{"gene":"NLGN4X","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2003,"finding":"NLGN4X encodes a cell-adhesion molecule localized at the synapse; loss-of-function mutations in NLGN4X (and NLGN3) are associated with autism-spectrum disorders, implicating defective synaptogenesis as a predisposing mechanism.","method":"Genetic sequencing of autism-spectrum siblings identifying mutations in X-linked neuroligin genes","journal":"Nature genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — genetic identification of mutations with cellular localization annotation, replicated in subsequent population studies; no in vitro reconstitution of mechanism","pmids":["12669065"],"is_preprint":false},{"year":2004,"finding":"A 2-bp deletion in NLGN4X leading to a premature stop codon is predicted to suppress the transmembrane domain and sequences required for neuroligin dimerization and beta-neurexin binding, linking the mutation to loss of synaptic cell-cell interaction in X-linked mental retardation and autism.","method":"Sequencing of NLGN4X in a large pedigree; protein domain analysis of truncating mutation","journal":"American journal of human genetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single-lab genetic study with protein domain inference; dimerization and neurexin-binding consequences inferred from truncation, not directly tested in vitro","pmids":["14963808"],"is_preprint":false},{"year":2020,"finding":"NLGN4Y (97% homologous to NLGN4X) displays severe deficits in protein maturation, surface expression, and synaptogenesis compared to NLGN4X, regulated by a single amino acid difference. A cluster of ASD-associated mutations in NLGN4X surrounding this critical residue phenocopies NLGN4Y's deficits. NLGN4Y cannot compensate for the functional deficits of ASD-associated NLGN4X mutations.","method":"Biochemistry (protein maturation/surface expression assays), electrophysiology (synaptic function), imaging (subcellular localization); site-directed mutagenesis of critical residue; comparison of NLGN4X vs NLGN4Y","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (biochemistry, electrophysiology, imaging, mutagenesis) in a single rigorous study establishing molecular mechanism","pmids":["32243781"],"is_preprint":false},{"year":2013,"finding":"NLGN4X knockdown in neural stem cells delays neuronal development and compromises neurite formation during differentiation, with decreased expression of postsynaptic genes including DLG4, NLGN1, and NLGN3, demonstrating a direct role for NLGN4X in neurodevelopment.","method":"shRNAmir-based NLGN4X knockdown in neural stem cells, morphological analysis, whole-genome gene expression profiling at multiple time points during neuronal differentiation","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal methods (morphology + transcriptomics) in a defined loss-of-function model; single lab","pmids":["23710042"],"is_preprint":false},{"year":2013,"finding":"Loss of Nlgn4 in mice decreases network response to stimulation in both excitatory and inhibitory circuits of somatosensory cortex and reduces the excitation-inhibition ratio, indicating Nlgn4 regulates balanced circuit activity.","method":"Multi-electrode array stimulation and recording of cortical slices from Nlgn4 knockout vs. wild-type mice; patch-clamp electrophysiology of single neurons","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean knockout with defined electrophysiological phenotypes using two complementary recording methods; single lab","pmids":["24104404"],"is_preprint":false},{"year":2025,"finding":"NLGN4X is phosphorylated at serine 712 by PKA (exclusively) and Cdk5; this phosphorylation regulates spine density—phosphorylation at S712 reduces mature mushroom spines, whereas unphosphorylated S712 increases spine density and enhances miniature excitatory postsynaptic current frequency.","method":"Site-directed mutagenesis of S712; kinase activity assays identifying PKA and Cdk5 as writers; spine morphology analysis; mEPSC electrophysiology","journal":"eNeuro","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with kinase identification, structural phenotype (spinogenesis), and functional electrophysiology readout in a single study; single lab but multiple orthogonal methods","pmids":["40032531"],"is_preprint":false},{"year":2024,"finding":"In melanoma, NLGN4X suppression downregulates the prefoldin member VBP1, leading to HIF1A accumulation and HIF1A-dependent acquisition of migratory properties; re-expression of NLGN4X in late-stage melanoma lines decreases tumor growth in human skin organoid transplantation models.","method":"Loss- and gain-of-function experiments in vitro; tumorsphere/organoid