{"gene":"CACNA1G","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":2006,"finding":"Genetic knockout of CaV3.1/alpha1G (cacna1g) abolishes T-type calcium current in sinoatrial node (SAN) and atrioventricular node cells, causing bradycardia, delayed AV conduction, prolonged SAN recovery time, and slowed pacemaker activity through reduction of diastolic depolarization slope, without affecting L-type Ca2+ current or right atrial excitability.","method":"Cacna1g knockout mice; telemetric ECG; intracardiac recordings; patch-clamp of isolated SAN/AV node cells","journal":"Circulation Research","confidence":"High","confidence_rationale":"Tier 2 — clean KO with multiple orthogonal electrophysiological and in vivo phenotypic readouts, replicated across cardiac cell types","pmids":["16690884"],"is_preprint":false},{"year":2005,"finding":"Thalamic CaV3.1 T-type Ca2+ channel activation causes prolonged inhibition (>9 s) of action-potential firing in thalamic projection neurons via intracellular Ca2+ increase (independent of synaptic transmission), and focal Cre/loxP deletion of Cacna1g from the rostral-midline thalamus fragments and reduces sleep by preventing blockade of arousal signal transmission through the thalamus.","method":"CaV3.1 knockout mice; Cre/loxP conditional deletion; patch-clamp with synaptic blockers; polysomnography","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including conditional KO with specific anatomical targeting and functional sleep recordings","pmids":["15677322"],"is_preprint":false},{"year":2009,"finding":"mGluR1 activation potentiates CaV3.1 T-type currents in cerebellar Purkinje cell dendritic spines via a G-protein- and tyrosine-phosphatase-dependent pathway; CaV3.1 channels co-localize with mGluR1 in dendritic spines and mediate fast subthreshold Ca2+ signaling potentiated during bursts of parallel fiber inputs.","method":"Whole-cell patch-clamp; ultrafast two-photon Ca2+ imaging; immunoelectron microscopy; CaV3.1 knockout animals","journal":"Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 1-2 — electrophysiology combined with ultrafast imaging and KO controls with orthogonal structural validation","pmids":["19657020"],"is_preprint":false},{"year":2015,"finding":"The recurrent p.Arg1715His mutation in the S4 voltage sensor of CaV3.1 causes autosomal dominant cerebellar ataxia (SCA42) by positively shifting the current-voltage and steady-state activation curves and increasing the slope factor of inactivation, resulting in decreased neuronal excitability in deep cerebellar nuclei neurons per computational modeling.","method":"Whole-cell patch-clamp in HEK293T cells expressing mutant vs. WT CaV3.1; computational neuronal modeling; exome sequencing with linkage analysis","journal":"American Journal of Human Genetics","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro electrophysiology with defined mutation, replicated independently in a second study (PMID 26715324)","pmids":["26456284","26715324"],"is_preprint":false},{"year":2018,"finding":"De novo gain-of-function mutations p.Ala961Thr and p.Met1531Val in CaV3.1 drastically impair channel inactivation (approximately 5× slower kinetics, >10 mV negative shift of half-inactivation), increase neuronal firing in cerebellar nuclear neuron models, and expand a window current, causing severe childhood-onset cerebellar atrophy; both effects are blocked by the selective T-type blocker TTA-P2.","method":"Patch-clamp electrophysiology in transfected cells; computational cerebellar neuron modeling; whole-exome sequencing","journal":"Brain","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro electrophysiology with multiple mutations, pharmacological rescue, and computational modeling","pmids":["29878067"],"is_preprint":false},{"year":2004,"finding":"The gamma6 subunit (long and short isoforms) specifically inhibits CaV3.1 current density by ~49-69% in HEK-293 cells and reduces endogenous LVA current in HL-1 atrial cells by 63%, without affecting voltage dependence, kinetics, or CaV3.1 mRNA/protein levels; gamma4 and gamma7 have no effect on CaV3.1.","method":"Co-expression in HEK-293 cells; whole-cell patch-clamp; Western blot; RT-PCR; GFP-tagged subunit localization","journal":"Journal of Molecular and Cellular Cardiology","confidence":"High","confidence_rationale":"Tier 2 — multiple cell types, multiple methods, isoform selectivity controls","pmids":["15572045"],"is_preprint":false},{"year":2008,"finding":"The gamma6 subunit first transmembrane domain (TM1) contains a critical GxxxA motif required for physical association with CaV3.1 (confirmed by co-immunoprecipitation in HEK cells and atrial myocytes) and for reducing channel availability; mutational analysis of the GxxxA motif abolishes inhibitory function, indicating helix-helix interactions underlie gamma6 modulation of CaV3.1.","method":"Chimeric constructs; site-directed mutagenesis; co-immunoprecipitation; single-channel patch-clamp; whole-cell patch-clamp","journal":"Journal of Physiology","confidence":"High","confidence_rationale":"Tier 1-2 — reconstitution with mutagenesis, co-IP in native tissue, and single-channel analysis","pmids":["18818244"],"is_preprint":false},{"year":2009,"finding":"An 8-amino acid peptide containing the GxxxA motif from gamma6 TM1 inhibits CaV3.1 current in a concentration-dependent, voltage-independent manner by dynamically binding/dissociating from the channel; both the GxxxA framework and surrounding aliphatic side-chains are required, consistent with interhelical interactions within the plasma membrane.","method":"Whole-cell electrophysiology; selective peptide mutagenesis","journal":"Molecular Pharmacology","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with systematic mutagenesis of the peptide","pmids":["19193827"],"is_preprint":false},{"year":2010,"finding":"The LEF1/beta-catenin transcriptional complex binds four LEF1 sites in the proximal Cacna1g promoter in thalamic neurons in vivo (chromatin immunoprecipitation), activates promoter-driven luciferase reporter activity, and increases T-type current in thalamic neurons treated with WNT3A or LiCl.","method":"Chromatin immunoprecipitation (ChIP); luciferase reporter assay; DNase I footprinting; patch-clamp of cultured thalamic neurons; WNT pathway activation","journal":"Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 2 — ChIP in vivo combined with reporter assays and functional electrophysiology","pmids":["20371816"],"is_preprint":false},{"year":2008,"finding":"Ni2+ blocks CaV3.1 pore by two mechanisms: a rapid, weakly voltage-dependent block (Kd ~1-3 mM, reduced by high permeant ion concentration) and a slow block (accelerated tail currents) that depends on permeant ion identity and concentration, with both components consistent with pore occlusion at distinct sites within the channel.","method":"Whole-cell patch-clamp; voltage-clamp; bimolecular kinetic analysis; ion substitution experiments","journal":"Journal of General Physiology","confidence":"High","confidence_rationale":"Tier 1 — systematic in vitro pharmacological characterization with rigorous biophysical analysis","pmids":["18663132"],"is_preprint":false},{"year":2008,"finding":"Ca2+ and Ba2+ permeate CaV3.1 with similar apparent Kd values (~3 mM Ca2+, ~2.5 mM Ba2+); block by micromolar divalent cations is time-dependent; divalent cations shift channel activation via surface charge screening (1 e- per 98 Å2); Ba2+ accelerates inactivation by occupying the pore.","method":"Whole-cell patch-clamp; instantaneous I-V analysis; Gouy-Chapman-Stern surface charge modeling","journal":"Journal of General Physiology","confidence":"High","confidence_rationale":"Tier 1 — systematic in vitro biophysical characterization over wide concentration ranges","pmids":["18663131"],"is_preprint":false},{"year":2003,"finding":"Extracellular protons shift CaV3.1 activation to more depolarized voltages and alter inactivation and deactivation kinetics; extracellular Ca2+ competes with protons for surface charges and for binding at the selectivity filter (EEDD pore locus mutation alters proton effects on selectivity); protons interact with intermediate closed states in the activation pathway.","method":"Whole-cell patch-clamp; pore-locus mutagenesis; model simulations; pH titration in HEK293 cells expressing CaV3.1","journal":"Journal of General Physiology","confidence":"High","confidence_rationale":"Tier 1 — in vitro electrophysiology with mutagenesis of selectivity filter","pmids":["12743167"],"is_preprint":false},{"year":2012,"finding":"Fe2+ blocks CaV3.1 in a voltage-dependent manner (Kd 2.5 mM at 0 mV) competing with Ca2+ at the pore, and permeates the channel carrying measurable inward currents (~20 ions/s per open channel at -60 mV with 1 µM Fe2+), establishing CaV3.1 as a candidate pathway for non-transferrin-mediated Fe2+ influx.","method":"Whole-cell patch-clamp; instantaneous I-V; Woodhull and Eyring two-site/three-barrier modeling; HEK293 cells stably expressing CaV3.1","journal":"Molecular Pharmacology","confidence":"High","confidence_rationale":"Tier 1 — quantitative in vitro permeation study with modeling","pmids":["22973060"],"is_preprint":false},{"year":2012,"finding":"Cd2+ blocks CaV3.1 in a voltage-dependent manner with relief at hyperpolarized potentials (suggesting pore permeation), carries sizable inward currents through the channel in the absence of other permeant ions, and radiolabeled 109Cd2+ uptake confirms cellular Cd2+ entry via CaV3.1.","method":"Whole-cell patch-clamp; instantaneous I-V; 109Cd2+ radiolabel uptake in HEK293 cells stably expressing CaV3.1","journal":"Molecular Pharmacology","confidence":"High","confidence_rationale":"Tier 1 — in vitro permeation with orthogonal radiolabel confirmation","pmids":["22973059"],"is_preprint":false},{"year":2006,"finding":"Human CACNA1G undergoes extensive alternative splicing at 11 sites within the ORF plus 2 alternative promoters and 2 polyadenylation sites, generating 30 distinct transcripts; patch-clamp of 9 variants reveals combinatorial interactions between variable domains alter gating parameters; splicing patterns shift from biased/independent in fetal brain to strongly concerted in adult brain.","method":"Full-length cDNA transcript scanning (1580 cDNAs); statistical splice-site linkage analysis; whole-cell patch-clamp of selected variants; 5'-RACE","journal":"Proteins","confidence":"High","confidence_rationale":"Tier 1-2 — large-scale transcript profiling combined with patch-clamp functional validation of multiple variants","pmids":["16671074"],"is_preprint":false},{"year":2012,"finding":"Beta-adrenergic stimulation (isoproterenol/cAMP analog) increases CaV3.1-mediated T-type Ca2+ current (ICa-T3.1) in cardiomyocytes via the cAMP/PKA pathway; this effect is blocked by H89 (PKA inhibitor) and is recapitulated in native SAN cells where CaV3.1 (not CaV3.2) mediates I(Ca-T).","method":"Patch-clamp of CaV3.1 transgenic cardiomyocytes and WT/KO SAN cells; pharmacological PKA inhibition; real-time PCR","journal":"PLoS ONE","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic models (TG, KO) combined with pharmacological pathway dissection","pmids":["22808078"],"is_preprint":false},{"year":2015,"finding":"Cyclin-dependent kinase 5 (Cdk5) upregulates CaV3.1 T-type Ca2+ current; overexpression of Cdk5 increases macroscopic currents in HEK-293 cells stably expressing CaV3.1 and in N1E-115 neuroblastoma cells, while Cdk5 siRNA reduces them; site-directed mutagenesis identifies serine 2234 in the CaV3.1 C-terminal region as the major phosphorylation site.","method":"Whole-cell patch-clamp; Cdk5 overexpression/siRNA knockdown; site-directed mutagenesis (S2234); HEK-293 stable cells and N1E-115 cells","journal":"PLoS ONE","confidence":"High","confidence_rationale":"Tier 1-2 — mutagenesis identifies specific phosphorylation site, combined with gain/loss-of-function electrophysiology","pmids":["25760945"],"is_preprint":false},{"year":2010,"finding":"CaV3.1 associates with the KV4.2-KChIP3-DPP10c complex and CaV3.1-mediated Ca2+ entry selectively right-shifts the inactivation voltage of KV4.2 into the physiological range; this regulation was not elicited by CaV1.4, CaV2.1, or CaV2.3, demonstrating T-type channel specificity.","method":"Heterologous co-expression; whole-cell patch-clamp; co-expression of channel complexes","journal":"Channels","confidence":"Medium","confidence_rationale":"Tier 3 — single co-expression study with channel specificity controls but no co-IP or structural validation","pmids":["20458163"],"is_preprint":false},{"year":2006,"finding":"CaV3.1 controls thrombin-induced von Willebrand factor (VWF) secretion from pulmonary microvascular endothelial cells (PMVECs) but not pulmonary artery endothelial cells (PAECs); T-type blocker mibefradil and CaV3.1 shRNA knockdown nearly abolish thrombin-stimulated VWF-GFP vesicle exocytosis; recombinant CaV3.1 expression in PAECs confers mibefradil-sensitive Ca2+ entry and VWF secretion.","method":"GFP-tagged VWF real-time imaging; shRNA knockdown; mibefradil pharmacology; recombinant CaV3.1 overexpression; Ca2+ imaging","journal":"American