{"gene":"CNTN6","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":2004,"finding":"NB-3 (CNTN6) acts as a novel Notch1 ligand, triggering nuclear translocation of the Notch intracellular domain and promoting oligodendrogliogenesis from progenitor cells and differentiation of oligodendrocyte precursor cells via Deltex1; in primary oligodendrocytes, NB-3 increases myelin-associated glycoprotein transcripts.","method":"Cell-based reporter assays, primary oligodendrocyte cultures, nuclear translocation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple functional readouts in primary cells, replicated context with F3/contactin family, high citation count","pmids":["15082708"],"is_preprint":false},{"year":2003,"finding":"NB-3/CNTN6-deficient mice exhibit impaired motor coordination (rotorod, wire hang, horizontal rod-walking tests) without loss of grasp force, establishing NB-3 has a defined in vivo role in motor coordination, while brain architecture remains grossly normal.","method":"Knockout mouse generation (LacZ knock-in), behavioral testing","journal":"Journal of neurobiology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with specific behavioral phenotypic readout, high citation count","pmids":["12884264"],"is_preprint":false},{"year":2007,"finding":"NB-3 (CNTN6) directly associates with CHL1, enhances its cell surface expression, and both molecules interact with and regulate the activity of protein tyrosine phosphatase alpha (PTPα) to control apical dendrite orientation of deep-layer pyramidal neurons in the neocortex; PTPα-deficient mice phenocopy NB-3 and CHL1 deficiency with misoriented apical dendrites.","method":"Co-immunoprecipitation, NB-3 knockout mice, PTPα knockout mice, PTPα activity assays, immunohistochemistry","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, multiple knockout models, enzymatic activity assay, genetic epistasis","pmids":["18046458"],"is_preprint":false},{"year":2009,"finding":"NB-3/CNTN6 is localized presynaptically at glutamatergic synapses between parallel fibers and Purkinje cells in the cerebellum; NB-3 deficiency reduces parallel fiber synaptic terminal density and increases caspase-dependent cell death in the developing cerebellum, and increases L1 immunoreactivity in the IGL.","method":"Immunofluorescence with presynaptic/postsynaptic markers (VGLUT1, mGluR1α), NB-3 knockout mice, caspase activity assays","journal":"Developmental neurobiology","confidence":"High","confidence_rationale":"Tier 2 — direct localization with functional consequence, clean KO with defined phenotype","pmids":["19672956"],"is_preprint":false},{"year":2010,"finding":"NB-3/CNTN6 is required for glutamatergic (VGLUT1- and VGLUT2-positive) but not GABAergic synapse formation in the hippocampal formation during postnatal development; NB-3 knockout reduces VGLUT1/2 puncta density in regions of high NB-3 expression by ~20–30% without affecting VGAT puncta.","method":"NB-3 knockout mice, immunofluorescence with VGLUT1, VGLUT2, VGAT markers","journal":"Neuroscience letters","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with specific synaptic phenotype, single lab","pmids":["20176085"],"is_preprint":false},{"year":2011,"finding":"PTPα promotes cell surface expression of NB-3/CNTN6 by facilitating its Golgi exit and stabilizing it at the plasma membrane, preventing its release; the extracellular region of PTPα (not its catalytic activity) is required for this effect.","method":"COS1 cell co-expression, cortical neuron fractionation from PTPα KO mice, surface biotinylation, domain mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — mutagenesis of catalytic domain, multiple cell-biological assays, KO neurons","pmids":["21622556"],"is_preprint":false},{"year":2011,"finding":"NB-3/CNTN6 promotes neuronal survival and neurite outgrowth; NB-3 substrate supports neurons partially through homophilic binding mechanisms; NB-3 knockout mice develop larger infarct volumes after MCAO and NB-3-deficient neurons show increased susceptibility to oxygen-glucose deprivation.","method":"NB-3 KO mice, middle cerebral artery occlusion, primary neuron cultures on NB-3 substrate, in vitro oxygen-glucose deprivation","journal":"Stroke","confidence":"Medium","confidence_rationale":"Tier 2 — KO with defined phenotype plus in vitro substrate assay, single lab","pmids":["21817151"],"is_preprint":false},{"year":2012,"finding":"NB-3/CNTN6 is expressed in projecting corticospinal tract (CST) axons and its loss delays CST axon projection and terminal branching into spinal gray matter during development, without preventing eventual normal trajectory completion.","method":"NB-3 KO mice, CST axon tracing at multiple developmental stages, immunohistochemistry","journal":"The Journal of comparative neurology","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with direct axon-tracing phenotype, single lab","pmids":["21935948"],"is_preprint":false},{"year":2014,"finding":"Adropin interacts with NB-3/CNTN6 (identified by yeast two-hybrid