{"gene":"SNTA1","run_date":"2026-06-10T07:46:37","timeline":{"discoveries":[{"year":2008,"finding":"SNTA1 (α1-syntrophin) forms a macromolecular complex with neuronal nitric oxide synthase (nNOS), the nNOS inhibitor PMCA4b, and the cardiac sodium channel SCN5A, as demonstrated by GST-fusion pulldown using the C-terminus of SCN5A. The LQTS-associated missense mutation A390V-SNTA1 selectively disrupts binding of PMCA4b to this complex, releasing nNOS inhibition, causing increased S-nitrosylation of SCN5A, and increasing peak and late sodium current in heterologous cells and cardiac myocytes.","method":"GST-fusion protein pulldown, heterologous co-expression in HEK cells, whole-cell patch-clamp, nNOS inhibitor pharmacology, expression in cardiac myocytes","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1/2 / Strong — reconstitution of the macromolecular complex by pulldown, functional electrophysiology in two cell systems, pharmacological inhibition confirming nNOS dependence, single lab with multiple orthogonal methods","pmids":["18591664"],"is_preprint":false},{"year":2008,"finding":"The SNTA1 missense mutation A257G increases peak sodium current through Nav1.5 and causes a ~9.4 mV leftward shift in steady-state activation in both HEK-293 cells stably expressing hNav1.5 and neonatal rat cardiomyocytes, constituting a gain-of-function on the sodium channel consistent with LQT3-type dysfunction.","method":"Whole-cell patch-clamp electrophysiology in HEK-293 cells and neonatal rat cardiomyocytes transiently transfected with wild-type or mutant SNTA1","journal":"Circulation. Arrhythmia and electrophysiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology in two cell systems, single lab, no reconstitution of complex or structural validation","pmids":["19684871"],"is_preprint":false},{"year":2009,"finding":"Six SIDS-associated SNTA1 missense mutations (G54R, P56S, T262P, S287R, T372M, G460S) were identified; three of them (S287R, T372M, G460S), when co-expressed heterologously with SCN5A, nNOS, and PMCA4b in HEK293 cells, caused a significant 1.4–1.5-fold increase in peak INa and 2.3–2.7-fold increase in late INa that was reversed by an nNOS inhibitor, confirming that SNTA1 mutations increase sodium current through an nNOS-dependent mechanism.","method":"Heterologous co-expression in HEK293 cells with SCN5A, nNOS, and PMCA4b; whole-cell patch-clamp; nNOS inhibitor pharmacology","journal":"Circulation. Arrhythmia and electrophysiology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple mutations tested in reconstituted macromolecular complex with nNOS pharmacology confirming mechanism, independent replication of the nNOS-dependent mechanism established in PMID 18591664","pmids":["20009079"],"is_preprint":false},{"year":2013,"finding":"SNTA1 (α1-syntrophin) is a component of the caveolar SCN5A macromolecular complex together with nNOS and caveolin-3 (Cav3). The LQT9 mutation Cav3-F97C, in this complex, increases late INa and S-nitrosylation of SCN5A in an nNOS-dependent manner, confirming that SNTA1 participates in the nNOS-mediated S-nitrosylation regulatory pathway for the cardiac sodium channel.","method":"Heterologous co-expression of SCN5A, SNTA1, nNOS, and Cav3 in HEK-293 cells; whole-cell patch-clamp; biotin-switch assay for S-nitrosylation; nNOS inhibitor; adult rat cardiomyocyte expression with action potential recording","journal":"Journal of molecular and cellular cardiology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reconstitution of macromolecular complex, multiple orthogonal methods (electrophysiology, S-nitrosylation assay, pharmacology, cardiomyocytes), confirms prior SNTA1-nNOS mechanism","pmids":["23541953"],"is_preprint":false},{"year":2013,"finding":"Digenic mutations R800L-SCN5A and A261V-SNTA1 together cause a 5.6-fold increase in the late INa/peak INa ratio in HEK293 cells co-transfected with nNOS and PMCA4b, whereas either single mutation alone increases late INa only 2–3-fold. The combined gain-of-function was blocked by an nNOS inhibitor, demonstrating that SNTA1 and SCN5A mutations act jointly through the nNOS-dependent pathway.","method":"Heterologous co-expression in HEK293 cells with nNOS and PMCA4b; whole-cell patch-clamp; nNOS inhibitor pharmacology","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional electrophysiology with pharmacological confirmation in reconstituted complex; single lab, two mutations tested","pmids":["23376825"],"is_preprint":false},{"year":2011,"finding":"The SNTA1 intragenic polymorphism p.P74L reverses the pathogenic gain-of-function increase in peak INa and window current produced by the LQTS mutation p.A257G when both variants are present in the same SNTA1 protein, demonstrating intragenic rescue of sodium channel dysfunction.","method":"Heterologous co-expression of SCN5A with SNTA1 variants in HEK293 cells; whole-cell patch-clamp","journal":"Cardiogenetics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — functional electrophysiology with engineered intragenic rescue, single lab single method","pmids":["24319568"],"is_preprint":false},{"year":2014,"finding":"SNTA1 forms a novel signaling complex with P66shc and Grb2 in breast cancer cells. Overexpression of SNTA1 and P66shc activates Rac1 by displacing Sos1 from Grb2, shifting Sos1 to complex with Eps8 and E3b1, leading to increased ROS production and cell migration. Depletion of SNTA1 or P66shc reduces Rac1 activation, ROS, and migration.","method":"Co-immunoprecipitation, siRNA/shRNA knockdown, Rac1 activation assay (GST-PAK pulldown), in vitro wound healing and migration assays, ROS generation assay","journal":"British journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — reciprocal Co-IP plus functional assays with knockdown and overexpression; single lab, multiple methods","pmids":["24434436"],"is_preprint":false},{"year":2016,"finding":"Actin depolymerization (by cytochalasin D or latrunculin A) reduces tyrosine phosphorylation of SNTA1 and disrupts SNTA1–Rac1 interaction, thereby reducing Rac1 activation. This loss of SNTA1 phosphorylation and Rac1 activity leads to decreased ROS production, decreased cell migration, and increased apoptosis in breast cancer cells.","method":"Actin-depolymerizing drug treatment, western blot for tyrosine phosphorylation, co-immunoprecipitation of SNTA1-Rac1, Rac1 activation assay, migration assay, ROS assay, apoptosis assay","journal":"Apoptosis : an international journal on programmed cell death","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — multiple orthogonal assays establishing actin–SNTA1 phosphorylation–Rac1 axis; single lab","pmids":["27048259"],"is_preprint":false},{"year":2022,"finding":"In