| 2008 |
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. |
GST-fusion protein pulldown, heterologous co-expression in HEK cells, whole-cell patch-clamp, nNOS inhibitor pharmacology, expression in cardiac myocytes |
Proceedings of the National Academy of Sciences of the United States of America |
High |
18591664
|
| 2008 |
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. |
Whole-cell patch-clamp electrophysiology in HEK-293 cells and neonatal rat cardiomyocytes transiently transfected with wild-type or mutant SNTA1 |
Circulation. Arrhythmia and electrophysiology |
Medium |
19684871
|
| 2009 |
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. |
Heterologous co-expression in HEK293 cells with SCN5A, nNOS, and PMCA4b; whole-cell patch-clamp; nNOS inhibitor pharmacology |
Circulation. Arrhythmia and electrophysiology |
High |
20009079
|
| 2013 |
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. |
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 of molecular and cellular cardiology |
High |
23541953
|
| 2013 |
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. |
Heterologous co-expression in HEK293 cells with nNOS and PMCA4b; whole-cell patch-clamp; nNOS inhibitor pharmacology |
American journal of physiology. Heart and circulatory physiology |
Medium |
23376825
|
| 2011 |
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. |
Heterologous co-expression of SCN5A with SNTA1 variants in HEK293 cells; whole-cell patch-clamp |
Cardiogenetics |
Medium |
24319568
|
| 2014 |
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. |
Co-immunoprecipitation, siRNA/shRNA knockdown, Rac1 activation assay (GST-PAK pulldown), in vitro wound healing and migration assays, ROS generation assay |
British journal of cancer |
Medium |
24434436
|
| 2016 |
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. |
Actin-depolymerizing drug treatment, western blot for tyrosine phosphorylation, co-immunoprecipitation of SNTA1-Rac1, Rac1 activation assay, migration assay, ROS assay, apoptosis assay |
Apoptosis : an international journal on programmed cell death |
Medium |
27048259
|
| 2022 |
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. |
iPSC-CM generation from DMD patients, confocal microscopy of membrane protein localization, patch-clamp electrophysiology, non-viral piggyBac SNTA1 expression, optical mapping, contractility assays |
eLife |
High |
35762211
|
| 2022 |
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. |
CRISPR-Cas9 knockout in H9 ESCs, differentiation to cardiomyocytes, calcium imaging, contractility assay, ranolazine pharmacology |
Stem cell research & therapy |
Medium |
35773684
|
| 2025 |
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. |
CRISPR-Cas9 knockout in human ESCs, 2D cardiomyocyte differentiation, microelectrode array analysis, immunofluorescence for Nav1.5 localization |
Scientific reports |
Medium |
40835660
|
| 2022 |
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. |
Co-immunoprecipitation, immunofluorescence, RhoA activation assay, actin depolymerization, MTT proliferation assay, transwell migration assay, wound healing assay, Amplex red ROS assay |
Frontiers in oncology |
Medium |
35273919
|
| 2024 |
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. |
Western blot, immunoprecipitation, Rac1 activation assay, ROS assay, cell cycle analysis in IMR32 neuroblastoma cells treated with Aβ |
The European journal of neuroscience |
Medium |
39543939
|
| 2024 |
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. |
Snta1 KO mouse model, CSF tracer injection and fluorescence imaging, AQP4 immunofluorescence, amyloid-β ELISA/plaque quantification |
Neurobiology of disease |
Medium |
36990365
|
| 2018 |
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. |
Meta-analysis of five independent labs using Snta1 KO mice, CSF tracer injection and fluorescence imaging |
eLife |
High |
30561329
|
| 2024 |
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. |
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 |
Ecotoxicology and environmental safety |
Low |
39437515
|
| 2021 |
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. |
Jasplakinolide treatment, western blot for SNTA1 phosphorylation, transfection of WT and phospho-mutant SNTA1, Boyden chamber migration assay |
The protein journal |
Low |
33515365
|
| 2024 |
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. |
miR-206 transfection in C2C12 myoblasts/myotubes, western blot for SNTA1 protein, AChR clustering assay |
Journal of cell science |
Low |
39575567
|