulnerability to stress-induced social avoidance and anhedonia. Upregulation of Dcc in PFC pyramidal neurons causes susceptibility to depression-like behaviors.\",\n      \"method\": \"miRNA-target reporter assay, in vitro and in vivo miR-218/DCC expression analysis, viral-mediated Dcc overexpression in mouse PFC with behavioral readout\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — miRNA-target validation combined with viral OE and behavioral phenotype, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"27773352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Unc5C and DCC expression are under direct negative transcriptional regulation by Satb2 and Ctip2 respectively in neocortical neurons. Netrin1-Unc5C/DCC interaction controls interhemispheric (callosal) projections in deep-layer neurons.\",\n      \"method\": \"Genetic epistasis (Satb2 and Ctip2 mutant mice), in situ hybridization, in utero electroporation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis placing DCC downstream of Ctip2 in axon guidance, single lab\",\n      \"pmids\": [\"24739528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal/solution structures of Draxin/DCC and Draxin/Netrin-1 complexes reveal: Draxin interacts with DCC through N-terminal four immunoglobulin domains, and with Netrin-1 through its EGF-3 domain. Netrin-1 and DCC bind adjacent sites on Draxin, forming a triangular complex. This arrangement affects Netrin-mediated haptotaxis and axon fasciculation.\",\n      \"method\": \"X-ray crystallography and SAXS solution structures of Draxin/DCC and Draxin/Netrin-1 complexes, functional haptotaxis and fasciculation assays\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with functional validation (haptotaxis and fasciculation assays), single lab with structural and functional orthogonal methods\",\n      \"pmids\": [\"29503192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Netrin-1/DCC activates PLCγ1 through Src kinase to induce actin cytoskeleton rearrangement. Neuronal progenitor-specific knockout of Plcg1 causes axon guidance defects and white matter structural alterations, placing PLCγ1 downstream of netrin-1/DCC signaling.\",\n      \"method\": \"Conditional Plcg1 knockout in neuronal progenitors, PLCγ1 activation assay downstream of DCC, actin rearrangement assays, brain structural MRI/histology\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO epistasis placing PLCγ1 downstream of DCC/Src, with in vitro signaling and in vivo structural phenotypes, single lab\",\n      \"pmids\": [\"30224412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"miR-9 directly targets Dcc mRNA via its 3′-UTR, represses DCC expression, and suppresses Schwann cell migration. let-7 targets Netrin-1. miR-9-mediated downregulation of DCC reduces axon outgrowth in dorsal root ganglion neurons.\",\n      \"method\": \"qRT-PCR, reporter gene (3′-UTR) assay, biochemical expression analysis, Schwann cell migration assay, DRG axon outgrowth assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — 3′-UTR reporter assay validating miR-9 as DCC repressor, combined with functional migration/axon outgrowth assays, single lab\",\n      \"pmids\": [\"30626732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Silencing netrin-1 in the adult mouse substantia nigra induces DCC cleavage and significant loss of dopamine neurons, producing motor deficits. Overexpression or brain administration of recombinant netrin-1 is neuroprotective and neurorestorative in mouse/rat PD models, demonstrating that netrin-1/DCC signaling governs adult dopamine neuron survival.\",\n      \"method\": \"AAV-mediated netrin-1 silencing in substantia nigra, DCC cleavage Western blot, dopamine neuron stereological counting, behavioral motor assays, pharmacological netrin-1 administration in PD models\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function (silencing) and gain-of-function (OE/recombinant protein) both confirm mechanism, multiple animal models, DCC cleavage as molecular readout\",\n      \"pmids\": [\"33351190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Pre- and postsynaptic DCC contribute distinctly to hippocampal synaptic plasticity: DCC loss from CA1 postsynaptic neurons impairs spatial memory, alters dendritic spine morphology, and reduces postsynaptic adaptor/signaling proteins (but LTP remains intact), while DCC loss from CA3 presynaptic neurons impairs LTP at Schaffer collateral synapses and novel object recognition without altering CA1 intrinsic properties.