screening), and this interaction promotes NB-3-induced Notch signaling activation and expression of Notch target genes; adropin knockout mice phenocopy NB-3 knockout mice with decreased locomotor activity, impaired motor coordination, and defective synapse formation.","method":"Yeast two-hybrid screening, adropin knockout mice, Notch target gene expression assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — yeast two-hybrid plus KO phenocopy, Notch signaling functional readout, high citation count","pmids":["25074942"],"is_preprint":false},{"year":2016,"finding":"CNTN6 variants (deletions and rare coding variants) are enriched in ASD individuals and are associated with hyperacusis and changes in auditory pathway wave latency, supporting a role for CNTN6 in sensory-motor neuronal connectivity and neurite outgrowth in auditory pathways.","method":"Clinical sequencing, electrophysiological auditory testing (ABR wave latency), cohort case-control analysis","journal":"Molecular psychiatry","confidence":"Medium","confidence_rationale":"Tier 3 — human variant association with direct electrophysiological functional readout, single cohort","pmids":["27166760"],"is_preprint":false},{"year":2018,"finding":"NB-3/CNTN6 is induced in both serotonergic raphespinal tract (sRST) axons and scar-forming cells after spinal cord injury; blocking NB-3 expression in either compartment promotes sRST axon regrowth through the glial scar, synapse reformation, and motor recovery, indicating NB-3 homophilic signaling between axons and scar cells inhibits axon regeneration.","method":"Spinal cord transection in vivo, siRNA knockdown in SCI model, electromyography, immunohistochemistry","journal":"Journal of neurotrauma","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo loss-of-function in defined cell compartments with functional recovery readout, single lab","pmids":["30156464"],"is_preprint":false},{"year":2022,"finding":"NB-3/CNTN6 is expressed in brain microvascular endothelial cells and maintains blood-brain barrier integrity; endothelial-specific NB-3 knockout increases BBB leakage and downregulates tight junction proteins in vivo; NB-3 acts via the Notch signaling pathway, and blocking Notch increases VEGF/VEGFR2 pathway activation under LPS/hypoxia.","method":"Conditional endothelial-specific KO mice, BBB permeability assays, transcriptome sequencing, tight junction protein immunoblotting, Notch pathway inhibition","journal":"Experimental neurology","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with specific BBB phenotype and pathway placement via transcriptomics and inhibitor, single lab","pmids":["35584741"],"is_preprint":false},{"year":2018,"finding":"CNTN6 deficiency in mice impairs allocentric navigation (spatial learning and memory in Morris water maze) in a sex-dependent manner, and CNTN6 is expressed in the hippocampal CA1 region during postnatal development.","method":"CNTN6 KO mice, Morris water maze, immunohistochemistry","journal":"Brain and behavior","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with specific behavioral readout and localization, single lab","pmids":["30106251"],"is_preprint":false},{"year":2025,"finding":"The CNTN6 locus is involved in lumenization and radial glial cell fate determination during early human cortical development; CNTN6 regulates radial glial cell proliferation and the nuclear-cytoplasmic translocation of PAX6, and partially functions through the Notch signaling pathway in early human brain organoids.","method":"Cerebral organoids, iPSC reprogramming, CRISPR genome editing, PAX6 localization assays, Notch pathway analysis","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — multiple complementary methods in human organoid model, preprint not yet peer-reviewed","pmids":["bio_10.1101_2025.10.09.681391"],"is_preprint":true}],"current_model":"CNTN6 (NB-3) is a GPI-anchored neural cell adhesion molecule of the contactin/immunoglobulin superfamily that functions as a non-canonical Notch1 ligand (promoting oligodendrocyte differentiation and early cortical radial glial development via Notch/Deltex1 signaling), forms a complex with CHL1 and PTPα to regulate apical dendrite orientation and cell-surface trafficking, localizes presynaptically at glutamatergic synapses to promote excitatory synapse formation in the cerebellum and hippocampus, guides corticospinal tract axon projection and branching, and in endothelial cells maintains blood-brain barrier integrity through Notch-dependent regulation of tight junction proteins."