{"gene":"NLGN2","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2017,"finding":"MDGA1 Ig1-Ig2 binds NLGN2 with nanomolar affinity; crystal structures show two MDGA1 Ig1-Ig2 molecules each spanning the entire NLGN2 dimer, with Ig1 binding the same region on NLGN2 as neurexins do, thereby sterically blocking neurexin access to NLGN2 and regulating trans-synaptic bridge formation.","method":"Crystal structure determination, site-directed mutagenesis, binding affinity measurements","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure of NLGN2-MDGA1 complex plus mutagenesis confirming interaction interface, single rigorous study with multiple orthogonal methods","pmids":["28641112"],"is_preprint":false},{"year":2011,"finding":"The NLGN2 R215H missense mutation causes retention of the protein in the endoplasmic reticulum and prevents transport to the cell membrane, resulting in loss-of-function for GABAergic synaptogenesis as measured by immunocytochemistry and electrophysiological recordings.","method":"Immunocytochemistry, electrophysiological recordings, in vitro cell-based functional assay","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct cellular assays with two orthogonal methods (ICC + electrophysiology) in a single lab","pmids":["21551456"],"is_preprint":false},{"year":2011,"finding":"Truncating mutations in NRXN2 fail to bind NLGN2 in cell binding assays, establishing that the NRXN2-NLGN2 interaction is required for synaptic differentiation in neuron coculture.","method":"Cell binding assay, neuron coculture synaptogenesis assay","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct binding and functional assay but single lab, single study","pmids":["21424692"],"is_preprint":false},{"year":2016,"finding":"The extracellular domain of NLGN2 confers inhibitory synapse specificity, while the cytoplasmic tail is indispensable for function; two intracellular domains were identified: one gephyrin-dependent (disrupted by autism-associated R705 mutation) and one gephyrin-independent (reliant on putative phosphorylation site S714).","method":"Chimeric construct expression, electrophysiology in rat CA1 hippocampal neurons, site-directed mutagenesis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — systematic structure-function analysis with multiple chimeras and mutagenesis validated by electrophysiology","pmids":["27805570"],"is_preprint":false},{"year":2019,"finding":"NLGN2 is recycled from endosomes back to the plasma membrane via direct interaction between the PDZ domain of SNX27 and the PDZ-binding motif of NLGN2; SNX27-mediated recycling enhances synaptic NLGN2 clusters and affects inhibitory synapse composition and GABAergic signaling strength.","method":"Co-localization, co-immunoprecipitation, knockdown experiments, electrophysiology","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal interaction demonstrated, functional consequence confirmed by both KD and OE with electrophysiological readout","pmids":["31775031"],"is_preprint":false},{"year":2018,"finding":"FMRP associates with Nlgn2 mRNA in synaptoneurosomes and neuronal cultures and represses its local synaptic translation; in Fmr1 KO mice, elevated NLGN2 translation occurs. Additionally, NLGN2 undergoes rapid proteolytic cleavage upon NMDA receptor stimulation in both wild-type and Fmr1 KO mice.","method":"RNA immunoprecipitation, synaptoneurosomes fractionation, NMDA stimulation assays, western blot","journal":"Molecular neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct RNA-IP and functional translation assays with two orthogonal approaches in a single lab","pmids":["30056576"],"is_preprint":false},{"year":2016,"finding":"NLGN3 function at inhibitory synapses depends on the presence of NLGN2, and a domain in the extracellular region of NLGN2 accounts for the functional difference between NLGN2 and NLGN3 at inhibitory synapses.","method":"Chimeric construct expression, electrophysiology in rat hippocampal CA1 neurons","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — functional rescue experiments with domain swaps and electrophysiological validation; same study as R705/S714 findings","pmids":["27805570"],"is_preprint":false},{"year":2015,"finding":"Conditional knockout of Nlgn2 in adult medial prefrontal cortex causes major reductions in synaptic inhibition after 6-7 weeks and impairs anxiety, fear memory, and social interaction behaviors; Nlgn2 is required for continuous maintenance of inhibitory synapses in the adult mPFC.","method":"Conditional knockout mouse, electrophysiology, behavioral tests, immediate-early gene expression assay","journal":"Molecular psychiatry","confidence":"High","confidence_rationale":"Tier 2 / Strong — temporally and spatially controlled conditional KO with electrophysiological confirmation of synaptic deficit and multiple behavioral readouts","pmids":["25824299"],"is_preprint":false},{"year":2015,"finding":"Nlgn2 deletion predominantly affects inhibitory synapses at perisomatic sites in the basal amygdala, impairs inhibitory synaptic transmission, and leads to excessive activation of CaMKII-positive projection neurons (but not parvalbumin- or somatostatin-positive interneurons) under anxiogenic conditions.","method":"Knockout mouse, electrophysiology, immunohistochemistry, cFOS activation assay","journal":"Neuropharmacology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (electrophysiology, IHC, cFOS) in KO mice with defined cellular and circuit phenotypes","pmids":["26142252"],"is_preprint":false},{"year":2018,"finding":"Deletion of IgSF9b normalizes anxiety-related behaviors and neural processing in Nlgn2 KO mice through differential effects at inhibitory synapses in basal versus centromedial amygdala, placing IgSF9b downstream of or parallel to Nlgn2 in amygdala inhibitory circuit regulation.","method":"Double knockout mouse, electrophysiology, behavioral tests, local region-specific viral KO","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with double KO plus regional rescue experiments and electrophysiology","pmids":["30573727"],"is_preprint":false},{"year":2016,"finding":"NLGN2 in the midbrain forms Ca2+-independent complexes with serotonin transporter (SERT) in somatodendritic compartments of raphe neurons, co-localizing with α-neurexin and gephyrin; loss of NLGN2 reduces midbrain SERT expression and function, reduces GABAergic IPSCs onto dorsal raphe 5-HT neurons, and increases 5-HT1A autoreceptor sensitivity.","method":"Reciprocal co-immunoprecipitation, in situ hybridization, immunocytochemistry, electrophysiology in Nlgn2 null mice","journal":"Frontiers in synaptic neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP plus multiple orthogonal methods (ISH, ICC, electrophysiology) in KO mice","pmids":["26793096"],"is_preprint":false},{"year":2019,"finding":"NLGN2 overexpression rescues synaptic puncta deficits in schizophrenia iPSC-derived cortical interneurons, while NLGN2 knockdown in healthy neurons reduces synaptic puncta density, demonstrating that NLGN2 levels directly regulate inhibitory synapse number in human cortical interneurons.","method":"iPSC-derived neurons, NLGN2 overexpression/knockdown, synaptic puncta quantification","journal":"Translational psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional manipulation (OE and KD) in human-derived neurons with defined structural readout, single lab","pmids":["31780643"],"is_preprint":false},{"year":2018,"finding":"Nlgn2 R215H knock-in mice express no detectable NL2 protein, show reduced GABAergic transmission, and display anxiety-like behavior, impaired prepulse inhibition, cognitive deficits, and abnormal stress responses, demonstrating that this single point mutation causes GABAergic synaptic and behavioral pathology in vivo.","method":"Knock-in mouse model, electrophysiology, behavioral battery","journal":"Molecular brain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KI model with electrophysiology plus behavioral phenotyping, single lab","pmids":["29859117"],"is_preprint":false},{"year":2014,"finding":"Dystroglycan (αDAG) binds both LNS2 and LNS6 domains of Nrxn1α, and its binding at LNS2 sterically prevents NLGN2 interaction at LNS6, establishing that αDAG and NLGN2 compete for binding to α-neurexin at inhibitory synapses.","method":"Site-directed mutagenesis, binding assays, glycan analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — direct mutagenesis and binding assays but single lab, single study","pmids":["25157101"],"is_preprint":false},{"year":2018,"finding":"AAV-mediated overexpression of NLGN2 in mouse hippocampus increases gephyrin and GABAARγ2 membrane localization and VGAT