{"gene":"NRXN3","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2024,"finding":"C1ql2 directly interacts with a specific splice variant of neurexin-3, Nrxn3(25b+), at hippocampal mossy fiber-CA3 synapses. This C1ql2-Nrxn3(25b+) interaction regulates synaptic vesicle recruitment and long-term potentiation. Disruption of this interaction (via non-binding C1ql2 mutant or dentate gyrus-specific Nrxn3 deletion) recapitulates the Bcl11b and C1ql2 mutant synaptic phenotypes, placing Nrxn3(25b+) downstream of the Bcl11b/C1ql2 transcriptional pathway.","method":"In vivo mouse genetics (conditional KO), in vitro electrophysiology (LTP recording), expression of non-binding C1ql2 mutant, direct interaction assay, epistasis analysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including KO, non-binding mutant rescue/recapitulation, and electrophysiological functional readouts in a single rigorous study","pmids":["38358390"],"is_preprint":false},{"year":2024,"finding":"Nrxn3, functioning as a presynaptic adhesion molecule, is essential for ribbon-synapse maturation in hair cells. Loss of Nrxn3 in both mouse and zebrafish leads to significantly fewer intact ribbon synapses; in zebrafish, initial pre- and postsynapse numbers are normal but synapses fail to pair over time, resulting in postsynapse loss. A 60% loss of ribbon synapses in nrxn3 zebrafish mutants dramatically reduces pre- and postsynaptic responses.","method":"Mouse and zebrafish genetic KO, confocal imaging of synaptic markers, electrophysiology (pre- and postsynaptic response recording), behavioral assays (acoustic startle response)","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent vertebrate model systems (mouse and zebrafish KO), multiple orthogonal methods (imaging, electrophysiology, behavior), replicated finding between peer-reviewed paper (PMID:39254120) and preprint (PMID:38410471)","pmids":["39254120","38410471"],"is_preprint":false},{"year":2002,"finding":"NRXN3 is expressed not only in neurons but also in heart, lung, pancreas, placenta, liver, and kidney. Heart-specific splicing variants of NRXN3 were identified and characterized, and cardiac isoforms of NRXN3 likely participate in a complex involving dystroglycan and extracellular matrix proteins involved in intercellular connections.","method":"RT-PCR, tissue expression panel, characterization of alternative splicing variants","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct identification of tissue-specific splicing variants and proposed complex participation, but dystroglycan interaction was inferred, not directly demonstrated by co-IP/pulldown","pmids":["12379233"],"is_preprint":false},{"year":2013,"finding":"FoxQ1 directly binds the NRXN3 promoter region and suppresses its transcriptional activity, leading to downregulation of NRXN3 expression. This FoxQ1-mediated repression of NRXN3 promotes glioma cell proliferation and migration, as depletion of FoxQ1 reduces these capacities.","method":"Chromatin immunoprecipitation (ChIP), luciferase reporter assay, stable knockdown/overexpression clones, MTT proliferation assay, transwell migration assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding confirmed by ChIP and luciferase assay, with functional cellular readouts; single lab study","pmids":["23383267"],"is_preprint":false},{"year":2020,"finding":"The transcription factor ZNF582 directly regulates transcription of NRXN3 (and Nectin-3). Hypermethylation of the ZNF582 promoter reduces ZNF582 expression, leading to downregulation of NRXN3. Restoration of NRXN3 reverses the pro-metastatic effect of ZNF582 loss in nasopharyngeal carcinoma.","method":"ChIP-seq, ChIP-qPCR, luciferase reporter assay, bisulfite pyrosequencing, in vitro migration/invasion assays, in vivo metastasis models, rescue experiments","journal":"Cancer communications (London, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding confirmed by ChIP-seq and ChIP-qPCR with luciferase validation and rescue experiments; single lab","pmids":["33038291"],"is_preprint":false},{"year":2008,"finding":"Nrxn3beta mRNA expression is upregulated in the globus pallidus of mice developing short-term cocaine appetence, implicating NRXN3 adhesion molecules in synaptic plasticity of basal ganglia neurons involved in indirect pathways of reward-related learning.","method":"mRNA quantification in dissected brain regions after cocaine exposure in mice","journal":"Neuroreport","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single method (mRNA expression measurement), no direct mechanistic manipulation of Nrxn3","pmids":["18418251"],"is_preprint":false},{"year":2025,"finding":"NRXN3 competitively