{"gene":"NRXN3","run_date":"2026-04-29T11:37:57","timeline":{"discoveries":[{"year":2002,"finding":"NRXN3 is expressed not only in neurons but also in heart, lung, pancreas, placenta, liver, and kidney, with heart-specific splicing variants identified; cardiac NRXN3 isoforms were proposed to participate in a complex involving dystroglycan and extracellular matrix proteins involved in intercellular connections.","method":"RT-PCR, tissue expression profiling, characterization of alternative splicing variants","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 — expression and splicing characterization with proposed complex membership, no direct biochemical reconstitution of dystroglycan interaction","pmids":["12379233"],"is_preprint":false},{"year":2008,"finding":"Nrxn3beta mRNA expression is upregulated in the globus pallidus of mice developing cocaine appetence, implicating NRXN3 as a synaptic adhesion molecule involved in synaptic plasticity in basal ganglia indirect pathways underlying reward-related learning.","method":"Quantitative in situ hybridization/mRNA quantification in mouse brain regions after cocaine exposure","journal":"Neuroreport","confidence":"Low","confidence_rationale":"Tier 3 — single mRNA quantification study, no direct functional manipulation of Nrxn3","pmids":["18418251"],"is_preprint":false},{"year":2013,"finding":"FoxQ1 directly binds to the NRXN3 promoter and suppresses its transcriptional activity, thereby downregulating NRXN3 expression; loss of FoxQ1 reduces glioma cell proliferation and migration, indicating NRXN3 acts downstream of FoxQ1 as a tumor suppressor.","method":"ChIP assay, luciferase reporter assay, stable FoxQ1 knockdown/overexpression, MTT proliferation assay, transwell migration assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and luciferase with functional KD/OE readouts in two cell lines, single lab","pmids":["23383267"],"is_preprint":false},{"year":2020,"finding":"ZNF582 directly regulates the transcription of NRXN3 (and Nectin-3) by binding to their promoters; ZNF582 knockdown reduces NRXN3 expression and promotes NPC cell migration/invasion/metastasis, while NRXN3 restoration reverses the pro-metastatic effect of ZNF582 loss.","method":"ChIP-seq, ChIP-qPCR, luciferase assay, qRT-PCR, Western blot, in vitro migration/invasion assays, in vivo metastasis models, rescue experiments","journal":"Cancer communications","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-seq with functional validation and rescue experiments, single lab","pmids":["33038291"],"is_preprint":false},{"year":2021,"finding":"circ_0001367 acts as a sponge for miR-431, which in turn represses NRXN3; the circ_0001367/miR-431/NRXN3 axis suppresses glioma cell proliferation, migration, and invasion in vitro and tumor growth in vivo.","method":"Luciferase reporter assay, RNA immunoprecipitation (RIP), functional overexpression/knockdown assays, rescue experiments, in vivo xenograft","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (RIP, luciferase, rescue) in single lab","pmids":["34035217"],"is_preprint":false},{"year":2023,"finding":"circNrxn3, a circular RNA originating from an intron of Nrxn3, binds the splicing factor SAM68 (by RNA immunoprecipitation) and regulates splicing of Nrxn3 mRNA; circNrxn3 knockdown in the orbitofrontal cortex alters Nrxn3 splicing, upregulates learning/memory pathway genes, and enhances sucrose self-administration and motivation for reward.","method":"RNA immunoprecipitation (RIP), RNA sequencing, qPCR, in vivo lentiviral shRNA knockdown, sucrose self-administration behavioral assay","journal":"Progress in neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 — RIP demonstrating SAM68 binding, RNA-seq splicing analysis, and in vivo behavioral readout; single lab","pmids":["38036039"],"is_preprint":false},{"year":2023,"finding":"Loss-of-function variants in NRXN3 (homozygous missense and compound heterozygous) cause a Mendelian neurodevelopmental disorder with developmental delay, movement disorder, intellectual disability, and behavioral problems, with phenotype resembling homozygous Nrxn3α/β knockout mice.","method":"Whole exome sequencing, CRISPR-edited cell lines for functional validation, in-silico analysis, phenotypic comparison with Nrxn3 knockout mouse model","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 — CRISPR functional validation in patient-derived cells combined with mouse model phenotypic correlation; single study","pmids":["36898513"],"is_preprint":false},{"year":2024,"finding":"C1ql2 interacts directly with a specific splice variant of neurexin-3, Nrxn3(25b+), at mossy fiber-CA3 synapses; this C1ql2-Nrxn3(25b+) interaction is required for synaptic vesicle recruitment and long-term potentiation (LTP). Deletion of Nrxn3 in dentate gyrus granule neurons or expression of a non-binding C1ql2 mutant recapitulates