{"gene":"SCN2B","run_date":"2026-06-10T07:46:29","timeline":{"discoveries":[{"year":2009,"finding":"SCN2B mutations R28Q and R28W reduce SCN5A-mediated sodium current and alter channel gating when coexpressed in CHO cells, establishing loss-of-function of the β2 subunit as a mechanism contributing to atrial fibrillation susceptibility.","method":"Heterologous expression in CHO cells with patch-clamp electrophysiology","journal":"Circulation. Arrhythmia and electrophysiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct electrophysiological functional assay in heterologous system, single lab, two mutations tested with consistent results","pmids":["19808477"],"is_preprint":false},{"year":2009,"finding":"In neurons from Scn2b null mice, β4-expressing cells showed slowed entry into inactivated states, demonstrating that β2 subunits normally promote Na+ channel inactivation; β1 and β4 have antagonistic roles on inactivation that are modulated by β2.","method":"Whole-cell patch-clamp in cultured hippocampal neurons from Scn1b and Scn1b/Scn2b null mice","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic null mouse combined with electrophysiology, single lab, multiple genotypes compared","pmids":["19228957"],"is_preprint":false},{"year":2012,"finding":"A single extracellular cysteine residue, Cys-26 within the immunoglobulin domain of β2, is responsible for the disulfide linkage between the Na+ channel α and β2 subunits; loss of this covalent linkage (C26A mutation) disrupts β2 targeting to nodes of Ranvier and the axon initial segment and prevents β2 association with the neuronal cytoskeleton.","method":"Mutagenesis of β2 cDNA constructs, myelinating co-culture system, primary hippocampal neuron imaging, Triton X-100 detergent extraction","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — site-directed mutagenesis combined with functional localization assays, multiple orthogonal methods (biochemical, cell imaging, detergent resistance) in one rigorous study","pmids":["22992729"],"is_preprint":false},{"year":2013,"finding":"The Brugada syndrome-associated β2 missense mutation D211G reduces Nav1.5 sodium current density by ~39% without affecting unitary channel conductance; membrane protein detection experiments indicate the mutant decreases Nav1.5 cell surface expression.","method":"Patch-clamp electrophysiology (whole-cell and single-channel), cell surface biotinylation in heterologous expression system","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal methods (electrophysiology + surface biotinylation), single lab","pmids":["23559163"],"is_preprint":false},{"year":2016,"finding":"Scn2b null mice exhibit reduced sodium and potassium current densities in ventricular myocytes and conduction slowing in the right ventricular outflow tract, with Nav1.5 protein levels unchanged, indicating that the primary function of β2 in the ventricle is to chaperone voltage-gated Na+ channel α-subunits to the plasma membrane. Scn2b deletion also causes atrial fibrillation susceptibility with increased fibrosis and higher repolarization dispersion.","method":"Whole-animal Scn2b knockout mouse model; patch-clamp electrophysiology, Western blot, in vivo electrophysiology studies","journal":"Circulation. Arrhythmia and electrophysiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic null mouse with multiple orthogonal electrophysiological and biochemical readouts, replicated across cardiac regions","pmids":["27932425"],"is_preprint":false},{"year":2008,"finding":"Loss of Na+ channel β2 subunits (Scn2b null mice) is neuroprotective in experimental allergic encephalomyelitis (EAE), reducing symptom severity, axonal degeneration, and axonal loss without compromising peripheral immune function, consistent with β2's role in regulating Na+ channel cell surface expression along demyelinated axons.","method":"EAE induction in Scn2b−/− and wild-type mice; histological assessment of axonal degeneration, immune cell infiltration assays, T cell proliferation and cytokine assays","journal":"Molecular and cellular neurosciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic null mouse model with multiple orthogonal outcome measures, single lab","pmids":["19013247"],"is_preprint":false},{"year":2011,"finding":"Post-transcriptional silencing of SCN2B (Navβ2) in ventricular cardiomyocytes increases late sodium current (INaL) density and slows its decay, an effect opposite to SCN1B silencing, demonstrating that β1 and β2 subunits exert oppositely directed modulation of INaL in both normal and failing dog hearts.","method":"siRNA knockdown via viral delivery, whole-cell and perforated patch-clamp in freshly isolated ventricular cardiomyocytes, RT-PCR and Western blot","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with >80% efficiency confirmed biochemically, patch-clamp electrophysiology, single lab, two species conditions (normal and HF)","pmids":["21705762"],"is_preprint":false},{"year":2010,"finding":"Scn2b null mice show that β2 subunits modify the pharmacological properties of Na+ channels: loss of β2 does not alter classical carbamazepine effects on transient Na+ current (INaT) use-dependent block or inactivation voltage dependence, but absence of β2 (along with β1) reveals a paradoxical CBZ-induced shift of INaP activation to hyperpolarized potentials, indicating β subunits shape antiepileptic drug sensitivity.","method":"Whole-cell patch-clamp in hippocampal neurons from Scn2b null and wild-type mice; current-clamp and computational modeling","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic null mice, patch-clamp with pharmacological manipulation, computational modeling, single lab","pmids":["20573896"],"is_preprint":false},{"year":2019,"finding":"N-linked glycosylation of the β2 subunit at residues Asn-42, Asn-66, and Asn-74 (sialylated only at Asn-42) is required for efficient β2 trafficking to the apical plasma membrane; fully nonglycosylated β2 is retained in the ER and is defective in promoting NaV1.5 cell surface localization, while a single intact glycosylation site restores this function.","method":"Heterologous expression in polarized MDCK cells; mutagenesis, glycosylation assays in vitro and in vivo, immunofluorescence, surface biotinylation, FRAP","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — site-directed mutagenesis with multiple glycosylation site variants, biochemical and cell biological readouts, functional NaV1.5 surface expression assay, single rigorous study with orthogonal methods","pmids":["31511323"],"is_preprint":false},{"year":2017,"finding":"The BrS-associated β2 mutation D211G reaches the plasma membrane normally but is defective in promoting Nav1.5 localization to the cell surface, demonstrating that β2 promotes Nav1.5 trafficking to the surface and that this function