\",\n      \"method\": \"Hippocampal subregion-specific conditional DCC deletion, LTP electrophysiology, dendritic spine morphology, behavioral memory tasks, electrophysiological recording of spontaneous EPSCs\",\n      \"journal\": \"Molecular brain\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — subregion-specific conditional KOs dissecting pre- vs. postsynaptic roles with multiple orthogonal electrophysiological and behavioral readouts, single lab\",\n      \"pmids\": [\"32264905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In C. elegans, the E3 ubiquitin ligase SEL-10/FBW7 binds a phosphodegron site on UNC-40/DCC and promotes its ubiquitin-mediated degradation at synapses of one sex (but not the other), thereby pruning sex-specific synaptic connections. An undegradable unc-40 gain-of-function allele retains synapses in both sexes, establishing that local protein degradation of UNC-40/DCC controls sexually dimorphic circuit connectivity.\",\n      \"method\": \"Genetic gain-of-function (undegradable unc-40 allele), co-immunoprecipitation (SEL-10/UNC-40), ubiquitination assays, synaptic connectivity imaging\",\n      \"journal\": \"Current biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP identifying E3 ligase-substrate interaction, gain-of-function allele establishing functional consequence, C. elegans ortholog study\",\n      \"pmids\": [\"32857970\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DCC is a single-pass transmembrane netrin-1 receptor of the immunoglobulin superfamily that functions as a dependence receptor: in the absence of netrin-1 it induces apoptosis via a caspase-9/caspase-3 cascade (requiring lipid raft localization and cleavage at Asp1290), while netrin-1 binding suppresses apoptosis and activates downstream signaling cascades including Fyn/Src-mediated tyrosine phosphorylation of DCC (at Y1418), PLCγ1 activation, ERK2 docking and phosphorylation (via the P1 intracellular domain), and Cdc42/Rac1-driven actin remodeling for axon guidance and cell motility; DCC is also ubiquitinated by TRIM9 to restrain FAK activation, translocated from intracellular vesicle pools to the plasma membrane by PKA, forms a complex with translation initiation factors and ribosomes to mediate netrin-1-stimulated local protein synthesis, and its expression is posttranscriptionally regulated by miR-218 and miR-9.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DCC is a single-pass transmembrane immunoglobulin-superfamily receptor for netrin-1 that directs axon guidance, cell motility, and cell survival decisions in the nervous system and epithelium [#0]. It functions as a dependence receptor: in the absence of netrin-1 it actively induces apoptosis, being cleaved by caspase-3 at Asp1290 and triggering a caspase-9-dependent, mitochondria- and death-receptor-independent caspase cascade through direct association with caspase-3 and caspase-9 and the adaptor DIP13\\u03b1, a pro-apoptotic output that requires DCC localization to lipid rafts [#1, #2, #4, #8]. This dependence-receptor activity is physiologically protective \\u2014 its genetic silencing drives spontaneous and APC-cooperative intestinal tumorigenesis, and loss of netrin-1 in the adult substantia nigra triggers DCC cleavage and dopamine-neuron death [#15, #24]. Netrin-1 binds the fifth fibronectin type III repeat of DCC with 1:1 stoichiometry, an interaction potentiated by cell-autonomous heparan sulfate, and switches DCC to a pro-outgrowth signaling mode [#5, #10]. Ligand engagement recruits the Src-family kinase Fyn, which phosphorylates DCC at Y1418, and assembles intracellular effector complexes including FAK and N-WASP that inhibit RhoA and activate Cdc42/Rac1 to remodel actin into filopodia and processes; netrin-1/DCC also activates PLC\\u03b31 via Src and docks ERK2 at the P1 intracellular domain via a MAPK docking motif [#3, #7, #11, #13, #22]. DCC additionally scaffolds eukaryotic initiation factors and ribosomal subunits to mediate netrin-1-stimulated local protein synthesis, and its surface availability is controlled by PKA-driven translocation from intracellular vesicles and by TRIM9-dependent ubiquitination that gates DCC-FAK coupling and exocytic axon branching [#6, #12, #16]. In the adult forebrain and hippocampus DCC sustains Src-dependent NMDAR function, LTP, dendritic spine maintenance, and memory, with distinct pre- and postsynaptic contributions [#14, #25]. DCC abundance and isoform composition are tightly regulated post-transcriptionally by NOVA-dependent alternative splicing, by miR-218 and miR-9, and by ubiquitin-mediated degradation [#18, #19, #23, #26].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established the founding mechanistic identity of DCC by showing it is a functional netrin-1 receptor required for axon outgrowth, answering what ligand DCC transduces.\",\n      \"evidence\": \"Netrin-1 binding assay and anti-DCC antibody blocking of commissural axon outgrowth in vitro\",\n      \"pmids\": [\"8861902\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the binding domain\", \"Did not address downstream signaling effectors\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Revealed DCC as a dependence receptor that triggers apoptosis when unliganded, reframing it as an active cell-death effector rather than a passive guidance receptor.