Journal of Physiology - Lung Cellular and Molecular Physiology","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function and gain-of-function with defined molecular mechanism linking channel to secretion","pmids":["17172292"],"is_preprint":false},{"year":2016,"finding":"CaV3.1 mediates a substantial inward Ca2+ current at resting membrane potentials in T helper cells; CaV3.1 knockout mice are resistant to experimental autoimmune encephalomyelitis with reduced GM-CSF production by Th1/Th17 cells and decreased NFAT nuclear translocation, without affecting TCR-initiated Ca2+ entry.","method":"Patch-clamp of T cells; CaV3.1 KO mice; EAE model; NFAT localization; cytokine secretion assays","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 — clean KO with multiple functional readouts including patch-clamp, signaling, and in vivo disease model","pmids":["27037192"],"is_preprint":false},{"year":2008,"finding":"CaV3.1 knockout mice show attenuated neuropathic pain after L5 spinal nerve ligation, with reduced spontaneous pain responses, increased mechanical pain threshold, and reduced thermal hyperalgesia, establishing CaV3.1 as a required contributor to neuropathic pain development.","method":"CaV3.1 (alpha1G-/-) knockout mice; behavioral pain assays (spinal nerve ligation model); mechanical and thermal thresholds","journal":"Molecules and Cells","confidence":"High","confidence_rationale":"Tier 2 — clean KO with multiple behavioral pain endpoints","pmids":["18414012"],"is_preprint":false},{"year":2016,"finding":"Decreased Cacna1g expression partially ameliorates Scn1a+/- Dravet syndrome phenotype (improved survival, reduced spontaneous seizure frequency) while increased Cacna1g expression worsens Scn2aQ54 epilepsy (elevated seizure frequency), establishing Cacna1g as a genetic modifier that operates in epistasis with sodium channel genes.","method":"Transgenic alteration of Cacna1g expression in Scn1a+/- and Scn2aQ54 mouse models; seizure monitoring; survival analysis","journal":"Epilepsia","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis in two independent epilepsy mouse models with bidirectional modifier effects","pmids":["28556246","27112236"],"is_preprint":false},{"year":2010,"finding":"CaV3.1 T-type Ca2+ channel is the dominant voltage-gated Ca2+ channel in mouse preadipocytes (C2C12 and primary); siRNA knockdown of alpha1G abolishes low-threshold Ca2+ current; mibefradil and NNC55-0396 block preadipocyte proliferation and prevent cell cycle entry/progression, while CaV3.1 expression decreases upon adipocyte differentiation.","method":"Patch-clamp; RT-PCR; Western blot; siRNA knockdown; immunohistochemistry; cell proliferation and cell cycle assays","journal":"American Journal of Physiology - Cell Physiology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods with siRNA confirming channel identity and pharmacological cell cycle phenotype","pmids":["20457833"],"is_preprint":false},{"year":2010,"finding":"CaV3.1 T-type Ca2+ channel expression is upregulated in pulmonary artery smooth muscle cells by IGF-I through PI3K/Akt signaling; CaV3.1 knockdown (RNAi) prevents IGF-I-induced cyclin D expression/activation and cell cycle progression, linking T-type Ca2+ entry to mitogenic signaling.","method":"RT-PCR; Western blot; RNAi knockdown; patch-clamp; PI3K/Akt pathway inhibitors; cell cycle analysis","journal":"American Journal of Physiology - Cell Physiology","confidence":"High","confidence_rationale":"Tier 2 — RNAi with defined pathway placement (PI3K/Akt → CaV3.1 → cyclin D)","pmids":["21148410"],"is_preprint":false},{"year":2006,"finding":"Domain IV is the primary determinant of CaV3.1 vs. CaV3.3 differences in activation time constant and recovery from inactivation; domains I and IV together determine half-activation potential; the carboxy-terminal region is not involved; multiple domains collectively control inactivation kinetics.","method":"Chimeric channel constructs swapping transmembrane domains I-IV; whole-cell patch-clamp in tsA-201 cells","journal":"Neuroscience","confidence":"High","confidence_rationale":"Tier 1 — systematic chimeric mutagenesis with electrophysiological characterization","pmids":["16996222"],"is_preprint":false},{"year":2008,"finding":"BMP4 upregulates CaV3.1 mRNA and T-type Ca2+ current in HL-1 atrial myocytes through a ROS/MAPK (JNK and p38) pathway involving NADPH oxidase-4 (NOX4); inhibitors of NADPH oxidase, radical scavengers, and JNK/p38 inhibitors block BMP4-induced CaV3.1 upregulation.","method":"Patch-clamp; real-time PCR; MAPK/NOX4 pathway inhibitors; noggin BMP4 inhibitor; HL-1 cells","journal":"Pflugers Archiv","confidence":"Medium","confidence_rationale":"Tier 3 — pharmacological pathway dissection without direct phosphorylation site identification","pmids":["24510064"],"is_preprint":false},{"year":2012,"finding":"Overexpression of full-length CaV3.1 suppresses MCF-7 breast cancer cell proliferation and increases apoptosis (Annexin V/TUNEL positive cells localize CaV3.1 to plasma membrane); CaV3.1 knockdown promotes proliferation and blocks cyclophosphamide-induced apoptosis; CaV3.2 manipulation has no effect on proliferation.","method":"CaV3.1 overexpression and siRNA knockdown; apoptosis assays (Annexin V, TUNEL); immunocytochemistry; cell proliferation assays; ProTx-I pharmacology","journal":"International Journal of Oncology","confidence":"Medium","confidence_rationale":"Tier 2-3 — gain and loss of function with apoptosis phenotype, but mechanistic pathway not fully defined","pmids":["22469755"],"is_preprint":false},{"year":2011,"finding":"Roscovitine blocks CaV3.1 channels preferentially at depolarized voltages (EC50 10 µM) by negatively shifting closed-state inactivation voltage dependence, accelerating closed-state inactivation, and slowing recovery from inactivation, without major effects on open-state inactivation or deactivation.","method":"Transient expression in HEK293 cells; whole-cell patch-clamp; voltage protocols dissecting inactivation states","journal":"Journal of Pharmacology and Experimental Therapeutics","confidence":"High","confidence_rationale":"Tier 1 — in vitro electrophysiology with defined mechanistic dissection of inactivation states","pmids":["22088954"],"is_preprint":false},{"year":2008,"finding":"CaV3.1 is expressed in the plasma membrane of outer hair cells (OHCs) in adult rat cochlea (but not inner hair cells at protein level); patch-clamp reveals a transient low-threshold inward Ca2+ current from -100 mV holding potential that is blocked by 1 µM mibefradil, establishing functional CaV3.1 T-type channel activity in mature OHCs.","method":"In situ hybridization; immunohistochemistry; Western blot; patch-clamp with mibefradil pharmacology","journal":"Brain Research","confidence":"Medium","confidence_rationale":"Tier 2-3 — morphological plus electrophysiological evidence but limited functional consequence established","pmids":["18294617"],"is_preprint":false},{"year":2021,"finding":"CaV3.1 is predominantly localized in neuronal progenitor cells of the mouse hippocampal dentate gyrus; CaV3.1 knockout mice show decreased proliferation and survival of newly generated cells, impaired neuronal differentiation, reduced CaMKII and Akt phosphorylation, decreased BDNF expression, and impaired social interaction.","method":"CaV3.1 KO mice; BrdU cell labeling; doublecortin immunostaining; immunohistochemistry; Western blot; gene ontology analysis","journal":"Acta Physiologica","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with multiple cellular readouts and downstream signaling analysis, though pathway placement is correlative","pmids":["33393208"],"is_preprint":false},{"year":2022,"finding":"CaV3.1 expression in dmVMH neurons mediates burst firing; optogenetically evoked burst firing induces anxiety-like behavior and shifts energy metabolism toward fat oxidation; Cav3.1 knockdown in dmVMH has opposite effects; fluoxetine blocks chronic stress-induced Cav3.1 upregulation and burst firing.","method":"Optogenetics; Cav3.1 knockdown; respiratory exchange ratio measurement; behavioral assays; in vivo electrophysiology","journal":"Molecular Psychiatry","confidence":"High","confidence_rationale":"Tier 2 — bidirectional manipulation with defined circuit-level and behavioral outcomes","pmids":["35318460"],"is_preprint":false},{"year":2024,"finding":"In human thalamocortical assembloids, the M1531V gain-of-function CACNA1G variant increases T-type currents in thalamic neurons and causes correlated hyperactivity of thalamic and cortical neurons; CACNA1G loss-of-function results in abnormal thalamocortical connectivity through increased spontaneous thalamic activity and aberrant axonal projections.","method":"Human iPSC-derived thalamocortical assembloids; patch-clamp; calcium imaging; axonal projection analysis; CACNA1G KO and GOF variant engineering","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 — human system with multiple orthogonal readouts at cellular and circuit level","pmids":["39419023"],"is_preprint":false},{"year":2012,"finding":"Insulin upregulates CaV3.1 T-type Ca2+ current in GH3 pituitary cells through increased endosomal recycling and membrane incorporation of channels, not via transcriptional upregulation; disruption of endosomal recycling by Brefeldin A or dominant-negative Rab11a prevents insulin's stimulatory effects.","method":"Patch-clamp; real-time RT-PCR; Western blot; luciferase reporter; Brefeldin A treatment; dominant-negative Rab11a expression in HEK-293/Cav3.1 cells","journal":"Cell Calcium","confidence":"Medium","confidence_rationale":"Tier 2 — orthogonal approaches distinguishing transcriptional vs. trafficking mechanism, but single lab","pmids":["22770883"],"is_preprint":false},{"year":2022,"finding":"CaV3.1 (but not CaV3.2) is required for stimulated ERK1/2 phosphorylation in response to serum, PDGF, and TGF-β1 in mouse mesangial cells; CRISPR-Cas9 knockout of CaV3.1 abolishes stimulated phospho-ERK1/2, whereas CaV3.2 KO retains these responses.","method":"CRISPR-Cas9 single/double KO of CaV3.1 and CaV3.2; ERK1/2 phosphorylation assays; proliferation assays; pharmacological TTCC inhibitors","journal":"BMC Nephrology","confidence":"Medium","confidence_rationale":"Tier 2 — CRISPR KO with isoform-specific controls, but mechanistic link between Ca2+ entry and ERK not directly established","pmids":["35710406"],"is_preprint":false},{"year":2018,"finding":"CAV3.1 knockdown in prostate cancer cells inhibits proliferation, migration, and invasion by suppressing AKT activity, leading to decreased CCND1, N-cadherin, and Vimentin and increased E-cadherin; ectopic AKT expression rescues these effects.","method":"CAV3.1 siRNA knockdown; ectopic AKT expression rescue; CCK-8; cell cycle; transwell invasion; Western blot in prostate cancer cells","journal":"Cancer Management and Research","confidence":"Medium","confidence_rationale":"Tier 2-3 — loss-of-function with rescue experiment defining AKT pathway, single lab","pmids":["30410396"],"is_preprint":false},{"year":2003,"finding":"The CACNA1G gene has two functional promoters (A and B) generating transcripts with different 5'-UTRs; promoter A is favored in undifferentiated Y79 cells and promoter B in differentiated cells; promoter A activity decreases during differentiation (with upstream enhancer/repressor sequences identified), explaining down-regulation of CaV3.1 expression during neuronal differentiation.","method":"RT-PCR; 5'-RACE; promoter-luciferase reporter assays; cloning of genomic DNA","journal":"European Journal of Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — reporter assays with defined promoter elements, single lab","pmids":["12752779"],"is_preprint":false},{"year":2008,"finding":"Dexamethasone (glucocorticoid) increases CaV3.1 mRNA and T-type Ca2+ current in neonatal cardiac myocytes through glucocorticoid receptor (GR) and NFκB; functional glucocorticoid response elements (GREs) are identified in the Cacna1g promoter, with GRE-1 mediating aldosterone response and GRE-4/GRE-5 mediating dexamethasone response.","method":"Patch-clamp; RT-PCR; promoter-luciferase reporter; site-directed mutagenesis of GREs; GR antagonist RU38486; NFκB inhibitor PDTC","journal":"Molecular and Cellular Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — mutagenesis of promoter elements combined with pharmacological dissection, single lab","pmids":["18820838","19705257"],"is_preprint":false},{"year":2025,"finding":"Leucine directly binds a hydrophobic pocket of the CaV3.1 voltage-sensing segment and lowers the threshold for voltage-dependent activation; pharmacological inhibition of CaV3.1 blunts leucine-induced POMC neuron activation; genetic deletion of Cacna1g in POMC neurons abolishes appetite- and weight-suppressive effects of high-protein feeding.","method":"Pharmacological inhibition in cultured neurons and brain slices; conditional Cacna1g KO in POMC neurons; in vivo hypothalamic leucine injection; diet-induced obesity model; structural binding analysis","journal":"Cell Metabolism","confidence":"High","confidence_rationale":"Tier 1-2 — direct leucine-channel binding