},"narrative":{"teleology":[{"year":2003,"claim":"Establishing that CNTN6 has an essential in vivo role: knockout mice revealed impaired motor coordination without gross brain structural defects, defining a specific behavioral phenotype attributable to CNTN6 loss.","evidence":"LacZ knock-in KO mice tested on rotarod, wire hang, and horizontal rod-walking assays","pmids":["12884264"],"confidence":"High","gaps":["Cellular and synaptic basis of the motor coordination deficit was unknown","Brain regions responsible for the phenotype were not identified"]},{"year":2004,"claim":"Identifying CNTN6's signaling mechanism: NB-3 was shown to function as a non-canonical Notch1 ligand that promotes oligodendrocyte differentiation via Deltex1 and Notch intracellular domain nuclear translocation, establishing a direct signaling axis for a contactin family member.","evidence":"Cell-based reporter assays, primary oligodendrocyte cultures, nuclear translocation assays","pmids":["15082708"],"confidence":"High","gaps":["Whether CNTN6-Notch signaling operates in vivo during myelination was not demonstrated","Structural basis of CNTN6-Notch1 interaction was not defined"]},{"year":2007,"claim":"Defining a cortical signaling complex: CNTN6 directly associates with CHL1 and both regulate PTPα activity to control apical dendrite orientation of deep-layer pyramidal neurons, with PTPα KO phenocopying CNTN6 KO, establishing genetic epistasis.","evidence":"Reciprocal co-immunoprecipitation, CNTN6 and PTPα KO mice, PTPα activity assays, immunohistochemistry","pmids":["18046458"],"confidence":"High","gaps":["Downstream cytoskeletal effectors linking PTPα to dendrite polarity were not identified","Whether this complex operates outside the neocortex was unknown"]},{"year":2009,"claim":"Resolving the synaptic function: CNTN6 localizes presynaptically at cerebellar parallel fiber–Purkinje cell glutamatergic synapses and is required for normal synaptic terminal density and neuronal survival during cerebellar development.","evidence":"Immunofluorescence co-localization with VGLUT1 and mGluR1α, CNTN6 KO mice, caspase activity assays","pmids":["19672956"],"confidence":"High","gaps":["Trans-synaptic binding partner at Purkinje cells was not identified","Whether the survival effect is cell-autonomous was not resolved"]},{"year":2010,"claim":"Extending synaptic specificity to hippocampus: CNTN6 selectively promotes glutamatergic (VGLUT1/2-positive) but not GABAergic synapse formation in the postnatal hippocampal formation.","evidence":"CNTN6 KO mice, quantitative immunofluorescence for VGLUT1, VGLUT2, and VGAT","pmids":["20176085"],"confidence":"Medium","gaps":["Molecular basis for excitatory synapse selectivity was not determined","Electrophysiological consequences were not measured"]},{"year":2011,"claim":"Clarifying CNTN6 trafficking and neuroprotection: PTPα promotes CNTN6 cell-surface expression via its extracellular domain (independent of catalytic activity), and separately, CNTN6 supports neuronal survival and neurite outgrowth partly through homophilic binding, with KO mice showing increased stroke vulnerability.","evidence":"Surface biotinylation, domain mutagenesis in COS1 cells, PTPα KO cortical neurons; MCAO in KO mice, oxygen-glucose deprivation in primary neurons","pmids":["21622556","21817151"],"confidence":"High","gaps":["Whether PTPα-dependent trafficking regulates CNTN6 function at synapses in vivo was not tested","Downstream survival signaling pathway was not defined"]},{"year":2012,"claim":"Establishing an axon guidance role: CNTN6 loss delays corticospinal tract axon projection and terminal branching into spinal gray matter during development, although final trajectory eventually normalizes.","evidence":"CST axon tracing at multiple developmental stages in CNTN6 KO mice","pmids":["21935948"],"confidence":"Medium","gaps":["Receptor or guidance cue partner for CNTN6 in CST axon guidance was not identified","Whether the delay has lasting functional consequences was not assessed"]},{"year":2014,"claim":"Identifying a co-activator of CNTN6-Notch signaling: adropin physically interacts with CNTN6 and potentiates its Notch signaling activity, and adropin KO phenocopies CNTN6 KO motor and synaptic deficits.","evidence":"Yeast two-hybrid screening, adropin KO mice behavioral testing, Notch target gene expression assays","pmids":["25074942"],"confidence":"High","gaps":["Binding interface between adropin and CNTN6 was not mapped","Whether adropin-CNTN6 interaction is required in vivo for oligodendrogliogenesis was not tested"]},{"year":2016,"claim":"Linking CNTN6 to human neurodevelopmental disease: CNTN6 deletions and rare coding variants are enriched in autism spectrum disorder and associated with hyperacusis and altered auditory brainstem response latencies.","evidence":"Clinical sequencing, ABR electrophysiology, case-control cohort analysis","pmids":["27166760"],"confidence":"Medium","gaps":["Functional impact of individual coding variants was not experimentally validated","Replication in independent cohorts was not reported"]},{"year":2018,"claim":"Revealing CNTN6 as a regeneration inhibitor and a regulator of spatial memory: homophilic CNTN6 signaling between serotonergic axons and scar cells inhibits axon regeneration after spinal cord injury, and separately CNTN6 KO impairs allocentric spatial navigation in a sex-dependent manner.","evidence":"siRNA knockdown in spinal cord transection model with electromyography; Morris water maze in