{"gene":"CADM1","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":2005,"finding":"SynCAM 1 (CADM1) expressed in non-neuronal cells specifically induces presynaptic differentiation in co-cultured neurons, forming artificial synapses capable of both spontaneous and evoked neurotransmitter release; the dominant-positive effect on synaptic function in developing neurons is mediated by its intracellular cytoplasmic tail.","method":"Co-culture synapse induction assay, electrophysiology (mEPSC recording), chimeric molecule analysis","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1–2 — functional reconstitution in co-culture with mechanistic dissection via chimeric constructs; replicated across multiple measures","pmids":["15634790"],"is_preprint":false},{"year":2010,"finding":"SynCAM 1 (CADM1) overexpression in transgenic mice increases excitatory synapse number, while knockout reduces excitatory synapses; SynCAM 1 also regulates long-term depression and spatial learning, demonstrating it maintains synapses and modulates plasticity in vivo.","method":"Transgenic overexpression and knockout mouse models, electrophysiology, behavioral testing (spatial learning)","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 — reciprocal gain/loss-of-function in vivo with multiple orthogonal phenotypic readouts","pmids":["21145003"],"is_preprint":false},{"year":2010,"finding":"SynCAM 1 (CADM1) is a target for polysialylation in postnatal mouse brain; both polysialyltransferases ST8SiaII and ST8SiaIV polysialylate SynCAM 1 in vitro on N-glycans of the first Ig domain, and polysialylation completely abolishes homophilic SynCAM 1 binding.","method":"Affinity purification, peptide mass fingerprinting (glycoproteomics), in vitro polysialylation assay, homophilic binding assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — in vitro enzymatic assay with functional (binding) readout, replicated across ST8SiaII and ST8SiaIV","pmids":["20479255"],"is_preprint":false},{"year":2010,"finding":"SynCAM 1 (CADM1) localizes to neuronal growth cones and, upon contact with target neurites, rapidly assembles into stable adhesive clusters; SynCAM 1 restricts filopodial number and growth cone morphological complexity; focal adhesion kinase (FAK) is a binding partner implicated in these morphogenetic activities.","method":"Live imaging, immunofluorescence localization, siRNA knockdown and overexpression in neurons, FAK co-immunoprecipitation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — direct localization tied to functional consequence, with KD/OE and binding partner identification","pmids":["20368431"],"is_preprint":false},{"year":2011,"finding":"SynCAM 1 (CADM1) self-assembles laterally (cis oligomerization) via its extracellular membrane-proximal Ig domains 2 and 3; this cis oligomerization generates SynCAM oligomers with increased adhesive capacity, promotes adhesive clustering at new axo-dendritic contacts, is required for synaptogenic activity, and restricts synaptic size at mature synapses.","method":"Biochemical oligomerization assays, mutagenesis of Ig domains, immunofluorescence in differentiating neurons, synapse induction assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 — biochemical reconstitution with domain mutagenesis plus functional synaptogenesis assay","pmids":["21926970"],"is_preprint":false},{"year":2010,"finding":"Site-specific N-glycosylation differentially modulates SynCAM adhesion: N-glycan on SynCAM 2 Asn60 reduces adhesion, while N-glycans on SynCAM 1 Asn70/Asn104 (which flank the Ig1 binding interface) increase interactions; sialylation of SynCAM 1 contributes to glycan-dependent strengthening; N-glycosylation promotes trans-synaptic SynCAM 1 interactions and is required for synapse induction.","method":"X-ray crystallography (SynCAM 2 Ig1 domain), mass spectrometry, site-directed mutagenesis, adhesion assay, synapse induction assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structure plus mutagenesis plus functional assay in single study","pmids":["20739279"],"is_preprint":false},{"year":2009,"finding":"CADM1 associates with actin-binding protein 4.1B/DAL-1 and scaffold proteins MPP1/p55, MPP2/DLG2, and MPP3/DLG3, forming a tripartite complex; MPP2 is recruited to the CADM1-4.1B complex during early adhesion; siRNA knockdown of CADM1 in HEK293 cells causes loss of epithelial-like structure, flat morphology, and mislocalization of 4.1B, MPP2, E-cadherin, and ZO-1 from the membrane.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 — multiple binding partners confirmed by co-IP plus loss-of-function with defined structural phenotype","pmids":["19854157"],"is_preprint":false},{"year":2014,"finding":"Trans-homophilic interaction of CADM1 activates PI3K signaling; MPP3 and Dlg (MAGuK-family proteins) connect CADM1 with the p85 subunit of PI3K forming a multi-protein complex at the cell periphery; PI3K inhibition suppresses CADM1-mediated cell spreading, and downstream Akt and Rac1 partially mediate this effect on actin cytoskeleton reorganization and epithelial structure formation.","method":"Cell-based spreading assay on recombinant CADM1-coated substrate, chemical inhibitor screen (104 inhibitors), co-immunoprecipitation of CADM1/MPP3/Dlg/p85 complex","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — cell-based reconstitution assay with inhibitor screen and co-IP of complex; multiple orthogonal approaches","pmids":["24503895"],"is_preprint":false},{"year":2015,"finding":"HTLV-1 Tax requires membrane-associated CADM1 as a scaffold: CADM1 recruits Ubc13 to Tax causing K63-linked polyubiquitination of Tax and IKK complex activation in plasma membrane lipid rafts; the PDZ-binding motif in CADM1's cytoplasmic tail is critical; in the absence of CADM1, Tax fails to inactivate the A20 ubiquitin-editing enzyme complex and cannot activate IKK, abolishing persistent NF-κB signaling.","method":"Co-immunoprecipitation, ubiquitination assays, lipid raft fractionation, CADM1 knockdown/knockout, PDZ-motif deletion mutants","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 — mechanistic complex reconstitution with domain mutants and KO, multiple orthogonal methods","pmids":["25774694"],"is_preprint":false},{"year":2018,"finding":"KSHV oncoproteins vFLIP and vGPCR interact with CADM1; the PDZ-binding motif at the C-terminus of CADM1 is essential for both vGPCR- and vFLIP-mediated chronic NF-κB activation; lipid raft-associated CADM1 interaction with vFLIP is critical for IKK complex initiation; CADM1 is required for survival of KSHV-associated PEL cells.","method":"Co-immunoprecipitation, lipid raft fractionation, CADM1 knockdown, PDZ-motif deletion analysis, cell viability assays","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 — mechanistic co-IP with domain mutants, parallels HTLV-1 Tax findings; multiple orthogonal methods","pmids":["29698475"],"is_preprint":false},{"year":2016,"finding":"CADM1 inhibits squamous cell carcinoma proliferation and invasion by forming a cell-surface complex with HER2 and integrin α6β4 that disrupts downstream STAT3 activity; this requires the extracellular domain of CADM1; JAK/STAT inhibition mimics CADM1 restoration in preventing SqCC growth and metastasis.","method":"Gene transduction, co-immunoprecipitation (CADM1/HER2/integrin α6β4 complex), xenograft tumor assay, STAT3 phosphorylation assays","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — complex identified by co-IP, domain requirement established, in vivo xenograft validation","pmids":["27035095"],"is_preprint":false},{"year":2006,"finding":"Knockout of RA175/CADM1 in male mice causes infertility due to failure of elongating spermatids (steps 9–12) to mature and translocate to the adluminal surface; CADM1 is expressed at cell junctions of spermatocytes and elongating spermatids and is required for retaining them in Sertoli cell invaginations.","method":"Gene knockout mouse model, histological analysis of testis, immunofluorescence localization","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — complete KO with defined cellular phenotype and localization in same study","pmids":["16382161"],"is_preprint":false},{"year":2007,"finding":"Par-3 (a cell polarity protein with PDZ domains) binds the cytoplasmic region of RA175/CADM1 in testis; RA175 forms a ternary complex with JAM-C via Par-3 interaction; in RA175-knockout elongating spermatids, Par-3 is absent and JAM-C is absent or mislocalized, indicating that CADM1 organizes polarity machinery in spermatids.","method":"Co-immunoprecipitation (ternary complex), immunofluorescence in RA175-KO vs wildtype testis","journal":"The American journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP of ternary complex plus KO phenotype, single lab","pmids":["18055550"],"is_preprint":false},{"year":2008,"finding":"Two missense mutations in CADM1 (H246N and Y251S) located in the third Ig domain, identified in ASD patients, result in reduced high-molecular-weight (mature oligosaccharide-containing) forms, defective trafficking to the cell surface, and increased susceptibility to cleavage/degradation; the third Ig domain is essential for trans-active interaction.","method":"Patient mutation identification, Western blot (glycoform analysis), cell surface biotinylation, degradation assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — functional characterization of disease mutations with multiple biochemical readouts, single lab","pmids":["18957284"],"is_preprint":false},{"year":2012,"finding":"CADM1-mediated homophilic adhesion of mast cells to neurons is required for mast cell degranulation and IL-6 secretion enhancement; knockdown of CADM1 in bone marrow-derived mast cells or application of a CADM1 blocking peptide significantly decreased BMMC attachment to sensory neurites and abolished enhanced secretory responses.","method":"CADM1 siRNA knockdown, blocking peptide, BMMC-DRG neuron co-culture, β-hexosaminidase degranulation assay, cytokine ELISA","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — KD with defined functional phenotype in co-culture model, single lab","pmids":["31275114"],"is_preprint":false},{"year":2012,"finding":"On mast cells, CADM1 promotes attachment to dorsal root ganglion (DRG) neurites through heterophilic binding to nectin-3 expressed on DRG neurons; neutralizing antibody to nectin-3 inhibits both mast