{"gene":"CNTNAP1","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":1997,"finding":"Caspr (CNTNAP1) is an axonal transmembrane glycoprotein homologous to Drosophila Neurexin IV that localizes specifically to the septate-like paranodal junctions between axons and paranodal loops of myelinating glia, as demonstrated by immunoelectron microscopy. Caspr is resistant to nonionic detergent extraction, indicating association with the axon cytoskeleton at these junctions.","method":"Immunoelectron microscopy, detergent extraction, immunofluorescence on myelinating cultures and peripheral/central nervous system tissue","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization by immunoelectron microscopy replicated in multiple tissue contexts and in vitro, with functional implication established by detergent resistance assay","pmids":["9396755"],"is_preprint":false},{"year":2000,"finding":"Caspr forms a cis complex with contactin in paranodal regions and juxtamesaxon. The two proteins co-extract, co-precipitate, and co-fractionate as a high-molecular-weight complex from neurons, myelinating cultures, and myelin preparations. A PI-PLC-resistant, lower-molecular-weight isoform of contactin is specifically associated with Caspr at paranodes, while a higher-molecular-weight contactin isoform at nodes is not Caspr-associated, indicating that Caspr determines the paranodal targeting of contactin. Blocking glial receptor RPTPβ inhibits paranodal targeting of the complex.","method":"Co-immunoprecipitation, sucrose gradient fractionation, cell surface biotinylation, myelinating coculture treatment with RPTPβ-Fc","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP and multiple biochemical methods across multiple preparation types, functional rescue/block experiment included","pmids":["11069942"],"is_preprint":false},{"year":2001,"finding":"Genetic knockout of Caspr (NCP1) in mice abolishes normal paranodal junction formation, renders paranodal loops disorganized, causes contactin to become undetectable at paranodes, and displaces K+ channels from juxtaparanodal into paranodal domains. Loss of Caspr also severely reduces peripheral nerve conduction velocity. This demonstrates a critical role for Caspr in axonal domain delineation and saltatory conduction.","method":"Caspr knockout mouse model, immunofluorescence, immunoelectron microscopy, electrophysiology (nerve conduction velocity)","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with multiple orthogonal phenotypic readouts (ultrastructure, ion channel localization, electrophysiology), replicated across CNS and PNS","pmids":["11395000"],"is_preprint":false},{"year":2000,"finding":"Surface transport of Caspr (paranodin) to the plasma membrane requires co-expression with the GPI-anchored adhesion molecule F3/contactin. Caspr is retained in the ER when transfected alone. Co-transfection with F3 delivers Caspr to the plasma membrane and recruits it into Triton X-100-insoluble lipid raft microdomains. The Ig domains of F3 mediate its association with Caspr, and both the GPI anchor and the fibronectin type III repeats of F3 are required cooperatively for this effect.","method":"Co-transfection in CHO and neuroblastoma cells, confocal microscopy, cell surface biotinylation, co-immunoprecipitation with F3 deletion constructs, detergent fractionation","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (confocal, biotinylation, co-IP, fractionation) in single study with domain-mapping constructs","pmids":["10769038"],"is_preprint":false},{"year":2002,"finding":"The glial isoform NF155 of neurofascin binds specifically to the Caspr–contactin axonal complex. The extracellular domain of NF155 binds to transfected cells expressing Caspr–contactin at the cell surface and pulls down the complex from brain lysates in vitro. NF155 antibodies and soluble NF155 extracellular domain inhibit myelination in cocultures, establishing NF155 as the glial receptor for the paranodal Caspr–contactin complex.","method":"Cell-based binding assay (transfected HEK cells), in vitro pulldown from brain lysates, myelinating coculture inhibition assay","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding demonstrated by two independent assays plus functional inhibition of myelination","pmids":["11839274"],"is_preprint":false},{"year":2002,"finding":"The cytoplasmic domain of Caspr is required for retention of the Caspr–contactin complex at paranodal junctions. Transgenic mice expressing a Caspr mutant lacking its intracellular domain show the truncated protein mislocated within the axon rather than at the junctional axolemma. A short sequence in the cytoplasmic domain mediates binding to the cytoskeletal protein 4.1B. Clustering of contactin on the cell surface induces coclustering of Caspr and immobilized 4.1B at the plasma membrane, and deletion of the 4.1B-binding site accelerates internalization of a Caspr–contactin chimera.","method":"Transgenic mouse rescue experiments, immunoelectron microscopy, co-immunoprecipitation, cell clustering assay, internalization assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including in vivo transgenic rescue and cell-based functional assays","pmids":["12082082"],"is_preprint":false},{"year":2003,"finding":"Caspr regulates the intracellular processing of contactin. Coexpression of Caspr with contactin during biosynthesis produces a low-molecular-weight, endoglycosidase H-sensitive contactin isoform that remains at the cell surface associated with Caspr but is unable to bind NF155. NF155 binds directly to contactin alone, but this interaction is inhibited when Caspr is co-expressed. Genetic deletion of Caspr in mice shifts contactin from the LMw to the HMw glycoform.","method":"Co-transfection, endoglycosidase H digestion, co-immunoprecipitation, Caspr-null mouse analysis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical mechanism defined in vitro and validated by in vivo knockout, multiple orthogonal methods","pmids":["14676309"],"is_preprint":false},{"year":2003,"finding":"The conserved intracellular juxtamembrane GNP motif of Caspr/paranodin binds FERM-domain-containing proteins 4.1R and 4.1B. Protein 4.1B co-immunoprecipitates with Caspr in brain homogenates and accumulates progressively at paranodes during postnatal development, following the developmental concentration of Caspr at paranodes in both central and peripheral myelinated axons.","method":"GST pulldown, co-immunoprecipitation from brain homogenates, immunohistochemistry during postnatal development","journal":"The European journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding (pulldown) confirmed by co-IP in brain and corroborated by in vivo developmental co-localization","pmids":["12542678"],"is_preprint":false},{"year":2010,"finding":"Caspr's interaction with protein 4.1B via its cytoplasmic domain is required for efficient membrane barrier function at the paranodal junction (PNJ). Transgenic Caspr-d4.1 mutant lacking the 4.1-binding sequence localizes to the PNJ and recruits contactin and NF155, but Kv1 channels are aberrantly detected at paranodes, indicating that the Caspr–4.1B interaction is needed to exclude Kv1 channels from the paranodal domain.","method":"Transgenic rescue in Caspr-null mice, immunofluorescence, confocal microscopy","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo transgenic rescue experiment with domain-specific mutant, functional ion channel localization readout","pmids":["20164332"],"is_preprint":false},{"year":2003,"finding":"The paranodal Caspr–F3/contactin complex traffics to the cell surface via a non-conventional Golgi-independent pathway. When Caspr is transfected alone, it is retained in the ER; ER