{"gene":"TENM4","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2015,"finding":"Missense mutations in TENM4 cause mislocalization of mutant proteins in oligodendrocyte precursor cells (dominant-negative mechanism), and expression of human TENM4 mRNAs harboring patient mutations in zebrafish embryos induced defects in axon guidance, establishing a dominant-negative mode of action for TENM4 mutations linked to essential tremor.","method":"In vitro mislocalization assay in oligodendrocyte precursor cells; zebrafish mRNA injection with axon guidance phenotype readout; whole-exome sequencing and segregation analysis","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal functional methods (cell-based mislocalization assay + in vivo zebrafish dominant-negative), single lab","pmids":["26188006"],"is_preprint":false},{"year":2004,"finding":"Mouse Odz4 (TENM4 ortholog) is required for establishing the anterior-posterior axis during gastrulation; a loss-of-function allele with a nonconservative amino acid change (conserved to Drosophila) disrupts mesoderm-derived tissues including somites, heart, and skeleton, demonstrating an essential role in embryonic patterning.","method":"ENU mutagenesis allelic series; RT-PCR sequencing of mutant alleles; phenotypic analysis of mouse embryos; intragenic complementation tests","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function with multiple alleles and defined phenotypic readouts, single lab","pmids":["15489520"],"is_preprint":false},{"year":2013,"finding":"Mouse Tenm4 is required for mesoderm induction: loss-of-function Tenm4 mutant embryos fail to form a primitive streak and embryonic mesoderm. Wnt signaling (assessed by TOPGAL reporter) is absent in mutants, GSK3β inhibitor partially rescues the phenotype and restores TOPGAL expression. Epiblast cells remain pluripotent (Pou5f1+) but cannot differentiate in a cell-autonomous manner; misexpression of E-cadherin and N-cadherin suggests failure of epithelial-to-mesenchymal transition.","method":"Loss-of-function mouse genetics; TOPGAL Wnt reporter assay; GSK3β inhibitor rescue; teratoma assay; immunostaining for E-cadherin and N-cadherin; marker gene expression analysis","journal":"BMC developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (reporter assay, pharmacological rescue, cell-autonomous differentiation assay), single lab","pmids":["23521771"],"is_preprint":false},{"year":1999,"finding":"DOC4 (an alias of TENM4) is the 5' fusion partner in a chromosomal translocation in MDA-MB-175 breast cancer cells: the dic(8;11) translocation fuses the DOC4 gene (11q13) to the neuregulin-1/HGL gene (8p12), placing expression of the resulting gamma-heregulin fusion protein under the DOC4 promoter. Gamma-heregulin is thus a fusion oncogene product, not a native NRG1 isoform.","method":"Chromosomal translocation mapping; RT-PCR; cDNA cloning and sequencing; fluorescence in situ hybridization","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Strong — independently confirmed by two groups (PMID 10523851 and PMID 10597312) using complementary molecular methods","pmids":["10523851","10597312"],"is_preprint":false},{"year":2012,"finding":"Odz4/Ten-m4 protein is expressed in quiescent satellite cells but not in activated/proliferating myoblasts, establishing a role for TENM4 in marking the quiescent state of muscle stem cells; its reappearance during regeneration follows a distinct temporal pattern compared to the calcitonin receptor.","method":"Protein-level immunodetection in satellite cells during muscle regeneration; comparison with calcitonin receptor expression timing","journal":"Journal of molecular histology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single method (immunostaining/protein detection), functional consequence not directly tested","pmids":["22562803"],"is_preprint":false},{"year":2023,"finding":"Ten-m4 knockout mice show a specific increase in ipsilateral retinal ganglion cell projections to the dLGN and superior colliculus, particularly from the temporal retina. EphB1 expression in temporal retina is enhanced in KO mice, suggesting TENM4 normally suppresses EphB1-mediated ipsilateral retention at the optic chiasm. This altered projection is associated with changes in responses to ethologically relevant visual stimuli.","method":"Anterograde and retrograde tracing in Ten-m4 knockout mice; EphB1 immunostaining; behavioral visual response assay","journal":"Developmental neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with defined neuroanatomical and molecular phenotype using multiple orthogonal methods, single lab","pmids":["37092850"],"is_preprint":false},{"year":2025,"finding":"TENM4 exon 10 skipping (ΔE10), caused by a splice-site variant, impairs oligodendrocyte differentiation and produces a smaller corpus callosum in mice. Homozygous Tenm4ΔE10/ΔE10 mice show increased seizure