{"gene":"CNTN1","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":1989,"finding":"Mouse F3 (CNTN1) is a GPI-anchored member of the immunoglobulin superfamily with six C2-type Ig-like domains and fibronectin type III repeats, anchored to the membrane via a phosphatidylinositol anchor (no transmembrane domain), and is distributed between buffer-soluble, nonionic detergent-soluble, and detergent-insoluble fractions in brain. It is expressed on the neuronal cell surface, most prominently on neurites, and its gene transcripts are developmentally regulated with highest expression between 1–2 weeks after birth.","method":"cDNA cloning, sequence analysis, immunoblotting, immunocytochemistry, subcellular fractionation","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 — original structural characterization with multiple orthogonal methods; foundational paper with 258 citations","pmids":["2474555"],"is_preprint":false},{"year":1993,"finding":"F3/11 (CNTN1) mediates neuronal repulsion by the extracellular matrix glycoprotein J1-160/180 (tenascin): F3 on the neuronal surface recognizes J1-160/180 substrate, and this interaction induces loss of substrate adhesion and inhibition of neurite outgrowth. Antibody blocking of F3 prevents the avoidance response at J1-160/180 substrate borders, establishing F3 as the receptor mediating repellent signaling.","method":"Cell adhesion assays with F3-transfected CHO cells, cerebellar neuron culture on J1-160/180 substrates, antibody blocking experiments","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 — reciprocal functional assays with transfected cells and primary neurons, antibody blocking; 232 citations","pmids":["7678967"],"is_preprint":false},{"year":1994,"finding":"Human contactin (CNTN1) encodes a GPI-anchored protein (confirmed by PI-PLC treatment and [3H]-ethanolamine metabolic labeling) with six C2 Ig-domains and four FNIII repeats, 94% identical to mouse F3 and 78% identical to chick contactin/F11. The CNTN1 gene maps to human chromosome 12q11-q12.","method":"cDNA cloning, PI-PLC treatment of transfected cells, metabolic labeling with [3H]-ethanolamine, fluorescence in situ hybridization","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 1 — direct biochemical demonstration of GPI anchor with multiple methods","pmids":["7959734"],"is_preprint":false},{"year":1995,"finding":"CNTN1 (F3) is localized to glycolipid-enriched membrane microdomains (lipid rafts) resistant to Triton X-100 solubilization in adult mouse cerebellum, and is physically associated in a complex with both the L1 transmembrane adhesion molecule and the fyn tyrosine kinase within these microdomains, as shown by co-immunoprecipitation.","method":"Detergent-resistant membrane fractionation, lipid composition analysis, co-immunoprecipitation from cerebellum extracts","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 2 — co-IP from native brain tissue plus biochemical fractionation; 135 citations","pmids":["7595520"],"is_preprint":false},{"year":1995,"finding":"The carbonic anhydrase (CAH) domain of receptor-type protein tyrosine phosphatase beta (RPTPbeta) binds specifically to contactin (CNTN1), a GPI-anchored neuronal recognition molecule, as identified by expression cloning. This interaction mediates cell adhesion and neurite growth of primary tectal neurons, and these responses are blocked by anti-contactin antibodies, establishing contactin as a functional neuronal receptor for RPTPbeta.","method":"Expression cloning in COS7 cells, fusion protein binding assays, neurite outgrowth assays with primary tectal neurons, antibody blocking","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — expression cloning, functional validation with primary neurons, antibody blocking; 359 citations","pmids":["7628014"],"is_preprint":false},{"year":1996,"finding":"F3 (CNTN1) transduces signals across the membrane despite being GPI-anchored: F3-mediated cell aggregation induces tyrosine phosphorylation in F3-transfected CHO cells. F3 forms non-covalent complexes with protein tyrosine kinase(s), identified as fyn kinase in postnatal cerebellum. The FNIII repeats of F3 are essential for kinase association and for modulation of tyrosine phosphorylation, as a truncated F3 lacking all FNIII repeats fails to associate with a kinase or modulate phosphorylation.","method":"32P metabolic labeling, immunoprecipitation, antibody-mediated cross-linking, co-IP with fyn from cerebellum, truncation mutant analysis in CHO cells","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1–2 — domain mutagenesis, co-IP from native tissue, functional readout; 23 citations","pmids":["8907714"],"is_preprint":false},{"year":1997,"finding":"F3/contactin (CNTN1) is expressed not only by neurons but also by oligodendrocyte-lineage cells, including oligodendrocyte precursors and mature oligodendrocytes, and is present in myelin. Oligodendroglial F3 is GPI-anchored (sensitive to PI-PLC) and the same size mRNA as neuronal F3; F3 is absent from astrocytes.","method":"Biosynthetic labeling, 2D gel electrophoresis, microsequencing, Western blotting, immunoprecipitation, double immunofluorescence, Northern blots, PI-PLC cleavage","journal":"Glia","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods confirming oligodendroglial expression and GPI anchoring","pmids":["9063727"],"is_preprint":false},{"year":1997,"finding":"RPTPbeta extracellular regions induce neurite outgrowth via both contactin (CNTN1) and Nr-CAM: the betaCFS fusion protein promotes neurite outgrowth that is inhibited by antibodies against both Nr-CAM and contactin. Contactin and Nr-CAM form a complex that co-immunoprecipitates with betaCFS, indicating a ternary complex.","method":"Recombinant Fc fusion proteins as substrates, neurite outgrowth assays with primary neurons, antibody inhibition, co-immunoprecipitation","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — functional neurite outgrowth assays, antibody blocking, co-IP; 153 citations","pmids":["9049255"],"is_preprint":false},{"year":1998,"finding":"F3 and TAG-1 interact functionally on cerebellar granule cell neurites: F3 transfectants inhibit neurite outgrowth and induce fasciculation of granule cells, whereas co-expression of TAG-1 with F3 blocks this inhibitory effect. F3 co-immunoprecipitates with TAG-1 from Triton X-100-insoluble microdomains from newborn brain, and co-clustering of F3 and TAG-1 occurs in double-transfected CHO cells, indicating they associate in a multimolecular complex in lipid rafts to modulate axonal growth.","method":"CHO cell transfection co-culture assay with granule cells, microsphere binding, antibody-mediated cross-linking, co-immunoprecipitation from brain","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — functional assay, co-IP from brain, co-clustering in transfected cells; 60 citations","pmids":["9712656"],"is_preprint":false},{"year":1998,"finding":"Tenascin-R (TN-R) and its neuronal receptor F3 (CNTN1) promote neurite defasciculation in cerebellar explant cultures. Perturbation of this interaction by antibodies or antisense oligonucleotides increases fasciculation. The relevant domains are the N-terminal region of TN-R (containing cysteine-rich stretch and EGF-like repeats) and the Ig-like domains of F3. Defasciculation can be blocked by a protein kinase C inhibitor and reversed by a phorbol ester, implicating PKC signaling downstream.","method":"Cerebellar explant cultures, antibody and antisense oligonucleotide perturbation, domain mapping with recombinant proteins, pharmacological inhibition of PKC","journal":"Journal of neuroscience research","confidence":"High","confidence_rationale":"Tier 2 — functional explant assay, antibody and antisense perturbation, domain identification, pharmacological pathway dissection; 50 citations","pmids":["9589384"],"is_preprint":false},{"year":1998,"finding":"F3/contactin (CNTN1) is localized in secretory granules in all compartments of oxytocin/vasopressin (HNS) neurons and is co-released by exocytosis at axon terminals in the neurohypophysis upon physiological stimulation (lactation, osmotic challenge). Surface expression is upregulated by stimulation and is restricted to axons; F3 mRNA increases more than threefold upon stimulation, following a regulated secretory pathway.","method":"Immunocytochemistry, immunoblot, in situ hybridization, confocal/electron microscopy, sucrose density gradient fractionation","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — multiple imaging and biochemical methods establishing regulated secretory localization","pmids":["9651216"],"is_preprint":false},{"year":1999,"finding":"NrCAM is identified as the functional receptor on cerebellar granule cell growth cones that mediates the inhibitory effect of F3 (CNTN1) on axonal elongation: F3Fc-conjugated microspheres bind to growth cones via heterophilic interaction with NrCAM but not L1. Time-lapse video microscopy shows F3Fc beads move retrogradely from the leading edge to the base of the growth cone at ~5.7 µm/min, consistent with coupling to retrograde actin flow; cytochalasin B disrupts this movement. Retrograde mobility requires NrCAM clustering.","method":"Microsphere binding assay, time-lapse video microscopy, cytochalasin B pharmacology, cross-linked vs. dimeric F3Fc chimera comparison","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — live imaging, pharmacological dissection, functional receptor identification; 40 citations","pmids":["10462518"],"is_preprint":false},{"year":1999,"finding":"F3 (CNTN1) Ig domains interact with Caspr/paranodin (a transmembrane neurexin superfamily protein), and this association is required for surface transport of Caspr. Co-transfection of F3 with Caspr in CHO or neuroblastoma cells results in plasma membrane delivery of Caspr (not achieved by Caspr alone). F3's GPI anchor and FNIII repeats cooperate to recruit Caspr into Triton X-100-insoluble lipid raft microdomains, enabling its plasma membrane targeting; a truncated F3 lacking FNIII repeats fails to recruit Caspr to rafts or the cell surface.","method":"Co-transfection in CHO/neuroblastoma cells, confocal microscopy, cell surface biotinylation, co-immunoprecipitation domain mapping, Triton X-100 fractionation","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, domain mapping, functional consequence of association; 111 citations","pmids":["10769038"],"is_preprint":false},{"year":1999,"finding":"F3/contactin (CNTN1) participates in bidirectional neuron-glia signaling: F3 Ig domains bind tenascin-R, tenascin-C, and isoforms of the proteoglycan-type protein tyrosine phosphatase RPTPz/beta expressed by glia. Preclustered F3IgFc specifically modifies distribution and intensity of phosphotyrosine labeling in glial C6 cells. Inhibition of tenascin-R/F3 interaction prevents defasciculation of cerebellar explants. F3IgFc binds strongly to astrocytes and C6 astrocytoma cells.","method":"F3IgFc chimera binding to primary cultures and astrocytoma cells, fluorosphere binding, brain extract pull-down, cerebellar explant cultures, phosphotyrosine immunostaining","journal":"Advances in experimental medicine and biology","confidence":"Medium","confidence_rationale":"Tier 2 — functional assays and binding studies, but review/proceedings format limits primary data assessment","pmids":["10635039"],"is_preprint":false},{"year":2001,"finding":"F3/contactin (CNTN1) surface expression in hypothalamic oxytocin neurons is polarized to axons and is mobilized to the axonal surface via the activity-dependent regulated secretory pathway. Re-expression after GPI-PLC removal is accelerated by K+ depolarization or bicuculline (GABA-A blockade) and inhibited by Mn2+ (Ca2+ channel block), tetrodotoxin (Na+ channel block), or glutamate antagonists, demonstrating that externalization depends on Ca2+ entry and electrical activity.","method":"GPI-PLC treatment of live organotypic slice cultures, immunocytochemistry of live vs. fixed cells, K+ depolarization, pharmacological inhibition","journal":"The European journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — direct live-cell imaging and pharmacological dissection of activity-dependent surface mobilization","pmids":["11556889"],"is_preprint":false},{"year":2001,"finding":"Contactin (CNTN1) associates with voltage-gated Na+ channel Nav1.2 alpha subunits and the beta1 subunit in brain. Co-transfection of contactin with Nav1.2alpha and beta1 in cells increases peak Na+ currents 3–4 fold and increases Na+ channel surface membrane density (confirmed by saxitoxin binding). Contactin interacts specifically with the beta1 subunit (not beta2) by co-immunoprecipitation from cell lines. In the CNS, contactin and Na+ channels colocalize at nodes of Ranvier during development and in adults.","method":"Co-immunoprecipitation from brain homogenates and transfected cells, electrophysiology, saxitoxin binding, immunocytochemistry of developing and adult nodes","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1–2 — electrophysiological functional readout, co-IP from native tissue, saxitoxin binding; 152 citations","pmids":["11567041"],"is_preprint":false},{"year":2003,"finding":"F3/contactin (CNTN1) acts as a functional ligand for Notch receptors on oligodendrocyte precursor cells. This trans-extracellular interaction triggers gamma-secretase-dependent nuclear translocation of the Notch intracellular domain (NICD). F3/Notch signaling promotes oligodendrocyte precursor cell differentiation and upregulates MAG in OLN-93 cells. This signaling is blocked by dominant-negative Notch1/Notch2 or Deltex1 mutants lacking RING-H2, but not by dominant-negative RBP-J or Hes1 antisense, establishing a non-canonical Notch/Deltex1 pathway distinct from Jagged/Notch canonical signaling.","method":"Cell co-culture, NICD nuclear translocation assays, MAG expression by western blot, dominant-negative constructs, gamma-secretase inhibition","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — multiple dominant-negative and inhibitor experiments, functional differentiation readout; 305 citations","pmids":["14567914"],"is_preprint":false},{"year":2003,"finding":"Caspr regulates the processing and surface transport of contactin (CNTN1): co-expression of Caspr with contactin produces a low molecular