{"gene":"NRXN1","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2015,"finding":"Heterozygous NRXN1 mutations selectively impair neurotransmitter release in human neurons without changing neuronal differentiation or synapse formation. Both heterozygous NRXN1 mutations also increased the levels of CASK, a critical synaptic scaffolding protein that binds to neurexin-1.","method":"Human ESC-derived isogenic neurons with conditional heterozygous NRXN1 deletions; electrophysiology measuring neurotransmitter release; western blot for CASK levels","journal":"Cell stem cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — isogenic human neuronal system with conditional deletions, two independent NRXN1 mutations tested, multiple orthogonal readouts (electrophysiology + protein quantification), subsequently replicated in a multicenter study","pmids":["26279266"],"is_preprint":false},{"year":2021,"finding":"Heterozygous NRXN1 deletions robustly impair synaptic function in human neurons regardless of genetic background, manifesting as decreased spontaneous synaptic events, evoked synaptic responses, and synaptic paired-pulse depression. NRXN1 deletions also produce a reproducible increase in CASK protein levels. Nrxn1-deficient mouse neurons generated by the same method did NOT exhibit impaired neurotransmitter release, suggesting a human-specific phenotype.","method":"Multicenter study using patient-derived iPSC neurons and engineered human neurons with heterozygous NRXN1 deletions; electrophysiology; western blot for CASK","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multicenter independent replication across two laboratories, patient-derived and engineered lines, multiple electrophysiological readouts plus protein quantification","pmids":["34035170"],"is_preprint":false},{"year":2011,"finding":"Truncating mutations in NRXN1 result in proteins that fail to promote synaptic differentiation in neuron coculture and fail to bind either of the established postsynaptic binding partners LRRTM2 or NLGN2 in cell binding assays.","method":"Neuron coculture synaptic differentiation assay; cell binding assays for LRRTM2 and NLGN2 interactions","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal functional assays (coculture synaptogenesis + cell binding) in a single study, but single lab","pmids":["21424692"],"is_preprint":false},{"year":2020,"finding":"Missense variants in the LNS4 domain of NRXN1α (D772G and R856W) reduce cell surface expression of NRXN1α. Variants T737M and D772G decrease NRXN1α-NLGN1 interaction. In silico 3D structural modeling indicated T737M and D772G destabilize the rod-shaped structure of LNS2-LNS5 domains, and D772G and R856W disturb N-glycan conformations for transport signaling.","method":"In vitro cell surface expression assay; in vitro binding assay for NRXN1α-NLGN1 interaction; in silico 3D structural modeling","journal":"Journal of neurodevelopmental disorders","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (surface expression, binding assay, structural modeling) in single lab","pmids":["32942984"],"is_preprint":false},{"year":2009,"finding":"In C. elegans, nrx-1 (ortholog of human NRXN1) deficiency causes defects in exploratory capacity, sinusoidal postural movements, and gentle touch response. Behavioral defects of nrx-1 mutants involve defects in ACh and/or GABA inputs. The defective behavioral phenotypes were rescued by transgenic expression of either human alpha- or beta-NRXN1 isoforms under the nrx-1 promoter, demonstrating functional conservation.","method":"C. elegans nrx-1 loss-of-function mutants; behavioral assays (exploration, movement, touch response); pharmacological assays with aldicarb, levamisole, pentylenetetrazole; transgenic rescue with human NRXN1 isoforms","journal":"Journal of visualized experiments : JoVE","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined behavioral phenotypes, pharmacological dissection of neurotransmitter pathways, transgenic rescue with human protein; single lab","pmids":["20010541"],"is_preprint":false},{"year":2013,"finding":"Human alpha- and beta-NRXN1 isoforms rescue behavioral impairments (exploratory, postural movement, touch response defects) of C. elegans nrx-1-deficient mutants, demonstrating that the functional mechanisms of neurexin are conserved between nematode and human.","method":"Transgenic rescue of C. elegans nrx-1 null mutants with human NRXN1α and NRXN1β; behavioral assays; pharmacological analysis","journal":"Genes, brain, and behavior","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic rescue with human isoforms in a defined genetic background, multiple behavioral readouts, single lab","pmids":["23638761"],"is_preprint":false},{"year":2009,"finding":"In Drosophila, overexpression of fly Nrx-I (NRXN1 ortholog) can reorganize synaptic morphology, induce increased density of active zones, and determine the level of the presynaptic active-zone protein bruchpilot, indicating a role in presynaptic active zone organization.","method":"Drosophila overexpression and loss-of-function; synaptic morphology analysis; immunostaining for active zone protein bruchpilot","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function in Drosophila with defined molecular readout (bruchpilot levels), single lab","pmids":["19896112"],"is_preprint":false},{"year":2023,"finding":"NRXN1 heterozygous deletions in both isogenic and schizophrenia patient backgrounds impact molecular pathways associated with ubiquitin-proteasome system, alternative splicing, and synaptic signaling in maturing glutamatergic and GABAergic neurons in human brain organoids. SCZ-NRXN1 deletions specifically perturbed developmental trajectories of early neural progenitors. Both deletion backgrounds led to long-lasting changes in spontaneous and synchronous neuronal networks as measured by calcium imaging.","method":"Human pluripotent stem cell-derived forebrain organoids; single-cell transcriptomics; calcium imaging of neuronal networks","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isogenic and patient background comparisons, single-cell transcriptomics plus calcium imaging, single lab","pmids":["37355690"],"is_preprint":false},{"year":2019,"finding":"Cells with bi-allelic NRXN1-alpha deletion show skewed fate