with multiple orthogonal methods including conditional KO, pharmacology, and brain slice electrophysiology","pmids":["42025169"],"is_preprint":false},{"year":2025,"finding":"CACNA1G loss-of-function in Xenopus tropicalis reduces cilia quantity in the left-right organizer (LRO), causing disrupted LR patterning markers (pitx2c and dand5) and cardiac looping defects, establishing a role for CaV3.1 in ciliogenesis and LR asymmetry.","method":"CRISPR crispants in Xenopus tropicalis; in situ hybridization of LR markers; morphological analysis of LRO cilia; cardiac looping assessment","journal":"Genesis","confidence":"Medium","confidence_rationale":"Tier 2 — CRISPR loss-of-function with multiple readouts, but mechanism linking channel to ciliogenesis not established","pmids":["40008628"],"is_preprint":false},{"year":2011,"finding":"CaV3.1 knockout in the alpha1 GABAA receptor null background (double mutant mice) causes severe motor abnormalities, potentiated tremor at 20 Hz refractory to propranolol, and age-dependent loss of cerebellar Purkinje neurons, revealing a role for CaV3.1 in motor coordination under pathological conditions.","method":"Double knockout mice (alpha1-/- / alpha1G-/-); tremor activity measurement; rotarod motor learning; propranolol pharmacology; cerebellar histology","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis experiment with defined cellular (Purkinje cell loss) and behavioral readouts, single lab","pmids":["21621520"],"is_preprint":false}],"current_model":"CACNA1G encodes CaV3.1, the pore-forming subunit of a low-voltage-activated T-type calcium channel that is gated by membrane depolarization near resting potential, selectively permeates Ca2+ (and divalent metal ions including Fe2+ and Cd2+) through an EEDD selectivity filter, is modulated post-translationally by Cdk5-mediated phosphorylation at Ser2234, inhibited by the gamma6 subunit via a GxxxA TM1 motif, upregulated by beta-adrenergic/PKA, BMP4/ROS/MAPK, glucocorticoid/GR/NFκB, and Wnt/LEF1/beta-catenin pathways, directly bound and activated by leucine at the voltage-sensing segment to regulate hypothalamic POMC neuron satiety signaling, and plays defined roles in cardiac pacemaking, thalamic sleep stabilization, cerebellar Purkinje cell function, neuropathic pain, T cell cytokine production, and adult hippocampal neurogenesis; gain-of-function mutations impair channel inactivation and cause autosomal dominant cerebellar ataxia or neurodevelopmental encephalopathies, while loss of function reduces channel availability and acts as a genetic modifier of sodium channelopathy-associated epilepsy."},"narrative":{"teleology":[{"year":2003,"claim":"Defining how extracellular protons and Ca²⁺ interact at the CaV3.1 selectivity filter (EEDD locus) established the biophysical basis of pore selectivity and gating modulation by pH.","evidence":"Pore-locus mutagenesis with pH titration and patch-clamp in HEK293 cells expressing CaV3.1","pmids":["12743167"],"confidence":"High","gaps":["No structural resolution of proton binding sites","In vivo relevance of pH modulation not tested"]},{"year":2003,"claim":"Identification of two functional promoters (A and B) with differentiation-dependent switching explained how CaV3.1 transcription is regulated during neuronal maturation.","evidence":"5'-RACE, promoter-luciferase reporters in Y79 retinoblastoma cells","pmids":["12752779"],"confidence":"Medium","gaps":["Promoter switching not validated in primary neurons in vivo","Trans-acting factors not identified"]},{"year":2004,"claim":"Demonstrating that the γ6 subunit specifically inhibits CaV3.1 current density without altering gating or expression levels revealed a dedicated auxiliary subunit mechanism for T-type channel regulation.","evidence":"Co-expression in HEK-293 and HL-1 atrial cells with patch-clamp and protein quantification","pmids":["15572045"],"confidence":"High","gaps":["Mechanism of current reduction (trafficking vs. gating) not resolved at this stage","In vivo significance not tested"]},{"year":2005,"claim":"Conditional deletion of Cacna1g from rostral-midline thalamus established that CaV3.1-dependent prolonged firing inhibition is the mechanism by which the thalamus gates arousal signals to stabilize sleep.","evidence":"Cre/loxP conditional KO; patch-clamp with synaptic blockers; polysomnography in mice","pmids":["15677322"],"confidence":"High","gaps":["Downstream Ca²⁺-dependent effectors mediating 9-second firing inhibition not identified","Circuit-level mechanism of arousal signal blockade not mapped"]},{"year":2006,"claim":"Global Cacna1g knockout abolishing T-type current in SAN/AV node cells and causing bradycardia definitively established CaV3.1 as the molecular basis of T-type current-driven cardiac pacemaking.","evidence":"Cacna1g KO mice; telemetric ECG; patch-clamp of isolated SAN/AV node cells","pmids":["16690884"],"confidence":"High","gaps":["Relative contribution of CaV3.1 vs. HCN channels to pacemaker depolarization under physiological conditions not quantified","Compensatory mechanisms in KO not excluded"]},{"year":2006,"claim":"Comprehensive transcript profiling revealing 30 splice variants with combinatorial gating effects and developmentally regulated splicing patterns established that alternative splicing is a major mechanism for CaV3.1 functional diversification.","evidence":"Scanning of 1580 full-length cDNAs; patch-clamp of 9 selected variants; 5'-RACE","pmids":["16671074"],"confidence":"High","gaps":["Functional significance of most variant combinations untested","Cell-type-specific splice variant expression not mapped"]},{"year":2006,"claim":"Chimeric domain-swapping between CaV3.1 and CaV3.3 identified domain IV as the primary determinant of activation kinetics and recovery from inactivation, localizing key gating differences to specific structural modules.","evidence":"Chimeric channel constructs with whole-cell patch-clamp in tsA-201 cells","pmids":["16996222"],"confidence":"High","gaps":["Specific residues within domain IV responsible not identified","No structural model available"]},{"year":2006,"claim":"Showing that CaV3.1 controls thrombin-induced VWF secretion from pulmonary microvascular endothelial cells extended the channel's functional repertoire beyond excitable cells to regulated exocytosis in endothelium.","evidence":"shRNA knockdown and recombinant CaV3.1 overexpression; GFP-VWF real-time imaging; Ca²⁺ imaging","pmids":["17172292"],"confidence":"High","gaps":["Ca²⁺ microdomain coupling between CaV3.1 and secretory machinery not characterized","Relevance to hemostasis in vivo not tested"]},{"year":2008,"claim":"Mutational analysis of the γ6 GxxxA transmembrane motif, combined with co-IP in native atrial myocytes, established that helix-helix interactions within the membrane underlie γ6-mediated CaV3.1 inhibition, and a synthetic GxxxA peptide could recapitulate this inhibition.","evidence":"Site-directed mutagenesis; co-IP in HEK cells and atrial myocytes; single-channel and whole-cell patch-clamp; peptide electrophysiology","pmids":["18818244","19193827"],"confidence":"High","gaps":["Binding interface on CaV3.1 not mapped","Stoichiometry of γ6-CaV3.1 complex unknown"]},{"year":2008,"claim":"Systematic permeation studies with Ni²⁺, Ca²⁺, Ba²⁺, and surface charge analysis defined the biophysical principles of CaV3.1 ion selectivity and pore block, establishing a quantitative framework for divalent cation interactions at two distinct pore sites.","evidence":"Whole-cell patch-clamp with ion substitution, Woodhull modeling, and Gouy-Chapman-Stern analysis in HEK293 cells","pmids":["18663132","18663131"],"confidence":"High","gaps":["No atomic-resolution pore structure available","Physiological relevance of surface charge effects in native membranes not tested"]},{"year":2008,"claim":"Attenuated neuropathic pain in CaV3.1 KO mice after spinal nerve ligation identified the channel as a required contributor to neuropathic pain processing.","evidence":"CaV3.1 KO mice; behavioral pain assays with mechanical and thermal thresholds","pmids":["18414012"],"confidence":"High","gaps":["Spinal vs. supraspinal site of action not determined","Downstream signaling from CaV3.1 Ca²⁺ entry to pain sensitization unknown"]},{"year":2008,"claim":"Identification of functional glucocorticoid response elements in the Cacna1g promoter established a transcriptional mechanism for corticosteroid-mediated upregulation of T-type current in cardiomyocytes.","evidence":"Promoter-luciferase with GRE mutagenesis; GR antagonist; NFκB inhibitor; patch-clamp in neonatal cardiomyocytes","pmids":["18820838","19705257"],"confidence":"Medium","gaps":["Direct GR occupancy at endogenous Cacna1g GREs not shown by ChIP","Physiological significance of glucocorticoid regulation in adult heart not tested"]},{"year":2009,"claim":"Demonstrating mGluR1-dependent potentiation of CaV3.1 in cerebellar Purkinje cell dendritic spines established a T-type channel-mediated fast Ca²⁺ signaling mechanism for synaptic integration of parallel fiber inputs.","evidence":"Whole-cell patch-clamp; ultrafast two-photon Ca²⁺ imaging; immunoelectron microscopy; CaV3.1 KO animals","pmids":["19657020"],"confidence":"High","gaps":["Downstream Ca²⁺ effectors in dendritic spines not identified","Behavioral consequence of impaired spine Ca²⁺ signaling not tested"]},{"year":2010,"claim":"ChIP demonstrating LEF1/β-catenin binding to the Cacna1g promoter in thalamic neurons in vivo, combined with WNT3A-induced T-type current increases, established Wnt signaling as a transcriptional activator of CaV3.1 in the brain.","evidence":"Chromatin immunoprecipitation; luciferase reporter; DNase I footprinting; patch-clamp of cultured thalamic neurons","pmids":["20371816"],"confidence":"High","gaps":["Whether Wnt-driven CaV3.1 upregulation contributes to thalamic oscillations in vivo not tested","Other Wnt target genes acting in parallel not controlled for"]},{"year":2010,"claim":"Identification of CaV3.1 as the dominant voltage-gated Ca²⁺ channel in preadipocytes required for cell cycle entry, and its upregulation by IGF-I/PI3K/Akt in pulmonary artery smooth muscle cells linking it to cyclin D expression, established CaV3.1 as a proliferative signal in non-neuronal mitogenic pathways.","evidence":"siRNA/RNAi knockdown; patch-clamp; cell cycle analysis; PI3K/Akt inhibitors in C2C12, primary preadipocytes, and PASMC","pmids":["20457833","21148410"],"confidence":"High","gaps":["Direct Ca²⁺-dependent mechanism linking channel opening to cyclin D induction not identified","In vivo significance for adipogenesis or vascular remodeling not tested"]},{"year":2012,"claim":"Quantitative permeation studies showing Fe²⁺ and Cd²⁺ transit through the CaV3.1 pore (with radiolabel confirmation for Cd²⁺) established T-type channels as candidate pathways for toxic and essential divalent metal ion entry into cells.","evidence":"Patch-clamp with Eyring barrier modeling; ¹⁰⁹Cd²⁺ radiolabel uptake in HEK293-CaV3.1 stable cells","pmids":["22973060","22973059"],"confidence":"High","gaps":["Physiological relevance of Fe²⁺/Cd²⁺ permeation in native tissues not demonstrated","Relative contribution vs. dedicated metal transporters unknown"]},{"year":2012,"claim":"β-adrenergic/PKA-dependent enhancement of CaV3.1 current in SAN cells identified a neurohumoral mechanism for autonomic modulation of T-type channel activity in cardiac pacemaking.","evidence":"Patch-clamp of CaV3.1 transgenic cardiomyocytes and WT/KO SAN cells; PKA inhibitor H89","pmids":["22808078"],"confidence":"High","gaps":["PKA phosphorylation site on CaV3.1 not identified","Contribution to heart rate increase in vivo not quantified"]},{"year":2012,"claim":"Insulin-stimulated CaV3.1 membrane insertion via Rab11a-dependent endosomal recycling revealed a post-translational trafficking mechanism for acute regulation of T-type current independent of transcription.","evidence":"Patch-clamp; Brefeldin A treatment; dominant-negative Rab11a in HEK-293/CaV3.1 and GH3 pituitary cells","pmids":["22770883"],"confidence":"Medium","gaps":["Direct visualization of CaV3.1 endosomal trafficking not performed","Insulin signaling intermediates connecting to Rab11a not identified"]},{"year":2015,"claim":"Identification of CaV3.1 Ser2234 as the Cdk5 phosphorylation site that increases T-type current defined a specific kinase-substrate relationship for post-translational channel modulation in neurons.","evidence":"Site-directed mutagenesis; Cdk5 overexpression/siRNA; patch-clamp in HEK-293 and N1E-115 cells","pmids":["25760945"],"confidence":"High","gaps":["In vivo phosphorylation at Ser2234 not confirmed","Downstream physiological consequence of Cdk5-CaV3.1 regulation not established"]},{"year":2015,"claim":"The p.Arg1715His mutation in the CaV3.1 S4 voltage sensor shifting activation and inactivation established the first causal link between CACNA1G gain-of-function and autosomal dominant spinocerebellar ataxia (SCA42).","evidence":"Whole-cell patch-clamp of mutant vs. WT in HEK293T; computational modeling; exome sequencing with linkage in families","pmids":["26456284","26715324"],"confidence":"High","gaps":["Patient-derived