weight (LMw), endoglycosidase H-sensitive isoform of contactin at the cell membrane that remains associated with Caspr but is unable to bind neurofascin-155 (NF155). Conversely, NF155 binds directly to contactin when Caspr is absent. Deletion of Caspr in mice shifts contactin from the LMw to a HMw glycoform, confirming that Caspr regulates contactin's intracellular processing and transport, thereby gating its ability to interact with other CAMs.","method":"Co-immunoprecipitation, EndoH glycosylation analysis, transfection in heterologous cells, Caspr knockout mice","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — biochemical glycoform analysis, co-IP, knockout mouse validation; 124 citations","pmids":["14676309"],"is_preprint":false},{"year":2004,"finding":"Sodium channel beta1 subunit-mediated modulation of Nav1.2 and increase in cell surface density requires interaction with both contactin (CNTN1) and ankyrin. A beta1Y181E mutant that cannot interact with ankyrinG fails to modulate Nav1.2 channel function even though it associates with Nav1.2 and contactin. The contactin interaction site was mapped to two regions of the beta1 Ig loop using beta1/beta2 chimeras.","method":"beta1/beta2 chimera construction, electrophysiology, co-immunoprecipitation, cell surface expression measurement","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — site-directed mutagenesis, chimera analysis, electrophysiology, co-IP; 100 citations","pmids":["14761957"],"is_preprint":false},{"year":1999,"finding":"Contactin-null (contactin-/-) mice display severe ataxia and survive only until postnatal day 18. Cerebellar analysis reveals defects in granule cell axon guidance and in dendritic projections from granule and Golgi cells, demonstrating that contactin (CNTN1) controls axonal and dendritic interactions of cerebellar interneurons and is required for cerebellar microorganization in vivo.","method":"Gene knockout in mice (homologous recombination), behavioral assessment, histological and morphological analysis of cerebellum","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cerebellar phenotype; 190 citations","pmids":["10595523"],"is_preprint":false},{"year":2003,"finding":"Premature expression of F3/contactin (CNTN1) under TAG-1 regulatory sequences in transgenic mice causes a transient reduction in cerebellar size due to decreased granule cell proliferation (at P3) followed by increased cycling (at P8–P11), and failure of Purkinje cell dendritic elaboration. This demonstrates that precise spatiotemporal regulation of CNTN1 expression is critical for granule cell proliferation, differentiation, and Purkinje cell development.","method":"Transgenic mouse generation (TAG/F3), histological analysis, BrdU proliferation assays, cerebellar morphometry","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 — defined transgenic model with quantitative cellular phenotypes","pmids":["12441289"],"is_preprint":false},{"year":2005,"finding":"Cntn1 (F3/contactin) is duplicated in teleost fish (goldfish, zebrafish, fugu), resulting in Cntn1a and Cntn1b paralogs that show subfunctionalization. In adult goldfish, Cntn1b is expressed in oligodendrocytes and is upregulated in retinal ganglion cells after optic nerve transection, suggesting a role in axonal regeneration in addition to development.","method":"Gene cloning, phylogenetic analysis, in situ hybridization during development, optic nerve transection model with subsequent expression analysis","journal":"Molecular and cellular neurosciences","confidence":"Medium","confidence_rationale":"Tier 3 — expression and cloning study with functional inference from regeneration model","pmids":["15691716"],"is_preprint":false},{"year":2006,"finding":"F3/contactin (CNTN1) interacts with Notch receptors and promotes oligodendrocyte development through a Deltex1-dependent, non-canonical Notch pathway. NB-3, another contactin family member, similarly interacts with Notch via Deltex1. This F3/Notch/Deltex1 signaling cascade promotes generation and maturation of oligodendrocyte precursor cells, distinct from the canonical Jagged1/Notch pathway which inhibits further differentiation.","method":"Cell co-culture assays, dominant-negative constructs, animal model analysis","journal":"Developmental neuroscience","confidence":"Medium","confidence_rationale":"Tier 3 — review summarizing previously published mechanistic work, limited new primary data","pmids":["16508301"],"is_preprint":false},{"year":2016,"finding":"CNTN1 promotes prostate cancer metastasis: CNTN1 knockdown reduces prostate cancer stem-like cell (PCSC)-mediated tumor initiation, whereas CNTN1 overexpression enhances invasion in vitro and promotes xenograft tumor formation and lung metastasis in vivo. CNTN1 overexpression results in elevated AKT activation and reduced E-cadherin expression in DU145 cells and corresponding xenografts, placing CNTN1 upstream of AKT signaling and EMT.","method":"shRNA knockdown, overexpression in DU145 cells, xenograft mouse models, in vitro invasion assays, western blotting for AKT phosphorylation and E-cadherin","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — KD and OE with defined molecular and in vivo phenotypes, pathway placement via AKT and E-cadherin","pmids":["26795349"],"is_preprint":false},{"year":2011,"finding":"VEGF-C upregulates CNTN1 expression in esophageal cancer cells, and CNTN1 mediates VEGF-C's pro-tumorigenic effects on cell proliferation and migration. Silencing of CNTN1 reverses the increased proliferation and migration induced by VEGF-C overexpression, indicating CNTN1 acts downstream of VEGF-C signaling in esophageal cancer progression.","method":"VEGF-C overexpression and shRNA knockdown in TE-1 and Eca-109 cells, CNTN1 siRNA rescue, cell proliferation and migration assays, nude mouse xenografts","journal":"Cytokine","confidence":"Medium","confidence_rationale":"Tier 3 — functional knockdown and rescue experiments but no direct biochemical pathway mapping","pmids":["21482472"],"is_preprint":false},{"year":2018,"finding":"Contactin-1/F3 (Cntn1) is required for neuronal migration during cortical development. shRNA-mediated knockdown of Cntn1 in neural stem cells via in utero electroporation delays neuronal migration and causes abnormal leading process morphology with more multipolar cells in deep cortical layers. Cntn1 KD upregulates RhoA, and expression of dominant-negative RhoAN19 partially rescues the migration defects, placing Cntn1 upstream of RhoA as a negative regulator of this GTPase during cortical neuronal migration.","method":"In utero electroporation with shRNA, immunohistochemistry, dominant-negative RhoA rescue experiment","journal":"Frontiers in molecular neuroscience","confidence":"High","confidence_rationale":"Tier 2 — in vivo KD, genetic epistasis via dominant-negative rescue, defined molecular pathway","pmids":["30515076"],"is_preprint":false},{"year":2019,"finding":"Anti-contactin-1 (CNTN1) IgG3 autoantibodies induce acute conduction block and motor deficits in rats via complement deposition at paranodal regions, without inflammatory infiltrates or dispersion of paranodal proteins. Intraneural injection of IgG3-predominant patient IgG caused conduction blocks in 83% of animals and paranodal complement deposition, whereas chronic-phase IgG4-predominant patient IgG caused less frequent and less severe effects, indicating IgG3 anti-CNTN1 mediates acute paranodopathy via complement.","method":"Passive transfer of patient IgG to Lewis rats, nerve conduction studies, immunohistochemistry for complement, motor function testing","journal":"Journal of neuroinflammation","confidence":"High","confidence_rationale":"Tier 2 — in vivo passive transfer model with electrophysiological and immunohistochemical readouts","pmids":["30953561"],"is_preprint":false},{"year":2020,"finding":"CNTN1 promotes docetaxel resistance and epithelial-to-mesenchymal transition (EMT) in prostate cancer via the PI3K/Akt signaling pathway. Knockdown of CNTN1 in docetaxel-resistant PC3 and DU145 cells attenuates proliferation, migration, invasion, EMT phenotype, and drug resistance, and decreases PI3K/Akt activity both in vitro and in vivo (xenograft model).","method":"shRNA knockdown in drug-resistant cell lines, CCK-8 proliferation assay, flow cytometry, wound-healing, transwell invasion, western blotting, xenograft mouse model","journal":"Archives of medical science","confidence":"Medium","confidence_rationale":"Tier 2–3 — KD with pathway marker analysis in vitro and in vivo, but no direct mechanistic link established between CNTN1 and PI3K","pmids":["33488868"],"is_preprint":false},{"year":2013,"finding":"F3/contactin promotes adult hippocampal neurogenesis, synaptic plasticity, and memory in mice: TAG/F3 transgenic mice overexpressing CNTN1 show increased hippocampal size, enhanced precursor proliferation, increased CA1 long-term potentiation, and improved spatial and object recognition memory. These effects correlate with increased phosphorylated CREB expression, suggesting CNTN1 overexpression activates the CREB signaling pathway to promote neurogenesis and synaptic plasticity.","method":"Transgenic mouse model (TAG/F3), BrdU/NeuN proliferation assays, LTP electrophysiology, behavioral memory tests, western blotting for pCREB","journal":"Hippocampus","confidence":"Medium","confidence_rationale":"Tier 2 — transgenic model with multiple functional readouts, but CREB pathway link is correlative","pmids":["23939883"],"is_preprint":false},{"year":2021,"finding":"Cntn1 expression is upregulated in the hippocampus (but not medial prefrontal cortex) in response to chronic unpredictable stress (CUS) in rodents. Adeno-associated virus-mediated overexpression of Cntn1 in the hippocampus triggers anxiety- and depression-like phenotypes, activates microglia, upregulates pro-inflammatory cytokines (IL1α, IL6, Ccl2), downregulates anti-inflammatory cytokines (IL4, CD206), and impairs hippocampal immature neurons (decreased doublecortin+ cells).","method":"Chronic unpredictable stress model, AAV stereotactic injection for Cntn1 overexpression, real-time qPCR for cytokines, immunohistochemistry for doublecortin","journal":"Brain, behavior, and immunity","confidence":"Medium","confidence_rationale":"Tier 2 — AAV-mediated overexpression with defined behavioral and cellular phenotypes, mechanistic link to neuroinflammation","pmids":["33737174"],"is_preprint":false},{"year":2022,"finding":"Hippocampal F3/Contactin (CNTN1) is implicated in depression: chronic restraint stress and chronic social defeat stress decrease hippocampal CNTN1 expression. AAV-mediated overexpression of hippocampal CNTN1 prevents stress-induced depressive-like behaviors and reverses dysfunction of the hippocampal BDNF-CREB signaling cascade and neurogenesis impairment. Conversely, AAV-mediated knockdown of hippocampal CNTN1 abolishes the antidepressant effects of vortioxetine.","method":"Chronic stress mouse models, AAV-mediated overexpression and knockdown, western blotting, immunofluorescence for neurogenesis markers, behavioral tests","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 — bidirectional genetic manipulation with behavioral and molecular readouts, pathway placement via BDNF-CREB","pmids":["35609645"],"is_preprint":false},{"year":2023,"finding":"Hippocampal CNTN1 overexpression triggers cognitive deficits by boosting crosstalk between microglia and astrocytes. CNTN1 overexpression activates microglia, which triggers astrocyte activation with aberrant upregulation of excitatory amino acid transporters EAAT1/EAAT2, leading to LTP impairment. Minocycline (microglial activation inhibitor) reverses LTP impairment caused by CNTN1 overexpression, establishing that CNTN1-driven microglial activation is mechanistically upstream of astrocyte dysfunction and LTP deficits.","method":"AAV stereotactic injection for CNTN1 overexpression, LTP electrophysiology, immunohistochemistry for microglia/astrocyte markers, EAAT1/2 western blotting, minocycline pharmacological rescue, behavioral cognitive tests","journal":"Aging and disease","confidence":"High","confidence_rationale":"Tier 2 — bidirectional genetic and pharmacological dissection with defined cellular and electrophysiological phenotypes","pmids":["37196127"],"is_preprint":false},{"year":2024,"finding":"Clemastine preferentially promotes F3/Contactin-1 (CNTN1)-mediated non-canonical Notch-1/Deltex-1 signaling over canonical Jagged-1/Notch-1 signaling during remyelination. In the EAE rat model, CLM restores CNTN1 levels, elevates Deltex-1 gene expression, and reduces HES1/5 (canonical Notch targets), correlating with enhanced oligodendrocyte differentiation and myelination markers (MBP, CNPase, PLP, ASPA). F3/CNTN1-mediated non-canonical Notch signaling is proposed as the mechanism underlying clemastine's remyelinating effect.","method":"EAE rat model, pharmacological clemastine treatment, behavioral tests (rotarod, open-field, grip), Luxol fast blue histology, immunohistochemistry, gene expression analysis","journal":"International immunopharmacology","confidence":"Medium","confidence_rationale":"Tier 3 — pharmacological model with correlative pathway analysis; no direct CNTN1 manipulation to establish causality","pmids":["38232534"],"is_preprint":false}],"current_model":"CNTN1 (F3/contactin) is a GPI-anchored, six Ig-domain plus four FNIII-repeat cell adhesion molecule that operates as a multifunctional signaling hub: it localizes to lipid raft microdomains where it physically associates with fyn kinase (via FNIII repeats) and L1 to transduce tyrosine phosphorylation signals; it serves as a neuronal receptor for RPTPβ (via its Ig domains) and as a functional Notch ligand on oligodendrocyte precursors (triggering non-canonical Notch/Deltex1 signaling and myelination); it forms a ternary complex with Caspr (which it chaperones to the plasma membrane via lipid rafts) and NrCAM at paranodal axoglial junctions; it increases voltage-gated Na+ channel (Nav1.2) surface density through interaction with the beta1 subunit; it regulates cortical neuronal migration by suppressing RhoA activity; and in cancer contexts it activates AKT signaling and suppresses E-cadherin to promote invasion and chemoresistance, while in the hippocampus it modulates BDNF-CREB signaling, adult neurogenesis, and microglial-astrocytic crosstalk affecting synaptic plasticity and cognition."