retention is governed by the ectodomain. Cell surface delivery requires N-glycosylation and calnexin-mediated quality control. When complexed with F3, the glycoproteins are endoglycosidase H-sensitive and brefeldin A-insensitive at the cell surface, and recruited to lipid rafts.","method":"Brefeldin A treatment, EndoH digestion, N-glycosylation inhibition, lectin-chaperone (calnexin) analysis, confocal microscopy, chimeric construct analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal pharmacological and biochemical approaches defining a novel trafficking pathway","pmids":["12972410"],"is_preprint":false},{"year":2003,"finding":"Nogo-A, an oligodendroglial protein concentrated at CNS paranodes, interacts directly with axonal Caspr in trans. CHO cells co-transfected with Caspr and F3 bind specifically to Nogo-66 peptide substrates, and this binding persists after PI-PLC removal of GPI-anchored F3, indicating a direct Nogo-66/Caspr interaction. Nogo-A and Caspr co-immunoprecipitate with Kv1.1 and Kv1.2 channels; in paranodal junction-defective pathological models, Nogo-A congregation is reduced and Kv1 channels shift toward paranodes.","method":"Cell-based binding assay with PI-PLC treatment, co-immunoprecipitation, immunofluorescence in pathological mouse models","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding shown by PI-PLC experiment and co-IP, but mechanistic link to K+ channel localization is correlative","pmids":["14592966"],"is_preprint":false},{"year":2003,"finding":"Caspr/paranodin associates with the tumor suppressor schwannomin/merlin via the FERM domain of schwannomin binding to the Caspr GNP motif, and with β1 integrin. All three proteins co-immunoprecipitate from brain extracts. Caspr enhances the association between β1 integrin and schwannomin. In jimpy dysmyelinating mice with deficient paranodal junctions, interactions among these three proteins are profoundly altered.","method":"GST pulldown, co-immunoprecipitation from brain homogenates and transfected COS-7 cells, jimpy mouse analysis","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP confirmed in brain and in cells with domain mapping, but functional consequence of the interaction is not directly demonstrated","pmids":["12558984"],"is_preprint":false},{"year":2009,"finding":"Caspr is required for structural integrity of calyceal synapses at vestibular hair cells and for clustering of KCNQ4 K+ channels at the postsynaptic membrane. In Caspr knockout mice, the separation between hair cell and afferent neuron membranes is irregularly increased, and KCNQ4 fails to cluster at the postsynaptic membrane, instead distributing diffusely along the calyceal membrane.","method":"Freeze-fracture electron microscopy, immunolabeling, Caspr knockout mouse analysis","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with ultrastructural and molecular phenotypic readouts, multiple methods","pmids":["19279247"],"is_preprint":false},{"year":2009,"finding":"A novel frameshift mutation in Caspr (shambling mouse) causing loss of transmembrane and cytoplasmic domains abolishes paranodal junction formation and causes axonal transport defects (large mitochondria, abnormal organelle accumulation at paranodes), reduced expression of Caspr, contactin, and NF155 at paranodes, aberrant localization of voltage-gated ion channels at the nodal/paranodal axolemma, and reduced saltatory conduction velocity.","method":"Positional cloning, immunohistochemistry, electron microscopy, electrophysiology in mutant mice","journal":"Journal of neuropathology and experimental neurology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with ultrastructural, molecular, and electrophysiological readouts in vivo","pmids":["19816196"],"is_preprint":false},{"year":2010,"finding":"Cellular prion protein (PrP) directly binds Caspr and inhibits Reelin-mediated proteolytic shedding of Caspr from the neuronal cell surface. This increases surface Caspr levels and potentiates Caspr's inhibitory effect on neurite outgrowth. PrP-deficient neurons have reduced surface Caspr and enhanced neurite outgrowth in vitro; PrP-deficient mice show more efficient axon regeneration following spinal cord injury.","method":"Co-immunoprecipitation (direct binding of PrP to Caspr), neurite outgrowth assays, surface Caspr quantification, PrP knockout mouse analysis, in vivo spinal cord injury model","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding shown by co-IP, functional consequences demonstrated in vitro and in vivo, single study","pmids":["20610764"],"is_preprint":false},{"year":2013,"finding":"Homozygous frameshift mutations in CNTNAP1 in humans cause severe arthrogryposis multiplex congenita with markedly reduced motor nerve conduction velocity (<10 m/s) and transmission electron microscopy-confirmed severe abnormalities in nodes of Ranvier width and myelinated axon ultrastructure, establishing CNTNAP1/Caspr as essential for paranodal junction integrity and saltatory conduction in humans.","method":"Whole exome sequencing, nerve biopsy with transmission electron microscopy, nerve conduction studies, zebrafish morpholino knockdown","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — human loss-of-function mutations with in vivo ultrastructural and electrophysiological validation across multiple unrelated families","pmids":["24319099"],"is_preprint":false},{"year":2014,"finding":"Caspr4, in a coreceptor complex with contactin5/NB2 on proprioceptive sensory terminals, interacts with NrCAM/CHL1 on GABAergic spinal interneurons to direct high-density accumulation of inhibitory GABAergic boutons at sensory terminals. Genetic elimination of NB2 (contactin5) disproportionately strips inhibitory boutons from high-density GABApre-sensory synapses.","method":"Genetic knockout (NB2-null mice), immunofluorescence, synaptic density quantification in spinal cord","journal":"Neuron","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — this paper concerns Caspr4, not CNTNAP1/Caspr1; included because it demonstrates related complex biology but finding is attributed to Caspr4 not Caspr1 — NOTE: reclassifying as out of scope for CNTNAP1 specifically","pmids":["24411736"],"is_preprint":false},{"year":2014,"finding":"Both Caspr and Caspr2 are required for the radial organization of Kv1 channels along the inner mesaxon and circumferential ring in peripheral myelinated axons. In mice lacking both Caspr and Caspr2, Kv1 channels form large aggregates dispersed along the axolemma rather than clustered at the internodal line. Additionally, deletion of both proteins causes widening of nodes of Ranvier, showing that Caspr2 (present at paranodes in Caspr-null mice) can partially compensate for Caspr's barrier function.","method":"Double-knockout mouse generation (caspr-/-/caspr2-/-), immunofluorescence, confocal microscopy","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — double genetic knockout with clear molecular phenotype, demonstrates non-redundant and compensatory roles","pmids":["25378149"],"is_preprint":false},{"year":2016,"finding":"CNTNAP1 mutations in humans produce characteristic ultrastructural lesions: absence of transverse bands at paranodal axoglial junctions, loss of attachment between myelin loops and axolemma, and elongated Schwann cell processes dissociating the membranes at the node of Ranvier—lesions exclusively in the region where Caspr-1 is located, recapitulating caspr-1-null mouse pathology.","method":"Nerve biopsy with electron microscopy in compound heterozygous CNTNAP1 mutation patients, comparison with caspr-null mice","journal":"Journal of neuropathology and experimental neurology","confidence":"High","confidence_rationale":"Tier 2 / Strong — human ultrastructural pathology directly linked to loss-of-function mutations, replicated across multiple patients and consistent with mouse knockout data","pmids":["27818385"],"is_preprint":false},{"year":2017,"finding":"Caspr is expressed by radial glial neural progenitor cells and controls the temporal specification of neuronal versus astrocyte fate in the developing mouse cerebral cortex. Loss of Caspr delays neuronal production and induces precocious astrogenesis. At the molecular level, Caspr cooperates with the intracellular domain of Notch to repress transcription of the Notch effector Hes1. ShRNA knockdown of Hes1 rescues the abnormal neurogenesis and astrogenesis in Caspr-deficient mice.","method":"Caspr knockout mouse analysis, in utero electroporation, immunofluorescence, shRNA knockdown of Hes1, transcriptional reporter assays","journal":"Cerebral cortex","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function with epistasis rescue (Hes1 shRNA), single lab study","pmids":["26740489"],"is_preprint":false},{"year":2009,"finding":"During myelination, NF155 on oligodendrocyte processes acts as the glial partner responsible for paranodal Caspr distribution: Caspr is recruited to the cell surface at the axon–oligodendrocyte contact zone, where it undergoes a helical distribution that mirrors the turns of the overlying myelin sheath, consistent with trans-interaction with NF155 tracking the spiraling membrane.","method":"Time-lapse imaging and immunofluorescence in myelinating cultures, developmental time-course analysis","journal":"Journal of neuroscience research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — live imaging and correlative localization in myelinating cultures, no direct binding assay in this paper but consistent with other studies","pmids":["19170162"],"is_preprint":false}],"current_model":"CNTNAP1/Caspr is an axonal transmembrane glycoprotein that forms a cis complex with contactin (which is required for its surface delivery and lipid raft recruitment) at paranodal junctions, where it interacts in trans with the glial receptor NF155; the cytoplasmic domain of Caspr anchors this complex to the axon cytoskeleton via protein 4.1B, and this interaction is essential for generating an efficient membrane diffusion barrier at the paranode that restricts ion channels to their correct axonal domains and enables saltatory nerve conduction; additionally, Caspr regulates contactin glycoform processing, participates in myelination-independent functions including neural progenitor temporal fate specification via Notch/Hes1 signaling, and its loss-of-function in humans and mice causes severe hypomyelinating neuropathy with paranodal ultrastructural defects."},"narrative":{"mechanistic_narrative":"CNTNAP1 (Caspr/paranodin) is an axonal transmembrane glycoprotein that builds and maintains the septate-like paranodal axoglial junction required for saltatory nerve conduction [PMID:9396755, PMID:11395000]. At the paranode it forms a cis complex with the GPI-anchored adhesion molecule contactin (F3), which is required to release Caspr from the ER, deliver it to the cell surface via a non-conventional Golgi-independent pathway, and recruit it into lipid raft microdomains [PMID:10769038, PMID:12972410]; reciprocally, Caspr governs contactin glycoform processing, generating a low-molecular-weight paranodal isoform [PMID:14676309]. The surface Caspr-contactin complex engages the glial neurofascin isoform NF155 in trans, the interaction that drives paranodal assembly during myelination [PMID:11839274, PMID:19170162]. The cytoplasmic juxtamembrane GNP motif of Caspr anchors the complex to the axonal cytoskeleton through the FERM-domain protein 4.1B (and 4.1R), and this linkage retains the complex at the junctional axolemma and establishes the membrane diffusion barrier that excludes Kv1 channels from the paranode and keeps nodal/juxtaparanodal domains properly partitioned [PMID:12082082, PMID:12542678, PMID:20164332]. Genetic loss of Caspr in mice abolishes paranodal junction formation, mislocalizes K+ channels, and slows nerve conduction, with Caspr2 able to partially compensate for its barrier function [PMID:11395000, PMID:25378149]. Beyond myelination, Caspr supports calyceal synapse integrity and KCNQ4 clustering at vestibular hair cells [PMID:19279247] and, in radial glial progenitors, cooperates with the Notch intracellular domain to repress Hes1 and control the temporal switch from neurogenesis to astrogenesis [PMID:26740489]. In humans, homozygous and compound heterozygous CNTNAP1 loss-of-function mutations cause severe hypomyelinating neuropathy with arthrogryposis multiplex congenita, markedly reduced motor nerve conduction, and paranodal ultrastructural lesions that recapitulate the mouse knockout [PMID:24319099, PMID:27818385].","teleology":[{"year":1997,"claim":"Establishing where Caspr resides defined the structural problem it solves: it is an axonal glycoprotein concentrated at the septate-like paranodal junction and tethered to the cytoskeleton there.","evidence":"Immunoelectron microscopy and detergent-extraction assays on myelinating cultures and nervous tissue","pmids":["9396755"],"confidence":"High","gaps":["No binding partners identified at this stage","Functional role inferred from localization, not tested"]},{"year":2000,"claim":"Identifying contactin as both a binding partner and a trafficking chaperone answered how Caspr reaches the cell surface and is targeted to the paranode.","evidence":"Co-IP, sucrose gradient fractionation, surface biotinylation in neurons/myelin, plus co-transfection with F3 deletion constructs showing ER retention rescue and lipid raft recruitment","pmids":["11069942","10769038"],"confidence":"High","gaps":["Glial trans-receptor for the complex not yet identified","Mechanism of paranodal vs nodal isoform sorting incompletely defined"]},{"year":2001,"claim":"Genetic knockout demonstrated that Caspr is causally required for paranodal junction formation, ion channel partitioning, and saltatory conduction, not merely a marker.","evidence":"Caspr-null mouse with immunofluorescence, immunoEM, and nerve conduction velocity measurement","pmids":["11395000"],"confidence":"High","gaps":["Molecular basis of barrier function not yet dissected","Cytoplasmic vs ectodomain contributions unresolved"]},{"year":2002,"claim":"Defining NF155 as the glial receptor and the cytoplasmic domain plus 4.1B as the cytoskeletal anchor explained how the complex is held in trans at the junction and retained at the axolemma.","evidence":"Cell-based binding and brain-lysate pulldown for NF155, coculture myelination inhibition; transgenic cytoplasmic-domain-deletion rescue and clustering/internalization assays for 4.1B","pmids":["11839274","12082082"],"confidence":"High","gaps":["Whether 4.1B linkage specifically gates ion channel exclusion not yet shown","Stoichiometry of trans complex unknown"]},{"year":2003,"claim":"A cluster of biochemical studies resolved the trafficking pathway, the reciprocal control of contactin glycoforms, the 4.1R/4.1B-binding GNP motif, and additional cytoplasmic partners (schwannomin/merlin, beta1 integrin) and an axonal trans-partner (Nogo-A).","evidence":"Brefeldin A/EndoH/N-glycosylation/calnexin analyses, EndoH and Caspr-null glycoform analysis, GST pulldown and brain co-IP, PI-PLC binding assays","pmids":["12972410","14676309","12542678","12558984","14592966"],"confidence":"High","gaps":["Functional consequence of merlin/integrin association not directly demonstrated [#11]","Nogo-A link to Kv1 channel positioning is correlative [#10]"]},{"year":2010,"claim":"Separating the 4.1B-binding sequence from the rest of Caspr showed that the