mossy fiber-CA3 synaptic deficits, placing Nrxn3(25b+) downstream of the Bcl11b→C1ql2 transcriptional pathway.","method":"Conditional Nrxn3 knockout in dentate gyrus, non-binding C1ql2 mutant expression, electrophysiological LTP recordings in vivo and in vitro, synaptic vesicle recruitment assay, genetic epistasis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal approaches including conditional KO, dominant-negative mutant, electrophysiology, and epistasis; rigorous mechanistic pathway placement","pmids":["38358390"],"is_preprint":false},{"year":2024,"finding":"Presynaptic Nrxn3 is essential for ribbon-synapse maturation in hair cells; loss of Nrxn3 in mice and zebrafish results in failure of pre- and postsynaptic pairing and a ~60% loss of intact ribbon synapses, dramatically reducing presynaptic calcium responses in hair cells and postsynaptic responses in afferent neurons.","method":"Nrxn3 knockout in mouse and zebrafish, confocal imaging of ribbon synapses, patch-clamp electrophysiology of hair cells and afferent neurons, acoustic startle behavioral assay","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1–2 — loss-of-function in two vertebrate models with direct synaptic and electrophysiological readouts; replicated across species","pmids":["39254120"],"is_preprint":false},{"year":2025,"finding":"NRXN3 competitively blocks caspase-3 binding to the kinase RSK1, thereby preventing RSK1-dependent phosphorylation of caspase-3 at T152; loss of this phosphorylation impairs caspase-3 interaction with the ubiquitin ligase component FBXO1, stabilizes caspase-3, and promotes caspase-3/GSDME-dependent pyroptosis and gemcitabine sensitivity in intrahepatic cholangiocarcinoma.","method":"Genome-scale CRISPR-Cas9 screen, IP-mass spectrometry, co-immunoprecipitation, RNA-seq, in vitro phosphorylation assay, in vivo murine ICC models, RSK1 inhibitor and caspase-3 activator rescue","journal":"Journal of advanced research","confidence":"High","confidence_rationale":"Tier 1 — genome-scale CRISPR screen identifying NRXN3, IP-MS identifying RSK1/FBXO1 as interactors, phosphorylation site mapping, in vivo rescue; multiple orthogonal methods in single rigorous study","pmids":["40324630"],"is_preprint":false},{"year":2025,"finding":"NRXN3 and its ligand NLGN1 (neuroligin-1) form a complex in hippocampus; maternal separation stress downregulates NRXN3 and NLGN1 prior to observed synaptic plasticity changes and depression-related behaviors in rats, placing the NRXN3-NLGN1 complex upstream of hippocampal synaptic plasticity and stress-induced depression susceptibility.","method":"Rat maternal separation model, Western blot/qPCR of NRXN3 and NLGN1, dendritic spine/branch morphology analysis, behavioral depression tests","journal":"Brain research","confidence":"Low","confidence_rationale":"Tier 3 — complex membership inferred from expression correlation and known biology; no direct binding assay for NRXN3-NLGN1 in this study","pmids":["40286836"],"is_preprint":false},{"year":2025,"finding":"Knockdown of Nrxn3 in the central amygdala of rats increases nociceptive orofacial pain responses and elevates c-Fos expression in the central amygdala, lateral parabrachial nucleus, trigeminal ganglia, and trigeminal nucleus caudalis, demonstrating that Nrxn3 in the central amygdala attenuates myofascial nociception by reducing neuronal activity in the orofacial pain pathway.","method":"Stereotaxic Nrxn3 shRNA infusion into central amygdala, tendon ligature pain model, von Frey testing, c-Fos immunostaining","journal":"Neurobiology of pain","confidence":"Medium","confidence_rationale":"Tier 2 — direct in vivo KD with neuroanatomically defined c-Fos readout across the pain circuit; single lab","pmids":["41466820"],"is_preprint":false}],"current_model":"NRXN3 encodes a presynaptic cell-adhesion molecule that organizes synapse assembly and function through isoform-specific interactions (e.g., Nrxn3(25b+) with C1ql2 at mossy fiber-CA3 synapses, and with NLGN1), is required for ribbon-synapse maturation in sensory hair cells, modulates nociceptive signaling via the central amygdala, regulates splicing of its own mRNA through a circRNA-SAM68 axis, and in non-neuronal contexts competitively inhibits RSK1-dependent phosphorylation of caspase-3 to control pyroptosis and chemosensitivity; its transcription is directly regulated by FoxQ1 and ZNF582, and loss-of-function variants cause autosomal recessive neurodevelopmental disorders."