{"gene":"CNTNAP1","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":1997,"finding":"Caspr (CNTNAP1) is a transmembrane glycoprotein homologous to Neurexin IV that localizes specifically to paranodal septate-like junctions between axons and myelinating glia, where it is poorly extracted by nonionic detergents, indicating association with the axon cytoskeleton at these junctions.","method":"Immunoelectron microscopy, detergent extraction, immunofluorescence in myelinating cultures and tissue","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — direct localization by immunoelectron microscopy with functional context, replicated across multiple preparations","pmids":["9396755"],"is_preprint":false},{"year":2000,"finding":"Caspr forms a cis complex with contactin in paranodal regions; contactin is required to target the Caspr/contactin complex to paranodal junctions via extracellular interactions with myelinating glia, and treatment with RPTPbeta-Fc blocks paranodal localization of the complex.","method":"Co-immunoprecipitation, co-extraction from neurons and myelin preparations, sucrose gradient fractionation, myelinating coculture perturbation assay","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP plus functional perturbation in cocultures, multiple orthogonal methods","pmids":["11069942"],"is_preprint":false},{"year":2000,"finding":"Caspr requires association with F3/contactin (a GPI-anchored adhesion molecule) for surface transport; Caspr is retained in the endoplasmic reticulum when transfected alone, and F3 co-expression promotes plasma membrane delivery and recruitment of Caspr into Triton X-100-insoluble lipid raft microdomains; the GPI anchor plus FNIII repeats and Ig domains of F3 are all required for this cooperative effect.","method":"Transfection in CHO and neuroblastoma cells, confocal microscopy, cell surface biotinylation, co-immunoprecipitation, lipid raft fractionation","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — reconstitution in heterologous cells with domain-deletion mapping and multiple biochemical readouts","pmids":["10769038"],"is_preprint":false},{"year":2001,"finding":"Mice lacking Caspr (NCP1) fail to form normal paranodal junctions; contactin is undetectable at paranodes, K+ channels are displaced from juxtaparanodal into paranodal domains, and peripheral nerve conduction velocity is severely reduced, establishing Caspr as essential for axonal domain organization and saltatory conduction.","method":"Caspr knockout mouse, immunofluorescence, electrophysiology, electron microscopy","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 — clean KO with multiple defined cellular and physiological phenotypes, widely replicated","pmids":["11395000"],"is_preprint":false},{"year":2002,"finding":"The extracellular domain of the glial isoform neurofascin NF155 binds specifically to the axonal Caspr/paranodin-contactin complex on transfected cells and from brain lysates in vitro; NF155 antibodies and its extracellular domain inhibit myelination in cocultures, establishing NF155 as the glial receptor for the Caspr-contactin axoglial complex.","method":"Cell binding assay (transfected cells), in vitro pull-down from brain lysates, myelinating coculture inhibition assay","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 — direct binding assay plus functional myelination inhibition, multiple orthogonal methods","pmids":["11839274"],"is_preprint":false},{"year":2002,"finding":"The cytoplasmic domain of Caspr is required for retention of the Caspr-contactin complex at the paranodal junction; a short sequence in the cytoplasmic domain mediates binding to the cytoskeletal protein 4.1B, and deletion of this 4.1B-binding site accelerates internalization of a Caspr-contactin chimera from the cell surface.","method":"Transgenic mouse rescue experiments, immunoelectron microscopy, co-clustering assays, internalization assay in transfected cells","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — in vivo transgenic complementation plus cell-based domain-deletion and internalization assays","pmids":["12082082"],"is_preprint":false},{"year":2003,"finding":"Caspr inhibits NF155 binding to contactin by associating with contactin during biosynthesis and directing expression of a low-molecular-weight, endoglycosidase H-sensitive isoform of contactin at the cell membrane; deletion of Caspr in mice shifts contactin from the LMw to the HMw glycoform, demonstrating that Caspr regulates contactin processing and transport.","method":"Co-expression in transfected cells, endoglycosidase H sensitivity assay, Caspr knockout mouse, binding assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — biochemical reconstitution with glycoform analysis plus in vivo genetic validation","pmids":["14676309"],"is_preprint":false},{"year":2003,"finding":"The conserved intracellular juxtamembrane GNP motif of Caspr/paranodin binds protein 4.1B (and 4.1R); 4.1B co-immunoprecipitates with Caspr in brain homogenates and accumulates progressively at paranodes during postnatal development, linking Caspr to the actin-based cytoskeleton.","method":"GST pull-down, co-immunoprecipitation from brain, immunofluorescence during postnatal development","journal":"The European journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP from brain plus domain-mapping pull-down","pmids":["12542678"],"is_preprint":false},{"year":2003,"finding":"The paranodal Caspr-F3/contactin complex traffics to the cell surface via a non-conventional, Golgi-independent (brefeldin A-insensitive) pathway; N-glycosylation and calnexin-mediated quality control in the ER are required for surface delivery, and the ectodomain of Caspr mediates ER retention when expressed alone.","method":"Brefeldin A treatment, endoglycosidase H sensitivity, calnexin interaction assay, truncation mutants in transfected neuroblastoma cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — pharmacological and biochemical dissection of trafficking pathway with domain-deletion mapping","pmids":["12972410"],"is_preprint":false},{"year":2003,"finding":"Nogo-A, an oligodendroglial protein, localizes to paranodes and interacts in trans with axonal Caspr at CNS paranodes; CHO cells co-transfected with Caspr and F3 (but not F3 alone) bind specifically to Nogo-66-coated substrates, and this binding persists after PI-PLC removal of GPI-linked F3, indicating a direct Nogo-66/Caspr interaction. Nogo-A and Caspr both co-immunoprecipitate with Kv1 channels, implicating this interaction in K+ channel localization.","method":"Cell binding assay with transfected CHO cells, PI-PLC treatment, co-immunoprecipitation, immunofluorescence in pathological mouse models","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 3 — single-lab binding assay plus co-IP; functional consequence inferred from pathological models","pmids":["14592966"],"is_preprint":false},{"year":2003,"finding":"Caspr/paranodin associates with the tumor suppressor schwannomin/merlin through binding