cytoskeletal linkage—rather than complex assembly per se—is what creates the diffusion barrier excluding Kv1 channels.","evidence":"Transgenic Caspr-d4.1 rescue in Caspr-null mice with ion channel immunofluorescence","pmids":["20164332"],"confidence":"High","gaps":["Biophysical nature of the diffusion barrier not directly measured","Whether 4.1B alone is sufficient for barrier formation unknown"]},{"year":2009,"claim":"Myelination-independent and live-imaging studies extended Caspr's role to calyceal synapse integrity/KCNQ4 clustering and revealed NF155-tracked helical Caspr distribution during paranode assembly.","evidence":"Caspr-null freeze-fracture EM and KCNQ4 immunolabeling; shambling frameshift mutant phenotyping; time-lapse myelinating culture imaging","pmids":["19279247","19816196","19170162"],"confidence":"High","gaps":["Mechanism of KCNQ4 clustering by Caspr not defined","Direct NF155 binding not assayed in the imaging study [#20]"]},{"year":2013,"claim":"Human genetics established CNTNAP1 as a disease gene, showing that loss of function causes severe congenital hypomyelinating neuropathy and arthrogryposis with paranodal pathology mirroring the mouse.","evidence":"Whole exome sequencing of multiple families, nerve biopsy TEM, nerve conduction studies, zebrafish morpholino knockdown","pmids":["24319099"],"confidence":"High","gaps":["Genotype-phenotype correlation across mutation types not fully resolved"]},{"year":2014,"claim":"Double knockout revealed that Caspr2 partially compensates for Caspr's barrier function and that both are required for radial Kv1 channel organization in peripheral axons.","evidence":"caspr-/-/caspr2-/- double-knockout mice with immunofluorescence","pmids":["25378149"],"confidence":"High","gaps":["Molecular basis of Caspr2 compensation unknown"]},{"year":2017,"claim":"A developmental role was uncovered in which Caspr controls the neurogenesis-to-astrogenesis switch in cortical progenitors through Notch/Hes1 repression, distinct from its paranodal function.","evidence":"Caspr-null mice, in utero electroporation, Hes1 shRNA epistasis rescue, transcriptional reporters","pmids":["26740489"],"confidence":"Medium","gaps":["Single-lab study","How a junctional adhesion protein engages Notch signaling mechanistically is unclear"]},{"year":null,"claim":"How Caspr's diverse functions—paranodal barrier formation, contactin glycoform control, synaptic ion channel clustering, and Notch-dependent progenitor fate—are coordinated and whether they share a unifying biochemical mechanism remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of the trans complex","Mechanism connecting cytoplasmic signaling roles to the adhesion ectodomain undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,2,4]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5,7,8]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[5,7]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,3,9]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[3,9]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,5]}],"pathway":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[19]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[2,12]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[19]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[15,18]}],"complexes":["Caspr-contactin paranodal complex","paranodal axoglial junction"],"partners":["CNTN1","NFASC","EPB41L3","EPB41","NLGN","NF155","PRNP","RTN4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P78357","full_name":"Contactin-associated protein 1","aliases":["Neurexin IV","Neurexin-4","p190"],"length_aa":1384,"mass_kda":156.3,"function":"Required, with CNTNAP2, for radial and longitudinal organization of myelinated axons. Plays a role in the formation of functional distinct domains critical for saltatory conduction of nerve impulses in myelinated nerve fibers. Demarcates the paranodal region of the axo-glial junction. In association with contactin involved in the signaling between axons and myelinating glial cells","subcellular_location":"Membrane; Cell junction, paranodal septate junction","url":"https://www.uniprot.org/uniprotkb/P78357/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CNTNAP1","classification":"Not Classified","n_dependent_lines":24,"n_total_lines":1208,"dependency_fraction":0.019867549668874173},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CANX","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CNTNAP1","total_profiled":1310},"omim":[{"mim_id":"618484","title":"ARTHROGRYPOSIS MULTIPLEX CONGENITA 3, MYOGENIC TYPE; AMC3","url":"https://www.omim.org/entry/618484"},{"mim_id":"618186","title":"NEUROPATHY, CONGENITAL HYPOMYELINATING, 3; CHN3","url":"https://www.omim.org/entry/618186"},{"mim_id":"616287","title":"LETHAL CONGENITAL CONTRACTURE SYNDROME 8; LCCS8","url":"https://www.omim.org/entry/616287"},{"mim_id":"616286","title":"LETHAL CONGENITAL CONTRACTURE SYNDROME 7; LCCS7","url":"https://www.omim.org/entry/616286"},{"mim_id":"610517","title":"CONTACTIN-ASSOCIATED PROTEIN-LIKE 3; CNTNAP3","url":"https://www.omim.org/entry/610517"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in 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mutants.","date":"2000","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/10979970","citation_count":36,"is_preprint":false},{"pmid":"10939588","id":"PMC_10939588","title":"P190-B, a Rho-GTPase-activating protein, is differentially expressed in terminal end buds and breast cancer.","date":"2000","source":"Cell growth & differentiation : the molecular biology journal of the American Association for Cancer Research","url":"https://pubmed.ncbi.nlm.nih.gov/10939588","citation_count":35,"is_preprint":false},{"pmid":"9266939","id":"PMC_9266939","title":"Establishment of a novel human myeloid leukaemia cell line (HNT-34) with t(3;3)(q21;q26), t(9;22)(q34;q11) and the expression of EVI1 gene, P210 and P190 BCR/ABL chimaeric transcripts from a patient with AML after MDS with 3q21q26 syndrome.","date":"1997","source":"British journal of haematology","url":"https://pubmed.ncbi.nlm.nih.gov/9266939","citation_count":35,"is_preprint":false},{"pmid":"17662267","id":"PMC_17662267","title":"Crosstalk between the p190-B RhoGAP and IGF signaling pathways is required for embryonic mammary bud development.","date":"2007","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/17662267","citation_count":34,"is_preprint":false},{"pmid":"22357615","id":"PMC_22357615","title":"Rnd1 and Rnd3 targeting to lipid raft is required for p190 RhoGAP activation.","date":"2012","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/22357615","citation_count":34,"is_preprint":false},{"pmid":"17392819","id":"PMC_17392819","title":"Increased resistance to a farnesyltransferase inhibitor by N-cadherin expression in Bcr/Abl-P190 lymphoblastic leukemia cells.","date":"2007","source":"Leukemia","url":"https://pubmed.ncbi.nlm.nih.gov/17392819","citation_count":34,"is_preprint":false},{"pmid":"17958915","id":"PMC_17958915","title":"Nilotinib treatment in mouse models of P190 Bcr/Abl lymphoblastic leukemia.","date":"2007","source":"Molecular cancer","url":"https://pubmed.ncbi.nlm.nih.gov/17958915","citation_count":33,"is_preprint":false},{"pmid":"19279247","id":"PMC_19279247","title":"The septate junction protein caspr is required for structural support and retention of KCNQ4 at calyceal synapses of vestibular hair cells.","date":"2009","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/19279247","citation_count":32,"is_preprint":false},{"pmid":"19816196","id":"PMC_19816196","title":"A novel Caspr mutation causes the shambling mouse phenotype by disrupting axoglial interactions of myelinated nerves.","date":"2009","source":"Journal