presynaptic protein levels (trans-synaptic enhancement), increases parvalbumin-positive synaptic boutons, and causes cognitive impairments in hippocampus-dependent tasks without altering glutamatergic markers.","method":"AAV overexpression, immunohistochemistry, behavioral tests","journal":"Behavioural brain research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct gain-of-function in vivo with synaptic protein quantification and behavioral readout, single lab","pmids":["30605713"],"is_preprint":false},{"year":2013,"finding":"Intra-hippocampal administration of neurolide-2 (a synthetic peptide interfering with NLGN2-neurexin interaction) reduces sociability and increases aggression in rats, mimicking the social behavioral effects of chronic restraint stress that also reduces hippocampal NLGN2 protein levels.","method":"Intra-hippocampal peptide injection, western blot, immunohistochemistry, electron microscopy, behavioral tests","journal":"Neuropsychopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological disruption of NLGN2-neurexin interaction with behavioral readout and protein quantification, single lab","pmids":["24213355"],"is_preprint":false},{"year":2013,"finding":"AAV-mediated overexpression of NLGN2 in rat dorsal hippocampus increases GAD65 expression, reduces exploratory behavior toward novel stimuli, and decreases offensive aggression, indicating that hippocampal NLGN2 modulates the excitation/inhibition balance and social/emotional behavior.","method":"AAV overexpression in rat hippocampus, GAD65 immunohistochemistry, behavioral tests","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vivo gain-of-function with molecular and behavioral readouts, single lab","pmids":["23451101"],"is_preprint":false},{"year":2024,"finding":"NLGN2-neurexin adhesion is required for inhibitory long-term potentiation (iLTP) consolidation in hippocampal CA1 pyramidal cells; disruption with neurolide-2 blocks gephyrin clustering and NLGN2 recruitment to GABAergic synapses during NMDA-induced iLTP, with a critical 10-min post-induction window, and NMDA-induced iLTP at both SST and PV inputs depends on NLGN2.","method":"Synthetic peptide (neurolide-2) application, whole-cell recordings in hippocampal slices, immunostaining, optogenetics","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal approaches (pharmacology, electrophysiology, immunostaining, optogenetics) in a single rigorous study defining a mechanistic role for NLGN2 in iLTP","pmids":["41802868"],"is_preprint":false},{"year":2025,"finding":"NLGN2's extracellular domain determines inhibitory synapse specificity (exchangeable with NLGN1 extracellular domain to redirect function), while its cytoplasmic gephyrin-binding motif is essential for NLGN2 function at inhibitory synapses but dispensable for NLGN1 function at excitatory synapses, revealing distinct intracellular mechanisms for the two neuroligins despite identical gephyrin-binding motif sequences.","method":"Chimeric construct functional rescue in neuroligin-deficient hippocampal neurons, electrophysiology","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — comprehensive structure-function analysis with chimeras and rescue electrophysiology; directly comparable to prior work, extending and clarifying mechanism","pmids":["39747663"],"is_preprint":false},{"year":2023,"finding":"MDGA1 designer mutants that alter the 3D conformation of the MDGA1 ectodomain (via strategic elbow mutations far from the MDGA1-NLGN2 interaction site) reduce cellular NLGN2 binding and NLGN2-mediated inhibitory presynaptic differentiation, even while leaving soluble ectodomain binding affinity intact, demonstrating that the global 3D conformation of MDGA1 is critical for regulating NLGN2 function.","method":"Crystal structure, site-directed mutagenesis, cell-based binding assays, inhibitory presynaptic differentiation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — structural basis combined with mutagenesis and functional cell-based assays, single rigorous study with multiple orthogonal methods","pmids":["36889589"],"is_preprint":false},{"year":2025,"finding":"In the lateral habenula, MDGA1 directly interacts with NLGN2 (interaction elevated by chronic restraint stress); loss of MDGA1 or introduction of an NLGN2 variant incapable of binding MDGA1 increases inhibitory synaptic transmission and GABAergic synapse density in the LHb, reduces stress-induced LHb hyperactivation, and confers resistance to depression-like behaviors.","method":"Conditional knockout mouse, knock-in mouse, electrophysiology, immunostaining, behavioral tests","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis via both KO and KI with electrophysiology and behavioral phenotyping across multiple complementary approaches","pmids":["39897557"],"is_preprint":false},{"year":2024,"finding":"Loss of MDGA1 (but not heterozygous MDGA2 deletion) ameliorates abnormal cytosolic gephyrin aggregation, reduced inhibitory synaptic transmission, and exacerbated anxiety in Nlgn2 KO mice; combined Nlgn2 and MDGA1 deletion causes exacerbated layer-specific loss of gephyrin puncta, establishing MDGA1 as a functional modulator of NLGN2 in recruiting GABAergic postsynaptic gephyrin scaffold.","method":"Double knockout mouse, electrophysiology, immunohistochemistry, behavioral tests","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with double KO and multiple orthogonal readouts (electrophysiology, IHC, behavior) in a single study","pmids":["39284869"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structures of human NLGN2 and NLGN3 homodimers reveal relative rotations of the two protomers between isoforms, suggesting that distinct dimer assemblies may underlie differential interactions with MDGA regulators.","method":"Cryo-electron microscopy structure determination, structural comparison","journal":"Frontiers in endocrinology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — cryo-EM structures determined but functional validation of the structural difference is speculative in the abstract; single study","pmids":["36479216"],"is_preprint":false},{"year":2020,"finding":"PSD-95 deficiency promotes inhibitory synapse function through upregulation and trafficking of NLGN2, placing NLGN2 downstream of PSD-95 in a pathway linking excitatory scaffold disruption to compensatory GABAergic inhibition.","method":"PSD-95 heterozygous transgenic mice, electrophysiology, western blot, protein trafficking assay","journal":"Neuropharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO model with electrophysiology and protein level assays showing NLGN2 upregulation and trafficking change; single lab","pmids":["32818520"],"is_preprint":false},{"year":2024,"finding":"Nlgn2 synaptogenic activity at GABAergic synapses requires CaMKII and Src kinase signaling (in addition to JNK), whereas IgSF21-mediated GABAergic synaptogenesis requires only JNK, establishing a distinct intracellular signaling requirement for NLGN2-mediated inhibitory presynaptic differentiation.","method":"Pharmacological inhibition of kinase pathways, synaptogenesis assay in cultured neurons","journal":"Frontiers in molecular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological dissection of signaling requirements with defined cellular assay, single lab","pmids":["38571813"],"is_preprint":false},{"year":2024,"finding":"In pancreatic acinar cells, NLGN2 localizes to tight junctions and is required for formation of the PALS1/PATJ polarity complex, which reduces YAP activity to maintain contact inhibition; NLGN2 is lost progressively from low- to high-grade pancreatic intraepithelial neoplasias.","method":"Immunolocalization, KO/knockdown experiments, PALS1/PATJ complex assessment, YAP activity assay","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined molecular pathway (PALS1/PATJ-YAP axis) and direct localization data, single lab","pmids":["38413734"],"is_preprint":false},{"year":2018,"finding":"NLGN2 silencing in endothelial cells strongly reduces Angiopoietin 2 (Ang2) release upon VEGF stimulation and increases retention of Weibel-Palade bodies; NLGN2 overexpression depletes Weibel-Palade bodies; NLGN2 null mice show immature vasculature with lower pericyte coverage and reduced Tie2 phosphorylation; NLGN2 co-localizes with collybistin in endothelial cells.","method":"siRNA knockdown, NLGN2 overexpression, in vitro Ang2 secretion assay, NLGN2 null mouse in vivo vascular analysis, immunolocalization","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional manipulation in vitro with in vivo confirmation in KO mice; single lab","pmids":["29709479"],"is_preprint":false},{"year":2019,"finding":"HIV-1 