cell attachment and subsequent calcium responses, despite low CADM1 expression on DRG.","method":"Adhesion assay, neutralizing antibody blocking, calcium imaging, immunofluorescence of nectin-3 at cell-cell contacts","journal":"Journal of neuroimmunology","confidence":"Medium","confidence_rationale":"Tier 3 — functional blocking antibody identifies heterophilic ligand, single lab","pmids":["22703826"],"is_preprint":false},{"year":2014,"finding":"CADM1 controls actin cytoskeleton assembly in human mast cells; downregulation of CADM1 in HMC-1 cells reduces surface KIT levels, alters cortical F-actin polymerization, elongates cortical actin filaments, increases cell rigidity, and reduces ECM adhesion indirectly through regulation of integrin function.","method":"siRNA knockdown, flow cytometry (surface KIT), confocal microscopy (F-actin), atomic force microscopy (cell rigidity), adhesion assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — KD with multiple orthogonal readouts, single lab","pmids":["24465823"],"is_preprint":false},{"year":2012,"finding":"CADM1 polysialylation in mouse brain is exclusively mediated by ST8SiaII in vivo (not ST8SiaIV); polysialylation requires both Ig1 (which contains the glycosylation site) and Ig2 (which serves as a docking site for ST8SiaII), as Ig1 alone is insufficient as an acceptor.","method":"ST8SiaII and ST8SiaIV single knockout mouse analysis, domain-deletion constructs, in vitro polysialylation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro enzymatic assay with domain deletions and in vivo KO validation; replicates and extends prior polysialylation finding","pmids":["22908220"],"is_preprint":false},{"year":2013,"finding":"CADM1 (Necl-2) interacts with ErbB4 receptor tyrosine kinase in parvalbumin-positive GABAergic neurons; Necl-2 knockdown enhances Nrg1-induced ErbB4 phosphorylation; overexpression of PTPN13 (a tyrosine phosphatase bound to the cytoplasmic tail of Necl-2) suppresses Nrg1-induced excitatory synapse development in GABAergic neurons through inhibition of ErbB4 activity.","method":"Co-immunoprecipitation (Necl-2/ErbB4), siRNA knockdown, PTPN13 overexpression, phospho-ErbB4 assay, synapse morphology analysis","journal":"Molecular and cellular neurosciences","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP with functional KD/OE and defined downstream signaling readout, single lab","pmids":["23769722"],"is_preprint":false},{"year":2019,"finding":"TWIST1 transcription factor directly binds the CADM1 promoter (shown by ChIP and promoter assays) to repress CADM1 expression; restored CADM1 expression inhibits melanoma cell motility and invasion, and induces caspase-independent cell death in non-adherent conditions associated with loss of mitochondrial membrane potential.","method":"Chromatin immunoprecipitation (ChIP), promoter reporter assay, CADM1 overexpression, migration/invasion assay, apoptosis assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — direct promoter binding confirmed by ChIP plus functional rescue, single lab","pmids":["30911007"],"is_preprint":false},{"year":2016,"finding":"CADM1 regulates G1/S cell cycle transition in hepatocellular carcinoma; ectopic CADM1 expression increases Retinoblastoma (Rb) protein levels, inhibits cell growth, and suppresses tumorigenicity in vitro and in vivo, implicating the Rb-E2F pathway in CADM1-mediated tumor suppression.","method":"Cell cycle analysis, EdU incorporation, colony formation assay, in vivo xenograft, Western blot (Rb protein levels)","journal":"Hepatobiliary & pancreatic diseases international","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro and in vivo functional assays with defined signaling pathway readout, single lab","pmids":["27298105"],"is_preprint":false},{"year":2017,"finding":"CADM1 ectodomain shedding susceptibility is determined by alternative splicing and O-glycosylation: a 33-bp alternative exon inserts five non-glycosylatable amino acids between O-glycans (which normally block ADAM-family metalloprotease access) and the cleavage site, conferring shedding susceptibility; O-glycans adjacent to the cleavage site thus interfere with shedding.","method":"Shedding assays with CADM1 splicing variants, O-glycosylation mutants, ADAM metalloprotease inhibitors","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 — mechanistic dissection with domain/glycosylation mutants and reconstituted shedding assay","pmids":["28393893"],"is_preprint":false},{"year":2019,"finding":"SynCAM 1/CADM1 acts cell-autonomously in parvalbumin-positive (PV+) interneurons to regulate thalamocortical synapse number onto PV+ cells and restrict cortical plasticity; selective knockdown of SynCAM 1 in adult PV+ interneurons restores juvenile-like plasticity in visual cortex, and SynCAM 1 loss reduces thalamocortical inputs onto PV+ cells impairing feedforward inhibition maturation.","method":"Conditional and cell-type-specific SynCAM 1 KO/knockdown, monocular deprivation plasticity assay, immunofluorescence synapse counting","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — cell-autonomous cell-type-specific KD with defined synaptic and plasticity phenotype","pmids":["30625321"],"is_preprint":false},{"year":2016,"finding":"SynCAM 1 (CADM1) loss reduces excitatory mossy fiber inputs onto parvalbumin-positive interneurons in hippocampal CA3, decreases postsynaptic GluA1 expression in these interneurons, and causes CA3 disinhibition; SynCAM 1 KO also reduces excitatory synapse number in nucleus accumbens and impairs mossy fiber refinement in CA3.","method":"SynCAM 1 knockout mice, DTI-MRI, electrophysiology (feedforward inhibition), immunofluorescence synapse counting, Western blot (GluA1)","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — KO with multiple orthogonal circuit-level and molecular readouts","pmids":["27413156"],"is_preprint":false},{"year":2023,"finding":"Somatic gain-of-function CADM1 mutations (p.Val380Asp, p.Gly379Asp) in aldosterone-producing adenomas cause reversible hypertension; these intramembranous mutations markedly upregulate CYP11B2 (aldosterone synthase) 10–25-fold; CADM1 mutation or knockdown inhibits gap junction-permeable dye transfer, and gap junction blockade by Gap27 increases CYP11B2 similarly to CADM1 mutation, revealing that CADM1 normally suppresses aldosterone production via gap junction communication.","method":"Whole exome sequencing, H295R cell transduction with mutant CADM1, gene expression profiling, gap junction dye transfer assay, Gap27 pharmacological blockade, adrenalectomy cure in patients","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 1–2 — human somatic mutations functionally validated in cell model with mechanistic dissection (gap junction assay) and clinical cure; replicated in multiple patients","pmids":["37291193"],"is_preprint":false},{"year":2012,"finding":"CADM1 suppresses metastasis in a manner that requires the host's adaptive immune system; loss of CADM1 metastasis suppression is recapitulated by depletion of CD8+ T cells in immune-competent mice, indicating CADM1 sensitizes tumor cells to immune surveillance without affecting tumor-cell-autonomous proliferation or invasion.","method":"Genetic screen (complex cross), CADM1 KO mouse models, CD8+ T cell depletion, metastasis assay (lung colonization)","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis (CD8 depletion) defines pathway; single lab","pmids":["23028344"],"is_preprint":false},{"year":2016,"finding":"CADM1 regulates TNFα-induced migration of endothelial progenitor cells; TNFα activates NF-κB, which upregulates CADM1 expression; inhibition of NF-κB or CADM1 knockdown significantly decreases EPC migration and incorporation into vessel-like structures in vitro.","method":"siRNA knockdown, NF-κB inhibitor, migration/incorporation co-culture assay, genomic and proteomic approaches","journal":"Stem cells","confidence":"Medium","confidence_rationale":"Tier 2 — KD with functional migration phenotype plus pathway placement by NF-κB inhibitor, single lab","pmids":["26867147"],"is_preprint":false},{"year":2021,"finding":"CADM1 and CADM2 act in cis (on the same cell membrane as the viral protein, not in trans) with the measles virus attachment protein on neurons lacking canonical MeV receptors, triggering the fusion protein and enabling membrane fusion and transsynaptic MeV spread; knockdown of CADM1 and CADM2 inhibits syncytium formation and virus transmission between neurons.","method":"siRNA knockdown, cell fusion assays, expression of hyperfusogenic MeV F protein, co-immunoprecipitation of CADM1 with MeV H protein in cis","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 2 — mechanistic co-IP, KD with defined viral spread phenotype, novel receptor-mimicking cis mechanism characterized","pmids":["33910952"],"is_preprint":false},{"year":2016,"finding":"Extracellular CADM1 interactions in pancreatic β-cells constrain insulin secretion; CADM1 expression decreases after prolonged glucose stimulation; transcellular CADM1 interactions promote exocytic site assembly and actin network formation in β-cells, paralleling its role at CNS synapses.","method":"CADM1 overexpression and siRNA knockdown in INS-1 insulinoma cells and primary rat/human islet β-cells, insulin secretion assay, co-culture model, actin and syntaxin-1 imaging","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — KD/OE with secretion phenotype and subcellular imaging in primary cells plus cell line, single lab","pmids":["27072493"],"is_preprint":false},{"year":2012,"finding":"CADM1 isoforms differentially regulate human mast cell survival and homotypic adhesion; CADM1 is the sole receptor mediating mast cell aggregation (knockdown abolishes homotypic adhesion); CADM1 downregulation reduces viability and Mcl-1(L) expression, increasing caspase-3/7 activity; SP4 isoform augments homotypic adhesion more than SP1.","method":"siRNA knockdown (complete abolition of aggregation), isoform-specific overexpression, cell viability assay, caspase-3/7 activity, Western blot (Mcl-1)","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 — isoform-specific KD/OE with multiple survival and adhesion readouts, single lab","pmids":["22438059"],"is_preprint":false},{"year":2008,"finding":"SynCAM family members engage in specific heterophilic adhesion interactions: SynCAMs 1/2, 2/4, and 3/4 mediate the three