iPSC-derived cardiomyocytes from Duchenne Muscular Dystrophy (DMD) patients, loss of dystrophin reduces membrane-localized NaV1.5 and Kir2.1 protein levels, decreasing INa and IK1 currents. Transfection of α1-syntrophin (SNTA1) alone into DMD iPSC-CMs restored channelosome function, INa and IK1 densities, action potential profiles, impulse conduction, contractility, and prevented reentrant arrhythmias in monolayers, demonstrating that SNTA1 is essential for proper membrane localization of the NaV1.5-Kir2.1 channelosome.","method":"iPSC-CM generation from DMD patients, confocal microscopy of membrane protein localization, patch-clamp electrophysiology, non-viral piggyBac SNTA1 expression, optical mapping, contractility assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (localization, electrophysiology, optical mapping, contractility) in patient-derived cells, rescue by single gene re-expression; multiple patients tested","pmids":["35762211"],"is_preprint":false},{"year":2022,"finding":"CRISPR/Cas9 knockout of SNTA1 in human embryonic stem cell-derived cardiomyocytes causes hypertrophic phenotype, reduced cardiac contractility, weakened calcium transients, and lower sarcoplasmic reticulum calcium levels, indicating SNTA1 is required for normal calcium homeostasis in human cardiomyocytes. Early treatment with ranolazine (late INa blocker) partially rescued calcium handling.","method":"CRISPR-Cas9 knockout in H9 ESCs, differentiation to cardiomyocytes, calcium imaging, contractility assay, ranolazine pharmacology","journal":"Stem cell research & therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO with multiple phenotypic readouts and pharmacological rescue; single lab","pmids":["35773684"],"is_preprint":false},{"year":2025,"finding":"SNTA1 knockout in human embryonic stem cell-derived cardiomyocytes results in shorter field potential duration and slower conduction velocity as measured by microelectrode array, and immunofluorescence shows disorganized distribution of Nav1.5, establishing SNTA1 as essential for proper subcellular localization of Nav1.5 and normal electrical conduction in human cardiomyocytes.","method":"CRISPR-Cas9 knockout in human ESCs, 2D cardiomyocyte differentiation, microelectrode array analysis, immunofluorescence for Nav1.5 localization","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO with electrophysiological and localization readouts; single lab, two orthogonal methods","pmids":["40835660"],"is_preprint":false},{"year":2022,"finding":"SNTA1 forms a complex with p66Shc and RhoA in breast cancer cells. Overexpression of SNTA1 and p66Shc activates RhoA, increases ROS, promotes proliferation and migration. Actin depolymerization (cytochalasin D) disrupts SNTA1–p66Shc interaction and impairs F-actin organization, RhoA activation, ROS generation, proliferation, and migration.","method":"Co-immunoprecipitation, immunofluorescence, RhoA activation assay, actin depolymerization, MTT proliferation assay, transwell migration assay, wound healing assay, Amplex red ROS assay","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP plus multiple functional assays; single lab","pmids":["35273919"],"is_preprint":false},{"year":2024,"finding":"In neuroblastoma cells (IMR32), amyloid-β accumulation increases expression and activation of SNTA1 and MKK6. Activated MKK6 phosphorylates SNTA1, creating a binding site for Rac1, leading to Rac1 activation, ROS production, and G2/M cell cycle arrest.","method":"Western blot, immunoprecipitation, Rac1 activation assay, ROS assay, cell cycle analysis in IMR32 neuroblastoma cells treated with Aβ","journal":"The European journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP and activity assays with defined pathway in cell line model; single lab, multiple methods","pmids":["39543939"],"is_preprint":false},{"year":2024,"finding":"SNTA1 anchors AQP4 to astrocytic endfeet perivascularly. In Snta1 knockout mice, perivascular AQP4 localization is lost, CSF tracer influx and interstitial fluid efflux are slowed, and amyloid-β levels are increased. Snta1 KO had a more pronounced effect on Aβ plaque deposition than global Aqp4 KO, suggesting perivascular AQP4 localization is especially critical for Aβ clearance.","method":"Snta1 KO mouse model, CSF tracer injection and fluorescence imaging, AQP4 immunofluorescence, amyloid-β ELISA/plaque quantification","journal":"Neurobiology of disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with multiple functional readouts (tracer flux, Aβ levels); multiple independent labs confirmed AQP4 role (meta-analysis context)","pmids":["36990365"],"is_preprint":false},{"year":2018,"finding":"Snta1 knockout mice, which lack perivascular AQP4 localization, show significantly decreased CSF tracer influx compared to wild-type controls, establishing that SNTA1-dependent perivascular localization of AQP4 is required for normal glymphatic transport.","method":"Meta-analysis of five independent labs using Snta1 KO mice, CSF tracer injection and fluorescence imaging","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — consistent finding across five independent groups using Snta1 KO mice with tracer-based glymphatic functional assay","pmids":["30561329"],"is_preprint":false},{"year":2024,"finding":"SNTA1 silencing in cardiomyocytes exposed to diacetylmorphine activates the PI3K/AKT signaling pathway and worsens potassium channel disruption and mitochondrial dysfunction, whereas SNTA1 overexpression partially suppresses PI3K/AKT activation and ion channel abnormalities, indicating SNTA1 negatively regulates the PI3K/AKT pathway in the context of drug-induced arrhythmia.","method":"SNTA1 siRNA knockdown and overexpression in rat cardiomyocytes, tandem mass tag proteomics, western blot for PI3K/AKT pathway, mitochondrial function assays (JC-1, Seahorse), patch-clamp for potassium channels","journal":"Ecotoxicology and environmental safety","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, knockdown/overexpression with pathway readout but indirect mechanism and limited validation","pmids":["39437515"],"is_preprint":false},{"year":2021,"finding":"SNTA1 tyrosine phosphorylation (at Y215/229) is required for jasplakinolide-sensitive cell migration in MDA-MB-231 breast cancer cells; jasplakinolide treatment decreases SNTA1 protein levels and tyrosine phosphorylation, and a Y215/229 phospho-dead double mutant SNTA1 phenocopies jasplakinolide-mediated inhibition of migration.","method":"Jasplakinolide treatment, western blot for SNTA1 phosphorylation, transfection of WT and phospho-mutant SNTA1, Boyden chamber migration assay","journal":"The protein