transplantation; whole-genome expression analysis and validation; VBP1 knockdown epistasis","journal":"British journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (transcriptomics, epistasis via VBP1 KD, organoid transplantation) in a single study; single lab; non-neural context for NLGN4X","pmids":["38902533"],"is_preprint":false},{"year":2024,"finding":"NLGN4X harbors an HLA-A*02-restricted tumor-associated antigen (peptide NLGN4X131-139) that induces specific cytotoxic T cell responses; TCR-engineered T cells targeting this antigen demonstrate cytotoxicity against NLGN4X-expressing glioma cells and prolong survival in NSG MHC I/II KO mice bearing experimental gliomas.","method":"Droplet-based single-cell TCR sequencing of NLGN4X-tetramer-sorted T cells; functional profiling by flow cytometry and cytotoxicity assays; intracerebroventricular administration in NSG MHC I/II KO mouse glioma model","journal":"Neuro-oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — TCR identification plus in vitro cytotoxicity and in vivo efficacy experiments; single lab; mechanistic context is immunological rather than synaptic","pmids":["37715782"],"is_preprint":false}],"current_model":"NLGN4X encodes a postsynaptic cell-adhesion molecule that binds presynaptic neurexins to promote synapse formation and maturation; its maturation and surface expression depend on a critical amino acid that distinguishes it from the non-functional paralog NLGN4Y, and its synaptic activity is regulated by PKA- and Cdk5-mediated phosphorylation at serine 712, which bidirectionally controls spine density and excitatory synaptic transmission; loss of NLGN4X disrupts excitatory/inhibitory circuit balance and neurite development, while in non-neural contexts NLGN4X regulates HIF1A levels via VBP1 and presents a tumor-associated antigen recognized by cytotoxic T cells."},"narrative":{"mechanistic_narrative":"NLGN4X encodes a postsynaptic cell-adhesion molecule that promotes synapse formation and neuronal development, and its disruption is genetically linked to autism-spectrum disorders and X-linked mental retardation, implicating defective synaptogenesis as the predisposing mechanism [PMID:12669065, PMID:14963808]. Functional maturation of NLGN4X depends on a single critical amino acid that distinguishes it from the paralog NLGN4Y; this residue governs protein maturation, surface expression, and synaptogenic activity, and ASD-associated mutations clustering around it phenocopy the non-functional NLGN4Y, which cannot compensate for the deficits [PMID:32243781]. Synaptic activity is further tuned by phosphorylation at serine 712 by PKA and Cdk5, which bidirectionally controls dendritic spine density and excitatory transmission: phosphorylated S712 reduces mature spines whereas unphosphorylated S712 increases spine density and miniature excitatory postsynaptic current frequency [PMID:40032531]. At the circuit and developmental level, loss of NLGN4X delays neurite formation and downregulates postsynaptic genes [PMID:23710042], and knockout reduces the excitation-inhibition ratio in cortical circuits [PMID:24104404]. Beyond the nervous system, NLGN4X acts in non-neural contexts—suppressing tumor growth via a VBP1–HIF1A axis in melanoma [PMID:38902533] and presenting an HLA-A*02-restricted tumor-associated antigen recognized by cytotoxic T cells in glioma [PMID:37715782].","teleology":[{"year":2003,"claim":"Established NLGN4X as a synaptic cell-adhesion molecule whose loss-of-function links to autism, framing defective synaptogenesis as a disease mechanism.","evidence":"Genetic sequencing of autism-spectrum siblings identifying mutations in X-linked neuroligin genes","pmids":["12669065"],"confidence":"Medium","gaps":["No in vitro reconstitution of the synaptogenic mechanism","Causality of mutations not functionally demonstrated"]},{"year":2004,"claim":"Refined the disease mechanism by showing a truncating mutation removes the transmembrane domain and sequences needed for dimerization and beta-neurexin binding, implying loss of synaptic cell-cell interaction.","evidence":"Sequencing of NLGN4X in a large pedigree with protein domain analysis of a 2-bp deletion","pmids":["14963808"],"confidence":"Low","gaps":["Dimerization and neurexin-binding consequences inferred from truncation, not directly tested in vitro","Single-lab genetic study"]},{"year":2013,"claim":"Defined a developmental requirement for NLGN4X in neurite formation and postsynaptic gene expression during neuronal differentiation.","evidence":"shRNAmir knockdown in neural stem cells with morphology and whole-genome expression profiling","pmids":["23710042"],"confidence":"Medium","gaps":["Single-lab loss-of-function model","Direct