is disrupted by the D211G mutation.","method":"Immunofluorescence localization and cell surface assays in polarized MDCK cells and HL-1 cardiomyocyte-like cells","journal":"Biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two cell models tested, cell surface localization assays, single lab, mechanistically orthogonal to electrophysiology findings of same mutation","pmids":["28597987"],"is_preprint":false},{"year":2021,"finding":"The β2 subunit is S-acylated (palmitoylated) at Cys-182, and this modification promotes β2 association with cholesterol-rich lipid rafts and contributes to its polarized apical localization; depletion of plasma membrane cholesterol mislocalizes β2 to the basolateral domain. β2 palmitoylation is not required for promoting α subunit surface expression.","method":"Acyl-biotin exchange assay, mutagenesis (C182S), cholesterol depletion, detergent-resistant membrane fractionation, FRAP, immunofluorescence in polarized MDCK cells","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 / Strong — biochemical PTM identification, site-directed mutagenesis, lipid raft fractionation, live-cell FRAP, multiple orthogonal methods in one rigorous study","pmids":["33602743"],"is_preprint":false},{"year":2014,"finding":"The β2 subunit (SCN2B) functions as a cell adhesion molecule in prostate cancer cells: overexpression of β2 in weakly aggressive LNCaP cells enhances association with nerve axons, increases migration and invasion on laminin, and recombinant β2 ectodomain binds laminin directly in atomic force microscopy assays.","method":"β2 overexpression in LNCaP cells, ex vivo organotypic spinal cord co-culture, functional migration/invasion assays, atomic force microscopy binding assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal functional assays (migration, invasion, AFM binding), single lab","pmids":["24892658"],"is_preprint":false},{"year":2017,"finding":"Navβ2 (SCN2B) knockdown in APP/PS1 Alzheimer's disease mice partially reverses abnormal Navβ2 cleavage by BACE1, restores sodium current density in hippocampal neurons, and shifts APP processing towards non-amyloidogenic pathways, indicating that β2 is a substrate of BACE1 and that β2 levels modulate both Na+ channel surface expression and APP metabolism.","method":"Transgenic Navβ2 knockdown in APP/PS1 mice; EEG, patch-clamp, Morris water maze, Western blot, biochemical APP processing assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic knockdown in disease model, multiple orthogonal readouts (electrophysiology, behavior, biochemistry), single lab","pmids":["29245901"],"is_preprint":false},{"year":2019,"finding":"miR-449a regulates SCN2B expression by binding to the 3'-UTR seed region of SCN2B mRNA, as confirmed by dual-luciferase reporter assay and anti-Ago co-immunoprecipitation; overexpression of miR-449a or inhibition of SCN2B promotes hippocampal neuron extension in vitro.","method":"Dual-luciferase reporter assay, anti-Ago co-immunoprecipitation with Affymetrix microarray, miRNA microarray, neuronal morphology assay","journal":"International journal of molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dual-luciferase and Ago-RIP as orthogonal methods confirming miRNA targeting, single lab","pmids":["32124967"],"is_preprint":false},{"year":2019,"finding":"miR-34a targets the 3'-UTR of SCN2B mRNA in dorsal root ganglion neurons, confirmed by luciferase assay; miR-34a is downregulated in a rat model of chronic neuropathic pain, suggesting it is an upstream negative regulator of SCN2B expression in the peripheral nervous system.","method":"Luciferase 3'-UTR reporter assay, miRNA microarray, qPCR, ELISA","journal":"Neuroscience letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — luciferase assay confirms binding but SCN2B protein upregulation was non-significant; single lab, single functional validation method","pmids":["31278961"],"is_preprint":false},{"year":2018,"finding":"miR-133b-3p and miR-143-3p reduce expression from a reporter construct containing the 3'-UTR of Scn2b, and lentiviral delivery of these miRNAs reduces Scn2b mRNA in dorsal root ganglia; intrathecal injection prevents development of persistent mechanical and cold allodynia following peripheral nerve injury.","method":"3'-UTR luciferase reporter assay, lentiviral miRNA delivery, qPCR, behavioral pain assays in rats","journal":"Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — 3'-UTR reporter plus in vivo lentiviral knockdown with behavioral outcome, two miRNAs tested consistently, single lab","pmids":["30018017"],"is_preprint":false},{"year":2020,"finding":"SCN2B R137H mutation does not produce apparent functional effects on NaV1.5 gating by electrophysiology, but X-ray crystallography reveals structural changes in the β2 subunit. Structural mapping onto neuronal NaV channel structures suggests altered interaction patterns with non-cardiac NaV subtypes as a possible alternative mechanism.","method":"X-ray crystallography, whole-cell patch-clamp electrophysiology with NaV1.5","journal":"Bioelectricity","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — crystal structure plus electrophysiology, but NaV1.5 functional effect was negative/null; single lab, limited mechanistic resolution","pmids":["34476357"],"is_preprint":false},{"year":2023,"finding":"In a cell line devoid of all endogenous NaV β-subunits (BeHAPe cells), each β-subunit including β2 imparts unique gating properties to NaV1.5; combining β1 and β2 with NaV1.5 generates hybrid gating properties distinct from either subunit alone, demonstrating direct modulation of NaV1.5 gating by β2.","method":"CRISPR-engineered β-subunit-null human cell line, ectopic expression, whole-cell patch-clamp electrophysiology","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — rigorous isogenic cell line with all β-subunits knocked out, clean gain-of-function rescue experiment, multiple subunit combinations tested, direct electrophysiological readout","pmids":["37544648"],"is_preprint":false},{"year":2024,"finding":"The cytoplasmic tail, extracellular loop, and transmembrane domain of β2 are each required for proper β2 folding and export to the cell surface; loss or substantial alteration of any of these domains leads to ER accumulation and impaired complex N-glycosylation. β2 also forms homodimers. NaV1.5 does not influence β2 trafficking, surface localization, or homodimer formation, but β2 domain perturbations affect NaV1.5 surface localization.","method":"Domain deletion/mutation constructs expressed in polarized MDCK cells; immunofluorescence, surface biotinylation, glycosylation analysis, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — systematic mutagenesis across all β2 domains, multiple orthogonal biochemical and cell biological readouts, single rigorous