prominent trans-interactions, as shown by cell overlay experiments using extracellular domains.","method":"Cell overlay adhesion experiments with SynCAM extracellular domain constructs, in situ hybridization, immunohistochemistry","journal":"The Journal of comparative neurology","confidence":"Medium","confidence_rationale":"Tier 3 — cell overlay binding assay defines heterophilic interaction network, single lab","pmids":["18615557"],"is_preprint":false},{"year":2010,"finding":"Cadm1 knockout mice exhibit impaired social interaction, increased anxiety-related behavior, and impaired motor coordination, demonstrating that CADM1-mediated synaptic adhesion is required for normal emotional, social, and motor behaviors.","method":"Cadm1 knockout mice, open-field test, light-dark transition test, social interaction/memory/recognition tests, rotarod, footprint analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — KO with multiple defined behavioral phenotypes, single lab","pmids":["20450890"],"is_preprint":false}],"current_model":"CADM1 (SynCAM 1) is a transmembrane immunoglobulin superfamily cell adhesion molecule that mediates Ca2+-independent homo- and heterophilic trans-adhesion via its extracellular Ig domains and lateral cis-oligomerization; its cytoplasmic PDZ-binding tail scaffolds complexes with 4.1B, MPP/MAGuK proteins, and PI3K to regulate epithelial polarity, actin cytoskeleton organization, and cell survival; at synapses it organizes excitatory synapse development, number, and plasticity (including feedforward inhibition by PV+ interneurons and critical-period closure); post-translational regulation by N-glycosylation, O-glycosylation-dependent ectodomain shedding, and polysialylation (exclusively via ST8SiaII) modulates its adhesive function; in HTLV-1- and KSHV-infected cells the PDZ tail acts as a scaffold for viral oncoproteins to sustain NF-κB activation; somatic gain-of-function intramembranous mutations cause aldosterone excess by disrupting gap junction communication; and it mediates mast cell adhesion to neurons/fibroblasts and mast cell survival through Mcl-1 regulation."},"narrative":{"teleology":[{"year":2005,"claim":"Whether a single adhesion molecule could instruct presynaptic assembly was unknown; demonstrating that CADM1 expressed in non-neuronal cells induces functional presynaptic terminals via its cytoplasmic tail established CADM1 as a synaptogenic organizer.","evidence":"Co-culture synapse induction assay with electrophysiology and chimeric constructs in neurons","pmids":["15634790"],"confidence":"High","gaps":["Identity of cytoplasmic binding partners mediating synaptogenic signaling not determined","Whether CADM1 is required (not just sufficient) for synapse formation in vivo was untested"]},{"year":2006,"claim":"Whether CADM1 adhesion serves non-neuronal tissue morphogenesis was unclear; knockout mice revealed CADM1 is essential for spermatid maturation and retention within Sertoli cell invaginations, broadening its role to germ cell–somatic cell adhesion.","evidence":"CADM1 knockout mouse with testicular histology and immunofluorescence","pmids":["16382161"],"confidence":"High","gaps":["Molecular partners at the spermatid–Sertoli junction were uncharacterized","Whether heterophilic ligands contribute to spermatid adhesion was unknown"]},{"year":2007,"claim":"How CADM1 organizes polarity in spermatids was unknown; identification of a Par-3-mediated ternary complex linking CADM1 to JAM-C, lost in knockout spermatids, established CADM1 as a polarity scaffold in male germ cells.","evidence":"Co-immunoprecipitation of CADM1/Par-3/JAM-C ternary complex, immunofluorescence in KO testis","pmids":["18055550"],"confidence":"Medium","gaps":["Single-lab co-IP without reciprocal validation from an independent group","Whether Par-3 interaction applies at neuronal synapses was untested"]},{"year":2008,"claim":"The heterophilic binding code of the SynCAM family was undefined; systematic cell overlay experiments mapped SynCAM 1/2, 2/4, and 3/4 as the dominant trans-heterophilic pairs, defining how SynCAM diversity generates contact specificity.","evidence":"Cell overlay adhesion assay using extracellular domain constructs, in situ hybridization","pmids":["18615557"],"confidence":"Medium","gaps":["Affinities not quantified","In vivo relevance of heterophilic pairs at specific synapses not demonstrated"]},{"year":2009,"claim":"How CADM1's cytoplasmic domain controls epithelial architecture was poorly understood; identification of the CADM1–4.1B–MPP2/MPP3 tripartite complex and demonstration that CADM1 knockdown causes loss of epithelial polarity markers established CADM1 as a membrane-proximal scaffold for polarity and junction organization.","evidence":"Co-immunoprecipitation of tripartite complex, siRNA knockdown in HEK293 cells with immunofluorescence","pmids":["19854157"],"confidence":"High","gaps":["Whether the tripartite complex operates identically at neuronal synapses was unknown","Structural basis of 4.1B–MPP2 recruitment not resolved"]},{"year":2010,"claim":"Three concurrent advances resolved how CADM1 functions in vivo and how glycosylation tunes its adhesion: transgenic/KO mice showed CADM1 maintains excitatory synapse number and modulates LTD and spatial learning; polysialylation on N-glycans of Ig1 was shown to abolish homophilic binding; and site-specific N-glycosylation was demonstrated to strengthen trans-synaptic interactions and be required for synapse induction.","evidence":"Transgenic overexpression/KO mice with electrophysiology and behavior; in vitro polysialylation and binding assays; crystal structure with mutagenesis and synapse induction assay","pmids":["21145003","20479255","20739279"],"confidence":"High","gaps":["Which polysialyltransferase acts on CADM1 in vivo was unresolved (both ST8SiaII and ST8SiaIV active in vitro)","Whether polysialylation regulates synapse number in vivo was untested"]},{"year":2010,"claim":"CADM1's role at growth cones was unknown; live imaging showed CADM1 rapidly clusters at nascent axo-dendritic contacts, restricts filopodial complexity, and associates with FAK, linking adhesion to growth cone morphogenesis.","evidence":"Live imaging, siRNA/overexpression in neurons, FAK co-immunoprecipitation","pmids":["20368431"],"confidence":"High","gaps":["Whether FAK is a direct or indirect CADM1 interactor was not resolved","Upstream signals triggering CADM1 clustering were undefined"]},{"year":2011,"claim":"Whether CADM1 acts as monomers or oligomers was unresolved; biochemical and mutagenesis studies showed cis-oligomerization through Ig2–Ig3 domains is required for adhesive clustering and synaptogenic activity, and restricts synaptic size at mature contacts.","evidence":"Biochemical oligomerization assays, domain mutagenesis, synapse induction in differentiating neurons","pmids":["21926970"],"confidence":"High","gaps":["Stoichiometry and structure of cis oligomers not determined","Relationship between cis-oligomerization and polysialylation regulation unclear"]},{"year":2012,"claim":"Multiple 2012 studies resolved isoform-specific functions and in vivo polysialylation: ST8SiaII was identified as the exclusive in vivo polysialyltransferase requiring both Ig1 and Ig2 domains; CADM1 isoforms were shown to differentially control mast cell survival (via Mcl-1) and homotypic adhesion; and CADM1 was identified as a metastasis suppressor dependent on host CD8⁺ T cell immunity.","evidence":"ST8SiaII/IV KO mice with in vitro polysialylation; mast cell isoform-specific KD/OE with caspase and adhesion assays; CADM1 KO with CD8 depletion epistasis in metastasis model","pmids":["22908220","22438059","23028344"],"confidence":"High","gaps":["How CADM1 loss evades CD8⁺ T cell recognition mechanistically was unknown","Whether mast cell isoform effects apply in vivo was not shown"]},{"year":2012,"claim":"How mast cells adhere to neurons was poorly defined; co-culture experiments showed CADM1-mediated homophilic adhesion drives mast cell–neuron attachment, degranulation, and IL-6 secretion, while heterophilic binding to nectin-3 on DRG neurons was identified as an additional trans-ligand.","evidence":"CADM1 siRNA and blocking peptide in BMMC–DRG co-culture; nectin-3 neutralizing antibody with calcium imaging","pmids":["31275114","22703826"],"confidence":"Medium","gaps":["Relative contributions of homophilic vs. nectin-3 heterophilic adhesion not quantified in vivo","Whether mast cell–neuron CADM1 adhesion is polysialylation-regulated was unknown"]},{"year":2013,"claim":"How CADM1 influences inhibitory circuit development was unclear; identification of CADM1–ErbB4 interaction in PV⁺ interneurons, with PTPN13 as a cytoplasmic phosphatase recruited to CADM1 that suppresses Nrg1/ErbB4-driven excitatory synapse formation, revealed CADM1 as a negative modulator of ErbB4 signaling in GABAergic neurons.","evidence":"Co-immunoprecipitation of CADM1–ErbB4, siRNA knockdown, PTPN13 overexpression, phospho-ErbB4 assay","pmids":["23769722"],"confidence":"Medium","gaps":["PTPN13 interaction with CADM1 not confirmed by reciprocal IP or structural data","In vivo relevance in PV⁺ interneuron development not demonstrated"]},{"year":2014,"claim":"The signaling pathway downstream of CADM1 trans-adhesion was undefined; reconstitution showed CADM1 activates PI3K through a CADM1–MPP3–Dlg–p85 complex, driving Akt/Rac1-dependent actin reorganization and epithelial spreading.","evidence":"Spreading assay on recombinant CADM1, chemical inhibitor screen, co-immunoprecipitation of quaternary complex","pmids":["24503895"],"confidence":"High","gaps":["Whether PI3K signaling mediates CADM1's synaptogenic activity was untested","Direct vs. bridged interaction between CADM1 and p85 not resolved"]},{"year":2015,"claim":"How viral oncoproteins hijack CADM1 was unknown; HTLV-1 Tax was shown to require CADM1's PDZ-binding tail to recruit Ubc13 for K63-linked polyubiquitination in lipid rafts, activating IKK and sustaining NF-κB signaling while inactivating A20.","evidence":"Co-IP, ubiquitination assays, lipid raft fractionation, CADM1 KO and PDZ-motif deletion mutants","pmids":["25774694"],"confidence":"High","gaps":["Whether CADM1 scaffolding of NF-κB occurs in non-infected cells was unknown","Structural basis of Tax–CADM1 interaction not resolved"]},{"year":2016,"claim":"Multiple 2016 discoveries