},"narrative":{"teleology":[{"year":2002,"claim":"Establishing that NRXN3 expression extends beyond the nervous system addressed whether this neurexin functions exclusively at neuronal synapses, revealing broad tissue expression with heart-specific splice variants.","evidence":"RT-PCR and splicing analysis across human tissues","pmids":["12379233"],"confidence":"Low","gaps":["No direct biochemical reconstitution of proposed dystroglycan interaction","Functional significance of cardiac isoforms not tested","No loss-of-function data in non-neuronal tissues"]},{"year":2013,"claim":"Identifying FoxQ1 as a direct transcriptional repressor of NRXN3 established the first upstream regulatory mechanism and linked NRXN3 to growth suppression in glioma, raising the question of whether NRXN3 acts as a tumor suppressor in brain tumors.","evidence":"ChIP and luciferase reporter in glioma cell lines with FoxQ1 knockdown/overexpression","pmids":["23383267"],"confidence":"Medium","gaps":["Mechanism by which NRXN3 suppresses glioma proliferation and migration not defined","Single-lab finding in glioma cell lines","No in vivo tumor model"]},{"year":2020,"claim":"Demonstrating that ZNF582 directly activates NRXN3 transcription and that NRXN3 restoration rescues ZNF582-loss-driven metastasis defined a second transcriptional regulator and reinforced an anti-metastatic role for NRXN3 in cancer.","evidence":"ChIP-seq, luciferase, rescue experiments, and in vivo metastasis models in nasopharyngeal carcinoma","pmids":["33038291"],"confidence":"Medium","gaps":["Whether NRXN3 exerts anti-metastatic effects through synaptic adhesion-like mechanisms or a distinct pathway is unknown","Downstream signaling from NRXN3 in epithelial cells undefined"]},{"year":2023,"claim":"Discovery that biallelic NRXN3 loss-of-function variants cause a Mendelian neurodevelopmental disorder established direct human disease causality and linked the phenotype to Nrxn3 knockout mouse models.","evidence":"Whole-exome sequencing with CRISPR-edited cell functional validation and mouse phenotype comparison","pmids":["36898513"],"confidence":"Medium","gaps":["Only a small number of families reported","Relative contributions of α- and β-neurexin-3 isoforms to the human phenotype not resolved","Synaptic pathophysiology in patient neurons not characterized"]},{"year":2023,"claim":"Identification of circNrxn3 as a circular RNA that binds SAM68 and regulates Nrxn3 mRNA splicing revealed a cis-acting autoregulatory feedback loop and linked isoform control to reward-related behavior.","evidence":"RNA immunoprecipitation, RNA-seq after lentiviral shRNA knockdown in rat orbitofrontal cortex, sucrose self-administration assay","pmids":["38036039"],"confidence":"Medium","gaps":["Whether SAM68 is the sole effector of circNrxn3-mediated splicing regulation is untested","Which specific Nrxn3 exons are critically controlled by this axis remains partially defined","Replication in independent cohorts or species needed"]},{"year":2024,"claim":"Conditional Nrxn3 deletion in dentate gyrus granule neurons and complementary non-binding C1ql2 mutant experiments resolved an isoform-specific trans-synaptic code: Nrxn3(25b+)–C1ql2 interaction is required for synaptic vesicle recruitment and LTP at mossy fiber–CA3 synapses.","evidence":"Conditional knockout, dominant-negative C1ql2 mutant, in vivo and in vitro electrophysiology, genetic epistasis in mouse","pmids":["38358390"],"confidence":"High","gaps":["Structural basis of the Nrxn3(25b+)–C1ql2 interface not determined","Whether other Nrxn3 splice variants function at distinct synapse types is unknown"]},{"year":2024,"claim":"Demonstrating that Nrxn3 is essential for ribbon-synapse maturation in both mouse and zebrafish hair cells extended the gene's synaptic organizer role to a non-conventional synapse type and established cross-species conservation.","evidence":"Nrxn3 knockout in mouse and zebrafish with confocal imaging, patch-clamp electrophysiology of hair cells and afferent neurons, acoustic startle assay","pmids":["39254120"],"confidence":"High","gaps":["Postsynaptic binding partner at hair cell ribbon synapses not identified","Mechanism by which Nrxn3 coordinates pre- and postsynaptic assembly at ribbons not defined"]},{"year":2025,"claim":"A genome-scale CRISPR screen uncovered a non-synaptic mechanism: NRXN3 competitively inhibits RSK1-mediated phosphorylation of caspase-3 at T152, preventing FBXO1-dependent caspase-3 degradation and thereby promoting pyroptosis and chemosensitivity in cholangiocarcinoma.","evidence":"CRISPR screen, IP-mass spectrometry, co-immunoprecipitation, in vitro phosphorylation assay, in vivo murine ICC models with RSK1 inhibitor rescue","pmids":["40324630"],"confidence":"High","gaps":["Whether this RSK1-caspase-3 competition operates in other cancer types or normal tissues is unknown","Structural determinants of NRXN3–RSK1 binding not mapped","Relationship between synaptic and non-synaptic NRXN3 isoforms in this context unclear"]},{"year":2025,"claim":"Knockdown of Nrxn3 specifically in the central amygdala increased nociceptive responses and neuronal activation across the orofacial pain circuit, establishing a functional role for Nrxn3 in pain modulation at a defined brain locus.","evidence":"Stereotaxic shRNA infusion in rat central amygdala, tendon ligature model, von Frey testing, c-Fos immunostaining","pmids":["41466820"],"confidence":"Medium","gaps":["Whether Nrxn3's anti-nociceptive effect operates through specific trans-synaptic partners in the amygdala is unknown","Single pain model and sensory modality tested"]},{"year":null,"claim":"Key unresolved questions include the structural basis of isoform-specific ligand recognition (e.g., Nrxn3(25b+)–C1ql2), identification of the postsynaptic binding partner at ribbon synapses, and whether the non-synaptic RSK1-competitive mechanism is broadly relevant in normal physiology or restricted to cancer contexts.