of neuropathology and experimental neurology","url":"https://pubmed.ncbi.nlm.nih.gov/19816196","citation_count":32,"is_preprint":false},{"pmid":"12554790","id":"PMC_12554790","title":"Protein tyrosine phosphatase PTP20 induces actin cytoskeleton reorganization by dephosphorylating p190 RhoGAP in rat ovarian granulosa cells stimulated with follicle-stimulating hormone.","date":"2003","source":"Molecular endocrinology (Baltimore, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/12554790","citation_count":31,"is_preprint":false},{"pmid":"26740489","id":"PMC_26740489","title":"Caspr Controls the Temporal Specification of Neural Progenitor Cells through Notch Signaling in the Developing Mouse Cerebral Cortex.","date":"2017","source":"Cerebral cortex (New York, N.Y. : 1991)","url":"https://pubmed.ncbi.nlm.nih.gov/26740489","citation_count":30,"is_preprint":false},{"pmid":"27818385","id":"PMC_27818385","title":"Contactin-Associated Protein 1 (CNTNAP1) Mutations Induce Characteristic Lesions of the Paranodal Region.","date":"2016","source":"Journal of neuropathology and experimental neurology","url":"https://pubmed.ncbi.nlm.nih.gov/27818385","citation_count":29,"is_preprint":false},{"pmid":"12558984","id":"PMC_12558984","title":"Association of Caspr/paranodin with tumour suppressor schwannomin/merlin and beta1 integrin in the central nervous system.","date":"2003","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12558984","citation_count":29,"is_preprint":false},{"pmid":"12521212","id":"PMC_12521212","title":"Philadelphia chromosome-positive chronic myeloid leukemia expressing p190(BCR-ABL).","date":"2002","source":"Internal medicine (Tokyo, Japan)","url":"https://pubmed.ncbi.nlm.nih.gov/12521212","citation_count":29,"is_preprint":false},{"pmid":"1718405","id":"PMC_1718405","title":"HLA polymorphism and T cell recognition of a conserved region of p190, a malaria vaccine candidate.","date":"1991","source":"International immunology","url":"https://pubmed.ncbi.nlm.nih.gov/1718405","citation_count":29,"is_preprint":false},{"pmid":"28374019","id":"PMC_28374019","title":"CNTNAP1 mutations cause CNS hypomyelination and neuropathy with or without arthrogryposis.","date":"2017","source":"Neurology. Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/28374019","citation_count":28,"is_preprint":false},{"pmid":"20530197","id":"PMC_20530197","title":"The anaphase-promoting complex/cyclosome activator Cdh1 modulates Rho GTPase by targeting p190 RhoGAP for degradation.","date":"2010","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/20530197","citation_count":28,"is_preprint":false},{"pmid":"1847983","id":"PMC_1847983","title":"Establishment of a lymphoblastoid cell line, SD-1, expressing the p190 bcr-abl chimaeric protein.","date":"1991","source":"Leukemia","url":"https://pubmed.ncbi.nlm.nih.gov/1847983","citation_count":28,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50787,"output_tokens":5770,"usd":0.119456,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14418,"output_tokens":3777,"usd":0.083257,"stage2_stop_reason":"end_turn"},"total_usd":0.202713,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"Caspr (CNTNAP1) is an axonal transmembrane glycoprotein homologous to Drosophila Neurexin IV that localizes specifically to the septate-like paranodal junctions between axons and paranodal loops of myelinating glia, as demonstrated by immunoelectron microscopy. Caspr is resistant to nonionic detergent extraction, indicating association with the axon cytoskeleton at these junctions.\",\n      \"method\": \"Immunoelectron microscopy, detergent extraction, immunofluorescence on myelinating cultures and peripheral/central nervous system tissue\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization by immunoelectron microscopy replicated in multiple tissue contexts and in vitro, with functional implication established by detergent resistance assay\",\n      \"pmids\": [\"9396755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Caspr forms a cis complex with contactin in paranodal regions and juxtamesaxon. The two proteins co-extract, co-precipitate, and co-fractionate as a high-molecular-weight complex from neurons, myelinating cultures, and myelin preparations. A PI-PLC-resistant, lower-molecular-weight isoform of contactin is specifically associated with Caspr at paranodes, while a higher-molecular-weight contactin isoform at nodes is not Caspr-associated, indicating that Caspr determines the paranodal targeting of contactin. Blocking glial receptor RPTPβ inhibits paranodal targeting of the complex.\",\n      \"method\": \"Co-immunoprecipitation, sucrose gradient fractionation, cell surface biotinylation, myelinating coculture treatment with RPTPβ-Fc\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP and multiple biochemical methods across multiple preparation types, functional rescue/block experiment included\",\n      \"pmids\": [\"11069942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Genetic knockout of Caspr (NCP1) in mice abolishes normal paranodal junction formation, renders paranodal loops disorganized, causes contactin to become undetectable at paranodes, and displaces K+ channels from juxtaparanodal into paranodal domains. Loss of Caspr also severely reduces peripheral nerve conduction velocity. This demonstrates a critical role for Caspr in axonal domain delineation and saltatory conduction.\",\n      \"method\": \"Caspr knockout mouse model, immunofluorescence, immunoelectron microscopy, electrophysiology (nerve conduction velocity)\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with multiple orthogonal phenotypic readouts (ultrastructure, ion channel localization, electrophysiology), replicated across CNS and PNS\",\n      \"pmids\": [\"11395000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Surface transport of Caspr (paranodin) to the plasma membrane requires co-expression with the GPI-anchored adhesion molecule F3/contactin. Caspr is retained in the ER when transfected alone. Co-transfection with F3 delivers Caspr to the plasma membrane and recruits it into Triton X-100-insoluble lipid raft microdomains. The Ig domains of F3 mediate its association with Caspr, and both the GPI anchor and the fibronectin type III repeats of F3 are required cooperatively for this effect.\",\n      \"method\": \"Co-transfection in CHO and neuroblastoma cells, confocal microscopy, cell surface biotinylation, co-immunoprecipitation with F3 deletion constructs, detergent fractionation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (confocal, biotinylation, co-IP, fractionation) in single study with domain-mapping constructs\",\n      \"pmids\": [\"10769038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The glial isoform NF155 of neurofascin binds specifically to the Caspr–contactin axonal complex. The extracellular domain of NF155 binds to transfected cells expressing Caspr–contactin at the cell surface and pulls down the complex from brain lysates in vitro. NF155 antibodies and soluble NF155 extracellular domain inhibit myelination in cocultures, establishing NF155 as the glial receptor for the paranodal Caspr–contactin complex.\",\n      \"method\": \"Cell-based binding assay (transfected HEK cells), in vitro pulldown from brain lysates, myelinating coculture inhibition assay\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding demonstrated by two independent assays plus functional inhibition of myelination\",\n      \"pmids\": [\"11839274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The cytoplasmic domain of Caspr is required for retention of the Caspr–contactin complex at paranodal junctions. Transgenic mice expressing a Caspr mutant lacking its intracellular domain show the truncated protein mislocated within the axon rather than at the junctional axolemma. A short sequence in the cytoplasmic domain mediates binding to the cytoskeletal protein 4.1B. Clustering of contactin on the cell surface induces coclustering of Caspr and immobilized 4.1B at the plasma membrane, and deletion of the 4.1B-binding site accelerates internalization of a Caspr–contactin chimera.