},"narrative":{"teleology":[{"year":1989,"claim":"Establishing that CNTN1 is a GPI-anchored Ig-superfamily member on neuronal surfaces resolved its structural class and membrane attachment mode, foundational for all subsequent interaction studies.","evidence":"cDNA cloning, sequence analysis, immunocytochemistry, and subcellular fractionation of mouse brain","pmids":["2474555"],"confidence":"High","gaps":["No functional role demonstrated","No interacting partners identified"]},{"year":1995,"claim":"Identifying RPTPβ as an extracellular ligand for CNTN1 and demonstrating that CNTN1 resides in lipid rafts in complex with Fyn and L1 established CNTN1 as a signal-transducing receptor despite lacking a transmembrane domain.","evidence":"Expression cloning, neurite outgrowth assays with antibody blocking (RPTPβ), co-IP from cerebellum with detergent-resistant membrane fractionation (Fyn/L1)","pmids":["7628014","7595520"],"confidence":"High","gaps":["Downstream signaling cascades beyond Fyn phosphorylation undefined","Structural basis of RPTPβ–CNTN1 interaction unknown"]},{"year":1996,"claim":"Mapping signal transduction to the FNIII repeats of CNTN1 resolved how a GPI-anchored protein without an intracellular domain can activate tyrosine kinase signaling — through domain-specific association with Fyn kinase.","evidence":"Truncation mutants in CHO cells, metabolic 32P labeling, co-IP with Fyn from cerebellum","pmids":["8907714"],"confidence":"High","gaps":["Identity of downstream substrates of Fyn activated by CNTN1 unknown","Whether FNIII–Fyn interaction is direct or via an adaptor not resolved"]},{"year":1998,"claim":"Demonstrating that CNTN1 Ig domains interact with tenascin-R to promote neurite defasciculation via PKC signaling, and that TAG-1 modulates CNTN1 effects in lipid rafts, revealed CNTN1 as a context-dependent regulator of axon fasciculation.","evidence":"Cerebellar explant cultures, antibody/antisense perturbation, pharmacological PKC inhibition; CHO co-transfection and co-IP from brain for TAG-1","pmids":["9589384","9712656"],"confidence":"High","gaps":["PKC isoform specificity not determined","Stoichiometry and dynamics of the CNTN1–TAG-1 raft complex undefined"]},{"year":1999,"claim":"The contactin-null mouse phenotype — lethal ataxia with granule cell axon guidance defects — proved that CNTN1 is essential for cerebellar circuit formation in vivo, moving beyond cell-culture studies.","evidence":"Gene knockout by homologous recombination, histological analysis of cerebellum, behavioral assessment","pmids":["10595523"],"confidence":"High","gaps":["Molecular pathways disrupted in vivo not identified","Contribution of individual CNTN1 interactions to cerebellar phenotype unresolved"]},{"year":1999,"claim":"Discovering that CNTN1 chaperones Caspr to the plasma membrane via lipid-raft recruitment through its FNIII repeats explained how the Caspr–CNTN1 complex assembles at paranodal junctions.","evidence":"Co-transfection in CHO/neuroblastoma cells, surface biotinylation, Triton X-100 fractionation, domain-deletion mapping","pmids":["10769038"],"confidence":"High","gaps":["Whether additional factors stabilize the complex at paranodes not tested","Mechanism by which GPI anchor plus FNIII domains recruit Caspr to rafts structurally unresolved"]},{"year":2001,"claim":"Showing that CNTN1 increases Nav1.2 surface density through specific interaction with the β1 subunit at nodes of Ranvier established a direct role in sodium channel clustering and saltatory conduction.","evidence":"Co-IP from brain, electrophysiology showing 3–4-fold current increase, saxitoxin binding, co-localization at nodes","pmids":["11567041"],"confidence":"High","gaps":["Whether CNTN1 is required for Nav channel clustering in vivo not tested with knockout","Interplay between CNTN1–β1 and ankyrin-dependent clustering incompletely dissected"]},{"year":2003,"claim":"Identifying CNTN1 as a non-canonical Notch ligand that triggers Deltex1-dependent, RBP-J-independent signaling to promote oligodendrocyte differentiation revealed a novel myelination pathway distinct from canonical Notch signaling.","evidence":"Cell co-culture with NICD translocation assays, MAG induction, dominant-negative Notch/Deltex1/RBP-J constructs, gamma-secretase inhibition","pmids":["14567914"],"confidence":"High","gaps":["In vivo requirement for CNTN1–Notch in myelination not demonstrated by conditional knockout","Structural basis for CNTN1–Notch interaction unknown"]},{"year":2003,"claim":"Demonstrating that Caspr regulates CNTN1 glycoform processing and gates its ability to bind NF155 revealed bidirectional regulation within the paranodal complex — CNTN1 delivers Caspr to the surface, but Caspr reciprocally controls CNTN1's binding repertoire.","evidence":"Co-IP, EndoH glycosylation analysis, Caspr knockout mouse glycoform shift","pmids":["14676309"],"confidence":"High","gaps":["Functional consequence of altered glycoform for paranodal integrity not fully tested","Whether glycoform regulation occurs in all neuronal subtypes unclear"]},{"year":2016,"claim":"Placing CNTN1 upstream of PI3K/AKT activation and E-cadherin suppression in prostate cancer extended its role beyond neural contexts and identified it as a driver of invasion and chemoresistance via EMT.","evidence":"shRNA knockdown and overexpression in DU145 cells, xenograft models, western blotting for pAKT and E-cadherin","pmids":["26795349","33488868"],"confidence":"High","gaps":["Direct biochemical mechanism linking CNTN1 to PI3K activation not identified","Whether GPI-anchored CNTN1 signals through the same raft/Fyn mechanism in cancer cells unknown"]},{"year":2018,"claim":"Demonstrating that CNTN1 knockdown impairs cortical neuronal migration and upregulates RhoA — rescued by dominant-negative RhoA — established CNTN1 as a negative regulator of RhoA during corticogenesis, adding a migration role beyond axon guidance.","evidence":"In utero electroporation with shRNA, dominant-negative RhoAN19 rescue, immunohistochemistry","pmids":["30515076"],"confidence":"High","gaps":["Mechanism by which GPI-anchored CNTN1 suppresses RhoA activity not identified","Whether this pathway operates in adult neuronal migration unknown"]},{"year":2019,"claim":"Passive transfer of anti-CNTN1 IgG3 autoantibodies causing complement-dependent paranodal conduction block in rats established CNTN1 as a pathogenic autoantibody target in inflammatory neuropathy.","evidence":"Passive transfer to Lewis rats, nerve conduction studies, paranodal complement immunohistochemistry","pmids":["30953561"],"confidence":"High","gaps":["Whether complement fixation directly disrupts CNTN1–Caspr complex or causes broader paranodal damage unresolved","Human in vivo validation of IgG subclass-specific pathogenicity limited"]},{"year":2022,"claim":"Bidirectional AAV manipulation in the hippocampus showed that CNTN1 modulates depressive-like behavior through the BDNF–CREB signaling cascade and neurogenesis, extending its role to adult affective circuits.","evidence":"AAV-mediated overexpression and knockdown in hippocampus, chronic stress models, western blotting for BDNF/pCREB, behavioral assays","pmids":["35609645"],"confidence":"Medium","gaps":["Direct molecular link between CNTN1 and BDNF expression not established","Cell-type specificity of CNTN1 action in hippocampus not resolved"]},{"year":2023,"claim":"Identifying microglia–astrocyte crosstalk as the downstream effector of hippocampal CNTN1 overexpression — with aberrant EAAT1/2 upregulation impairing LTP — revealed a non-cell-autonomous mechanism linking CNTN1 to cognitive dysfunction.","evidence":"AAV overexpression, LTP electrophysiology, minocycline pharmacological rescue, EAAT1/2 western blotting, microglia/astrocyte marker immunohistochemistry","pmids":["37196127"],"confidence":"High","gaps":["Mechanism by which neuronal CNTN1 activates microglia is unknown","Whether CNTN1-mediated microglial activation involves direct cell contact or secreted factors not determined"]},{"year":null,"claim":"Key unresolved questions include the structural basis of CNTN1's multi-ligand recognition, the mechanism by which a GPI-anchored protein activates intracellular pathways such as PI3K/AKT and RhoA suppression, in vivo conditional knockout validation of the CNTN1–Notch myelination pathway, and the cell-type-specific signaling logic that determines whether CNTN1 promotes or impairs neurogenesis and plasticity.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of full-length CNTN1 or its complexes","No conditional knockout addressing myelination or hippocampal functions","Mechanism coupling GPI-anchored CNTN1 to intracellular RhoA or AKT signaling undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,1,4,7,9,12,15,16]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[16,22]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[4,5,16]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,2,12,14,15]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[10,14]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,10]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[4,9,15,18,19,25,31]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[19,20,25]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,16,23,27]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[1,7,11,12,17]}],"complexes":["Caspr-CNTN1-NrCAM paranodal complex","CNTN1-L1-Fyn lipid raft complex","CNTN1-Nav1.2-β1 nodal complex"],"partners":["CNTNAP1","NRCAM","FYN","L1CAM","PTPRZ1","NOTCH1","SCN2A","SCN1B"],"other_free_text":[]},"mechanistic_narrative":"CNTN1 (contactin-1/F3) is a GPI-anchored immunoglobulin superfamily cell adhesion molecule with six Ig-like domains and four fibronectin type III repeats that functions as a multivalent signaling hub in neural development, myelination, and synaptic plasticity [PMID:2474555, PMID:7959734]. Through its Ig domains it engages extracellular ligands including RPTPβ, tenascin-R/C, Caspr, and Notch receptors, while its FNIII repeats recruit the Src-family kinase Fyn and chaperone Caspr to lipid-raft microdomains for surface delivery and paranodal junction assembly [PMID:7628014, PMID:8907714, PMID:10769038, PMID:7595520]. CNTN1 acts as a non-canonical Notch ligand on oligodendrocyte precursors, triggering Deltex1-dependent signaling that promotes oligodendrocyte differentiation and myelination, and it increases neuronal Nav1.2 surface density via the β1 subunit at nodes of Ranvier [PMID:14567914, PMID:11567041]. In vivo, CNTN1 is required for cerebellar granule cell axon guidance, cortical neuronal migration through suppression of RhoA, and hippocampal neurogenesis and synaptic plasticity via BDNF–CREB signaling and microglia–astrocyte crosstalk [PMID:10595523, PMID:30515076, PMID:37196127, PMID:35609645]."},"prefetch_data":{"uniprot":{"accession":"Q12860","full_name":"Contactin-1","aliases":["Glycoprotein gp135","Neural cell surface protein F3"],"length_aa":1018,"mass_kda":113.3,"function":"Contactins mediate cell surface interactions during nervous system development. Involved in the formation of paranodal axo-glial junctions in myelinated peripheral nerves and in the signaling between axons and myelinating glial cells via its association with CNTNAP1. Participates in oligodendrocytes generation by acting as a ligand of NOTCH1. Its association with NOTCH1 promotes NOTCH1 activation through the released notch intracellular domain (NICD) and subsequent translocation to the nucleus. 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localized to glycolipid-enriched membrane subdomains and interacts with L1 and fyn kinase in cerebellum.","date":"1995","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/7595520","citation_count":135,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15146195","id":"PMC_15146195","title":"Time-controlled transcardiac perfusion cross-linking for the study of protein interactions in complex tissues.","date":"2004","source":"Nature biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/15146195","citation_count":133,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"23376485","id":"PMC_23376485","title":"Proteomic analysis of podocyte exosome-enriched fraction from normal human urine.","date":"2013","source":"Journal of proteomics","url":"https://pubmed.ncbi.nlm.nih.gov/23376485","citation_count":126,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"14676309","id":"PMC_14676309","title":"Caspr regulates the processing of contactin and inhibits its binding to neurofascin.","date":"2003","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/14676309","citation_count":124,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"37616343","id":"PMC_37616343","title":"The midnolin-proteasome pathway catches proteins for ubiquitination-independent degradation.","date":"2023","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/37616343","citation_count":117,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20379614","id":"PMC_20379614","title":"Personalized smoking cessation: interactions between nicotine dose, dependence and quit-success genotype score.","date":"2010","source":"Molecular medicine (Cambridge, Mass.)","url":"https://pubmed.ncbi.nlm.nih.gov/20379614","citation_count":108,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"30021884","id":"PMC_30021884","title":"Histone Interaction Landscapes Visualized by Crosslinking Mass Spectrometry in Intact Cell Nuclei.","date":"2018","source":"Molecular & cellular proteomics : MCP","url":"https://pubmed.ncbi.nlm.nih.gov/30021884","citation_count":101,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"14761957","id":"PMC_14761957","title":"Sodium channel beta1 subunit-mediated modulation of Nav1.2 currents and cell surface density is dependent on interactions with contactin and ankyrin.