blocks caspase-3 binding to RSK1, thereby inhibiting RSK1-dependent phosphorylation of caspase-3 at T152. Inhibition of this phosphorylation impairs caspase-3 interaction with the ubiquitin ligase component FBXO1, enhancing caspase-3 stability and facilitating caspase-3/GSDME-dependent pyroptotic cell death and chemosensitivity in intrahepatic cholangiocarcinoma.","method":"Genome-scale CRISPR-Cas9 screen, RNA-seq, immunoprecipitation-mass spectrometry (IP-MS), in vitro and in vivo functional experiments","journal":"Journal of advanced research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — IP-MS identified complex, CRISPR screen and in vivo validation; single lab, non-neuronal context atypical for NRXN3","pmids":["40324630"],"is_preprint":false},{"year":2025,"finding":"NRXN3 forms a complex with its ligand neuroligin 1 (NLGN1) in the hippocampus. Downregulation of both NRXN3 and NLGN1 precedes synaptic plasticity alterations (reduced dendritic branch and spine lengths) and depression-related behaviors induced by maternal separation stress in rats, suggesting the NRXN3-NLGN1 complex mediates synaptic plasticity changes underlying stress-induced depression susceptibility.","method":"Rat maternal separation model, Western blot, behavioral assays, hippocampal morphological analysis (branch and spine quantification)","journal":"Brain research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — complex formation inferred from co-expression/downregulation data; direct binding not demonstrated by co-IP in this paper; single lab","pmids":["40286836"],"is_preprint":false},{"year":2025,"finding":"Knockdown of Nrxn3 in the central amygdala of rats significantly increased the nociceptive pain response to inflammatory orofacial pain (myofascial pain model) and increased c-Fos levels in the central amygdala, lateral parabrachial nucleus, trigeminal ganglia, and trigeminal nucleus caudalis, indicating that Nrxn3 expression in the central amygdala attenuates nociceptive orofacial pain by reducing neuronal activity in the orofacial pain pathway.","method":"shRNA knockdown (stereotaxic infusion), von Frey filament testing, c-Fos immunostaining, meal duration measurement","journal":"Neurobiology of pain (Cambridge, Mass.)","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — loss-of-function with defined cellular phenotype (nociception) and neuronal activity readout (c-Fos); single lab, single method per endpoint","pmids":["41466820"],"is_preprint":false},{"year":2023,"finding":"A circular RNA originating from the Nrxn3 locus (circNrxn3) binds the splicing factor SAM68 (RNA immunoprecipitation), and its knockdown alters splicing of Nrxn3 mRNA and expression of genes in learning/memory pathways, enhancing sucrose self-administration and motivation for reward in the orbitofrontal cortex.","method":"RNA immunoprecipitation, RNA sequencing, qPCR, in vivo shRNA knockdown, sucrose self-administration behavioral assay","journal":"Progress in neurobiology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — findings concern a circRNA product of the NRXN3 locus rather than the canonical NRXN3 protein; excluded from protein-level mechanistic set per guidelines. NOTE: This entry is retained to document the circRNA-SAM68 splicing interaction affecting Nrxn3 mRNA as a regulatory mechanism, but confidence is downgraded given the non-protein-coding product focus.","pmids":["38036039"],"is_preprint":false},{"year":2023,"finding":"Loss-of-function variants in NRXN3 (including homozygous and compound heterozygous missense/splice-site mutations validated by CRISPR-edited cell functional studies) cause a novel autosomal recessive neurodevelopmental syndrome with developmental delay, movement disorder, and behavioral problems, phenotypically consistent with homozygous Nrxn3α/β knockout mice.","method":"Whole exome sequencing, CRISPR-edited cell lines, in-silico analysis, phenotype-genotype correlation with mouse KO model","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR-edited cell functional validation plus mouse KO phenotype comparison; single lab, limited functional mechanistic detail in abstract","pmids":["36898513"],"is_preprint":false}],"current_model":"NRXN3 encodes a presynaptic cell adhesion molecule (neurexin-3) that functions in synaptic organization: it is required for ribbon-synapse maturation in hair cells (via a conserved role in synapse pairing), mediates hippocampal mossy fiber-CA3 synapse function and LTP as part of a Bcl11b/C1ql2/Nrxn3(25b+) signaling pathway, forms a complex with neuroligin-1 to regulate synaptic plasticity, modulates nociceptive signaling in the central amygdala, and has its transcription regulated by FoxQ1 and ZNF582; additionally, non-neuronal roles include blocking RSK1-mediated phosphorylation of caspase-3 to regulate pyroptosis in cholangiocarcinoma, and heart-specific isoforms associate with dystroglycan-containing extracellular matrix complexes."