susceptibility. During oligodendrocyte progenitor cell differentiation, total Tenm4 transcripts increase markedly and the ratio of full-length to ΔE10 isoform is maintained; an imbalance in this ratio impairs oligodendrocyte development, establishing an isoform-balance mechanism for TENM4 in myelination.","method":"Minigene splicing assay; Tenm4ΔE10 mouse model generation; pentylenetetrazole seizure susceptibility test; corpus callosum morphometry; oligodendrocyte differentiation culture assay; RT-PCR transcript quantification","journal":"Molecular neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (mouse model, in vitro OPC differentiation, seizure assay, isoform quantification), single lab","pmids":["41449293"],"is_preprint":false},{"year":2024,"finding":"Odz4 intracellular domain (ICD) overexpression in embryoid bodies promotes differentiation into pacemaker-like cells with enhanced automaticity and upregulated SAN-specific genes. CellChat analysis revealed SAN-specific enrichment of Ptn-Ncl ligand-receptor signaling, placing Odz4-ICD upstream of sinoatrial node gene programs.","method":"Tet-Off inducible Odz4-ICD expression in embryoid bodies; in situ hybridization; electrophysiology (automaticity); gene expression analysis; CellChat and GO analyses","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function with defined electrophysiological and molecular readouts, single lab","pmids":["39462648"],"is_preprint":false},{"year":2021,"finding":"TENM4 silencing in mammary cancer cells impairs tumorsphere-forming ability, migratory capacity, and FAK (Focal Adhesion Kinase) phosphorylation, indicating TENM4 functions upstream of FAK signaling in cancer stem cell maintenance and migration.","method":"siRNA knockdown; tumorsphere formation assay; migration assay; FAK phosphorylation western blot","journal":"Cancers","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single knockdown approach with functional readouts but no pathway rescue or reconstitution","pmids":["33672732"],"is_preprint":false},{"year":2025,"finding":"Cryo-EM data of Ten2 shows that Latrophilin binding is sterically incompatible with Ten-dimerization, making homophilic and heterophilic interactions mutually exclusive. Surface mutations engineered to disrupt Ten2-Ten2 or Ten2-Latrophilin interactions are transferable to Ten4, indicating conserved binding mechanisms. In vivo, Ten4 is expressed along radial glial cell (RGC) fibers; migrating neurons switch from low to high Ten4 expression. In the cortical plate, Ten4-Ten4 homophilic interactions reduce RGC attachment, while in the intermediate zone, Ten4-Latrophilin interactions promote neuron-RGC association, demonstrating that Ten4 orchestrates cortical neuron migration by toggling between two exclusive binding modes.","method":"Single-particle cryo-EM; engineered surface mutagenesis; in vivo gene editing; super-resolution microscopy; proteomics","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — cryo-EM structure with mutagenesis and in vivo validation, single lab, preprint not yet peer-reviewed","pmids":["bio_10.1101_2025.09.09.671438"],"is_preprint":true},{"year":2024,"finding":"Sensory neuron-specific deletion of Tenm4 in mice causes profound touch insensitivity. Acute proteolytic disassembly of TENM4 at sensory endings rapidly abolishes mechanotransduction, confirming direct involvement in force transduction. Ultrastructural analysis localizes TENM4 to filamentous structures at the neurite-laminin interface, identifying it as a structural extracellular tether that couples extracellular mechanical forces to ion channel activation in mechanoreceptors.","method":"Conditional (sensory neuron-specific) Tenm4 knockout mice; acute protease-mediated TENM4 disassembly; behavioral touch sensitivity assay; ultrastructural/electron microscopy localization","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO plus acute reversible loss-of-function with ultrastructural localization, single lab, preprint","pmids":["bio_10.1101_2024.10.10.617546"],"is_preprint":true}],"current_model":"TENM4 (teneurin-4) is a transmembrane cell-adhesion protein that functions in multiple contexts: it acts as an extracellular mechanosensory tether at neurite-laminin interfaces to gate touch-sensitive ion channels; it orchestrates cortical neuron migration by switching between mutually exclusive homophilic (Ten4-Ten4) and heterophilic (Ten4-Latrophilin) interactions; it regulates oligodendrocyte differentiation and central myelination through isoform-balance of full-length vs. exon-10-skipped transcripts; it is required for Wnt-dependent mesoderm induction and gastrulation in mice; and it shapes ipsilateral retinal projections by suppressing EphB1 expression, with disease-linked missense mutations causing dominant-negative protein mislocalization in oligodendrocyte precursor cells and axon guidance defects in zebrafish."