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of any Nrxn3 complex","Postsynaptic partner at ribbon synapses unidentified","Integration of synaptic and non-synaptic NRXN3 functions into a unified model lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[7,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[9]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[7,8]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[7,8,11]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[9]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[7,8]}],"complexes":[],"partners":["C1QL2","RSK1","CASP3","SAM68","NLGN1"],"other_free_text":[]},"mechanistic_narrative":"NRXN3 encodes a presynaptic cell-adhesion molecule that organizes synapse assembly, maturation, and plasticity through isoform-specific trans-synaptic interactions. The splice variant Nrxn3(25b+) binds C1ql2 at mossy fiber–CA3 synapses to recruit synaptic vesicles and enable long-term potentiation downstream of the Bcl11b→C1ql2 transcriptional pathway [PMID:38358390], while Nrxn3 is independently required for ribbon-synapse maturation in sensory hair cells across vertebrate species [PMID:39254120]. In a non-neuronal context, NRXN3 competitively blocks RSK1-dependent phosphorylation of caspase-3 at T152, thereby stabilizing caspase-3 and promoting GSDME-dependent pyroptosis and gemcitabine chemosensitivity in intrahepatic cholangiocarcinoma [PMID:40324630]. Biallelic loss-of-function variants in NRXN3 cause an autosomal recessive neurodevelopmental disorder featuring developmental delay, movement abnormalities, and intellectual disability [PMID:36898513]."},"prefetch_data":{"uniprot":{"accession":"Q9HDB5","full_name":"Neurexin-3-beta","aliases":["Neurexin III-beta"],"length_aa":637,"mass_kda":69.3,"function":"Neuronal cell surface protein that may be involved in cell recognition and cell adhesion. May mediate intracellular signaling (By similarity). Functions as part of a trans-synaptic complex by binding to cerebellins and postsynaptic GRID1. This interaction helps regulate the activity of NMDA and AMPA receptors at hippocampal synapses without affecting synapse formation. NRXN3B-CBLN2-GRID1 complex transduce presynaptic signals into postsynaptic AMPAR response (By similarity)","subcellular_location":"Presynaptic cell membrane","url":"https://www.uniprot.org/uniprotkb/Q9HDB5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NRXN3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NRXN3","total_profiled":1310},"omim":[{"mim_id":"621407","title":"SCHIZOPHRENIA 17; SCZD17","url":"https://www.omim.org/entry/621407"},{"mim_id":"615029","title":"PRECEREBELLIN 4; CBLN4","url":"https://www.omim.org/entry/615029"},{"mim_id":"610421","title":"KH DOMAIN-CONTAINING, RNA-BINDING, SIGNAL TRANSDUCTION-ASSOCIATED PROTEIN 3; KHDRBS3","url":"https://www.omim.org/entry/610421"},{"mim_id":"600567","title":"NEUREXIN III; NRXN3","url":"https://www.omim.org/entry/600567"},{"mim_id":"600566","title":"NEUREXIN II; NRXN2","url":"https://www.omim.org/entry/600566"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":123.6},{"tissue":"retina","ntpm":39.8}],"url":"https://www.proteinatlas.org/search/NRXN3"},"hgnc":{"alias_symbol":["KIAA0743"],"prev_symbol":["C14orf60"]},"alphafold":{"accession":"Q9HDB5","domains":[{"cath_id":"2.60.120.200","chopping":"85-255","consensus_level":"high","plddt":96.6571,"start":85,"end":255}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HDB5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HDB5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HDB5-F1-predicted_aligned_error_v6.png","plddt_mean":59.