neuronal validation not performed at this stage","Mechanism of selective cerebellar vulnerability not explained"]},{"year":2016,"claim":"CaV3.1 KO mice resisting EAE with reduced T-helper GM-CSF production and impaired NFAT nuclear translocation established an unexpected role for T-type channels in adaptive immune cell activation.","evidence":"CaV3.1 KO mice; EAE model; patch-clamp of T cells; NFAT localization; cytokine assays","pmids":["27037192"],"confidence":"High","gaps":["How resting-potential T-type Ca²⁺ entry triggers NFAT without store depletion is mechanistically unclear","Contribution relative to CRAC/Orai channels not quantified"]},{"year":2016,"claim":"Bidirectional modification of seizure severity in two sodium channelopathy epilepsy models by Cacna1g dosage established the gene as a genetic modifier operating in epistasis with SCN1A and SCN2A.","evidence":"Transgenic Cacna1g alteration in Scn1a⁺/⁻ and Scn2aQ54 mouse models; seizure and survival monitoring","pmids":["28556246","27112236"],"confidence":"High","gaps":["Mechanism of T-type/Na⁺ channel epistasis at the circuit level not resolved","Human genetic modifier studies not performed"]},{"year":2018,"claim":"De novo mutations p.Ala961Thr and p.Met1531Val causing dramatic inactivation impairment and childhood cerebellar atrophy, rescuable by TTA-P2, expanded the genotype-phenotype spectrum and demonstrated pharmacological tractability of CaV3.1 channelopathies.","evidence":"Patch-clamp of transfected cells; TTA-P2 pharmacology; computational cerebellar neuron modeling; whole-exome sequencing","pmids":["29878067"],"confidence":"High","gaps":["In vivo TTA-P2 rescue not attempted","Mechanism of selective cerebellar neuron vulnerability still unexplained"]},{"year":2021,"claim":"CaV3.1 localization to hippocampal neural progenitors and KO-associated deficits in proliferation, differentiation, and BDNF/CaMKII/Akt signaling established the channel as a regulator of adult hippocampal neurogenesis.","evidence":"CaV3.1 KO mice; BrdU labeling; doublecortin immunostaining; Western blot for signaling pathways","pmids":["33393208"],"confidence":"Medium","gaps":["Causal link between CaV3.1 Ca²⁺ entry and specific downstream kinase activation is correlative","Cell-autonomous vs. non-cell-autonomous effects not distinguished"]},{"year":2022,"claim":"CaV3.1-driven burst firing in dorsomedial VMH neurons inducing anxiety-like behavior and shifting energy metabolism toward fat oxidation established a defined hypothalamic circuit role for CaV3.1 in stress and metabolism.","evidence":"Optogenetics; Cav3.1 knockdown; respiratory exchange ratio; behavioral assays; in vivo electrophysiology","pmids":["35318460"],"confidence":"High","gaps":["Downstream neuropeptide or neurotransmitter mediators not identified","Human relevance not established"]},{"year":2024,"claim":"Human thalamocortical assembloids carrying the M1531V GOF variant or CACNA1G KO demonstrated that both gain and loss of CaV3.1 function disrupt thalamocortical connectivity, validating channel-dependent circuit assembly in a human model system.","evidence":"iPSC-derived thalamocortical assembloids; patch-clamp; calcium imaging; axonal projection analysis","pmids":["39419023"],"confidence":"High","gaps":["Whether connectivity defects are reversible with T-type blockers not tested","Correlation with patient phenotypes not directly established"]},{"year":2025,"claim":"Discovery that leucine directly binds the CaV3.1 voltage-sensing segment to lower activation threshold, activating hypothalamic POMC neurons and suppressing appetite, revealed the channel as a molecular sensor coupling amino acid availability to satiety signaling.","evidence":"Conditional Cacna1g KO in POMC neurons; hypothalamic leucine injection; structural binding analysis; brain slice electrophysiology; diet-induced obesity model","pmids":["42025169"],"confidence":"High","gaps":["Atomic structure of leucine-binding pocket not fully resolved","Whether other amino acids share this binding mode unknown"]},{"year":2025,"claim":"CACNA1G loss-of-function in Xenopus reducing LRO cilia and disrupting left-right patterning revealed an unexpected developmental role for CaV3.1 in ciliogenesis.","evidence":"CRISPR crispants in Xenopus tropicalis; in situ hybridization; LRO cilia morphological analysis","pmids":["40008628"],"confidence":"Medium","gaps":["Mechanism linking CaV3.1 Ca²⁺ entry to ciliogenesis completely unknown","Not confirmed in mammalian systems","Channel-independent effects of CRISPR not excluded"]},{"year":null,"claim":"Key unresolved questions include the atomic structure of the CaV3.1 channel, the mechanism by which low-voltage Ca²⁺ entry selectively activates NFAT in T cells, the basis of cerebellar vulnerability in CACNA1G channelopathies, and whether T-type channel blockers can be developed as therapeutics for SCA42 or neurodevelopmental encephalopathies.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution cryo-EM structure of CaV3.1 reported","Therapeutic window for T-type blockers in channelopathies not established","Cell-type-specific splice variant functions largely unmapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,1,2,9,10,11,12,13]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[37]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,5,6,18,19,28]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[1,2,30,31]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8,15,23,36,37]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[19]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[0,10,12,13]}],"complexes":[],"partners":["CACNG6","GRM1","LEF1","CDK5","RAB11A"],"other_free_text":[]},"mechanistic_narrative":"CACNA1G encodes CaV3.1, the pore-forming α1 subunit of a low-voltage-activated (T-type) calcium channel that opens near resting membrane potential to conduct transient inward Ca²⁺ currents critical for rhythmic burst firing, pacemaker depolarization, and subthreshold calcium signaling across diverse excitable and non-excitable cell types. CaV3.1-mediated Ca²⁺ entry drives diastolic depolarization in sinoatrial and atrioventricular node cells for cardiac pacemaking [PMID:16690884], sustains thalamic action-potential silencing required for sleep maintenance [PMID:15677322], supports mGluR1-potentiated dendritic spine Ca²⁺ transients in cerebellar Purkinje cells [PMID:19657020], enables NFAT-dependent GM-CSF production in T helper cells [PMID:27037192], mediates leucine-sensing activation of hypothalamic POMC neurons to suppress appetite [PMID:42025169], and promotes adult hippocampal neurogenesis via CaMKII/Akt/BDNF signaling [PMID:33393208]. Channel activity is tuned by extensive alternative splicing that combinatorially adjusts gating [PMID:16671074], post-translational regulation including Cdk5 phosphorylation at Ser2234 [PMID:25760945] and β-adrenergic/PKA-dependent enhancement [PMID:22808078], inhibition by the γ6 subunit through a GxxxA transmembrane motif [PMID:18818244], and transcriptional control by Wnt/LEF1/β-catenin [PMID:20371816] and glucocorticoid/GR/NFκB pathways [PMID:18820838]. Gain-of-function missense mutations that impair channel inactivation cause autosomal dominant spinocerebellar ataxia (SCA42) and childhood-onset cerebellar atrophy [PMID:26456284, PMID:29878067], while altered Cacna1g dosage modifies seizure severity in sodium channelopathy models of epilepsy [PMID:27112236]."},"prefetch_data":{"uniprot":{"accession":"O43497","full_name":"Voltage-dependent T-type calcium channel subunit alpha-1G","aliases":["Cav3.1c","NBR13","Voltage-gated calcium channel subunit alpha Cav3.1"],"length_aa":2377,"mass_kda":262.5,"function":"Voltage-sensitive calcium channels (VSCC) mediate the entry of calcium ions into excitable cells and are also involved in a variety of calcium-dependent processes, including muscle contraction, hormone or neurotransmitter release, gene expression, cell motility, cell division and cell death. The isoform alpha-1G gives rise to T-type calcium currents. T-type calcium channels belong to the 'low-voltage activated (LVA)' group and are strongly blocked by mibefradil. A particularity of this type of channel is an opening at quite negative potentials and a voltage-dependent inactivation. T-type channels serve pacemaking functions in both central neurons and cardiac nodal cells and support calcium signaling in secretory cells and vascular smooth muscle. They may also be involved in the modulation of firing patterns of neurons which is important for information processing as well as in cell growth processes Voltage-sensitive calcium channels (VSCC) mediate the entry of calcium ions into excitable cells and are also involved in a variety of calcium-dependent processes, including muscle contraction, hormone or neurotransmitter release, gene expression, cell motility, cell division and cell death. The isoform alpha-1G gives rise to T-type calcium currents","subcellular_location":"Cell membrane; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/O43497/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CACNA1G","classification":"Not Classified","n_dependent_lines":50,"n_total_lines":1208,"dependency_fraction":0.041390728476821195},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CACNA1G","total_profiled":1310},"omim":[{"mim_id":"620144","title":"CACHE DOMAIN-CONTAINING PROTEIN 1; CACHD1","url":"https://www.omim.org/entry/620144"},{"mim_id":"619863","title":"JUNCTOPHILIN 4; JPH4","url":"https://www.omim.org/entry/619863"},{"mim_id":"618087","title":"SPINOCEREBELLAR ATAXIA 42, EARLY-ONSET, SEVERE, WITH NEURODEVELOPMENTAL DEFICITS; SCA42ND","url":"https://www.omim.org/entry/618087"},{"mim_id":"616795","title":"SPINOCEREBELLAR ATAXIA 42; SCA42","url":"https://www.omim.org/entry/616795"},{"mim_id":"613514","title":"ZONA PELLUCIDA GLYCOPROTEIN 4; ZP4","url":"https://www.omim.org/entry/613514"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Acrosome","reliability":"Approved"},{"location":"Equatorial segment","reliability":"Approved"},{"location":"Perinuclear theca","reliability":"Approved"},{"location":"Nuclear bodies","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":19.3},{"tissue":"cervix","ntpm":8.2},{"tissue":"retina","ntpm":8.0}],"url":"https://www.proteinatlas.org/search/CACNA1G"},"hgnc":{"alias_symbol":["Cav3.1","NBR13"],"prev_symbol":[]},"alphafold":{"accession":"O43497","domains":[{"cath_id":"1.20.120.350","chopping":"60-194","consensus_level":"high","plddt":84.4601,"start":60,"end":194},{"cath_id":"1.20.120.350","chopping":"743-848","consensus_level":"high","plddt":82.2658,"start":743,"end":848},{"cath_id":"1.10.287.70","chopping":"851-982","consensus_level":"medium","plddt":78.5605,"start":851,"end":982},{"cath_id":"1.20.120.350","chopping":"1276-1392","consensus_level":"medium","plddt":83.3891,"start":1276,"end":1392},{"cath_id":"1.10.287.70","chopping":"1396-1570","consensus_level":"medium","plddt":81.8961,"start":1396,"end":1570},{"cath_id":"1.20.120.350","chopping":"1594-1726","consensus_level":"high","plddt":84.761,"start":1594,"end":1726},{"cath_id":"1.10.287.70","chopping":"1727-1870","consensus_level":"medium","plddt":80.102,"start":1727,"end":1870}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O43497","model_url":"https://alphafold.ebi.ac.uk/files/AF-O43497-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O43497-F1-predicted_aligned_error_v6.png","plddt_mean":58.22},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CACNA1G","jax_strain_url":"https://www.jax.org/strain/search?query=CACNA1G"},"sequence":{"accession":"O43497","fasta_url":"https://rest.uniprot.org/uniprotkb/O43497.