},"narrative":{"mechanistic_narrative":"TENM4 (teneurin-4) is a transmembrane cell-adhesion protein that governs cell positioning and differentiation across neural, developmental, and stem-cell contexts [PMID:bio_10.1101_2025.09.09.671438, PMID:15489520]. In the developing cortex it orchestrates radial neuron migration by toggling between two mutually exclusive adhesive modes — homophilic Ten4-Ten4 binding and heterophilic Ten4-Latrophilin binding — that are sterically incompatible at the structural level, so that homophilic interactions reduce attachment to radial glia in the cortical plate while heterophilic interactions promote neuron-glia association in the intermediate zone [PMID:bio_10.1101_2025.09.09.671438]. At sensory nerve endings TENM4 forms filamentous extracellular tethers at the neurite-laminin interface and couples mechanical force to ion-channel activation, such that its deletion or acute proteolytic disassembly abolishes touch mechanotransduction [PMID:bio_10.1101_2024.10.10.617546]. In the visual system it shapes ipsilateral retinal projections by suppressing EphB1 expression in temporal retina [PMID:37092850], and in the oligodendrocyte lineage it controls differentiation and central myelination through the balance of full-length versus exon-10-skipped (ΔE10) isoforms [PMID:41449293]. During early development TENM4 is required for Wnt-dependent mesoderm induction and gastrulation: loss-of-function embryos fail to form a primitive streak, lack TOPGAL Wnt reporter activity that is partially restored by GSK3β inhibition, and cannot undergo epithelial-to-mesenchymal transition [PMID:23521771, PMID:15489520]. Patient missense mutations act through a dominant-negative mechanism, causing mutant protein mislocalization in oligodendrocyte precursor cells and axon-guidance defects in zebrafish, linking TENM4 to essential tremor [PMID:26188006].","teleology":[{"year":1999,"claim":"Before its developmental roles were known, TENM4 (DOC4) was identified as a chromosomal locus whose promoter drives an oncogenic fusion, establishing the gene's genomic identity and transcriptional behavior.","evidence":"Translocation mapping, RT-PCR, cDNA cloning and FISH in MDA-MB-175 breast cancer cells","pmids":["10523851","10597312"],"confidence":"High","gaps":["Does not address the native function of TENM4 protein","Fusion places NRG1 under DOC4 promoter rather than reflecting TENM4 activity"]},{"year":2004,"claim":"Genetic loss-of-function in mouse established that the TENM4 ortholog is essential for anterior-posterior axis formation and mesoderm-derived tissues, defining its first in vivo developmental requirement.","evidence":"ENU mutagenesis allelic series with phenotypic analysis and complementation tests in mouse embryos","pmids":["15489520"],"confidence":"Medium","gaps":["Molecular mechanism of patterning not resolved","No partner or signaling pathway identified at this stage"]},{"year":2013,"claim":"Mechanistic dissection of the gastrulation defect placed TENM4 upstream of Wnt signaling and epithelial-to-mesenchymal transition, explaining the mesoderm-induction failure.","evidence":"Loss-of-function mouse genetics with TOPGAL reporter, GSK3β inhibitor rescue, teratoma and cadherin immunostaining assays","pmids":["23521771"],"confidence":"Medium","gaps":["How TENM4 couples to Wnt pathway activation is undefined","Direct molecular link to GSK3β not established"]},{"year":2015,"claim":"Functional testing of patient mutations established a dominant-negative mode of action and connected TENM4 to a human disease.","evidence":"Oligodendrocyte precursor mislocalization assay and zebrafish mRNA injection with axon-guidance readout, plus exome sequencing","pmids":["26188006"],"confidence":"Medium","gaps":["Single lab","Endogenous interaction partners disrupted by mutants not identified"]},{"year":2023,"claim":"Knockout analysis revealed TENM4 normally suppresses EphB1 to limit ipsilateral retinal projections, defining a molecular target in axon-pathfinding control.","evidence":"Anterograde/retrograde tracing, EphB1 immunostaining and visual behavior assays in Ten-m4 knockout mice","pmids":["37092850"],"confidence":"Medium","gaps":["Mechanism by which TENM4 represses EphB1 unknown","Direct vs. indirect regulation not distinguished"]},{"year":2024,"claim":"An inducible intracellular-domain gain-of-function placed the TENM4 ICD upstream of sinoatrial node gene programs, expanding its signaling role beyond adhesion.","evidence":"Tet-Off Odz4-ICD expression in embryoid bodies with electrophysiology, in situ hybridization and CellChat analysis","pmids":["39462648"],"confidence":"Medium","gaps":["Physiological relevance of ICD signaling in vivo not shown","Mechanism linking ICD to Ptn-Ncl signaling unresolved"]},{"year":2025,"claim":"Structural and isoform analyses resolved how TENM4 chooses between adhesive modes and how transcript balance