journal","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, phospho-mutant approach with migration assay, limited mechanistic detail in abstract","pmids":["33515365"],"is_preprint":false},{"year":2024,"finding":"miR-206-3p targets SNTA1 mRNA in denervated muscle; co-expression of miR-206 with Snta1 in C2C12 myoblasts significantly reduced SNTA1 protein levels, and overexpression of miR-206 in myotubes disrupted agrin-induced AChR clustering, indicating SNTA1 is a functional miR-206 target required for acetylcholine receptor clustering at the NMJ.","method":"miR-206 transfection in C2C12 myoblasts/myotubes, western blot for SNTA1 protein, AChR clustering assay","journal":"Journal of cell science","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, indirect mechanism (miRNA-mediated reduction of SNTA1 leads to AChR clustering defect), no direct SNTA1 rescue","pmids":["39575567"],"is_preprint":false}],"current_model":"SNTA1 (α1-syntrophin) is a scaffold/adaptor protein that organizes multiple macromolecular complexes: in cardiomyocytes it links nNOS, PMCA4b, and the cardiac sodium channel SCN5A (and Kir2.1) at the membrane, where it keeps nNOS tonically inhibited via PMCA4b so that SCN5A is not S-nitrosylated; loss-of-function or disease mutations disrupt PMCA4b binding, release nNOS, cause S-nitrosylation-dependent gain-of-function sodium current, and underlie long QT syndrome and arrhythmia susceptibility; in astrocytes SNTA1 anchors AQP4 to perivascular endfeet to support glymphatic CSF/ISF exchange and amyloid-β clearance; and in non-cardiac cells SNTA1 recruits P66shc and Grb2 to activate Rac1/RhoA signaling, ROS production, and cell migration through a tyrosine-phosphorylation-dependent mechanism linked to the actin cytoskeleton."},"narrative":{"mechanistic_narrative":"SNTA1 (α1-syntrophin) is a membrane-associated scaffold/adaptor that organizes ion channel and signaling complexes at the cell surface and underlies cardiac, neural, and migratory phenotypes [PMID:18591664, PMID:35762211, PMID:36990365]. In cardiomyocytes it assembles a macromolecular complex containing the cardiac sodium channel SCN5A (NaV1.5), neuronal nitric oxide synthase (nNOS), the nNOS inhibitor PMCA4b, and caveolin-3, in which PMCA4b holds nNOS tonically inhibited so that SCN5A is not S-nitrosylated [PMID:18591664, PMID:23541953]. Loss-of-function and disease-associated SNTA1 missense mutations selectively disrupt PMCA4b binding, releasing nNOS, increasing S-nitrosylation of SCN5A, and producing a gain-of-function increase in peak and late sodium current; this nNOS-dependent mechanism underlies long-QT-type dysfunction and sudden-death/SIDS-associated variants, and SNTA1 mutations can act jointly with SCN5A mutations in a digenic manner [PMID:18591664, PMID:20009079, PMID:23376825]. Beyond regulating channel gating, SNTA1 is required for proper membrane localization and organization of the NaV1.5–Kir2.1 channelosome and for normal cardiomyocyte calcium homeostasis, conduction, and contractility, and its re-expression rescues channelosome function in dystrophin-deficient cardiomyocytes [PMID:35762211, PMID:35773684, PMID:40835660]. In astrocytes SNTA1 anchors AQP4 at perivascular endfeet to support glymphatic CSF/interstitial-fluid exchange and amyloid-β clearance [PMID:36990365, PMID:30561329]. In non-cardiac cells SNTA1 acts as a phosphorylation-dependent signaling scaffold, recruiting P66shc and Grb2 to activate Rac1 (by displacing Sos1 from Grb2) and RhoA, driving ROS production and migration through an actin- and tyrosine-phosphorylation-dependent mechanism [PMID:24434436, PMID:27048259, PMID:35273919].","teleology":[{"year":2008,"claim":"Established the core cardiac mechanism: SNTA1 scaffolds SCN5A with nNOS and PMCA4b, and a disease mutation disrupting PMCA4b binding releases nNOS to S-nitrosylate the channel and increase sodium current, explaining how a non-channel scaffold causes an arrhythmia phenotype.","evidence":"GST-fusion pulldown reconstitution plus patch-clamp and nNOS pharmacology in HEK cells and cardiomyocytes","pmids":["18591664","19684871"],"confidence":"High","gaps":["No structural basis for PMCA4b/nNOS recruitment","In vivo arrhythmia consequence not directly demonstrated"]},{"year":2009,"claim":"Generalized the nNOS-dependent gain-of-function mechanism across multiple SIDS-associated SNTA1 mutations, showing reversibility by nNOS inhibition and confirming it is not idiosyncratic to one variant.","evidence":"Heterologous reconstitution of SCN5A/nNOS/PMCA4b complex, patch-clamp, nNOS inhibitor across six mutations","pmids":["20009079"],"confidence":"High","gaps":["Genotype-phenotype causality in patients not established","Why some mutations are functional and others silent unexplained"]},{"year":2013,"claim":"Extended the regulatory complex to include caveolin-3 and demonstrated digenic interaction with SCN5A mutations, embedding SNTA1 in a caveolar S-nitrosylation pathway and showing combinatorial disease risk.","evidence":"Reconstitution with Cav3, biotin-switch S-nitrosylation assay, patch-clamp, cardiomyocyte action potentials","pmids":["23541953","23376825"],"confidence":"High","gaps":["Stoichiometry and assembly order of the caveolar complex unknown","Native co-residence of all components not shown"]},{"year":2011,"claim":"Demonstrated intragenic rescue, showing the gain-of-function phenotype is a tunable property of the SNTA1 protein where a second variant can normalize channel current.","evidence":"Engineered intragenic variant co-expression with SCN5A and patch-clamp","pmids":["24319568"],"confidence":"Medium","gaps":["Single method, no complex reconstitution","Molecular basis of rescue not defined"]},{"year":2014,"claim":"Defined a distinct, non-cardiac role for SNTA1 as a signaling scaffold that recruits P66shc and Grb2 to activate Rac1 and drive migration, broadening SNTA1 function beyond ion-channel anchoring.","evidence":"Reciprocal Co-IP, knockdown/overexpression, Rac1 activation assay, migration and ROS assays in breast cancer cells","pmids":["24434436"],"confidence":"Medium","gaps":["Direct vs indirect SNTA1-P66shc binding not resolved","Single cell-context (breast cancer)"]},{"year":2016,"claim":"Linked SNTA1 signaling to the actin cytoskeleton, showing actin integrity sustains SNTA1 tyrosine phosphorylation that is required for the SNTA1–Rac1 interaction and downstream ROS, migration, and survival.","evidence":"Actin-depolymerizing drugs, phospho-western, Co-IP, Rac1/migration/ROS/apoptosis assays","pmids":["27048259"],"confidence":"Medium","gaps":["Kinase phosphorylating SNTA1 not identified here","Mechanism connecting actin to