of the schwannomin FERM domain to the Caspr GNP motif; the two proteins co-immunoprecipitate from brain extracts and are both associated with integrin beta1, with Caspr increasing the schwannomin-integrin beta1 association.","method":"GST pull-down, co-immunoprecipitation from brain and transfected cells, dysmyelinated (jimpy) mouse model","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 3 — GST pull-down plus reciprocal co-IP from brain, single lab","pmids":["12558984"],"is_preprint":false},{"year":2009,"finding":"Caspr is required for the structural integrity of calyceal synaptic junctions at vestibular hair cells and for clustering of the K+ channel KCNQ4 at the postsynaptic membrane; Caspr knockout mice show irregular membrane separation at calyceal synapses and diffuse KCNQ4 distribution.","method":"Caspr knockout mouse, freeze-fracture electron microscopy, immunolabeling, ultrastructural analysis","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — clean KO with ultrastructural and molecular phenotype at a defined synapse","pmids":["19279247"],"is_preprint":false},{"year":2009,"finding":"A truncating shambling (shm) mutation in Caspr (frameshift causing loss of transmembrane and cytoplasmic domains) disrupts paranodal junctions, causes aberrant localization of voltage-gated ion channels, reduces expression of contactin and neurofascin-155, and reduces saltatory conduction velocity, confirming transmembrane/cytoplasmic domain necessity for Caspr paranodal function.","method":"Positional cloning, immunohistochemistry, electron microscopy, electrophysiology in mutant mice","journal":"Journal of neuropathology and experimental neurology","confidence":"High","confidence_rationale":"Tier 2 — naturally occurring mutation with defined molecular lesion and multiple phenotypic readouts","pmids":["19816196"],"is_preprint":false},{"year":2010,"finding":"Caspr interaction with protein 4.1B is required for the generation of an efficient membrane barrier at the paranodal junction; Caspr mutants lacking the 4.1B-binding sequence (Caspr-d4.1) localize to the paranodal junction and recruit contactin and NF155, but fail to exclude Kv1 channels from paranodes, demonstrating that the Caspr-4.1B interaction is necessary for the barrier function.","method":"Transgenic rescue of Caspr-null mice with d4.1 mutant, immunofluorescence","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — in vivo transgenic complementation with separation-of-function mutant","pmids":["20164332"],"is_preprint":false},{"year":2010,"finding":"Cellular prion protein (PrP) directly binds to Caspr and inhibits Reelin-mediated proteolytic shedding of Caspr from the neuronal cell surface; increased surface Caspr potentiates Caspr-mediated inhibition of neurite outgrowth, while PrP deficiency reduces surface Caspr and enhances neurite outgrowth and axon regeneration in vivo.","method":"Co-immunoprecipitation, cell surface Caspr quantification, neurite outgrowth assay, spinal cord injury model in PrP-deficient mice","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP plus functional in vitro and in vivo assays, single lab","pmids":["20610764"],"is_preprint":false},{"year":2013,"finding":"Homozygous frameshift mutations in CNTNAP1 cause a severe form of arthrogryposis multiplex congenita with markedly reduced motor nerve conduction velocity (<10 m/s) and electron microscopy-confirmed severe abnormalities at nodes of Ranvier and myelinated axons in patients, establishing CNTNAP1 as essential for paranodal domain organization and saltatory conduction in humans.","method":"Whole exome sequencing, transmission electron microscopy of sciatic nerve biopsy, nerve conduction studies","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — human genetics with direct ultrastructural validation in four unrelated families","pmids":["24319099"],"is_preprint":false},{"year":2014,"finding":"Caspr and Caspr2 together are required for both radial (mesaxonal internodal line) and longitudinal (nodal domain) organization of the axolemma; double Caspr/Caspr2 null mice show dispersed Kv1 channel aggregates along the axolemma and widened nodes of Ranvier, revealing compensatory roles of the two proteins.","method":"Double knockout mouse generation, immunofluorescence, electron microscopy","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — double KO with clear separation of functions and multiple phenotypic readouts","pmids":["25378149"],"is_preprint":false},{"year":2016,"finding":"CNTNAP1 mutations in patients cause characteristic ultrastructural lesions at paranodes: absence of transverse bands, loss of myelin loop-axolemma attachment, and hypomyelination; these lesions are identical to those in Caspr-null mice, confirming the essential role of CNTNAP1 in forming transverse bands that stabilize paranodal axo-glial junctions in humans.","method":"Nerve biopsy with electron microscopy in patients with compound heterozygous CNTNAP1 mutations","journal":"Journal of neuropathology and experimental neurology","confidence":"High","confidence_rationale":"Tier 2 — direct ultrastructural phenotyping in human patients with genetically confirmed mutations","pmids":["27818385"],"is_preprint":false},{"year":2017,"finding":"Caspr is expressed by radial glial neural progenitor cells in the developing cerebral cortex and regulates the timing of neuron versus astrocyte generation; Caspr-deficient mice show delayed neuronal production and premature astrogenesis. Caspr cooperates with the intracellular domain of Notch to repress Hes1 transcription, and shRNA knockdown of Hes1 rescues the progenitor specification defect.","method":"Caspr knockout mouse, in utero electroporation, Hes1 shRNA rescue, BrdU labeling, gene expression analysis","journal":"Cerebral cortex","confidence":"Medium","confidence_rationale":"Tier 2 — KO phenotype plus mechanistic rescue with shRNA, single lab","pmids":["26740489"],"is_preprint":false},{"year":2017,"finding":"CNTNAP1 mutations cause severe CNS hypomyelinating leukodystrophy and peripheral neuropathy with or without arthrogryposis; nerve biopsy shows lack of paranodal transverse bands and widened paranodal junctional gaps, consistent with CNTNAP1's role in paranodal junction formation.","method":"Whole-exome sequencing, MRI, nerve biopsy with electron microscopy, neurophysiology in patients from two unrelated families","journal":"Neurology. Genetics","confidence":"High","confidence_rationale":"Tier 2 — human genetic validation with direct ultrastructural evidence across multiple families","pmids":["28374019"],"is_preprint":false}],"current_model":"CNTNAP1 (Caspr) is an axonal transmembrane glycoprotein of the neurexin superfamily that forms a cis complex with contactin (requiring F3/contactin for ER exit and lipid raft-mediated plasma membrane delivery), localizes to paranodal septate-like junctions between axons and myelinating glia via trans-interaction with glial NF155, anchors the paranodal adhesion complex to the axon cytoskeleton through its cytoplasmic domain binding to protein 4.1B, regulates contactin glycoprocessing, establishes a membrane diffusion barrier that restricts Kv1 channels to the juxtaparanodal domain, and is required for saltatory conduction; loss-of-function mutations cause severe hypomyelination and paranodal ultrastructural defects in both mice and humans."