controls myelination, defining the protein's core mechanistic logic.","evidence":"Cryo-EM with transferable surface mutagenesis and in vivo cortical migration assays (preprint); minigene splicing, ΔE10 mouse model and OPC differentiation cultures","pmids":["bio_10.1101_2025.09.09.671438","41449293"],"confidence":"Medium","gaps":["Cryo-EM data on Ten2 transferred to Ten4 by mutation conservation, not direct Ten4 structure","Downstream effectors of the homophilic/heterophilic switch not defined","How isoform ratio is regulated during OPC differentiation unknown"]},{"year":2024,"claim":"Conditional deletion and acute disassembly established TENM4 as a direct extracellular mechanotransduction tether, a distinct biophysical role.","evidence":"Sensory neuron-specific conditional knockout, acute proteolytic TENM4 disassembly, touch behavior and electron-microscopy localization (preprint)","pmids":["bio_10.1101_2024.10.10.617546"],"confidence":"Medium","gaps":["Identity of the gated ion channel(s) not established","Molecular link between the laminin tether and channel activation undefined","Preprint, single lab"]},{"year":null,"claim":"How a single adhesion protein integrates mechanosensation, migration-mode switching, isoform-balanced myelination, Wnt-dependent patterning, and EphB1 suppression into a unified molecular logic remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying downstream signaling pathway identified across contexts","Direct intracellular effectors of the cytoplasmic domain largely uncharacterized","Relationship between adhesive and signaling functions unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[9]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[10]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[10]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[9,10]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[10]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[1,2,9]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,5]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[5,9,10]}],"complexes":[],"partners":["ADGRL1","EPHB1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6N022","full_name":"Teneurin-4","aliases":["Protein Odd Oz/ten-m homolog 4","Tenascin-M4","Ten-m4","Teneurin transmembrane protein 4"],"length_aa":2769,"mass_kda":308.0,"function":"Involved in neural development, regulating the establishment of proper connectivity within the nervous system. Plays a role in the establishment of the anterior-posterior axis during gastrulation. Regulates the differentiation and cellular process formation of oligodendrocytes and myelination of small-diameter axons in the central nervous system (CNS) (PubMed:26188006). Promotes activation of focal adhesion kinase. May function as a cellular signal transducer (By similarity)","subcellular_location":"Cell membrane; Cell projection; Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q6N022/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TENM4","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TENM4","total_profiled":1310},"omim":[{"mim_id":"616736","title":"TREMOR, HEREDITARY ESSENTIAL, 5; ETM5","url":"https://www.omim.org/entry/616736"},{"mim_id":"616417","title":"ADHESION G PROTEIN-COUPLED RECEPTOR L3; ADGRL3","url":"https://www.omim.org/entry/616417"},{"mim_id":"616416","title":"ADHESION G PROTEIN-COUPLED RECEPTOR L1; ADGRL1","url":"https://www.omim.org/entry/616416"},{"mim_id":"610119","title":"TENEURIN TRANSMEMBRANE PROTEIN 2; TENM2","url":"https://www.omim.org/entry/610119"},{"mim_id":"610084","title":"TENEURIN TRANSMEMBRANE PROTEIN 4; TENM4","url":"https://www.omim.org/entry/610084"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"ovary","ntpm":14.8},{"tissue":"parathyroid gland","ntpm":13.1}],"url":"https://www.proteinatlas.org/search/TENM4"},"hgnc":{"alias_symbol":["KIAA1302","Ten-M4","TEN4","DOC4"],"prev_symbol":["ODZ4"]},"alphafold":{"accession":"Q6N022","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6N022","model_url":"","pae_url":"","plddt_mean":null},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TENM4","jax_strain_url":"https://www.jax.org/strain/search?query=TENM4"},"sequence":{"accession":"Q6N022","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6N022.