phosphorylation unclear"]},{"year":2022,"claim":"Showed SNTA1 is not merely a gating regulator but is required to localize the NaV1.5–Kir2.1 channelosome to the membrane and to maintain calcium homeostasis, with single-gene re-expression rescuing dystrophin-deficient cardiomyocytes.","evidence":"iPSC-CMs from DMD patients, confocal localization, patch-clamp, optical mapping, contractility; CRISPR KO in ESC-CMs with calcium imaging and ranolazine rescue","pmids":["35762211","35773684"],"confidence":"High","gaps":["Mechanism of SNTA1-dependent membrane trafficking not defined","Link between channelosome and calcium handling phenotypes incompletely connected"]},{"year":2022,"claim":"Identified a parallel RhoA arm of SNTA1/p66Shc signaling and reinforced the actin-dependence of these interactions, indicating SNTA1 coordinates multiple Rho-family outputs.","evidence":"Co-IP, RhoA activation assay, actin depolymerization, proliferation/migration/ROS assays in breast cancer cells","pmids":["35273919"],"confidence":"Medium","gaps":["How SNTA1 selects Rac1 vs RhoA output unknown","Single lab and cell type"]},{"year":2024,"claim":"Established SNTA1 as the anchor that places AQP4 at perivascular astrocyte endfeet, mechanistically connecting SNTA1 to glymphatic fluid transport and amyloid-β clearance.","evidence":"Snta1 KO mice with CSF tracer imaging, AQP4 immunofluorescence, and Aβ quantification; corroborated by cross-lab meta-analysis of KO glymphatic phenotype","pmids":["36990365","30561329"],"confidence":"High","gaps":["Molecular interface of SNTA1-AQP4 anchoring not resolved","Relevance to human neurodegeneration not directly tested"]},{"year":2024,"claim":"Connected the SNTA1/Rac1 signaling axis to a disease-relevant stimulus by showing amyloid-β drives MKK6-dependent SNTA1 phosphorylation that creates a Rac1 binding site, producing ROS and cell-cycle arrest in neuronal cells.","evidence":"Western blot, IP, Rac1 activation, ROS, and cell-cycle assays in Aβ-treated IMR32 cells","pmids":["39543939"],"confidence":"Medium","gaps":["Direct MKK6 phosphorylation of SNTA1 not biochemically confirmed","Single cell line"]},{"year":2024,"claim":"Provided ancillary regulatory and contextual findings (miR-206 targeting of SNTA1 in NMJ AChR clustering; SNTA1 negative regulation of PI3K/AKT in drug-induced arrhythmia; tyrosine Y215/229 phospho-sites for migration), expanding SNTA1's regulatory inputs.","evidence":"miR-206 transfection/AChR clustering in C2C12; siRNA/overexpression with proteomics and patch-clamp; phospho-dead mutant migration assays","pmids":["39575567","39437515","33515365"],"confidence":"Low","gaps":["Indirect, single-lab observations without rescue or reconstitution","Mechanistic links to core SNTA1 functions not established"]},{"year":null,"claim":"How SNTA1 structurally distinguishes and assembles its distinct complexes — the cardiac SCN5A/nNOS/PMCA4b/Cav3 channelosome, the astrocytic AQP4 anchor, and the migratory P66shc/Grb2/Rac1/RhoA scaffold — and what governs context-specific partner selection remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of SNTA1 in any complex","Determinants of tissue-specific partner choice unknown","In vivo cardiac arrhythmia mechanism not directly demonstrated for human mutations"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,6,8,13]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[7,11]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,2,3]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,8,13]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,11,12]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[13,14]},{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[8,9,10]}],"complexes":["SCN5A-nNOS-PMCA4b-caveolin-3 channelosome","NaV1.5-Kir2.1 channelosome","SNTA1-P66shc-Grb2 signaling complex"],"partners":["SCN5A","NNOS","PMCA4B","CAV3","AQP4","P66SHC","GRB2","RAC1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q13424","full_name":"Alpha-1-syntrophin","aliases":["59 kDa dystrophin-associated protein A1 acidic component 1","Pro-TGF-alpha cytoplasmic domain-interacting protein 1","TACIP1","Syntrophin-1"],"length_aa":505,"mass_kda":53.9,"function":"Adapter protein that binds to and probably organizes the subcellular localization of a variety of membrane proteins. May link various receptors to the actin cytoskeleton and the extracellular matrix via the dystrophin glycoprotein complex. Plays an important role in synapse formation and in the organization of UTRN and acetylcholine receptors at the neuromuscular synapse. Binds to phosphatidylinositol 4,5-bisphosphate (By similarity)","subcellular_location":"Cell membrane, sarcolemma; Cell junction; Cytoplasm, cytoskeleton","url":"https://www.uniprot.org/uniprotkb/Q13424/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SNTA1","classification":"Not Classified","n_dependent_lines":13,"n_total_lines":1208,"dependency_fraction":0.01076158940397351},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"UTRN","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/SNTA1","total_profiled":1310},"omim":[{"mim_id":"617128","title":"INHIBITORY SYNAPTIC FACTOR 1; INSYN1","url":"https://www.omim.org/entry/617128"},{"mim_id":"612955","title":"LONG QT SYNDROME 12; LQT12","url":"https://www.omim.org/entry/612955"},{"mim_id":"606845","title":"GOLGI-ASSOCIATED PDZ AND COILED-COIL DOMAINS-CONTAINING PROTEIN; GOPC","url":"https://www.omim.org/entry/606845"},{"mim_id":"604149","title":"SARCOGLYCAN, EPSILON; SGCE","url":"https://www.omim.org/entry/604149"},{"mim_id":"601599","title":"SARCOSPAN; SSPN","url":"https://www.omim.org/entry/601599"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"brain","ntpm":193.1},{"tissue":"heart muscle","ntpm":197.4},{"tissue":"skeletal muscle","ntpm":288.4},{"tissue":"tongue","ntpm":306.2}],"url":"https://www.proteinatlas.org/search/SNTA1"},"hgnc":{"alias_symbol":["TACIP1","LQT12"],"prev_symbol":["SNT1"]},"alphafold":{"accession":"Q13424","domains":[{"cath_id":"2.30.42.10","chopping":"87-169","consensus_level":"high","plddt":87.7633,"start":87,"end":169},{"cath_id":"2.30.29.30","chopping":"287-408","consensus_level":"medium","plddt":86.5057,"start":287,"end":408},{"cath_id":"2.30.29.30","chopping":"410-502","consensus_level":"high","plddt":91.8492,"start":410,"end":502}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13424","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q13424-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q13424-F1-predicted_aligned_error_v6.png","plddt_mean":78.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SNTA1","jax_strain_url":"https://www.jax.org/strain/search?query=SNTA1"},"sequence":{"accession":"Q13424","fasta_url":"https://rest.uniprot.org/uniprotkb/Q13424.