},"narrative":{"teleology":[{"year":1997,"claim":"The identity and localization of the axonal component of paranodal septate-like junctions was unknown; immunoelectron microscopy identified Caspr (CNTNAP1) as a transmembrane glycoprotein concentrated specifically at these junctions and associated with the axon cytoskeleton, establishing the first molecular handle on paranodal organization.","evidence":"Immunoelectron microscopy, detergent extraction, and immunofluorescence in myelinating cultures and sciatic nerve tissue","pmids":["9396755"],"confidence":"High","gaps":["No functional consequence of Caspr loss was known","Binding partners on the glial side were unidentified","Mechanism of Caspr targeting to paranodes was unknown"]},{"year":2000,"claim":"How Caspr reaches the cell surface and is targeted to paranodes was unclear; reconstitution experiments showed that Caspr is retained in the ER when expressed alone and requires cis association with the GPI-anchored molecule contactin (F3) for plasma membrane delivery via lipid raft microdomains, establishing the obligate heteromeric nature of the complex.","evidence":"Transfection in CHO and neuroblastoma cells, surface biotinylation, lipid raft fractionation, co-immunoprecipitation, and myelinating coculture perturbation","pmids":["10769038","11069942"],"confidence":"High","gaps":["The glial trans-binding partner was still unidentified","In vivo loss-of-function had not been tested","The trafficking route beyond ER exit was not defined"]},{"year":2001,"claim":"Whether Caspr is essential for nerve function in vivo was untested; Caspr knockout mice showed complete failure of paranodal junction formation, displacement of Kv1 channels into paranodal regions, and severely reduced conduction velocity, proving Caspr is indispensable for axonal domain organization and saltatory conduction.","evidence":"Caspr knockout mouse with immunofluorescence, electron microscopy, and electrophysiology","pmids":["11395000"],"confidence":"High","gaps":["The mechanism of Kv1 channel exclusion (direct barrier vs. indirect) was not resolved","Cytoplasmic anchoring mechanism was not addressed","Human disease relevance was not yet established"]},{"year":2002,"claim":"The glial receptor completing the trans-paranodal adhesion complex was unknown; binding assays and myelination inhibition experiments identified neurofascin-155 (NF155) as the glial partner that directly interacts with the axonal Caspr–contactin complex, completing the molecular model of the paranodal junction.","evidence":"Cell binding assay with transfected cells, pull-down from brain lysates, myelinating coculture inhibition","pmids":["11839274"],"confidence":"High","gaps":["Structural basis of the NF155–Caspr/contactin interaction was unknown","Whether NF155 binding is sufficient for junction formation in vivo was not tested"]},{"year":2002,"claim":"How the paranodal complex is stabilized at the membrane was unclear; transgenic rescue and domain-deletion experiments showed that the Caspr cytoplasmic domain binds protein 4.1B via a conserved GNP motif and that this interaction prevents internalization, establishing the cytoskeletal anchor of the paranodal complex.","evidence":"Transgenic rescue in Caspr-null mice, co-clustering assays, internalization assays in transfected cells, co-immunoprecipitation from brain","pmids":["12082082","12542678"],"confidence":"High","gaps":["Whether 4.1B binding contributes to the Kv1 channel diffusion barrier was not separated from junction retention","Downstream cytoskeletal linkage to actin was inferred but not directly shown"]},{"year":2003,"claim":"The mechanism by which Caspr regulates its partner contactin was unknown; biochemical analysis revealed that Caspr directs expression of a low-molecular-weight, ER-type glycoform of contactin that cannot bind NF155, and that the Caspr–contactin complex traffics to the surface via a brefeldin A-insensitive, Golgi-independent pathway, explaining how Caspr controls both partner processing and the unconventional route to the paranodal membrane.","evidence":"Endoglycosidase H sensitivity assays, brefeldin A treatment, calnexin interaction, Caspr knockout mouse glycoform analysis, truncation mutants","pmids":["14676309","12972410"],"confidence":"High","gaps":["The identity of the non-conventional trafficking carrier was not determined","How NF155 binding is ultimately restored at the paranode after surface delivery was not explained"]},{"year":2003,"claim":"Whether Caspr has additional trans-binding partners beyond NF155 was open; cell binding assays suggested that oligodendroglial Nogo-A interacts directly with Caspr at paranodes and that Caspr also associates with schwannomin/merlin via its cytoplasmic GNP motif, expanding the potential signaling repertoire of Caspr.","evidence":"CHO cell binding to Nogo-66 substrates, co-immunoprecipitation, GST pull-down from brain","pmids":["14592966","12558984"],"confidence":"Medium","gaps":["Nogo-A–Caspr interaction was shown only in a single lab with overexpression","Functional consequence of schwannomin–Caspr binding at paranodes is undefined","Neither interaction has been validated genetically in vivo"]},{"year":2009,"claim":"Whether Caspr functions outside myelinated axons was unknown; analysis of Caspr-null mice revealed that Caspr is required for structural integrity of calyceal synaptic junctions at vestibular hair cells and for clustering of the K+ channel KCNQ4, while the shambling truncating mutation confirmed that the transmembrane and cytoplasmic domains are essential for all paranodal functions.","evidence":"Caspr knockout and shambling mutant mice, freeze-fracture EM, immunolabeling, electrophysiology","pmids":["19279247","19816196"],"confidence":"High","gaps":["Whether Caspr uses the same molecular partners (contactin, NF155) at vestibular synapses was not determined","Calyceal junction phenotype has not been linked to vestibular behavioral deficits"]},{"year":2010,"claim":"Whether the 4.1B-binding function of Caspr is separable from its junction-assembly function was untested; transgenic rescue with a Caspr mutant lacking only the 4.1B-binding site showed that this mutant localizes normally to paranodes and recruits contactin and NF155, but fails to exclude Kv1 channels, demonstrating that 4.1B anchoring specifically generates the paranodal diffusion barrier.","evidence":"Transgenic rescue of Caspr-null mice with Caspr-Δ4.1 mutant, immunofluorescence","pmids":["20164332"],"confidence":"High","gaps":["The biophysical mechanism by which 4.1B creates the diffusion barrier is unknown","Whether other 4.1 family members partially