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6N022/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6N022"}},"corpus_meta":[{"pmid":"21926972","id":"PMC_21926972","title":"Large-scale genome-wide association analysis of bipolar disorder identifies a new susceptibility locus near ODZ4.","date":"2011","source":"Nature 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development","url":"https://pubmed.ncbi.nlm.nih.gov/10495292","citation_count":37,"is_preprint":false},{"pmid":"15489520","id":"PMC_15489520","title":"Mutation of l7Rn3 shows that Odz4 is required for mouse gastrulation.","date":"2004","source":"Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/15489520","citation_count":32,"is_preprint":false},{"pmid":"10597312","id":"PMC_10597312","title":"Gamma-heregulin: a fusion gene of DOC-4 and neuregulin-1 derived from a chromosome translocation.","date":"1999","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/10597312","citation_count":29,"is_preprint":false},{"pmid":"30745909","id":"PMC_30745909","title":"Exome Sequencing Identifies TENM4 as a Novel Candidate Gene for Schizophrenia in the SCZD2 Locus at 11q14-21.","date":"2019","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/30745909","citation_count":23,"is_preprint":false},{"pmid":"23521771","id":"PMC_23521771","title":"Mouse Tenm4 is required for mesoderm induction.","date":"2013","source":"BMC developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/23521771","citation_count":22,"is_preprint":false},{"pmid":"34568788","id":"PMC_34568788","title":"Genetic and functional analysis reveals TENM4 contributes to schizophrenia.","date":"2021","source":"iScience","url":"https://pubmed.ncbi.nlm.nih.gov/34568788","citation_count":21,"is_preprint":false},{"pmid":"22562803","id":"PMC_22562803","title":"Calcitonin receptor and Odz4 are differently expressed in Pax7-positive cells during skeletal muscle regeneration.","date":"2012","source":"Journal of molecular histology","url":"https://pubmed.ncbi.nlm.nih.gov/22562803","citation_count":14,"is_preprint":false},{"pmid":"33672732","id":"PMC_33672732","title":"Identification of TENM4 as a Novel Cancer Stem Cell-Associated Molecule and Potential Target in Triple Negative Breast 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with essential tremor caused by the P421L variant of the TENM4 gene in China.","date":"2023","source":"Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology","url":"https://pubmed.ncbi.nlm.nih.gov/36689009","citation_count":3,"is_preprint":false},{"pmid":"37092850","id":"PMC_37092850","title":"Ten-m4 plays a unique role in the establishment of binocular visual circuits.","date":"2023","source":"Developmental neurobiology","url":"https://pubmed.ncbi.nlm.nih.gov/37092850","citation_count":3,"is_preprint":false},{"pmid":"39462648","id":"PMC_39462648","title":"Odz4 upregulates SAN-specific genes to promote differentiation into cardiac pacemaker-like cells.","date":"2024","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/39462648","citation_count":0,"is_preprint":false},{"pmid":"41449293","id":"PMC_41449293","title":"Transcript Imbalance from TENM4 Exon Skipping: Effects on Epilepsy and Genetic 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essential tremor.\",\n      \"method\": \"In vitro mislocalization assay in oligodendrocyte precursor cells; zebrafish mRNA injection with axon guidance phenotype readout; whole-exome sequencing and segregation analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal functional methods (cell-based mislocalization assay + in vivo zebrafish dominant-negative), single lab\",\n      \"pmids\": [\"26188006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Mouse Odz4 (TENM4 ortholog) is required for establishing the anterior-posterior axis during gastrulation; a loss-of-function allele with a nonconservative amino acid change (conserved to Drosophila) disrupts mesoderm-derived tissues including somites, heart, and skeleton, demonstrating an essential role in embryonic patterning.\",\n      \"method\": \"ENU mutagenesis allelic series; RT-PCR sequencing of mutant alleles; phenotypic analysis of mouse embryos; intragenic complementation tests\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function with multiple alleles and defined phenotypic readouts, single lab\",\n      \"pmids\": [\"15489520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Mouse Tenm4 is required for mesoderm induction: loss-of-function Tenm4 mutant embryos fail to form a primitive streak and embryonic mesoderm. Wnt signaling (assessed by TOPGAL reporter) is absent in mutants, GSK3β inhibitor partially rescues the phenotype and restores TOPGAL expression. Epiblast cells remain pluripotent (Pou5f1+) but cannot differentiate in a cell-autonomous manner; misexpression of E-cadherin and N-cadherin suggests failure of epithelial-to-mesenchymal transition.\",\n      \"method\": \"Loss-of-function mouse genetics; TOPGAL Wnt reporter assay; GSK3β inhibitor rescue; teratoma assay; immunostaining for E-cadherin and N-cadherin; marker gene expression analysis\",\n      \"journal\": \"BMC developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (reporter assay, pharmacological rescue, cell-autonomous differentiation assay), single lab\",\n      \"pmids\": [\"23521771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"DOC4 (an alias of TENM4) is the 5' fusion partner in a chromosomal translocation in MDA-MB-175 breast cancer cells: the dic(8;11) translocation fuses the DOC4 gene (11q13) to the neuregulin-1/HGL gene (8p12), placing expression of the resulting gamma-heregulin fusion protein under the DOC4 promoter. Gamma-heregulin is thus a fusion oncogene product, not a native NRG1 isoform.