toward radial glia-like cell identity, higher proportion of astroglia differentiation, and neurons with significantly depressed calcium signaling activity and impaired maturation action potential profiles compared to controls.","method":"Human iPSC-derived neural stem cells from ASD patient with bi-allelic NRXN1-alpha deletion; single-cell RNA-seq; calcium imaging; electrophysiology","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (scRNA-seq, calcium imaging, electrophysiology) on patient-derived cells, single lab","pmids":["31302032"],"is_preprint":false},{"year":2019,"finding":"NRXN1 deletion increases astrocyte differentiation in human neuroepithelial stem cells via Notch pathway dysregulation. Treatment with the Notch inhibitor DAPT reversed the altered differentiation, placing NRXN1 upstream of Notch-dependent gliogenesis.","method":"Human neuroepithelial stem cells from ASD patient with bi-allelic NRXN1 deletion; GFAP immunofluorescence; DAPT Notch inhibitor rescue experiment","journal":"Frontiers in genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function in patient-derived cells with pharmacological rescue defining Notch pathway epistasis, single lab","pmids":["31316548"],"is_preprint":false},{"year":2021,"finding":"NRXN1 overexpression and knockdown in vivo in rats affected learning and memory, and altered expression of synapse-related genes PSD95, SYN1, GAP43, and NLGN1. NRXN1 expression changes in primary hippocampal neurons in vitro also modulated synapse-related gene expression, supporting a role for NRXN1 in maintaining synaptic plasticity.","method":"In vivo NRXN1 overexpression and shRNA knockdown in rat hippocampus; Morris water maze; western blot/qPCR for synapse genes; primary hippocampal neuron in vitro experiments","journal":"Experimental neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and in vitro gain/loss-of-function with behavioral and molecular readouts, single lab","pmids":["34228999"],"is_preprint":false},{"year":2023,"finding":"NRXN1 downregulation in the medial prefrontal cortex of rats induced anxiety-like behaviors, abnormal social phenotypes, and impaired neurite outgrowth. Proteomic analysis revealed alterations in pathways related to extracellular matrix, cell membrane, and morphologic change.","method":"In vivo shRNA knockdown of NRXN1 in rat medial PFC; behavioral tests; TMT-based proteomics; immunoblotting","journal":"Journal of neurodevelopmental disorders","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — region-specific in vivo knockdown with behavioral and proteomic readouts, single lab","pmids":["36737720"],"is_preprint":false},{"year":2023,"finding":"NRXN1 mediates thalamic axon contact with primate-enriched outer radial glia in cortical-thalamic assembloids. Genetic perturbation of NRXN1 in thalamic neurons reduced these contacts and attenuated cortical upper-layer neurogenesis, revealing a role for NRXN1 in thalamus-to-cortex signaling during development.","method":"Cortical-thalamic organoid fusion (assembloid) model; single-nuclei RNA-sequencing; cellular imaging; NRXN1 genetic perturbation in thalamic neurons; quantification of outer radial glia contacts and upper-layer neurogenesis","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, single lab, novel assembloid system with genetic perturbation but limited replication","pmids":["bio_10.1101_2025.04.25.650717"],"is_preprint":true},{"year":2021,"finding":"ASD-associated NRXN1 deletions selectively enhance excitatory synaptic signaling without affecting inhibitory synapses, whereas SCZ-associated NRXN1 deletions reduce both excitatory and inhibitory synaptic transmission. ASD deletions also impair homeostatic synaptic plasticity (synaptic scaling) and generate irregular firing patterns at the network level.","method":"iPSC-derived cortical neurons from ASD and SCZ patients with NRXN1 deletions; whole-cell patch clamp electrophysiology; multi-electrode array network analysis; synaptic scaling assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal electrophysiological methods comparing ASD vs. SCZ patient-derived neurons, single lab","pmids":["41865373"],"is_preprint":false},{"year":2023,"finding":"NRXN1 forms a transsynaptic complex with CBLN1 and GluD1 (NRXN1-CBLN1-GluD1) at VMHvl-to-arcuate AgRP/NPY neuron excitatory synapses. UBE3A impairs this synapse by decreasing Cbln1 gene expression, and heterozygous deficiency of presynaptic Nrxn1 synergizes with increased UBE3A to increase aggression.","method":"Mouse genetic models; targeted deletion experiments; chemogenetic/optogenetic circuit manipulation; behavioral aggression assays; epistasis between Ube3a, Nrxn1, and Grid1","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, circuit-level genetic epistasis with behavioral readout, single lab, complex multi-gene interactions","pmids":["36909588"],"is_preprint":true},{"year":2025,"finding":"Schizophrenia-associated 3' deletion NRXN1 isoforms can produce gain-of-function behavioral phenotypes in C. elegans more severe than the nrx-1 null mutant, demonstrating that patient-derived 3' deletion variants are actively pathogenic rather than simply loss-of-function. Several isoforms also displayed aberrant accumulation in neuronal cell bodies.","method":"Expression of 8 human NRXN1 isoform variants (including 4 patient-derived 3' deletion variants) in C. elegans neurons; behavioral assays (food deprivation response, social feeding); protein localization imaging","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, single lab, C. elegans heterologous expression system, but direct isoform comparison with defined behavioral readouts","pmids":["bio_10.1101_2025.08.29.672776"],"is_preprint":true},{"year":2025,"finding":"NRXN1 undergoes cell-type-specific alternative splicing in human brain, with distinct isoform repertoires in interneuron subtypes, pyramidal neurons, and glial lineages. NRXN1 isoform profiles are established during early development and remain stable during neuronal maturation. In schizophrenia patient-derived organoids with NRXN1 deletions, antisense oligonucleotide targeting of mutant splice junctions reduces gain-of-function NRXN1 isoforms in a cell-type-specific manner.","method":"Single-cell transcriptomics combined with targeted NRXN1 