Tat exposure of astrocytes induces release of extracellular vesicles containing miR-7, which is taken up by neurons and downregulates neuronal NLGN2, leading to synaptic alterations that are reversed by PDGF-CC pretreatment.","method":"Astrocyte culture, extracellular vesicle isolation, miR-7 quantification, neuronal NLGN2 measurement, synaptic assay","journal":"Journal of neuroimmune pharmacology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — indirect mechanism involving EV-miRNA with NLGN2 as downstream target; single lab, no direct NLGN2 rescue experiment described in abstract","pmids":["31401755"],"is_preprint":false},{"year":2026,"finding":"Mass photometry revealed that recombinant human NLGN2 extracellular domain exists in a concentration-dependent monomer-dimer equilibrium at nanomolar concentrations, with NLGN2 showing intermediate homodimerization affinity compared to NLGN3 (highest) and NLGN1 (lowest), indicating isoform-specific dimer interface properties.","method":"Mass photometry, size exclusion chromatography-MALS","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — direct biophysical measurement of dimerization equilibrium with orthogonal method (SEC-MALS) but single lab, no functional validation of the monomer-dimer distinction","pmids":["42033941"],"is_preprint":false},{"year":2025,"finding":"Beta-Nrxn1 (but not alpha-Nrxn1) can be recruited to synaptic contacts by both GABAergic NLGN2 and glutamatergic NLGN1 in transcellular assays; insertion of alternative spliced segment 4 (AS4) negatively modulates presynaptic recruitment of Nrxn1 by neuroligins; an autism-associated mutant beta-Nrxn1 shows ligand restriction to glutamatergic NLGN1, losing interaction with NLGN2.","method":"Transcellular synaptic recruitment assay, neurexin isoform analysis in autism mouse model","journal":"Molecular brain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct transcellular functional assay plus in vivo mouse model validation; single lab","pmids":["40087687"],"is_preprint":false},{"year":2018,"finding":"Nlgn2 deletion in adult medial prefrontal cortex or knockdown selectively in dopamine D1-positive cells in nucleus accumbens promotes stress susceptibility, while knockdown in D2-positive cells mediates active defensive behavior, establishing cell-type-specific roles for NLGN2 in NAc circuits underlying depression and stress.","method":"Cell-type-specific viral knockdown, chronic social defeat stress, behavioral tests","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific loss-of-function with defined behavioral readouts; single lab","pmids":["29339486"],"is_preprint":false}],"current_model":"NLGN2 is a postsynaptic cell-adhesion molecule that functions exclusively at GABAergic inhibitory synapses by forming trans-synaptic bridges with presynaptic neurexins (primarily beta-Nrxn1 and alpha-Nrxn1); its extracellular domain confers inhibitory synapse specificity while its intracellular domain recruits gephyrin and stabilizes GABAA receptors through both gephyrin-dependent (R705) and gephyrin-independent (S714 phosphorylation) mechanisms; it undergoes SNX27-mediated endosomal recycling to maintain synaptic surface levels, is subject to FMRP-dependent local translation and NMDA-induced proteolytic cleavage, is regulated in cis by MDGA1 (which sterically occludes neurexin binding), and is required for inhibitory LTP consolidation in hippocampal CA1; loss of NLGN2 impairs inhibitory synaptic transmission in amygdala, prefrontal cortex, hippocampus, and lateral habenula, producing anxiety, cognitive, and social behavioral deficits, while non-neuronally it regulates Angiopoietin 2 secretion via endothelial Weibel-Palade bodies and epithelial contact inhibition via the PALS1/PATJ-YAP axis."},"narrative":{"mechanistic_narrative":"NLGN2 is a postsynaptic cell-adhesion molecule that organizes GABAergic inhibitory synapses by forming trans-synaptic bridges with presynaptic neurexins, and its abundance directly sets inhibitory synapse number and signaling strength [PMID:31780643, PMID:30605713]. Its extracellular domain confers inhibitory-synapse specificity while its cytoplasmic tail is indispensable for function, acting through two intracellular routes: a gephyrin-dependent arm (disrupted by the autism-associated R705 mutation) and a gephyrin-independent arm requiring the S714 phosphorylation site [PMID:27805570]; the gephyrin-binding motif is essential for NLGN2 but, despite identical sequence, dispensable for NLGN1 at excitatory synapses, indicating isoform-specific intracellular wiring [PMID:39747663]. The neurexin bridge is competitively and conformationally regulated in cis: MDGA1 Ig1-Ig2 spans the NLGN2 dimer and sterically blocks the neurexin-binding surface, with MDGA1's global ectodomain conformation determining its inhibitory effect [PMID:28641112, PMID:36889589], and α-dystroglycan competes with NLGN2 for α-neurexin [PMID:25157101]. Neurexin engagement itself is ligand-selective, with β-Nrxn1 recruited by NLGN2 and modulated by the AS4 splice insert [PMID:40087687]. Surface NLGN2 levels are maintained by SNX27-mediated endosomal recycling via a PDZ interaction, which tunes inhibitory synapse composition [PMID:31775031], and its expression is set by FMRP-dependent repression of local translation together with NMDA-induced proteolytic cleavage [PMID:30056576]. Functionally, NLGN2-neurexin adhesion drives gephyrin clustering required for inhibitory LTP consolidation in CA1 [PMID:41802868], and loss of NLGN2 reduces inhibitory transmission across prefrontal cortex, amygdala, raphe, and other circuits, producing anxiety, cognitive, social, and stress-related behavioral deficits [PMID:25824299, PMID:26142252, PMID:29339486]; the R215H mutation abolishes protein expression and recapitulates GABAergic and behavioral pathology in vivo [PMID:21551456, PMID:29859117]. Beyond neurons, NLGN2 controls Angiopoietin-2 secretion from endothelial Weibel-Palade bodies [PMID:29709479] and supports epithelial contact inhibition through assembly of the PALS1/PATJ polarity complex that restrains YAP [PMID:38413734].","teleology":[{"year":2011,"claim":"Established that a specific missense mutation disrupts NLGN2 trafficking and that the NRXN2-NLGN2 interaction is required for synaptic differentiation, linking molecular adhesion to GABAergic synaptogenesis.","evidence":"R215H ER-retention assay by ICC/electrophysiology, and NRXN2 truncation binding/coculture assays","pmids":["21551456","21424692"],"confidence":"Medium","gaps":["Did not resolve the in vivo behavioral consequence of trafficking loss","Single-lab cell-based assays without structural detail of the binding interface"]},{"year":2013,"claim":"Showed that bidirectionally manipulating hippocampal NLGN2 shifts excitation/inhibition balance and social/emotional behavior, connecting synaptic adhesion to circuit-level behavior.","evidence":"AAV overexpression and neurolide-2 peptide disruption in rat hippocampus with GAD65/protein quantification and behavioral tests","pmids":["23451101","24213355"],"confidence":"Medium","gaps":["Peptide and overexpression effects are correlative for endogenous synapse dynamics","Circuit specificity not dissected"]},{"year":2014,"claim":"Identified α-dystroglycan as a competitor for α-neurexin binding, revealing that NLGN2's trans-synaptic bridge is regulated by competition at the neurexin surface.","evidence":"Site-directed mutagenesis and binding/glycan assays mapping LNS2/LNS6 binding","pmids":["25157101"],"confidence":"Medium","gaps":["Competition shown biochemically but not at native synapses","Functional consequence for inhibitory synapse density untested"]},{"year":2015,"claim":"Demonstrated that NLGN2 is continuously required to maintain inhibitory synapses in adult brain, establishing an ongoing rather than purely developmental role.","evidence":"Adult conditional/regional Nlgn2 KO in mPFC and amygdala with electrophysiology, IHC, cFOS, and behavior","pmids":["25824299","26142252"],"confidence":"High","gaps":["Did not identify the maintenance signaling pathway","Cell-type specificity within each region only partially resolved"]},{"year":2016,"claim":"Dissected the extracellular versus intracellular contributions, defining inhibitory-synapse specificity in the ectodomain and two separable cytoplasmic arms (gephyrin-dependent R705, gephyrin-independent S714).","evidence":"Chimeric construct rescue and mutagenesis with CA1 electrophysiology; also showed NLGN3 depends on NLGN2","pmids":["27805570"],"confidence":"High","gaps":["S714 phosphorylation site is putative; the kinase and gephyrin-independent effector