broadened CADM1's circuit and signaling roles: in hippocampus, CADM1 KO reduced mossy fiber–PV⁺ interneuron synapses and GluA1 causing CA3 disinhibition; in squamous carcinoma, CADM1 formed a surface complex with HER2/integrin-α6β4 to suppress STAT3-driven proliferation and metastasis; and in pancreatic β-cells, transcellular CADM1 interactions constrained insulin secretion via exocytic site and actin network organization.","evidence":"KO electrophysiology and synapse counting; co-IP of CADM1/HER2/integrin complex with xenograft; CADM1 KD/OE in INS-1 cells and primary islets with insulin secretion assay","pmids":["27413156","27035095","27072493"],"confidence":"High","gaps":["Whether the HER2/integrin complex exists at synapses or only in carcinoma cells was unknown","Whether β-cell CADM1 is polysialylated was not addressed"]},{"year":2017,"claim":"How CADM1 ectodomain shedding is regulated was undefined; alternative splicing was shown to insert a non-glycosylatable spacer between protective O-glycans and the ADAM cleavage site, revealing a glycan-gated shedding switch that controls CADM1 surface levels.","evidence":"Shedding assays with splicing variants and O-glycosylation mutants, ADAM metalloprotease inhibitors","pmids":["28393893"],"confidence":"High","gaps":["Which ADAM family member is the primary sheddase in vivo was not identified","Functional consequence of shedding for synapse remodeling was not tested"]},{"year":2018,"claim":"Whether KSHV exploits the same CADM1 scaffold as HTLV-1 was unknown; vFLIP and vGPCR were shown to interact with CADM1's PDZ-binding motif in lipid rafts to activate IKK/NF-κB, establishing CADM1 as a shared viral oncogenic platform.","evidence":"Co-IP, lipid raft fractionation, CADM1 KD and PDZ-motif deletion in PEL cells","pmids":["29698475"],"confidence":"High","gaps":["Whether other oncogenic viruses use the same mechanism was untested","Structural basis of vFLIP–CADM1 PDZ interaction not resolved"]},{"year":2019,"claim":"Whether CADM1 regulates critical-period cortical plasticity was unknown; cell-type-specific KD in adult PV⁺ interneurons restored juvenile-like ocular dominance plasticity by reducing thalamocortical inputs and impairing feedforward inhibition maturation, establishing CADM1 as a molecular brake on critical-period closure.","evidence":"Conditional SynCAM 1 KO/KD in PV⁺ cells, monocular deprivation assay, synapse counting","pmids":["30625321"],"confidence":"High","gaps":["Downstream signaling linking CADM1 loss to plasticity reopening was not identified","Whether polysialylation of CADM1 contributes to critical-period timing was not tested"]},{"year":2021,"claim":"How measles virus spreads transsynaptically in receptor-negative neurons was unexplained; CADM1 and CADM2 were identified as cis-acting cofactors that trigger MeV fusion protein on the same membrane, enabling cell–cell fusion and viral transmission between neurons.","evidence":"siRNA KD, cell fusion assay, co-IP of CADM1 with MeV H protein in cis","pmids":["33910952"],"confidence":"High","gaps":["Whether cis-interaction is direct or involves intermediary membrane proteins was not fully resolved","In vivo validation in animal MeV infection model lacking"]},{"year":2023,"claim":"Whether CADM1 mutations could cause endocrine disease was unknown; somatic intramembranous gain-of-function mutations (V380D, G379D) in aldosterone-producing adenomas were shown to upregulate CYP11B2 by disrupting gap junction communication, establishing CADM1 as a causal gene in primary aldosteronism.","evidence":"WES of aldosterone-producing adenomas, mutant CADM1 transduction in H295R cells, gap junction dye transfer assay, Gap27 pharmacological blockade, patient adrenalectomy cure","pmids":["37291193"],"confidence":"High","gaps":["How intramembranous mutations mechanistically disrupt gap junctions (direct pore interaction vs. trafficking defect) was not resolved","Whether wild-type CADM1 regulates aldosterone in normal adrenal physiology was not established"]},{"year":null,"claim":"Key unresolved questions include: the structural basis of CADM1 cis-oligomers and their regulation by polysialylation; identification of the ADAM sheddase responsible in vivo and how shedding feeds back on synapse remodeling; the mechanism by which CADM1 loss permits immune evasion of metastases; and whether CADM1's diverse tissue-specific functions (synapse, spermatid, mast cell, β-cell, adrenal) rely on shared or distinct cytoplasmic signaling complexes.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of CADM1 cis or trans complexes","In vivo ADAM sheddase identity unknown","Mechanism of CD8⁺ T cell sensitization by CADM1 undefined","Tissue-specific complex composition not systematically compared"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[0,1,4,5,11,14,29,30]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[6,7,8,9]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[18,24,28]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,4,6,7,8,9,10,11,27]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[7]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[3,16]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,1,22,23]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[7,8,9,10,18,24]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[4,6,11,14,29]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[25]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[11,12]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[8,9,24]}],"complexes":["CADM1–4.1B–MPP2/MPP3 polarity complex","CADM1–MPP3–Dlg–PI3K(p85) signaling complex","CADM1–HER2–integrin-α6β4 surface complex"],"partners":["EPB41L3","MPP2","MPP3","PTPN13","ERBB4","PTK2","PARD3","NECTIN3"],"other_free_text":[]},"mechanistic_narrative":"CADM1 (SynCAM 1) is a transmembrane immunoglobulin superfamily adhesion molecule that organizes cell–cell contacts across neuronal synapses, epithelia, spermatids, mast cells, and endocrine tissues through Ca²⁺-independent homophilic and heterophilic trans-interactions and lateral cis-oligomerization via its Ig domains [PMID:21926970, PMID:18615557]. Its cytoplasmic PDZ-binding tail scaffolds complexes containing 4.1B, MPP/MAGuK proteins, Par-3, PI3K (p85), and PTPN13, coupling adhesion to actin cytoskeleton remodeling, epithelial polarity, and signaling through Akt/Rac1, Rb-E2F, and ErbB4 pathways [PMID:19854157, PMID:24503895, PMID:23769722]; this same tail is co-opted by HTLV-1 Tax and KSHV vFLIP/vGPCR to sustain NF-κB activation in virally transformed cells [PMID:25774694, PMID:29698475]. Post-translational regulation—including N-glycan–dependent modulation of adhesive strength, polysialylation by ST8SiaII that abolishes homophilic binding, and alternative splicing–controlled O-glycosylation gating of ADAM-mediated ectodomain shedding—tunes CADM1 function during synapse development and cortical critical-period plasticity, where CADM1 in parvalbumin-positive interneurons controls thalamocortical input number and feedforward inhibition maturation [PMID:20479255, PMID:22908220, PMID:28393893, PMID:30625321, PMID:27413156]. Somatic gain-of-function intramembranous CADM1 mutations cause aldosterone-producing adenomas and reversible hypertension by disrupting gap junction communication and de-repressing CYP11B2 [PMID:37291193]."},"prefetch_data":{"uniprot":{"accession":"Q9BY67","full_name":"Cell adhesion molecule 1","aliases":["Immunoglobulin superfamily member 4","IgSF4","Nectin-like protein 2","NECL-2","Spermatogenic immunoglobulin superfamily","SgIgSF","Synaptic cell adhesion molecule","SynCAM","Tumor suppressor in lung cancer 1","TSLC-1"],"length_aa":442,"mass_kda":48.5,"function":"Mediates homophilic cell-cell adhesion in a Ca(2+)-independent manner (PubMed:12050160, PubMed:22438059). Also mediates heterophilic cell-cell adhesion with CADM3 and NECTIN3 in a Ca(2+)-independent manner (By similarity). Interaction with CRTAM promotes natural killer (NK) cell cytotoxicity and interferon-gamma (IFN-gamma) secretion by CD8+ cells in vitro as well as NK cell-mediated rejection of tumors expressing CADM1 in vivo (PubMed:15811952). In mast cells, may mediate attachment to and promote communication with nerves (PubMed:15905536). CADM1, together with MITF, is essential for development and survival of mast cells in vivo (PubMed:22438059). By interacting with CRTAM and thus promoting the adhesion between CD8+ T-cells and CD8+ dendritic cells, regulates the retention of activated CD8+ T-cell within the draining lymph node (By similarity). Required for the intestinal retention of intraepithelial CD4+ CD8+ T-cells and, to a lesser extent, intraepithelial and lamina propria CD8+ T-cells and CD4+ T-cells (By similarity). Interaction with CRTAM promotes the adhesion to gut-associated CD103+ dendritic cells, which may facilitate the expression of gut-homing and adhesion molecules on T-cells and the conversion of CD4+ T-cells into CD4+ CD8+ T-cells (By similarity). Acts as a synaptic cell adhesion molecule and plays a role in the formation of dendritic spines and in synapse assembly (By similarity). May be involved in neuronal migration, axon growth, pathfinding, and fasciculation on the axons of differentiating neurons (By similarity). May play diverse roles in the spermatogenesis including in the adhesion of spermatocytes and spermatids to Sertoli cells and for their normal differentiation into mature spermatozoa (By similarity). Acts as a tumor suppressor in non-small-cell lung cancer (NSCLC) cells (PubMed:11279526, PubMed:12234973). May contribute to the less invasive phenotypes of lepidic growth tumor cells (PubMed:12920246) (Microbial infection) Induces cell fusion in neuron infected by a neuropathogenic strain of measles. Interacts with measles hemagglutinin to trigger hyperfusogenic F-mediated membrane fusion and presumably transsynaptic cell-to-cell transmission of the virus","subcellular_location":"Cell membrane; Synapse","url":"https://www.uniprot.org/uniprotkb/Q9BY67/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CADM1","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/CADM1","total_profiled":1310},"omim":[{"mim_id":"605686","title":"CELL ADHESION MOLECULE 1; CADM1","url":"https://www.omim.org/entry/605686"},{"mim_id":"604873","title":"MYELIN PROTEIN ZERO-LIKE 2; MPZL2","url":"https://www.omim.org/entry/604873"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"retina","ntpm":266.5}],"url":"https://www.proteinatlas.org/search/CADM1"},"hgnc":{"alias_symbol":["NECL2","ST17","BL2","SYNCAM","IGSF4A","Necl-2","SYNCAM1","RA175"],"prev_symbol":["TSLC1","IGSF4"]},"alphafold":{"accession":"Q9BY67","domains":[{"cath_id":"2.60.40.10","chopping":"46-140","consensus_level":"high","plddt":95.5193,"start":46,"end":140},{"cath_id":"2.60.40.10","chopping":"144-230","consensus_level":"high","plddt":94.2078,"start":144,"end":230},{"cath_id":"2.60.40.10","chopping":"242-327","consensus_level":"high","plddt":94.2262,"start":242,"end":327}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BY67","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BY67-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BY67-F1-predicted_aligned_error_v6.png","plddt_mean":80.