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NRXN3","jax_strain_url":"https://www.jax.org/strain/search?query=NRXN3"},"sequence":{"accession":"Q9HDB5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9HDB5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9HDB5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HDB5"}},"corpus_meta":[{"pmid":"19557197","id":"PMC_19557197","title":"NRXN3 is a novel locus for waist circumference: a genome-wide association study from the CHARGE Consortium.","date":"2009","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19557197","citation_count":205,"is_preprint":false},{"pmid":"23383267","id":"PMC_23383267","title":"FoxQ1 promotes glioma cells proliferation and migration by regulating NRXN3 expression.","date":"2013","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/23383267","citation_count":47,"is_preprint":false},{"pmid":"29995770","id":"PMC_29995770","title":"Low expression of aging-related NRXN3 is associated with Alzheimer disease: A systematic review and meta-analysis.","date":"2018","source":"Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/29995770","citation_count":38,"is_preprint":false},{"pmid":"19658047","id":"PMC_19658047","title":"Association of a polymorphism in the NRXN3 gene with the degree of smoking in schizophrenia: a preliminary study.","date":"2009","source":"The world journal of biological 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Portuguese children.","date":"2014","source":"Journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/24670271","citation_count":34,"is_preprint":false},{"pmid":"34035217","id":"PMC_34035217","title":"Circ_0001367 inhibits glioma proliferation, migration and invasion by sponging miR-431 and thus regulating NRXN3.","date":"2021","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/34035217","citation_count":33,"is_preprint":false},{"pmid":"20703240","id":"PMC_20703240","title":"Polymorphisms in NRXN3, TFAP2B, MSRA, LYPLAL1, FTO and MC4R and their effect on visceral fat area in the Japanese population.","date":"2010","source":"Journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/20703240","citation_count":32,"is_preprint":false},{"pmid":"23306218","id":"PMC_23306218","title":"Association study of NRXN3 polymorphisms with schizophrenia and risperidone-induced bodyweight gain in Chinese Han population.","date":"2013","source":"Progress in 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cardiac NRXN3 isoforms were proposed to participate in a complex involving dystroglycan and extracellular matrix proteins involved in intercellular connections.\",\n      \"method\": \"RT-PCR, tissue expression profiling, characterization of alternative splicing variants\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — expression and splicing characterization with proposed complex membership, no direct biochemical reconstitution of dystroglycan interaction\",\n      \"pmids\": [\"12379233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Nrxn3beta mRNA expression is upregulated in the globus pallidus of mice developing cocaine appetence, implicating NRXN3 as a synaptic adhesion molecule involved in synaptic plasticity in basal ganglia indirect pathways underlying reward-related learning.\",\n      \"method\": \"Quantitative in situ hybridization/mRNA quantification in mouse brain regions after cocaine exposure\",\n      \"journal\": \"Neuroreport\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single mRNA quantification study, no direct functional manipulation of Nrxn3\",\n      \"pmids\": [\"18418251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"FoxQ1 directly binds to the NRXN3 promoter and suppresses its transcriptional activity, thereby downregulating NRXN3 expression; loss of FoxQ1 reduces glioma cell proliferation and migration, indicating NRXN3 acts downstream of FoxQ1 as a tumor suppressor.\",\n      \"method\": \"ChIP assay, luciferase reporter assay, stable FoxQ1 knockdown/overexpression, MTT proliferation assay, transwell migration assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and luciferase with functional KD/OE readouts in two cell lines, single lab\",\n      \"pmids\": [\"23383267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ZNF582 directly regulates the transcription of NRXN3 (and Nectin-3) by binding to their promoters; ZNF582 knockdown reduces NRXN3 expression and promotes NPC cell migration/invasion/metastasis, while NRXN3 restoration reverses the pro-metastatic effect of ZNF582 loss.\",\n      \"method\": \"ChIP-seq, ChIP-qPCR, luciferase assay, qRT-PCR, Western blot, in vitro migration/invasion assays, in vivo metastasis models, rescue experiments\",\n      \"journal\": \"Cancer communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq with functional validation and rescue experiments, single lab\",\n      \"pmids\": [\"33038291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"circ_0001367 acts as a sponge for miR-431, which in turn represses NRXN3; the circ_0001367/miR-431/NRXN3 axis suppresses glioma cell proliferation, migration, and invasion in vitro and tumor growth in vivo.