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q13424/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13424"}},"corpus_meta":[{"pmid":"30561329","id":"PMC_30561329","title":"Aquaporin-4-dependent glymphatic solute transport in the rodent brain.","date":"2018","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/30561329","citation_count":577,"is_preprint":false},{"pmid":"31983240","id":"PMC_31983240","title":"An International, Multicentered, Evidence-Based Reappraisal of Genes Reported to Cause Congenital Long QT Syndrome.","date":"2020","source":"Circulation","url":"https://pubmed.ncbi.nlm.nih.gov/31983240","citation_count":294,"is_preprint":false},{"pmid":"18591664","id":"PMC_18591664","title":"Syntrophin mutation associated with long QT syndrome through activation of the nNOS-SCN5A macromolecular complex.","date":"2008","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/18591664","citation_count":241,"is_preprint":false},{"pmid":"35473943","id":"PMC_35473943","title":"Loss of perivascular aquaporin-4 localization impairs glymphatic exchange and promotes amyloid β plaque formation in mice.","date":"2022","source":"Alzheimer's research & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/35473943","citation_count":193,"is_preprint":false},{"pmid":"16427346","id":"PMC_16427346","title":"Genetic analysis in patients with left ventricular noncompaction and evidence for genetic heterogeneity.","date":"2006","source":"Molecular genetics and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/16427346","citation_count":143,"is_preprint":false},{"pmid":"19684871","id":"PMC_19684871","title":"alpha-1-syntrophin mutation and the long-QT syndrome: a disease of sodium channel disruption.","date":"2008","source":"Circulation. 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The LQTS-associated missense mutation A390V-SNTA1 selectively disrupts binding of PMCA4b to this complex, releasing nNOS inhibition, causing increased S-nitrosylation of SCN5A, and increasing peak and late sodium current in heterologous cells and cardiac myocytes.\",\n      \"method\": \"GST-fusion protein pulldown, heterologous co-expression in HEK cells, whole-cell patch-clamp, nNOS inhibitor pharmacology, expression in cardiac myocytes\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 / Strong — reconstitution of the macromolecular complex by pulldown, functional electrophysiology in two cell systems, pharmacological inhibition confirming nNOS dependence, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"18591664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The SNTA1 missense mutation A257G increases peak sodium current through Nav1.5 and causes a ~9.4 mV leftward shift in steady-state activation in both HEK-293 cells stably expressing hNav1.5 and neonatal rat cardiomyocytes, constituting a gain-of-function on the sodium channel consistent with LQT3-type dysfunction.\",\n      \"method\": \"Whole-cell patch-clamp electrophysiology in HEK-293 cells and neonatal rat cardiomyocytes transiently transfected with wild-type or mutant SNTA1\",\n      \"journal\": \"Circulation. Arrhythmia and electrophysiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology in two cell systems, single lab, no reconstitution of complex or structural validation\",\n      \"pmids\": [\"19684871\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Six SIDS-associated SNTA1 missense mutations (G54R, P56S, T262P, S287R, T372M, G460S) were identified; three of them (S287R, T372M, G460S), when co-expressed heterologously with SCN5A, nNOS, and PMCA4b in HEK293 cells, caused a significant 1.4–1.5-fold increase in peak INa and 2.3–2.7-fold increase in late INa that was reversed by an nNOS inhibitor, confirming that SNTA1 mutations increase sodium current through an nNOS-dependent mechanism.\",\n      \"method\": \"Heterologous co-expression in HEK293 cells with SCN5A, nNOS, and PMCA4b; whole-cell patch-clamp; nNOS inhibitor pharmacology\",\n      \"journal\": \"Circulation. Arrhythmia and electrophysiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple mutations tested in reconstituted macromolecular complex with nNOS pharmacology confirming mechanism, independent replication of the nNOS-dependent mechanism established in PMID 18591664\",\n      \"pmids\": [\"20009079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SNTA1 (α1-syntrophin) is a component of the caveolar SCN5A macromolecular complex together with nNOS and caveolin-3 (Cav3). The LQT9 mutation Cav3-F97C, in this complex, increases late INa and S-nitrosylation of SCN5A in an nNOS-dependent manner, confirming that SNTA1 participates in the nNOS-mediated S-nitrosylation regulatory pathway for the cardiac sodium channel.\",\n      \"method\": \"Heterologous co-expression of SCN5A, SNTA1, nNOS, and Cav3 in HEK-293 cells; whole-cell patch-clamp; biotin-switch assay for S-nitrosylation; nNOS inhibitor; adult rat cardiomyocyte expression with action potential recording\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reconstitution of macromolecular complex, multiple orthogonal methods (electrophysiology, S-nitrosylation assay, pharmacology, cardiomyocytes), confirms prior SNTA1-nNOS mechanism\",\n      \"pmids\": [\"23541953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Digenic mutations R800L-SCN5A and A261V-SNTA1 together cause a 5.6-fold increase in the late INa/peak INa ratio in HEK293 cells co-transfected with nNOS and PMCA4b, whereas either single mutation alone increases late INa only 2–3-fold. The combined gain-of-function was blocked by an nNOS inhibitor, demonstrating that SNTA1 and SCN5A mutations act jointly through the nNOS-dependent pathway.\",\n      \"method\": \"Heterologous co-expression in HEK293 cells with nNOS and PMCA4b; whole-cell patch-clamp; nNOS inhibitor pharmacology\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional electrophysiology with pharmacological confirmation in reconstituted complex; single lab, two mutations tested\",\n      \"pmids\": [\"23376825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The SNTA1 intragenic polymorphism p.P74L reverses the pathogenic gain-of-function increase in peak INa and window current produced by the LQTS mutation p.A257G when both variants are present in the same SNTA1 protein, demonstrating intragenic rescue of sodium channel dysfunction.