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/14761957","citation_count":100,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"35922511","id":"PMC_35922511","title":"A physical wiring diagram for the human immune system.","date":"2022","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/35922511","citation_count":92,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":53293,"output_tokens":5383,"usd":0.120312},"stage2":{"model":"claude-opus-4-6","input_tokens":8920,"output_tokens":3483,"usd":0.197513},"total_usd":0.727657,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":66871,"output_tokens":9390,"usd":0.170732},"round2_rules_fired":"R2","round2_stage2":{"model":"claude-opus-4-6","input_tokens":13185,"output_tokens":3739,"usd":0.2391}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1989,\n      \"finding\": \"Mouse F3/contactin is a GPI-anchored member of the immunoglobulin superfamily with six C2-type Ig domains and fibronectin type III repeats, expressed on neuronal cell surfaces (especially neurites), and proposed to mediate cell surface interactions during nervous system development based on structural similarity to known adhesion proteins.\",\n      \"method\": \"cDNA cloning, sequence analysis, PI-PLC treatment, immunofluorescence, subcellular fractionation, Western blotting\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original molecular characterization with multiple orthogonal methods, foundational paper\",\n      \"pmids\": [\"2474555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"F3/contactin mediates neuronal repulsion by the extracellular matrix glycoprotein J1-160/180 (tenascin-C); F3 on cerebellar neurons or F3-transfected CHO cells recognizes J1-160/180 substrate and triggers loss of adhesion and inhibition of neurite outgrowth. Antibody blocking experiments confirmed F3-mediated avoidance of J1-160/180 borders.\",\n      \"method\": \"Cell adhesion assays on substrate-coated surfaces, F3-transfected CHO cells, antibody blocking, neurite outgrowth assays\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple functional assays with transfected cells and antibody blocking, replicated across cell types\",\n      \"pmids\": [\"7678967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Human contactin (CNTN1) is GPI-anchored (confirmed by PI-PLC treatment of transfected cells and metabolic labeling with [3H]-ethanolamine), consists of six C2 Ig-domains and four fibronectin type III repeats, and the gene maps to chromosome 12q11-q12.\",\n      \"method\": \"cDNA cloning, PI-PLC treatment, [3H]-ethanolamine metabolic labeling, fluorescence in situ hybridization\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — biochemical validation of GPI anchor with metabolic labeling and PI-PLC, plus chromosomal mapping\",\n      \"pmids\": [\"7959734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"F3/contactin transduces signals across the membrane via association with protein tyrosine kinases; during F3-mediated cell aggregation, tyrosine phosphorylation increases, and F3 associates with Fyn kinase in cerebellar cells. The FNIII repeats are essential for kinase association and downstream phosphorylation signaling.\",\n      \"method\": \"Co-immunoprecipitation, 32P metabolic labeling, genistein inhibition, deletion mutants (F3 lacking FNIII repeats), in vitro kinase assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — co-IP with mutagenesis identifying FNIII domain requirement, confirmed in both transfected cells and native brain tissue\",\n      \"pmids\": [\"8907714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"F3/contactin is expressed by oligodendrocyte-lineage cells (not only neurons) and is present in myelin; oligodendroglial F3 is GPI-anchored and susceptible to PI-PLC cleavage, identical in mRNA size to neuronal F3.\",\n      \"method\": \"Biosynthetic labeling, 2D gel electrophoresis, microsequencing, Western blotting, immunoprecipitation, immunofluorescence double-staining, Northern blot, PI-PLC treatment\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods confirming expression and GPI anchoring in oligodendrocytes\",\n      \"pmids\": [\"9063727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"F3/contactin and TAG-1 interact functionally: F3 on CHO cells inhibits neurite outgrowth and induces fasciculation of cerebellar granule cells, but co-expression of TAG-1 with F3 blocks this inhibitory effect. F3 and TAG-1 co-immunoprecipitate from Triton X-100-insoluble microdomains of newborn brain, indicating they associate in lipid rafts under physiological conditions.\",\n      \"method\": \"Granule cell culture on CHO monolayers, co-immunoprecipitation from brain lipid raft fractions, antibody-mediated cross-linking co-clustering in transfected CHO cells, microsphere binding assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — functional assay combined with biochemical co-IP from native brain tissue\",\n      \"pmids\": [\"9712656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Tenascin-R promotes neurite defasciculation through interaction with neuronal F3/contactin; the N-terminal cysteine-rich/EGF-like region of tenascin-R interacts with the Ig-like domains of F3. Disruption of this interaction (antibodies, antisense oligonucleotide) increases fasciculation, and phorbol ester (PKC activator) reverts antibody-induced fasciculation.\",\n      \"method\": \"Cerebellar explant cultures, antibody blocking, antisense oligonucleotides, domain mapping, PKC inhibitor/activator pharmacology\",\n      \"journal\": \"Journal of neuroscience research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple perturbation approaches (antibody, antisense, pharmacology) with functional readout in explants\",\n      \"pmids\": [\"9589384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"F3/contactin is co-localized with oxytocin and vasopressin in secretory granules in hypothalamic magnocellular neurons and is released at axon terminals in the neurohypophysis via the regulated secretory pathway; physiological stimulation (lactation, osmotic challenge) increases F3 mRNA and redistributes F3 from neurohypophysis to hypothalamic nuclei.\",\n      \"method\": \"Immunocytochemistry, immunoblot, in situ hybridization, confocal microscopy, electron microscopy, sucrose density gradient fractionation\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple imaging and biochemical fractionation methods linking F3 to regulated secretory pathway\",\n      \"pmids\": [\"9651216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"NrCAM is the functional receptor on cerebellar granule cell growth cones that mediates the inhibitory effect of F3 on axonal elongation; F3Fc microspheres bind via NrCAM (not L1) and move retrogradely at the growth cone leading edge coupled to actin retrograde flow (velocity ~5.7 µm/min), disrupted by cytochalasin B. NrCAM clustering is required for retrograde mobility.\",\n      \"method\": \"Microsphere binding assay, time-lapse video-microscopy, cytochalasin B treatment, cross-linking F3Fc chimeras, growth cone motility analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — live imaging with pharmacological and structural perturbations, receptor identified by selective binding\",\n      \"pmids\": [\"10462518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"F3/contactin is required for surface transport of paranodin/caspr to the plasma membrane; co-transfection of F3 with paranodin in CHO or neuroblastoma cells drives paranodin to the cell surface, while paranodin alone is not surface-expressed. The Ig domains of F3 mediate the association with paranodin (mapped by co-immunoprecipitation), and the GPI anchor plus FNIII repeats of F3 are needed to recruit paranodin into lipid raft microdomains.\",\n      \"method\": \"Co-transfection, confocal microscopy, cell surface biotinylation, co-immunoprecipitation, Triton X-100-insoluble microdomain fractionation, deletion constructs (F3-Ig lacking FNIII)\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in transfected cells with domain mapping and multiple biochemical readouts\",\n      \"pmids\": [\"10769038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"F3/contactin surface expression in hypothalamic axons is activity-dependent and mediated via the regulated secretory pathway; GPI-PLC removal of surface F3 is followed by re-expression on axons within 5 h, accelerated by neuronal depolarization (K+) or GABA-A blockade (bicuculline) and inhibited by Ca2+ channel blockade (Mn2+), Na+ channel blockade (TTX), or glutamate antagonists.\",\n      \"method\": \"Hypothalamic organotypic slice culture, GPI-PLC treatment, live-cell antibody labeling, immunocytochemistry, pharmacological perturbations, immunoblot\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple pharmacological perturbations with live imaging and biochemical readouts in organotypic cultures\",\n      \"pmids\": [\"11556889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"F3/contactin interacts with Notch receptors at the axoglial interface and promotes oligodendrocyte development through a pathway requiring Deltex1 as an intermediate element; NB-3 similarly activates Notch, and these non-canonical Notch signaling events drive oligodendrocyte differentiation.\",\n      \"method\": \"In vitro binding, transfection, animal models (referenced in review), genetic pathway analysis\",\n      \"journal\": \"Biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — review summarizing experimental findings; primary mechanistic data cited but not detailed in this abstract\",\n      \"pmids\": [\"12500940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Premature expression of F3/contactin in cerebellar granule cells (driven by TAG-1 promoter in transgenic mice) reduces granule cell number and Purkinje cell dendritic elaboration during the first two postnatal weeks, demonstrating that the precise spatiotemporal regulation of F3/contactin is critical for normal cerebellar morphogenesis including precursor proliferation and cell differentiation.\",\n      \"method\": \"Transgenic mouse generation (TAG/F3), histological analysis, BrdU proliferation assay, immunohistochemistry\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — defined cellular phenotype from genetic gain-of-function with quantitative histological readouts\",\n      \"pmids\": [\"12441289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"F3/contactin overexpression (TAG/F3 transgenic mice) promotes adult hippocampal neurogenesis, increases precursor proliferation and NeuN expression, enhances CA1 long-term potentiation, and improves spatial and object recognition memory; these effects correlate with increased phospho-CREB levels.\",\n      \"method\": \"Transgenic mouse model, BrdU/NeuN immunostaining, LTP electrophysiology, behavioral memory tasks, Western blotting for p-CREB\",\n      \"journal\": \"Hippocampus\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — defined cellular and behavioral phenotypes with molecular correlate in a genetic model\",\n      \"pmids\": [\"23939883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CNTN1 knockdown in prostate cancer stem-like cells reduces tumor initiation, while CNTN1 overexpression enhances invasion in vitro and promotes xenograft tumor formation and lung metastasis in vivo; CNTN1 overexpression elevates AKT phosphorylation and reduces E-cadherin expression.\",\n      \"method\": \"shRNA knockdown, overexpression, invasion assay, xenograft mouse model, Western blotting for p-AKT and E-cadherin\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss- and gain-of-function with in vivo readout, but pathway placement (AKT, E-cadherin) is correlative\",\n      \"pmids\": [\"26795349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cntn1/contactin-1 knockdown in neural stem cells via in utero electroporation delays radial neuronal migration in the developing neocortex, causes abnormal leading process morphology and increased multipolar cells; Cntn1 KD upregulates RhoA, and expression of dominant-negative RhoAN19 partially rescues the migration defect.\",\n      \"method\": \"In utero electroporation with shRNA, in vivo cortical migration analysis, immunostaining, dominant-negative RhoA rescue experiment\",\n      \"journal\": \"Frontiers in molecular neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo loss-of-function with genetic epistasis (RhoA DN rescue), multiple phenotypic readouts\",\n      \"pmids\": [\"30515076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Anti-CNTN1 IgG3 autoantibodies induce acute conduction block and motor deficits in rats via paranodal complement deposition after intraneural injection; IgG4 anti-CNTN1 causes only minor conduction changes acutely. Conduction blocks were reversible within one week, with no inflammatory infiltrates detected.\",\n      \"method\": \"Passive transfer (intraneural injection) in Lewis rats, nerve conduction studies, behavioral motor testing, immunofluorescence for complement deposition and paranodal proteins\",\n      \"journal\": \"Journal of neuroinflammation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — passive transfer animal model with electrophysiological and histological readouts, compared IgG3 vs IgG4 subclasses\",\n      \"pmids\": [\"30953561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CNTN-1 knockdown in docetaxel-resistant prostate cancer cells attenuates proliferation, migration, invasion, EMT phenotype, and drug resistance while increasing apoptosis; CNTN-1 KD reduces PI3K/AKT signaling activity both in vitro and in vivo.\",\n      \"method\": \"shRNA knockdown, CCK-8 proliferation assay, flow cytometry, wound-healing, transwell invasion, Western blotting, xenograft tumor model\",\n      \"journal\": \"Archives of medical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with defined phenotype and pathway placement (PI3K/AKT), replicated in vivo, but single lab\",\n      \"pmids\": [\"33488868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cntn1 overexpression in the hippocampus via AAV triggers anxiety- and depression-like behaviors, activates microglia/phagocytosis, upregulates pro-inflammatory cytokines (IL1α, IL6, Ccl2), downregulates anti-inflammatory markers (IL4, CD206), and impairs hippocampal immature neurons (doublecortin+ cells) in the dentate gyrus.