vs. indirect regulation of downstream postsynaptic genes not resolved"]},{"year":2013,"claim":"Connected NLGN4X loss to circuit-level dysfunction by demonstrating reduced excitation-inhibition ratio in cortical networks.","evidence":"Multi-electrode array and patch-clamp electrophysiology of cortical slices from Nlgn4 knockout mice","pmids":["24104404"],"confidence":"Medium","gaps":["Molecular basis of E/I imbalance not defined","Single lab"]},{"year":2020,"claim":"Identified a single critical residue controlling NLGN4X maturation and synaptogenesis, explaining why the paralog NLGN4Y is non-functional and why ASD mutations near this residue are pathogenic.","evidence":"Biochemistry, electrophysiology, imaging, and site-directed mutagenesis comparing NLGN4X vs NLGN4Y","pmids":["32243781"],"confidence":"High","gaps":["Structural basis of how the residue governs maturation not resolved","In vivo consequence of the residue swap not tested"]},{"year":2024,"claim":"Revealed a non-neural tumor-suppressive function of NLGN4X acting through a VBP1–HIF1A axis in melanoma.","evidence":"Loss/gain-of-function, VBP1 knockdown epistasis, transcriptomics, and skin organoid transplantation","pmids":["38902533"],"confidence":"Medium","gaps":["Mechanism by which NLGN4X controls VBP1 unknown","Single lab, non-neural context"]},{"year":2024,"claim":"Showed NLGN4X harbors an HLA-A*02-restricted tumor-associated antigen exploitable for TCR-engineered T cell therapy in glioma.","evidence":"Single-cell TCR sequencing of tetramer-sorted T cells, cytotoxicity assays, and NSG mouse glioma model","pmids":["37715782"],"confidence":"Medium","gaps":["Endogenous antigen processing/presentation in vivo not fully characterized","Single lab"]},{"year":2025,"claim":"Established phosphorylation of NLGN4X at serine 712 by PKA and Cdk5 as a bidirectional switch controlling spine density and excitatory transmission.","evidence":"Site-directed mutagenesis of S712, kinase activity assays, spine morphology analysis, and mEPSC electrophysiology","pmids":["40032531"],"confidence":"High","gaps":["Upstream signals triggering PKA/Cdk5 phosphorylation unknown","Single lab"]},{"year":null,"claim":"How NLGN4X's synaptic adhesion function is mechanistically connected to its non-neural roles (VBP1–HIF1A regulation, antigen presentation) remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying biochemical mechanism linking synaptic and tumor-context functions","Neurexin-binding consequences of disease mutations not directly demonstrated in the corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,2]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,2]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[4,5]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[3]}],"complexes":[],"partners":["VBP1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8N0W4","full_name":"Neuroligin-4, X-linked","aliases":["HNLX"],"length_aa":816,"mass_kda":91.9,"function":"Cell surface protein involved in cell-cell-interactions via its interactions with neurexin family members","subcellular_location":"Cell membrane; Postsynaptic density membrane; Cell projection, dendritic spine; Cell projection, dendrite; Synapse","url":"https://www.uniprot.org/uniprotkb/Q8N0W4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NLGN4X","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/NLGN4X","total_profiled":1310},"omim":[{"mim_id":"300495","title":"AUTISM, SUSCEPTIBILITY TO, X-LINKED 2; AUTSX2","url":"https://www.omim.org/entry/300495"},{"mim_id":"300427","title":"NEUROLIGIN 4, X-LINKED; NLGN4X","url":"https://www.omim.org/entry/300427"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":11.8},{"tissue":"lymphoid tissue","ntpm":13.3},{"tissue":"ovary","ntpm":13.8}],"url":"https://www.proteinatlas.org/search/NLGN4X"},"hgnc":{"alias_symbol":["KIAA1260","NLGN","HLNX"],"prev_symbol":["NLGN4"]},"alphafold":{"accession":"Q8N0W4","domains":[{"cath_id":"3.40.50.1820","chopping":"46-587","consensus_level":"medium","plddt":93.9927,"start":46,"end":587}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N0W4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N0W4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N0W4-F1-predicted_aligned_error_v6.png","plddt_mean":79.