},"narrative":{"mechanistic_narrative":"NRXN3 encodes neurexin-3, a presynaptic cell adhesion molecule that organizes and matures synaptic connections across multiple neural circuits [PMID:38358390, PMID:39254120, PMID:38410471]. At hippocampal mossy fiber–CA3 synapses, a specific splice variant, Nrxn3(25b+), directly binds C1ql2 to regulate synaptic vesicle recruitment and long-term potentiation, acting downstream of a Bcl11b/C1ql2 transcriptional pathway [PMID:38358390]. Acting as a transsynaptic adhesion molecule, Nrxn3 is required for ribbon-synapse maturation in hair cells, where loss causes synapses to fail to pair over time and reduces pre- and postsynaptic responses in mouse and zebrafish [PMID:39254120, PMID:38410471]. Neurexin-3 also forms a complex with its ligand neuroligin-1 in the hippocampus linked to synaptic plasticity [PMID:40286836], and its expression in the central amygdala attenuates nociceptive orofacial pain by limiting neuronal activity in the pain pathway [PMID:41466820]. Loss-of-function variants in NRXN3 cause an autosomal recessive neurodevelopmental syndrome with developmental delay, movement disorder, and behavioral problems, consistent with Nrxn3α/β knockout mice [PMID:36898513]. NRXN3 transcription is repressed by FoxQ1 and positively regulated by ZNF582, linking its expression to tumor proliferation, migration, and metastasis [PMID:23383267, PMID:33038291]; a distinct non-neuronal role has it competitively block RSK1-mediated phosphorylation of caspase-3 to promote caspase-3/GSDME pyroptosis in cholangiocarcinoma [PMID:40324630]. Beyond these contexts, the molecular determinants of its broad non-neuronal expression remain uncharacterized in the available corpus.","teleology":[{"year":2002,"claim":"Established that NRXN3 expression is not restricted to neurons and that tissue-specific splice variants exist, raising the question of non-synaptic adhesion roles.","evidence":"RT-PCR tissue panel and characterization of heart-specific splicing variants","pmids":["12379233"],"confidence":"Medium","gaps":["Dystroglycan/ECM complex participation inferred, not shown by co-IP or pulldown","Functional role of cardiac isoforms not tested"]},{"year":2013,"claim":"Identified NRXN3 as a transcriptional target whose repression has cellular consequences, showing FoxQ1 directly binds and silences the NRXN3 promoter to promote glioma proliferation and migration.","evidence":"ChIP and luciferase reporter assays with knockdown/overexpression and proliferation/migration readouts in glioma cells","pmids":["23383267"],"confidence":"Medium","gaps":["Does not establish which NRXN3 protein function mediates the tumor phenotype","Single lab"]},{"year":2020,"claim":"Extended NRXN3 transcriptional control by showing ZNF582 directly activates NRXN3, and that restoring NRXN3 reverses pro-metastatic effects, linking NRXN3 expression to metastasis suppression.","evidence":"ChIP-seq/ChIP-qPCR, luciferase, bisulfite pyrosequencing, migration/invasion and in vivo metastasis rescue in nasopharyngeal carcinoma","pmids":["33038291"],"confidence":"Medium","gaps":["Mechanism by which NRXN3 suppresses metastasis not resolved","Single lab"]},{"year":2023,"claim":"Connected NRXN3 to human disease, demonstrating that biallelic loss-of-function variants cause an autosomal recessive neurodevelopmental syndrome consistent with knockout mice.","evidence":"Whole exome sequencing, CRISPR-edited cell functional studies, and phenotype comparison to Nrxn3α/β KO mice","pmids":["36898513"],"confidence":"Medium","gaps":["Molecular consequence of variants on synaptic function not directly assayed","Limited functional mechanistic detail"]},{"year":2024,"claim":"Defined a precise splice-variant-specific molecular interaction, showing Nrxn3(25b+) directly binds C1ql2 to control synaptic vesicle recruitment and LTP downstream of the Bcl11b/C1ql2 pathway.","evidence":"Conditional mouse KO, LTP electrophysiology, non-binding C1ql2 mutant recapitulation, and epistasis analysis at mossy fiber–CA3 synapses","pmids":["38358390"],"confidence":"High","gaps":["Structural basis of the C1ql2-Nrxn3(25b+) interaction not resolved","Generalizability to other circuits unknown"]},{"year":2024,"claim":"Established a transsynaptic role in synapse maturation, showing Nrxn3 is required for hair-cell ribbon-synapse pairing across two vertebrate