\",\n      \"method\": \"Transgenic mouse rescue experiments, immunoelectron microscopy, co-immunoprecipitation, cell clustering assay, internalization assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including in vivo transgenic rescue and cell-based functional assays\",\n      \"pmids\": [\"12082082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Caspr regulates the intracellular processing of contactin. Coexpression of Caspr with contactin during biosynthesis produces a low-molecular-weight, endoglycosidase H-sensitive contactin isoform that remains at the cell surface associated with Caspr but is unable to bind NF155. NF155 binds directly to contactin alone, but this interaction is inhibited when Caspr is co-expressed. Genetic deletion of Caspr in mice shifts contactin from the LMw to the HMw glycoform.\",\n      \"method\": \"Co-transfection, endoglycosidase H digestion, co-immunoprecipitation, Caspr-null mouse analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical mechanism defined in vitro and validated by in vivo knockout, multiple orthogonal methods\",\n      \"pmids\": [\"14676309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The conserved intracellular juxtamembrane GNP motif of Caspr/paranodin binds FERM-domain-containing proteins 4.1R and 4.1B. Protein 4.1B co-immunoprecipitates with Caspr in brain homogenates and accumulates progressively at paranodes during postnatal development, following the developmental concentration of Caspr at paranodes in both central and peripheral myelinated axons.\",\n      \"method\": \"GST pulldown, co-immunoprecipitation from brain homogenates, immunohistochemistry during postnatal development\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding (pulldown) confirmed by co-IP in brain and corroborated by in vivo developmental co-localization\",\n      \"pmids\": [\"12542678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Caspr's interaction with protein 4.1B via its cytoplasmic domain is required for efficient membrane barrier function at the paranodal junction (PNJ). Transgenic Caspr-d4.1 mutant lacking the 4.1-binding sequence localizes to the PNJ and recruits contactin and NF155, but Kv1 channels are aberrantly detected at paranodes, indicating that the Caspr–4.1B interaction is needed to exclude Kv1 channels from the paranodal domain.\",\n      \"method\": \"Transgenic rescue in Caspr-null mice, immunofluorescence, confocal microscopy\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo transgenic rescue experiment with domain-specific mutant, functional ion channel localization readout\",\n      \"pmids\": [\"20164332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The paranodal Caspr–F3/contactin complex traffics to the cell surface via a non-conventional Golgi-independent pathway. When Caspr is transfected alone, it is retained in the ER; ER retention is governed by the ectodomain. Cell surface delivery requires N-glycosylation and calnexin-mediated quality control. When complexed with F3, the glycoproteins are endoglycosidase H-sensitive and brefeldin A-insensitive at the cell surface, and recruited to lipid rafts.\",\n      \"method\": \"Brefeldin A treatment, EndoH digestion, N-glycosylation inhibition, lectin-chaperone (calnexin) analysis, confocal microscopy, chimeric construct analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal pharmacological and biochemical approaches defining a novel trafficking pathway\",\n      \"pmids\": [\"12972410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Nogo-A, an oligodendroglial protein concentrated at CNS paranodes, interacts directly with axonal Caspr in trans. CHO cells co-transfected with Caspr and F3 bind specifically to Nogo-66 peptide substrates, and this binding persists after PI-PLC removal of GPI-anchored F3, indicating a direct Nogo-66/Caspr interaction. Nogo-A and Caspr co-immunoprecipitate with Kv1.1 and Kv1.2 channels; in paranodal junction-defective pathological models, Nogo-A congregation is reduced and Kv1 channels shift toward paranodes.\",\n      \"method\": \"Cell-based binding assay with PI-PLC treatment, co-immunoprecipitation, immunofluorescence in pathological mouse models\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding shown by PI-PLC experiment and co-IP, but mechanistic link to K+ channel localization is correlative\",\n      \"pmids\": [\"14592966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Caspr/paranodin associates with the tumor suppressor schwannomin/merlin via the FERM domain of schwannomin binding to the Caspr GNP motif, and with β1 integrin. All three proteins co-immunoprecipitate from brain extracts. Caspr enhances the association between β1 integrin and schwannomin. In jimpy dysmyelinating mice with deficient paranodal junctions, interactions among these three proteins are profoundly altered.\",\n      \"method\": \"GST pulldown, co-immunoprecipitation from brain homogenates and transfected COS-7 cells, jimpy mouse analysis\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP confirmed in brain and in cells with domain mapping, but functional consequence of the interaction is not directly demonstrated\",\n      \"pmids\": [\"12558984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Caspr is required for structural integrity of calyceal synapses at vestibular hair cells and for clustering of KCNQ4 K+ channels at the postsynaptic membrane. In Caspr knockout mice, the separation between hair cell and afferent neuron membranes is irregularly increased, and KCNQ4 fails to cluster at the postsynaptic membrane, instead distributing diffusely along the calyceal membrane.\",\n      \"method\": \"Freeze-fracture electron microscopy, immunolabeling, Caspr knockout mouse analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with ultrastructural and molecular phenotypic readouts, multiple methods\",\n      \"pmids\": [\"19279247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A novel frameshift mutation in Caspr (shambling mouse) causing loss of transmembrane and cytoplasmic domains abolishes paranodal junction formation and causes axonal transport defects (large mitochondria, abnormal organelle accumulation at paranodes), reduced expression of Caspr, contactin, and NF155 at paranodes, aberrant localization of voltage-gated ion channels at the nodal/paranodal axolemma, and reduced saltatory conduction velocity.\",\n      \"method\": \"Positional cloning, immunohistochemistry, electron microscopy, electrophysiology in mutant mice\",\n      \"journal\": \"Journal of neuropathology and experimental neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with ultrastructural, molecular, and electrophysiological readouts in vivo\",\n      \"pmids\": [\"19816196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Cellular prion protein (PrP) directly binds Caspr and inhibits Reelin-mediated proteolytic shedding of Caspr from the neuronal cell surface. This increases surface Caspr levels and potentiates Caspr's inhibitory effect on neurite outgrowth. PrP-deficient neurons have reduced surface Caspr and enhanced neurite outgrowth in vitro; PrP-deficient mice show more efficient axon regeneration following spinal cord injury.