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O43497/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O43497"}},"corpus_meta":[{"pmid":"16690884","id":"PMC_16690884","title":"Bradycardia 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parallel fiber-induced fast calcium signaling within Purkinje cell dendritic spines.","date":"2009","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/19657020","citation_count":86,"is_preprint":false},{"pmid":"26456284","id":"PMC_26456284","title":"A Recurrent Mutation in CACNA1G Alters Cav3.1 T-Type Calcium-Channel Conduction and Causes Autosomal-Dominant Cerebellar Ataxia.","date":"2015","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/26456284","citation_count":85,"is_preprint":false},{"pmid":"26715324","id":"PMC_26715324","title":"A mutation in the low voltage-gated calcium channel CACNA1G alters the physiological properties of the channel, causing spinocerebellar ataxia.","date":"2015","source":"Molecular brain","url":"https://pubmed.ncbi.nlm.nih.gov/26715324","citation_count":82,"is_preprint":false},{"pmid":"29878067","id":"PMC_29878067","title":"De novo mutation screening in childhood-onset cerebellar atrophy identifies gain-of-function mutations in the CACNA1G calcium channel gene.","date":"2018","source":"Brain : a journal of neurology","url":"https://pubmed.ncbi.nlm.nih.gov/29878067","citation_count":79,"is_preprint":false},{"pmid":"12614673","id":"PMC_12614673","title":"Immunological characterization of T-type voltage-dependent calcium channel CaV3.1 (alpha 1G) and CaV3.3 (alpha 1I) isoforms reveal differences in their localization, expression, and neural development.","date":"2003","source":"Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/12614673","citation_count":72,"is_preprint":false},{"pmid":"22469755","id":"PMC_22469755","title":"T-type voltage-activated calcium channel Cav3.1, but not Cav3.2, is involved in the inhibition of proliferation and apoptosis in MCF-7 human breast cancer cells.","date":"2012","source":"International journal of 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Mutation in brief #962. Online.","date":"2007","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/17397049","citation_count":65,"is_preprint":false},{"pmid":"20371816","id":"PMC_20371816","title":"LEF1/beta-catenin complex regulates transcription of the Cav3.1 calcium channel gene (Cacna1g) in thalamic neurons of the adult brain.","date":"2010","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/20371816","citation_count":55,"is_preprint":false},{"pmid":"16671074","id":"PMC_16671074","title":"Profiling the array of Ca(v)3.1 variants from the human T-type calcium channel gene CACNA1G: alternative structures, developmental expression, and biophysical variations.","date":"2006","source":"Proteins","url":"https://pubmed.ncbi.nlm.nih.gov/16671074","citation_count":53,"is_preprint":false},{"pmid":"19455149","id":"PMC_19455149","title":"High-density SNP association study of the 17q21 chromosomal region linked to autism identifies CACNA1G as a novel candidate gene.","date":"2009","source":"Molecular psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/19455149","citation_count":51,"is_preprint":false},{"pmid":"24268883","id":"PMC_24268883","title":"Age-related downregulation of the CaV3.1 T-type calcium channel as a mediator of amyloid beta production.","date":"2013","source":"Neurobiology of aging","url":"https://pubmed.ncbi.nlm.nih.gov/24268883","citation_count":46,"is_preprint":false},{"pmid":"28556246","id":"PMC_28556246","title":"Cacna1g is a genetic modifier of epilepsy in a mouse model of Dravet syndrome.","date":"2017","source":"Epilepsia","url":"https://pubmed.ncbi.nlm.nih.gov/28556246","citation_count":45,"is_preprint":false},{"pmid":"18414012","id":"PMC_18414012","title":"Attenuated neuropathic pain in Cav3.1 null mice.","date":"2008","source":"Molecules and 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(SAN) and atrioventricular node cells, causing bradycardia, delayed AV conduction, prolonged SAN recovery time, and slowed pacemaker activity through reduction of diastolic depolarization slope, without affecting L-type Ca2+ current or right atrial excitability.\",\n      \"method\": \"Cacna1g knockout mice; telemetric ECG; intracardiac recordings; patch-clamp of isolated SAN/AV node cells\",\n      \"journal\": \"Circulation Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple orthogonal electrophysiological and in vivo phenotypic readouts, replicated across cardiac cell types\",\n      \"pmids\": [\"16690884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Thalamic CaV3.1 T-type Ca2+ channel activation causes prolonged inhibition (>9 s) of action-potential firing in thalamic projection neurons via intracellular Ca2+ increase (independent of synaptic transmission), and focal Cre/loxP deletion of Cacna1g from the rostral-midline thalamus fragments and reduces sleep by preventing blockade of arousal signal transmission through the thalamus.\",\n      \"method\": \"CaV3.1 knockout mice; Cre/loxP conditional deletion; patch-clamp with synaptic blockers; polysomnography\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including conditional KO with specific anatomical targeting and functional sleep recordings\",\n      \"pmids\": [\"15677322\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"mGluR1 activation potentiates CaV3.1 T-type currents in cerebellar Purkinje cell dendritic spines via a G-protein- and tyrosine-phosphatase-dependent pathway; CaV3.1 channels co-localize with mGluR1 in dendritic spines and mediate fast subthreshold Ca2+ signaling potentiated during bursts of parallel fiber inputs.\",\n      \"method\": \"Whole-cell patch-clamp; ultrafast two-photon Ca2+ imaging; immunoelectron microscopy; CaV3.1 knockout animals\",\n      \"journal\": \"Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — electrophysiology combined with ultrafast imaging and KO controls with orthogonal structural validation\",\n      \"pmids\": [\"19657020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The recurrent p.Arg1715His mutation in the S4 voltage sensor of CaV3.1 causes autosomal dominant cerebellar ataxia (SCA42) by positively shifting the current-voltage and steady-state activation curves and increasing the slope factor of inactivation, resulting in decreased neuronal excitability in deep cerebellar nuclei neurons per computational modeling.\",\n      \"method\": \"Whole-cell patch-clamp in HEK293T cells expressing mutant vs. WT CaV3.1; computational neuronal modeling; exome sequencing with linkage analysis\",\n      \"journal\": \"American Journal of Human Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro electrophysiology with defined mutation, replicated independently in a second study (PMID 26715324)\",\n      \"pmids\": [\"26456284\", \"26715324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"De novo gain-of-function mutations p.Ala961Thr and p.Met1531Val in CaV3.1 drastically impair channel inactivation (approximately 5× slower kinetics, >10 mV negative shift of half-inactivation), increase neuronal firing in cerebellar nuclear neuron models, and expand a window current, causing severe childhood-onset cerebellar atrophy; both effects are blocked by the selective T-type blocker TTA-P2.\",\n      \"method\": \"Patch-clamp electrophysiology in transfected cells; computational cerebellar neuron modeling; whole-exome sequencing\",\n      \"journal\": \"Brain\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro electrophysiology with multiple mutations, pharmacological rescue, and computational modeling\",\n      \"pmids\": [\"29878067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The gamma6 subunit (long and short isoforms) specifically inhibits CaV3.1 current density by ~49-69% in HEK-293 cells and reduces endogenous LVA current in HL-1 atrial cells by 63%, without affecting voltage dependence, kinetics, or CaV3.1 mRNA/protein levels; gamma4 and gamma7 have no effect on CaV3.1.\",\n      \"method\": \"Co-expression in HEK-293 cells; whole-cell patch-clamp; Western blot; RT-PCR; GFP-tagged subunit localization\",\n      \"journal\": \"Journal of Molecular and Cellular Cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple cell types, multiple methods, isoform selectivity controls\",\n      \"pmids\": [\"15572045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The gamma6 subunit first transmembrane domain (TM1) contains a critical GxxxA motif required for physical association with CaV3.1 (confirmed by co-immunoprecipitation in HEK cells and atrial myocytes) and for reducing channel availability; mutational analysis of the GxxxA motif abolishes inhibitory function, indicating helix-helix interactions underlie gamma6 modulation of CaV3.1.\",\n      \"method\": \"Chimeric constructs; site-directed mutagenesis; co-immunoprecipitation; single-channel patch-clamp; whole-cell patch-clamp\",\n      \"journal\": \"Journal of Physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstitution with mutagenesis, co-IP in native tissue, and single-channel analysis\",\n      \"pmids\": [\"18818244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"An 8-amino acid peptide containing the GxxxA motif from gamma6 TM1 inhibits CaV3.1 current in a concentration-dependent, voltage-independent manner by dynamically binding/dissociating from the channel; both the GxxxA framework and surrounding aliphatic side-chains are required, consistent with interhelical interactions within the plasma membrane.\",\n      \"method\": \"Whole-cell electrophysiology; selective peptide mutagenesis\",\n      \"journal\": \"Molecular Pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with systematic mutagenesis of the peptide\",\n      \"pmids\": [\"19193827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The LEF1/beta-catenin transcriptional complex binds four LEF1 sites in the proximal Cacna1g promoter in thalamic neurons in vivo (chromatin immunoprecipitation), activates promoter-driven luciferase reporter activity, and increases T-type current in thalamic neurons treated with WNT3A or LiCl.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP); luciferase reporter assay; DNase I footprinting; patch-clamp of cultured thalamic neurons; WNT pathway activation\",\n      \"journal\": \"Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP in vivo combined with reporter assays and functional electrophysiology\",\n      \"pmids\": [\"20371816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Ni2+ blocks CaV3.1 pore by two mechanisms: a rapid, weakly voltage-dependent block (Kd ~1-3 mM, reduced by high permeant ion concentration) and a slow block (accelerated tail currents) that depends on permeant ion identity and concentration, with both components consistent with pore occlusion at distinct sites within the channel.\",\n      \"method\": \"Whole-cell patch-clamp; voltage-clamp; bimolecular kinetic analysis; ion substitution experiments\",\n      \"journal\": \"Journal of General Physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — systematic in vitro pharmacological characterization with rigorous biophysical analysis\",\n      \"pmids\": [\"18663132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Ca2+ and Ba2+ permeate CaV3.1 with similar apparent Kd values (~3 mM Ca2+, ~2.5 mM Ba2+); block by micromolar divalent cations is time-dependent; divalent cations shift channel activation via surface charge screening (1 e- per 98 Å2); Ba2+ accelerates inactivation by occupying the pore.\",\n      \"method\": \"Whole-cell patch-clamp; instantaneous I-V analysis; Gouy-Chapman-Stern surface charge modeling\",\n      \"journal\": \"Journal of General Physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — systematic in vitro biophysical characterization over wide concentration ranges\",\n      \"pmids\": [\"18663131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Extracellular protons shift CaV3.1 activation to more depolarized voltages and alter inactivation and deactivation kinetics; extracellular Ca2+ competes with protons for surface charges and for binding at the selectivity filter (EEDD pore locus mutation alters proton effects on selectivity); protons interact with intermediate closed states in the activation pathway.\",\n      \"method\": \"Whole-cell patch-clamp; pore-locus mutagenesis; model simulations; pH titration in HEK293 cells expressing CaV3.1\",\n      \"journal\": \"Journal of General Physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro electrophysiology with mutagenesis of selectivity filter\",\n      \"pmids\": [\"12743167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Fe2+ blocks CaV3.1 in a voltage-dependent manner (Kd 2.5 mM at 0 mV) competing with Ca2+ at the pore, and permeates the channel carrying measurable inward currents (~20 ions/s per open channel at -60 mV with 1 µM Fe2+), establishing CaV3.1 as a candidate pathway for non-transferrin-mediated Fe2+ influx.\",\n      \"method\": \"Whole-cell patch-clamp; instantaneous I-V; Woodhull and Eyring two-site/three-barrier modeling; HEK293 cells stably expressing CaV3.1\",\n      \"journal\": \"Molecular Pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — quantitative in vitro permeation study with modeling\",\n      \"pmids\": [\"22973060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Cd2+ blocks CaV3.1 in a voltage-dependent manner with relief at hyperpolarized potentials (suggesting pore permeation), carries sizable inward currents through the channel in the absence of other permeant ions, and radiolabeled 109Cd2+ uptake confirms cellular Cd2+ entry via CaV3.1.\",\n      \"method\": \"Whole-cell patch-clamp; instantaneous I-V; 109Cd2+ radiolabel uptake in HEK293 cells stably expressing CaV3.1\",\n      \"journal\": \"Molecular Pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro permeation with orthogonal radiolabel confirmation\",\n      \"pmids\": [\"22973059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Human CACNA1G undergoes extensive alternative splicing at 11 sites within the ORF plus 2 alternative promoters and 2 polyadenylation sites, generating 30 distinct transcripts; patch-clamp of 9 variants reveals combinatorial interactions between variable domains alter gating parameters; splicing patterns shift from biased/independent in fetal brain to strongly concerted in adult brain.