compensate was not tested"]},{"year":2013,"claim":"Whether CNTNAP1 loss causes human disease was unresolved; whole-exome sequencing in four unrelated families identified homozygous frameshift CNTNAP1 mutations causing severe arthrogryposis multiplex congenita with profoundly reduced nerve conduction and ultrastructural paranodal defects identical to Caspr-null mice, establishing a direct human disease link.","evidence":"Whole-exome sequencing, transmission electron microscopy of nerve biopsy, nerve conduction studies in patients","pmids":["24319099"],"confidence":"High","gaps":["Genotype–phenotype correlation across different mutation types was limited","Whether any residual Caspr function exists in hypomorphic alleles was unknown"]},{"year":2014,"claim":"The relationship between Caspr and Caspr2 in axolemmal organization was unclear; double knockout mice revealed that the two proteins together maintain both radial (internodal) and longitudinal (nodal) organization, with compensatory masking of some defects in single knockouts.","evidence":"Caspr/Caspr2 double knockout mouse, immunofluorescence, electron microscopy","pmids":["25378149"],"confidence":"High","gaps":["Molecular basis of radial domain organization by Caspr is unknown","Whether Caspr and Caspr2 interact physically was not addressed"]},{"year":2017,"claim":"An unexpected developmental role for Caspr was identified: Caspr is expressed in cortical radial glia and cooperates with the Notch intracellular domain to repress Hes1 transcription, thereby regulating the timing of neuron-to-astrocyte fate switching during cortical development.","evidence":"Caspr knockout mouse, in utero electroporation, Hes1 shRNA rescue, BrdU labeling","pmids":["26740489"],"confidence":"Medium","gaps":["This role is from a single lab and has not been independently replicated","How a paranodal adhesion molecule accesses nuclear Notch signaling is mechanistically unexplained","Whether CNTNAP1 patient mutations affect cortical development was not examined"]},{"year":null,"claim":"Key unresolved questions include: the structural basis of the Caspr–contactin–NF155 ternary complex, the biophysical mechanism by which the Caspr–4.1B interaction creates a membrane diffusion barrier, the identity of the non-conventional trafficking carrier used by the Caspr–contactin complex, and the full genotype–phenotype spectrum of CNTNAP1 mutations in humans.","evidence":"","pmids":[],"confidence":"High","gaps":["No atomic-resolution structure of the paranodal complex exists","Mechanism of diffusion barrier formation is entirely unknown at the biophysical level","The non-conventional ER-to-surface pathway has not been molecularly defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,1,4,5]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[5,7,13]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1,2,3]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[2,8]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,5,7]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[3,11,12,15]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[0,4,5,17]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[18]}],"complexes":["Caspr–contactin paranodal complex","Caspr–contactin–NF155 axoglial junction complex"],"partners":["CNTN1","NFASC","EPB41L3","NF2","PRNP","RTN4"],"other_free_text":[]},"mechanistic_narrative":"CNTNAP1 (Caspr) is a transmembrane glycoprotein of the neurexin superfamily that serves as the central axonal organizer of paranodal septate-like junctions, establishing the membrane diffusion barrier required for saltatory nerve conduction. CNTNAP1 forms a cis complex with contactin (F3), which is required for its exit from the endoplasmic reticulum and delivery to the plasma membrane via a non-conventional, Golgi-independent pathway; CNTNAP1 in turn regulates contactin glycoprocessing and restricts its ability to bind the glial receptor neurofascin-155 (NF155), which mediates trans-axoglial adhesion at paranodes [PMID:10769038, PMID:14676309, PMID:11839274, PMID:12972410]. The cytoplasmic domain of CNTNAP1 binds protein 4.1B through a conserved GNP motif, anchoring the paranodal complex to the actin cytoskeleton; this interaction is specifically required not for paranodal localization itself but for generating the barrier that excludes Kv1 potassium channels from the paranode into the juxtaparanodal domain [PMID:12082082, PMID:20164332]. Loss-of-function mutations in CNTNAP1 cause a severe human disorder featuring arthrogryposis multiplex congenita, hypomyelinating leukodystrophy, and profoundly reduced nerve conduction velocity, with ultrastructural absence of paranodal transverse bands identical to those seen in Caspr-null mice [PMID:24319099, PMID:27818385]."},"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 many","driving_tissues":[{"tissue":"brain","ntpm":72.7}],"url":"https://www.proteinatlas.org/search/CNTNAP1"},"hgnc":{"alias_symbol":["p190","Caspr","CNTNAP"],"prev_symbol":["NRXN4"]},"alphafold":{"accession":"P78357","domains":[{"cath_id":"2.60.120.260","chopping":"25-170","consensus_level":"high","plddt":90.5962,"start":25,"end":170},{"cath_id":"2.60.120.200","chopping":"175-349","consensus_level":"high","plddt":89.1953,"start":175,"end":349},{"cath_id":"2.60.120.200","chopping":"364-536","consensus_level":"high","plddt":92.2255,"start":364,"end":536},{"cath_id":"2.60.120.1000","chopping":"625-781","consensus_level":"high","plddt":92.074,"start":625,"end":781},{"cath_id":"2.60.120.200","chopping":"788-959","consensus_level":"high","plddt":84.9119,"start":788,"end":959},{"cath_id":"2.60.120.200","chopping":"1003-1023_1079-1248","consensus_level":"high","plddt":84.5307,"start":1003,"end":1248}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P78357","model_url":"https://alphafold.ebi.ac.uk/files/AF-P78357-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P78357-F1-predicted_aligned_error_v6.png","plddt_mean":81.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CNTNAP1","jax_strain_url":"https://www.jax.org/strain/search?query=CNTNAP1"},"sequence":{"accession":"P78357","fasta_url":"https://rest.uniprot.org/uniprotkb/P78357.