transcript enrichment and long-read sequencing; hiPSC cortical organoids; ASO treatment with isoform quantification","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, novel integrative sequencing approach, single lab; ASO functional experiment is initial proof-of-concept","pmids":["bio_10.1101_2025.11.11.687875"],"is_preprint":true},{"year":2013,"finding":"NRXN1 knockdown in human neural stem cells during differentiation altered expression of cell adhesion pathway genes and neuron differentiation pathway genes. Half reduction of NRXN1 expression resulted in time-dependent reduction of astrocyte marker GFAP, reproduced in both hiPSCs and hESCs.","method":"shRNAmir-based NRXN1 knockdown in hiPSC- and hESC-derived neural stem cells; RNA-Seq transcriptome profiling; qPCR; immunostaining for GFAP","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — controlled knockdown with transcriptome-wide readout, replicated in two stem cell models, single lab","pmids":["23536886"],"is_preprint":false}],"current_model":"NRXN1 encodes a presynaptic cell-adhesion molecule that binds postsynaptic partners including neuroligins (NLGN1, NLGN2) and LRRTMs to organize trans-synaptic complexes; heterozygous loss of NRXN1 selectively impairs neurotransmitter release in human neurons (a human-specific phenotype not observed in mouse neurons), increases CASK scaffolding protein levels, and—depending on deletion context—either reduces (SCZ) or enhances (ASD) excitatory synaptic transmission while also impairing homeostatic synaptic plasticity; NRXN1 additionally mediates thalamic axon contact with outer radial glia to promote cortical upper-layer neurogenesis, regulates synaptic-gene expression networks (PSD95, SYN1, NLGN1) that support synaptic plasticity and learning, and forms part of a NRXN1-CBLN1-GluD1 transsynaptic complex at specific hypothalamic synapses; its extensive alternative splicing generates cell-type-specific isoform repertoires established early in development, and 3' deletion isoforms found in schizophrenia patients can act as gain-of-function pathogenic variants."},"narrative":{"mechanistic_narrative":"NRXN1 encodes a presynaptic cell-adhesion molecule that organizes trans-synaptic complexes and controls neurotransmitter release [PMID:26279266, PMID:34035170]. Through its LNS domains it binds postsynaptic partners including neuroligins (NLGN1, NLGN2) and LRRTM2, and truncating or missense variants that disrupt these interactions or reduce cell-surface expression fail to promote synaptic differentiation [PMID:21424692, PMID:32942984]. In human neurons, heterozygous NRXN1 loss selectively impairs neurotransmitter release and reproducibly elevates the scaffolding protein CASK, a phenotype not recapitulated in mouse neurons and therefore human-specific [PMID:26279266, PMID:34035170]. The functional consequences of NRXN1 disruption are deletion-context dependent: ASD-associated deletions enhance excitatory transmission and impair homeostatic synaptic scaling, whereas SCZ-associated deletions reduce both excitatory and inhibitory transmission [PMID:41865373]. Beyond synaptic adhesion, NRXN1 acts during neurodevelopment, where its loss skews neural progenitor fate toward astroglia through Notch pathway dysregulation [PMID:31302032, PMID:31316548] and where it mediates thalamic axon contact to support cortical upper-layer neurogenesis [PMID:bio_10.1101_2025.04.25.650717]. NRXN1 expression levels also tune networks of synapse-related genes (PSD95, SYN1, NLGN1) that underlie learning and memory [PMID:34228999]. Functional conservation is demonstrated by rescue of C. elegans nrx-1 behavioral deficits with human NRXN1 isoforms [PMID:20010541, PMID:23638761], and schizophrenia-associated 3' deletion isoforms behave as gain-of-function pathogenic variants rather than simple loss-of-function [PMID:bio_10.1101_2025.08.29.672776].","teleology":[{"year":2009,"claim":"Establishing that neurexin function is evolutionarily conserved and acts in neurotransmitter signaling, by testing whether the invertebrate ortholog phenotype could be rescued by the human gene.","evidence":"C. elegans nrx-1 loss-of-function mutants with behavioral/pharmacological assays and transgenic rescue using human NRXN1 isoforms; Drosophila gain/loss-of-function with active-zone readouts","pmids":["20010541","19896112"],"confidence":"Medium","gaps":["Did not define mammalian molecular partners","Behavioral readouts do not localize the molecular defect to specific synapses"]},{"year":2011,"claim":"Linking disease-associated truncating mutations to a molecular mechanism by showing they abolish binding to postsynaptic partners and synaptogenic activity.","evidence":"Neuron coculture synaptic differentiation assay and cell binding assays for LRRTM2 and NLGN2","pmids":["21424692"],"confidence":"Medium","gaps":["Single lab","Did not test electrophysiological consequences in human neurons"]},{"year":2013,"claim":"Revealing a developmental role beyond synapse adhesion, that NRXN1 dosage influences neural stem cell differentiation and gliogenesis.","evidence":"shRNAmir knockdown in hiPSC- and hESC-derived neural stem cells with RNA-Seq and GFAP immunostaining; functional conservation rescue in C. elegans","pmids":["23536886","23638761"],"confidence":"Medium","gaps":["Mechanism linking NRXN1 to differentiation genes not defined","Did not connect to synaptic phenotype"]},{"year":2015,"claim":"Isolating the core human synaptic phenotype, that heterozygous NRXN1 loss selectively impairs neurotransmitter release without altering differentiation or synapse number, and elevates CASK.","evidence":"Human ESC-derived isogenic conditional heterozygous deletion neurons with electrophysiology and CASK western blot","pmids":["26279266"],"confidence":"High","gaps":["Causal role of elevated CASK in the release defect not established","Single genetic background at this stage"]},{"year":2019,"claim":"Defining the developmental pathway through which NRXN1 controls cell fate, placing it upstream of Notch-dependent gliogenesis.","evidence":"Patient-derived bi-allelic NRXN1-alpha deletion neural stem cells with scRNA-seq, calcium imaging, electrophysiology, and DAPT Notch-inhibitor rescue","pmids":["31302032","31316548"],"confidence":"Medium","gaps":["Molecular link