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CADM1","jax_strain_url":"https://www.jax.org/strain/search?query=CADM1"},"sequence":{"accession":"Q9BY67","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BY67.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BY67/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BY67"}},"corpus_meta":[{"pmid":"15634790","id":"PMC_15634790","title":"Selective 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the dominant-positive effect on synaptic function in developing neurons is mediated by its intracellular cytoplasmic tail.\",\n      \"method\": \"Co-culture synapse induction assay, electrophysiology (mEPSC recording), chimeric molecule analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — functional reconstitution in co-culture with mechanistic dissection via chimeric constructs; replicated across multiple measures\",\n      \"pmids\": [\"15634790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SynCAM 1 (CADM1) overexpression in transgenic mice increases excitatory synapse number, while knockout reduces excitatory synapses; SynCAM 1 also regulates long-term depression and spatial learning, demonstrating it maintains synapses and modulates plasticity in vivo.\",\n      \"method\": \"Transgenic overexpression and knockout mouse models, electrophysiology, behavioral testing (spatial learning)\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal gain/loss-of-function in vivo with multiple orthogonal phenotypic readouts\",\n      \"pmids\": [\"21145003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SynCAM 1 (CADM1) is a target for polysialylation in postnatal mouse brain; both polysialyltransferases ST8SiaII and ST8SiaIV polysialylate SynCAM 1 in vitro on N-glycans of the first Ig domain, and polysialylation completely abolishes homophilic SynCAM 1 binding.\",\n      \"method\": \"Affinity purification, peptide mass fingerprinting (glycoproteomics), in vitro polysialylation assay, homophilic binding assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro enzymatic assay with functional (binding) readout, replicated across ST8SiaII and ST8SiaIV\",\n      \"pmids\": [\"20479255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SynCAM 1 (CADM1) localizes to neuronal growth cones and, upon contact with target neurites, rapidly assembles into stable adhesive clusters; SynCAM 1 restricts filopodial number and growth cone morphological complexity; focal adhesion kinase (FAK) is a binding partner implicated in these morphogenetic activities.\",\n      \"method\": \"Live imaging, immunofluorescence localization, siRNA knockdown and overexpression in neurons, FAK co-immunoprecipitation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization tied to functional consequence, with KD/OE and binding partner identification\",\n      \"pmids\": [\"20368431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SynCAM 1 (CADM1) self-assembles laterally (cis oligomerization) via its extracellular membrane-proximal Ig domains 2 and 3; this cis oligomerization generates SynCAM oligomers with increased adhesive capacity, promotes adhesive clustering at new axo-dendritic contacts, is required for synaptogenic activity, and restricts synaptic size at mature synapses.\",\n      \"method\": \"Biochemical oligomerization assays, mutagenesis of Ig domains, immunofluorescence in differentiating neurons, synapse induction assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — biochemical reconstitution with domain mutagenesis plus functional synaptogenesis assay\",\n      \"pmids\": [\"21926970\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Site-specific N-glycosylation differentially modulates SynCAM adhesion: N-glycan on SynCAM 2 Asn60 reduces adhesion, while N-glycans on SynCAM 1 Asn70/Asn104 (which flank the Ig1 binding interface) increase interactions; sialylation of SynCAM 1 contributes to glycan-dependent strengthening; N-glycosylation promotes trans-synaptic SynCAM 1 interactions and is required for synapse induction.\",\n      \"method\": \"X-ray crystallography (SynCAM 2 Ig1 domain), mass spectrometry, site-directed mutagenesis, adhesion assay, synapse induction assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure plus mutagenesis plus functional assay in single study\",\n      \"pmids\": [\"20739279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CADM1 associates with actin-binding protein 4.1B/DAL-1 and scaffold proteins MPP1/p55, MPP2/DLG2, and MPP3/DLG3, forming a tripartite complex; MPP2 is recruited to the CADM1-4.1B complex during early adhesion; siRNA knockdown of CADM1 in HEK293 cells causes loss of epithelial-like structure, flat morphology, and mislocalization of 4.1B, MPP2, E-cadherin, and ZO-1 from the membrane.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple binding partners confirmed by co-IP plus loss-of-function with defined structural phenotype\",\n      \"pmids\": [\"19854157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Trans-homophilic interaction of CADM1 activates PI3K signaling; MPP3 and Dlg (MAGuK-family proteins) connect CADM1 with the p85 subunit of PI3K forming a multi-protein complex at the cell periphery; PI3K inhibition suppresses CADM1-mediated cell spreading, and downstream Akt and Rac1 partially mediate this effect on actin cytoskeleton reorganization and epithelial structure formation.\",\n      \"method\": \"Cell-based spreading assay on recombinant CADM1-coated substrate, chemical inhibitor screen (104 inhibitors), co-immunoprecipitation of CADM1/MPP3/Dlg/p85 complex\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-based reconstitution assay with inhibitor screen and co-IP of complex; multiple orthogonal approaches\",\n      \"pmids\": [\"24503895\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HTLV-1 Tax requires membrane-associated CADM1 as a scaffold: CADM1 recruits Ubc13 to Tax causing K63-linked polyubiquitination of Tax and IKK complex activation in plasma membrane lipid rafts; the PDZ-binding motif in CADM1's cytoplasmic tail is critical; in the absence of CADM1, Tax fails to inactivate the A20 ubiquitin-editing enzyme complex and cannot activate IKK, abolishing persistent NF-κB signaling.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, lipid raft fractionation, CADM1 knockdown/knockout, PDZ-motif deletion mutants\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic complex reconstitution with domain mutants and KO, multiple orthogonal methods\",\n      \"pmids\": [\"25774694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"KSHV oncoproteins vFLIP and vGPCR interact with CADM1; the PDZ-binding motif at the C-terminus of CADM1 is essential for both vGPCR- and vFLIP-mediated chronic NF-κB activation; lipid raft-associated CADM1 interaction with vFLIP is critical for IKK complex initiation; CADM1 is required for survival of KSHV-associated PEL cells.\",\n      \"method\": \"Co-immunoprecipitation, lipid raft fractionation, CADM1 knockdown, PDZ-motif deletion analysis, cell viability assays\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic co-IP with domain mutants, parallels HTLV-1 Tax findings; multiple orthogonal methods\",\n      \"pmids\": [\"29698475\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CADM1 inhibits squamous cell carcinoma proliferation and invasion by forming a cell-surface complex with HER2 and integrin α6β4 that disrupts downstream STAT3 activity; this requires the extracellular domain of CADM1; JAK/STAT inhibition mimics CADM1 restoration in preventing SqCC growth and metastasis.\",\n      \"method\": \"Gene transduction, co-immunoprecipitation (CADM1/HER2/integrin α6β4 complex), xenograft tumor assay, STAT3 phosphorylation assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — complex identified by co-IP, domain requirement established, in vivo xenograft validation\",\n      \"pmids\": [\"27035095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Knockout of RA175/CADM1 in male mice causes infertility due to failure of elongating spermatids (steps 9–12) to mature and translocate to the adluminal surface; CADM1 is expressed at cell junctions of spermatocytes and elongating spermatids and is required for retaining them in Sertoli cell invaginations.\",\n      \"method\": \"Gene knockout mouse model, histological analysis of testis, immunofluorescence localization\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — complete KO with defined cellular phenotype and localization in same study\",\n      \"pmids\": [\"16382161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Par-3 (a cell polarity protein with PDZ domains) binds the cytoplasmic region of RA175/CADM1 in testis; RA175 forms a ternary complex with JAM-C via Par-3 interaction; in RA175-knockout elongating spermatids, Par-3 is absent and JAM-C is absent or mislocalized, indicating that CADM1 organizes polarity machinery in spermatids.\",\n      \"method\": \"Co-immunoprecipitation (ternary complex), immunofluorescence in RA175-KO vs wildtype testis\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP of ternary complex plus KO phenotype, single lab\",\n      \"pmids\": [\"18055550\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Two missense mutations in CADM1 (H246N and Y251S) located in the third Ig domain, identified in ASD patients, result in reduced high-molecular-weight (mature oligosaccharide-containing) forms, defective trafficking to the cell surface, and increased susceptibility to cleavage/degradation; the third Ig domain is essential for trans-active interaction.