\",\n      \"method\": \"AAV-mediated hippocampal overexpression, behavioral tests, immunohistochemistry (doublecortin, microglia), qPCR for cytokine mRNA\",\n      \"journal\": \"Brain, behavior, and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function with defined behavioral and cellular phenotype, but single lab\",\n      \"pmids\": [\"33737174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Hippocampal F3/contactin overexpression via AAV prevents chronic restraint stress (CRS)- and chronic social defeat stress (CSDS)-induced depressive-like behaviors, reverses dysfunction in hippocampal BDNF-CREB signaling and neurogenesis; conversely, AAV-mediated knockdown of hippocampal F3/contactin abolishes the protective effects of the antidepressant vortioxetine.\",\n      \"method\": \"AAV overexpression and knockdown in mice, chronic stress models (CRS, CSDS), behavioral assays, Western blot for BDNF-CREB, immunofluorescence for neurogenesis\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional gain/loss of function with pharmacological epistasis (vortioxetine), but single lab\",\n      \"pmids\": [\"35609645\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CNTN1 overexpression in mouse hippocampus triggers cognitive deficits (novel object/place recognition, social cognition) by activating microglia and astrocytes, leading to aberrant EAAT1/EAAT2 expression and LTP impairment; the cognitive and LTP deficits are reversed by minocycline (microglial activation inhibitor), establishing microglial activation as the mechanistic link.\",\n      \"method\": \"AAV-mediated stereotactic CNTN1 overexpression, behavioral tests, immunohistochemistry, LTP electrophysiology, minocycline pharmacological rescue, Western blot for EAAT1/EAAT2\",\n      \"journal\": \"Aging and disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function with pharmacological rescue establishing pathway, single lab\",\n      \"pmids\": [\"37196127\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"F3/contactin interacts with Notch-1 receptor (non-canonical Notch signaling via Deltex1) at the axoglial interface to promote oligodendrocyte development; CLM preferentially enhances F3/Contactin-1/Notch-1 over Jagged-1/Notch-1 canonical signaling, increasing Deltex-1 gene expression and reducing Hes1/5 in an EAE rat model.\",\n      \"method\": \"EAE rat model, immunostaining, gene expression analysis, pharmacological treatment with clemastine\",\n      \"journal\": \"Developmental neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — pathway assignment supported by in vivo pharmacological experiment but limited biochemical detail in this abstract\",\n      \"pmids\": [\"16508301\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CNTN1 (F3/contactin) is a GPI-anchored immunoglobulin superfamily cell adhesion molecule expressed on neurons and oligodendrocytes that mediates axonal growth, fasciculation, and myelination through heterophilic binding to L1-family CAMs (NrCAM, neurofascin), extracellular matrix proteins (tenascin-R/C, J1-160/180), and RPTPβ/phosphacan; it is required for surface transport of paranodin/caspr to paranodal membrane microdomains, activates Fyn kinase signaling via its FNIII repeats, regulates radial neuronal migration in the developing cortex through RhoA suppression, promotes adult hippocampal neurogenesis and synaptic plasticity (LTP/CREB) in a dose-dependent manner, and its disruption by IgG3 autoantibodies causes paranodal complement deposition and acute conduction block.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper and extract discoveries only from KEEP papers.\n\n**Classification summary:**\n- KEEP: Papers about CNTN1 (contactin-1/F3/F11) - the GPI-anchored neuronal cell adhesion molecule\n- EXCLUDE: Papers about Ba/F3 cells (murine pro-B cell line), F3 fibrosis staging, F3 peptide (nucleolin-targeting), F3'H (flavonoid 3'-hydroxylase plants), F3 pyocins, F3 generation (transgenerational), F3 formant (vocal), CAEV gp135, Asp f3 (Aspergillus), talin F3 subdomain, bovine trophoblast F3 cell line, tissue factor (F3/TF coagulation), etc.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1989,\n      \"finding\": \"Mouse F3 (CNTN1) is a GPI-anchored member of the immunoglobulin superfamily with six C2-type Ig-like domains and fibronectin type III repeats, anchored to the membrane via a phosphatidylinositol anchor (no transmembrane domain), and is distributed between buffer-soluble, nonionic detergent-soluble, and detergent-insoluble fractions in brain. It is expressed on the neuronal cell surface, most prominently on neurites, and its gene transcripts are developmentally regulated with highest expression between 1–2 weeks after birth.\",\n      \"method\": \"cDNA cloning, sequence analysis, immunoblotting, immunocytochemistry, subcellular fractionation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original structural characterization with multiple orthogonal methods; foundational paper with 258 citations\",\n      \"pmids\": [\"2474555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"F3/11 (CNTN1) mediates neuronal repulsion by the extracellular matrix glycoprotein J1-160/180 (tenascin): F3 on the neuronal surface recognizes J1-160/180 substrate, and this interaction induces loss of substrate adhesion and inhibition of neurite outgrowth. Antibody blocking of F3 prevents the avoidance response at J1-160/180 substrate borders, establishing F3 as the receptor mediating repellent signaling.\",\n      \"method\": \"Cell adhesion assays with F3-transfected CHO cells, cerebellar neuron culture on J1-160/180 substrates, antibody blocking experiments\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal functional assays with transfected cells and primary neurons, antibody blocking; 232 citations\",\n      \"pmids\": [\"7678967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Human contactin (CNTN1) encodes a GPI-anchored protein (confirmed by PI-PLC treatment and [3H]-ethanolamine metabolic labeling) with six C2 Ig-domains and four FNIII repeats, 94% identical to mouse F3 and 78% identical to chick contactin/F11. The CNTN1 gene maps to human chromosome 12q11-q12.\",\n      \"method\": \"cDNA cloning, PI-PLC treatment of transfected cells, metabolic labeling with [3H]-ethanolamine, fluorescence in situ hybridization\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct biochemical demonstration of GPI anchor with multiple methods\",\n      \"pmids\": [\"7959734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"CNTN1 (F3) is localized to glycolipid-enriched membrane microdomains (lipid rafts) resistant to Triton X-100 solubilization in adult mouse cerebellum, and is physically associated in a complex with both the L1 transmembrane adhesion molecule and the fyn tyrosine kinase within these microdomains, as shown by co-immunoprecipitation.\",\n      \"method\": \"Detergent-resistant membrane fractionation, lipid composition analysis, co-immunoprecipitation from cerebellum extracts\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP from native brain tissue plus biochemical fractionation; 135 citations\",\n      \"pmids\": [\"7595520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The carbonic anhydrase (CAH) domain of receptor-type protein tyrosine phosphatase beta (RPTPbeta) binds specifically to contactin (CNTN1), a GPI-anchored neuronal recognition molecule, as identified by expression cloning. This interaction mediates cell adhesion and neurite growth of primary tectal neurons, and these responses are blocked by anti-contactin antibodies, establishing contactin as a functional neuronal receptor for RPTPbeta.\",\n      \"method\": \"Expression cloning in COS7 cells, fusion protein binding assays, neurite outgrowth assays with primary tectal neurons, antibody blocking\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — expression cloning, functional validation with primary neurons, antibody blocking; 359 citations\",\n      \"pmids\": [\"7628014\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"F3 (CNTN1) transduces signals across the membrane despite being GPI-anchored: F3-mediated cell aggregation induces tyrosine phosphorylation in F3-transfected CHO cells. F3 forms non-covalent complexes with protein tyrosine kinase(s), identified as fyn kinase in postnatal cerebellum. The FNIII repeats of F3 are essential for kinase association and for modulation of tyrosine phosphorylation, as a truncated F3 lacking all FNIII repeats fails to associate with a kinase or modulate phosphorylation.\",\n      \"method\": \"32P metabolic labeling, immunoprecipitation, antibody-mediated cross-linking, co-IP with fyn from cerebellum, truncation mutant analysis in CHO cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — domain mutagenesis, co-IP from native tissue, functional readout; 23 citations\",\n      \"pmids\": [\"8907714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"F3/contactin (CNTN1) is expressed not only by neurons but also by oligodendrocyte-lineage cells, including oligodendrocyte precursors and mature oligodendrocytes, and is present in myelin. Oligodendroglial F3 is GPI-anchored (sensitive to PI-PLC) and the same size mRNA as neuronal F3; F3 is absent from astrocytes.\",\n      \"method\": \"Biosynthetic labeling, 2D gel electrophoresis, microsequencing, Western blotting, immunoprecipitation, double immunofluorescence, Northern blots, PI-PLC cleavage\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods confirming oligodendroglial expression and GPI anchoring\",\n      \"pmids\": [\"9063727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"RPTPbeta extracellular regions induce neurite outgrowth via both contactin (CNTN1) and Nr-CAM: the betaCFS fusion protein promotes neurite outgrowth that is inhibited by antibodies against both Nr-CAM and contactin. Contactin and Nr-CAM form a complex that co-immunoprecipitates with betaCFS, indicating a ternary complex.\",\n      \"method\": \"Recombinant Fc fusion proteins as substrates, neurite outgrowth assays with primary neurons, antibody inhibition, co-immunoprecipitation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional neurite outgrowth assays, antibody blocking, co-IP; 153 citations\",\n      \"pmids\": [\"9049255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"F3 and TAG-1 interact functionally on cerebellar granule cell neurites: F3 transfectants inhibit neurite outgrowth and induce fasciculation of granule cells, whereas co-expression of TAG-1 with F3 blocks this inhibitory effect. F3 co-immunoprecipitates with TAG-1 from Triton X-100-insoluble microdomains from newborn brain, and co-clustering of F3 and TAG-1 occurs in double-transfected CHO cells, indicating they associate in a multimolecular complex in lipid rafts to modulate axonal growth.\",\n      \"method\": \"CHO cell transfection co-culture assay with granule cells, microsphere binding, antibody-mediated cross-linking, co-immunoprecipitation from brain\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional assay, co-IP from brain, co-clustering in transfected cells; 60 citations\",\n      \"pmids\": [\"9712656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Tenascin-R (TN-R) and its neuronal receptor F3 (CNTN1) promote neurite defasciculation in cerebellar explant cultures. Perturbation of this interaction by antibodies or antisense oligonucleotides increases fasciculation. The relevant domains are the N-terminal region of TN-R (containing cysteine-rich stretch and EGF-like repeats) and the Ig-like domains of F3. Defasciculation can be blocked by a protein kinase C inhibitor and reversed by a phorbol ester, implicating PKC signaling downstream.\",\n      \"method\": \"Cerebellar explant cultures, antibody and antisense oligonucleotide perturbation, domain mapping with recombinant proteins, pharmacological inhibition of PKC\",\n      \"journal\": \"Journal of neuroscience research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional explant assay, antibody and antisense perturbation, domain identification, pharmacological pathway dissection; 50 citations\",\n      \"pmids\": [\"9589384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"F3/contactin (CNTN1) is localized in secretory granules in all compartments of oxytocin/vasopressin (HNS) neurons and is co-released by exocytosis at axon terminals in the neurohypophysis upon physiological stimulation (lactation, osmotic challenge). Surface expression is upregulated by stimulation and is restricted to axons; F3 mRNA increases more than threefold upon stimulation, following a regulated secretory pathway.\",\n      \"method\": \"Immunocytochemistry, immunoblot, in situ hybridization, confocal/electron microscopy, sucrose density gradient fractionation\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple imaging and biochemical methods establishing regulated secretory localization\",\n      \"pmids\": [\"9651216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"NrCAM is identified as the functional receptor on cerebellar granule cell growth cones that mediates the inhibitory effect of F3 (CNTN1) on axonal elongation: F3Fc-conjugated microspheres bind to growth cones via heterophilic interaction with NrCAM but not L1. Time-lapse video microscopy shows F3Fc beads move retrogradely from the leading edge to the base of the growth cone at ~5.7 µm/min, consistent with coupling to retrograde actin flow; cytochalasin B disrupts this movement. Retrograde mobility requires NrCAM clustering.\",\n      \"method\": \"Microsphere binding assay, time-lapse video microscopy, cytochalasin B pharmacology, cross-linked vs. dimeric F3Fc chimera comparison\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — live imaging, pharmacological dissection, functional receptor identification; 40 citations\",\n      \"pmids\": [\"10462518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"F3 (CNTN1) Ig domains interact with Caspr/paranodin (a transmembrane neurexin superfamily protein), and this association is required for surface transport of Caspr. Co-transfection of F3 with Caspr in CHO or neuroblastoma cells results in plasma membrane delivery of Caspr (not achieved by Caspr alone). F3's GPI anchor and FNIII repeats cooperate to recruit Caspr into Triton X-100-insoluble lipid raft microdomains, enabling its plasma membrane targeting; a truncated F3 lacking FNIII repeats fails to recruit Caspr to rafts or the cell surface.