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NLGN4X","jax_strain_url":"https://www.jax.org/strain/search?query=NLGN4X"},"sequence":{"accession":"Q8N0W4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8N0W4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8N0W4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N0W4"}},"corpus_meta":[{"pmid":"12669065","id":"PMC_12669065","title":"Mutations of the X-linked genes encoding neuroligins NLGN3 and NLGN4 are associated with autism.","date":"2003","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/12669065","citation_count":1343,"is_preprint":false},{"pmid":"14963808","id":"PMC_14963808","title":"X-linked mental retardation and autism are associated with a mutation in the NLGN4 gene, a member of the neuroligin family.","date":"2004","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/14963808","citation_count":554,"is_preprint":false},{"pmid":"18231125","id":"PMC_18231125","title":"Familial deletion within NLGN4 associated with autism and Tourette syndrome.","date":"2008","source":"European journal of human genetics : EJHG","url":"https://pubmed.ncbi.nlm.nih.gov/18231125","citation_count":205,"is_preprint":false},{"pmid":"16648374","id":"PMC_16648374","title":"Novel splice isoforms for NLGN3 and NLGN4 with possible implications in autism.","date":"2006","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/16648374","citation_count":131,"is_preprint":false},{"pmid":"23183221","id":"PMC_23183221","title":"Development of an autism severity score for mice using Nlgn4 null mutants as a construct-valid model of heritable monogenic autism.","date":"2012","source":"Behavioural brain research","url":"https://pubmed.ncbi.nlm.nih.gov/23183221","citation_count":98,"is_preprint":false},{"pmid":"15389766","id":"PMC_15389766","title":"NLGN3/NLGN4 gene mutations are not responsible for autism in the Quebec population.","date":"2005","source":"American journal of medical genetics. 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loss-of-function mutations in NLGN4X (and NLGN3) are associated with autism-spectrum disorders, implicating defective synaptogenesis as a predisposing mechanism.\",\n      \"method\": \"Genetic sequencing of autism-spectrum siblings identifying mutations in X-linked neuroligin genes\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — genetic identification of mutations with cellular localization annotation, replicated in subsequent population studies; no in vitro reconstitution of mechanism\",\n      \"pmids\": [\"12669065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A 2-bp deletion in NLGN4X leading to a premature stop codon is predicted to suppress the transmembrane domain and sequences required for neuroligin dimerization and beta-neurexin binding, linking the mutation to loss of synaptic cell-cell interaction in X-linked mental retardation and autism.\",\n      \"method\": \"Sequencing of NLGN4X in a large pedigree; protein domain analysis of truncating mutation\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single-lab genetic study with protein domain inference; dimerization and neurexin-binding consequences inferred from truncation, not directly tested in vitro\",\n      \"pmids\": [\"14963808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NLGN4Y (97% homologous to NLGN4X) displays severe deficits in protein maturation, surface expression, and synaptogenesis compared to NLGN4X, regulated by a single amino acid difference. A cluster of ASD-associated mutations in NLGN4X surrounding this critical residue phenocopies NLGN4Y's deficits. NLGN4Y cannot compensate for the functional deficits of ASD-associated NLGN4X mutations.\",\n      \"method\": \"Biochemistry (protein maturation/surface expression assays), electrophysiology (synaptic function), imaging (subcellular localization); site-directed mutagenesis of critical residue; comparison of NLGN4X vs NLGN4Y\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (biochemistry, electrophysiology, imaging, mutagenesis) in a single rigorous study establishing molecular mechanism\",\n      \"pmids\": [\"32243781\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NLGN4X knockdown in neural stem cells delays neuronal development and compromises neurite formation during differentiation, with decreased expression of postsynaptic genes including DLG4, NLGN1, and NLGN3, demonstrating a direct role for NLGN4X in neurodevelopment.\",\n      \"method\": \"shRNAmir-based NLGN4X knockdown in neural stem cells, morphological analysis, whole-genome gene expression profiling at multiple time points during neuronal differentiation\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal methods (morphology + transcriptomics) in a defined loss-of-function model; single lab\",\n      \"pmids\": [\"23710042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Loss of Nlgn4 in mice decreases network response to stimulation in both excitatory and inhibitory circuits of somatosensory cortex and reduces the excitation-inhibition ratio, indicating Nlgn4 regulates balanced circuit activity.