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P78357/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P78357"}},"corpus_meta":[{"pmid":"11395000","id":"PMC_11395000","title":"Axon-glia interactions and the domain organization of myelinated axons requires neurexin IV/Caspr/Paranodin.","date":"2001","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/11395000","citation_count":466,"is_preprint":false},{"pmid":"8940193","id":"PMC_8940193","title":"P210 and P190(BCR/ABL) induce the tyrosine phosphorylation and DNA binding activity of multiple specific STAT family members.","date":"1996","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/8940193","citation_count":410,"is_preprint":false},{"pmid":"10224280","id":"PMC_10224280","title":"The P190, P210, and P230 forms of the BCR/ABL oncogene induce a similar chronic myeloid leukemia-like syndrome in mice but have different lymphoid leukemogenic activity.","date":"1999","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/10224280","citation_count":408,"is_preprint":false},{"pmid":"1469047","id":"PMC_1469047","title":"Primary structure and cellular 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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":"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":"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":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},{"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":27,"is_preprint":false},{"pmid":"8639433","id":"PMC_8639433","title":"Progression from myelodysplastic syndrome to acute lymphoblastic leukaemia with Philadelphia chromosome and p190 BCR-ABL transcript.","date":"1996","source":"British journal of haematology","url":"https://pubmed.ncbi.nlm.nih.gov/8639433","citation_count":27,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49739,"output_tokens":4670,"usd":0.109633},"stage2":{"model":"claude-opus-4-6","input_tokens":8158,"output_tokens":3513,"usd":0.192922},"total_usd":0.302555,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"Caspr (CNTNAP1) is a transmembrane glycoprotein homologous to Neurexin IV that localizes specifically to paranodal septate-like junctions between axons and myelinating glia, where it is poorly extracted by nonionic detergents, indicating association with the axon cytoskeleton at these junctions.\",\n      \"method\": \"Immunoelectron microscopy, detergent extraction, immunofluorescence in myelinating cultures and tissue\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization by immunoelectron microscopy with functional context, replicated across multiple preparations\",\n      \"pmids\": [\"9396755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Caspr forms a cis complex with contactin in paranodal regions; contactin is required to target the Caspr/contactin complex to paranodal junctions via extracellular interactions with myelinating glia, and treatment with RPTPbeta-Fc blocks paranodal localization of the complex.\",\n      \"method\": \"Co-immunoprecipitation, co-extraction from neurons and myelin preparations, sucrose gradient fractionation, myelinating coculture perturbation assay\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP plus functional perturbation in cocultures, multiple orthogonal methods\",\n      \"pmids\": [\"11069942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Caspr requires association with F3/contactin (a GPI-anchored adhesion molecule) for surface transport; Caspr is retained in the endoplasmic reticulum when transfected alone, and F3 co-expression promotes plasma membrane delivery and recruitment of Caspr into Triton X-100-insoluble lipid raft microdomains; the GPI anchor plus FNIII repeats and Ig domains of F3 are all required for this cooperative effect.\",\n      \"method\": \"Transfection in CHO and neuroblastoma cells, confocal microscopy, cell surface biotinylation, co-immunoprecipitation, lipid raft fractionation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstitution in heterologous cells with domain-deletion mapping and multiple biochemical readouts\",\n      \"pmids\": [\"10769038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Mice lacking Caspr (NCP1) fail to form normal paranodal junctions; contactin is undetectable at paranodes, K+ channels are displaced from juxtaparanodal into paranodal domains, and peripheral nerve conduction velocity is severely reduced, establishing Caspr as essential for axonal domain organization and saltatory conduction.\",\n      \"method\": \"Caspr knockout mouse, immunofluorescence, electrophysiology, electron microscopy\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple defined cellular and physiological phenotypes, widely replicated\",\n      \"pmids\": [\"11395000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The extracellular domain of the glial isoform neurofascin NF155 binds specifically to the axonal Caspr/paranodin-contactin complex on transfected cells and from brain lysates in vitro; NF155 antibodies and its extracellular domain inhibit myelination in cocultures, establishing NF155 as the glial receptor for the Caspr-contactin axoglial complex.\",\n      \"method\": \"Cell binding assay (transfected cells), in vitro pull-down from brain lysates, myelinating coculture inhibition assay\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding assay plus functional myelination inhibition, multiple orthogonal methods\",\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 the paranodal junction; a short sequence in the cytoplasmic domain mediates binding to the cytoskeletal protein 4.1B, and deletion of this 4.1B-binding site accelerates internalization of a Caspr-contactin chimera from the cell surface.\",\n      \"method\": \"Transgenic mouse rescue experiments, immunoelectron microscopy, co-clustering assays, internalization assay in transfected cells\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vivo transgenic complementation plus cell-based domain-deletion and internalization assays\",\n      \"pmids\": [\"12082082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Caspr inhibits NF155 binding to contactin by associating with contactin during biosynthesis and directing expression of a low-molecular-weight, endoglycosidase H-sensitive isoform of contactin at the cell membrane; deletion of Caspr in mice shifts contactin from the LMw to the HMw glycoform, demonstrating that Caspr regulates contactin processing and transport.\",\n      \"method\": \"Co-expression in transfected cells, endoglycosidase H sensitivity assay, Caspr knockout mouse, binding assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — biochemical reconstitution with glycoform analysis plus in vivo genetic validation\",\n      \"pmids\": [\"14676309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The conserved intracellular juxtamembrane GNP motif of Caspr/paranodin binds protein 4.1B (and 4.1R); 4.1B co-immunoprecipitates with Caspr in brain homogenates and accumulates progressively at paranodes during postnatal development, linking Caspr to the actin-based cytoskeleton.\",\n      \"method\": \"GST pull-down, co-immunoprecipitation from brain, immunofluorescence during postnatal development\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP from brain plus domain-mapping pull-down\",\n      \"pmids\": [\"12542678\"],\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 (brefeldin A-insensitive) pathway; N-glycosylation and calnexin-mediated quality control in the ER are required for surface delivery, and the ectodomain of Caspr mediates ER retention when expressed alone.