\",\n      \"method\": \"Luciferase reporter assay, RNA immunoprecipitation (RIP), functional overexpression/knockdown assays, rescue experiments, in vivo xenograft\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (RIP, luciferase, rescue) in single lab\",\n      \"pmids\": [\"34035217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"circNrxn3, a circular RNA originating from an intron of Nrxn3, binds the splicing factor SAM68 (by RNA immunoprecipitation) and regulates splicing of Nrxn3 mRNA; circNrxn3 knockdown in the orbitofrontal cortex alters Nrxn3 splicing, upregulates learning/memory pathway genes, and enhances sucrose self-administration and motivation for reward.\",\n      \"method\": \"RNA immunoprecipitation (RIP), RNA sequencing, qPCR, in vivo lentiviral shRNA knockdown, sucrose self-administration behavioral assay\",\n      \"journal\": \"Progress in neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RIP demonstrating SAM68 binding, RNA-seq splicing analysis, and in vivo behavioral readout; single lab\",\n      \"pmids\": [\"38036039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Loss-of-function variants in NRXN3 (homozygous missense and compound heterozygous) cause a Mendelian neurodevelopmental disorder with developmental delay, movement disorder, intellectual disability, and behavioral problems, with phenotype resembling homozygous Nrxn3α/β knockout mice.\",\n      \"method\": \"Whole exome sequencing, CRISPR-edited cell lines for functional validation, in-silico analysis, phenotypic comparison with Nrxn3 knockout mouse model\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR functional validation in patient-derived cells combined with mouse model phenotypic correlation; single study\",\n      \"pmids\": [\"36898513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"C1ql2 interacts directly with a specific splice variant of neurexin-3, Nrxn3(25b+), at mossy fiber-CA3 synapses; this C1ql2-Nrxn3(25b+) interaction is required for synaptic vesicle recruitment and long-term potentiation (LTP). Deletion of Nrxn3 in dentate gyrus granule neurons or expression of a non-binding C1ql2 mutant recapitulates mossy fiber-CA3 synaptic deficits, placing Nrxn3(25b+) downstream of the Bcl11b→C1ql2 transcriptional pathway.\",\n      \"method\": \"Conditional Nrxn3 knockout in dentate gyrus, non-binding C1ql2 mutant expression, electrophysiological LTP recordings in vivo and in vitro, synaptic vesicle recruitment assay, genetic epistasis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal approaches including conditional KO, dominant-negative mutant, electrophysiology, and epistasis; rigorous mechanistic pathway placement\",\n      \"pmids\": [\"38358390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Presynaptic Nrxn3 is essential for ribbon-synapse maturation in hair cells; loss of Nrxn3 in mice and zebrafish results in failure of pre- and postsynaptic pairing and a ~60% loss of intact ribbon synapses, dramatically reducing presynaptic calcium responses in hair cells and postsynaptic responses in afferent neurons.\",\n      \"method\": \"Nrxn3 knockout in mouse and zebrafish, confocal imaging of ribbon synapses, patch-clamp electrophysiology of hair cells and afferent neurons, acoustic startle behavioral assay\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — loss-of-function in two vertebrate models with direct synaptic and electrophysiological readouts; replicated across species\",\n      \"pmids\": [\"39254120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NRXN3 competitively blocks caspase-3 binding to the kinase RSK1, thereby preventing RSK1-dependent phosphorylation of caspase-3 at T152; loss of this phosphorylation impairs caspase-3 interaction with the ubiquitin ligase component FBXO1, stabilizes caspase-3, and promotes caspase-3/GSDME-dependent pyroptosis and gemcitabine sensitivity in intrahepatic cholangiocarcinoma.\",\n      \"method\": \"Genome-scale CRISPR-Cas9 screen, IP-mass spectrometry, co-immunoprecipitation, RNA-seq, in vitro phosphorylation assay, in vivo murine ICC models, RSK1 inhibitor and caspase-3 activator rescue\",\n      \"journal\": \"Journal of advanced research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — genome-scale CRISPR screen identifying NRXN3, IP-MS identifying RSK1/FBXO1 as interactors, phosphorylation site mapping, in vivo rescue; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"40324630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NRXN3 and its ligand NLGN1 (neuroligin-1) form a complex in hippocampus; maternal separation stress downregulates NRXN3 and NLGN1 prior to observed synaptic plasticity changes and depression-related behaviors in rats, placing the NRXN3-NLGN1 complex upstream of hippocampal synaptic plasticity and stress-induced depression susceptibility.