CNTN6 KO mice","pmids":["30156464","30106251"],"confidence":"Medium","gaps":["Intracellular pathway mediating homophilic inhibition of regeneration was not defined","Synaptic or connectivity basis of the spatial memory deficit was not characterized"]},{"year":2022,"claim":"Extending CNTN6 function beyond neurons: endothelial-specific CNTN6 knockout revealed that CNTN6 maintains blood–brain barrier integrity through Notch-dependent regulation of tight junction proteins, with its loss increasing BBB permeability and VEGF/VEGFR2 activation.","evidence":"Conditional endothelial-specific KO mice, BBB permeability assays, transcriptome sequencing, Notch pathway inhibition","pmids":["35584741"],"confidence":"Medium","gaps":["Whether CNTN6 acts as a Notch ligand in endothelial cells or signals through a different mechanism was not resolved","Relevance to neurological disease with BBB disruption was not tested"]},{"year":null,"claim":"Major open questions include: the structural basis of CNTN6–Notch1 interaction, the identity of trans-synaptic partners mediating excitatory synapse specificity, whether the diverse CNTN6 functions (Notch signaling, PTPα regulation, homophilic adhesion) operate through shared or independent downstream pathways, and functional validation of ASD-associated variants.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal structure or cryo-EM model of CNTN6 or its complexes exists","Cell-type-specific conditional knockouts in most brain regions have not been generated","Electrophysiological synaptic phenotypes have not been systematically characterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[2,3,6,10]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,5]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,5]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[6]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,8,11]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[3,4,12]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,7]}],"complexes":["NB-3/CHL1/PTPα complex"],"partners":["CHL1","PTPRA","NOTCH1","ENHO","DTX1"],"other_free_text":[]},"mechanistic_narrative":"CNTN6 (NB-3) is a GPI-anchored immunoglobulin superfamily cell adhesion molecule that plays broad roles in neural circuit assembly, synaptic specification, and barrier integrity through both homophilic interactions and non-canonical Notch signaling. CNTN6 acts as a Notch1 ligand that triggers intracellular domain nuclear translocation and Deltex1-dependent signaling to promote oligodendrogliogenesis, and this pathway is potentiated by the secreted peptide adropin [PMID:15082708, PMID:25074942]. At the synapse, CNTN6 localizes presynaptically and selectively promotes glutamatergic (but not GABAergic) synapse formation in the cerebellum and hippocampus, while forming a complex with CHL1 and PTPα that controls apical dendrite orientation of deep-layer cortical neurons [PMID:19672956, PMID:20176085, PMID:18046458]. In brain microvascular endothelial cells, CNTN6 maintains blood–brain barrier integrity through Notch-dependent regulation of tight junction proteins, and its loss increases BBB permeability [PMID:35584741]."},"prefetch_data":{"uniprot":{"accession":"Q9UQ52","full_name":"Contactin-6","aliases":["Neural recognition molecule NB-3","hNB-3"],"length_aa":1028,"mass_kda":114.0,"function":"Contactins mediate cell surface interactions during nervous system development. 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. Involved in motor coordination (By similarity)","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/Q9UQ52/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CNTN6","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CNTN6","total_profiled":1310},"omim":[{"mim_id":"607220","title":"CONTACTIN 6; CNTN6","url":"https://www.omim.org/entry/607220"},{"mim_id":"607219","title":"CONTACTIN 5; CNTN5","url":"https://www.omim.org/entry/607219"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"adrenal gland","ntpm":3.2},{"tissue":"brain","ntpm":8.8},{"tissue":"thyroid gland","ntpm":9.0}],"url":"https://www.proteinatlas.org/search/CNTN6"},"hgnc":{"alias_symbol":["NB-3"],"prev_symbol":[]},"alphafold":{"accession":"Q9UQ52","domains":[{"cath_id":"2.60.40.10","chopping":"23-118","consensus_level":"high","plddt":88.0,"start":23,"end":118},{"cath_id":"2.60.40.10","chopping":"139-223","consensus_level":"medium","plddt":89.2573,"start":139,"end":223},{"cath_id":"2.60.40.10","chopping":"225-317","consensus_level":"medium","plddt":94.0855,"start":225,"end":317},{"cath_id":"2.60.40.10","chopping":"323-403","consensus_level":"high","plddt":92.6975,"start":323,"end":403},{"cath_id":"2.60.40.10","chopping":"406-496","consensus_level":"high","plddt":88.6412,"start":406,"end":496},{"cath_id":"2.60.40.10","chopping":"503-594","consensus_level":"high","plddt":86.9845,"start":503,"end":594},{"cath_id":"2.60.40.10","chopping":"601-694","consensus_level":"high","plddt":92.8891,"start":601,"end":694},{"cath_id":"2.60.40.10","chopping":"704-796","consensus_level":"high","plddt":89.8167,"start":704,"end":796},{"cath_id":"2.60.40.10","chopping":"806-896","consensus_level":"medium","plddt":85.9841,"start":806,"end":896}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UQ52","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UQ52-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UQ52-F1-predicted_aligned_error_v6.png","plddt_mean":86.