\",\n      \"method\": \"Heterologous co-expression of SCN5A with SNTA1 variants in HEK293 cells; whole-cell patch-clamp\",\n      \"journal\": \"Cardiogenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — functional electrophysiology with engineered intragenic rescue, single lab single method\",\n      \"pmids\": [\"24319568\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SNTA1 forms a novel signaling complex with P66shc and Grb2 in breast cancer cells. Overexpression of SNTA1 and P66shc activates Rac1 by displacing Sos1 from Grb2, shifting Sos1 to complex with Eps8 and E3b1, leading to increased ROS production and cell migration. Depletion of SNTA1 or P66shc reduces Rac1 activation, ROS, and migration.\",\n      \"method\": \"Co-immunoprecipitation, siRNA/shRNA knockdown, Rac1 activation assay (GST-PAK pulldown), in vitro wound healing and migration assays, ROS generation assay\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — reciprocal Co-IP plus functional assays with knockdown and overexpression; single lab, multiple methods\",\n      \"pmids\": [\"24434436\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Actin depolymerization (by cytochalasin D or latrunculin A) reduces tyrosine phosphorylation of SNTA1 and disrupts SNTA1–Rac1 interaction, thereby reducing Rac1 activation. This loss of SNTA1 phosphorylation and Rac1 activity leads to decreased ROS production, decreased cell migration, and increased apoptosis in breast cancer cells.\",\n      \"method\": \"Actin-depolymerizing drug treatment, western blot for tyrosine phosphorylation, co-immunoprecipitation of SNTA1-Rac1, Rac1 activation assay, migration assay, ROS assay, apoptosis assay\",\n      \"journal\": \"Apoptosis : an international journal on programmed cell death\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — multiple orthogonal assays establishing actin–SNTA1 phosphorylation–Rac1 axis; single lab\",\n      \"pmids\": [\"27048259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In iPSC-derived cardiomyocytes from Duchenne Muscular Dystrophy (DMD) patients, loss of dystrophin reduces membrane-localized NaV1.5 and Kir2.1 protein levels, decreasing INa and IK1 currents. Transfection of α1-syntrophin (SNTA1) alone into DMD iPSC-CMs restored channelosome function, INa and IK1 densities, action potential profiles, impulse conduction, contractility, and prevented reentrant arrhythmias in monolayers, demonstrating that SNTA1 is essential for proper membrane localization of the NaV1.5-Kir2.1 channelosome.\",\n      \"method\": \"iPSC-CM generation from DMD patients, confocal microscopy of membrane protein localization, patch-clamp electrophysiology, non-viral piggyBac SNTA1 expression, optical mapping, contractility assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (localization, electrophysiology, optical mapping, contractility) in patient-derived cells, rescue by single gene re-expression; multiple patients tested\",\n      \"pmids\": [\"35762211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CRISPR/Cas9 knockout of SNTA1 in human embryonic stem cell-derived cardiomyocytes causes hypertrophic phenotype, reduced cardiac contractility, weakened calcium transients, and lower sarcoplasmic reticulum calcium levels, indicating SNTA1 is required for normal calcium homeostasis in human cardiomyocytes. Early treatment with ranolazine (late INa blocker) partially rescued calcium handling.\",\n      \"method\": \"CRISPR-Cas9 knockout in H9 ESCs, differentiation to cardiomyocytes, calcium imaging, contractility assay, ranolazine pharmacology\",\n      \"journal\": \"Stem cell research & therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO with multiple phenotypic readouts and pharmacological rescue; single lab\",\n      \"pmids\": [\"35773684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SNTA1 knockout in human embryonic stem cell-derived cardiomyocytes results in shorter field potential duration and slower conduction velocity as measured by microelectrode array, and immunofluorescence shows disorganized distribution of Nav1.5, establishing SNTA1 as essential for proper subcellular localization of Nav1.5 and normal electrical conduction in human cardiomyocytes.\",\n      \"method\": \"CRISPR-Cas9 knockout in human ESCs, 2D cardiomyocyte differentiation, microelectrode array analysis, immunofluorescence for Nav1.5 localization\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO with electrophysiological and localization readouts; single lab, two orthogonal methods\",\n      \"pmids\": [\"40835660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SNTA1 forms a complex with p66Shc and RhoA in breast cancer cells. Overexpression of SNTA1 and p66Shc activates RhoA, increases ROS, promotes proliferation and migration. Actin depolymerization (cytochalasin D) disrupts SNTA1–p66Shc interaction and impairs F-actin organization, RhoA activation, ROS generation, proliferation, and migration.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, RhoA activation assay, actin depolymerization, MTT proliferation assay, transwell migration assay, wound healing assay, Amplex red ROS assay\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP plus multiple functional assays; single lab\",\n      \"pmids\": [\"35273919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In neuroblastoma cells (IMR32), amyloid-β accumulation increases expression and activation of SNTA1 and MKK6. Activated MKK6 phosphorylates SNTA1, creating a binding site for Rac1, leading to Rac1 activation, ROS production, and G2/M cell cycle arrest.\",\n      \"method\": \"Western blot, immunoprecipitation, Rac1 activation assay, ROS assay, cell cycle analysis in IMR32 neuroblastoma cells treated with Aβ\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP and activity assays with defined pathway in cell line model; single lab, multiple methods\",\n      \"pmids\": [\"39543939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SNTA1 anchors AQP4 to astrocytic endfeet perivascularly. In Snta1 knockout mice, perivascular AQP4 localization is lost, CSF tracer influx and interstitial fluid efflux are slowed, and amyloid-β levels are increased. Snta1 KO had a more pronounced effect on Aβ plaque deposition than global Aqp4 KO, suggesting perivascular AQP4 localization is especially critical for Aβ clearance.\",\n      \"method\": \"Snta1 KO mouse model, CSF tracer injection and fluorescence imaging, AQP4 immunofluorescence, amyloid-β ELISA/plaque quantification\",\n      \"journal\": \"Neurobiology of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with multiple functional readouts (tracer flux, Aβ levels); multiple independent labs confirmed AQP4 role (meta-analysis context)\",\n      \"pmids\": [\"36990365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Snta1 knockout mice, which lack perivascular AQP4 localization, show significantly decreased CSF tracer influx compared to wild-type controls, establishing that SNTA1-dependent perivascular localization of AQP4 is required for normal glymphatic transport.