were not identified","Did not establish the SERT-NLGN2 complex stoichiometry described separately"]},{"year":2016,"claim":"Extended NLGN2 function beyond classic inhibitory synapses to somatodendritic complexes with the serotonin transporter, linking NLGN2 to serotonergic raphe physiology.","evidence":"Reciprocal Co-IP, ISH, ICC, and electrophysiology in Nlgn2 null mice","pmids":["26793096"],"confidence":"High","gaps":["Mechanism by which NLGN2 stabilizes SERT is undefined","Direct versus indirect nature of the SERT complex unresolved"]},{"year":2017,"claim":"Provided the structural basis for cis-regulation, showing MDGA1 sterically occludes the neurexin-binding region of the NLGN2 dimer.","evidence":"Crystal structure of MDGA1 Ig1-Ig2 bound to NLGN2 dimer with mutagenesis and affinity measurements","pmids":["28641112"],"confidence":"High","gaps":["Did not establish in vivo MDGA1 stoichiometry or regulation","Conformational requirements addressed only later"]},{"year":2018,"claim":"Identified post-transcriptional and post-translational control of NLGN2 levels through FMRP-repressed local translation and NMDA-triggered cleavage, and confirmed the R215H mutation causes loss of protein and pathology in vivo.","evidence":"RNA-IP/synaptoneurosome translation assays, NMDA cleavage western blots, and R215H knock-in mouse phenotyping","pmids":["30056576","29859117"],"confidence":"Medium","gaps":["Protease responsible for NMDA-induced cleavage not identified","Functional impact of cleavage on synapse stability not quantified"]},{"year":2018,"claim":"Placed NLGN2 within defined circuit and genetic frameworks, identifying IgSF9b as an epistatic modifier in amygdala and cell-type-specific NAc roles in stress behavior.","evidence":"Nlgn2/IgSF9b double KO and D1/D2 cell-type-specific viral knockdown with electrophysiology and behavior","pmids":["30573727","29339486"],"confidence":"High","gaps":["Molecular interaction between NLGN2 and IgSF9b not established","How cell-type identity dictates opposite behavioral outcomes unresolved"]},{"year":2018,"claim":"Revealed a non-neuronal endothelial role, where NLGN2 controls Angiopoietin-2 release from Weibel-Palade bodies and vascular maturation.","evidence":"siRNA/overexpression Ang2 secretion assays and Nlgn2 null vascular analysis with collybistin co-localization","pmids":["29709479"],"confidence":"Medium","gaps":["Mechanism coupling NLGN2 to Weibel-Palade body exocytosis unknown","Whether collybistin mediates the endothelial function untested"]},{"year":2019,"claim":"Established surface-level maintenance via SNX27-mediated endosomal recycling and showed NLGN2 dosage directly sets inhibitory synapse number in human neurons.","evidence":"Co-IP/knockdown of SNX27 with electrophysiology, and NLGN2 OE/KD in iPSC-derived interneurons with puncta quantification","pmids":["31775031","31780643"],"confidence":"High","gaps":["Signals triggering NLGN2 endocytosis versus recycling not defined","Link between recycling and activity-dependent plasticity untested"]},{"year":2019,"claim":"Identified an indirect regulatory route in which astrocyte-derived EV miR-7 downregulates neuronal NLGN2 under HIV-1 Tat exposure.","evidence":"Astrocyte EV isolation, miR-7 quantification, and neuronal NLGN2/synaptic measurement","pmids":["31401755"],"confidence":"Low","gaps":["No direct NLGN2 rescue experiment confirming causality","Single-lab, indirect mechanism with NLGN2 only as downstream target"]},{"year":2020,"claim":"Positioned NLGN2 in a compensatory homeostatic pathway whereby excitatory scaffold loss upregulates and traffics NLGN2 to strengthen inhibition.","evidence":"PSD-95 heterozygous mice with electrophysiology, western blot, and trafficking assays","pmids":["32818520"],"confidence":"Medium","gaps":["Signal coupling PSD-95 loss to NLGN2 trafficking not identified","Whether this is direct or circuit-mediated unresolved"]},{"year":2022,"claim":"Provided full-length dimer architecture, showing isoform-specific protomer rotations that could underlie differential MDGA regulation.","evidence":"Cryo-EM structures of human NLGN2 and NLGN3 homodimers with structural comparison","pmids":["36479216"],"confidence":"Medium","gaps":["Functional consequence of the rotational difference not validated","Link to MDGA selectivity remains structural inference"]},{"year":2023,"claim":"Showed that MDGA1's global 3D conformation, not just its interaction interface, governs its ability to suppress NLGN2-mediated presynaptic differentiation.","evidence":"Crystal structure plus elbow mutants with cell-based binding and presynaptic differentiation assays","pmids":["36889589"],"confidence":"High","gaps":["Physiological trigger that alters MDGA1 conformation unknown","In vivo relevance of conformational regulation untested"]},{"year":2024,"claim":"Defined NLGN2's mechanistic role in inhibitory plasticity and its distinct intracellular signaling requirements, and extended its biology to pancreatic epithelial polarity.","evidence":"Neurolide-2/optogenetics iLTP assays in CA1, kinase-inhibitor synaptogenesis assays, and pancreatic acinar KO with PALS1/PATJ-YAP readouts","pmids":["41802868","38571813","38413734"],"confidence":"High","gaps":["How CaMKII/Src/JNK signaling converges on NLGN2 synaptogenic output is unclear","Mechanism linking NLGN2 to PALS1/PATJ assembly at tight junctions undefined"]},{"year":2024,"claim":"Resolved MDGA1 as a genetic modifier of NLGN2 in vivo and clarified the divergence between NLGN2 and NLGN1 intracellular mechanisms despite shared gephyrin motifs.","evidence":"Nlgn2/MDGA1 double KO with electrophysiology/IHC/behavior; chimeric rescue in neuroligin-deficient neurons","pmids":["39284869","39747663"],"confidence":"High","gaps":["The effector distinguishing identical gephyrin motifs in NLGN1 versus NLGN2 not identified","Layer-specific gephyrin loss mechanism unresolved"]},{"year":2025,"claim":"Refined ligand selectivity and demonstrated a stress-regulated NLGN2-MDGA1 interaction in the lateral habenula controlling depression susceptibility.","evidence":"Transcellular neurexin recruitment assays with AS4 splice analysis; LHb conditional KO and NLGN2 binding-deficient knock-in with electrophysiology and behavior","pmids":["40087687","39897557"],"confidence":"Medium","gaps":["How chronic stress increases NLGN2-MDGA1 binding mechanistically is unknown","Whether AS4-modulated selectivity operates at native synapses untested"]},{"year":2026,"claim":"Quantified isoform-specific homodimerization, showing NLGN2 occupies an intermediate monomer-dimer equilibrium relative to NLGN1 and NLGN3.","evidence":"Mass photometry and SEC-MALS of recombinant NLGN2 ectodomain","pmids":["42033941"],"confidence":"Medium","gaps":["Functional consequence of the dimerization equilibrium not established","No link to in vivo synaptic clustering demonstrated"]},{"year":null,"claim":"The effectors that distinguish the identical NLGN1/NLGN2 gephyrin-binding motifs, the gephyrin-independent S714 pathway, and the protease and physiological control of NMDA-induced NLGN2 cleavage remain undefined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No kinase or downstream effector identified for the S714 gephyrin-independent arm","Protease mediating NLGN2 cleavage unknown","Mechanism converting shared gephyrin motif into isoform-specific function unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,2,3,29]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,4,25]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,4,14]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[3,7,17]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[0,2,29]}],"complexes":["gephyrin postsynaptic scaffold","PALS1/PATJ 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\"Crystal structure determination, site-directed mutagenesis, binding affinity measurements\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure of NLGN2-MDGA1 complex plus mutagenesis confirming interaction interface, single rigorous study with multiple orthogonal methods\",\n      \"pmids\": [\"28641112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The NLGN2 R215H missense mutation causes retention of the protein in the endoplasmic reticulum and prevents transport to the cell membrane, resulting in loss-of-function for GABAergic synaptogenesis as measured by immunocytochemistry and electrophysiological recordings.\",\n      \"method\": \"Immunocytochemistry, electrophysiological recordings, in vitro cell-based functional assay\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct cellular assays with two orthogonal methods (ICC + electrophysiology) in a single lab\",\n      \"pmids\": [\"21551456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Truncating mutations in NRXN2 fail to bind NLGN2 in cell binding assays, establishing that the NRXN2-NLGN2 interaction is required for synaptic differentiation in neuron coculture.