between NRXN1 and Notch signaling unresolved","Bi-allelic deletion not directly comparable to heterozygous disease state"]},{"year":2021,"claim":"Confirming the human-specificity and robustness of the release phenotype across labs and backgrounds, and dissecting how ASD versus SCZ deletions diverge functionally.","evidence":"Multicenter patient-derived and engineered iPSC neurons with electrophysiology, CASK western blot, MEA network analysis, and synaptic scaling assays; parallel Nrxn1-deficient mouse neurons","pmids":["34035170","41865373"],"confidence":"High","gaps":["Molecular basis of the human-versus-mouse difference unknown","Why ASD and SCZ deletions produce opposite excitatory effects not mechanistically resolved"]},{"year":2021,"claim":"Connecting NRXN1 dosage to synaptic gene networks and behavior in an intact mammalian system.","evidence":"In vivo NRXN1 overexpression and shRNA knockdown in rat hippocampus and PFC, Morris water maze and social/anxiety behavioral tests, western blot/qPCR for synapse genes, and TMT proteomics","pmids":["34228999","36737720"],"confidence":"Medium","gaps":["Direct versus indirect regulation of synapse genes not distinguished","Single lab in vivo perturbations"]},{"year":2023,"claim":"Showing NRXN1 deletions perturb proteostasis, splicing, and developmental trajectories in maturing human neural tissue.","evidence":"hPSC-derived forebrain organoids in isogenic and SCZ backgrounds with single-cell transcriptomics and calcium imaging","pmids":["37355690"],"confidence":"Medium","gaps":["Causal hierarchy among UPS, splicing, and synaptic changes unresolved","Single lab"]},{"year":2023,"claim":"Extending NRXN1 function to a defined neural circuit and a specific transsynaptic complex.","evidence":"Mouse genetic, chemogenetic/optogenetic, and behavioral epistasis experiments defining a NRXN1-CBLN1-GluD1 complex at VMHvl-to-AgRP/NPY synapses (preprint)","pmids":["36909588"],"confidence":"Low","gaps":["Preprint, single lab","Complex architecture not biochemically reconstituted","Generalizability to other synapses untested"]},{"year":2023,"claim":"Identifying a developmental neurogenesis role in which NRXN1 mediates thalamic axon contact with outer radial glia.","evidence":"Cortical-thalamic assembloid model with single-nuclei RNA-seq, imaging, and NRXN1 genetic perturbation in thalamic neurons (preprint)","pmids":["bio_10.1101_2025.04.25.650717"],"confidence":"Low","gaps":["Preprint, novel system with limited replication","Postsynaptic/glial receptor mediating the contact not identified"]},{"year":2025,"claim":"Reframing schizophrenia 3' deletion variants as actively pathogenic gain-of-function isoforms rather than simple loss-of-function, and providing cell-type-resolved isoform maps with an ASO correction strategy.","evidence":"Expression of patient-derived 3' deletion isoforms in C. elegans with behavioral and localization readouts; single-cell long-read transcriptomics and ASO targeting in hiPSC organoids (preprints)","pmids":["bio_10.1101_2025.08.29.672776","bio_10.1101_2025.11.11.687875"],"confidence":"Low","gaps":["Preprints, single labs","Gain-of-function mechanism of 3' deletion isoforms not defined biochemically","ASO rescue is proof-of-concept only"]},{"year":null,"claim":"It remains unknown how elevated CASK mechanistically causes impaired neurotransmitter release and why this phenotype is human-specific.","evidence":"","pmids":[],"confidence":"High","gaps":["No causal demonstration that CASK accumulation drives the release deficit","Molecular determinant of the human-versus-mouse divergence unidentified","Structural basis for context-dependent ASD/SCZ phenotypic divergence unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,2,3]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,1,13]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[8,9,12]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[2,14]}],"complexes":["NRXN1-CBLN1-GluD1 transsynaptic complex"],"partners":["NLGN1","NLGN2","LRRTM2","CASK","CBLN1","GLUD1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P58400","full_name":"Neurexin-1-beta","aliases":["Neurexin I-beta"],"length_aa":472,"mass_kda":50.4,"function":"Neuronal cell surface protein involved in cell recognition and cell adhesion by forming intracellular junctions through binding to neuroligins (By similarity). Plays a role in formation of synaptic junctions (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. NRXN1B-CBLN2-GRID1 complex transduce presynaptic signals into postsynaptic NMDAR response (By similarity)","subcellular_location":"Presynaptic cell membrane","url":"https://www.uniprot.org/uniprotkb/P58400/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NRXN1","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/NRXN1","total_profiled":1310},"omim":[{"mim_id":"621407","title":"SCHIZOPHRENIA 17; SCZD17","url":"https://www.omim.org/entry/621407"},{"mim_id":"620973","title":"SYNAPTOTAGMIN-LIKE 3; SYTL3","url":"https://www.omim.org/entry/620973"},{"mim_id":"615029","title":"PRECEREBELLIN 4; CBLN4","url":"https://www.omim.org/entry/615029"},{"mim_id":"614332","title":"CHROMOSOME 2p16.3 DELETION SYNDROME","url":"https://www.omim.org/entry/614332"},{"mim_id":"614325","title":"PITT-HOPKINS-LIKE SYNDROME 2; PTHSL2","url":"https://www.omim.org/entry/614325"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Nucleoli","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":75.9}],"url":"https://www.proteinatlas.org/search/NRXN1"},"hgnc":{"alias_symbol":["KIAA0578","Hs.22998"],"prev_symbol":[]},"alphafold":{"accession":"P58400","domains":[{"cath_id":"2.60.120.200","chopping":"91-199_240-291","consensus_level":"high","plddt":96.9785,"start":91,"end":291}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P58400","model_url":"https://alphafold.ebi.ac.uk/files/AF-P58400-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P58400-F1-predicted_aligned_error_v6.png","plddt_mean":67.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NRXN1","jax_strain_url":"https://www.jax.org/strain/search?query=NRXN1"},"sequence":{"accession":"P58400","fasta_url":"https://rest.uniprot.org/uniprotkb/P58400.