\",\n      \"method\": \"Meta-analysis of five independent labs using Snta1 KO mice, CSF tracer injection and fluorescence imaging\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — consistent finding across five independent groups using Snta1 KO mice with tracer-based glymphatic functional assay\",\n      \"pmids\": [\"30561329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SNTA1 silencing in cardiomyocytes exposed to diacetylmorphine activates the PI3K/AKT signaling pathway and worsens potassium channel disruption and mitochondrial dysfunction, whereas SNTA1 overexpression partially suppresses PI3K/AKT activation and ion channel abnormalities, indicating SNTA1 negatively regulates the PI3K/AKT pathway in the context of drug-induced arrhythmia.\",\n      \"method\": \"SNTA1 siRNA knockdown and overexpression in rat cardiomyocytes, tandem mass tag proteomics, western blot for PI3K/AKT pathway, mitochondrial function assays (JC-1, Seahorse), patch-clamp for potassium channels\",\n      \"journal\": \"Ecotoxicology and environmental safety\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, knockdown/overexpression with pathway readout but indirect mechanism and limited validation\",\n      \"pmids\": [\"39437515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SNTA1 tyrosine phosphorylation (at Y215/229) is required for jasplakinolide-sensitive cell migration in MDA-MB-231 breast cancer cells; jasplakinolide treatment decreases SNTA1 protein levels and tyrosine phosphorylation, and a Y215/229 phospho-dead double mutant SNTA1 phenocopies jasplakinolide-mediated inhibition of migration.\",\n      \"method\": \"Jasplakinolide treatment, western blot for SNTA1 phosphorylation, transfection of WT and phospho-mutant SNTA1, Boyden chamber migration assay\",\n      \"journal\": \"The protein journal\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, phospho-mutant approach with migration assay, limited mechanistic detail in abstract\",\n      \"pmids\": [\"33515365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"miR-206-3p targets SNTA1 mRNA in denervated muscle; co-expression of miR-206 with Snta1 in C2C12 myoblasts significantly reduced SNTA1 protein levels, and overexpression of miR-206 in myotubes disrupted agrin-induced AChR clustering, indicating SNTA1 is a functional miR-206 target required for acetylcholine receptor clustering at the NMJ.\",\n      \"method\": \"miR-206 transfection in C2C12 myoblasts/myotubes, western blot for SNTA1 protein, AChR clustering assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, indirect mechanism (miRNA-mediated reduction of SNTA1 leads to AChR clustering defect), no direct SNTA1 rescue\",\n      \"pmids\": [\"39575567\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SNTA1 (α1-syntrophin) is a scaffold/adaptor protein that organizes multiple macromolecular complexes: in cardiomyocytes it links nNOS, PMCA4b, and the cardiac sodium channel SCN5A (and Kir2.1) at the membrane, where it keeps nNOS tonically inhibited via PMCA4b so that SCN5A is not S-nitrosylated; loss-of-function or disease mutations disrupt PMCA4b binding, release nNOS, cause S-nitrosylation-dependent gain-of-function sodium current, and underlie long QT syndrome and arrhythmia susceptibility; in astrocytes SNTA1 anchors AQP4 to perivascular endfeet to support glymphatic CSF/ISF exchange and amyloid-β clearance; and in non-cardiac cells SNTA1 recruits P66shc and Grb2 to activate Rac1/RhoA signaling, ROS production, and cell migration through a tyrosine-phosphorylation-dependent mechanism linked to the actin cytoskeleton.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SNTA1 (α1-syntrophin) is a membrane-associated scaffold/adaptor that organizes ion channel and signaling complexes at the cell surface and underlies cardiac, neural, and migratory phenotypes [#0, #8, #13]. In cardiomyocytes it assembles a macromolecular complex containing the cardiac sodium channel SCN5A (NaV1.5), neuronal nitric oxide synthase (nNOS), the nNOS inhibitor PMCA4b, and caveolin-3, in which PMCA4b holds nNOS tonically inhibited so that SCN5A is not S-nitrosylated [#0, #3]. Loss-of-function and disease-associated SNTA1 missense mutations selectively disrupt PMCA4b binding, releasing nNOS, increasing S-nitrosylation of SCN5A, and producing a gain-of-function increase in peak and late sodium current; this nNOS-dependent mechanism underlies long-QT-type dysfunction and sudden-death/SIDS-associated variants, and SNTA1 mutations can act jointly with SCN5A mutations in a digenic manner [#0, #2, #4]. Beyond regulating channel gating, SNTA1 is required for proper membrane localization and organization of the NaV1.5–Kir2.1 channelosome and for normal cardiomyocyte calcium homeostasis, conduction, and contractility, and its re-expression rescues channelosome function in dystrophin-deficient cardiomyocytes [#8, #9, #10]. In astrocytes SNTA1 anchors AQP4 at perivascular endfeet to support glymphatic CSF/interstitial-fluid exchange and amyloid-β clearance [#13, #14]. In non-cardiac cells SNTA1 acts as a phosphorylation-dependent signaling scaffold, recruiting P66shc and Grb2 to activate Rac1 (by displacing Sos1 from Grb2) and RhoA, driving ROS production and migration through an actin- and tyrosine-phosphorylation-dependent mechanism [#6, #7, #11].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established the core cardiac mechanism: SNTA1 scaffolds SCN5A with nNOS and PMCA4b, and a disease mutation disrupting PMCA4b binding releases nNOS to S-nitrosylate the channel and increase sodium current, explaining how a non-channel scaffold causes an arrhythmia phenotype.\",\n      \"evidence\": \"GST-fusion pulldown reconstitution plus patch-clamp and nNOS pharmacology in HEK cells and cardiomyocytes\",\n      \"pmids\": [\"18591664\", \"19684871\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural basis for PMCA4b/nNOS recruitment\", \"In vivo arrhythmia consequence not directly demonstrated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Generalized the nNOS-dependent gain-of-function mechanism across multiple SIDS-associated SNTA1 mutations, showing reversibility by nNOS inhibition and confirming it is not idiosyncratic to one variant.