\",\n      \"method\": \"Rat maternal separation model, Western blot/qPCR of NRXN3 and NLGN1, dendritic spine/branch morphology analysis, behavioral depression tests\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — complex membership inferred from expression correlation and known biology; no direct binding assay for NRXN3-NLGN1 in this study\",\n      \"pmids\": [\"40286836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Knockdown of Nrxn3 in the central amygdala of rats increases nociceptive orofacial pain responses and elevates c-Fos expression in the central amygdala, lateral parabrachial nucleus, trigeminal ganglia, and trigeminal nucleus caudalis, demonstrating that Nrxn3 in the central amygdala attenuates myofascial nociception by reducing neuronal activity in the orofacial pain pathway.\",\n      \"method\": \"Stereotaxic Nrxn3 shRNA infusion into central amygdala, tendon ligature pain model, von Frey testing, c-Fos immunostaining\",\n      \"journal\": \"Neurobiology of pain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct in vivo KD with neuroanatomically defined c-Fos readout across the pain circuit; single lab\",\n      \"pmids\": [\"41466820\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NRXN3 encodes a presynaptic cell-adhesion molecule that organizes synapse assembly and function through isoform-specific interactions (e.g., Nrxn3(25b+) with C1ql2 at mossy fiber-CA3 synapses, and with NLGN1), is required for ribbon-synapse maturation in sensory hair cells, modulates nociceptive signaling via the central amygdala, regulates splicing of its own mRNA through a circRNA-SAM68 axis, and in non-neuronal contexts competitively inhibits RSK1-dependent phosphorylation of caspase-3 to control pyroptosis and chemosensitivity; its transcription is directly regulated by FoxQ1 and ZNF582, and loss-of-function variants cause autosomal recessive neurodevelopmental disorders.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NRXN3 encodes a presynaptic cell-adhesion molecule that organizes synapse assembly, maturation, and plasticity through isoform-specific trans-synaptic interactions. The splice variant Nrxn3(25b+) binds C1ql2 at mossy fiber–CA3 synapses to recruit synaptic vesicles and enable long-term potentiation downstream of the Bcl11b→C1ql2 transcriptional pathway [PMID:38358390], while Nrxn3 is independently required for ribbon-synapse maturation in sensory hair cells across vertebrate species [PMID:39254120]. In a non-neuronal context, NRXN3 competitively blocks RSK1-dependent phosphorylation of caspase-3 at T152, thereby stabilizing caspase-3 and promoting GSDME-dependent pyroptosis and gemcitabine chemosensitivity in intrahepatic cholangiocarcinoma [PMID:40324630]. Biallelic loss-of-function variants in NRXN3 cause an autosomal recessive neurodevelopmental disorder featuring developmental delay, movement abnormalities, and intellectual disability [PMID:36898513].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Establishing that NRXN3 expression extends beyond the nervous system addressed whether this neurexin functions exclusively at neuronal synapses, revealing broad tissue expression with heart-specific splice variants.\",\n      \"evidence\": \"RT-PCR and splicing analysis across human tissues\",\n      \"pmids\": [\"12379233\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct biochemical reconstitution of proposed dystroglycan interaction\", \"Functional significance of cardiac isoforms not tested\", \"No loss-of-function data in non-neuronal tissues\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identifying FoxQ1 as a direct transcriptional repressor of NRXN3 established the first upstream regulatory mechanism and linked NRXN3 to growth suppression in glioma, raising the question of whether NRXN3 acts as a tumor suppressor in brain tumors.\",\n      \"evidence\": \"ChIP and luciferase reporter in glioma cell lines with FoxQ1 knockdown/overexpression\",\n      \"pmids\": [\"23383267\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which NRXN3 suppresses glioma proliferation and migration not defined\", \"Single-lab finding in glioma cell lines\", \"No in vivo tumor model\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrating that ZNF582 directly activates NRXN3 transcription and that NRXN3 restoration rescues ZNF582-loss-driven metastasis defined a second transcriptional regulator and reinforced an anti-metastatic role for NRXN3 in cancer.\",\n      \"evidence\": \"ChIP-seq, luciferase, rescue experiments, and in vivo metastasis models in nasopharyngeal carcinoma\",\n      \"pmids\": [\"33038291\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether NRXN3 exerts anti-metastatic effects through synaptic adhesion-like mechanisms or a distinct pathway is unknown\", \"Downstream signaling from NRXN3 in epithelial cells undefined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Discovery that biallelic NRXN3 loss-of-function variants cause a Mendelian neurodevelopmental disorder established direct human disease causality and linked the phenotype to Nrxn3 knockout mouse models.