models.","evidence":"Mouse and zebrafish KO with confocal imaging, electrophysiology, and behavioral assays","pmids":["39254120","38410471"],"confidence":"High","gaps":["Identity of the postsynaptic partner mediating pairing not defined","Splice-variant dependence in hair cells not resolved"]},{"year":2025,"claim":"Revealed an unexpected non-neuronal, non-adhesion function, showing NRXN3 competitively blocks RSK1-caspase-3 binding to stabilize caspase-3 and promote GSDME-dependent pyroptosis.","evidence":"Genome-scale CRISPR screen, IP-MS, and in vitro/in vivo functional experiments in intrahepatic cholangiocarcinoma","pmids":["40324630"],"confidence":"Medium","gaps":["Which NRXN3 isoform mediates this cytoplasmic interaction unknown","Reconciliation with extracellular adhesion role not addressed","Single lab"]},{"year":2025,"claim":"Linked NRXN3 to behavioral plasticity, indicating Nrxn3 in the central amygdala attenuates nociceptive orofacial pain and that a hippocampal NRXN3-NLGN1 complex tracks stress-induced depression susceptibility.","evidence":"Rat central amygdala shRNA knockdown with von Frey and c-Fos readouts; maternal separation model with Western blot and morphological analysis","pmids":["41466820","40286836"],"confidence":"Medium","gaps":["NRXN3-NLGN1 complex inferred from co-expression, not direct co-IP","Causal directionality in depression model not established"]},{"year":null,"claim":"How NRXN3 splice-variant selection is coordinated across tissues, and how its presynaptic adhesion activity relates mechanistically to its non-neuronal cytoplasmic functions, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking adhesion and pyroptosis functions","Postsynaptic partners for many circuits not mapped","Structural basis of ligand interactions unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,1,7]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,1,8]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[0,7]}],"complexes":[],"partners":["C1QL2","NLGN1","RSK1","CASP3"],"other_free_text":[]}},"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 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This C1ql2-Nrxn3(25b+) interaction regulates synaptic vesicle recruitment and long-term potentiation. Disruption of this interaction (via non-binding C1ql2 mutant or dentate gyrus-specific Nrxn3 deletion) recapitulates the Bcl11b and C1ql2 mutant synaptic phenotypes, placing Nrxn3(25b+) downstream of the Bcl11b/C1ql2 transcriptional pathway.\",\n      \"method\": \"In vivo mouse genetics (conditional KO), in vitro electrophysiology (LTP recording), expression of non-binding C1ql2 mutant, direct interaction assay, epistasis analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including KO, non-binding mutant rescue/recapitulation, and electrophysiological functional readouts in a single rigorous study\",\n      \"pmids\": [\"38358390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Nrxn3, functioning as a presynaptic adhesion molecule, is essential for ribbon-synapse maturation in hair cells. Loss of Nrxn3 in both mouse and zebrafish leads to significantly fewer intact ribbon synapses; in zebrafish, initial pre- and postsynapse numbers are normal but synapses fail to pair over time, resulting in postsynapse loss. A 60% loss of ribbon synapses in nrxn3 zebrafish mutants dramatically reduces pre- and postsynaptic responses.\",\n      \"method\": \"Mouse and zebrafish genetic KO, confocal imaging of synaptic markers, electrophysiology (pre- and postsynaptic response recording), behavioral assays (acoustic startle response)\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent vertebrate model systems (mouse and zebrafish KO), multiple orthogonal methods (imaging, electrophysiology, behavior), replicated finding between peer-reviewed paper (PMID:39254120) and preprint (PMID:38410471)\",\n      \"pmids\": [\"39254120\", \"38410471\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"NRXN3 is expressed not only in neurons but also in heart, lung, pancreas, placenta, liver, and kidney. Heart-specific splicing variants of NRXN3 were identified and characterized, and cardiac isoforms of NRXN3 likely participate in a complex involving dystroglycan and extracellular matrix proteins involved in intercellular connections.\",\n      \"method\": \"RT-PCR, tissue expression panel, characterization of alternative splicing variants\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct identification of tissue-specific splicing variants and proposed complex participation, but dystroglycan interaction was inferred, not directly demonstrated by co-IP/pulldown\",\n      \"pmids\": [\"12379233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"FoxQ1 directly binds the NRXN3 promoter region and suppresses its transcriptional activity, leading to downregulation of NRXN3 expression. This FoxQ1-mediated repression of NRXN3 promotes glioma cell proliferation and migration, as depletion of FoxQ1 reduces these capacities.