\",\n      \"method\": \"Co-transfection in CHO/neuroblastoma cells, confocal microscopy, cell surface biotinylation, co-immunoprecipitation domain mapping, Triton X-100 fractionation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, domain mapping, functional consequence of association; 111 citations\",\n      \"pmids\": [\"10769038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"F3/contactin (CNTN1) participates in bidirectional neuron-glia signaling: F3 Ig domains bind tenascin-R, tenascin-C, and isoforms of the proteoglycan-type protein tyrosine phosphatase RPTPz/beta expressed by glia. Preclustered F3IgFc specifically modifies distribution and intensity of phosphotyrosine labeling in glial C6 cells. Inhibition of tenascin-R/F3 interaction prevents defasciculation of cerebellar explants. F3IgFc binds strongly to astrocytes and C6 astrocytoma cells.\",\n      \"method\": \"F3IgFc chimera binding to primary cultures and astrocytoma cells, fluorosphere binding, brain extract pull-down, cerebellar explant cultures, phosphotyrosine immunostaining\",\n      \"journal\": \"Advances in experimental medicine and biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional assays and binding studies, but review/proceedings format limits primary data assessment\",\n      \"pmids\": [\"10635039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"F3/contactin (CNTN1) surface expression in hypothalamic oxytocin neurons is polarized to axons and is mobilized to the axonal surface via the activity-dependent regulated secretory pathway. Re-expression after GPI-PLC removal is accelerated by K+ depolarization or bicuculline (GABA-A blockade) and inhibited by Mn2+ (Ca2+ channel block), tetrodotoxin (Na+ channel block), or glutamate antagonists, demonstrating that externalization depends on Ca2+ entry and electrical activity.\",\n      \"method\": \"GPI-PLC treatment of live organotypic slice cultures, immunocytochemistry of live vs. fixed cells, K+ depolarization, pharmacological inhibition\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct live-cell imaging and pharmacological dissection of activity-dependent surface mobilization\",\n      \"pmids\": [\"11556889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Contactin (CNTN1) associates with voltage-gated Na+ channel Nav1.2 alpha subunits and the beta1 subunit in brain. Co-transfection of contactin with Nav1.2alpha and beta1 in cells increases peak Na+ currents 3–4 fold and increases Na+ channel surface membrane density (confirmed by saxitoxin binding). Contactin interacts specifically with the beta1 subunit (not beta2) by co-immunoprecipitation from cell lines. In the CNS, contactin and Na+ channels colocalize at nodes of Ranvier during development and in adults.\",\n      \"method\": \"Co-immunoprecipitation from brain homogenates and transfected cells, electrophysiology, saxitoxin binding, immunocytochemistry of developing and adult nodes\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — electrophysiological functional readout, co-IP from native tissue, saxitoxin binding; 152 citations\",\n      \"pmids\": [\"11567041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"F3/contactin (CNTN1) acts as a functional ligand for Notch receptors on oligodendrocyte precursor cells. This trans-extracellular interaction triggers gamma-secretase-dependent nuclear translocation of the Notch intracellular domain (NICD). F3/Notch signaling promotes oligodendrocyte precursor cell differentiation and upregulates MAG in OLN-93 cells. This signaling is blocked by dominant-negative Notch1/Notch2 or Deltex1 mutants lacking RING-H2, but not by dominant-negative RBP-J or Hes1 antisense, establishing a non-canonical Notch/Deltex1 pathway distinct from Jagged/Notch canonical signaling.\",\n      \"method\": \"Cell co-culture, NICD nuclear translocation assays, MAG expression by western blot, dominant-negative constructs, gamma-secretase inhibition\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple dominant-negative and inhibitor experiments, functional differentiation readout; 305 citations\",\n      \"pmids\": [\"14567914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Caspr regulates the processing and surface transport of contactin (CNTN1): co-expression of Caspr with contactin produces a low molecular weight (LMw), endoglycosidase H-sensitive isoform of contactin at the cell membrane that remains associated with Caspr but is unable to bind neurofascin-155 (NF155). Conversely, NF155 binds directly to contactin when Caspr is absent. Deletion of Caspr in mice shifts contactin from the LMw to a HMw glycoform, confirming that Caspr regulates contactin's intracellular processing and transport, thereby gating its ability to interact with other CAMs.\",\n      \"method\": \"Co-immunoprecipitation, EndoH glycosylation analysis, transfection in heterologous cells, Caspr knockout mice\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — biochemical glycoform analysis, co-IP, knockout mouse validation; 124 citations\",\n      \"pmids\": [\"14676309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Sodium channel beta1 subunit-mediated modulation of Nav1.2 and increase in cell surface density requires interaction with both contactin (CNTN1) and ankyrin. A beta1Y181E mutant that cannot interact with ankyrinG fails to modulate Nav1.2 channel function even though it associates with Nav1.2 and contactin. The contactin interaction site was mapped to two regions of the beta1 Ig loop using beta1/beta2 chimeras.\",\n      \"method\": \"beta1/beta2 chimera construction, electrophysiology, co-immunoprecipitation, cell surface expression measurement\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — site-directed mutagenesis, chimera analysis, electrophysiology, co-IP; 100 citations\",\n      \"pmids\": [\"14761957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Contactin-null (contactin-/-) mice display severe ataxia and survive only until postnatal day 18. Cerebellar analysis reveals defects in granule cell axon guidance and in dendritic projections from granule and Golgi cells, demonstrating that contactin (CNTN1) controls axonal and dendritic interactions of cerebellar interneurons and is required for cerebellar microorganization in vivo.\",\n      \"method\": \"Gene knockout in mice (homologous recombination), behavioral assessment, histological and morphological analysis of cerebellum\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cerebellar phenotype; 190 citations\",\n      \"pmids\": [\"10595523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Premature expression of F3/contactin (CNTN1) under TAG-1 regulatory sequences in transgenic mice causes a transient reduction in cerebellar size due to decreased granule cell proliferation (at P3) followed by increased cycling (at P8–P11), and failure of Purkinje cell dendritic elaboration. This demonstrates that precise spatiotemporal regulation of CNTN1 expression is critical for granule cell proliferation, differentiation, and Purkinje cell development.\",\n      \"method\": \"Transgenic mouse generation (TAG/F3), histological analysis, BrdU proliferation assays, cerebellar morphometry\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — defined transgenic model with quantitative cellular phenotypes\",\n      \"pmids\": [\"12441289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Cntn1 (F3/contactin) is duplicated in teleost fish (goldfish, zebrafish, fugu), resulting in Cntn1a and Cntn1b paralogs that show subfunctionalization. In adult goldfish, Cntn1b is expressed in oligodendrocytes and is upregulated in retinal ganglion cells after optic nerve transection, suggesting a role in axonal regeneration in addition to development.\",\n      \"method\": \"Gene cloning, phylogenetic analysis, in situ hybridization during development, optic nerve transection model with subsequent expression analysis\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — expression and cloning study with functional inference from regeneration model\",\n      \"pmids\": [\"15691716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"F3/contactin (CNTN1) interacts with Notch receptors and promotes oligodendrocyte development through a Deltex1-dependent, non-canonical Notch pathway. NB-3, another contactin family member, similarly interacts with Notch via Deltex1. This F3/Notch/Deltex1 signaling cascade promotes generation and maturation of oligodendrocyte precursor cells, distinct from the canonical Jagged1/Notch pathway which inhibits further differentiation.\",\n      \"method\": \"Cell co-culture assays, dominant-negative constructs, animal model analysis\",\n      \"journal\": \"Developmental neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — review summarizing previously published mechanistic work, limited new primary data\",\n      \"pmids\": [\"16508301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CNTN1 promotes prostate cancer metastasis: CNTN1 knockdown reduces prostate cancer stem-like cell (PCSC)-mediated tumor initiation, whereas CNTN1 overexpression enhances invasion in vitro and promotes xenograft tumor formation and lung metastasis in vivo. CNTN1 overexpression results in elevated AKT activation and reduced E-cadherin expression in DU145 cells and corresponding xenografts, placing CNTN1 upstream of AKT signaling and EMT.\",\n      \"method\": \"shRNA knockdown, overexpression in DU145 cells, xenograft mouse models, in vitro invasion assays, western blotting for AKT phosphorylation and E-cadherin\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KD and OE with defined molecular and in vivo phenotypes, pathway placement via AKT and E-cadherin\",\n      \"pmids\": [\"26795349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"VEGF-C upregulates CNTN1 expression in esophageal cancer cells, and CNTN1 mediates VEGF-C's pro-tumorigenic effects on cell proliferation and migration. Silencing of CNTN1 reverses the increased proliferation and migration induced by VEGF-C overexpression, indicating CNTN1 acts downstream of VEGF-C signaling in esophageal cancer progression.\",\n      \"method\": \"VEGF-C overexpression and shRNA knockdown in TE-1 and Eca-109 cells, CNTN1 siRNA rescue, cell proliferation and migration assays, nude mouse xenografts\",\n      \"journal\": \"Cytokine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional knockdown and rescue experiments but no direct biochemical pathway mapping\",\n      \"pmids\": [\"21482472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Contactin-1/F3 (Cntn1) is required for neuronal migration during cortical development. shRNA-mediated knockdown of Cntn1 in neural stem cells via in utero electroporation delays neuronal migration and causes abnormal leading process morphology with more multipolar cells in deep cortical layers. Cntn1 KD upregulates RhoA, and expression of dominant-negative RhoAN19 partially rescues the migration defects, placing Cntn1 upstream of RhoA as a negative regulator of this GTPase during cortical neuronal migration.\",\n      \"method\": \"In utero electroporation with shRNA, immunohistochemistry, dominant-negative RhoA rescue experiment\",\n      \"journal\": \"Frontiers in molecular neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KD, genetic epistasis via dominant-negative rescue, defined molecular pathway\",\n      \"pmids\": [\"30515076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Anti-contactin-1 (CNTN1) IgG3 autoantibodies induce acute conduction block and motor deficits in rats via complement deposition at paranodal regions, without inflammatory infiltrates or dispersion of paranodal proteins. Intraneural injection of IgG3-predominant patient IgG caused conduction blocks in 83% of animals and paranodal complement deposition, whereas chronic-phase IgG4-predominant patient IgG caused less frequent and less severe effects, indicating IgG3 anti-CNTN1 mediates acute paranodopathy via complement.\",\n      \"method\": \"Passive transfer of patient IgG to Lewis rats, nerve conduction studies, immunohistochemistry for complement, motor function testing\",\n      \"journal\": \"Journal of neuroinflammation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo passive transfer model with electrophysiological and immunohistochemical readouts\",\n      \"pmids\": [\"30953561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CNTN1 promotes docetaxel resistance and epithelial-to-mesenchymal transition (EMT) in prostate cancer via the PI3K/Akt signaling pathway. Knockdown of CNTN1 in docetaxel-resistant PC3 and DU145 cells attenuates proliferation, migration, invasion, EMT phenotype, and drug resistance, and decreases PI3K/Akt activity both in vitro and in vivo (xenograft model).\",\n      \"method\": \"shRNA knockdown in drug-resistant cell lines, CCK-8 proliferation assay, flow cytometry, wound-healing, transwell invasion, western blotting, xenograft mouse model\",\n      \"journal\": \"Archives of medical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — KD with pathway marker analysis in vitro and in vivo, but no direct mechanistic link established between CNTN1 and PI3K\",\n      \"pmids\": [\"33488868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"F3/contactin promotes adult hippocampal neurogenesis, synaptic plasticity, and memory in mice: TAG/F3 transgenic mice overexpressing CNTN1 show increased hippocampal size, enhanced precursor proliferation, increased CA1 long-term potentiation, and improved spatial and object recognition memory. These effects correlate with increased phosphorylated CREB expression, suggesting CNTN1 overexpression activates the CREB signaling pathway to promote neurogenesis and synaptic plasticity.\",\n      \"method\": \"Transgenic mouse model (TAG/F3), BrdU/NeuN proliferation assays, LTP electrophysiology, behavioral memory tests, western blotting for pCREB\",\n      \"journal\": \"Hippocampus\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transgenic model with multiple functional readouts, but CREB pathway link is correlative\",\n      \"pmids\": [\"23939883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cntn1 expression is upregulated in the hippocampus (but not medial prefrontal cortex) in response to chronic unpredictable stress (CUS) in rodents. Adeno-associated virus-mediated overexpression of Cntn1 in the hippocampus triggers anxiety- and depression-like phenotypes, activates microglia, upregulates pro-inflammatory cytokines (IL1α, IL6, Ccl2), downregulates anti-inflammatory cytokines (IL4, CD206), and impairs hippocampal immature neurons (decreased doublecortin+ cells).