\",\n      \"method\": \"Chromosomal translocation mapping; RT-PCR; cDNA cloning and sequencing; fluorescence in situ hybridization\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — independently confirmed by two groups (PMID 10523851 and PMID 10597312) using complementary molecular methods\",\n      \"pmids\": [\"10523851\", \"10597312\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Odz4/Ten-m4 protein is expressed in quiescent satellite cells but not in activated/proliferating myoblasts, establishing a role for TENM4 in marking the quiescent state of muscle stem cells; its reappearance during regeneration follows a distinct temporal pattern compared to the calcitonin receptor.\",\n      \"method\": \"Protein-level immunodetection in satellite cells during muscle regeneration; comparison with calcitonin receptor expression timing\",\n      \"journal\": \"Journal of molecular histology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single method (immunostaining/protein detection), functional consequence not directly tested\",\n      \"pmids\": [\"22562803\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Ten-m4 knockout mice show a specific increase in ipsilateral retinal ganglion cell projections to the dLGN and superior colliculus, particularly from the temporal retina. EphB1 expression in temporal retina is enhanced in KO mice, suggesting TENM4 normally suppresses EphB1-mediated ipsilateral retention at the optic chiasm. This altered projection is associated with changes in responses to ethologically relevant visual stimuli.\",\n      \"method\": \"Anterograde and retrograde tracing in Ten-m4 knockout mice; EphB1 immunostaining; behavioral visual response assay\",\n      \"journal\": \"Developmental neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with defined neuroanatomical and molecular phenotype using multiple orthogonal methods, single lab\",\n      \"pmids\": [\"37092850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TENM4 exon 10 skipping (ΔE10), caused by a splice-site variant, impairs oligodendrocyte differentiation and produces a smaller corpus callosum in mice. Homozygous Tenm4ΔE10/ΔE10 mice show increased seizure susceptibility. During oligodendrocyte progenitor cell differentiation, total Tenm4 transcripts increase markedly and the ratio of full-length to ΔE10 isoform is maintained; an imbalance in this ratio impairs oligodendrocyte development, establishing an isoform-balance mechanism for TENM4 in myelination.\",\n      \"method\": \"Minigene splicing assay; Tenm4ΔE10 mouse model generation; pentylenetetrazole seizure susceptibility test; corpus callosum morphometry; oligodendrocyte differentiation culture assay; RT-PCR transcript quantification\",\n      \"journal\": \"Molecular neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (mouse model, in vitro OPC differentiation, seizure assay, isoform quantification), single lab\",\n      \"pmids\": [\"41449293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Odz4 intracellular domain (ICD) overexpression in embryoid bodies promotes differentiation into pacemaker-like cells with enhanced automaticity and upregulated SAN-specific genes. CellChat analysis revealed SAN-specific enrichment of Ptn-Ncl ligand-receptor signaling, placing Odz4-ICD upstream of sinoatrial node gene programs.\",\n      \"method\": \"Tet-Off inducible Odz4-ICD expression in embryoid bodies; in situ hybridization; electrophysiology (automaticity); gene expression analysis; CellChat and GO analyses\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function with defined electrophysiological and molecular readouts, single lab\",\n      \"pmids\": [\"39462648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TENM4 silencing in mammary cancer cells impairs tumorsphere-forming ability, migratory capacity, and FAK (Focal Adhesion Kinase) phosphorylation, indicating TENM4 functions upstream of FAK signaling in cancer stem cell maintenance and migration.\",\n      \"method\": \"siRNA knockdown; tumorsphere formation assay; migration assay; FAK phosphorylation western blot\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single knockdown approach with functional readouts but no pathway rescue or reconstitution\",\n      \"pmids\": [\"33672732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cryo-EM data of Ten2 shows that Latrophilin binding is sterically incompatible with Ten-dimerization, making homophilic and heterophilic interactions mutually exclusive. Surface mutations engineered to disrupt Ten2-Ten2 or Ten2-Latrophilin interactions are transferable to Ten4, indicating conserved binding mechanisms. In vivo, Ten4 is expressed along radial glial cell (RGC) fibers; migrating neurons switch from low to high Ten4 expression. In the cortical plate, Ten4-Ten4 homophilic interactions reduce RGC attachment, while in the intermediate zone, Ten4-Latrophilin interactions promote neuron-RGC association, demonstrating that Ten4 orchestrates cortical neuron migration by toggling between two exclusive binding modes.