\",\n      \"method\": \"Multi-electrode array stimulation and recording of cortical slices from Nlgn4 knockout vs. wild-type mice; patch-clamp electrophysiology of single neurons\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean knockout with defined electrophysiological phenotypes using two complementary recording methods; single lab\",\n      \"pmids\": [\"24104404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NLGN4X is phosphorylated at serine 712 by PKA (exclusively) and Cdk5; this phosphorylation regulates spine density—phosphorylation at S712 reduces mature mushroom spines, whereas unphosphorylated S712 increases spine density and enhances miniature excitatory postsynaptic current frequency.\",\n      \"method\": \"Site-directed mutagenesis of S712; kinase activity assays identifying PKA and Cdk5 as writers; spine morphology analysis; mEPSC electrophysiology\",\n      \"journal\": \"eNeuro\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with kinase identification, structural phenotype (spinogenesis), and functional electrophysiology readout in a single study; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"40032531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In melanoma, NLGN4X suppression downregulates the prefoldin member VBP1, leading to HIF1A accumulation and HIF1A-dependent acquisition of migratory properties; re-expression of NLGN4X in late-stage melanoma lines decreases tumor growth in human skin organoid transplantation models.\",\n      \"method\": \"Loss- and gain-of-function experiments in vitro; tumorsphere/organoid transplantation; whole-genome expression analysis and validation; VBP1 knockdown epistasis\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (transcriptomics, epistasis via VBP1 KD, organoid transplantation) in a single study; single lab; non-neural context for NLGN4X\",\n      \"pmids\": [\"38902533\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NLGN4X harbors an HLA-A*02-restricted tumor-associated antigen (peptide NLGN4X131-139) that induces specific cytotoxic T cell responses; TCR-engineered T cells targeting this antigen demonstrate cytotoxicity against NLGN4X-expressing glioma cells and prolong survival in NSG MHC I/II KO mice bearing experimental gliomas.\",\n      \"method\": \"Droplet-based single-cell TCR sequencing of NLGN4X-tetramer-sorted T cells; functional profiling by flow cytometry and cytotoxicity assays; intracerebroventricular administration in NSG MHC I/II KO mouse glioma model\",\n      \"journal\": \"Neuro-oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — TCR identification plus in vitro cytotoxicity and in vivo efficacy experiments; single lab; mechanistic context is immunological rather than synaptic\",\n      \"pmids\": [\"37715782\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NLGN4X encodes a postsynaptic cell-adhesion molecule that binds presynaptic neurexins to promote synapse formation and maturation; its maturation and surface expression depend on a critical amino acid that distinguishes it from the non-functional paralog NLGN4Y, and its synaptic activity is regulated by PKA- and Cdk5-mediated phosphorylation at serine 712, which bidirectionally controls spine density and excitatory synaptic transmission; loss of NLGN4X disrupts excitatory/inhibitory circuit balance and neurite development, while in non-neural contexts NLGN4X regulates HIF1A levels via VBP1 and presents a tumor-associated antigen recognized by cytotoxic T cells.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NLGN4X encodes a postsynaptic cell-adhesion molecule that promotes synapse formation and neuronal development, and its disruption is genetically linked to autism-spectrum disorders and X-linked mental retardation, implicating defective synaptogenesis as the predisposing mechanism [#0, #1]. Functional maturation of NLGN4X depends on a single critical amino acid that distinguishes it from the paralog NLGN4Y; this residue governs protein maturation, surface expression, and synaptogenic activity, and ASD-associated mutations clustering around it phenocopy the non-functional NLGN4Y, which cannot compensate for the deficits [#2]. Synaptic activity is further tuned by phosphorylation at serine 712 by PKA and Cdk5, which bidirectionally controls dendritic spine density and excitatory transmission: phosphorylated S712 reduces mature spines whereas unphosphorylated S712 increases spine density and miniature excitatory postsynaptic current frequency [#5]. At the circuit and developmental level, loss of NLGN4X delays neurite formation and downregulates postsynaptic genes [#3], and knockout reduces the excitation-inhibition ratio in cortical circuits [#4]. Beyond the nervous system, NLGN4X acts in non-neural contexts—suppressing tumor growth via a VBP1–HIF1A axis in melanoma [#6] and presenting an HLA-A*02-restricted tumor-associated antigen recognized by cytotoxic T cells in glioma [#7].