\",\n      \"method\": \"Chronic unpredictable stress model, AAV stereotactic injection for Cntn1 overexpression, real-time qPCR for cytokines, immunohistochemistry for doublecortin\",\n      \"journal\": \"Brain, behavior, and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — AAV-mediated overexpression with defined behavioral and cellular phenotypes, mechanistic link to neuroinflammation\",\n      \"pmids\": [\"33737174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Hippocampal F3/Contactin (CNTN1) is implicated in depression: chronic restraint stress and chronic social defeat stress decrease hippocampal CNTN1 expression. AAV-mediated overexpression of hippocampal CNTN1 prevents stress-induced depressive-like behaviors and reverses dysfunction of the hippocampal BDNF-CREB signaling cascade and neurogenesis impairment. Conversely, AAV-mediated knockdown of hippocampal CNTN1 abolishes the antidepressant effects of vortioxetine.\",\n      \"method\": \"Chronic stress mouse models, AAV-mediated overexpression and knockdown, western blotting, immunofluorescence for neurogenesis markers, behavioral tests\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional genetic manipulation with behavioral and molecular readouts, pathway placement via BDNF-CREB\",\n      \"pmids\": [\"35609645\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Hippocampal CNTN1 overexpression triggers cognitive deficits by boosting crosstalk between microglia and astrocytes. CNTN1 overexpression activates microglia, which triggers astrocyte activation with aberrant upregulation of excitatory amino acid transporters EAAT1/EAAT2, leading to LTP impairment. Minocycline (microglial activation inhibitor) reverses LTP impairment caused by CNTN1 overexpression, establishing that CNTN1-driven microglial activation is mechanistically upstream of astrocyte dysfunction and LTP deficits.\",\n      \"method\": \"AAV stereotactic injection for CNTN1 overexpression, LTP electrophysiology, immunohistochemistry for microglia/astrocyte markers, EAAT1/2 western blotting, minocycline pharmacological rescue, behavioral cognitive tests\",\n      \"journal\": \"Aging and disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional genetic and pharmacological dissection with defined cellular and electrophysiological phenotypes\",\n      \"pmids\": [\"37196127\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Clemastine preferentially promotes F3/Contactin-1 (CNTN1)-mediated non-canonical Notch-1/Deltex-1 signaling over canonical Jagged-1/Notch-1 signaling during remyelination. In the EAE rat model, CLM restores CNTN1 levels, elevates Deltex-1 gene expression, and reduces HES1/5 (canonical Notch targets), correlating with enhanced oligodendrocyte differentiation and myelination markers (MBP, CNPase, PLP, ASPA). F3/CNTN1-mediated non-canonical Notch signaling is proposed as the mechanism underlying clemastine's remyelinating effect.\",\n      \"method\": \"EAE rat model, pharmacological clemastine treatment, behavioral tests (rotarod, open-field, grip), Luxol fast blue histology, immunohistochemistry, gene expression analysis\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — pharmacological model with correlative pathway analysis; no direct CNTN1 manipulation to establish causality\",\n      \"pmids\": [\"38232534\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CNTN1 (F3/contactin) is a GPI-anchored, six Ig-domain plus four FNIII-repeat cell adhesion molecule that operates as a multifunctional signaling hub: it localizes to lipid raft microdomains where it physically associates with fyn kinase (via FNIII repeats) and L1 to transduce tyrosine phosphorylation signals; it serves as a neuronal receptor for RPTPβ (via its Ig domains) and as a functional Notch ligand on oligodendrocyte precursors (triggering non-canonical Notch/Deltex1 signaling and myelination); it forms a ternary complex with Caspr (which it chaperones to the plasma membrane via lipid rafts) and NrCAM at paranodal axoglial junctions; it increases voltage-gated Na+ channel (Nav1.2) surface density through interaction with the beta1 subunit; it regulates cortical neuronal migration by suppressing RhoA activity; and in cancer contexts it activates AKT signaling and suppresses E-cadherin to promote invasion and chemoresistance, while in the hippocampus it modulates BDNF-CREB signaling, adult neurogenesis, and microglial-astrocytic crosstalk affecting synaptic plasticity and cognition.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CNTN1 (F3/contactin) is a GPI-anchored immunoglobulin superfamily cell adhesion molecule that orchestrates axon guidance, fasciculation, myelination, and synaptic plasticity in the developing and adult nervous system. It contains six C2-type Ig domains and four fibronectin type III (FNIII) repeats; the Ig domains mediate heterophilic binding to partners including tenascin-R/C, NrCAM, and paranodin/Caspr, while the FNIII repeats recruit Fyn tyrosine kinase for intracellular signal transduction and are required for targeting associated proteins into lipid raft microdomains [PMID:2474555, PMID:8907714, PMID:10769038]. CNTN1 is essential for surface delivery of paranodin/Caspr to paranodal junctions, regulates radial cortical migration by suppressing RhoA, promotes adult hippocampal neurogenesis and LTP through BDNF–CREB signaling, and engages non-canonical Notch/Deltex1 signaling to drive oligodendrocyte differentiation [PMID:10769038, PMID:30515076, PMID:23939883, PMID:16508301]. IgG3 autoantibodies against CNTN1 cause acute nerve conduction block through paranodal complement deposition, linking CNTN1 to autoimmune neuropathy [PMID:30953561].\",\n  \"teleology\": [\n    {\n      \"year\": 1989,\n      \"claim\": \"Establishing the molecular identity of contactin resolved how a GPI-anchored Ig-superfamily member could serve as a neuronal surface adhesion molecule, setting the foundation for all subsequent functional studies.\",\n      \"evidence\": \"cDNA cloning, PI-PLC treatment, immunofluorescence, and sequence analysis of mouse F3/contactin\",\n      \"pmids\": [\"2474555\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No functional assays performed\", \"Binding partners not yet identified\", \"Human ortholog not yet cloned\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Demonstrating that F3/contactin mediates neuronal repulsion by tenascin-C (J1-160/180) established the first heterophilic ligand interaction and showed that contactin could transduce repulsive as well as adhesive signals.\",\n      \"evidence\": \"Cell adhesion and neurite outgrowth assays using F3-transfected CHO cells and antibody blocking on cerebellar neurons\",\n      \"pmids\": [\"7678967\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling mechanism unknown\", \"Whether other tenascin family members also bind F3 not tested\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Identifying Fyn kinase as a signaling partner recruited via the FNIII repeats resolved how a GPI-anchored protein lacking a cytoplasmic domain could activate intracellular signaling during cell aggregation.\",\n      \"evidence\": \"Co-immunoprecipitation, in vitro kinase assay, and FNIII deletion mutants in transfected cells and native brain tissue\",\n      \"pmids\": [\"8907714\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transmembrane co-receptor mediating Fyn association not identified\", \"Downstream substrates of Fyn in this context unknown\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Showing that oligodendrocytes express GPI-anchored F3/contactin expanded the functional scope beyond neurons and implicated contactin in myelination.\",\n      \"evidence\": \"Biosynthetic labeling, 2D gel electrophoresis, immunofluorescence double-staining, and PI-PLC treatment in oligodendrocyte cultures\",\n      \"pmids\": [\"9063727\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role in oligodendrocyte biology not directly tested\", \"Whether oligodendroglial F3 has the same partners as neuronal F3 unknown\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Mapping the tenascin-R interaction to F3 Ig domains and showing that PKC signaling modulates fasciculation provided the first domain-level understanding of how contactin regulates axon bundle organization.\",\n      \"evidence\": \"Cerebellar explant cultures with antibody blocking, antisense oligonucleotides, and PKC pharmacology\",\n      \"pmids\": [\"9589384\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct PKC substrates not identified\", \"Whether tenascin-R and tenascin-C compete for same F3 domains unknown\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Discovering that F3 and TAG-1 associate in lipid rafts and that TAG-1 co-expression reverses F3-mediated neurite inhibition revealed a cis-modulatory mechanism for tuning contactin signaling output.\",\n      \"evidence\": \"Co-IP from brain lipid raft fractions, neurite outgrowth on CHO monolayers, and cross-linking co-clustering in transfected cells\",\n      \"pmids\": [\"9712656\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of F3–TAG-1 complex unknown\", \"Whether TAG-1 alters F3 binding to trans ligands not tested\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Identifying NrCAM as the growth cone receptor that couples F3 binding to actin retrograde flow explained the cytoskeletal basis of contactin-mediated axonal growth inhibition.\",\n      \"evidence\": \"F3Fc microsphere binding, live time-lapse video-microscopy, and cytochalasin B perturbation on cerebellar growth cones\",\n      \"pmids\": [\"10462518\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Adaptor linking NrCAM to actin not identified\", \"Whether this mechanism operates in vivo not tested\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstrating that F3/contactin is required for surface transport of paranodin/Caspr and their joint recruitment into lipid rafts established contactin's essential role in paranodal junction assembly.\",\n      \"evidence\": \"Co-transfection in CHO and neuroblastoma cells with surface biotinylation, co-IP, and Triton-insoluble microdomain fractionation using domain deletion constructs\",\n      \"pmids\": [\"10769038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo paranodal phenotype in contactin knockout not yet shown in this study\", \"Whether lipid raft targeting is sufficient for functional paranodal septae unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showing that premature F3 expression reduces granule cell number and Purkinje cell dendrite elaboration demonstrated that precise spatiotemporal control of contactin levels is critical for cerebellar morphogenesis.\",\n      \"evidence\": \"TAG/F3 transgenic mice with BrdU proliferation assay and histological analysis\",\n      \"pmids\": [\"12441289\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether reduced proliferation is cell-autonomous not resolved\", \"Downstream signaling pathway mediating the morphogenetic defect not identified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Linking F3/contactin to non-canonical Notch signaling via Deltex1 provided a molecular pathway for how contactin promotes oligodendrocyte differentiation at the axoglial interface.\",\n      \"evidence\": \"EAE rat model with pharmacological treatment, immunostaining, and gene expression analysis for Deltex-1, Hes1/5\",\n      \"pmids\": [\"16508301\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct F3–Notch binding not biochemically demonstrated in this study\", \"Whether Deltex1 pathway operates independently of canonical Notch ligands in vivo not fully resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrating that contactin overexpression enhances adult hippocampal neurogenesis, LTP, and memory through phospho-CREB expanded contactin's role from developmental adhesion to adult synaptic plasticity.\",\n      \"evidence\": \"TAG/F3 transgenic mice with BrdU/NeuN immunostaining, LTP electrophysiology, behavioral memory tasks, and p-CREB Western blotting\",\n      \"pmids\": [\"23939883\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CREB activation is direct or secondary to enhanced LTP unclear\", \"Loss-of-function counterpart not shown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identifying RhoA suppression as the downstream mechanism by which contactin promotes radial cortical migration resolved a key signaling axis linking this adhesion molecule to cytoskeletal remodeling in migrating neurons.\",\n      \"evidence\": \"In utero electroporation of shRNA with in vivo cortical migration analysis and dominant-negative RhoA rescue\",\n      \"pmids\": [\"30515076\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How contactin suppresses RhoA (intermediary GEF/GAP) unknown\", \"Whether this RhoA mechanism also operates in cerebellar migration not tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Passive transfer of anti-CNTN1 IgG3 autoantibodies causing acute conduction block via paranodal complement deposition established a direct pathogenic mechanism for autoimmune neuropathy targeting contactin.\",\n      \"evidence\": \"Intraneural injection of patient-derived IgG3 and IgG4 in Lewis rats with nerve conduction studies, behavioral testing, and complement immunofluorescence\",\n      \"pmids\": [\"30953561\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Long-term demyelination not observed in this acute model\", \"Whether IgG4 causes chronic paranodal disorganization not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Bidirectional manipulation showing that hippocampal contactin overexpression prevents stress-induced depression while knockdown abolishes antidepressant efficacy positioned contactin as a necessary mediator of BDNF–CREB-dependent antidepressant action.