\",\n      \"method\": \"Full-length cDNA transcript scanning (1580 cDNAs); statistical splice-site linkage analysis; whole-cell patch-clamp of selected variants; 5'-RACE\",\n      \"journal\": \"Proteins\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — large-scale transcript profiling combined with patch-clamp functional validation of multiple variants\",\n      \"pmids\": [\"16671074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Beta-adrenergic stimulation (isoproterenol/cAMP analog) increases CaV3.1-mediated T-type Ca2+ current (ICa-T3.1) in cardiomyocytes via the cAMP/PKA pathway; this effect is blocked by H89 (PKA inhibitor) and is recapitulated in native SAN cells where CaV3.1 (not CaV3.2) mediates I(Ca-T).\",\n      \"method\": \"Patch-clamp of CaV3.1 transgenic cardiomyocytes and WT/KO SAN cells; pharmacological PKA inhibition; real-time PCR\",\n      \"journal\": \"PLoS ONE\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic models (TG, KO) combined with pharmacological pathway dissection\",\n      \"pmids\": [\"22808078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cyclin-dependent kinase 5 (Cdk5) upregulates CaV3.1 T-type Ca2+ current; overexpression of Cdk5 increases macroscopic currents in HEK-293 cells stably expressing CaV3.1 and in N1E-115 neuroblastoma cells, while Cdk5 siRNA reduces them; site-directed mutagenesis identifies serine 2234 in the CaV3.1 C-terminal region as the major phosphorylation site.\",\n      \"method\": \"Whole-cell patch-clamp; Cdk5 overexpression/siRNA knockdown; site-directed mutagenesis (S2234); HEK-293 stable cells and N1E-115 cells\",\n      \"journal\": \"PLoS ONE\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mutagenesis identifies specific phosphorylation site, combined with gain/loss-of-function electrophysiology\",\n      \"pmids\": [\"25760945\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CaV3.1 associates with the KV4.2-KChIP3-DPP10c complex and CaV3.1-mediated Ca2+ entry selectively right-shifts the inactivation voltage of KV4.2 into the physiological range; this regulation was not elicited by CaV1.4, CaV2.1, or CaV2.3, demonstrating T-type channel specificity.\",\n      \"method\": \"Heterologous co-expression; whole-cell patch-clamp; co-expression of channel complexes\",\n      \"journal\": \"Channels\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single co-expression study with channel specificity controls but no co-IP or structural validation\",\n      \"pmids\": [\"20458163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CaV3.1 controls thrombin-induced von Willebrand factor (VWF) secretion from pulmonary microvascular endothelial cells (PMVECs) but not pulmonary artery endothelial cells (PAECs); T-type blocker mibefradil and CaV3.1 shRNA knockdown nearly abolish thrombin-stimulated VWF-GFP vesicle exocytosis; recombinant CaV3.1 expression in PAECs confers mibefradil-sensitive Ca2+ entry and VWF secretion.\",\n      \"method\": \"GFP-tagged VWF real-time imaging; shRNA knockdown; mibefradil pharmacology; recombinant CaV3.1 overexpression; Ca2+ imaging\",\n      \"journal\": \"American Journal of Physiology - Lung Cellular and Molecular Physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function and gain-of-function with defined molecular mechanism linking channel to secretion\",\n      \"pmids\": [\"17172292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CaV3.1 mediates a substantial inward Ca2+ current at resting membrane potentials in T helper cells; CaV3.1 knockout mice are resistant to experimental autoimmune encephalomyelitis with reduced GM-CSF production by Th1/Th17 cells and decreased NFAT nuclear translocation, without affecting TCR-initiated Ca2+ entry.\",\n      \"method\": \"Patch-clamp of T cells; CaV3.1 KO mice; EAE model; NFAT localization; cytokine secretion assays\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple functional readouts including patch-clamp, signaling, and in vivo disease model\",\n      \"pmids\": [\"27037192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CaV3.1 knockout mice show attenuated neuropathic pain after L5 spinal nerve ligation, with reduced spontaneous pain responses, increased mechanical pain threshold, and reduced thermal hyperalgesia, establishing CaV3.1 as a required contributor to neuropathic pain development.\",\n      \"method\": \"CaV3.1 (alpha1G-/-) knockout mice; behavioral pain assays (spinal nerve ligation model); mechanical and thermal thresholds\",\n      \"journal\": \"Molecules and Cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple behavioral pain endpoints\",\n      \"pmids\": [\"18414012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Decreased Cacna1g expression partially ameliorates Scn1a+/- Dravet syndrome phenotype (improved survival, reduced spontaneous seizure frequency) while increased Cacna1g expression worsens Scn2aQ54 epilepsy (elevated seizure frequency), establishing Cacna1g as a genetic modifier that operates in epistasis with sodium channel genes.\",\n      \"method\": \"Transgenic alteration of Cacna1g expression in Scn1a+/- and Scn2aQ54 mouse models; seizure monitoring; survival analysis\",\n      \"journal\": \"Epilepsia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in two independent epilepsy mouse models with bidirectional modifier effects\",\n      \"pmids\": [\"28556246\", \"27112236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CaV3.1 T-type Ca2+ channel is the dominant voltage-gated Ca2+ channel in mouse preadipocytes (C2C12 and primary); siRNA knockdown of alpha1G abolishes low-threshold Ca2+ current; mibefradil and NNC55-0396 block preadipocyte proliferation and prevent cell cycle entry/progression, while CaV3.1 expression decreases upon adipocyte differentiation.\",\n      \"method\": \"Patch-clamp; RT-PCR; Western blot; siRNA knockdown; immunohistochemistry; cell proliferation and cell cycle assays\",\n      \"journal\": \"American Journal of Physiology - Cell Physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods with siRNA confirming channel identity and pharmacological cell cycle phenotype\",\n      \"pmids\": [\"20457833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CaV3.1 T-type Ca2+ channel expression is upregulated in pulmonary artery smooth muscle cells by IGF-I through PI3K/Akt signaling; CaV3.1 knockdown (RNAi) prevents IGF-I-induced cyclin D expression/activation and cell cycle progression, linking T-type Ca2+ entry to mitogenic signaling.\",\n      \"method\": \"RT-PCR; Western blot; RNAi knockdown; patch-clamp; PI3K/Akt pathway inhibitors; cell cycle analysis\",\n      \"journal\": \"American Journal of Physiology - Cell Physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — RNAi with defined pathway placement (PI3K/Akt → CaV3.1 → cyclin D)\",\n      \"pmids\": [\"21148410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Domain IV is the primary determinant of CaV3.1 vs. CaV3.3 differences in activation time constant and recovery from inactivation; domains I and IV together determine half-activation potential; the carboxy-terminal region is not involved; multiple domains collectively control inactivation kinetics.\",\n      \"method\": \"Chimeric channel constructs swapping transmembrane domains I-IV; whole-cell patch-clamp in tsA-201 cells\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — systematic chimeric mutagenesis with electrophysiological characterization\",\n      \"pmids\": [\"16996222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"BMP4 upregulates CaV3.1 mRNA and T-type Ca2+ current in HL-1 atrial myocytes through a ROS/MAPK (JNK and p38) pathway involving NADPH oxidase-4 (NOX4); inhibitors of NADPH oxidase, radical scavengers, and JNK/p38 inhibitors block BMP4-induced CaV3.1 upregulation.\",\n      \"method\": \"Patch-clamp; real-time PCR; MAPK/NOX4 pathway inhibitors; noggin BMP4 inhibitor; HL-1 cells\",\n      \"journal\": \"Pflugers Archiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — pharmacological pathway dissection without direct phosphorylation site identification\",\n      \"pmids\": [\"24510064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Overexpression of full-length CaV3.1 suppresses MCF-7 breast cancer cell proliferation and increases apoptosis (Annexin V/TUNEL positive cells localize CaV3.1 to plasma membrane); CaV3.1 knockdown promotes proliferation and blocks cyclophosphamide-induced apoptosis; CaV3.2 manipulation has no effect on proliferation.\",\n      \"method\": \"CaV3.1 overexpression and siRNA knockdown; apoptosis assays (Annexin V, TUNEL); immunocytochemistry; cell proliferation assays; ProTx-I pharmacology\",\n      \"journal\": \"International Journal of Oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — gain and loss of function with apoptosis phenotype, but mechanistic pathway not fully defined\",\n      \"pmids\": [\"22469755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Roscovitine blocks CaV3.1 channels preferentially at depolarized voltages (EC50 10 µM) by negatively shifting closed-state inactivation voltage dependence, accelerating closed-state inactivation, and slowing recovery from inactivation, without major effects on open-state inactivation or deactivation.\",\n      \"method\": \"Transient expression in HEK293 cells; whole-cell patch-clamp; voltage protocols dissecting inactivation states\",\n      \"journal\": \"Journal of Pharmacology and Experimental Therapeutics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro electrophysiology with defined mechanistic dissection of inactivation states\",\n      \"pmids\": [\"22088954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CaV3.1 is expressed in the plasma membrane of outer hair cells (OHCs) in adult rat cochlea (but not inner hair cells at protein level); patch-clamp reveals a transient low-threshold inward Ca2+ current from -100 mV holding potential that is blocked by 1 µM mibefradil, establishing functional CaV3.1 T-type channel activity in mature OHCs.\",\n      \"method\": \"In situ hybridization; immunohistochemistry; Western blot; patch-clamp with mibefradil pharmacology\",\n      \"journal\": \"Brain Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — morphological plus electrophysiological evidence but limited functional consequence established\",\n      \"pmids\": [\"18294617\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CaV3.1 is predominantly localized in neuronal progenitor cells of the mouse hippocampal dentate gyrus; CaV3.1 knockout mice show decreased proliferation and survival of newly generated cells, impaired neuronal differentiation, reduced CaMKII and Akt phosphorylation, decreased BDNF expression, and impaired social interaction.\",\n      \"method\": \"CaV3.1 KO mice; BrdU cell labeling; doublecortin immunostaining; immunohistochemistry; Western blot; gene ontology analysis\",\n      \"journal\": \"Acta Physiologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple cellular readouts and downstream signaling analysis, though pathway placement is correlative\",\n      \"pmids\": [\"33393208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CaV3.1 expression in dmVMH neurons mediates burst firing; optogenetically evoked burst firing induces anxiety-like behavior and shifts energy metabolism toward fat oxidation; Cav3.1 knockdown in dmVMH has opposite effects; fluoxetine blocks chronic stress-induced Cav3.1 upregulation and burst firing.\",\n      \"method\": \"Optogenetics; Cav3.1 knockdown; respiratory exchange ratio measurement; behavioral assays; in vivo electrophysiology\",\n      \"journal\": \"Molecular Psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional manipulation with defined circuit-level and behavioral outcomes\",\n      \"pmids\": [\"35318460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In human thalamocortical assembloids, the M1531V gain-of-function CACNA1G variant increases T-type currents in thalamic neurons and causes correlated hyperactivity of thalamic and cortical neurons; CACNA1G loss-of-function results in abnormal thalamocortical connectivity through increased spontaneous thalamic activity and aberrant axonal projections.\",\n      \"method\": \"Human iPSC-derived thalamocortical assembloids; patch-clamp; calcium imaging; axonal projection analysis; CACNA1G KO and GOF variant engineering\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human system with multiple orthogonal readouts at cellular and circuit level\",\n      \"pmids\": [\"39419023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Insulin upregulates CaV3.1 T-type Ca2+ current in GH3 pituitary cells through increased endosomal recycling and membrane incorporation of channels, not via transcriptional upregulation; disruption of endosomal recycling by Brefeldin A or dominant-negative Rab11a prevents insulin's stimulatory effects.\",\n      \"method\": \"Patch-clamp; real-time RT-PCR; Western blot; luciferase reporter; Brefeldin A treatment; dominant-negative Rab11a expression in HEK-293/Cav3.1 cells\",\n      \"journal\": \"Cell Calcium\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — orthogonal approaches distinguishing transcriptional vs. trafficking mechanism, but single lab\",\n      \"pmids\": [\"22770883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CaV3.1 (but not CaV3.2) is required for stimulated ERK1/2 phosphorylation in response to serum, PDGF, and TGF-β1 in mouse mesangial cells; CRISPR-Cas9 knockout of CaV3.1 abolishes stimulated phospho-ERK1/2, whereas CaV3.2 KO retains these responses.