\",\n      \"method\": \"Brefeldin A treatment, endoglycosidase H sensitivity, calnexin interaction assay, truncation mutants in transfected neuroblastoma cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — pharmacological and biochemical dissection of trafficking pathway with domain-deletion mapping\",\n      \"pmids\": [\"12972410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Nogo-A, an oligodendroglial protein, localizes to paranodes and interacts in trans with axonal Caspr at CNS paranodes; CHO cells co-transfected with Caspr and F3 (but not F3 alone) bind specifically to Nogo-66-coated substrates, and this binding persists after PI-PLC removal of GPI-linked F3, indicating a direct Nogo-66/Caspr interaction. Nogo-A and Caspr both co-immunoprecipitate with Kv1 channels, implicating this interaction in K+ channel localization.\",\n      \"method\": \"Cell binding assay with transfected CHO cells, PI-PLC treatment, co-immunoprecipitation, immunofluorescence in pathological mouse models\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single-lab binding assay plus co-IP; functional consequence inferred from pathological models\",\n      \"pmids\": [\"14592966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Caspr/paranodin associates with the tumor suppressor schwannomin/merlin through binding of the schwannomin FERM domain to the Caspr GNP motif; the two proteins co-immunoprecipitate from brain extracts and are both associated with integrin beta1, with Caspr increasing the schwannomin-integrin beta1 association.\",\n      \"method\": \"GST pull-down, co-immunoprecipitation from brain and transfected cells, dysmyelinated (jimpy) mouse model\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — GST pull-down plus reciprocal co-IP from brain, single lab\",\n      \"pmids\": [\"12558984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Caspr is required for the structural integrity of calyceal synaptic junctions at vestibular hair cells and for clustering of the K+ channel KCNQ4 at the postsynaptic membrane; Caspr knockout mice show irregular membrane separation at calyceal synapses and diffuse KCNQ4 distribution.\",\n      \"method\": \"Caspr knockout mouse, freeze-fracture electron microscopy, immunolabeling, ultrastructural analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with ultrastructural and molecular phenotype at a defined synapse\",\n      \"pmids\": [\"19279247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A truncating shambling (shm) mutation in Caspr (frameshift causing loss of transmembrane and cytoplasmic domains) disrupts paranodal junctions, causes aberrant localization of voltage-gated ion channels, reduces expression of contactin and neurofascin-155, and reduces saltatory conduction velocity, confirming transmembrane/cytoplasmic domain necessity for Caspr paranodal function.\",\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 — naturally occurring mutation with defined molecular lesion and multiple phenotypic readouts\",\n      \"pmids\": [\"19816196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Caspr interaction with protein 4.1B is required for the generation of an efficient membrane barrier at the paranodal junction; Caspr mutants lacking the 4.1B-binding sequence (Caspr-d4.1) localize to the paranodal junction and recruit contactin and NF155, but fail to exclude Kv1 channels from paranodes, demonstrating that the Caspr-4.1B interaction is necessary for the barrier function.\",\n      \"method\": \"Transgenic rescue of Caspr-null mice with d4.1 mutant, immunofluorescence\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo transgenic complementation with separation-of-function mutant\",\n      \"pmids\": [\"20164332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Cellular prion protein (PrP) directly binds to Caspr and inhibits Reelin-mediated proteolytic shedding of Caspr from the neuronal cell surface; increased surface Caspr potentiates Caspr-mediated inhibition of neurite outgrowth, while PrP deficiency reduces surface Caspr and enhances neurite outgrowth and axon regeneration in vivo.\",\n      \"method\": \"Co-immunoprecipitation, cell surface Caspr quantification, neurite outgrowth assay, spinal cord injury model in PrP-deficient mice\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP plus functional in vitro and in vivo assays, single lab\",\n      \"pmids\": [\"20610764\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Homozygous frameshift mutations in CNTNAP1 cause a severe form of arthrogryposis multiplex congenita with markedly reduced motor nerve conduction velocity (<10 m/s) and electron microscopy-confirmed severe abnormalities at nodes of Ranvier and myelinated axons in patients, establishing CNTNAP1 as essential for paranodal domain organization and saltatory conduction in humans.\",\n      \"method\": \"Whole exome sequencing, transmission electron microscopy of sciatic nerve biopsy, nerve conduction studies\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human genetics with direct ultrastructural validation in four unrelated families\",\n      \"pmids\": [\"24319099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Caspr and Caspr2 together are required for both radial (mesaxonal internodal line) and longitudinal (nodal domain) organization of the axolemma; double Caspr/Caspr2 null mice show dispersed Kv1 channel aggregates along the axolemma and widened nodes of Ranvier, revealing compensatory roles of the two proteins.\",\n      \"method\": \"Double knockout mouse generation, immunofluorescence, electron microscopy\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — double KO with clear separation of functions and multiple phenotypic readouts\",\n      \"pmids\": [\"25378149\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CNTNAP1 mutations in patients cause characteristic ultrastructural lesions at paranodes: absence of transverse bands, loss of myelin loop-axolemma attachment, and hypomyelination; these lesions are identical to those in Caspr-null mice, confirming the essential role of CNTNAP1 in forming transverse bands that stabilize paranodal axo-glial junctions in humans.\",\n      \"method\": \"Nerve biopsy with electron microscopy in patients with compound heterozygous CNTNAP1 mutations\",\n      \"journal\": \"Journal of neuropathology and experimental neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct ultrastructural phenotyping in human patients with genetically confirmed mutations\",\n      \"pmids\": [\"27818385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Caspr is expressed by radial glial neural progenitor cells in the developing cerebral cortex and regulates the timing of neuron versus astrocyte generation; Caspr-deficient mice show delayed neuronal production and premature astrogenesis. Caspr cooperates with the intracellular domain of Notch to repress Hes1 transcription, and shRNA knockdown of Hes1 rescues the progenitor specification defect.