\",\n      \"method\": \"Single-particle cryo-EM; engineered surface mutagenesis; in vivo gene editing; super-resolution microscopy; proteomics\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structure with mutagenesis and in vivo validation, single lab, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.09.09.671438\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Sensory neuron-specific deletion of Tenm4 in mice causes profound touch insensitivity. Acute proteolytic disassembly of TENM4 at sensory endings rapidly abolishes mechanotransduction, confirming direct involvement in force transduction. Ultrastructural analysis localizes TENM4 to filamentous structures at the neurite-laminin interface, identifying it as a structural extracellular tether that couples extracellular mechanical forces to ion channel activation in mechanoreceptors.\",\n      \"method\": \"Conditional (sensory neuron-specific) Tenm4 knockout mice; acute protease-mediated TENM4 disassembly; behavioral touch sensitivity assay; ultrastructural/electron microscopy localization\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO plus acute reversible loss-of-function with ultrastructural localization, single lab, preprint\",\n      \"pmids\": [\"bio_10.1101_2024.10.10.617546\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"TENM4 (teneurin-4) is a transmembrane cell-adhesion protein that functions in multiple contexts: it acts as an extracellular mechanosensory tether at neurite-laminin interfaces to gate touch-sensitive ion channels; it orchestrates cortical neuron migration by switching between mutually exclusive homophilic (Ten4-Ten4) and heterophilic (Ten4-Latrophilin) interactions; it regulates oligodendrocyte differentiation and central myelination through isoform-balance of full-length vs. exon-10-skipped transcripts; it is required for Wnt-dependent mesoderm induction and gastrulation in mice; and it shapes ipsilateral retinal projections by suppressing EphB1 expression, with disease-linked missense mutations causing dominant-negative protein mislocalization in oligodendrocyte precursor cells and axon guidance defects in zebrafish.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TENM4 (teneurin-4) is a transmembrane cell-adhesion protein that governs cell positioning and differentiation across neural, developmental, and stem-cell contexts [#9, #1]. In the developing cortex it orchestrates radial neuron migration by toggling between two mutually exclusive adhesive modes — homophilic Ten4-Ten4 binding and heterophilic Ten4-Latrophilin binding — that are sterically incompatible at the structural level, so that homophilic interactions reduce attachment to radial glia in the cortical plate while heterophilic interactions promote neuron-glia association in the intermediate zone [#9]. At sensory nerve endings TENM4 forms filamentous extracellular tethers at the neurite-laminin interface and couples mechanical force to ion-channel activation, such that its deletion or acute proteolytic disassembly abolishes touch mechanotransduction [#10]. In the visual system it shapes ipsilateral retinal projections by suppressing EphB1 expression in temporal retina [#5], and in the oligodendrocyte lineage it controls differentiation and central myelination through the balance of full-length versus exon-10-skipped (ΔE10) isoforms [#6]. During early development TENM4 is required for Wnt-dependent mesoderm induction and gastrulation: loss-of-function embryos fail to form a primitive streak, lack TOPGAL Wnt reporter activity that is partially restored by GSK3β inhibition, and cannot undergo epithelial-to-mesenchymal transition [#2, #1]. Patient missense mutations act through a dominant-negative mechanism, causing mutant protein mislocalization in oligodendrocyte precursor cells and axon-guidance defects in zebrafish, linking TENM4 to essential tremor [#0].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Before its developmental roles were known, TENM4 (DOC4) was identified as a chromosomal locus whose promoter drives an oncogenic fusion, establishing the gene's genomic identity and transcriptional behavior.\",\n      \"evidence\": \"Translocation mapping, RT-PCR, cDNA cloning and FISH in MDA-MB-175 breast cancer cells\",\n      \"pmids\": [\"10523851\", \"10597312\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not address the native function of TENM4 protein\", \"Fusion places NRG1 under DOC4 promoter rather than reflecting TENM4 activity\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Genetic loss-of-function in mouse established that the TENM4 ortholog is essential for anterior-posterior axis formation and mesoderm-derived tissues, defining its first in vivo developmental requirement.