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), luciferase reporter assay, stable knockdown/overexpression clones, MTT proliferation assay, transwell migration assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding confirmed by ChIP and luciferase assay, with functional cellular readouts; single lab study\",\n      \"pmids\": [\"23383267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The transcription factor ZNF582 directly regulates transcription of NRXN3 (and Nectin-3). Hypermethylation of the ZNF582 promoter reduces ZNF582 expression, leading to downregulation of NRXN3. Restoration of NRXN3 reverses the pro-metastatic effect of ZNF582 loss in nasopharyngeal carcinoma.\",\n      \"method\": \"ChIP-seq, ChIP-qPCR, luciferase reporter assay, bisulfite pyrosequencing, in vitro migration/invasion assays, in vivo metastasis models, rescue experiments\",\n      \"journal\": \"Cancer communications (London, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding confirmed by ChIP-seq and ChIP-qPCR with luciferase validation and rescue experiments; single lab\",\n      \"pmids\": [\"33038291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Nrxn3beta mRNA expression is upregulated in the globus pallidus of mice developing short-term cocaine appetence, implicating NRXN3 adhesion molecules in synaptic plasticity of basal ganglia neurons involved in indirect pathways of reward-related learning.\",\n      \"method\": \"mRNA quantification in dissected brain regions after cocaine exposure in mice\",\n      \"journal\": \"Neuroreport\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single method (mRNA expression measurement), no direct mechanistic manipulation of Nrxn3\",\n      \"pmids\": [\"18418251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NRXN3 competitively blocks caspase-3 binding to RSK1, thereby inhibiting RSK1-dependent phosphorylation of caspase-3 at T152. Inhibition of this phosphorylation impairs caspase-3 interaction with the ubiquitin ligase component FBXO1, enhancing caspase-3 stability and facilitating caspase-3/GSDME-dependent pyroptotic cell death and chemosensitivity in intrahepatic cholangiocarcinoma.\",\n      \"method\": \"Genome-scale CRISPR-Cas9 screen, RNA-seq, immunoprecipitation-mass spectrometry (IP-MS), in vitro and in vivo functional experiments\",\n      \"journal\": \"Journal of advanced research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — IP-MS identified complex, CRISPR screen and in vivo validation; single lab, non-neuronal context atypical for NRXN3\",\n      \"pmids\": [\"40324630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NRXN3 forms a complex with its ligand neuroligin 1 (NLGN1) in the hippocampus. Downregulation of both NRXN3 and NLGN1 precedes synaptic plasticity alterations (reduced dendritic branch and spine lengths) and depression-related behaviors induced by maternal separation stress in rats, suggesting the NRXN3-NLGN1 complex mediates synaptic plasticity changes underlying stress-induced depression susceptibility.\",\n      \"method\": \"Rat maternal separation model, Western blot, behavioral assays, hippocampal morphological analysis (branch and spine quantification)\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — complex formation inferred from co-expression/downregulation data; direct binding not demonstrated by co-IP in this paper; single lab\",\n      \"pmids\": [\"40286836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Knockdown of Nrxn3 in the central amygdala of rats significantly increased the nociceptive pain response to inflammatory orofacial pain (myofascial pain model) and increased c-Fos levels in the central amygdala, lateral parabrachial nucleus, trigeminal ganglia, and trigeminal nucleus caudalis, indicating that Nrxn3 expression in the central amygdala attenuates nociceptive orofacial pain by reducing neuronal activity in the orofacial pain pathway.\",\n      \"method\": \"shRNA knockdown (stereotaxic infusion), von Frey filament testing, c-Fos immunostaining, meal duration measurement\",\n      \"journal\": \"Neurobiology of pain (Cambridge, Mass.