\",\n      \"evidence\": \"Cell-based apoptosis assays with caspase-3 cleavage-site (D1290) mutagenesis\",\n      \"pmids\": [\"9796814\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify which caspases execute the cascade\", \"Did not establish the subcellular requirement for apoptosis\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined the apoptotic execution route as a caspase-9/caspase-3 cascade independent of mitochondrial and death-receptor pathways, distinguishing DCC's death mechanism.\",\n      \"evidence\": \"Reciprocal co-IP of DCC with caspase-3/9 and pathway-inhibitor apoptosis assays\",\n      \"pmids\": [\"11248093\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Did not map the caspase-interaction interface on DCC\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Connected DCC to the actin machinery by showing netrin-1-dependent activation of Cdc42 and Rac1 drives filopodia and cell spreading, beginning the cytoskeletal effector map.\",\n      \"evidence\": \"Ectopic DCC expression with dominant-negative Cdc42/Rac1 and GTPase activation assays\",\n      \"pmids\": [\"11817894\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not link GTPase activation to a defined DCC intracellular motif\", \"Single cell-line context\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified DIP13\\u03b1 as an adaptor required for DCC-induced apoptosis, providing a molecular bridge for the dependence-receptor death output.\",\n      \"evidence\": \"Co-IP, domain-deletion mapping, siRNA knockdown with apoptosis readout\",\n      \"pmids\": [\"12011067\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not show DIP13\\u03b1 links DCC directly to caspases\", \"Single lab\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Localized the netrin-1 binding site to the FN5 repeat with 1:1 stoichiometry, defining the receptor-ligand interaction at domain resolution.\",\n      \"evidence\": \"Soluble netrin fragment pull-down, cross-linking, and stoichiometric analysis\",\n      \"pmids\": [\"12810718\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not provide atomic-resolution structure of the complex\", \"Did not address receptor oligomerization on ligand binding\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed PKA controls surface delivery of DCC from intracellular vesicles, establishing receptor availability as a regulated node tuning netrin-1 responsiveness.\",\n      \"evidence\": \"Surface biotinylation, imaging of DCC pools, and pharmacological inhibition of PKA/exocytosis in commissural neurons\",\n      \"pmids\": [\"15044543\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the vesicular trafficking machinery\", \"Mechanism linking PKA to DCC vesicles unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified Fyn as the kinase phosphorylating DCC at Y1418 and required for netrin-1-driven outgrowth, defining the proximal tyrosine-kinase signaling step.\",\n      \"evidence\": \"In vitro Fyn/Src kinase assays, Y1418 mutagenesis, and Fyn-/- commissural neuron explants\",\n      \"pmids\": [\"15557120\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not connect Y1418 phosphorylation to specific downstream effectors\", \"Did not address other DCC phosphosites\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrated lipid-raft localization is required for DCC pro-apoptotic activity and caspase-9 recruitment, spatially compartmentalizing the death signal.\",\n      \"evidence\": \"Lipid raft fractionation, raft disruption, and caspase-9 co-IP with apoptosis assays\",\n      \"pmids\": [\"16537496\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not define raft-targeting sequence in DCC\", \"Single lab\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Linked DCC to the ERM/cortical actin system via ezrin/merlin binding through a juxtamembrane domain, extending the cytoskeletal interactome.\",\n      \"evidence\": \"In vitro pull-down, co-IP in COS-1, and adhesion/morphology assays\",\n      \"pmids\": [\"16762451\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not establish netrin-1 dependence of the ezrin interaction\", \"Functional role in axon guidance not tested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Established heparan sulfate as a cell-autonomous co-requirement for netrin-1/DCC signaling, identifying a glycan cofactor for productive receptor output.\",\n      \"evidence\": \"Conditional Ext1 knockout, axon pathfinding, and DCC signaling readouts in HEK293T\",\n      \"pmids\": [\"17442818\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve whether HS modifies DCC, netrin-1, or the complex geometry\", \"Downstream signaling defect mechanism unspecified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Assembled the pro-outgrowth effector complex (Fyn/FAK/N-WASP) downstream of DCC and showed RhoA inhibition drives process remodeling, mechanistically opposing the dependence-receptor mode.