\",\n      \"evidence\": \"Whole-exome sequencing with CRISPR-edited cell functional validation and mouse phenotype comparison\",\n      \"pmids\": [\"36898513\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Only a small number of families reported\", \"Relative contributions of α- and β-neurexin-3 isoforms to the human phenotype not resolved\", \"Synaptic pathophysiology in patient neurons not characterized\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identification of circNrxn3 as a circular RNA that binds SAM68 and regulates Nrxn3 mRNA splicing revealed a cis-acting autoregulatory feedback loop and linked isoform control to reward-related behavior.\",\n      \"evidence\": \"RNA immunoprecipitation, RNA-seq after lentiviral shRNA knockdown in rat orbitofrontal cortex, sucrose self-administration assay\",\n      \"pmids\": [\"38036039\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether SAM68 is the sole effector of circNrxn3-mediated splicing regulation is untested\", \"Which specific Nrxn3 exons are critically controlled by this axis remains partially defined\", \"Replication in independent cohorts or species needed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Conditional Nrxn3 deletion in dentate gyrus granule neurons and complementary non-binding C1ql2 mutant experiments resolved an isoform-specific trans-synaptic code: Nrxn3(25b+)–C1ql2 interaction is required for synaptic vesicle recruitment and LTP at mossy fiber–CA3 synapses.\",\n      \"evidence\": \"Conditional knockout, dominant-negative C1ql2 mutant, in vivo and in vitro electrophysiology, genetic epistasis in mouse\",\n      \"pmids\": [\"38358390\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the Nrxn3(25b+)–C1ql2 interface not determined\", \"Whether other Nrxn3 splice variants function at distinct synapse types is unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrating that Nrxn3 is essential for ribbon-synapse maturation in both mouse and zebrafish hair cells extended the gene's synaptic organizer role to a non-conventional synapse type and established cross-species conservation.\",\n      \"evidence\": \"Nrxn3 knockout in mouse and zebrafish with confocal imaging, patch-clamp electrophysiology of hair cells and afferent neurons, acoustic startle assay\",\n      \"pmids\": [\"39254120\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Postsynaptic binding partner at hair cell ribbon synapses not identified\", \"Mechanism by which Nrxn3 coordinates pre- and postsynaptic assembly at ribbons not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A genome-scale CRISPR screen uncovered a non-synaptic mechanism: NRXN3 competitively inhibits RSK1-mediated phosphorylation of caspase-3 at T152, preventing FBXO1-dependent caspase-3 degradation and thereby promoting pyroptosis and chemosensitivity in cholangiocarcinoma.\",\n      \"evidence\": \"CRISPR screen, IP-mass spectrometry, co-immunoprecipitation, in vitro phosphorylation assay, in vivo murine ICC models with RSK1 inhibitor rescue\",\n      \"pmids\": [\"40324630\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this RSK1-caspase-3 competition operates in other cancer types or normal tissues is unknown\", \"Structural determinants of NRXN3–RSK1 binding not mapped\", \"Relationship between synaptic and non-synaptic NRXN3 isoforms in this context unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Knockdown of Nrxn3 specifically in the central amygdala increased nociceptive responses and neuronal activation across the orofacial pain circuit, establishing a functional role for Nrxn3 in pain modulation at a defined brain locus.\",\n      \"evidence\": \"Stereotaxic shRNA infusion in rat central amygdala, tendon ligature model, von Frey testing, c-Fos immunostaining\",\n      \"pmids\": [\"41466820\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether Nrxn3's anti-nociceptive effect operates through specific trans-synaptic partners in the amygdala is unknown\", \"Single pain model and sensory modality tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of isoform-specific ligand recognition (e.g., Nrxn3(25b+)–C1ql2), identification of the postsynaptic binding partner at ribbon synapses, and whether the non-synaptic RSK1-competitive mechanism is broadly relevant in normal physiology or restricted to cancer contexts.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of any Nrxn3 complex\", \"Postsynaptic partner at ribbon synapses unidentified\", \"Integration of synaptic and non-synaptic NRXN3 functions into a unified model lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [7, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [7, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [7, 8, 11]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [7, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"C1QL2\",\n      \"RSK1\",\n      \"CASP3\",\n      \"SAM68\",\n      \"NLGN1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}