\",\n      \"evidence\": \"Heterologous reconstitution of SCN5A/nNOS/PMCA4b complex, patch-clamp, nNOS inhibitor across six mutations\",\n      \"pmids\": [\"20009079\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genotype-phenotype causality in patients not established\", \"Why some mutations are functional and others silent unexplained\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Extended the regulatory complex to include caveolin-3 and demonstrated digenic interaction with SCN5A mutations, embedding SNTA1 in a caveolar S-nitrosylation pathway and showing combinatorial disease risk.\",\n      \"evidence\": \"Reconstitution with Cav3, biotin-switch S-nitrosylation assay, patch-clamp, cardiomyocyte action potentials\",\n      \"pmids\": [\"23541953\", \"23376825\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and assembly order of the caveolar complex unknown\", \"Native co-residence of all components not shown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated intragenic rescue, showing the gain-of-function phenotype is a tunable property of the SNTA1 protein where a second variant can normalize channel current.\",\n      \"evidence\": \"Engineered intragenic variant co-expression with SCN5A and patch-clamp\",\n      \"pmids\": [\"24319568\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single method, no complex reconstitution\", \"Molecular basis of rescue not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined a distinct, non-cardiac role for SNTA1 as a signaling scaffold that recruits P66shc and Grb2 to activate Rac1 and drive migration, broadening SNTA1 function beyond ion-channel anchoring.\",\n      \"evidence\": \"Reciprocal Co-IP, knockdown/overexpression, Rac1 activation assay, migration and ROS assays in breast cancer cells\",\n      \"pmids\": [\"24434436\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect SNTA1-P66shc binding not resolved\", \"Single cell-context (breast cancer)\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Linked SNTA1 signaling to the actin cytoskeleton, showing actin integrity sustains SNTA1 tyrosine phosphorylation that is required for the SNTA1–Rac1 interaction and downstream ROS, migration, and survival.\",\n      \"evidence\": \"Actin-depolymerizing drugs, phospho-western, Co-IP, Rac1/migration/ROS/apoptosis assays\",\n      \"pmids\": [\"27048259\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Kinase phosphorylating SNTA1 not identified here\", \"Mechanism connecting actin to phosphorylation unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed SNTA1 is not merely a gating regulator but is required to localize the NaV1.5–Kir2.1 channelosome to the membrane and to maintain calcium homeostasis, with single-gene re-expression rescuing dystrophin-deficient cardiomyocytes.\",\n      \"evidence\": \"iPSC-CMs from DMD patients, confocal localization, patch-clamp, optical mapping, contractility; CRISPR KO in ESC-CMs with calcium imaging and ranolazine rescue\",\n      \"pmids\": [\"35762211\", \"35773684\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of SNTA1-dependent membrane trafficking not defined\", \"Link between channelosome and calcium handling phenotypes incompletely connected\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified a parallel RhoA arm of SNTA1/p66Shc signaling and reinforced the actin-dependence of these interactions, indicating SNTA1 coordinates multiple Rho-family outputs.\",\n      \"evidence\": \"Co-IP, RhoA activation assay, actin depolymerization, proliferation/migration/ROS assays in breast cancer cells\",\n      \"pmids\": [\"35273919\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How SNTA1 selects Rac1 vs RhoA output unknown\", \"Single lab and cell type\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established SNTA1 as the anchor that places AQP4 at perivascular astrocyte endfeet, mechanistically connecting SNTA1 to glymphatic fluid transport and amyloid-β clearance.\",\n      \"evidence\": \"Snta1 KO mice with CSF tracer imaging, AQP4 immunofluorescence, and Aβ quantification; corroborated by cross-lab meta-analysis of KO glymphatic phenotype\",\n      \"pmids\": [\"36990365\", \"30561329\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular interface of SNTA1-AQP4 anchoring not resolved\", \"Relevance to human neurodegeneration not directly tested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Connected the SNTA1/Rac1 signaling axis to a disease-relevant stimulus by showing amyloid-β drives MKK6-dependent SNTA1 phosphorylation that creates a Rac1 binding site, producing ROS and cell-cycle arrest in neuronal cells.\",\n      \"evidence\": \"Western blot, IP, Rac1 activation, ROS, and cell-cycle assays in Aβ-treated IMR32 cells\",\n      \"pmids\": [\"39543939\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct MKK6 phosphorylation of SNTA1 not biochemically confirmed\", \"Single cell line\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Provided ancillary regulatory and contextual findings (miR-206 targeting of SNTA1 in NMJ AChR clustering; SNTA1 negative regulation of PI3K/AKT in drug-induced arrhythmia; tyrosine Y215/229 phospho-sites for migration), expanding SNTA1's regulatory inputs.\",\n      \"evidence\": \"miR-206 transfection/AChR clustering in C2C12; siRNA/overexpression with proteomics and patch-clamp; phospho-dead mutant migration assays\",\n      \"pmids\": [\"39575567\", \"39437515\", \"33515365\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Indirect, single-lab observations without rescue or reconstitution\", \"Mechanistic links to core SNTA1 functions not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How SNTA1 structurally distinguishes and assembles its distinct complexes — the cardiac SCN5A/nNOS/PMCA4b/Cav3 channelosome, the astrocytic AQP4 anchor, and the migratory P66shc/Grb2/Rac1/RhoA scaffold — and what governs context-specific partner selection remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of SNTA1 in any complex\", \"Determinants of tissue-specific partner choice unknown\", \"In vivo cardiac arrhythmia mechanism not directly demonstrated for human mutations\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 6, 8, 13]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [7, 11]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 8, 13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 11, 12]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [13, 14]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [8, 9, 10]}\n    ],\n    \"complexes\": [\n      \"SCN5A-nNOS-PMCA4b-caveolin-3 channelosome\",\n      \"NaV1.5-Kir2.1 channelosome\",\n      \"SNTA1-P66shc-Grb2 signaling complex\"\n    ],\n    \"partners\": [\n      \"SCN5A\",\n      \"nNOS\",\n      \"PMCA4b\",\n      \"CAV3\",\n      \"AQP4\",\n      \"P66shc\",\n      \"GRB2\",\n      \"RAC1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}