\",\n      \"evidence\": \"ENU mutagenesis allelic series with phenotypic analysis and complementation tests in mouse embryos\",\n      \"pmids\": [\"15489520\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism of patterning not resolved\", \"No partner or signaling pathway identified at this stage\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Mechanistic dissection of the gastrulation defect placed TENM4 upstream of Wnt signaling and epithelial-to-mesenchymal transition, explaining the mesoderm-induction failure.\",\n      \"evidence\": \"Loss-of-function mouse genetics with TOPGAL reporter, GSK3β inhibitor rescue, teratoma and cadherin immunostaining assays\",\n      \"pmids\": [\"23521771\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How TENM4 couples to Wnt pathway activation is undefined\", \"Direct molecular link to GSK3β not established\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Functional testing of patient mutations established a dominant-negative mode of action and connected TENM4 to a human disease.\",\n      \"evidence\": \"Oligodendrocyte precursor mislocalization assay and zebrafish mRNA injection with axon-guidance readout, plus exome sequencing\",\n      \"pmids\": [\"26188006\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Endogenous interaction partners disrupted by mutants not identified\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Knockout analysis revealed TENM4 normally suppresses EphB1 to limit ipsilateral retinal projections, defining a molecular target in axon-pathfinding control.\",\n      \"evidence\": \"Anterograde/retrograde tracing, EphB1 immunostaining and visual behavior assays in Ten-m4 knockout mice\",\n      \"pmids\": [\"37092850\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which TENM4 represses EphB1 unknown\", \"Direct vs. indirect regulation not distinguished\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"An inducible intracellular-domain gain-of-function placed the TENM4 ICD upstream of sinoatrial node gene programs, expanding its signaling role beyond adhesion.\",\n      \"evidence\": \"Tet-Off Odz4-ICD expression in embryoid bodies with electrophysiology, in situ hybridization and CellChat analysis\",\n      \"pmids\": [\"39462648\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological relevance of ICD signaling in vivo not shown\", \"Mechanism linking ICD to Ptn-Ncl signaling unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Structural and isoform analyses resolved how TENM4 chooses between adhesive modes and how transcript balance controls myelination, defining the protein's core mechanistic logic.\",\n      \"evidence\": \"Cryo-EM with transferable surface mutagenesis and in vivo cortical migration assays (preprint); minigene splicing, ΔE10 mouse model and OPC differentiation cultures\",\n      \"pmids\": [\"bio_10.1101_2025.09.09.671438\", \"41449293\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cryo-EM data on Ten2 transferred to Ten4 by mutation conservation, not direct Ten4 structure\", \"Downstream effectors of the homophilic/heterophilic switch not defined\", \"How isoform ratio is regulated during OPC differentiation unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Conditional deletion and acute disassembly established TENM4 as a direct extracellular mechanotransduction tether, a distinct biophysical role.\",\n      \"evidence\": \"Sensory neuron-specific conditional knockout, acute proteolytic TENM4 disassembly, touch behavior and electron-microscopy localization (preprint)\",\n      \"pmids\": [\"bio_10.1101_2024.10.10.617546\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the gated ion channel(s) not established\", \"Molecular link between the laminin tether and channel activation undefined\", \"Preprint, single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single adhesion protein integrates mechanosensation, migration-mode switching, isoform-balanced myelination, Wnt-dependent patterning, and EphB1 suppression into a unified molecular logic remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying downstream signaling pathway identified across contexts\", \"Direct intracellular effectors of the cytoplasmic domain largely uncharacterized\", \"Relationship between adhesive and signaling functions unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [9, 10]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 2, 9]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 5]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [5, 9, 10]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ADGRL1\", \"EphB1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}