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P58400/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P58400"}},"corpus_meta":[{"pmid":"17989066","id":"PMC_17989066","title":"Comparative genome hybridization suggests a role for NRXN1 and APBA2 in schizophrenia.","date":"2007","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/17989066","citation_count":303,"is_preprint":false},{"pmid":"19896112","id":"PMC_19896112","title":"CNTNAP2 and NRXN1 are mutated in autosomal-recessive Pitt-Hopkins-like mental retardation and determine the level of a common synaptic protein in Drosophila.","date":"2009","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19896112","citation_count":269,"is_preprint":false},{"pmid":"21424692","id":"PMC_21424692","title":"Truncating mutations in NRXN2 and NRXN1 in autism spectrum disorders and schizophrenia.","date":"2011","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21424692","citation_count":229,"is_preprint":false},{"pmid":"20468056","id":"PMC_20468056","title":"Deletions of NRXN1 (neurexin-1) predispose to a wide spectrum of developmental disorders.","date":"2010","source":"American journal of medical genetics. 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Both heterozygous NRXN1 mutations also increased the levels of CASK, a critical synaptic scaffolding protein that binds to neurexin-1.\",\n      \"method\": \"Human ESC-derived isogenic neurons with conditional heterozygous NRXN1 deletions; electrophysiology measuring neurotransmitter release; western blot for CASK levels\",\n      \"journal\": \"Cell stem cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — isogenic human neuronal system with conditional deletions, two independent NRXN1 mutations tested, multiple orthogonal readouts (electrophysiology + protein quantification), subsequently replicated in a multicenter study\",\n      \"pmids\": [\"26279266\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Heterozygous NRXN1 deletions robustly impair synaptic function in human neurons regardless of genetic background, manifesting as decreased spontaneous synaptic events, evoked synaptic responses, and synaptic paired-pulse depression. NRXN1 deletions also produce a reproducible increase in CASK protein levels. Nrxn1-deficient mouse neurons generated by the same method did NOT exhibit impaired neurotransmitter release, suggesting a human-specific phenotype.\",\n      \"method\": \"Multicenter study using patient-derived iPSC neurons and engineered human neurons with heterozygous NRXN1 deletions; electrophysiology; western blot for CASK\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multicenter independent replication across two laboratories, patient-derived and engineered lines, multiple electrophysiological readouts plus protein quantification\",\n      \"pmids\": [\"34035170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Truncating mutations in NRXN1 result in proteins that fail to promote synaptic differentiation in neuron coculture and fail to bind either of the established postsynaptic binding partners LRRTM2 or NLGN2 in cell binding assays.\",\n      \"method\": \"Neuron coculture synaptic differentiation assay; cell binding assays for LRRTM2 and NLGN2 interactions\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal functional assays (coculture synaptogenesis + cell binding) in a single study, but single lab\",\n      \"pmids\": [\"21424692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Missense variants in the LNS4 domain of NRXN1α (D772G and R856W) reduce cell surface expression of NRXN1α. Variants T737M and D772G decrease NRXN1α-NLGN1 interaction. In silico 3D structural modeling indicated T737M and D772G destabilize the rod-shaped structure of LNS2-LNS5 domains, and D772G and R856W disturb N-glycan conformations for transport signaling.\",\n      \"method\": \"In vitro cell surface expression assay; in vitro binding assay for NRXN1α-NLGN1 interaction; in silico 3D structural modeling\",\n      \"journal\": \"Journal of neurodevelopmental disorders\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (surface expression, binding assay, structural modeling) in single lab\",\n      \"pmids\": [\"32942984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In C. elegans, nrx-1 (ortholog of human NRXN1) deficiency causes defects in exploratory capacity, sinusoidal postural movements, and gentle touch response. Behavioral defects of nrx-1 mutants involve defects in ACh and/or GABA inputs. The defective behavioral phenotypes were rescued by transgenic expression of either human alpha- or beta-NRXN1 isoforms under the nrx-1 promoter, demonstrating functional conservation.\",\n      \"method\": \"C. elegans nrx-1 loss-of-function mutants; behavioral assays (exploration, movement, touch response); pharmacological assays with aldicarb, levamisole, pentylenetetrazole; transgenic rescue with human NRXN1 isoforms\",\n      \"journal\": \"Journal of visualized experiments : JoVE\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined behavioral phenotypes, pharmacological dissection of neurotransmitter pathways, transgenic rescue with human protein; single lab\",\n      \"pmids\": [\"20010541\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Human alpha- and beta-NRXN1 isoforms rescue behavioral impairments (exploratory, postural movement, touch response defects) of C. elegans nrx-1-deficient mutants, demonstrating that the functional mechanisms of neurexin are conserved between nematode and human.\",\n      \"method\": \"Transgenic rescue of C. elegans nrx-1 null mutants with human NRXN1α and NRXN1β; behavioral assays; pharmacological analysis\",\n      \"journal\": \"Genes, brain, and behavior\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic rescue with human isoforms in a defined genetic background, multiple behavioral readouts, single lab\",\n      \"pmids\": [\"23638761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In Drosophila, overexpression of fly Nrx-I (NRXN1 ortholog) can reorganize synaptic morphology, induce increased density of active zones, and determine the level of the presynaptic active-zone protein bruchpilot, indicating a role in presynaptic active zone organization.