\",\n      \"method\": \"Patient mutation identification, Western blot (glycoform analysis), cell surface biotinylation, degradation assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional characterization of disease mutations with multiple biochemical readouts, single lab\",\n      \"pmids\": [\"18957284\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CADM1-mediated homophilic adhesion of mast cells to neurons is required for mast cell degranulation and IL-6 secretion enhancement; knockdown of CADM1 in bone marrow-derived mast cells or application of a CADM1 blocking peptide significantly decreased BMMC attachment to sensory neurites and abolished enhanced secretory responses.\",\n      \"method\": \"CADM1 siRNA knockdown, blocking peptide, BMMC-DRG neuron co-culture, β-hexosaminidase degranulation assay, cytokine ELISA\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with defined functional phenotype in co-culture model, single lab\",\n      \"pmids\": [\"31275114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"On mast cells, CADM1 promotes attachment to dorsal root ganglion (DRG) neurites through heterophilic binding to nectin-3 expressed on DRG neurons; neutralizing antibody to nectin-3 inhibits both mast cell attachment and subsequent calcium responses, despite low CADM1 expression on DRG.\",\n      \"method\": \"Adhesion assay, neutralizing antibody blocking, calcium imaging, immunofluorescence of nectin-3 at cell-cell contacts\",\n      \"journal\": \"Journal of neuroimmunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional blocking antibody identifies heterophilic ligand, single lab\",\n      \"pmids\": [\"22703826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CADM1 controls actin cytoskeleton assembly in human mast cells; downregulation of CADM1 in HMC-1 cells reduces surface KIT levels, alters cortical F-actin polymerization, elongates cortical actin filaments, increases cell rigidity, and reduces ECM adhesion indirectly through regulation of integrin function.\",\n      \"method\": \"siRNA knockdown, flow cytometry (surface KIT), confocal microscopy (F-actin), atomic force microscopy (cell rigidity), adhesion assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"24465823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CADM1 polysialylation in mouse brain is exclusively mediated by ST8SiaII in vivo (not ST8SiaIV); polysialylation requires both Ig1 (which contains the glycosylation site) and Ig2 (which serves as a docking site for ST8SiaII), as Ig1 alone is insufficient as an acceptor.\",\n      \"method\": \"ST8SiaII and ST8SiaIV single knockout mouse analysis, domain-deletion constructs, in vitro polysialylation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro enzymatic assay with domain deletions and in vivo KO validation; replicates and extends prior polysialylation finding\",\n      \"pmids\": [\"22908220\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CADM1 (Necl-2) interacts with ErbB4 receptor tyrosine kinase in parvalbumin-positive GABAergic neurons; Necl-2 knockdown enhances Nrg1-induced ErbB4 phosphorylation; overexpression of PTPN13 (a tyrosine phosphatase bound to the cytoplasmic tail of Necl-2) suppresses Nrg1-induced excitatory synapse development in GABAergic neurons through inhibition of ErbB4 activity.\",\n      \"method\": \"Co-immunoprecipitation (Necl-2/ErbB4), siRNA knockdown, PTPN13 overexpression, phospho-ErbB4 assay, synapse morphology analysis\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with functional KD/OE and defined downstream signaling readout, single lab\",\n      \"pmids\": [\"23769722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TWIST1 transcription factor directly binds the CADM1 promoter (shown by ChIP and promoter assays) to repress CADM1 expression; restored CADM1 expression inhibits melanoma cell motility and invasion, and induces caspase-independent cell death in non-adherent conditions associated with loss of mitochondrial membrane potential.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), promoter reporter assay, CADM1 overexpression, migration/invasion assay, apoptosis assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct promoter binding confirmed by ChIP plus functional rescue, single lab\",\n      \"pmids\": [\"30911007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CADM1 regulates G1/S cell cycle transition in hepatocellular carcinoma; ectopic CADM1 expression increases Retinoblastoma (Rb) protein levels, inhibits cell growth, and suppresses tumorigenicity in vitro and in vivo, implicating the Rb-E2F pathway in CADM1-mediated tumor suppression.\",\n      \"method\": \"Cell cycle analysis, EdU incorporation, colony formation assay, in vivo xenograft, Western blot (Rb protein levels)\",\n      \"journal\": \"Hepatobiliary & pancreatic diseases international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro and in vivo functional assays with defined signaling pathway readout, single lab\",\n      \"pmids\": [\"27298105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CADM1 ectodomain shedding susceptibility is determined by alternative splicing and O-glycosylation: a 33-bp alternative exon inserts five non-glycosylatable amino acids between O-glycans (which normally block ADAM-family metalloprotease access) and the cleavage site, conferring shedding susceptibility; O-glycans adjacent to the cleavage site thus interfere with shedding.\",\n      \"method\": \"Shedding assays with CADM1 splicing variants, O-glycosylation mutants, ADAM metalloprotease inhibitors\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mechanistic dissection with domain/glycosylation mutants and reconstituted shedding assay\",\n      \"pmids\": [\"28393893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SynCAM 1/CADM1 acts cell-autonomously in parvalbumin-positive (PV+) interneurons to regulate thalamocortical synapse number onto PV+ cells and restrict cortical plasticity; selective knockdown of SynCAM 1 in adult PV+ interneurons restores juvenile-like plasticity in visual cortex, and SynCAM 1 loss reduces thalamocortical inputs onto PV+ cells impairing feedforward inhibition maturation.\",\n      \"method\": \"Conditional and cell-type-specific SynCAM 1 KO/knockdown, monocular deprivation plasticity assay, immunofluorescence synapse counting\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-autonomous cell-type-specific KD with defined synaptic and plasticity phenotype\",\n      \"pmids\": [\"30625321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SynCAM 1 (CADM1) loss reduces excitatory mossy fiber inputs onto parvalbumin-positive interneurons in hippocampal CA3, decreases postsynaptic GluA1 expression in these interneurons, and causes CA3 disinhibition; SynCAM 1 KO also reduces excitatory synapse number in nucleus accumbens and impairs mossy fiber refinement in CA3.\",\n      \"method\": \"SynCAM 1 knockout mice, DTI-MRI, electrophysiology (feedforward inhibition), immunofluorescence synapse counting, Western blot (GluA1)\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO with multiple orthogonal circuit-level and molecular readouts\",\n      \"pmids\": [\"27413156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Somatic gain-of-function CADM1 mutations (p.Val380Asp, p.Gly379Asp) in aldosterone-producing adenomas cause reversible hypertension; these intramembranous mutations markedly upregulate CYP11B2 (aldosterone synthase) 10–25-fold; CADM1 mutation or knockdown inhibits gap junction-permeable dye transfer, and gap junction blockade by Gap27 increases CYP11B2 similarly to CADM1 mutation, revealing that CADM1 normally suppresses aldosterone production via gap junction communication.\",\n      \"method\": \"Whole exome sequencing, H295R cell transduction with mutant CADM1, gene expression profiling, gap junction dye transfer assay, Gap27 pharmacological blockade, adrenalectomy cure in patients\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — human somatic mutations functionally validated in cell model with mechanistic dissection (gap junction assay) and clinical cure; replicated in multiple patients\",\n      \"pmids\": [\"37291193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CADM1 suppresses metastasis in a manner that requires the host's adaptive immune system; loss of CADM1 metastasis suppression is recapitulated by depletion of CD8+ T cells in immune-competent mice, indicating CADM1 sensitizes tumor cells to immune surveillance without affecting tumor-cell-autonomous proliferation or invasion.\",\n      \"method\": \"Genetic screen (complex cross), CADM1 KO mouse models, CD8+ T cell depletion, metastasis assay (lung colonization)\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis (CD8 depletion) defines pathway; single lab\",\n      \"pmids\": [\"23028344\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CADM1 regulates TNFα-induced migration of endothelial progenitor cells; TNFα activates NF-κB, which upregulates CADM1 expression; inhibition of NF-κB or CADM1 knockdown significantly decreases EPC migration and incorporation into vessel-like structures in vitro.\",\n      \"method\": \"siRNA knockdown, NF-κB inhibitor, migration/incorporation co-culture assay, genomic and proteomic approaches\",\n      \"journal\": \"Stem cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with functional migration phenotype plus pathway placement by NF-κB inhibitor, single lab\",\n      \"pmids\": [\"26867147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CADM1 and CADM2 act in cis (on the same cell membrane as the viral protein, not in trans) with the measles virus attachment protein on neurons lacking canonical MeV receptors, triggering the fusion protein and enabling membrane fusion and transsynaptic MeV spread; knockdown of CADM1 and CADM2 inhibits syncytium formation and virus transmission between neurons.\",\n      \"method\": \"siRNA knockdown, cell fusion assays, expression of hyperfusogenic MeV F protein, co-immunoprecipitation of CADM1 with MeV H protein in cis\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic co-IP, KD with defined viral spread phenotype, novel receptor-mimicking cis mechanism characterized\",\n      \"pmids\": [\"33910952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Extracellular CADM1 interactions in pancreatic β-cells constrain insulin secretion; CADM1 expression decreases after prolonged glucose stimulation; transcellular CADM1 interactions promote exocytic site assembly and actin network formation in β-cells, paralleling its role at CNS synapses.