study","pmids":["39343005"],"is_preprint":false},{"year":2024,"finding":"SCN2B expression increases in trigeminal ganglion neurons after chronic constriction injury of the infraorbital nerve; silencing SCN2B reduces pain hypersensitivity; miR-6954-3p is downregulated and directly targets the 3'-UTR of Scn2b mRNA (confirmed by luciferase assay), and intraganglionic delivery of miR-6954-3p agomir reduces SCN2B protein and increases pain threshold in CCI-ION mice.","method":"CCI-ION mouse model, siRNA knockdown, luciferase 3'-UTR assay, FISH, immunofluorescence, von Frey behavioral testing, Western blot, qRT-PCR","journal":"The journal of pain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockdown with behavioral readout plus luciferase confirmation of miRNA targeting, multiple orthogonal methods, single lab","pmids":["38866121"],"is_preprint":false}],"current_model":"SCN2B encodes the voltage-gated sodium channel β2 subunit, which covalently links to α-subunits via a single extracellular disulfide bond at Cys-26, chaperoning α-subunits (including NaV1.5 in heart and multiple α-subunits in neurons) to the plasma membrane through a trafficking pathway that requires N-linked glycosylation for ER export and S-palmitoylation at Cys-182 for lipid raft association and polarized apical localization; once at the surface, β2 directly modulates Na+ channel gating (promoting activation and late sodium current), opposes the inactivation-promoting effects of β1, and also functions as an immunoglobulin-domain cell adhesion molecule that interacts with extracellular matrix proteins such as laminin; loss-of-function mutations or deletion reduces cardiac and neuronal Na+ channel surface density causing arrhythmias and neuropathic changes, while β2 expression is itself post-transcriptionally regulated by miR-34a, miR-133b-3p, miR-143-3p, and miR-449a, and β2 is additionally a substrate of BACE1, linking it to Alzheimer's disease amyloid processing."},"narrative":{"mechanistic_narrative":"SCN2B encodes the voltage-gated sodium channel β2 subunit, an immunoglobulin-domain auxiliary protein that chaperones NaV α-subunits to the plasma membrane and directly modulates their gating [PMID:27932425, PMID:37544648]. β2 covalently links to α-subunits through a single extracellular disulfide bond at Cys-26 within its Ig domain; loss of this linkage (C26A) disrupts β2 targeting to nodes of Ranvier and the axon initial segment and abolishes its association with the neuronal cytoskeleton [PMID:22992729]. Correct surface delivery of β2 depends on its own biogenesis: the cytoplasmic tail, extracellular loop, and transmembrane domain are each required for folding and ER export, N-linked glycosylation at Asn-42/66/74 is needed for trafficking to the apical membrane, and S-acylation at Cys-182 promotes association with cholesterol-rich lipid rafts and polarized apical localization [PMID:31511323, PMID:33602743, PMID:39343005]. β2 also homodimerizes, and its trafficking is independent of NaV1.5 even though β2 perturbations impair NaV1.5 surface localization [PMID:39343005]. In an isogenic β-subunit-null background, β2 imparts distinct gating properties to NaV1.5 and, combined with β1, generates hybrid gating, while in neurons β2 normally promotes channel inactivation in opposition to β4 [PMID:37544648, PMID:19228957]; in heart, β2 chaperones NaV1.5 to the surface and oppositely modulates late sodium current relative to β1 [PMID:27932425, PMID:21705762]. Loss-of-function β2 mutations (R28Q/R28W, D211G) reduce sodium current density and NaV1.5 surface expression, linking SCN2B to atrial fibrillation and Brugada syndrome [PMID:19808477, PMID:23559163, PMID:28597987]. Beyond channel biology, β2 acts as a laminin-binding cell adhesion molecule promoting prostate cancer cell migration and invasion [PMID:24892658], and it is a BACE1 substrate whose cleavage couples β2 levels to APP processing in Alzheimer's disease models [PMID:29245901]. SCN2B expression is post-transcriptionally repressed by multiple microRNAs (miR-449a, miR-133b-3p, miR-143-3p, miR-6954-3p), with this regulation shaping neuronal outgrowth and neuropathic pain [PMID:32124967, PMID:30018017, PMID:38866121].","teleology":[{"year":2008,"claim":"Establishing whether β2 has a pathophysiological role in CNS disease, the finding that Scn2b deletion is neuroprotective tied β2 to Na+ channel surface regulation along demyelinated axons.","evidence":"EAE induction in Scn2b−/− mice with histological and immune readouts","pmids":["19013247"],"confidence":"Medium","gaps":["Did not resolve which axonal Na+ channels are affected","No direct molecular link between β2 loss and axonal protection"]},{"year":2009,"claim":"To test whether β2 loss-of-function contributes to human arrhythmia, R28Q/R28W mutants were shown to reduce SCN5A current and alter gating, implicating β2 in atrial fibrillation susceptibility.","evidence":"Heterologous coexpression in CHO cells with patch-clamp","pmids":["19808477"],"confidence":"Medium","gaps":["Mechanism (trafficking vs gating) not separated","Heterologous system only; no patient tissue"]},{"year":2009,"claim":"Clarifying how β-subunits balance channel kinetics, β2 was shown to normally promote inactivation, antagonizing β4 and modulating β1 effects.","evidence":"Whole-cell patch-clamp in neurons from Scn1b and Scn1b/Scn2b null mice","pmids":["19228957"],"confidence":"Medium","gaps":["Specific α-subunit partners not defined","Molecular basis of antagonism unresolved"]},{"year":2011,"claim":"Addressing whether β-subunits shape pathological late current, β2 silencing was found to increase INaL opposite to β1, defining divergent β1/β2 modulation in normal and failing hearts.","evidence":"siRNA knockdown and patch-clamp in isolated ventricular cardiomyocytes","pmids":["21705762"],"confidence":"Medium","gaps":["Direct vs indirect effect on INaL not distinguished","Structural basis of opposing modulation unknown"]},{"year":2012,"claim":"Defining the molecular basis of the α–β2 covalent linkage, Cys-26 was identified as the disulfide-bonding residue required for β2 targeting and cytoskeletal association.","evidence":"Site-directed mutagenesis, myelinating co-culture, neuron imaging, detergent extraction","pmids":["22992729"],"confidence":"High","gaps":["Cytoskeletal binding partner not identified","Which α-subunit cysteine pairs with Cys-26 not defined"]},{"year":2014,"claim":"Extending β2 function beyond ion channels, β2 was shown to act as a laminin-binding adhesion molecule driving cancer cell migration and invasion.","evidence":"β2 overexpression in LNCaP cells, organotypic co-culture, AFM laminin binding","pmids":["24892658"],"confidence":"Medium","gaps":["Adhesion signaling downstream of laminin binding unknown","In vivo relevance to prostate cancer not