\",\n      \"method\": \"CRISPR-Cas9 single/double KO of CaV3.1 and CaV3.2; ERK1/2 phosphorylation assays; proliferation assays; pharmacological TTCC inhibitors\",\n      \"journal\": \"BMC Nephrology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO with isoform-specific controls, but mechanistic link between Ca2+ entry and ERK not directly established\",\n      \"pmids\": [\"35710406\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CAV3.1 knockdown in prostate cancer cells inhibits proliferation, migration, and invasion by suppressing AKT activity, leading to decreased CCND1, N-cadherin, and Vimentin and increased E-cadherin; ectopic AKT expression rescues these effects.\",\n      \"method\": \"CAV3.1 siRNA knockdown; ectopic AKT expression rescue; CCK-8; cell cycle; transwell invasion; Western blot in prostate cancer cells\",\n      \"journal\": \"Cancer Management and Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — loss-of-function with rescue experiment defining AKT pathway, single lab\",\n      \"pmids\": [\"30410396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The CACNA1G gene has two functional promoters (A and B) generating transcripts with different 5'-UTRs; promoter A is favored in undifferentiated Y79 cells and promoter B in differentiated cells; promoter A activity decreases during differentiation (with upstream enhancer/repressor sequences identified), explaining down-regulation of CaV3.1 expression during neuronal differentiation.\",\n      \"method\": \"RT-PCR; 5'-RACE; promoter-luciferase reporter assays; cloning of genomic DNA\",\n      \"journal\": \"European Journal of Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reporter assays with defined promoter elements, single lab\",\n      \"pmids\": [\"12752779\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Dexamethasone (glucocorticoid) increases CaV3.1 mRNA and T-type Ca2+ current in neonatal cardiac myocytes through glucocorticoid receptor (GR) and NFκB; functional glucocorticoid response elements (GREs) are identified in the Cacna1g promoter, with GRE-1 mediating aldosterone response and GRE-4/GRE-5 mediating dexamethasone response.\",\n      \"method\": \"Patch-clamp; RT-PCR; promoter-luciferase reporter; site-directed mutagenesis of GREs; GR antagonist RU38486; NFκB inhibitor PDTC\",\n      \"journal\": \"Molecular and Cellular Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis of promoter elements combined with pharmacological dissection, single lab\",\n      \"pmids\": [\"18820838\", \"19705257\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Leucine directly binds a hydrophobic pocket of the CaV3.1 voltage-sensing segment and lowers the threshold for voltage-dependent activation; pharmacological inhibition of CaV3.1 blunts leucine-induced POMC neuron activation; genetic deletion of Cacna1g in POMC neurons abolishes appetite- and weight-suppressive effects of high-protein feeding.\",\n      \"method\": \"Pharmacological inhibition in cultured neurons and brain slices; conditional Cacna1g KO in POMC neurons; in vivo hypothalamic leucine injection; diet-induced obesity model; structural binding analysis\",\n      \"journal\": \"Cell Metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct leucine-channel binding with multiple orthogonal methods including conditional KO, pharmacology, and brain slice electrophysiology\",\n      \"pmids\": [\"42025169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CACNA1G loss-of-function in Xenopus tropicalis reduces cilia quantity in the left-right organizer (LRO), causing disrupted LR patterning markers (pitx2c and dand5) and cardiac looping defects, establishing a role for CaV3.1 in ciliogenesis and LR asymmetry.\",\n      \"method\": \"CRISPR crispants in Xenopus tropicalis; in situ hybridization of LR markers; morphological analysis of LRO cilia; cardiac looping assessment\",\n      \"journal\": \"Genesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR loss-of-function with multiple readouts, but mechanism linking channel to ciliogenesis not established\",\n      \"pmids\": [\"40008628\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CaV3.1 knockout in the alpha1 GABAA receptor null background (double mutant mice) causes severe motor abnormalities, potentiated tremor at 20 Hz refractory to propranolol, and age-dependent loss of cerebellar Purkinje neurons, revealing a role for CaV3.1 in motor coordination under pathological conditions.\",\n      \"method\": \"Double knockout mice (alpha1-/- / alpha1G-/-); tremor activity measurement; rotarod motor learning; propranolol pharmacology; cerebellar histology\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis experiment with defined cellular (Purkinje cell loss) and behavioral readouts, single lab\",\n      \"pmids\": [\"21621520\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CACNA1G encodes CaV3.1, the pore-forming subunit of a low-voltage-activated T-type calcium channel that is gated by membrane depolarization near resting potential, selectively permeates Ca2+ (and divalent metal ions including Fe2+ and Cd2+) through an EEDD selectivity filter, is modulated post-translationally by Cdk5-mediated phosphorylation at Ser2234, inhibited by the gamma6 subunit via a GxxxA TM1 motif, upregulated by beta-adrenergic/PKA, BMP4/ROS/MAPK, glucocorticoid/GR/NFκB, and Wnt/LEF1/beta-catenin pathways, directly bound and activated by leucine at the voltage-sensing segment to regulate hypothalamic POMC neuron satiety signaling, and plays defined roles in cardiac pacemaking, thalamic sleep stabilization, cerebellar Purkinje cell function, neuropathic pain, T cell cytokine production, and adult hippocampal neurogenesis; gain-of-function mutations impair channel inactivation and cause autosomal dominant cerebellar ataxia or neurodevelopmental encephalopathies, while loss of function reduces channel availability and acts as a genetic modifier of sodium channelopathy-associated epilepsy.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CACNA1G encodes CaV3.1, the pore-forming α1 subunit of a low-voltage-activated (T-type) calcium channel that opens near resting membrane potential to conduct transient inward Ca²⁺ currents critical for rhythmic burst firing, pacemaker depolarization, and subthreshold calcium signaling across diverse excitable and non-excitable cell types. CaV3.1-mediated Ca²⁺ entry drives diastolic depolarization in sinoatrial and atrioventricular node cells for cardiac pacemaking [PMID:16690884], sustains thalamic action-potential silencing required for sleep maintenance [PMID:15677322], supports mGluR1-potentiated dendritic spine Ca²⁺ transients in cerebellar Purkinje cells [PMID:19657020], enables NFAT-dependent GM-CSF production in T helper cells [PMID:27037192], mediates leucine-sensing activation of hypothalamic POMC neurons to suppress appetite [PMID:42025169], and promotes adult hippocampal neurogenesis via CaMKII/Akt/BDNF signaling [PMID:33393208]. Channel activity is tuned by extensive alternative splicing that combinatorially adjusts gating [PMID:16671074], post-translational regulation including Cdk5 phosphorylation at Ser2234 [PMID:25760945] and β-adrenergic/PKA-dependent enhancement [PMID:22808078], inhibition by the γ6 subunit through a GxxxA transmembrane motif [PMID:18818244], and transcriptional control by Wnt/LEF1/β-catenin [PMID:20371816] and glucocorticoid/GR/NFκB pathways [PMID:18820838]. Gain-of-function missense mutations that impair channel inactivation cause autosomal dominant spinocerebellar ataxia (SCA42) and childhood-onset cerebellar atrophy [PMID:26456284, PMID:29878067], while altered Cacna1g dosage modifies seizure severity in sodium channelopathy models of epilepsy [PMID:27112236].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Defining how extracellular protons and Ca²⁺ interact at the CaV3.1 selectivity filter (EEDD locus) established the biophysical basis of pore selectivity and gating modulation by pH.\",\n      \"evidence\": \"Pore-locus mutagenesis with pH titration and patch-clamp in HEK293 cells expressing CaV3.1\",\n      \"pmids\": [\"12743167\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural resolution of proton binding sites\", \"In vivo relevance of pH modulation not tested\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identification of two functional promoters (A and B) with differentiation-dependent switching explained how CaV3.1 transcription is regulated during neuronal maturation.\",\n      \"evidence\": \"5'-RACE, promoter-luciferase reporters in Y79 retinoblastoma cells\",\n      \"pmids\": [\"12752779\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Promoter switching not validated in primary neurons in vivo\", \"Trans-acting factors not identified\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrating that the γ6 subunit specifically inhibits CaV3.1 current density without altering gating or expression levels revealed a dedicated auxiliary subunit mechanism for T-type channel regulation.\",\n      \"evidence\": \"Co-expression in HEK-293 and HL-1 atrial cells with patch-clamp and protein quantification\",\n      \"pmids\": [\"15572045\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of current reduction (trafficking vs. gating) not resolved at this stage\", \"In vivo significance not tested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Conditional deletion of Cacna1g from rostral-midline thalamus established that CaV3.1-dependent prolonged firing inhibition is the mechanism by which the thalamus gates arousal signals to stabilize sleep.\",\n      \"evidence\": \"Cre/loxP conditional KO; patch-clamp with synaptic blockers; polysomnography in mice\",\n      \"pmids\": [\"15677322\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream Ca²⁺-dependent effectors mediating 9-second firing inhibition not identified\", \"Circuit-level mechanism of arousal signal blockade not mapped\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Global Cacna1g knockout abolishing T-type current in SAN/AV node cells and causing bradycardia definitively established CaV3.1 as the molecular basis of T-type current-driven cardiac pacemaking.\",\n      \"evidence\": \"Cacna1g KO mice; telemetric ECG; patch-clamp of isolated SAN/AV node cells\",\n      \"pmids\": [\"16690884\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of CaV3.1 vs. HCN channels to pacemaker depolarization under physiological conditions not quantified\", \"Compensatory mechanisms in KO not excluded\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Comprehensive transcript profiling revealing 30 splice variants with combinatorial gating effects and developmentally regulated splicing patterns established that alternative splicing is a major mechanism for CaV3.1 functional diversification.\",\n      \"evidence\": \"Scanning of 1580 full-length cDNAs; patch-clamp of 9 selected variants; 5'-RACE\",\n      \"pmids\": [\"16671074\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional significance of most variant combinations untested\", \"Cell-type-specific splice variant expression not mapped\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Chimeric domain-swapping between CaV3.1 and CaV3.3 identified domain IV as the primary determinant of activation kinetics and recovery from inactivation, localizing key gating differences to specific structural modules.\",\n      \"evidence\": \"Chimeric channel constructs with whole-cell patch-clamp in tsA-201 cells\",\n      \"pmids\": [\"16996222\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific residues within domain IV responsible not identified\", \"No structural model available\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showing that CaV3.1 controls thrombin-induced VWF secretion from pulmonary microvascular endothelial cells extended the channel's functional repertoire beyond excitable cells to regulated exocytosis in endothelium.\",\n      \"evidence\": \"shRNA knockdown and recombinant CaV3.1 overexpression; GFP-VWF real-time imaging; Ca²⁺ imaging\",\n      \"pmids\": [\"17172292\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ca²⁺ microdomain coupling between CaV3.1 and secretory machinery not characterized\", \"Relevance to hemostasis in vivo not tested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Mutational analysis of the γ6 GxxxA transmembrane motif, combined with co-IP in native atrial myocytes, established that helix-helix interactions within the membrane underlie γ6-mediated CaV3.1 inhibition, and a synthetic GxxxA peptide could recapitulate this inhibition.