\",\n      \"method\": \"Cell binding assay, neuron coculture synaptogenesis assay\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct binding and functional assay but single lab, single study\",\n      \"pmids\": [\"21424692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The extracellular domain of NLGN2 confers inhibitory synapse specificity, while the cytoplasmic tail is indispensable for function; two intracellular domains were identified: one gephyrin-dependent (disrupted by autism-associated R705 mutation) and one gephyrin-independent (reliant on putative phosphorylation site S714).\",\n      \"method\": \"Chimeric construct expression, electrophysiology in rat CA1 hippocampal neurons, site-directed mutagenesis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — systematic structure-function analysis with multiple chimeras and mutagenesis validated by electrophysiology\",\n      \"pmids\": [\"27805570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NLGN2 is recycled from endosomes back to the plasma membrane via direct interaction between the PDZ domain of SNX27 and the PDZ-binding motif of NLGN2; SNX27-mediated recycling enhances synaptic NLGN2 clusters and affects inhibitory synapse composition and GABAergic signaling strength.\",\n      \"method\": \"Co-localization, co-immunoprecipitation, knockdown experiments, electrophysiology\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal interaction demonstrated, functional consequence confirmed by both KD and OE with electrophysiological readout\",\n      \"pmids\": [\"31775031\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FMRP associates with Nlgn2 mRNA in synaptoneurosomes and neuronal cultures and represses its local synaptic translation; in Fmr1 KO mice, elevated NLGN2 translation occurs. Additionally, NLGN2 undergoes rapid proteolytic cleavage upon NMDA receptor stimulation in both wild-type and Fmr1 KO mice.\",\n      \"method\": \"RNA immunoprecipitation, synaptoneurosomes fractionation, NMDA stimulation assays, western blot\",\n      \"journal\": \"Molecular neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RNA-IP and functional translation assays with two orthogonal approaches in a single lab\",\n      \"pmids\": [\"30056576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NLGN3 function at inhibitory synapses depends on the presence of NLGN2, and a domain in the extracellular region of NLGN2 accounts for the functional difference between NLGN2 and NLGN3 at inhibitory synapses.\",\n      \"method\": \"Chimeric construct expression, electrophysiology in rat hippocampal CA1 neurons\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — functional rescue experiments with domain swaps and electrophysiological validation; same study as R705/S714 findings\",\n      \"pmids\": [\"27805570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Conditional knockout of Nlgn2 in adult medial prefrontal cortex causes major reductions in synaptic inhibition after 6-7 weeks and impairs anxiety, fear memory, and social interaction behaviors; Nlgn2 is required for continuous maintenance of inhibitory synapses in the adult mPFC.\",\n      \"method\": \"Conditional knockout mouse, electrophysiology, behavioral tests, immediate-early gene expression assay\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — temporally and spatially controlled conditional KO with electrophysiological confirmation of synaptic deficit and multiple behavioral readouts\",\n      \"pmids\": [\"25824299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Nlgn2 deletion predominantly affects inhibitory synapses at perisomatic sites in the basal amygdala, impairs inhibitory synaptic transmission, and leads to excessive activation of CaMKII-positive projection neurons (but not parvalbumin- or somatostatin-positive interneurons) under anxiogenic conditions.\",\n      \"method\": \"Knockout mouse, electrophysiology, immunohistochemistry, cFOS activation assay\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (electrophysiology, IHC, cFOS) in KO mice with defined cellular and circuit phenotypes\",\n      \"pmids\": [\"26142252\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Deletion of IgSF9b normalizes anxiety-related behaviors and neural processing in Nlgn2 KO mice through differential effects at inhibitory synapses in basal versus centromedial amygdala, placing IgSF9b downstream of or parallel to Nlgn2 in amygdala inhibitory circuit regulation.\",\n      \"method\": \"Double knockout mouse, electrophysiology, behavioral tests, local region-specific viral KO\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with double KO plus regional rescue experiments and electrophysiology\",\n      \"pmids\": [\"30573727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NLGN2 in the midbrain forms Ca2+-independent complexes with serotonin transporter (SERT) in somatodendritic compartments of raphe neurons, co-localizing with α-neurexin and gephyrin; loss of NLGN2 reduces midbrain SERT expression and function, reduces GABAergic IPSCs onto dorsal raphe 5-HT neurons, and increases 5-HT1A autoreceptor sensitivity.\",\n      \"method\": \"Reciprocal co-immunoprecipitation, in situ hybridization, immunocytochemistry, electrophysiology in Nlgn2 null mice\",\n      \"journal\": \"Frontiers in synaptic neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP plus multiple orthogonal methods (ISH, ICC, electrophysiology) in KO mice\",\n      \"pmids\": [\"26793096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NLGN2 overexpression rescues synaptic puncta deficits in schizophrenia iPSC-derived cortical interneurons, while NLGN2 knockdown in healthy neurons reduces synaptic puncta density, demonstrating that NLGN2 levels directly regulate inhibitory synapse number in human cortical interneurons.\",\n      \"method\": \"iPSC-derived neurons, NLGN2 overexpression/knockdown, synaptic puncta quantification\",\n      \"journal\": \"Translational psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional manipulation (OE and KD) in human-derived neurons with defined structural readout, single lab\",\n      \"pmids\": [\"31780643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Nlgn2 R215H knock-in mice express no detectable NL2 protein, show reduced GABAergic transmission, and display anxiety-like behavior, impaired prepulse inhibition, cognitive deficits, and abnormal stress responses, demonstrating that this single point mutation causes GABAergic synaptic and behavioral pathology in vivo.\",\n      \"method\": \"Knock-in mouse model, electrophysiology, behavioral battery\",\n      \"journal\": \"Molecular brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KI model with electrophysiology plus behavioral phenotyping, single lab\",\n      \"pmids\": [\"29859117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Dystroglycan (αDAG) binds both LNS2 and LNS6 domains of Nrxn1α, and its binding at LNS2 sterically prevents NLGN2 interaction at LNS6, establishing that αDAG and NLGN2 compete for binding to α-neurexin at inhibitory synapses.\",\n      \"method\": \"Site-directed mutagenesis, binding assays, glycan analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — direct mutagenesis and binding assays but single lab, single study\",\n      \"pmids\": [\"25157101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"AAV-mediated overexpression of NLGN2 in mouse hippocampus increases gephyrin and GABAARγ2 membrane localization and VGAT presynaptic protein levels (trans-synaptic enhancement), increases parvalbumin-positive synaptic boutons, and causes cognitive impairments in hippocampus-dependent tasks without altering glutamatergic markers.\",\n      \"method\": \"AAV overexpression, immunohistochemistry, behavioral tests\",\n      \"journal\": \"Behavioural brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct gain-of-function in vivo with synaptic protein quantification and behavioral readout, single lab\",\n      \"pmids\": [\"30605713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Intra-hippocampal administration of neurolide-2 (a synthetic peptide interfering with NLGN2-neurexin interaction) reduces sociability and increases aggression in rats, mimicking the social behavioral effects of chronic restraint stress that also reduces hippocampal NLGN2 protein levels.