established"]},{"year":2017,"claim":"Resolving the mechanism of a Brugada mutation, D211G β2 was shown to reach the membrane normally but fail to promote NaV1.5 surface localization, separating β2 trafficking from chaperone function.","evidence":"Immunofluorescence and surface assays in MDCK and HL-1 cells","pmids":["28597987"],"confidence":"Medium","gaps":["Structural cause of chaperone failure not defined","Cell-line models, not cardiac tissue"]},{"year":2017,"claim":"Linking β2 to amyloid pathology, β2 was confirmed as a BACE1 substrate whose knockdown restores Na+ current and shifts APP processing toward non-amyloidogenic pathways.","evidence":"Nav β2 knockdown in APP/PS1 mice with electrophysiology, behavior, biochemistry","pmids":["29245901"],"confidence":"Medium","gaps":["Causal direction between β2 cleavage and APP processing unresolved","Cleavage fragment function not characterized"]},{"year":2016,"claim":"Establishing that β2 is the cardiac NaV1.5 chaperone, Scn2b null mice showed reduced ventricular current with unchanged NaV1.5 protein plus AF susceptibility, fibrosis and repolarization dispersion.","evidence":"Scn2b knockout mouse with patch-clamp, Western blot, in vivo electrophysiology","pmids":["27932425"],"confidence":"High","gaps":["Trafficking step controlled by β2 not pinpointed","Cause of K+ current reduction unexplained"]},{"year":2019,"claim":"Defining the trafficking requirement for chaperone function, N-glycosylation of β2 was shown to be required for apical surface delivery and promotion of NaV1.5 surface localization.","evidence":"Glycosylation site mutagenesis in polarized MDCK cells with biotinylation and FRAP","pmids":["31511323"],"confidence":"High","gaps":["Glycan recognition machinery for ER export unknown","Why a single site suffices not explained mechanistically"]},{"year":2021,"claim":"Identifying a lipid-based localization signal, β2 was shown to be palmitoylated at Cys-182, driving lipid raft association and apical polarity independent of its chaperone activity.","evidence":"Acyl-biotin exchange, C182S mutagenesis, cholesterol depletion, DRM fractionation, FRAP in MDCK cells","pmids":["33602743"],"confidence":"High","gaps":["Palmitoyl transferase not identified","Functional consequence of raft localization for channel signaling unknown"]},{"year":2023,"claim":"Demonstrating direct gating modulation, an isogenic β-subunit-null human cell line showed β2 confers unique NaV1.5 gating and hybrid properties with β1.","evidence":"CRISPR β-null (BeHAPe) cells with ectopic β-subunit expression and patch-clamp","pmids":["37544648"],"confidence":"High","gaps":["Structural interface mediating gating change not mapped","Endogenous stoichiometry not addressed"]},{"year":2024,"claim":"Mapping the determinants of β2 biogenesis, systematic domain perturbation showed all three β2 domains are required for folding and ER export, that β2 homodimerizes, and that β2 traffics independently of NaV1.5.","evidence":"Domain deletion constructs in MDCK cells with biotinylation, glycosylation, co-IP","pmids":["39343005"],"confidence":"High","gaps":["Functional role of β2 homodimers unknown","How β2 grabs NaV1.5 during co-trafficking unresolved"]},{"year":2024,"claim":"Consolidating microRNA control of β2, multiple miRNAs (miR-449a, miR-133b-3p/143-3p, miR-6954-3p) were shown to bind the SCN2B 3'-UTR and regulate neuronal outgrowth and neuropathic pain in vivo.","evidence":"Luciferase 3'-UTR reporters, Ago-RIP, lentiviral/agomir delivery, behavioral pain assays","pmids":["32124967","30018017","38866121"],"confidence":"Medium","gaps":["Combinatorial vs individual miRNA contributions unresolved","Upstream control of these miRNAs not defined"]},{"year":null,"claim":"How β2 physically engages the NaV α-subunit pore during co-trafficking and gating modulation, and the identity of its cytoskeletal and trafficking partners, remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structure of the β2–α complex defining the interaction interface","Cytoskeletal binding partner downstream of Cys-26 linkage unidentified","ER export receptor recognizing β2 glycans unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,17,1]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[11]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[2,4]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[8,9,10]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[8,18]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[1,2,7]},{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[4,6]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,3,12]}],"complexes":["voltage-gated sodium channel complex"],"partners":["SCN5A","SCN1B","BACE1","LAMININ"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O60939","full_name":"Sodium channel regulatory subunit beta-2","aliases":[],"length_aa":215,"mass_kda":24.3,"function":"Regulatory subunit of multiple voltage-gated sodium (Nav) channels directly mediating the depolarization of excitable membranes (PubMed:19808477, PubMed:23559163, PubMed:26894959, PubMed:30765605, PubMed:30765606, PubMed:35277491, PubMed:36823201). Navs, also called VGSCs (voltage-gated sodium channels) or VDSCs (voltage-dependent sodium channels), operate by switching between closed and open conformations depending on the voltage difference across the membrane. In the open conformation they allow Na(+) ions to selectively pass through the pore, along their electrochemical gradient. The influx of Na+ ions provokes membrane depolarization, initiating the propagation of electrical signals throughout cells and tissues (PubMed:19808477, PubMed:23559163, PubMed:26894959). The accessory beta subunits participate in localization and functional modulation of the Nav channels (PubMed:19808477, PubMed:23559163). Modulates the activity of SCN1A/Nav1.1, SCN2A/Nav1.2, SCN2A/Nav1.3, SCN5A/Nav1.5, SCN8A/Nav1.6, SCN9A/Nav1.7 and SCN10A/Nav1.8 (PubMed:19808477, PubMed:23559163, PubMed:26894959, PubMed:30765605, PubMed:30765606, PubMed:35277491, PubMed:36823201)","subcellular_location":"Cell membrane; Cell projection, axon","url":"https://www.uniprot.org/uniprotkb/O60939/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SCN2B","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SCN2B","total_profiled":1310},"omim":[{"mim_id":"615378","title":"ATRIAL FIBRILLATION, FAMILIAL, 14; ATFB14","url":"https://www.omim.org/entry/615378"},{"mim_id":"615377","title":"ATRIAL FIBRILLATION, FAMILIAL, 13; ATFB13","url":"https://www.omim.org/entry/615377"},{"mim_id":"611819","title":"LONG QT SYNDROME 10; LQT10","url":"https://www.omim.org/entry/611819"},{"mim_id":"608583","title":"ATRIAL FIBRILLATION, FAMILIAL, 1; ATFB1","url":"https://www.omim.org/entry/608583"},{"mim_id":"608256","title":"SODIUM VOLTAGE-GATED CHANNEL, BETA SUBUNIT 4; SCN4B","url":"https://www.omim.org/entry/608256"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":48.3}],"url":"https://www.proteinatlas.org/search/SCN2B"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"O60939","domains":[{"cath_id":"2.60.40.10","chopping":"31-146","consensus_level":"high","plddt":96.1161,"start":31,"end":146}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O60939","model_url":"https://alphafold.ebi.ac.uk/files/AF-O60939-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O60939-F1-predicted_aligned_error_v6.png","plddt_mean":85.