\",\n      \"evidence\": \"Co-IP of Fyn/FAK/N-WASP with DCC, Fyn-/- oligodendrocytes, RhoA assays, branching assays\",\n      \"pmids\": [\"19141671\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define stoichiometry or assembly order of the complex\", \"Demonstrated in oligodendrocytes; generalization to axons inferred\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Revealed DCC as a scaffold for translation initiation factors and ribosomes mediating netrin-1-stimulated local protein synthesis, expanding DCC function beyond signaling to translational control.\",\n      \"evidence\": \"Reciprocal co-IP with eIFs and ribosomal subunits, polysome profiling, in situ protein synthesis detection\",\n      \"pmids\": [\"20434207\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify mRNAs translated under DCC control\", \"Did not map the DCC region binding translation machinery\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Provided structural basis for ERK2 docking on the DCC P1 domain, defining a direct MAPK-receptor coupling in netrin signaling.\",\n      \"evidence\": \"X-ray crystal structure of ERK2-P1 complex, docking-motif mutagenesis, in vitro kinase assay\",\n      \"pmids\": [\"21070949\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish the downstream transcriptional/cytoskeletal output of ERK2-DCC\", \"Cellular consequence of docking-motif mutation not tested in vivo\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Placed DCC upstream of Src-dependent NMDAR function required for LTP and memory, extending its role to adult synaptic plasticity.\",\n      \"evidence\": \"Conditional neuronal DCC knockout, LTP electrophysiology, Src activity assays, NMDAR/Src rescue\",\n      \"pmids\": [\"23291093\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish whether DCC-Src signaling at synapses requires netrin-1\", \"Molecular link from DCC to Src activation at synapses unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated in vivo that DCC's pro-apoptotic dependence activity is the basis of its tumor-suppressor function, causally linking the death mechanism to cancer.\",\n      \"evidence\": \"Mouse with genetically silenced DCC pro-apoptotic activity crossed to APC-mutant background, tumor monitoring\",\n      \"pmids\": [\"22158121\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address whether netrin-1 levels modulate tumor outcome\", \"Mechanism of apoptosis silencing in epithelium not detailed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified TRIM9-dependent ubiquitination as a switch gating DCC-FAK coupling and netrin-1-triggered exocytic axon branching, adding PTM control to receptor output.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, FAK activity assay, exocytosis measurement, branching assays\",\n      \"pmids\": [\"28701345\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not map DCC ubiquitination sites\", \"Did not connect ubiquitination state to the dependence-receptor death mode\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified CBLN4 as a second extracellular DCC ligand competing with netrin-1 at the FN4-6 region, indicating ligand multiplicity at the netrin-binding interface.\",\n      \"evidence\": \"Extracellular protein microarray screen and radio-ligand competition binding\",\n      \"pmids\": [\"24400119\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not establish CBLN4-evoked DCC signaling output\", \"Single lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed NOVA-controlled alternative splicing of Dcc is required for correct DCC isoform production and guidance function, adding splicing as a post-transcriptional regulatory layer.\",\n      \"evidence\": \"In vivo RNAi, splicing analysis, and rescue by restoring Dcc splicing in Nova knockouts\",\n      \"pmids\": [\"27223328\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not define the functional difference between DCC splice isoforms\", \"Single lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established miR-218 as a post-transcriptional repressor of DCC whose loss causes stress-vulnerability behavior, linking DCC dosage to affective phenotypes.\",\n      \"evidence\": \"miRNA-target reporter assay, expression analysis, viral Dcc overexpression in PFC with behavioral readout\",\n      \"pmids\": [\"27773352\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not define the DCC signaling output driving behavioral susceptibility\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Placed DCC under direct negative transcriptional control by Ctip2 in neocortical neurons governing callosal projection identity, adding transcriptional regulation to its dosage control.