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CNTN6","jax_strain_url":"https://www.jax.org/strain/search?query=CNTN6"},"sequence":{"accession":"Q9UQ52","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UQ52.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UQ52/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UQ52"}},"corpus_meta":[{"pmid":"15082708","id":"PMC_15082708","title":"NB-3/Notch1 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in primary oligodendrocytes, NB-3 increases myelin-associated glycoprotein transcripts.\",\n      \"method\": \"Cell-based reporter assays, primary oligodendrocyte cultures, nuclear translocation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple functional readouts in primary cells, replicated context with F3/contactin family, high citation count\",\n      \"pmids\": [\"15082708\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"NB-3/CNTN6-deficient mice exhibit impaired motor coordination (rotorod, wire hang, horizontal rod-walking tests) without loss of grasp force, establishing NB-3 has a defined in vivo role in motor coordination, while brain architecture remains grossly normal.\",\n      \"method\": \"Knockout mouse generation (LacZ knock-in), behavioral testing\",\n      \"journal\": \"Journal of neurobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with specific behavioral phenotypic readout, high citation count\",\n      \"pmids\": [\"12884264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NB-3 (CNTN6) directly associates with CHL1, enhances its cell surface expression, and both molecules interact with and regulate the activity of protein tyrosine phosphatase alpha (PTPα) to control apical dendrite orientation of deep-layer pyramidal neurons in the neocortex; PTPα-deficient mice phenocopy NB-3 and CHL1 deficiency with misoriented apical dendrites.\",\n      \"method\": \"Co-immunoprecipitation, NB-3 knockout mice, PTPα knockout mice, PTPα activity assays, immunohistochemistry\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, multiple knockout models, enzymatic activity assay, genetic epistasis\",\n      \"pmids\": [\"18046458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NB-3/CNTN6 is localized presynaptically at glutamatergic synapses between parallel fibers and Purkinje cells in the cerebellum; NB-3 deficiency reduces parallel fiber synaptic terminal density and increases caspase-dependent cell death in the developing cerebellum, and increases L1 immunoreactivity in the IGL.\",\n      \"method\": \"Immunofluorescence with presynaptic/postsynaptic markers (VGLUT1, mGluR1α), NB-3 knockout mice, caspase activity assays\",\n      \"journal\": \"Developmental neurobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization with functional consequence, clean KO with defined phenotype\",\n      \"pmids\": [\"19672956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NB-3/CNTN6 is required for glutamatergic (VGLUT1- and VGLUT2-positive) but not GABAergic synapse formation in the hippocampal formation during postnatal development; NB-3 knockout reduces VGLUT1/2 puncta density in regions of high NB-3 expression by ~20–30% without affecting VGAT puncta.\",\n      \"method\": \"NB-3 knockout mice, immunofluorescence with VGLUT1, VGLUT2, VGAT markers\",\n      \"journal\": \"Neuroscience letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with specific synaptic phenotype, single lab\",\n      \"pmids\": [\"20176085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PTPα promotes cell surface expression of NB-3/CNTN6 by facilitating its Golgi exit and stabilizing it at the plasma membrane, preventing its release; the extracellular region of PTPα (not its catalytic activity) is required for this effect.\",\n      \"method\": \"COS1 cell co-expression, cortical neuron fractionation from PTPα KO mice, surface biotinylation, domain mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mutagenesis of catalytic domain, multiple cell-biological assays, KO neurons\",\n      \"pmids\": [\"21622556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NB-3/CNTN6 promotes neuronal survival and neurite outgrowth; NB-3 substrate supports neurons partially through homophilic binding mechanisms; NB-3 knockout mice develop larger infarct volumes after MCAO and NB-3-deficient neurons show increased susceptibility to oxygen-glucose deprivation.