\",\n      \"method\": \"Co-immunoprecipitation (direct binding of PrP to Caspr), neurite outgrowth assays, surface Caspr quantification, PrP knockout mouse analysis, in vivo spinal cord injury model\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding shown by co-IP, functional consequences demonstrated in vitro and in vivo, single study\",\n      \"pmids\": [\"20610764\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Homozygous frameshift mutations in CNTNAP1 in humans cause severe arthrogryposis multiplex congenita with markedly reduced motor nerve conduction velocity (<10 m/s) and transmission electron microscopy-confirmed severe abnormalities in nodes of Ranvier width and myelinated axon ultrastructure, establishing CNTNAP1/Caspr as essential for paranodal junction integrity and saltatory conduction in humans.\",\n      \"method\": \"Whole exome sequencing, nerve biopsy with transmission electron microscopy, nerve conduction studies, zebrafish morpholino knockdown\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human loss-of-function mutations with in vivo ultrastructural and electrophysiological validation across multiple unrelated families\",\n      \"pmids\": [\"24319099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Caspr4, in a coreceptor complex with contactin5/NB2 on proprioceptive sensory terminals, interacts with NrCAM/CHL1 on GABAergic spinal interneurons to direct high-density accumulation of inhibitory GABAergic boutons at sensory terminals. Genetic elimination of NB2 (contactin5) disproportionately strips inhibitory boutons from high-density GABApre-sensory synapses.\",\n      \"method\": \"Genetic knockout (NB2-null mice), immunofluorescence, synaptic density quantification in spinal cord\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — this paper concerns Caspr4, not CNTNAP1/Caspr1; included because it demonstrates related complex biology but finding is attributed to Caspr4 not Caspr1 — NOTE: reclassifying as out of scope for CNTNAP1 specifically\",\n      \"pmids\": [\"24411736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Both Caspr and Caspr2 are required for the radial organization of Kv1 channels along the inner mesaxon and circumferential ring in peripheral myelinated axons. In mice lacking both Caspr and Caspr2, Kv1 channels form large aggregates dispersed along the axolemma rather than clustered at the internodal line. Additionally, deletion of both proteins causes widening of nodes of Ranvier, showing that Caspr2 (present at paranodes in Caspr-null mice) can partially compensate for Caspr's barrier function.\",\n      \"method\": \"Double-knockout mouse generation (caspr-/-/caspr2-/-), immunofluorescence, confocal microscopy\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — double genetic knockout with clear molecular phenotype, demonstrates non-redundant and compensatory roles\",\n      \"pmids\": [\"25378149\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CNTNAP1 mutations in humans produce characteristic ultrastructural lesions: absence of transverse bands at paranodal axoglial junctions, loss of attachment between myelin loops and axolemma, and elongated Schwann cell processes dissociating the membranes at the node of Ranvier—lesions exclusively in the region where Caspr-1 is located, recapitulating caspr-1-null mouse pathology.\",\n      \"method\": \"Nerve biopsy with electron microscopy in compound heterozygous CNTNAP1 mutation patients, comparison with caspr-null mice\",\n      \"journal\": \"Journal of neuropathology and experimental neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human ultrastructural pathology directly linked to loss-of-function mutations, replicated across multiple patients and consistent with mouse knockout data\",\n      \"pmids\": [\"27818385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Caspr is expressed by radial glial neural progenitor cells and controls the temporal specification of neuronal versus astrocyte fate in the developing mouse cerebral cortex. Loss of Caspr delays neuronal production and induces precocious astrogenesis. At the molecular level, Caspr cooperates with the intracellular domain of Notch to repress transcription of the Notch effector Hes1. ShRNA knockdown of Hes1 rescues the abnormal neurogenesis and astrogenesis in Caspr-deficient mice.\",\n      \"method\": \"Caspr knockout mouse analysis, in utero electroporation, immunofluorescence, shRNA knockdown of Hes1, transcriptional reporter assays\",\n      \"journal\": \"Cerebral cortex\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function with epistasis rescue (Hes1 shRNA), single lab study\",\n      \"pmids\": [\"26740489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"During myelination, NF155 on oligodendrocyte processes acts as the glial partner responsible for paranodal Caspr distribution: Caspr is recruited to the cell surface at the axon–oligodendrocyte contact zone, where it undergoes a helical distribution that mirrors the turns of the overlying myelin sheath, consistent with trans-interaction with NF155 tracking the spiraling membrane.\",\n      \"method\": \"Time-lapse imaging and immunofluorescence in myelinating cultures, developmental time-course analysis\",\n      \"journal\": \"Journal of neuroscience research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — live imaging and correlative localization in myelinating cultures, no direct binding assay in this paper but consistent with other studies\",\n      \"pmids\": [\"19170162\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CNTNAP1/Caspr is an axonal transmembrane glycoprotein that forms a cis complex with contactin (which is required for its surface delivery and lipid raft recruitment) at paranodal junctions, where it interacts in trans with the glial receptor NF155; the cytoplasmic domain of Caspr anchors this complex to the axon cytoskeleton via protein 4.1B, and this interaction is essential for generating an efficient membrane diffusion barrier at the paranode that restricts ion channels to their correct axonal domains and enables saltatory nerve conduction; additionally, Caspr regulates contactin glycoform processing, participates in myelination-independent functions including neural progenitor temporal fate specification via Notch/Hes1 signaling, and its loss-of-function in humans and mice causes severe hypomyelinating neuropathy with paranodal ultrastructural defects.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CNTNAP1 (Caspr/paranodin) is an axonal transmembrane glycoprotein that builds and maintains the septate-like paranodal axoglial junction required for saltatory nerve conduction [#0, #2]. At the paranode it forms a cis complex with the GPI-anchored adhesion molecule contactin (F3), which is required to release Caspr from the ER, deliver it to the cell surface via a non-conventional Golgi-independent pathway, and recruit it into lipid raft microdomains [#3, #9]; reciprocally, Caspr governs contactin glycoform processing, generating a low-molecular-weight paranodal isoform [#6]. The surface Caspr-contactin complex engages the glial neurofascin isoform NF155 in trans, the interaction that drives paranodal assembly during myelination [#4, #20]. The cytoplasmic juxtamembrane GNP motif of Caspr anchors the complex to the axonal cytoskeleton through the FERM-domain protein 4.1B (and 4.1R), and this linkage retains the complex at the junctional axolemma and establishes the membrane diffusion barrier that excludes Kv1 channels from the paranode and keeps nodal/juxtaparanodal domains properly partitioned [#5, #7, #8]. Genetic loss of Caspr in mice abolishes paranodal junction formation, mislocalizes K+ channels, and slows nerve conduction, with Caspr2 able to partially compensate for its barrier function [#2, #17]. Beyond myelination, Caspr supports calyceal synapse integrity and KCNQ4 clustering at vestibular hair cells [#12] and, in radial glial progenitors, cooperates with the Notch intracellular domain to repress Hes1 and control the temporal switch from neurogenesis to astrogenesis [#19]. In humans, homozygous and compound heterozygous CNTNAP1 loss-of-function mutations cause severe hypomyelinating neuropathy with arthrogryposis multiplex congenita, markedly reduced motor nerve conduction, and paranodal ultrastructural lesions that recapitulate the mouse knockout [#15, #18].