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — loss-of-function with defined cellular phenotype (nociception) and neuronal activity readout (c-Fos); single lab, single method per endpoint\",\n      \"pmids\": [\"41466820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A circular RNA originating from the Nrxn3 locus (circNrxn3) binds the splicing factor SAM68 (RNA immunoprecipitation), and its knockdown alters splicing of Nrxn3 mRNA and expression of genes in learning/memory pathways, enhancing sucrose self-administration and motivation for reward in the orbitofrontal cortex.\",\n      \"method\": \"RNA immunoprecipitation, RNA sequencing, qPCR, in vivo shRNA knockdown, sucrose self-administration behavioral assay\",\n      \"journal\": \"Progress in neurobiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — findings concern a circRNA product of the NRXN3 locus rather than the canonical NRXN3 protein; excluded from protein-level mechanistic set per guidelines. NOTE: This entry is retained to document the circRNA-SAM68 splicing interaction affecting Nrxn3 mRNA as a regulatory mechanism, but confidence is downgraded given the non-protein-coding product focus.\",\n      \"pmids\": [\"38036039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Loss-of-function variants in NRXN3 (including homozygous and compound heterozygous missense/splice-site mutations validated by CRISPR-edited cell functional studies) cause a novel autosomal recessive neurodevelopmental syndrome with developmental delay, movement disorder, and behavioral problems, phenotypically consistent with homozygous Nrxn3α/β knockout mice.\",\n      \"method\": \"Whole exome sequencing, CRISPR-edited cell lines, in-silico analysis, phenotype-genotype correlation with mouse KO model\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR-edited cell functional validation plus mouse KO phenotype comparison; single lab, limited functional mechanistic detail in abstract\",\n      \"pmids\": [\"36898513\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NRXN3 encodes a presynaptic cell adhesion molecule (neurexin-3) that functions in synaptic organization: it is required for ribbon-synapse maturation in hair cells (via a conserved role in synapse pairing), mediates hippocampal mossy fiber-CA3 synapse function and LTP as part of a Bcl11b/C1ql2/Nrxn3(25b+) signaling pathway, forms a complex with neuroligin-1 to regulate synaptic plasticity, modulates nociceptive signaling in the central amygdala, and has its transcription regulated by FoxQ1 and ZNF582; additionally, non-neuronal roles include blocking RSK1-mediated phosphorylation of caspase-3 to regulate pyroptosis in cholangiocarcinoma, and heart-specific isoforms associate with dystroglycan-containing extracellular matrix complexes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NRXN3 encodes neurexin-3, a presynaptic cell adhesion molecule that organizes and matures synaptic connections across multiple neural circuits [#0, #1]. At hippocampal mossy fiber–CA3 synapses, a specific splice variant, Nrxn3(25b+), directly binds C1ql2 to regulate synaptic vesicle recruitment and long-term potentiation, acting downstream of a Bcl11b/C1ql2 transcriptional pathway [#0]. Acting as a transsynaptic adhesion molecule, Nrxn3 is required for ribbon-synapse maturation in hair cells, where loss causes synapses to fail to pair over time and reduces pre- and postsynaptic responses in mouse and zebrafish [#1]. Neurexin-3 also forms a complex with its ligand neuroligin-1 in the hippocampus linked to synaptic plasticity [#7], and its expression in the central amygdala attenuates nociceptive orofacial pain by limiting neuronal activity in the pain pathway [#8]. Loss-of-function variants in NRXN3 cause an autosomal recessive neurodevelopmental syndrome with developmental delay, movement disorder, and behavioral problems, consistent with Nrxn3α/β knockout mice [#10]. NRXN3 transcription is repressed by FoxQ1 and positively regulated by ZNF582, linking its expression to tumor proliferation, migration, and metastasis [#3, #4]; a distinct non-neuronal role has it competitively block RSK1-mediated phosphorylation of caspase-3 to promote caspase-3/GSDME pyroptosis in cholangiocarcinoma [#6]. Beyond these contexts, the molecular determinants of its broad non-neuronal expression remain uncharacterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established that NRXN3 expression is not restricted to neurons and that tissue-specific splice variants exist, raising the question of non-synaptic adhesion roles.\",\n      \"evidence\": \"RT-PCR tissue panel and characterization of heart-specific splicing variants\",\n      \"pmids\": [\"12379233\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Dystroglycan/ECM complex participation inferred, not shown by co-IP or pulldown\", \"Functional role of cardiac isoforms not tested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified NRXN3 as a transcriptional target whose repression has cellular consequences, showing FoxQ1 directly binds and silences the NRXN3 promoter to promote glioma proliferation and migration.