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SCN2B","jax_strain_url":"https://www.jax.org/strain/search?query=SCN2B"},"sequence":{"accession":"O60939","fasta_url":"https://rest.uniprot.org/uniprotkb/O60939.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O60939/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O60939"}},"corpus_meta":[{"pmid":"19808477","id":"PMC_19808477","title":"Mutations in sodium channel β1- and β2-subunits associated with atrial fibrillation.","date":"2009","source":"Circulation. 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\"Circulation. Arrhythmia and electrophysiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct electrophysiological functional assay in heterologous system, single lab, two mutations tested with consistent results\",\n      \"pmids\": [\"19808477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In neurons from Scn2b null mice, β4-expressing cells showed slowed entry into inactivated states, demonstrating that β2 subunits normally promote Na+ channel inactivation; β1 and β4 have antagonistic roles on inactivation that are modulated by β2.\",\n      \"method\": \"Whole-cell patch-clamp in cultured hippocampal neurons from Scn1b and Scn1b/Scn2b null mice\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic null mouse combined with electrophysiology, single lab, multiple genotypes compared\",\n      \"pmids\": [\"19228957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"A single extracellular cysteine residue, Cys-26 within the immunoglobulin domain of β2, is responsible for the disulfide linkage between the Na+ channel α and β2 subunits; loss of this covalent linkage (C26A mutation) disrupts β2 targeting to nodes of Ranvier and the axon initial segment and prevents β2 association with the neuronal cytoskeleton.\",\n      \"method\": \"Mutagenesis of β2 cDNA constructs, myelinating co-culture system, primary hippocampal neuron imaging, Triton X-100 detergent extraction\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — site-directed mutagenesis combined with functional localization assays, multiple orthogonal methods (biochemical, cell imaging, detergent resistance) in one rigorous study\",\n      \"pmids\": [\"22992729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The Brugada syndrome-associated β2 missense mutation D211G reduces Nav1.5 sodium current density by ~39% without affecting unitary channel conductance; membrane protein detection experiments indicate the mutant decreases Nav1.5 cell surface expression.\",\n      \"method\": \"Patch-clamp electrophysiology (whole-cell and single-channel), cell surface biotinylation in heterologous expression system\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal methods (electrophysiology + surface biotinylation), single lab\",\n      \"pmids\": [\"23559163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Scn2b null mice exhibit reduced sodium and potassium current densities in ventricular myocytes and conduction slowing in the right ventricular outflow tract, with Nav1.5 protein levels unchanged, indicating that the primary function of β2 in the ventricle is to chaperone voltage-gated Na+ channel α-subunits to the plasma membrane. Scn2b deletion also causes atrial fibrillation susceptibility with increased fibrosis and higher repolarization dispersion.\",\n      \"method\": \"Whole-animal Scn2b knockout mouse model; patch-clamp electrophysiology, Western blot, in vivo electrophysiology studies\",\n      \"journal\": \"Circulation. Arrhythmia and electrophysiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic null mouse with multiple orthogonal electrophysiological and biochemical readouts, replicated across cardiac regions\",\n      \"pmids\": [\"27932425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Loss of Na+ channel β2 subunits (Scn2b null mice) is neuroprotective in experimental allergic encephalomyelitis (EAE), reducing symptom severity, axonal degeneration, and axonal loss without compromising peripheral immune function, consistent with β2's role in regulating Na+ channel cell surface expression along demyelinated axons.\",\n      \"method\": \"EAE induction in Scn2b−/− and wild-type mice; histological assessment of axonal degeneration, immune cell infiltration assays, T cell proliferation and cytokine assays\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic null mouse model with multiple orthogonal outcome measures, single lab\",\n      \"pmids\": [\"19013247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Post-transcriptional silencing of SCN2B (Navβ2) in ventricular cardiomyocytes increases late sodium current (INaL) density and slows its decay, an effect opposite to SCN1B silencing, demonstrating that β1 and β2 subunits exert oppositely directed modulation of INaL in both normal and failing dog hearts.\",\n      \"method\": \"siRNA knockdown via viral delivery, whole-cell and perforated patch-clamp in freshly isolated ventricular cardiomyocytes, RT-PCR and Western blot\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with >80% efficiency confirmed biochemically, patch-clamp electrophysiology, single lab, two species conditions (normal and HF)\",\n      \"pmids\": [\"21705762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Scn2b null mice show that β2 subunits modify the pharmacological properties of Na+ channels: loss of β2 does not alter classical carbamazepine effects on transient Na+ current (INaT) use-dependent block or inactivation voltage dependence, but absence of β2 (along with β1) reveals a paradoxical CBZ-induced shift of INaP activation to hyperpolarized potentials, indicating β subunits shape antiepileptic drug sensitivity.\",\n      \"method\": \"Whole-cell patch-clamp in hippocampal neurons from Scn2b null and wild-type mice; current-clamp and computational modeling\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic null mice, patch-clamp with pharmacological manipulation, computational modeling, single lab\",\n      \"pmids\": [\"20573896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"N-linked glycosylation of the β2 subunit at residues Asn-42, Asn-66, and Asn-74 (sialylated only at Asn-42) is required for efficient β2 trafficking to the apical plasma membrane; fully nonglycosylated β2 is retained in the ER and is defective in promoting NaV1.5 cell surface localization, while a single intact glycosylation site restores this function.