\",\n      \"evidence\": \"Genetic epistasis in Satb2/Ctip2 mutants, in situ hybridization, in utero electroporation\",\n      \"pmids\": [\"24739528\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not show direct Ctip2 binding to the Dcc locus\", \"Single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved a triangular Draxin/DCC/netrin-1 complex showing Draxin binds DCC Ig domains adjacent to the netrin site, defining how a third extracellular factor shapes netrin guidance.\",\n      \"evidence\": \"X-ray crystallography and SAXS of Draxin complexes with haptotaxis/fasciculation assays\",\n      \"pmids\": [\"29503192\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish intracellular signaling consequences of the ternary complex\", \"Stoichiometry in cellular membranes not addressed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Placed PLC\\u03b31 downstream of netrin-1/DCC via Src for actin rearrangement, extending the cytoskeletal effector pathway and tying it to white-matter development.\",\n      \"evidence\": \"Conditional Plcg1 knockout, PLC\\u03b31 activation assay downstream of DCC, actin assays, brain histology\",\n      \"pmids\": [\"30224412\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not define how PLC\\u03b31 output drives actin changes\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified miR-9 as a direct 3'UTR repressor of DCC controlling Schwann cell migration and DRG axon outgrowth, adding another miRNA tuning DCC abundance.\",\n      \"evidence\": \"3'UTR reporter assay, expression analysis, migration and axon outgrowth assays\",\n      \"pmids\": [\"30626732\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not address co-regulation with other DCC-targeting miRNAs\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated that netrin-1 withdrawal triggers DCC cleavage and dopamine-neuron loss in the adult substantia nigra, establishing DCC dependence-receptor signaling as a determinant of adult neuron survival relevant to Parkinsonian models.\",\n      \"evidence\": \"AAV netrin-1 silencing, DCC cleavage Western blot, dopamine-neuron counting, behavior, and recombinant netrin-1 rescue\",\n      \"pmids\": [\"33351190\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not dissect the caspase cascade in dopamine neurons in vivo\", \"Did not address whether DIP13\\u03b1/raft requirements apply here\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Dissected distinct pre- versus postsynaptic DCC contributions to hippocampal plasticity and memory, refining its synaptic role at circuit resolution.\",\n      \"evidence\": \"Subregion-specific conditional DCC knockouts, LTP electrophysiology, spine morphology, memory tasks, EPSC recordings\",\n      \"pmids\": [\"32264905\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the molecular effectors differing between pre- and postsynaptic compartments\", \"Ligand dependence of synaptic DCC roles not resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed SEL-10/FBW7-mediated ubiquitin-dependent degradation of UNC-40/DCC prunes sex-specific synapses, establishing regulated DCC turnover as a determinant of circuit connectivity.\",\n      \"evidence\": \"Undegradable unc-40 gain-of-function allele, SEL-10/UNC-40 co-IP, ubiquitination assays, synaptic imaging in C. elegans\",\n      \"pmids\": [\"32857970\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Conservation of the SEL-10/FBW7 phosphodegron in mammalian DCC not tested\", \"C. elegans ortholog study\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the dependence-receptor death mode and the netrin-1 pro-outgrowth/survival mode are molecularly switched at the level of a single DCC molecule \\u2014 integrating ligand occupancy, raft localization, ubiquitination, phosphorylation, and oligomerization \\u2014 remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No unified structural model coupling ligand state to caspase recruitment versus effector assembly\", \"Whether CBLN4 and Draxin modulate the apoptotic versus signaling switch is unknown\", \"DCC ubiquitination sites and their interplay with phosphorylation are uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 5, 17, 21]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 11, 13]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [6, 8]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [6, 16]},\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 7, 11, 21]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [1, 2, 15, 24]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 7, 13, 22]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [14, 25]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [12, 16]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"NTN1\", \"FYN\", \"CASP3\", \"CASP9\", \"FAK\", \"WASL\", \"MAPK1\", \"EZR\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}