\",\n      \"method\": \"Drosophila overexpression and loss-of-function; synaptic morphology analysis; immunostaining for active zone protein bruchpilot\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function in Drosophila with defined molecular readout (bruchpilot levels), single lab\",\n      \"pmids\": [\"19896112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NRXN1 heterozygous deletions in both isogenic and schizophrenia patient backgrounds impact molecular pathways associated with ubiquitin-proteasome system, alternative splicing, and synaptic signaling in maturing glutamatergic and GABAergic neurons in human brain organoids. SCZ-NRXN1 deletions specifically perturbed developmental trajectories of early neural progenitors. Both deletion backgrounds led to long-lasting changes in spontaneous and synchronous neuronal networks as measured by calcium imaging.\",\n      \"method\": \"Human pluripotent stem cell-derived forebrain organoids; single-cell transcriptomics; calcium imaging of neuronal networks\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isogenic and patient background comparisons, single-cell transcriptomics plus calcium imaging, single lab\",\n      \"pmids\": [\"37355690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Cells with bi-allelic NRXN1-alpha deletion show skewed fate toward radial glia-like cell identity, higher proportion of astroglia differentiation, and neurons with significantly depressed calcium signaling activity and impaired maturation action potential profiles compared to controls.\",\n      \"method\": \"Human iPSC-derived neural stem cells from ASD patient with bi-allelic NRXN1-alpha deletion; single-cell RNA-seq; calcium imaging; electrophysiology\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (scRNA-seq, calcium imaging, electrophysiology) on patient-derived cells, single lab\",\n      \"pmids\": [\"31302032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NRXN1 deletion increases astrocyte differentiation in human neuroepithelial stem cells via Notch pathway dysregulation. Treatment with the Notch inhibitor DAPT reversed the altered differentiation, placing NRXN1 upstream of Notch-dependent gliogenesis.\",\n      \"method\": \"Human neuroepithelial stem cells from ASD patient with bi-allelic NRXN1 deletion; GFAP immunofluorescence; DAPT Notch inhibitor rescue experiment\",\n      \"journal\": \"Frontiers in genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function in patient-derived cells with pharmacological rescue defining Notch pathway epistasis, single lab\",\n      \"pmids\": [\"31316548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NRXN1 overexpression and knockdown in vivo in rats affected learning and memory, and altered expression of synapse-related genes PSD95, SYN1, GAP43, and NLGN1. NRXN1 expression changes in primary hippocampal neurons in vitro also modulated synapse-related gene expression, supporting a role for NRXN1 in maintaining synaptic plasticity.\",\n      \"method\": \"In vivo NRXN1 overexpression and shRNA knockdown in rat hippocampus; Morris water maze; western blot/qPCR for synapse genes; primary hippocampal neuron in vitro experiments\",\n      \"journal\": \"Experimental neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and in vitro gain/loss-of-function with behavioral and molecular readouts, single lab\",\n      \"pmids\": [\"34228999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NRXN1 downregulation in the medial prefrontal cortex of rats induced anxiety-like behaviors, abnormal social phenotypes, and impaired neurite outgrowth. Proteomic analysis revealed alterations in pathways related to extracellular matrix, cell membrane, and morphologic change.\",\n      \"method\": \"In vivo shRNA knockdown of NRXN1 in rat medial PFC; behavioral tests; TMT-based proteomics; immunoblotting\",\n      \"journal\": \"Journal of neurodevelopmental disorders\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — region-specific in vivo knockdown with behavioral and proteomic readouts, single lab\",\n      \"pmids\": [\"36737720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NRXN1 mediates thalamic axon contact with primate-enriched outer radial glia in cortical-thalamic assembloids. Genetic perturbation of NRXN1 in thalamic neurons reduced these contacts and attenuated cortical upper-layer neurogenesis, revealing a role for NRXN1 in thalamus-to-cortex signaling during development.\",\n      \"method\": \"Cortical-thalamic organoid fusion (assembloid) model; single-nuclei RNA-sequencing; cellular imaging; NRXN1 genetic perturbation in thalamic neurons; quantification of outer radial glia contacts and upper-layer neurogenesis\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, single lab, novel assembloid system with genetic perturbation but limited replication\",\n      \"pmids\": [\"bio_10.1101_2025.04.25.650717\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ASD-associated NRXN1 deletions selectively enhance excitatory synaptic signaling without affecting inhibitory synapses, whereas SCZ-associated NRXN1 deletions reduce both excitatory and inhibitory synaptic transmission. ASD deletions also impair homeostatic synaptic plasticity (synaptic scaling) and generate irregular firing patterns at the network level.\",\n      \"method\": \"iPSC-derived cortical neurons from ASD and SCZ patients with NRXN1 deletions; whole-cell patch clamp electrophysiology; multi-electrode array network analysis; synaptic scaling assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal electrophysiological methods comparing ASD vs. SCZ patient-derived neurons, single lab\",\n      \"pmids\": [\"41865373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NRXN1 forms a transsynaptic complex with CBLN1 and GluD1 (NRXN1-CBLN1-GluD1) at VMHvl-to-arcuate AgRP/NPY neuron excitatory synapses. UBE3A impairs this synapse by decreasing Cbln1 gene expression, and heterozygous deficiency of presynaptic Nrxn1 synergizes with increased UBE3A to increase aggression.\",\n      \"method\": \"Mouse genetic models; targeted deletion experiments; chemogenetic/optogenetic circuit manipulation; behavioral aggression assays; epistasis between Ube3a, Nrxn1, and Grid1\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, circuit-level genetic epistasis with behavioral readout, single lab, complex multi-gene interactions\",\n      \"pmids\": [\"36909588\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Schizophrenia-associated 3' deletion NRXN1 isoforms can produce gain-of-function behavioral phenotypes in C. elegans more severe than the nrx-1 null mutant, demonstrating that patient-derived 3' deletion variants are actively pathogenic rather than simply loss-of-function. Several isoforms also displayed aberrant accumulation in neuronal cell bodies.