\",\n      \"method\": \"Heterologous expression in polarized MDCK cells; mutagenesis, glycosylation assays in vitro and in vivo, immunofluorescence, surface biotinylation, FRAP\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — site-directed mutagenesis with multiple glycosylation site variants, biochemical and cell biological readouts, functional NaV1.5 surface expression assay, single rigorous study with orthogonal methods\",\n      \"pmids\": [\"31511323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The BrS-associated β2 mutation D211G reaches the plasma membrane normally but is defective in promoting Nav1.5 localization to the cell surface, demonstrating that β2 promotes Nav1.5 trafficking to the surface and that this function is disrupted by the D211G mutation.\",\n      \"method\": \"Immunofluorescence localization and cell surface assays in polarized MDCK cells and HL-1 cardiomyocyte-like cells\",\n      \"journal\": \"Biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two cell models tested, cell surface localization assays, single lab, mechanistically orthogonal to electrophysiology findings of same mutation\",\n      \"pmids\": [\"28597987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The β2 subunit is S-acylated (palmitoylated) at Cys-182, and this modification promotes β2 association with cholesterol-rich lipid rafts and contributes to its polarized apical localization; depletion of plasma membrane cholesterol mislocalizes β2 to the basolateral domain. β2 palmitoylation is not required for promoting α subunit surface expression.\",\n      \"method\": \"Acyl-biotin exchange assay, mutagenesis (C182S), cholesterol depletion, detergent-resistant membrane fractionation, FRAP, immunofluorescence in polarized MDCK cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — biochemical PTM identification, site-directed mutagenesis, lipid raft fractionation, live-cell FRAP, multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"33602743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The β2 subunit (SCN2B) functions as a cell adhesion molecule in prostate cancer cells: overexpression of β2 in weakly aggressive LNCaP cells enhances association with nerve axons, increases migration and invasion on laminin, and recombinant β2 ectodomain binds laminin directly in atomic force microscopy assays.\",\n      \"method\": \"β2 overexpression in LNCaP cells, ex vivo organotypic spinal cord co-culture, functional migration/invasion assays, atomic force microscopy binding assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal functional assays (migration, invasion, AFM binding), single lab\",\n      \"pmids\": [\"24892658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Navβ2 (SCN2B) knockdown in APP/PS1 Alzheimer's disease mice partially reverses abnormal Navβ2 cleavage by BACE1, restores sodium current density in hippocampal neurons, and shifts APP processing towards non-amyloidogenic pathways, indicating that β2 is a substrate of BACE1 and that β2 levels modulate both Na+ channel surface expression and APP metabolism.\",\n      \"method\": \"Transgenic Navβ2 knockdown in APP/PS1 mice; EEG, patch-clamp, Morris water maze, Western blot, biochemical APP processing assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic knockdown in disease model, multiple orthogonal readouts (electrophysiology, behavior, biochemistry), single lab\",\n      \"pmids\": [\"29245901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"miR-449a regulates SCN2B expression by binding to the 3'-UTR seed region of SCN2B mRNA, as confirmed by dual-luciferase reporter assay and anti-Ago co-immunoprecipitation; overexpression of miR-449a or inhibition of SCN2B promotes hippocampal neuron extension in vitro.\",\n      \"method\": \"Dual-luciferase reporter assay, anti-Ago co-immunoprecipitation with Affymetrix microarray, miRNA microarray, neuronal morphology assay\",\n      \"journal\": \"International journal of molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dual-luciferase and Ago-RIP as orthogonal methods confirming miRNA targeting, single lab\",\n      \"pmids\": [\"32124967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"miR-34a targets the 3'-UTR of SCN2B mRNA in dorsal root ganglion neurons, confirmed by luciferase assay; miR-34a is downregulated in a rat model of chronic neuropathic pain, suggesting it is an upstream negative regulator of SCN2B expression in the peripheral nervous system.\",\n      \"method\": \"Luciferase 3'-UTR reporter assay, miRNA microarray, qPCR, ELISA\",\n      \"journal\": \"Neuroscience letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — luciferase assay confirms binding but SCN2B protein upregulation was non-significant; single lab, single functional validation method\",\n      \"pmids\": [\"31278961\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"miR-133b-3p and miR-143-3p reduce expression from a reporter construct containing the 3'-UTR of Scn2b, and lentiviral delivery of these miRNAs reduces Scn2b mRNA in dorsal root ganglia; intrathecal injection prevents development of persistent mechanical and cold allodynia following peripheral nerve injury.\",\n      \"method\": \"3'-UTR luciferase reporter assay, lentiviral miRNA delivery, qPCR, behavioral pain assays in rats\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — 3'-UTR reporter plus in vivo lentiviral knockdown with behavioral outcome, two miRNAs tested consistently, single lab\",\n      \"pmids\": [\"30018017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SCN2B R137H mutation does not produce apparent functional effects on NaV1.5 gating by electrophysiology, but X-ray crystallography reveals structural changes in the β2 subunit. Structural mapping onto neuronal NaV channel structures suggests altered interaction patterns with non-cardiac NaV subtypes as a possible alternative mechanism.\",\n      \"method\": \"X-ray crystallography, whole-cell patch-clamp electrophysiology with NaV1.5\",\n      \"journal\": \"Bioelectricity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — crystal structure plus electrophysiology, but NaV1.5 functional effect was negative/null; single lab, limited mechanistic resolution\",\n      \"pmids\": [\"34476357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In a cell line devoid of all endogenous NaV β-subunits (BeHAPe cells), each β-subunit including β2 imparts unique gating properties to NaV1.5; combining β1 and β2 with NaV1.5 generates hybrid gating properties distinct from either subunit alone, demonstrating direct modulation of NaV1.5 gating by β2.