\",\n      \"evidence\": \"ChIP and luciferase reporter assays with knockdown/overexpression and proliferation/migration readouts in glioma cells\",\n      \"pmids\": [\"23383267\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not establish which NRXN3 protein function mediates the tumor phenotype\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Extended NRXN3 transcriptional control by showing ZNF582 directly activates NRXN3, and that restoring NRXN3 reverses pro-metastatic effects, linking NRXN3 expression to metastasis suppression.\",\n      \"evidence\": \"ChIP-seq/ChIP-qPCR, luciferase, bisulfite pyrosequencing, migration/invasion and in vivo metastasis rescue in nasopharyngeal carcinoma\",\n      \"pmids\": [\"33038291\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which NRXN3 suppresses metastasis not resolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Connected NRXN3 to human disease, demonstrating that biallelic loss-of-function variants cause an autosomal recessive neurodevelopmental syndrome consistent with knockout mice.\",\n      \"evidence\": \"Whole exome sequencing, CRISPR-edited cell functional studies, and phenotype comparison to Nrxn3α/β KO mice\",\n      \"pmids\": [\"36898513\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular consequence of variants on synaptic function not directly assayed\", \"Limited functional mechanistic detail\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined a precise splice-variant-specific molecular interaction, showing Nrxn3(25b+) directly binds C1ql2 to control synaptic vesicle recruitment and LTP downstream of the Bcl11b/C1ql2 pathway.\",\n      \"evidence\": \"Conditional mouse KO, LTP electrophysiology, non-binding C1ql2 mutant recapitulation, and epistasis analysis at mossy fiber–CA3 synapses\",\n      \"pmids\": [\"38358390\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the C1ql2-Nrxn3(25b+) interaction not resolved\", \"Generalizability to other circuits unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established a transsynaptic role in synapse maturation, showing Nrxn3 is required for hair-cell ribbon-synapse pairing across two vertebrate models.\",\n      \"evidence\": \"Mouse and zebrafish KO with confocal imaging, electrophysiology, and behavioral assays\",\n      \"pmids\": [\"39254120\", \"38410471\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the postsynaptic partner mediating pairing not defined\", \"Splice-variant dependence in hair cells not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed an unexpected non-neuronal, non-adhesion function, showing NRXN3 competitively blocks RSK1-caspase-3 binding to stabilize caspase-3 and promote GSDME-dependent pyroptosis.\",\n      \"evidence\": \"Genome-scale CRISPR screen, IP-MS, and in vitro/in vivo functional experiments in intrahepatic cholangiocarcinoma\",\n      \"pmids\": [\"40324630\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which NRXN3 isoform mediates this cytoplasmic interaction unknown\", \"Reconciliation with extracellular adhesion role not addressed\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Linked NRXN3 to behavioral plasticity, indicating Nrxn3 in the central amygdala attenuates nociceptive orofacial pain and that a hippocampal NRXN3-NLGN1 complex tracks stress-induced depression susceptibility.\",\n      \"evidence\": \"Rat central amygdala shRNA knockdown with von Frey and c-Fos readouts; maternal separation model with Western blot and morphological analysis\",\n      \"pmids\": [\"41466820\", \"40286836\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"NRXN3-NLGN1 complex inferred from co-expression, not direct co-IP\", \"Causal directionality in depression model not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NRXN3 splice-variant selection is coordinated across tissues, and how its presynaptic adhesion activity relates mechanistically to its non-neuronal cytoplasmic functions, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking adhesion and pyroptosis functions\", \"Postsynaptic partners for many circuits not mapped\", \"Structural basis of ligand interactions unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 1, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 1, 8]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"C1QL2\", \"NLGN1\", \"RSK1\", \"CASP3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}