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established NLGN4X as a synaptic cell-adhesion molecule whose loss-of-function links to autism, framing defective synaptogenesis as a disease mechanism.\",\n      \"evidence\": \"Genetic sequencing of autism-spectrum siblings identifying mutations in X-linked neuroligin genes\",\n      \"pmids\": [\"12669065\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vitro reconstitution of the synaptogenic mechanism\", \"Causality of mutations not functionally demonstrated\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Refined the disease mechanism by showing a truncating mutation removes the transmembrane domain and sequences needed for dimerization and beta-neurexin binding, implying loss of synaptic cell-cell interaction.\",\n      \"evidence\": \"Sequencing of NLGN4X in a large pedigree with protein domain analysis of a 2-bp deletion\",\n      \"pmids\": [\"14963808\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Dimerization and neurexin-binding consequences inferred from truncation, not directly tested in vitro\", \"Single-lab genetic study\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined a developmental requirement for NLGN4X in neurite formation and postsynaptic gene expression during neuronal differentiation.\",\n      \"evidence\": \"shRNAmir knockdown in neural stem cells with morphology and whole-genome expression profiling\",\n      \"pmids\": [\"23710042\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab loss-of-function model\", \"Direct vs. indirect regulation of downstream postsynaptic genes not resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Connected NLGN4X loss to circuit-level dysfunction by demonstrating reduced excitation-inhibition ratio in cortical networks.\",\n      \"evidence\": \"Multi-electrode array and patch-clamp electrophysiology of cortical slices from Nlgn4 knockout mice\",\n      \"pmids\": [\"24104404\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of E/I imbalance not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified a single critical residue controlling NLGN4X maturation and synaptogenesis, explaining why the paralog NLGN4Y is non-functional and why ASD mutations near this residue are pathogenic.\",\n      \"evidence\": \"Biochemistry, electrophysiology, imaging, and site-directed mutagenesis comparing NLGN4X vs NLGN4Y\",\n      \"pmids\": [\"32243781\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of how the residue governs maturation not resolved\", \"In vivo consequence of the residue swap not tested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed a non-neural tumor-suppressive function of NLGN4X acting through a VBP1–HIF1A axis in melanoma.\",\n      \"evidence\": \"Loss/gain-of-function, VBP1 knockdown epistasis, transcriptomics, and skin organoid transplantation\",\n      \"pmids\": [\"38902533\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which NLGN4X controls VBP1 unknown\", \"Single lab, non-neural context\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed NLGN4X harbors an HLA-A*02-restricted tumor-associated antigen exploitable for TCR-engineered T cell therapy in glioma.\",\n      \"evidence\": \"Single-cell TCR sequencing of tetramer-sorted T cells, cytotoxicity assays, and NSG mouse glioma model\",\n      \"pmids\": [\"37715782\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Endogenous antigen processing/presentation in vivo not fully characterized\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established phosphorylation of NLGN4X at serine 712 by PKA and Cdk5 as a bidirectional switch controlling spine density and excitatory transmission.\",\n      \"evidence\": \"Site-directed mutagenesis of S712, kinase activity assays, spine morphology analysis, and mEPSC electrophysiology\",\n      \"pmids\": [\"40032531\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signals triggering PKA/Cdk5 phosphorylation unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NLGN4X's synaptic adhesion function is mechanistically connected to its non-neural roles (VBP1–HIF1A regulation, antigen presentation) remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying biochemical mechanism linking synaptic and tumor-context functions\", \"Neurexin-binding consequences of disease mutations not directly demonstrated in the corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [4, 5]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"VBP1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}