\",\n      \"method\": \"CRISPR-engineered β-subunit-null human cell line, ectopic expression, whole-cell patch-clamp electrophysiology\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — rigorous isogenic cell line with all β-subunits knocked out, clean gain-of-function rescue experiment, multiple subunit combinations tested, direct electrophysiological readout\",\n      \"pmids\": [\"37544648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The cytoplasmic tail, extracellular loop, and transmembrane domain of β2 are each required for proper β2 folding and export to the cell surface; loss or substantial alteration of any of these domains leads to ER accumulation and impaired complex N-glycosylation. β2 also forms homodimers. NaV1.5 does not influence β2 trafficking, surface localization, or homodimer formation, but β2 domain perturbations affect NaV1.5 surface localization.\",\n      \"method\": \"Domain deletion/mutation constructs expressed in polarized MDCK cells; immunofluorescence, surface biotinylation, glycosylation analysis, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — systematic mutagenesis across all β2 domains, multiple orthogonal biochemical and cell biological readouts, single rigorous study\",\n      \"pmids\": [\"39343005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SCN2B expression increases in trigeminal ganglion neurons after chronic constriction injury of the infraorbital nerve; silencing SCN2B reduces pain hypersensitivity; miR-6954-3p is downregulated and directly targets the 3'-UTR of Scn2b mRNA (confirmed by luciferase assay), and intraganglionic delivery of miR-6954-3p agomir reduces SCN2B protein and increases pain threshold in CCI-ION mice.\",\n      \"method\": \"CCI-ION mouse model, siRNA knockdown, luciferase 3'-UTR assay, FISH, immunofluorescence, von Frey behavioral testing, Western blot, qRT-PCR\",\n      \"journal\": \"The journal of pain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockdown with behavioral readout plus luciferase confirmation of miRNA targeting, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"38866121\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SCN2B encodes the voltage-gated sodium channel β2 subunit, which covalently links to α-subunits via a single extracellular disulfide bond at Cys-26, chaperoning α-subunits (including NaV1.5 in heart and multiple α-subunits in neurons) to the plasma membrane through a trafficking pathway that requires N-linked glycosylation for ER export and S-palmitoylation at Cys-182 for lipid raft association and polarized apical localization; once at the surface, β2 directly modulates Na+ channel gating (promoting activation and late sodium current), opposes the inactivation-promoting effects of β1, and also functions as an immunoglobulin-domain cell adhesion molecule that interacts with extracellular matrix proteins such as laminin; loss-of-function mutations or deletion reduces cardiac and neuronal Na+ channel surface density causing arrhythmias and neuropathic changes, while β2 expression is itself post-transcriptionally regulated by miR-34a, miR-133b-3p, miR-143-3p, and miR-449a, and β2 is additionally a substrate of BACE1, linking it to Alzheimer's disease amyloid processing.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SCN2B encodes the voltage-gated sodium channel β2 subunit, an immunoglobulin-domain auxiliary protein that chaperones NaV α-subunits to the plasma membrane and directly modulates their gating [#4, #17]. β2 covalently links to α-subunits through a single extracellular disulfide bond at Cys-26 within its Ig domain; loss of this linkage (C26A) disrupts β2 targeting to nodes of Ranvier and the axon initial segment and abolishes its association with the neuronal cytoskeleton [#2]. Correct surface delivery of β2 depends on its own biogenesis: the cytoplasmic tail, extracellular loop, and transmembrane domain are each required for folding and ER export, N-linked glycosylation at Asn-42/66/74 is needed for trafficking to the apical membrane, and S-acylation at Cys-182 promotes association with cholesterol-rich lipid rafts and polarized apical localization [#8, #10, #18]. β2 also homodimerizes, and its trafficking is independent of NaV1.5 even though β2 perturbations impair NaV1.5 surface localization [#18]. In an isogenic β-subunit-null background, β2 imparts distinct gating properties to NaV1.5 and, combined with β1, generates hybrid gating, while in neurons β2 normally promotes channel inactivation in opposition to β4 [#17, #1]; in heart, β2 chaperones NaV1.5 to the surface and oppositely modulates late sodium current relative to β1 [#4, #6]. Loss-of-function β2 mutations (R28Q/R28W, D211G) reduce sodium current density and NaV1.5 surface expression, linking SCN2B to atrial fibrillation and Brugada syndrome [#0, #3, #9]. Beyond channel biology, β2 acts as a laminin-binding cell adhesion molecule promoting prostate cancer cell migration and invasion [#11], and it is a BACE1 substrate whose cleavage couples β2 levels to APP processing in Alzheimer's disease models [#12]. SCN2B expression is post-transcriptionally repressed by multiple microRNAs (miR-449a, miR-133b-3p, miR-143-3p, miR-6954-3p), with this regulation shaping neuronal outgrowth and neuropathic pain [#13, #15, #19].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Establishing whether β2 has a pathophysiological role in CNS disease, the finding that Scn2b deletion is neuroprotective tied β2 to Na+ channel surface regulation along demyelinated axons.\",\n      \"evidence\": \"EAE induction in Scn2b−/− mice with histological and immune readouts\",\n      \"pmids\": [\"19013247\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not resolve which axonal Na+ channels are affected\", \"No direct molecular link between β2 loss and axonal protection\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"To test whether β2 loss-of-function contributes to human arrhythmia, R28Q/R28W mutants were shown to reduce SCN5A current and alter gating, implicating β2 in atrial fibrillation susceptibility.\",\n      \"evidence\": \"Heterologous coexpression in CHO cells with patch-clamp\",\n      \"pmids\": [\"19808477\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism (trafficking vs gating) not separated\", \"Heterologous system only; no patient tissue\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Clarifying how β-subunits balance channel kinetics, β2 was shown to normally promote inactivation, antagonizing β4 and modulating β1 effects.\",\n      \"evidence\": \"Whole-cell patch-clamp in neurons from Scn1b and Scn1b/Scn2b null mice\",\n      \"pmids\": [\"19228957\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific α-subunit partners not defined\", \"Molecular basis of antagonism unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Addressing whether β-subunits shape pathological late current, β2 silencing was found to increase INaL opposite to β1, defining divergent β1/β2 modulation in normal and failing hearts.