\",\n      \"method\": \"NB-3 KO mice, middle cerebral artery occlusion, primary neuron cultures on NB-3 substrate, in vitro oxygen-glucose deprivation\",\n      \"journal\": \"Stroke\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO with defined phenotype plus in vitro substrate assay, single lab\",\n      \"pmids\": [\"21817151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NB-3/CNTN6 is expressed in projecting corticospinal tract (CST) axons and its loss delays CST axon projection and terminal branching into spinal gray matter during development, without preventing eventual normal trajectory completion.\",\n      \"method\": \"NB-3 KO mice, CST axon tracing at multiple developmental stages, immunohistochemistry\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with direct axon-tracing phenotype, single lab\",\n      \"pmids\": [\"21935948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Adropin interacts with NB-3/CNTN6 (identified by yeast two-hybrid screening), and this interaction promotes NB-3-induced Notch signaling activation and expression of Notch target genes; adropin knockout mice phenocopy NB-3 knockout mice with decreased locomotor activity, impaired motor coordination, and defective synapse formation.\",\n      \"method\": \"Yeast two-hybrid screening, adropin knockout mice, Notch target gene expression assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — yeast two-hybrid plus KO phenocopy, Notch signaling functional readout, high citation count\",\n      \"pmids\": [\"25074942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CNTN6 variants (deletions and rare coding variants) are enriched in ASD individuals and are associated with hyperacusis and changes in auditory pathway wave latency, supporting a role for CNTN6 in sensory-motor neuronal connectivity and neurite outgrowth in auditory pathways.\",\n      \"method\": \"Clinical sequencing, electrophysiological auditory testing (ABR wave latency), cohort case-control analysis\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — human variant association with direct electrophysiological functional readout, single cohort\",\n      \"pmids\": [\"27166760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NB-3/CNTN6 is induced in both serotonergic raphespinal tract (sRST) axons and scar-forming cells after spinal cord injury; blocking NB-3 expression in either compartment promotes sRST axon regrowth through the glial scar, synapse reformation, and motor recovery, indicating NB-3 homophilic signaling between axons and scar cells inhibits axon regeneration.\",\n      \"method\": \"Spinal cord transection in vivo, siRNA knockdown in SCI model, electromyography, immunohistochemistry\",\n      \"journal\": \"Journal of neurotrauma\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo loss-of-function in defined cell compartments with functional recovery readout, single lab\",\n      \"pmids\": [\"30156464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NB-3/CNTN6 is expressed in brain microvascular endothelial cells and maintains blood-brain barrier integrity; endothelial-specific NB-3 knockout increases BBB leakage and downregulates tight junction proteins in vivo; NB-3 acts via the Notch signaling pathway, and blocking Notch increases VEGF/VEGFR2 pathway activation under LPS/hypoxia.\",\n      \"method\": \"Conditional endothelial-specific KO mice, BBB permeability assays, transcriptome sequencing, tight junction protein immunoblotting, Notch pathway inhibition\",\n      \"journal\": \"Experimental neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with specific BBB phenotype and pathway placement via transcriptomics and inhibitor, single lab\",\n      \"pmids\": [\"35584741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CNTN6 deficiency in mice impairs allocentric navigation (spatial learning and memory in Morris water maze) in a sex-dependent manner, and CNTN6 is expressed in the hippocampal CA1 region during postnatal development.\",\n      \"method\": \"CNTN6 KO mice, Morris water maze, immunohistochemistry\",\n      \"journal\": \"Brain and behavior\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with specific behavioral readout and localization, single lab\",\n      \"pmids\": [\"30106251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The CNTN6 locus is involved in lumenization and radial glial cell fate determination during early human cortical development; CNTN6 regulates radial glial cell proliferation and the nuclear-cytoplasmic translocation of PAX6, and partially functions through the Notch signaling pathway in early human brain organoids.\",\n      \"method\": \"Cerebral organoids, iPSC reprogramming, CRISPR genome editing, PAX6 localization assays, Notch pathway analysis\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple complementary methods in human organoid model, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.10.09.681391\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"CNTN6 (NB-3) is a GPI-anchored neural cell adhesion molecule of the contactin/immunoglobulin superfamily that functions as a non-canonical Notch1 ligand (promoting oligodendrocyte differentiation and early cortical radial glial development via Notch/Deltex1 signaling), forms a complex with CHL1 and PTPα to regulate apical dendrite orientation and cell-surface trafficking, localizes presynaptically at glutamatergic synapses to promote excitatory synapse formation in the cerebellum and hippocampus, guides corticospinal tract axon projection and branching, and in endothelial cells maintains blood-brain barrier integrity through Notch-dependent regulation of tight junction proteins.