\",\n      \"method\": \"Intra-hippocampal peptide injection, western blot, immunohistochemistry, electron microscopy, behavioral tests\",\n      \"journal\": \"Neuropsychopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological disruption of NLGN2-neurexin interaction with behavioral readout and protein quantification, single lab\",\n      \"pmids\": [\"24213355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"AAV-mediated overexpression of NLGN2 in rat dorsal hippocampus increases GAD65 expression, reduces exploratory behavior toward novel stimuli, and decreases offensive aggression, indicating that hippocampal NLGN2 modulates the excitation/inhibition balance and social/emotional behavior.\",\n      \"method\": \"AAV overexpression in rat hippocampus, GAD65 immunohistochemistry, behavioral tests\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vivo gain-of-function with molecular and behavioral readouts, single lab\",\n      \"pmids\": [\"23451101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NLGN2-neurexin adhesion is required for inhibitory long-term potentiation (iLTP) consolidation in hippocampal CA1 pyramidal cells; disruption with neurolide-2 blocks gephyrin clustering and NLGN2 recruitment to GABAergic synapses during NMDA-induced iLTP, with a critical 10-min post-induction window, and NMDA-induced iLTP at both SST and PV inputs depends on NLGN2.\",\n      \"method\": \"Synthetic peptide (neurolide-2) application, whole-cell recordings in hippocampal slices, immunostaining, optogenetics\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal approaches (pharmacology, electrophysiology, immunostaining, optogenetics) in a single rigorous study defining a mechanistic role for NLGN2 in iLTP\",\n      \"pmids\": [\"41802868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NLGN2's extracellular domain determines inhibitory synapse specificity (exchangeable with NLGN1 extracellular domain to redirect function), while its cytoplasmic gephyrin-binding motif is essential for NLGN2 function at inhibitory synapses but dispensable for NLGN1 function at excitatory synapses, revealing distinct intracellular mechanisms for the two neuroligins despite identical gephyrin-binding motif sequences.\",\n      \"method\": \"Chimeric construct functional rescue in neuroligin-deficient hippocampal neurons, electrophysiology\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — comprehensive structure-function analysis with chimeras and rescue electrophysiology; directly comparable to prior work, extending and clarifying mechanism\",\n      \"pmids\": [\"39747663\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MDGA1 designer mutants that alter the 3D conformation of the MDGA1 ectodomain (via strategic elbow mutations far from the MDGA1-NLGN2 interaction site) reduce cellular NLGN2 binding and NLGN2-mediated inhibitory presynaptic differentiation, even while leaving soluble ectodomain binding affinity intact, demonstrating that the global 3D conformation of MDGA1 is critical for regulating NLGN2 function.\",\n      \"method\": \"Crystal structure, site-directed mutagenesis, cell-based binding assays, inhibitory presynaptic differentiation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — structural basis combined with mutagenesis and functional cell-based assays, single rigorous study with multiple orthogonal methods\",\n      \"pmids\": [\"36889589\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In the lateral habenula, MDGA1 directly interacts with NLGN2 (interaction elevated by chronic restraint stress); loss of MDGA1 or introduction of an NLGN2 variant incapable of binding MDGA1 increases inhibitory synaptic transmission and GABAergic synapse density in the LHb, reduces stress-induced LHb hyperactivation, and confers resistance to depression-like behaviors.\",\n      \"method\": \"Conditional knockout mouse, knock-in mouse, electrophysiology, immunostaining, behavioral tests\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis via both KO and KI with electrophysiology and behavioral phenotyping across multiple complementary approaches\",\n      \"pmids\": [\"39897557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Loss of MDGA1 (but not heterozygous MDGA2 deletion) ameliorates abnormal cytosolic gephyrin aggregation, reduced inhibitory synaptic transmission, and exacerbated anxiety in Nlgn2 KO mice; combined Nlgn2 and MDGA1 deletion causes exacerbated layer-specific loss of gephyrin puncta, establishing MDGA1 as a functional modulator of NLGN2 in recruiting GABAergic postsynaptic gephyrin scaffold.\",\n      \"method\": \"Double knockout mouse, electrophysiology, immunohistochemistry, behavioral tests\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with double KO and multiple orthogonal readouts (electrophysiology, IHC, behavior) in a single study\",\n      \"pmids\": [\"39284869\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structures of human NLGN2 and NLGN3 homodimers reveal relative rotations of the two protomers between isoforms, suggesting that distinct dimer assemblies may underlie differential interactions with MDGA regulators.\",\n      \"method\": \"Cryo-electron microscopy structure determination, structural comparison\",\n      \"journal\": \"Frontiers in endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — cryo-EM structures determined but functional validation of the structural difference is speculative in the abstract; single study\",\n      \"pmids\": [\"36479216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PSD-95 deficiency promotes inhibitory synapse function through upregulation and trafficking of NLGN2, placing NLGN2 downstream of PSD-95 in a pathway linking excitatory scaffold disruption to compensatory GABAergic inhibition.\",\n      \"method\": \"PSD-95 heterozygous transgenic mice, electrophysiology, western blot, protein trafficking assay\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO model with electrophysiology and protein level assays showing NLGN2 upregulation and trafficking change; single lab\",\n      \"pmids\": [\"32818520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Nlgn2 synaptogenic activity at GABAergic synapses requires CaMKII and Src kinase signaling (in addition to JNK), whereas IgSF21-mediated GABAergic synaptogenesis requires only JNK, establishing a distinct intracellular signaling requirement for NLGN2-mediated inhibitory presynaptic differentiation.\",\n      \"method\": \"Pharmacological inhibition of kinase pathways, synaptogenesis assay in cultured neurons\",\n      \"journal\": \"Frontiers in molecular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological dissection of signaling requirements with defined cellular assay, single lab\",\n      \"pmids\": [\"38571813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In pancreatic acinar cells, NLGN2 localizes to tight junctions and is required for formation of the PALS1/PATJ polarity complex, which reduces YAP activity to maintain contact inhibition; NLGN2 is lost progressively from low- to high-grade pancreatic intraepithelial neoplasias.\",\n      \"method\": \"Immunolocalization, KO/knockdown experiments, PALS1/PATJ complex assessment, YAP activity assay\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined molecular pathway (PALS1/PATJ-YAP axis) and direct localization data, single lab\",\n      \"pmids\": [\"38413734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NLGN2 silencing in endothelial cells strongly reduces Angiopoietin 2 (Ang2) release upon VEGF stimulation and increases retention of Weibel-Palade bodies; NLGN2 overexpression depletes Weibel-Palade bodies; NLGN2 null mice show immature vasculature with lower pericyte coverage and reduced Tie2 phosphorylation; NLGN2 co-localizes with collybistin in endothelial cells.\",\n      \"method\": \"siRNA knockdown, NLGN2 overexpression, in vitro Ang2 secretion assay, NLGN2 null mouse in vivo vascular analysis, immunolocalization\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional manipulation in vitro with in vivo confirmation in KO mice; single lab\",\n      \"pmids\": [\"29709479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"HIV-1 Tat exposure of astrocytes induces release of extracellular vesicles containing miR-7, which is taken up by neurons and downregulates neuronal NLGN2, leading to synaptic alterations that are reversed by PDGF-CC pretreatment.