\",\n      \"evidence\": \"siRNA knockdown and patch-clamp in isolated ventricular cardiomyocytes\",\n      \"pmids\": [\"21705762\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect effect on INaL not distinguished\", \"Structural basis of opposing modulation unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defining the molecular basis of the α–β2 covalent linkage, Cys-26 was identified as the disulfide-bonding residue required for β2 targeting and cytoskeletal association.\",\n      \"evidence\": \"Site-directed mutagenesis, myelinating co-culture, neuron imaging, detergent extraction\",\n      \"pmids\": [\"22992729\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cytoskeletal binding partner not identified\", \"Which α-subunit cysteine pairs with Cys-26 not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extending β2 function beyond ion channels, β2 was shown to act as a laminin-binding adhesion molecule driving cancer cell migration and invasion.\",\n      \"evidence\": \"β2 overexpression in LNCaP cells, organotypic co-culture, AFM laminin binding\",\n      \"pmids\": [\"24892658\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Adhesion signaling downstream of laminin binding unknown\", \"In vivo relevance to prostate cancer not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Resolving the mechanism of a Brugada mutation, D211G β2 was shown to reach the membrane normally but fail to promote NaV1.5 surface localization, separating β2 trafficking from chaperone function.\",\n      \"evidence\": \"Immunofluorescence and surface assays in MDCK and HL-1 cells\",\n      \"pmids\": [\"28597987\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural cause of chaperone failure not defined\", \"Cell-line models, not cardiac tissue\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Linking β2 to amyloid pathology, β2 was confirmed as a BACE1 substrate whose knockdown restores Na+ current and shifts APP processing toward non-amyloidogenic pathways.\",\n      \"evidence\": \"Nav β2 knockdown in APP/PS1 mice with electrophysiology, behavior, biochemistry\",\n      \"pmids\": [\"29245901\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal direction between β2 cleavage and APP processing unresolved\", \"Cleavage fragment function not characterized\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Establishing that β2 is the cardiac NaV1.5 chaperone, Scn2b null mice showed reduced ventricular current with unchanged NaV1.5 protein plus AF susceptibility, fibrosis and repolarization dispersion.\",\n      \"evidence\": \"Scn2b knockout mouse with patch-clamp, Western blot, in vivo electrophysiology\",\n      \"pmids\": [\"27932425\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trafficking step controlled by β2 not pinpointed\", \"Cause of K+ current reduction unexplained\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defining the trafficking requirement for chaperone function, N-glycosylation of β2 was shown to be required for apical surface delivery and promotion of NaV1.5 surface localization.\",\n      \"evidence\": \"Glycosylation site mutagenesis in polarized MDCK cells with biotinylation and FRAP\",\n      \"pmids\": [\"31511323\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Glycan recognition machinery for ER export unknown\", \"Why a single site suffices not explained mechanistically\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identifying a lipid-based localization signal, β2 was shown to be palmitoylated at Cys-182, driving lipid raft association and apical polarity independent of its chaperone activity.\",\n      \"evidence\": \"Acyl-biotin exchange, C182S mutagenesis, cholesterol depletion, DRM fractionation, FRAP in MDCK cells\",\n      \"pmids\": [\"33602743\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Palmitoyl transferase not identified\", \"Functional consequence of raft localization for channel signaling unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrating direct gating modulation, an isogenic β-subunit-null human cell line showed β2 confers unique NaV1.5 gating and hybrid properties with β1.\",\n      \"evidence\": \"CRISPR β-null (BeHAPe) cells with ectopic β-subunit expression and patch-clamp\",\n      \"pmids\": [\"37544648\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural interface mediating gating change not mapped\", \"Endogenous stoichiometry not addressed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Mapping the determinants of β2 biogenesis, systematic domain perturbation showed all three β2 domains are required for folding and ER export, that β2 homodimerizes, and that β2 traffics independently of NaV1.5.\",\n      \"evidence\": \"Domain deletion constructs in MDCK cells with biotinylation, glycosylation, co-IP\",\n      \"pmids\": [\"39343005\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of β2 homodimers unknown\", \"How β2 grabs NaV1.5 during co-trafficking unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Consolidating microRNA control of β2, multiple miRNAs (miR-449a, miR-133b-3p/143-3p, miR-6954-3p) were shown to bind the SCN2B 3'-UTR and regulate neuronal outgrowth and neuropathic pain in vivo.\",\n      \"evidence\": \"Luciferase 3'-UTR reporters, Ago-RIP, lentiviral/agomir delivery, behavioral pain assays\",\n      \"pmids\": [\"32124967\", \"30018017\", \"38866121\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Combinatorial vs individual miRNA contributions unresolved\", \"Upstream control of these miRNAs not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How β2 physically engages the NaV α-subunit pore during co-trafficking and gating modulation, and the identity of its cytoskeletal and trafficking partners, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of the β2–α complex defining the interaction interface\", \"Cytoskeletal binding partner downstream of Cys-26 linkage unidentified\", \"ER export receptor recognizing β2 glycans unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 17, 1]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [11]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [2, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [8, 9, 10]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [8, 18]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [1, 2, 7]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [4, 6]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 3, 12]}\n    ],\n    \"complexes\": [\"voltage-gated sodium channel complex\"],\n    \"partners\": [\"SCN5A\", \"SCN1B\", \"BACE1\", \"laminin\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}