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CNTN6 (NB-3) is a GPI-anchored immunoglobulin superfamily cell adhesion molecule that plays broad roles in neural circuit assembly, synaptic specification, and barrier integrity through both homophilic interactions and non-canonical Notch signaling. CNTN6 acts as a Notch1 ligand that triggers intracellular domain nuclear translocation and Deltex1-dependent signaling to promote oligodendrogliogenesis, and this pathway is potentiated by the secreted peptide adropin [PMID:15082708, PMID:25074942]. At the synapse, CNTN6 localizes presynaptically and selectively promotes glutamatergic (but not GABAergic) synapse formation in the cerebellum and hippocampus, while forming a complex with CHL1 and PTPα that controls apical dendrite orientation of deep-layer cortical neurons [PMID:19672956, PMID:20176085, PMID:18046458]. In brain microvascular endothelial cells, CNTN6 maintains blood–brain barrier integrity through Notch-dependent regulation of tight junction proteins, and its loss increases BBB permeability [PMID:35584741].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Establishing that CNTN6 has an essential in vivo role: knockout mice revealed impaired motor coordination without gross brain structural defects, defining a specific behavioral phenotype attributable to CNTN6 loss.\",\n      \"evidence\": \"LacZ knock-in KO mice tested on rotarod, wire hang, and horizontal rod-walking assays\",\n      \"pmids\": [\"12884264\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Cellular and synaptic basis of the motor coordination deficit was unknown\",\n        \"Brain regions responsible for the phenotype were not identified\"\n      ]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identifying CNTN6's signaling mechanism: NB-3 was shown to function as a non-canonical Notch1 ligand that promotes oligodendrocyte differentiation via Deltex1 and Notch intracellular domain nuclear translocation, establishing a direct signaling axis for a contactin family member.\",\n      \"evidence\": \"Cell-based reporter assays, primary oligodendrocyte cultures, nuclear translocation assays\",\n      \"pmids\": [\"15082708\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether CNTN6-Notch signaling operates in vivo during myelination was not demonstrated\",\n        \"Structural basis of CNTN6-Notch1 interaction was not defined\"\n      ]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defining a cortical signaling complex: CNTN6 directly associates with CHL1 and both regulate PTPα activity to control apical dendrite orientation of deep-layer pyramidal neurons, with PTPα KO phenocopying CNTN6 KO, establishing genetic epistasis.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, CNTN6 and PTPα KO mice, PTPα activity assays, immunohistochemistry\",\n      \"pmids\": [\"18046458\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Downstream cytoskeletal effectors linking PTPα to dendrite polarity were not identified\",\n        \"Whether this complex operates outside the neocortex was unknown\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Resolving the synaptic function: CNTN6 localizes presynaptically at cerebellar parallel fiber–Purkinje cell glutamatergic synapses and is required for normal synaptic terminal density and neuronal survival during cerebellar development.\",\n      \"evidence\": \"Immunofluorescence co-localization with VGLUT1 and mGluR1α, CNTN6 KO mice, caspase activity assays\",\n      \"pmids\": [\"19672956\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Trans-synaptic binding partner at Purkinje cells was not identified\",\n        \"Whether the survival effect is cell-autonomous was not resolved\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Extending synaptic specificity to hippocampus: CNTN6 selectively promotes glutamatergic (VGLUT1/2-positive) but not GABAergic synapse formation in the postnatal hippocampal formation.\",\n      \"evidence\": \"CNTN6 KO mice, quantitative immunofluorescence for VGLUT1, VGLUT2, and VGAT\",\n      \"pmids\": [\"20176085\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Molecular basis for excitatory synapse selectivity was not determined\",\n        \"Electrophysiological consequences were not measured\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Clarifying CNTN6 trafficking and neuroprotection: PTPα promotes CNTN6 cell-surface expression via its extracellular domain (independent of catalytic activity), and separately, CNTN6 supports neuronal survival and neurite outgrowth partly through homophilic binding, with KO mice showing increased stroke vulnerability.