\",\n      \"method\": \"Caspr knockout mouse, in utero electroporation, Hes1 shRNA rescue, BrdU labeling, gene expression analysis\",\n      \"journal\": \"Cerebral cortex\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO phenotype plus mechanistic rescue with shRNA, single lab\",\n      \"pmids\": [\"26740489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CNTNAP1 mutations cause severe CNS hypomyelinating leukodystrophy and peripheral neuropathy with or without arthrogryposis; nerve biopsy shows lack of paranodal transverse bands and widened paranodal junctional gaps, consistent with CNTNAP1's role in paranodal junction formation.\",\n      \"method\": \"Whole-exome sequencing, MRI, nerve biopsy with electron microscopy, neurophysiology in patients from two unrelated families\",\n      \"journal\": \"Neurology. Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human genetic validation with direct ultrastructural evidence across multiple families\",\n      \"pmids\": [\"28374019\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CNTNAP1 (Caspr) is an axonal transmembrane glycoprotein of the neurexin superfamily that forms a cis complex with contactin (requiring F3/contactin for ER exit and lipid raft-mediated plasma membrane delivery), localizes to paranodal septate-like junctions between axons and myelinating glia via trans-interaction with glial NF155, anchors the paranodal adhesion complex to the axon cytoskeleton through its cytoplasmic domain binding to protein 4.1B, regulates contactin glycoprocessing, establishes a membrane diffusion barrier that restricts Kv1 channels to the juxtaparanodal domain, and is required for saltatory conduction; loss-of-function mutations cause severe hypomyelination and paranodal ultrastructural defects in both mice and humans.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CNTNAP1 (Caspr) is a transmembrane glycoprotein of the neurexin superfamily that serves as the central axonal organizer of paranodal septate-like junctions, establishing the membrane diffusion barrier required for saltatory nerve conduction. CNTNAP1 forms a cis complex with contactin (F3), which is required for its exit from the endoplasmic reticulum and delivery to the plasma membrane via a non-conventional, Golgi-independent pathway; CNTNAP1 in turn regulates contactin glycoprocessing and restricts its ability to bind the glial receptor neurofascin-155 (NF155), which mediates trans-axoglial adhesion at paranodes [PMID:10769038, PMID:14676309, PMID:11839274, PMID:12972410]. The cytoplasmic domain of CNTNAP1 binds protein 4.1B through a conserved GNP motif, anchoring the paranodal complex to the actin cytoskeleton; this interaction is specifically required not for paranodal localization itself but for generating the barrier that excludes Kv1 potassium channels from the paranode into the juxtaparanodal domain [PMID:12082082, PMID:20164332]. Loss-of-function mutations in CNTNAP1 cause a severe human disorder featuring arthrogryposis multiplex congenita, hypomyelinating leukodystrophy, and profoundly reduced nerve conduction velocity, with ultrastructural absence of paranodal transverse bands identical to those seen in Caspr-null mice [PMID:24319099, PMID:27818385].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"The identity and localization of the axonal component of paranodal septate-like junctions was unknown; immunoelectron microscopy identified Caspr (CNTNAP1) as a transmembrane glycoprotein concentrated specifically at these junctions and associated with the axon cytoskeleton, establishing the first molecular handle on paranodal organization.\",\n      \"evidence\": \"Immunoelectron microscopy, detergent extraction, and immunofluorescence in myelinating cultures and sciatic nerve tissue\",\n      \"pmids\": [\"9396755\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No functional consequence of Caspr loss was known\", \"Binding partners on the glial side were unidentified\", \"Mechanism of Caspr targeting to paranodes was unknown\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"How Caspr reaches the cell surface and is targeted to paranodes was unclear; reconstitution experiments showed that Caspr is retained in the ER when expressed alone and requires cis association with the GPI-anchored molecule contactin (F3) for plasma membrane delivery via lipid raft microdomains, establishing the obligate heteromeric nature of the complex.\",\n      \"evidence\": \"Transfection in CHO and neuroblastoma cells, surface biotinylation, lipid raft fractionation, co-immunoprecipitation, and myelinating coculture perturbation\",\n      \"pmids\": [\"10769038\", \"11069942\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The glial trans-binding partner was still unidentified\", \"In vivo loss-of-function had not been tested\", \"The trafficking route beyond ER exit was not defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Whether Caspr is essential for nerve function in vivo was untested; Caspr knockout mice showed complete failure of paranodal junction formation, displacement of Kv1 channels into paranodal regions, and severely reduced conduction velocity, proving Caspr is indispensable for axonal domain organization and saltatory conduction.\",\n      \"evidence\": \"Caspr knockout mouse with immunofluorescence, electron microscopy, and electrophysiology\",\n      \"pmids\": [\"11395000\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The mechanism of Kv1 channel exclusion (direct barrier vs. indirect) was not resolved\", \"Cytoplasmic anchoring mechanism was not addressed\", \"Human disease relevance was not yet established\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"The glial receptor completing the trans-paranodal adhesion complex was unknown; binding assays and myelination inhibition experiments identified neurofascin-155 (NF155) as the glial partner that directly interacts with the axonal Caspr–contactin complex, completing the molecular model of the paranodal junction.\",\n      \"evidence\": \"Cell binding assay with transfected cells, pull-down from brain lysates, myelinating coculture inhibition\",\n      \"pmids\": [\"11839274\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the NF155–Caspr/contactin interaction was unknown\", \"Whether NF155 binding is sufficient for junction formation in vivo was not tested\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"How the paranodal complex is stabilized at the membrane was unclear; transgenic rescue and domain-deletion experiments showed that the Caspr cytoplasmic domain binds protein 4.1B via a conserved GNP motif and that this interaction prevents internalization, establishing the cytoskeletal anchor of the paranodal complex.\",\n      \"evidence\": \"Transgenic rescue in Caspr-null mice, co-clustering assays, internalization assays in transfected cells, co-immunoprecipitation from brain\",\n      \"pmids\": [\"12082082\", \"12542678\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether 4.1B binding contributes to the Kv1 channel diffusion barrier was not separated from junction retention\", \"Downstream cytoskeletal linkage to actin was inferred but not directly shown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"The mechanism by which Caspr regulates its partner contactin was unknown; biochemical analysis revealed that Caspr directs expression of a low-molecular-weight, ER-type glycoform of contactin that cannot bind NF155, and that the Caspr–contactin complex traffics to the surface via a brefeldin A-insensitive, Golgi-independent pathway, explaining how Caspr controls both partner processing and the unconventional route to the paranodal membrane.