\",\n      \"method\": \"Astrocyte culture, extracellular vesicle isolation, miR-7 quantification, neuronal NLGN2 measurement, synaptic assay\",\n      \"journal\": \"Journal of neuroimmune pharmacology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — indirect mechanism involving EV-miRNA with NLGN2 as downstream target; single lab, no direct NLGN2 rescue experiment described in abstract\",\n      \"pmids\": [\"31401755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Mass photometry revealed that recombinant human NLGN2 extracellular domain exists in a concentration-dependent monomer-dimer equilibrium at nanomolar concentrations, with NLGN2 showing intermediate homodimerization affinity compared to NLGN3 (highest) and NLGN1 (lowest), indicating isoform-specific dimer interface properties.\",\n      \"method\": \"Mass photometry, size exclusion chromatography-MALS\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — direct biophysical measurement of dimerization equilibrium with orthogonal method (SEC-MALS) but single lab, no functional validation of the monomer-dimer distinction\",\n      \"pmids\": [\"42033941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Beta-Nrxn1 (but not alpha-Nrxn1) can be recruited to synaptic contacts by both GABAergic NLGN2 and glutamatergic NLGN1 in transcellular assays; insertion of alternative spliced segment 4 (AS4) negatively modulates presynaptic recruitment of Nrxn1 by neuroligins; an autism-associated mutant beta-Nrxn1 shows ligand restriction to glutamatergic NLGN1, losing interaction with NLGN2.\",\n      \"method\": \"Transcellular synaptic recruitment assay, neurexin isoform analysis in autism mouse model\",\n      \"journal\": \"Molecular brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct transcellular functional assay plus in vivo mouse model validation; single lab\",\n      \"pmids\": [\"40087687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Nlgn2 deletion in adult medial prefrontal cortex or knockdown selectively in dopamine D1-positive cells in nucleus accumbens promotes stress susceptibility, while knockdown in D2-positive cells mediates active defensive behavior, establishing cell-type-specific roles for NLGN2 in NAc circuits underlying depression and stress.\",\n      \"method\": \"Cell-type-specific viral knockdown, chronic social defeat stress, behavioral tests\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific loss-of-function with defined behavioral readouts; single lab\",\n      \"pmids\": [\"29339486\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NLGN2 is a postsynaptic cell-adhesion molecule that functions exclusively at GABAergic inhibitory synapses by forming trans-synaptic bridges with presynaptic neurexins (primarily beta-Nrxn1 and alpha-Nrxn1); its extracellular domain confers inhibitory synapse specificity while its intracellular domain recruits gephyrin and stabilizes GABAA receptors through both gephyrin-dependent (R705) and gephyrin-independent (S714 phosphorylation) mechanisms; it undergoes SNX27-mediated endosomal recycling to maintain synaptic surface levels, is subject to FMRP-dependent local translation and NMDA-induced proteolytic cleavage, is regulated in cis by MDGA1 (which sterically occludes neurexin binding), and is required for inhibitory LTP consolidation in hippocampal CA1; loss of NLGN2 impairs inhibitory synaptic transmission in amygdala, prefrontal cortex, hippocampus, and lateral habenula, producing anxiety, cognitive, and social behavioral deficits, while non-neuronally it regulates Angiopoietin 2 secretion via endothelial Weibel-Palade bodies and epithelial contact inhibition via the PALS1/PATJ-YAP axis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NLGN2 is a postsynaptic cell-adhesion molecule that organizes GABAergic inhibitory synapses by forming trans-synaptic bridges with presynaptic neurexins, and its abundance directly sets inhibitory synapse number and signaling strength [#11, #14]. Its extracellular domain confers inhibitory-synapse specificity while its cytoplasmic tail is indispensable for function, acting through two intracellular routes: a gephyrin-dependent arm (disrupted by the autism-associated R705 mutation) and a gephyrin-independent arm requiring the S714 phosphorylation site [#3]; the gephyrin-binding motif is essential for NLGN2 but, despite identical sequence, dispensable for NLGN1 at excitatory synapses, indicating isoform-specific intracellular wiring [#18]. The neurexin bridge is competitively and conformationally regulated in cis: MDGA1 Ig1-Ig2 spans the NLGN2 dimer and sterically blocks the neurexin-binding surface, with MDGA1's global ectodomain conformation determining its inhibitory effect [#0, #19], and α-dystroglycan competes with NLGN2 for α-neurexin [#13]. Neurexin engagement itself is ligand-selective, with β-Nrxn1 recruited by NLGN2 and modulated by the AS4 splice insert [#29]. Surface NLGN2 levels are maintained by SNX27-mediated endosomal recycling via a PDZ interaction, which tunes inhibitory synapse composition [#4], and its expression is set by FMRP-dependent repression of local translation together with NMDA-induced proteolytic cleavage [#5]. Functionally, NLGN2-neurexin adhesion drives gephyrin clustering required for inhibitory LTP consolidation in CA1 [#17], and loss of NLGN2 reduces inhibitory transmission across prefrontal cortex, amygdala, raphe, and other circuits, producing anxiety, cognitive, social, and stress-related behavioral deficits [#7, #8, #30]; the R215H mutation abolishes protein expression and recapitulates GABAergic and behavioral pathology in vivo [#1, #12]. Beyond neurons, NLGN2 controls Angiopoietin-2 secretion from endothelial Weibel-Palade bodies [#26] and supports epithelial contact inhibition through assembly of the PALS1/PATJ polarity complex that restrains YAP [#25].\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Established that a specific missense mutation disrupts NLGN2 trafficking and that the NRXN2-NLGN2 interaction is required for synaptic differentiation, linking molecular adhesion to GABAergic synaptogenesis.\",\n      \"evidence\": \"R215H ER-retention assay by ICC/electrophysiology, and NRXN2 truncation binding/coculture assays\",\n      \"pmids\": [\"21551456\", \"21424692\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not resolve the in vivo behavioral consequence of trafficking loss\", \"Single-lab cell-based assays without structural detail of the binding interface\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed that bidirectionally manipulating hippocampal NLGN2 shifts excitation/inhibition balance and social/emotional behavior, connecting synaptic adhesion to circuit-level behavior.\",\n      \"evidence\": \"AAV overexpression and neurolide-2 peptide disruption in rat hippocampus with GAD65/protein quantification and behavioral tests\",\n      \"pmids\": [\"23451101\", \"24213355\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Peptide and overexpression effects are correlative for endogenous synapse dynamics\", \"Circuit specificity not dissected\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified α-dystroglycan as a competitor for α-neurexin binding, revealing that NLGN2's trans-synaptic bridge is regulated by competition at the neurexin surface.\",\n      \"evidence\": \"Site-directed mutagenesis and binding/glycan assays mapping LNS2/LNS6 binding\",\n      \"pmids\": [\"25157101\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Competition shown biochemically but not at native synapses\", \"Functional consequence for inhibitory synapse density untested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated that NLGN2 is continuously required to maintain inhibitory synapses in adult brain, establishing an ongoing rather than purely developmental role.\",\n      \"evidence\": \"Adult conditional/regional Nlgn2 KO in mPFC and amygdala with electrophysiology, IHC, cFOS, and behavior\",\n      \"pmids\": [\"25824299\", \"26142252\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the maintenance signaling pathway\", \"Cell-type specificity within each region only partially resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Dissected the extracellular versus intracellular contributions, defining inhibitory-synapse specificity in the ectodomain and two separable cytoplasmic arms (gephyrin-dependent R705, gephyrin-independent S714).\",\n      \"evidence\": \"Chimeric construct rescue and mutagenesis with CA1 electrophysiology; also showed NLGN3 depends on NLGN2\",\n      \"pmids\": [\"27805570\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"S714 phosphorylation site is putative; the kinase and gephyrin-independent effector were not identified\", \"Did not establish the SERT-NLGN2 complex stoichiometry described separately\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extended NLGN2 function beyond classic inhibitory synapses to somatodendritic complexes with the serotonin transporter, linking NLGN2 to serotonergic raphe physiology.