\",\n      \"evidence\": \"Surface biotinylation, domain mutagenesis in COS1 cells, PTPα KO cortical neurons; MCAO in KO mice, oxygen-glucose deprivation in primary neurons\",\n      \"pmids\": [\"21622556\", \"21817151\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether PTPα-dependent trafficking regulates CNTN6 function at synapses in vivo was not tested\",\n        \"Downstream survival signaling pathway was not defined\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Establishing an axon guidance role: CNTN6 loss delays corticospinal tract axon projection and terminal branching into spinal gray matter during development, although final trajectory eventually normalizes.\",\n      \"evidence\": \"CST axon tracing at multiple developmental stages in CNTN6 KO mice\",\n      \"pmids\": [\"21935948\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Receptor or guidance cue partner for CNTN6 in CST axon guidance was not identified\",\n        \"Whether the delay has lasting functional consequences was not assessed\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying a co-activator of CNTN6-Notch signaling: adropin physically interacts with CNTN6 and potentiates its Notch signaling activity, and adropin KO phenocopies CNTN6 KO motor and synaptic deficits.\",\n      \"evidence\": \"Yeast two-hybrid screening, adropin KO mice behavioral testing, Notch target gene expression assays\",\n      \"pmids\": [\"25074942\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Binding interface between adropin and CNTN6 was not mapped\",\n        \"Whether adropin-CNTN6 interaction is required in vivo for oligodendrogliogenesis was not tested\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Linking CNTN6 to human neurodevelopmental disease: CNTN6 deletions and rare coding variants are enriched in autism spectrum disorder and associated with hyperacusis and altered auditory brainstem response latencies.\",\n      \"evidence\": \"Clinical sequencing, ABR electrophysiology, case-control cohort analysis\",\n      \"pmids\": [\"27166760\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional impact of individual coding variants was not experimentally validated\",\n        \"Replication in independent cohorts was not reported\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealing CNTN6 as a regeneration inhibitor and a regulator of spatial memory: homophilic CNTN6 signaling between serotonergic axons and scar cells inhibits axon regeneration after spinal cord injury, and separately CNTN6 KO impairs allocentric spatial navigation in a sex-dependent manner.\",\n      \"evidence\": \"siRNA knockdown in spinal cord transection model with electromyography; Morris water maze in CNTN6 KO mice\",\n      \"pmids\": [\"30156464\", \"30106251\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Intracellular pathway mediating homophilic inhibition of regeneration was not defined\",\n        \"Synaptic or connectivity basis of the spatial memory deficit was not characterized\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extending CNTN6 function beyond neurons: endothelial-specific CNTN6 knockout revealed that CNTN6 maintains blood–brain barrier integrity through Notch-dependent regulation of tight junction proteins, with its loss increasing BBB permeability and VEGF/VEGFR2 activation.\",\n      \"evidence\": \"Conditional endothelial-specific KO mice, BBB permeability assays, transcriptome sequencing, Notch pathway inhibition\",\n      \"pmids\": [\"35584741\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether CNTN6 acts as a Notch ligand in endothelial cells or signals through a different mechanism was not resolved\",\n        \"Relevance to neurological disease with BBB disruption was not tested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major open questions include: the structural basis of CNTN6–Notch1 interaction, the identity of trans-synaptic partners mediating excitatory synapse specificity, whether the diverse CNTN6 functions (Notch signaling, PTPα regulation, homophilic adhesion) operate through shared or independent downstream pathways, and functional validation of ASD-associated variants.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No crystal structure or cryo-EM model of CNTN6 or its complexes exists\",\n        \"Cell-type-specific conditional knockouts in most brain regions have not been generated\",\n        \"Electrophysiological synaptic phenotypes have not been systematically characterized\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [2, 3, 6, 10]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 8, 11]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [3, 4, 12]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"complexes\": [\n      \"NB-3/CHL1/PTPα complex\"\n    ],\n    \"partners\": [\n      \"CHL1\",\n      \"PTPRA\",\n      \"NOTCH1\",\n      \"ENHO\",\n      \"DTX1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}