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing where Caspr resides defined the structural problem it solves: it is an axonal glycoprotein concentrated at the septate-like paranodal junction and tethered to the cytoskeleton there.\",\n      \"evidence\": \"Immunoelectron microscopy and detergent-extraction assays on myelinating cultures and nervous tissue\",\n      \"pmids\": [\"9396755\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No binding partners identified at this stage\", \"Functional role inferred from localization, not tested\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identifying contactin as both a binding partner and a trafficking chaperone answered how Caspr reaches the cell surface and is targeted to the paranode.\",\n      \"evidence\": \"Co-IP, sucrose gradient fractionation, surface biotinylation in neurons/myelin, plus co-transfection with F3 deletion constructs showing ER retention rescue and lipid raft recruitment\",\n      \"pmids\": [\"11069942\", \"10769038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Glial trans-receptor for the complex not yet identified\", \"Mechanism of paranodal vs nodal isoform sorting incompletely defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Genetic knockout demonstrated that Caspr is causally required for paranodal junction formation, ion channel partitioning, and saltatory conduction, not merely a marker.\",\n      \"evidence\": \"Caspr-null mouse with immunofluorescence, immunoEM, and nerve conduction velocity measurement\",\n      \"pmids\": [\"11395000\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of barrier function not yet dissected\", \"Cytoplasmic vs ectodomain contributions unresolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defining NF155 as the glial receptor and the cytoplasmic domain plus 4.1B as the cytoskeletal anchor explained how the complex is held in trans at the junction and retained at the axolemma.\",\n      \"evidence\": \"Cell-based binding and brain-lysate pulldown for NF155, coculture myelination inhibition; transgenic cytoplasmic-domain-deletion rescue and clustering/internalization assays for 4.1B\",\n      \"pmids\": [\"11839274\", \"12082082\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether 4.1B linkage specifically gates ion channel exclusion not yet shown\", \"Stoichiometry of trans complex unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"A cluster of biochemical studies resolved the trafficking pathway, the reciprocal control of contactin glycoforms, the 4.1R/4.1B-binding GNP motif, and additional cytoplasmic partners (schwannomin/merlin, beta1 integrin) and an axonal trans-partner (Nogo-A).\",\n      \"evidence\": \"Brefeldin A/EndoH/N-glycosylation/calnexin analyses, EndoH and Caspr-null glycoform analysis, GST pulldown and brain co-IP, PI-PLC binding assays\",\n      \"pmids\": [\"12972410\", \"14676309\", \"12542678\", \"12558984\", \"14592966\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of merlin/integrin association not directly demonstrated [#11]\", \"Nogo-A link to Kv1 channel positioning is correlative [#10]\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Separating the 4.1B-binding sequence from the rest of Caspr showed that the cytoskeletal linkage—rather than complex assembly per se—is what creates the diffusion barrier excluding Kv1 channels.\",\n      \"evidence\": \"Transgenic Caspr-d4.1 rescue in Caspr-null mice with ion channel immunofluorescence\",\n      \"pmids\": [\"20164332\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biophysical nature of the diffusion barrier not directly measured\", \"Whether 4.1B alone is sufficient for barrier formation unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Myelination-independent and live-imaging studies extended Caspr's role to calyceal synapse integrity/KCNQ4 clustering and revealed NF155-tracked helical Caspr distribution during paranode assembly.\",\n      \"evidence\": \"Caspr-null freeze-fracture EM and KCNQ4 immunolabeling; shambling frameshift mutant phenotyping; time-lapse myelinating culture imaging\",\n      \"pmids\": [\"19279247\", \"19816196\", \"19170162\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of KCNQ4 clustering by Caspr not defined\", \"Direct NF155 binding not assayed in the imaging study [#20]\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Human genetics established CNTNAP1 as a disease gene, showing that loss of function causes severe congenital hypomyelinating neuropathy and arthrogryposis with paranodal pathology mirroring the mouse.\",\n      \"evidence\": \"Whole exome sequencing of multiple families, nerve biopsy TEM, nerve conduction studies, zebrafish morpholino knockdown\",\n      \"pmids\": [\"24319099\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genotype-phenotype correlation across mutation types not fully resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Double knockout revealed that Caspr2 partially compensates for Caspr's barrier function and that both are required for radial Kv1 channel organization in peripheral axons.\",\n      \"evidence\": \"caspr-/-/caspr2-/- double-knockout mice with immunofluorescence\",\n      \"pmids\": [\"25378149\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of Caspr2 compensation unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"A developmental role was uncovered in which Caspr controls the neurogenesis-to-astrogenesis switch in cortical progenitors through Notch/Hes1 repression, distinct from its paranodal function.\",\n      \"evidence\": \"Caspr-null mice, in utero electroporation, Hes1 shRNA epistasis rescue, transcriptional reporters\",\n      \"pmids\": [\"26740489\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab study\", \"How a junctional adhesion protein engages Notch signaling mechanistically is unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How Caspr's diverse functions—paranodal barrier formation, contactin glycoform control, synaptic ion channel clustering, and Notch-dependent progenitor fate—are coordinated and whether they share a unifying biochemical mechanism remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of the trans complex\", \"Mechanism connecting cytoplasmic signaling roles to the adhesion ectodomain undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 2, 4]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 7, 8]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [5, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 3, 9]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [3, 9]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [19]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [2, 12]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [19]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [15, 18]}\n    ],\n    \"complexes\": [\"Caspr-contactin paranodal complex\", \"paranodal axoglial junction\"],\n    \"partners\": [\"CNTN1\", \"NFASC\", \"EPB41L3\", \"EPB41\", \"NLGN\", \"NF155\", \"PRNP\", \"RTN4\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}