\",\n      \"evidence\": \"Site-directed mutagenesis; co-IP in HEK cells and atrial myocytes; single-channel and whole-cell patch-clamp; peptide electrophysiology\",\n      \"pmids\": [\"18818244\", \"19193827\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding interface on CaV3.1 not mapped\", \"Stoichiometry of γ6-CaV3.1 complex unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Systematic permeation studies with Ni²⁺, Ca²⁺, Ba²⁺, and surface charge analysis defined the biophysical principles of CaV3.1 ion selectivity and pore block, establishing a quantitative framework for divalent cation interactions at two distinct pore sites.\",\n      \"evidence\": \"Whole-cell patch-clamp with ion substitution, Woodhull modeling, and Gouy-Chapman-Stern analysis in HEK293 cells\",\n      \"pmids\": [\"18663132\", \"18663131\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No atomic-resolution pore structure available\", \"Physiological relevance of surface charge effects in native membranes not tested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Attenuated neuropathic pain in CaV3.1 KO mice after spinal nerve ligation identified the channel as a required contributor to neuropathic pain processing.\",\n      \"evidence\": \"CaV3.1 KO mice; behavioral pain assays with mechanical and thermal thresholds\",\n      \"pmids\": [\"18414012\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spinal vs. supraspinal site of action not determined\", \"Downstream signaling from CaV3.1 Ca²⁺ entry to pain sensitization unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identification of functional glucocorticoid response elements in the Cacna1g promoter established a transcriptional mechanism for corticosteroid-mediated upregulation of T-type current in cardiomyocytes.\",\n      \"evidence\": \"Promoter-luciferase with GRE mutagenesis; GR antagonist; NFκB inhibitor; patch-clamp in neonatal cardiomyocytes\",\n      \"pmids\": [\"18820838\", \"19705257\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GR occupancy at endogenous Cacna1g GREs not shown by ChIP\", \"Physiological significance of glucocorticoid regulation in adult heart not tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrating mGluR1-dependent potentiation of CaV3.1 in cerebellar Purkinje cell dendritic spines established a T-type channel-mediated fast Ca²⁺ signaling mechanism for synaptic integration of parallel fiber inputs.\",\n      \"evidence\": \"Whole-cell patch-clamp; ultrafast two-photon Ca²⁺ imaging; immunoelectron microscopy; CaV3.1 KO animals\",\n      \"pmids\": [\"19657020\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream Ca²⁺ effectors in dendritic spines not identified\", \"Behavioral consequence of impaired spine Ca²⁺ signaling not tested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"ChIP demonstrating LEF1/β-catenin binding to the Cacna1g promoter in thalamic neurons in vivo, combined with WNT3A-induced T-type current increases, established Wnt signaling as a transcriptional activator of CaV3.1 in the brain.\",\n      \"evidence\": \"Chromatin immunoprecipitation; luciferase reporter; DNase I footprinting; patch-clamp of cultured thalamic neurons\",\n      \"pmids\": [\"20371816\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Wnt-driven CaV3.1 upregulation contributes to thalamic oscillations in vivo not tested\", \"Other Wnt target genes acting in parallel not controlled for\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identification of CaV3.1 as the dominant voltage-gated Ca²⁺ channel in preadipocytes required for cell cycle entry, and its upregulation by IGF-I/PI3K/Akt in pulmonary artery smooth muscle cells linking it to cyclin D expression, established CaV3.1 as a proliferative signal in non-neuronal mitogenic pathways.\",\n      \"evidence\": \"siRNA/RNAi knockdown; patch-clamp; cell cycle analysis; PI3K/Akt inhibitors in C2C12, primary preadipocytes, and PASMC\",\n      \"pmids\": [\"20457833\", \"21148410\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct Ca²⁺-dependent mechanism linking channel opening to cyclin D induction not identified\", \"In vivo significance for adipogenesis or vascular remodeling not tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Quantitative permeation studies showing Fe²⁺ and Cd²⁺ transit through the CaV3.1 pore (with radiolabel confirmation for Cd²⁺) established T-type channels as candidate pathways for toxic and essential divalent metal ion entry into cells.\",\n      \"evidence\": \"Patch-clamp with Eyring barrier modeling; ¹⁰⁹Cd²⁺ radiolabel uptake in HEK293-CaV3.1 stable cells\",\n      \"pmids\": [\"22973060\", \"22973059\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of Fe²⁺/Cd²⁺ permeation in native tissues not demonstrated\", \"Relative contribution vs. dedicated metal transporters unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"β-adrenergic/PKA-dependent enhancement of CaV3.1 current in SAN cells identified a neurohumoral mechanism for autonomic modulation of T-type channel activity in cardiac pacemaking.\",\n      \"evidence\": \"Patch-clamp of CaV3.1 transgenic cardiomyocytes and WT/KO SAN cells; PKA inhibitor H89\",\n      \"pmids\": [\"22808078\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PKA phosphorylation site on CaV3.1 not identified\", \"Contribution to heart rate increase in vivo not quantified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Insulin-stimulated CaV3.1 membrane insertion via Rab11a-dependent endosomal recycling revealed a post-translational trafficking mechanism for acute regulation of T-type current independent of transcription.\",\n      \"evidence\": \"Patch-clamp; Brefeldin A treatment; dominant-negative Rab11a in HEK-293/CaV3.1 and GH3 pituitary cells\",\n      \"pmids\": [\"22770883\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct visualization of CaV3.1 endosomal trafficking not performed\", \"Insulin signaling intermediates connecting to Rab11a not identified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identification of CaV3.1 Ser2234 as the Cdk5 phosphorylation site that increases T-type current defined a specific kinase-substrate relationship for post-translational channel modulation in neurons.\",\n      \"evidence\": \"Site-directed mutagenesis; Cdk5 overexpression/siRNA; patch-clamp in HEK-293 and N1E-115 cells\",\n      \"pmids\": [\"25760945\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo phosphorylation at Ser2234 not confirmed\", \"Downstream physiological consequence of Cdk5-CaV3.1 regulation not established\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"The p.Arg1715His mutation in the CaV3.1 S4 voltage sensor shifting activation and inactivation established the first causal link between CACNA1G gain-of-function and autosomal dominant spinocerebellar ataxia (SCA42).\",\n      \"evidence\": \"Whole-cell patch-clamp of mutant vs. WT in HEK293T; computational modeling; exome sequencing with linkage in families\",\n      \"pmids\": [\"26456284\", \"26715324\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Patient-derived neuronal validation not performed at this stage\", \"Mechanism of selective cerebellar vulnerability not explained\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"CaV3.1 KO mice resisting EAE with reduced T-helper GM-CSF production and impaired NFAT nuclear translocation established an unexpected role for T-type channels in adaptive immune cell activation.\",\n      \"evidence\": \"CaV3.1 KO mice; EAE model; patch-clamp of T cells; NFAT localization; cytokine assays\",\n      \"pmids\": [\"27037192\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How resting-potential T-type Ca²⁺ entry triggers NFAT without store depletion is mechanistically unclear\", \"Contribution relative to CRAC/Orai channels not quantified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Bidirectional modification of seizure severity in two sodium channelopathy epilepsy models by Cacna1g dosage established the gene as a genetic modifier operating in epistasis with SCN1A and SCN2A.\",\n      \"evidence\": \"Transgenic Cacna1g alteration in Scn1a⁺/⁻ and Scn2aQ54 mouse models; seizure and survival monitoring\",\n      \"pmids\": [\"28556246\", \"27112236\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of T-type/Na⁺ channel epistasis at the circuit level not resolved\", \"Human genetic modifier studies not performed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"De novo mutations p.Ala961Thr and p.Met1531Val causing dramatic inactivation impairment and childhood cerebellar atrophy, rescuable by TTA-P2, expanded the genotype-phenotype spectrum and demonstrated pharmacological tractability of CaV3.1 channelopathies.\",\n      \"evidence\": \"Patch-clamp of transfected cells; TTA-P2 pharmacology; computational cerebellar neuron modeling; whole-exome sequencing\",\n      \"pmids\": [\"29878067\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo TTA-P2 rescue not attempted\", \"Mechanism of selective cerebellar neuron vulnerability still unexplained\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"CaV3.1 localization to hippocampal neural progenitors and KO-associated deficits in proliferation, differentiation, and BDNF/CaMKII/Akt signaling established the channel as a regulator of adult hippocampal neurogenesis.\",\n      \"evidence\": \"CaV3.1 KO mice; BrdU labeling; doublecortin immunostaining; Western blot for signaling pathways\",\n      \"pmids\": [\"33393208\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal link between CaV3.1 Ca²⁺ entry and specific downstream kinase activation is correlative\", \"Cell-autonomous vs. non-cell-autonomous effects not distinguished\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"CaV3.1-driven burst firing in dorsomedial VMH neurons inducing anxiety-like behavior and shifting energy metabolism toward fat oxidation established a defined hypothalamic circuit role for CaV3.1 in stress and metabolism.\",\n      \"evidence\": \"Optogenetics; Cav3.1 knockdown; respiratory exchange ratio; behavioral assays; in vivo electrophysiology\",\n      \"pmids\": [\"35318460\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream neuropeptide or neurotransmitter mediators not identified\", \"Human relevance not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Human thalamocortical assembloids carrying the M1531V GOF variant or CACNA1G KO demonstrated that both gain and loss of CaV3.1 function disrupt thalamocortical connectivity, validating channel-dependent circuit assembly in a human model system.\",\n      \"evidence\": \"iPSC-derived thalamocortical assembloids; patch-clamp; calcium imaging; axonal projection analysis\",\n      \"pmids\": [\"39419023\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether connectivity defects are reversible with T-type blockers not tested\", \"Correlation with patient phenotypes not directly established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Discovery that leucine directly binds the CaV3.1 voltage-sensing segment to lower activation threshold, activating hypothalamic POMC neurons and suppressing appetite, revealed the channel as a molecular sensor coupling amino acid availability to satiety signaling.\",\n      \"evidence\": \"Conditional Cacna1g KO in POMC neurons; hypothalamic leucine injection; structural binding analysis; brain slice electrophysiology; diet-induced obesity model\",\n      \"pmids\": [\"42025169\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic structure of leucine-binding pocket not fully resolved\", \"Whether other amino acids share this binding mode unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"CACNA1G loss-of-function in Xenopus reducing LRO cilia and disrupting left-right patterning revealed an unexpected developmental role for CaV3.1 in ciliogenesis.\",\n      \"evidence\": \"CRISPR crispants in Xenopus tropicalis; in situ hybridization; LRO cilia morphological analysis\",\n      \"pmids\": [\"40008628\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking CaV3.1 Ca²⁺ entry to ciliogenesis completely unknown\", \"Not confirmed in mammalian systems\", \"Channel-independent effects of CRISPR not excluded\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the atomic structure of the CaV3.1 channel, the mechanism by which low-voltage Ca²⁺ entry selectively activates NFAT in T cells, the basis of cerebellar vulnerability in CACNA1G channelopathies, and whether T-type channel blockers can be developed as therapeutics for SCA42 or neurodevelopmental encephalopathies.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution cryo-EM structure of CaV3.1 reported\", \"Therapeutic window for T-type blockers in channelopathies not established\", \"Cell-type-specific splice variant functions largely unmapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 2, 9, 10, 11, 12, 13]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [37]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 5, 6, 18, 19, 28]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [1, 2, 30, 31]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 15, 23, 36, 37]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [19]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 10, 12, 13]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CACNG6\",\n      \"GRM1\",\n      \"LEF1\",\n      \"CDK5\",\n      \"RAB11A\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}