\",\n      \"method\": \"CADM1 overexpression and siRNA knockdown in INS-1 insulinoma cells and primary rat/human islet β-cells, insulin secretion assay, co-culture model, actin and syntaxin-1 imaging\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD/OE with secretion phenotype and subcellular imaging in primary cells plus cell line, single lab\",\n      \"pmids\": [\"27072493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CADM1 isoforms differentially regulate human mast cell survival and homotypic adhesion; CADM1 is the sole receptor mediating mast cell aggregation (knockdown abolishes homotypic adhesion); CADM1 downregulation reduces viability and Mcl-1(L) expression, increasing caspase-3/7 activity; SP4 isoform augments homotypic adhesion more than SP1.\",\n      \"method\": \"siRNA knockdown (complete abolition of aggregation), isoform-specific overexpression, cell viability assay, caspase-3/7 activity, Western blot (Mcl-1)\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — isoform-specific KD/OE with multiple survival and adhesion readouts, single lab\",\n      \"pmids\": [\"22438059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SynCAM family members engage in specific heterophilic adhesion interactions: SynCAMs 1/2, 2/4, and 3/4 mediate the three prominent trans-interactions, as shown by cell overlay experiments using extracellular domains.\",\n      \"method\": \"Cell overlay adhesion experiments with SynCAM extracellular domain constructs, in situ hybridization, immunohistochemistry\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — cell overlay binding assay defines heterophilic interaction network, single lab\",\n      \"pmids\": [\"18615557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Cadm1 knockout mice exhibit impaired social interaction, increased anxiety-related behavior, and impaired motor coordination, demonstrating that CADM1-mediated synaptic adhesion is required for normal emotional, social, and motor behaviors.\",\n      \"method\": \"Cadm1 knockout mice, open-field test, light-dark transition test, social interaction/memory/recognition tests, rotarod, footprint analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO with multiple defined behavioral phenotypes, single lab\",\n      \"pmids\": [\"20450890\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CADM1 (SynCAM 1) is a transmembrane immunoglobulin superfamily cell adhesion molecule that mediates Ca2+-independent homo- and heterophilic trans-adhesion via its extracellular Ig domains and lateral cis-oligomerization; its cytoplasmic PDZ-binding tail scaffolds complexes with 4.1B, MPP/MAGuK proteins, and PI3K to regulate epithelial polarity, actin cytoskeleton organization, and cell survival; at synapses it organizes excitatory synapse development, number, and plasticity (including feedforward inhibition by PV+ interneurons and critical-period closure); post-translational regulation by N-glycosylation, O-glycosylation-dependent ectodomain shedding, and polysialylation (exclusively via ST8SiaII) modulates its adhesive function; in HTLV-1- and KSHV-infected cells the PDZ tail acts as a scaffold for viral oncoproteins to sustain NF-κB activation; somatic gain-of-function intramembranous mutations cause aldosterone excess by disrupting gap junction communication; and it mediates mast cell adhesion to neurons/fibroblasts and mast cell survival through Mcl-1 regulation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CADM1 (SynCAM 1) is a transmembrane immunoglobulin superfamily adhesion molecule that organizes cell–cell contacts across neuronal synapses, epithelia, spermatids, mast cells, and endocrine tissues through Ca²⁺-independent homophilic and heterophilic trans-interactions and lateral cis-oligomerization via its Ig domains [PMID:21926970, PMID:18615557]. Its cytoplasmic PDZ-binding tail scaffolds complexes containing 4.1B, MPP/MAGuK proteins, Par-3, PI3K (p85), and PTPN13, coupling adhesion to actin cytoskeleton remodeling, epithelial polarity, and signaling through Akt/Rac1, Rb-E2F, and ErbB4 pathways [PMID:19854157, PMID:24503895, PMID:23769722]; this same tail is co-opted by HTLV-1 Tax and KSHV vFLIP/vGPCR to sustain NF-κB activation in virally transformed cells [PMID:25774694, PMID:29698475]. Post-translational regulation—including N-glycan–dependent modulation of adhesive strength, polysialylation by ST8SiaII that abolishes homophilic binding, and alternative splicing–controlled O-glycosylation gating of ADAM-mediated ectodomain shedding—tunes CADM1 function during synapse development and cortical critical-period plasticity, where CADM1 in parvalbumin-positive interneurons controls thalamocortical input number and feedforward inhibition maturation [PMID:20479255, PMID:22908220, PMID:28393893, PMID:30625321, PMID:27413156]. Somatic gain-of-function intramembranous CADM1 mutations cause aldosterone-producing adenomas and reversible hypertension by disrupting gap junction communication and de-repressing CYP11B2 [PMID:37291193].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Whether a single adhesion molecule could instruct presynaptic assembly was unknown; demonstrating that CADM1 expressed in non-neuronal cells induces functional presynaptic terminals via its cytoplasmic tail established CADM1 as a synaptogenic organizer.\",\n      \"evidence\": \"Co-culture synapse induction assay with electrophysiology and chimeric constructs in neurons\",\n      \"pmids\": [\"15634790\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of cytoplasmic binding partners mediating synaptogenic signaling not determined\", \"Whether CADM1 is required (not just sufficient) for synapse formation in vivo was untested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Whether CADM1 adhesion serves non-neuronal tissue morphogenesis was unclear; knockout mice revealed CADM1 is essential for spermatid maturation and retention within Sertoli cell invaginations, broadening its role to germ cell–somatic cell adhesion.\",\n      \"evidence\": \"CADM1 knockout mouse with testicular histology and immunofluorescence\",\n      \"pmids\": [\"16382161\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular partners at the spermatid–Sertoli junction were uncharacterized\", \"Whether heterophilic ligands contribute to spermatid adhesion was unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"How CADM1 organizes polarity in spermatids was unknown; identification of a Par-3-mediated ternary complex linking CADM1 to JAM-C, lost in knockout spermatids, established CADM1 as a polarity scaffold in male germ cells.\",\n      \"evidence\": \"Co-immunoprecipitation of CADM1/Par-3/JAM-C ternary complex, immunofluorescence in KO testis\",\n      \"pmids\": [\"18055550\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab co-IP without reciprocal validation from an independent group\", \"Whether Par-3 interaction applies at neuronal synapses was untested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"The heterophilic binding code of the SynCAM family was undefined; systematic cell overlay experiments mapped SynCAM 1/2, 2/4, and 3/4 as the dominant trans-heterophilic pairs, defining how SynCAM diversity generates contact specificity.\",\n      \"evidence\": \"Cell overlay adhesion assay using extracellular domain constructs, in situ hybridization\",\n      \"pmids\": [\"18615557\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Affinities not quantified\", \"In vivo relevance of heterophilic pairs at specific synapses not demonstrated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"How CADM1's cytoplasmic domain controls epithelial architecture was poorly understood; identification of the CADM1–4.1B–MPP2/MPP3 tripartite complex and demonstration that CADM1 knockdown causes loss of epithelial polarity markers established CADM1 as a membrane-proximal scaffold for polarity and junction organization.\",\n      \"evidence\": \"Co-immunoprecipitation of tripartite complex, siRNA knockdown in HEK293 cells with immunofluorescence\",\n      \"pmids\": [\"19854157\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the tripartite complex operates identically at neuronal synapses was unknown\", \"Structural basis of 4.1B–MPP2 recruitment not resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Three concurrent advances resolved how CADM1 functions in vivo and how glycosylation tunes its adhesion: transgenic/KO mice showed CADM1 maintains excitatory synapse number and modulates LTD and spatial learning; polysialylation on N-glycans of Ig1 was shown to abolish homophilic binding; and site-specific N-glycosylation was demonstrated to strengthen trans-synaptic interactions and be required for synapse induction.\",\n      \"evidence\": \"Transgenic overexpression/KO mice with electrophysiology and behavior; in vitro polysialylation and binding assays; crystal structure with mutagenesis and synapse induction assay\",\n      \"pmids\": [\"21145003\", \"20479255\", \"20739279\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which polysialyltransferase acts on CADM1 in vivo was unresolved (both ST8SiaII and ST8SiaIV active in vitro)\", \"Whether polysialylation regulates synapse number in vivo was untested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"CADM1's role at growth cones was unknown; live imaging showed CADM1 rapidly clusters at nascent axo-dendritic contacts, restricts filopodial complexity, and associates with FAK, linking adhesion to growth cone morphogenesis.\",\n      \"evidence\": \"Live imaging, siRNA/overexpression in neurons, FAK co-immunoprecipitation\",\n      \"pmids\": [\"20368431\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether FAK is a direct or indirect CADM1 interactor was not resolved\", \"Upstream signals triggering CADM1 clustering were undefined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Whether CADM1 acts as monomers or oligomers was unresolved; biochemical and mutagenesis studies showed cis-oligomerization through Ig2–Ig3 domains is required for adhesive clustering and synaptogenic activity, and restricts synaptic size at mature contacts.