\",\n      \"evidence\": \"AAV overexpression and knockdown in mice with chronic stress models and vortioxetine pharmacological epistasis\",\n      \"pmids\": [\"35609645\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular link between contactin and BDNF transcription not established\", \"Whether contactin acts cell-autonomously in neurons or via glia not dissected\", \"Single laboratory finding\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrating that supraphysiological contactin triggers microglial activation, disrupts glutamate transporter expression, and impairs LTP—all rescued by minocycline—established glial activation as the causal intermediary linking contactin excess to cognitive deficits.\",\n      \"evidence\": \"AAV-mediated hippocampal CNTN1 overexpression with behavioral testing, immunohistochemistry, LTP electrophysiology, and minocycline pharmacological rescue\",\n      \"pmids\": [\"37196127\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether contactin directly activates microglial receptors or acts indirectly unknown\", \"Dose-response relationship between physiological and supraphysiological contactin levels not characterized\", \"Single laboratory finding\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The transmembrane co-receptor that couples GPI-anchored contactin to intracellular Fyn kinase, the molecular mechanism by which contactin suppresses RhoA during cortical migration, and the receptor on microglia that senses contactin excess remain unidentified.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Transmembrane adaptor for Fyn coupling not identified\", \"RhoA-regulatory intermediates (GEF/GAP) downstream of contactin unknown\", \"Microglial receptor for contactin not identified\", \"Structural basis of contactin–Notch interaction lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 1, 6, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 9, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2, 9, 10]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [7, 16]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [12, 15]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 11, 21]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [8, 13]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [16]}\n    ],\n    \"complexes\": [\n      \"Contactin-1/Caspr paranodal complex\",\n      \"F3/TAG-1 lipid raft complex\"\n    ],\n    \"partners\": [\n      \"CASPR\",\n      \"NRCAM\",\n      \"TAG1\",\n      \"FYN\",\n      \"TNC\",\n      \"TNR\",\n      \"NOTCH1\",\n      \"DTX1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"CNTN1 (contactin-1/F3) is a GPI-anchored immunoglobulin superfamily cell adhesion molecule with six Ig-like domains and four fibronectin type III repeats that functions as a multivalent signaling hub in neural development, myelination, and synaptic plasticity [PMID:2474555, PMID:7959734]. Through its Ig domains it engages extracellular ligands including RPTPβ, tenascin-R/C, Caspr, and Notch receptors, while its FNIII repeats recruit the Src-family kinase Fyn and chaperone Caspr to lipid-raft microdomains for surface delivery and paranodal junction assembly [PMID:7628014, PMID:8907714, PMID:10769038, PMID:7595520]. CNTN1 acts as a non-canonical Notch ligand on oligodendrocyte precursors, triggering Deltex1-dependent signaling that promotes oligodendrocyte differentiation and myelination, and it increases neuronal Nav1.2 surface density via the β1 subunit at nodes of Ranvier [PMID:14567914, PMID:11567041]. In vivo, CNTN1 is required for cerebellar granule cell axon guidance, cortical neuronal migration through suppression of RhoA, and hippocampal neurogenesis and synaptic plasticity via BDNF–CREB signaling and microglia–astrocyte crosstalk [PMID:10595523, PMID:30515076, PMID:37196127, PMID:35609645].\",\n  \"teleology\": [\n    {\n      \"year\": 1989,\n      \"claim\": \"Establishing that CNTN1 is a GPI-anchored Ig-superfamily member on neuronal surfaces resolved its structural class and membrane attachment mode, foundational for all subsequent interaction studies.\",\n      \"evidence\": \"cDNA cloning, sequence analysis, immunocytochemistry, and subcellular fractionation of mouse brain\",\n      \"pmids\": [\"2474555\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No functional role demonstrated\", \"No interacting partners identified\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Identifying RPTPβ as an extracellular ligand for CNTN1 and demonstrating that CNTN1 resides in lipid rafts in complex with Fyn and L1 established CNTN1 as a signal-transducing receptor despite lacking a transmembrane domain.\",\n      \"evidence\": \"Expression cloning, neurite outgrowth assays with antibody blocking (RPTPβ), co-IP from cerebellum with detergent-resistant membrane fractionation (Fyn/L1)\",\n      \"pmids\": [\"7628014\", \"7595520\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling cascades beyond Fyn phosphorylation undefined\", \"Structural basis of RPTPβ–CNTN1 interaction unknown\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Mapping signal transduction to the FNIII repeats of CNTN1 resolved how a GPI-anchored protein without an intracellular domain can activate tyrosine kinase signaling — through domain-specific association with Fyn kinase.\",\n      \"evidence\": \"Truncation mutants in CHO cells, metabolic 32P labeling, co-IP with Fyn from cerebellum\",\n      \"pmids\": [\"8907714\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of downstream substrates of Fyn activated by CNTN1 unknown\", \"Whether FNIII–Fyn interaction is direct or via an adaptor not resolved\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrating that CNTN1 Ig domains interact with tenascin-R to promote neurite defasciculation via PKC signaling, and that TAG-1 modulates CNTN1 effects in lipid rafts, revealed CNTN1 as a context-dependent regulator of axon fasciculation.\",\n      \"evidence\": \"Cerebellar explant cultures, antibody/antisense perturbation, pharmacological PKC inhibition; CHO co-transfection and co-IP from brain for TAG-1\",\n      \"pmids\": [\"9589384\", \"9712656\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PKC isoform specificity not determined\", \"Stoichiometry and dynamics of the CNTN1–TAG-1 raft complex undefined\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"The contactin-null mouse phenotype — lethal ataxia with granule cell axon guidance defects — proved that CNTN1 is essential for cerebellar circuit formation in vivo, moving beyond cell-culture studies.\",\n      \"evidence\": \"Gene knockout by homologous recombination, histological analysis of cerebellum, behavioral assessment\",\n      \"pmids\": [\"10595523\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular pathways disrupted in vivo not identified\", \"Contribution of individual CNTN1 interactions to cerebellar phenotype unresolved\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Discovering that CNTN1 chaperones Caspr to the plasma membrane via lipid-raft recruitment through its FNIII repeats explained how the Caspr–CNTN1 complex assembles at paranodal junctions.\",\n      \"evidence\": \"Co-transfection in CHO/neuroblastoma cells, surface biotinylation, Triton X-100 fractionation, domain-deletion mapping\",\n      \"pmids\": [\"10769038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional factors stabilize the complex at paranodes not tested\", \"Mechanism by which GPI anchor plus FNIII domains recruit Caspr to rafts structurally unresolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Showing that CNTN1 increases Nav1.2 surface density through specific interaction with the β1 subunit at nodes of Ranvier established a direct role in sodium channel clustering and saltatory conduction.\",\n      \"evidence\": \"Co-IP from brain, electrophysiology showing 3–4-fold current increase, saxitoxin binding, co-localization at nodes\",\n      \"pmids\": [\"11567041\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CNTN1 is required for Nav channel clustering in vivo not tested with knockout\", \"Interplay between CNTN1–β1 and ankyrin-dependent clustering incompletely dissected\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identifying CNTN1 as a non-canonical Notch ligand that triggers Deltex1-dependent, RBP-J-independent signaling to promote oligodendrocyte differentiation revealed a novel myelination pathway distinct from canonical Notch signaling.\",\n      \"evidence\": \"Cell co-culture with NICD translocation assays, MAG induction, dominant-negative Notch/Deltex1/RBP-J constructs, gamma-secretase inhibition\",\n      \"pmids\": [\"14567914\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo requirement for CNTN1–Notch in myelination not demonstrated by conditional knockout\", \"Structural basis for CNTN1–Notch interaction unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrating that Caspr regulates CNTN1 glycoform processing and gates its ability to bind NF155 revealed bidirectional regulation within the paranodal complex — CNTN1 delivers Caspr to the surface, but Caspr reciprocally controls CNTN1's binding repertoire.\",\n      \"evidence\": \"Co-IP, EndoH glycosylation analysis, Caspr knockout mouse glycoform shift\",\n      \"pmids\": [\"14676309\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of altered glycoform for paranodal integrity not fully tested\", \"Whether glycoform regulation occurs in all neuronal subtypes unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placing CNTN1 upstream of PI3K/AKT activation and E-cadherin suppression in prostate cancer extended its role beyond neural contexts and identified it as a driver of invasion and chemoresistance via EMT.\",\n      \"evidence\": \"shRNA knockdown and overexpression in DU145 cells, xenograft models, western blotting for pAKT and E-cadherin\",\n      \"pmids\": [\"26795349\", \"33488868\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical mechanism linking CNTN1 to PI3K activation not identified\", \"Whether GPI-anchored CNTN1 signals through the same raft/Fyn mechanism in cancer cells unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrating that CNTN1 knockdown impairs cortical neuronal migration and upregulates RhoA — rescued by dominant-negative RhoA — established CNTN1 as a negative regulator of RhoA during corticogenesis, adding a migration role beyond axon guidance.\",\n      \"evidence\": \"In utero electroporation with shRNA, dominant-negative RhoAN19 rescue, immunohistochemistry\",\n      \"pmids\": [\"30515076\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which GPI-anchored CNTN1 suppresses RhoA activity not identified\", \"Whether this pathway operates in adult neuronal migration unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Passive transfer of anti-CNTN1 IgG3 autoantibodies causing complement-dependent paranodal conduction block in rats established CNTN1 as a pathogenic autoantibody target in inflammatory neuropathy.\",\n      \"evidence\": \"Passive transfer to Lewis rats, nerve conduction studies, paranodal complement immunohistochemistry\",\n      \"pmids\": [\"30953561\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether complement fixation directly disrupts CNTN1–Caspr complex or causes broader paranodal damage unresolved\", \"Human in vivo validation of IgG subclass-specific pathogenicity limited\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Bidirectional AAV manipulation in the hippocampus showed that CNTN1 modulates depressive-like behavior through the BDNF–CREB signaling cascade and neurogenesis, extending its role to adult affective circuits.\",\n      \"evidence\": \"AAV-mediated overexpression and knockdown in hippocampus, chronic stress models, western blotting for BDNF/pCREB, behavioral assays\",\n      \"pmids\": [\"35609645\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular link between CNTN1 and BDNF expression not established\", \"Cell-type specificity of CNTN1 action in hippocampus not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identifying microglia–astrocyte crosstalk as the downstream effector of hippocampal CNTN1 overexpression — with aberrant EAAT1/2 upregulation impairing LTP — revealed a non-cell-autonomous mechanism linking CNTN1 to cognitive dysfunction.\",\n      \"evidence\": \"AAV overexpression, LTP electrophysiology, minocycline pharmacological rescue, EAAT1/2 western blotting, microglia/astrocyte marker immunohistochemistry\",\n      \"pmids\": [\"37196127\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which neuronal CNTN1 activates microglia is unknown\", \"Whether CNTN1-mediated microglial activation involves direct cell contact or secreted factors not determined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of CNTN1's multi-ligand recognition, the mechanism by which a GPI-anchored protein activates intracellular pathways such as PI3K/AKT and RhoA suppression, in vivo conditional knockout validation of the CNTN1–Notch myelination pathway, and the cell-type-specific signaling logic that determines whether CNTN1 promotes or impairs neurogenesis and plasticity.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of full-length CNTN1 or its complexes\", \"No conditional knockout addressing myelination or hippocampal functions\", \"Mechanism coupling GPI-anchored CNTN1 to intracellular RhoA or AKT signaling undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 1, 4, 7, 9, 12, 15, 16]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [16, 22]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [4, 5, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2, 12, 14, 15]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [10, 14]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [4, 9, 15, 18, 19, 25, 31]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [19, 20, 25]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 16, 23, 27]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [1, 7, 11, 12, 17]}\n    ],\n    \"complexes\": [\n      \"Caspr-CNTN1-NrCAM paranodal complex\",\n      \"CNTN1-L1-Fyn lipid raft complex\",\n      \"CNTN1-Nav1.2-β1 nodal complex\"\n    ],\n    \"partners\": [\n      \"CNTNAP1\",\n      \"NRCAM\",\n      \"FYN\",\n      \"L1CAM\",\n      \"PTPRZ1\",\n      \"NOTCH1\",\n      \"SCN2A\",\n      \"SCN1B\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}