\",\n      \"evidence\": \"Reciprocal Co-IP, ISH, ICC, and electrophysiology in Nlgn2 null mice\",\n      \"pmids\": [\"26793096\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which NLGN2 stabilizes SERT is undefined\", \"Direct versus indirect nature of the SERT complex unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Provided the structural basis for cis-regulation, showing MDGA1 sterically occludes the neurexin-binding region of the NLGN2 dimer.\",\n      \"evidence\": \"Crystal structure of MDGA1 Ig1-Ig2 bound to NLGN2 dimer with mutagenesis and affinity measurements\",\n      \"pmids\": [\"28641112\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish in vivo MDGA1 stoichiometry or regulation\", \"Conformational requirements addressed only later\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified post-transcriptional and post-translational control of NLGN2 levels through FMRP-repressed local translation and NMDA-triggered cleavage, and confirmed the R215H mutation causes loss of protein and pathology in vivo.\",\n      \"evidence\": \"RNA-IP/synaptoneurosome translation assays, NMDA cleavage western blots, and R215H knock-in mouse phenotyping\",\n      \"pmids\": [\"30056576\", \"29859117\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Protease responsible for NMDA-induced cleavage not identified\", \"Functional impact of cleavage on synapse stability not quantified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Placed NLGN2 within defined circuit and genetic frameworks, identifying IgSF9b as an epistatic modifier in amygdala and cell-type-specific NAc roles in stress behavior.\",\n      \"evidence\": \"Nlgn2/IgSF9b double KO and D1/D2 cell-type-specific viral knockdown with electrophysiology and behavior\",\n      \"pmids\": [\"30573727\", \"29339486\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular interaction between NLGN2 and IgSF9b not established\", \"How cell-type identity dictates opposite behavioral outcomes unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealed a non-neuronal endothelial role, where NLGN2 controls Angiopoietin-2 release from Weibel-Palade bodies and vascular maturation.\",\n      \"evidence\": \"siRNA/overexpression Ang2 secretion assays and Nlgn2 null vascular analysis with collybistin co-localization\",\n      \"pmids\": [\"29709479\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism coupling NLGN2 to Weibel-Palade body exocytosis unknown\", \"Whether collybistin mediates the endothelial function untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established surface-level maintenance via SNX27-mediated endosomal recycling and showed NLGN2 dosage directly sets inhibitory synapse number in human neurons.\",\n      \"evidence\": \"Co-IP/knockdown of SNX27 with electrophysiology, and NLGN2 OE/KD in iPSC-derived interneurons with puncta quantification\",\n      \"pmids\": [\"31775031\", \"31780643\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signals triggering NLGN2 endocytosis versus recycling not defined\", \"Link between recycling and activity-dependent plasticity untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified an indirect regulatory route in which astrocyte-derived EV miR-7 downregulates neuronal NLGN2 under HIV-1 Tat exposure.\",\n      \"evidence\": \"Astrocyte EV isolation, miR-7 quantification, and neuronal NLGN2/synaptic measurement\",\n      \"pmids\": [\"31401755\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct NLGN2 rescue experiment confirming causality\", \"Single-lab, indirect mechanism with NLGN2 only as downstream target\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Positioned NLGN2 in a compensatory homeostatic pathway whereby excitatory scaffold loss upregulates and traffics NLGN2 to strengthen inhibition.\",\n      \"evidence\": \"PSD-95 heterozygous mice with electrophysiology, western blot, and trafficking assays\",\n      \"pmids\": [\"32818520\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signal coupling PSD-95 loss to NLGN2 trafficking not identified\", \"Whether this is direct or circuit-mediated unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided full-length dimer architecture, showing isoform-specific protomer rotations that could underlie differential MDGA regulation.\",\n      \"evidence\": \"Cryo-EM structures of human NLGN2 and NLGN3 homodimers with structural comparison\",\n      \"pmids\": [\"36479216\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of the rotational difference not validated\", \"Link to MDGA selectivity remains structural inference\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showed that MDGA1's global 3D conformation, not just its interaction interface, governs its ability to suppress NLGN2-mediated presynaptic differentiation.\",\n      \"evidence\": \"Crystal structure plus elbow mutants with cell-based binding and presynaptic differentiation assays\",\n      \"pmids\": [\"36889589\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological trigger that alters MDGA1 conformation unknown\", \"In vivo relevance of conformational regulation untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined NLGN2's mechanistic role in inhibitory plasticity and its distinct intracellular signaling requirements, and extended its biology to pancreatic epithelial polarity.\",\n      \"evidence\": \"Neurolide-2/optogenetics iLTP assays in CA1, kinase-inhibitor synaptogenesis assays, and pancreatic acinar KO with PALS1/PATJ-YAP readouts\",\n      \"pmids\": [\"41802868\", \"38571813\", \"38413734\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CaMKII/Src/JNK signaling converges on NLGN2 synaptogenic output is unclear\", \"Mechanism linking NLGN2 to PALS1/PATJ assembly at tight junctions undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolved MDGA1 as a genetic modifier of NLGN2 in vivo and clarified the divergence between NLGN2 and NLGN1 intracellular mechanisms despite shared gephyrin motifs.\",\n      \"evidence\": \"Nlgn2/MDGA1 double KO with electrophysiology/IHC/behavior; chimeric rescue in neuroligin-deficient neurons\",\n      \"pmids\": [\"39284869\", \"39747663\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The effector distinguishing identical gephyrin motifs in NLGN1 versus NLGN2 not identified\", \"Layer-specific gephyrin loss mechanism unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Refined ligand selectivity and demonstrated a stress-regulated NLGN2-MDGA1 interaction in the lateral habenula controlling depression susceptibility.\",\n      \"evidence\": \"Transcellular neurexin recruitment assays with AS4 splice analysis; LHb conditional KO and NLGN2 binding-deficient knock-in with electrophysiology and behavior\",\n      \"pmids\": [\"40087687\", \"39897557\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How chronic stress increases NLGN2-MDGA1 binding mechanistically is unknown\", \"Whether AS4-modulated selectivity operates at native synapses untested\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Quantified isoform-specific homodimerization, showing NLGN2 occupies an intermediate monomer-dimer equilibrium relative to NLGN1 and NLGN3.\",\n      \"evidence\": \"Mass photometry and SEC-MALS of recombinant NLGN2 ectodomain\",\n      \"pmids\": [\"42033941\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of the dimerization equilibrium not established\", \"No link to in vivo synaptic clustering demonstrated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The effectors that distinguish the identical NLGN1/NLGN2 gephyrin-binding motifs, the gephyrin-independent S714 pathway, and the protease and physiological control of NMDA-induced NLGN2 cleavage remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No kinase or downstream effector identified for the S714 gephyrin-independent arm\", \"Protease mediating NLGN2 cleavage unknown\", \"Mechanism converting shared gephyrin motif into isoform-specific function unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 2, 3, 29]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 4, 25]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 4, 14]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [3, 7, 17]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [0, 2, 29]}\n    ],\n    \"complexes\": [\"gephyrin postsynaptic scaffold\", \"PALS1/PATJ polarity complex\"],\n    \"partners\": [\"NRXN1\", \"NRXN2\", \"MDGA1\", \"GPHN\", \"SNX27\", \"FMR1\", \"SLC6A4\", \"DAG1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}