\",\n      \"method\": \"Expression of 8 human NRXN1 isoform variants (including 4 patient-derived 3' deletion variants) in C. elegans neurons; behavioral assays (food deprivation response, social feeding); protein localization imaging\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, single lab, C. elegans heterologous expression system, but direct isoform comparison with defined behavioral readouts\",\n      \"pmids\": [\"bio_10.1101_2025.08.29.672776\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NRXN1 undergoes cell-type-specific alternative splicing in human brain, with distinct isoform repertoires in interneuron subtypes, pyramidal neurons, and glial lineages. NRXN1 isoform profiles are established during early development and remain stable during neuronal maturation. In schizophrenia patient-derived organoids with NRXN1 deletions, antisense oligonucleotide targeting of mutant splice junctions reduces gain-of-function NRXN1 isoforms in a cell-type-specific manner.\",\n      \"method\": \"Single-cell transcriptomics combined with targeted NRXN1 transcript enrichment and long-read sequencing; hiPSC cortical organoids; ASO treatment with isoform quantification\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, novel integrative sequencing approach, single lab; ASO functional experiment is initial proof-of-concept\",\n      \"pmids\": [\"bio_10.1101_2025.11.11.687875\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NRXN1 knockdown in human neural stem cells during differentiation altered expression of cell adhesion pathway genes and neuron differentiation pathway genes. Half reduction of NRXN1 expression resulted in time-dependent reduction of astrocyte marker GFAP, reproduced in both hiPSCs and hESCs.\",\n      \"method\": \"shRNAmir-based NRXN1 knockdown in hiPSC- and hESC-derived neural stem cells; RNA-Seq transcriptome profiling; qPCR; immunostaining for GFAP\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — controlled knockdown with transcriptome-wide readout, replicated in two stem cell models, single lab\",\n      \"pmids\": [\"23536886\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NRXN1 encodes a presynaptic cell-adhesion molecule that binds postsynaptic partners including neuroligins (NLGN1, NLGN2) and LRRTMs to organize trans-synaptic complexes; heterozygous loss of NRXN1 selectively impairs neurotransmitter release in human neurons (a human-specific phenotype not observed in mouse neurons), increases CASK scaffolding protein levels, and—depending on deletion context—either reduces (SCZ) or enhances (ASD) excitatory synaptic transmission while also impairing homeostatic synaptic plasticity; NRXN1 additionally mediates thalamic axon contact with outer radial glia to promote cortical upper-layer neurogenesis, regulates synaptic-gene expression networks (PSD95, SYN1, NLGN1) that support synaptic plasticity and learning, and forms part of a NRXN1-CBLN1-GluD1 transsynaptic complex at specific hypothalamic synapses; its extensive alternative splicing generates cell-type-specific isoform repertoires established early in development, and 3' deletion isoforms found in schizophrenia patients can act as gain-of-function pathogenic variants.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NRXN1 encodes a presynaptic cell-adhesion molecule that organizes trans-synaptic complexes and controls neurotransmitter release [#0, #1]. Through its LNS domains it binds postsynaptic partners including neuroligins (NLGN1, NLGN2) and LRRTM2, and truncating or missense variants that disrupt these interactions or reduce cell-surface expression fail to promote synaptic differentiation [#2, #3]. In human neurons, heterozygous NRXN1 loss selectively impairs neurotransmitter release and reproducibly elevates the scaffolding protein CASK, a phenotype not recapitulated in mouse neurons and therefore human-specific [#0, #1]. The functional consequences of NRXN1 disruption are deletion-context dependent: ASD-associated deletions enhance excitatory transmission and impair homeostatic synaptic scaling, whereas SCZ-associated deletions reduce both excitatory and inhibitory transmission [#13]. Beyond synaptic adhesion, NRXN1 acts during neurodevelopment, where its loss skews neural progenitor fate toward astroglia through Notch pathway dysregulation [#8, #9] and where it mediates thalamic axon contact to support cortical upper-layer neurogenesis [#12]. NRXN1 expression levels also tune networks of synapse-related genes (PSD95, SYN1, NLGN1) that underlie learning and memory [#10]. Functional conservation is demonstrated by rescue of C. elegans nrx-1 behavioral deficits with human NRXN1 isoforms [#4, #5], and schizophrenia-associated 3' deletion isoforms behave as gain-of-function pathogenic variants rather than simple loss-of-function [#15].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Establishing that neurexin function is evolutionarily conserved and acts in neurotransmitter signaling, by testing whether the invertebrate ortholog phenotype could be rescued by the human gene.\",\n      \"evidence\": \"C. elegans nrx-1 loss-of-function mutants with behavioral/pharmacological assays and transgenic rescue using human NRXN1 isoforms; Drosophila gain/loss-of-function with active-zone readouts\",\n      \"pmids\": [\"20010541\", \"19896112\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not define mammalian molecular partners\", \"Behavioral readouts do not localize the molecular defect to specific synapses\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Linking disease-associated truncating mutations to a molecular mechanism by showing they abolish binding to postsynaptic partners and synaptogenic activity.