\",\n      \"evidence\": \"Biochemical oligomerization assays, domain mutagenesis, synapse induction in differentiating neurons\",\n      \"pmids\": [\"21926970\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structure of cis oligomers not determined\", \"Relationship between cis-oligomerization and polysialylation regulation unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Multiple 2012 studies resolved isoform-specific functions and in vivo polysialylation: ST8SiaII was identified as the exclusive in vivo polysialyltransferase requiring both Ig1 and Ig2 domains; CADM1 isoforms were shown to differentially control mast cell survival (via Mcl-1) and homotypic adhesion; and CADM1 was identified as a metastasis suppressor dependent on host CD8⁺ T cell immunity.\",\n      \"evidence\": \"ST8SiaII/IV KO mice with in vitro polysialylation; mast cell isoform-specific KD/OE with caspase and adhesion assays; CADM1 KO with CD8 depletion epistasis in metastasis model\",\n      \"pmids\": [\"22908220\", \"22438059\", \"23028344\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CADM1 loss evades CD8⁺ T cell recognition mechanistically was unknown\", \"Whether mast cell isoform effects apply in vivo was not shown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"How mast cells adhere to neurons was poorly defined; co-culture experiments showed CADM1-mediated homophilic adhesion drives mast cell–neuron attachment, degranulation, and IL-6 secretion, while heterophilic binding to nectin-3 on DRG neurons was identified as an additional trans-ligand.\",\n      \"evidence\": \"CADM1 siRNA and blocking peptide in BMMC–DRG co-culture; nectin-3 neutralizing antibody with calcium imaging\",\n      \"pmids\": [\"31275114\", \"22703826\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative contributions of homophilic vs. nectin-3 heterophilic adhesion not quantified in vivo\", \"Whether mast cell–neuron CADM1 adhesion is polysialylation-regulated was unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"How CADM1 influences inhibitory circuit development was unclear; identification of CADM1–ErbB4 interaction in PV⁺ interneurons, with PTPN13 as a cytoplasmic phosphatase recruited to CADM1 that suppresses Nrg1/ErbB4-driven excitatory synapse formation, revealed CADM1 as a negative modulator of ErbB4 signaling in GABAergic neurons.\",\n      \"evidence\": \"Co-immunoprecipitation of CADM1–ErbB4, siRNA knockdown, PTPN13 overexpression, phospho-ErbB4 assay\",\n      \"pmids\": [\"23769722\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"PTPN13 interaction with CADM1 not confirmed by reciprocal IP or structural data\", \"In vivo relevance in PV⁺ interneuron development not demonstrated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The signaling pathway downstream of CADM1 trans-adhesion was undefined; reconstitution showed CADM1 activates PI3K through a CADM1–MPP3–Dlg–p85 complex, driving Akt/Rac1-dependent actin reorganization and epithelial spreading.\",\n      \"evidence\": \"Spreading assay on recombinant CADM1, chemical inhibitor screen, co-immunoprecipitation of quaternary complex\",\n      \"pmids\": [\"24503895\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PI3K signaling mediates CADM1's synaptogenic activity was untested\", \"Direct vs. bridged interaction between CADM1 and p85 not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"How viral oncoproteins hijack CADM1 was unknown; HTLV-1 Tax was shown to require CADM1's PDZ-binding tail to recruit Ubc13 for K63-linked polyubiquitination in lipid rafts, activating IKK and sustaining NF-κB signaling while inactivating A20.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, lipid raft fractionation, CADM1 KO and PDZ-motif deletion mutants\",\n      \"pmids\": [\"25774694\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CADM1 scaffolding of NF-κB occurs in non-infected cells was unknown\", \"Structural basis of Tax–CADM1 interaction not resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Multiple 2016 discoveries broadened CADM1's circuit and signaling roles: in hippocampus, CADM1 KO reduced mossy fiber–PV⁺ interneuron synapses and GluA1 causing CA3 disinhibition; in squamous carcinoma, CADM1 formed a surface complex with HER2/integrin-α6β4 to suppress STAT3-driven proliferation and metastasis; and in pancreatic β-cells, transcellular CADM1 interactions constrained insulin secretion via exocytic site and actin network organization.\",\n      \"evidence\": \"KO electrophysiology and synapse counting; co-IP of CADM1/HER2/integrin complex with xenograft; CADM1 KD/OE in INS-1 cells and primary islets with insulin secretion assay\",\n      \"pmids\": [\"27413156\", \"27035095\", \"27072493\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the HER2/integrin complex exists at synapses or only in carcinoma cells was unknown\", \"Whether β-cell CADM1 is polysialylated was not addressed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"How CADM1 ectodomain shedding is regulated was undefined; alternative splicing was shown to insert a non-glycosylatable spacer between protective O-glycans and the ADAM cleavage site, revealing a glycan-gated shedding switch that controls CADM1 surface levels.\",\n      \"evidence\": \"Shedding assays with splicing variants and O-glycosylation mutants, ADAM metalloprotease inhibitors\",\n      \"pmids\": [\"28393893\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which ADAM family member is the primary sheddase in vivo was not identified\", \"Functional consequence of shedding for synapse remodeling was not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Whether KSHV exploits the same CADM1 scaffold as HTLV-1 was unknown; vFLIP and vGPCR were shown to interact with CADM1's PDZ-binding motif in lipid rafts to activate IKK/NF-κB, establishing CADM1 as a shared viral oncogenic platform.\",\n      \"evidence\": \"Co-IP, lipid raft fractionation, CADM1 KD and PDZ-motif deletion in PEL cells\",\n      \"pmids\": [\"29698475\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other oncogenic viruses use the same mechanism was untested\", \"Structural basis of vFLIP–CADM1 PDZ interaction not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Whether CADM1 regulates critical-period cortical plasticity was unknown; cell-type-specific KD in adult PV⁺ interneurons restored juvenile-like ocular dominance plasticity by reducing thalamocortical inputs and impairing feedforward inhibition maturation, establishing CADM1 as a molecular brake on critical-period closure.\",\n      \"evidence\": \"Conditional SynCAM 1 KO/KD in PV⁺ cells, monocular deprivation assay, synapse counting\",\n      \"pmids\": [\"30625321\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling linking CADM1 loss to plasticity reopening was not identified\", \"Whether polysialylation of CADM1 contributes to critical-period timing was not tested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"How measles virus spreads transsynaptically in receptor-negative neurons was unexplained; CADM1 and CADM2 were identified as cis-acting cofactors that trigger MeV fusion protein on the same membrane, enabling cell–cell fusion and viral transmission between neurons.\",\n      \"evidence\": \"siRNA KD, cell fusion assay, co-IP of CADM1 with MeV H protein in cis\",\n      \"pmids\": [\"33910952\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether cis-interaction is direct or involves intermediary membrane proteins was not fully resolved\", \"In vivo validation in animal MeV infection model lacking\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Whether CADM1 mutations could cause endocrine disease was unknown; somatic intramembranous gain-of-function mutations (V380D, G379D) in aldosterone-producing adenomas were shown to upregulate CYP11B2 by disrupting gap junction communication, establishing CADM1 as a causal gene in primary aldosteronism.\",\n      \"evidence\": \"WES of aldosterone-producing adenomas, mutant CADM1 transduction in H295R cells, gap junction dye transfer assay, Gap27 pharmacological blockade, patient adrenalectomy cure\",\n      \"pmids\": [\"37291193\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How intramembranous mutations mechanistically disrupt gap junctions (direct pore interaction vs. trafficking defect) was not resolved\", \"Whether wild-type CADM1 regulates aldosterone in normal adrenal physiology was not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the structural basis of CADM1 cis-oligomers and their regulation by polysialylation; identification of the ADAM sheddase responsible in vivo and how shedding feeds back on synapse remodeling; the mechanism by which CADM1 loss permits immune evasion of metastases; and whether CADM1's diverse tissue-specific functions (synapse, spermatid, mast cell, β-cell, adrenal) rely on shared or distinct cytoplasmic signaling complexes.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of CADM1 cis or trans complexes\", \"In vivo ADAM sheddase identity unknown\", \"Mechanism of CD8⁺ T cell sensitization by CADM1 undefined\", \"Tissue-specific complex composition not systematically compared\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [0, 1, 4, 5, 11, 14, 29, 30]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [6, 7, 8, 9]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [18, 24, 28]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 4, 6, 7, 8, 9, 10, 11, 27]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [3, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 1, 22, 23]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [7, 8, 9, 10, 18, 24]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [4, 6, 11, 14, 29]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [25]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [11, 12]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [8, 9, 24]}\n    ],\n    \"complexes\": [\n      \"CADM1–4.1B–MPP2/MPP3 polarity complex\",\n      \"CADM1–MPP3–Dlg–PI3K(p85) signaling complex\",\n      \"CADM1–HER2–integrin-α6β4 surface complex\"\n    ],\n    \"partners\": [\n      \"EPB41L3\",\n      \"MPP2\",\n      \"MPP3\",\n      \"PTPN13\",\n      \"ERBB4\",\n      \"PTK2\",\n      \"PARD3\",\n      \"NECTIN3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}