\",\n      \"evidence\": \"Endoglycosidase H sensitivity assays, brefeldin A treatment, calnexin interaction, Caspr knockout mouse glycoform analysis, truncation mutants\",\n      \"pmids\": [\"14676309\", \"12972410\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The identity of the non-conventional trafficking carrier was not determined\", \"How NF155 binding is ultimately restored at the paranode after surface delivery was not explained\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Whether Caspr has additional trans-binding partners beyond NF155 was open; cell binding assays suggested that oligodendroglial Nogo-A interacts directly with Caspr at paranodes and that Caspr also associates with schwannomin/merlin via its cytoplasmic GNP motif, expanding the potential signaling repertoire of Caspr.\",\n      \"evidence\": \"CHO cell binding to Nogo-66 substrates, co-immunoprecipitation, GST pull-down from brain\",\n      \"pmids\": [\"14592966\", \"12558984\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nogo-A–Caspr interaction was shown only in a single lab with overexpression\", \"Functional consequence of schwannomin–Caspr binding at paranodes is undefined\", \"Neither interaction has been validated genetically in vivo\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Whether Caspr functions outside myelinated axons was unknown; analysis of Caspr-null mice revealed that Caspr is required for structural integrity of calyceal synaptic junctions at vestibular hair cells and for clustering of the K+ channel KCNQ4, while the shambling truncating mutation confirmed that the transmembrane and cytoplasmic domains are essential for all paranodal functions.\",\n      \"evidence\": \"Caspr knockout and shambling mutant mice, freeze-fracture EM, immunolabeling, electrophysiology\",\n      \"pmids\": [\"19279247\", \"19816196\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Caspr uses the same molecular partners (contactin, NF155) at vestibular synapses was not determined\", \"Calyceal junction phenotype has not been linked to vestibular behavioral deficits\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Whether the 4.1B-binding function of Caspr is separable from its junction-assembly function was untested; transgenic rescue with a Caspr mutant lacking only the 4.1B-binding site showed that this mutant localizes normally to paranodes and recruits contactin and NF155, but fails to exclude Kv1 channels, demonstrating that 4.1B anchoring specifically generates the paranodal diffusion barrier.\",\n      \"evidence\": \"Transgenic rescue of Caspr-null mice with Caspr-Δ4.1 mutant, immunofluorescence\",\n      \"pmids\": [\"20164332\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The biophysical mechanism by which 4.1B creates the diffusion barrier is unknown\", \"Whether other 4.1 family members partially compensate was not tested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Whether CNTNAP1 loss causes human disease was unresolved; whole-exome sequencing in four unrelated families identified homozygous frameshift CNTNAP1 mutations causing severe arthrogryposis multiplex congenita with profoundly reduced nerve conduction and ultrastructural paranodal defects identical to Caspr-null mice, establishing a direct human disease link.\",\n      \"evidence\": \"Whole-exome sequencing, transmission electron microscopy of nerve biopsy, nerve conduction studies in patients\",\n      \"pmids\": [\"24319099\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genotype–phenotype correlation across different mutation types was limited\", \"Whether any residual Caspr function exists in hypomorphic alleles was unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The relationship between Caspr and Caspr2 in axolemmal organization was unclear; double knockout mice revealed that the two proteins together maintain both radial (internodal) and longitudinal (nodal) organization, with compensatory masking of some defects in single knockouts.\",\n      \"evidence\": \"Caspr/Caspr2 double knockout mouse, immunofluorescence, electron microscopy\",\n      \"pmids\": [\"25378149\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of radial domain organization by Caspr is unknown\", \"Whether Caspr and Caspr2 interact physically was not addressed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"An unexpected developmental role for Caspr was identified: Caspr is expressed in cortical radial glia and cooperates with the Notch intracellular domain to repress Hes1 transcription, thereby regulating the timing of neuron-to-astrocyte fate switching during cortical development.\",\n      \"evidence\": \"Caspr knockout mouse, in utero electroporation, Hes1 shRNA rescue, BrdU labeling\",\n      \"pmids\": [\"26740489\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"This role is from a single lab and has not been independently replicated\", \"How a paranodal adhesion molecule accesses nuclear Notch signaling is mechanistically unexplained\", \"Whether CNTNAP1 patient mutations affect cortical development was not examined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the structural basis of the Caspr–contactin–NF155 ternary complex, the biophysical mechanism by which the Caspr–4.1B interaction creates a membrane diffusion barrier, the identity of the non-conventional trafficking carrier used by the Caspr–contactin complex, and the full genotype–phenotype spectrum of CNTNAP1 mutations in humans.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No atomic-resolution structure of the paranodal complex exists\", \"Mechanism of diffusion barrier formation is entirely unknown at the biophysical level\", \"The non-conventional ER-to-surface pathway has not been molecularly defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 1, 4, 5]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [5, 7, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 2, 3]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [2, 8]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 5, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [3, 11, 12, 15]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [0, 4, 5, 17]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [18]}\n    ],\n    \"complexes\": [\n      \"Caspr–contactin paranodal complex\",\n      \"Caspr–contactin–NF155 axoglial junction complex\"\n    ],\n    \"partners\": [\n      \"CNTN1\",\n      \"NFASC\",\n      \"EPB41L3\",\n      \"NF2\",\n      \"PRNP\",\n      \"RTN4\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}