\",\n      \"evidence\": \"Neuron coculture synaptic differentiation assay and cell binding assays for LRRTM2 and NLGN2\",\n      \"pmids\": [\"21424692\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Did not test electrophysiological consequences in human neurons\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Revealing a developmental role beyond synapse adhesion, that NRXN1 dosage influences neural stem cell differentiation and gliogenesis.\",\n      \"evidence\": \"shRNAmir knockdown in hiPSC- and hESC-derived neural stem cells with RNA-Seq and GFAP immunostaining; functional conservation rescue in C. elegans\",\n      \"pmids\": [\"23536886\", \"23638761\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking NRXN1 to differentiation genes not defined\", \"Did not connect to synaptic phenotype\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Isolating the core human synaptic phenotype, that heterozygous NRXN1 loss selectively impairs neurotransmitter release without altering differentiation or synapse number, and elevates CASK.\",\n      \"evidence\": \"Human ESC-derived isogenic conditional heterozygous deletion neurons with electrophysiology and CASK western blot\",\n      \"pmids\": [\"26279266\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal role of elevated CASK in the release defect not established\", \"Single genetic background at this stage\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defining the developmental pathway through which NRXN1 controls cell fate, placing it upstream of Notch-dependent gliogenesis.\",\n      \"evidence\": \"Patient-derived bi-allelic NRXN1-alpha deletion neural stem cells with scRNA-seq, calcium imaging, electrophysiology, and DAPT Notch-inhibitor rescue\",\n      \"pmids\": [\"31302032\", \"31316548\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular link between NRXN1 and Notch signaling unresolved\", \"Bi-allelic deletion not directly comparable to heterozygous disease state\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Confirming the human-specificity and robustness of the release phenotype across labs and backgrounds, and dissecting how ASD versus SCZ deletions diverge functionally.\",\n      \"evidence\": \"Multicenter patient-derived and engineered iPSC neurons with electrophysiology, CASK western blot, MEA network analysis, and synaptic scaling assays; parallel Nrxn1-deficient mouse neurons\",\n      \"pmids\": [\"34035170\", \"41865373\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of the human-versus-mouse difference unknown\", \"Why ASD and SCZ deletions produce opposite excitatory effects not mechanistically resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connecting NRXN1 dosage to synaptic gene networks and behavior in an intact mammalian system.\",\n      \"evidence\": \"In vivo NRXN1 overexpression and shRNA knockdown in rat hippocampus and PFC, Morris water maze and social/anxiety behavioral tests, western blot/qPCR for synapse genes, and TMT proteomics\",\n      \"pmids\": [\"34228999\", \"36737720\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect regulation of synapse genes not distinguished\", \"Single lab in vivo perturbations\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showing NRXN1 deletions perturb proteostasis, splicing, and developmental trajectories in maturing human neural tissue.\",\n      \"evidence\": \"hPSC-derived forebrain organoids in isogenic and SCZ backgrounds with single-cell transcriptomics and calcium imaging\",\n      \"pmids\": [\"37355690\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal hierarchy among UPS, splicing, and synaptic changes unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extending NRXN1 function to a defined neural circuit and a specific transsynaptic complex.\",\n      \"evidence\": \"Mouse genetic, chemogenetic/optogenetic, and behavioral epistasis experiments defining a NRXN1-CBLN1-GluD1 complex at VMHvl-to-AgRP/NPY synapses (preprint)\",\n      \"pmids\": [\"36909588\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Preprint, single lab\", \"Complex architecture not biochemically reconstituted\", \"Generalizability to other synapses untested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identifying a developmental neurogenesis role in which NRXN1 mediates thalamic axon contact with outer radial glia.\",\n      \"evidence\": \"Cortical-thalamic assembloid model with single-nuclei RNA-seq, imaging, and NRXN1 genetic perturbation in thalamic neurons (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.04.25.650717\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Preprint, novel system with limited replication\", \"Postsynaptic/glial receptor mediating the contact not identified\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Reframing schizophrenia 3' deletion variants as actively pathogenic gain-of-function isoforms rather than simple loss-of-function, and providing cell-type-resolved isoform maps with an ASO correction strategy.\",\n      \"evidence\": \"Expression of patient-derived 3' deletion isoforms in C. elegans with behavioral and localization readouts; single-cell long-read transcriptomics and ASO targeting in hiPSC organoids (preprints)\",\n      \"pmids\": [\"bio_10.1101_2025.08.29.672776\", \"bio_10.1101_2025.11.11.687875\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Preprints, single labs\", \"Gain-of-function mechanism of 3' deletion isoforms not defined biochemically\", \"ASO rescue is proof-of-concept only\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how elevated CASK mechanistically causes impaired neurotransmitter release and why this phenotype is human-specific.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No causal demonstration that CASK accumulation drives the release deficit\", \"Molecular determinant of the human-versus-mouse divergence unidentified\", \"Structural basis for context-dependent ASD/SCZ phenotypic divergence unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 2, 3]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 1, 13]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [8, 9, 12]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [2, 14]}\n    ],\n    \"complexes\": [\n      \"NRXN1-CBLN1-GluD1 transsynaptic complex\"\n    ],\n    \"partners\": [\n      \"NLGN1\",\n      \"NLGN2\",\n      \"LRRTM2\",\n      \"CASK\",\n      \"CBLN1\",\n      \"GluD1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}