{"gene":"CACNA1E","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":1994,"finding":"The CaV2.3 (BII/α1E) channel is a high-voltage-activated calcium channel with unique Ni2+ sensitivity: its decaying current component shows high Ni2+ sensitivity similar to low-voltage-activated channels, while the sustained component is relatively resistant. It is insensitive to dihydropyridines, ω-CgTx-GVIA, and ω-Aga-IVA. Coexpression with the β subunit decelerates both activation and inactivation rates (opposite to L-type), and further coexpression of α2 subunit cancels this β effect.","method":"Xenopus oocyte expression, whole-cell electrophysiology, pharmacological profiling, auxiliary subunit co-expression","journal":"Receptors & channels","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted channel from cloned cDNA in oocyte system with pharmacological and subunit co-expression analysis; single lab but multiple orthogonal electrophysiology approaches","pmids":["7719708"],"is_preprint":false},{"year":2001,"finding":"Voltage-dependent inactivation of CaV2.3 is controlled by position R378 (position 5 of the AID motif) in the I-II linker: substitution with negatively charged residues (Glu or Asp) slows inactivation kinetics and shifts voltage dependence of inactivation to more positive voltages, while positively charged residues promote inactivation. This residue plays a significant role in inactivation gating.","method":"Site-directed mutagenesis, whole-cell patch-clamp electrophysiology in Xenopus oocytes","journal":"Biophysical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — systematic mutagenesis of multiple residues combined with functional electrophysiology; single lab but multiple mutations tested with consistent results","pmids":["11159396"],"is_preprint":false},{"year":2004,"finding":"PKC-mediated stimulation of CaV2.3 requires an arginine-rich region in the cytosolic II-III loop: phorbol ester activation of PKC augments CaV2.3 Ba2+ currents (~60%) and increases non-inactivating fraction (~3-fold), but this modulation is abolished when the arginine-rich region of the II-III loop is eliminated. This represents a positive feedback mechanism linking Ca2+ influx through other channels to CaV2.3 activation via PKC.","method":"Site-directed mutagenesis of II-III loop, whole-cell patch-clamp in HEK-293 cells, PKC inhibitor pharmacology","journal":"The European journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with functional electrophysiology and pharmacological inhibition in heterologous expression system; identifies a specific molecular determinant","pmids":["15147300"],"is_preprint":false},{"year":2004,"finding":"The C-terminal residues Trp13 and Ile14 of the AID helix in the I-II linker of CaV2.3 anchor CaVβ subunit functional modulation: Ile14 mutations to charged residues (Asp, Glu, Arg, Lys) abolish CaVβ3 binding and modulation, while I14L preserves modulation. A hydrophobic pocket at position 14 accounts for the strict structural specificity of the CaVβ interaction.","method":"Alanine-scanning and site-directed mutagenesis, [35S]CaVβ overlay binding assay, whole-cell electrophysiology in HEK cells, 3D homology modeling","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple mutagenesis combined with binding assay and functional electrophysiology; single lab with orthogonal methods","pmids":["15507442"],"is_preprint":false},{"year":2004,"finding":"Muscarinic M1, M3, and M5 receptors (Gαq/11-coupled) stimulate CaV2.3 through a pathway involving Gαq/11, diacylglycerol, and a Ca2+-independent PKC (specifically blocked by neutralizing anti-Gαq/11 antibodies, PKCδ regulatory domain, phorbol ester pre-activation, or bisindolylmaleimide I). Muscarinic inhibition of CaV2.3 is mediated by Gβγ subunits, and PKC-mediated stimulation cross-talks with Gβγ-mediated inhibition.","method":"Heterologous expression in HEK cells, whole-cell patch-clamp, pharmacological inhibitors, neutralizing antibodies, co-expression of signaling pathway components","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple pharmacological approaches and co-expression of dominant-negative constructs in a single rigorous study; single lab","pmids":["14742680"],"is_preprint":false},{"year":2005,"finding":"CaV2.3 channels specifically control second-phase insulin release from pancreatic beta cells: CaV2.3 knockout or pharmacological block with SNX-482 suppresses second-phase secretion while leaving first-phase unaffected. CaV2.3 ablation also reduces oscillatory Ca2+ signaling and granule recruitment after the initial exocytotic burst.","method":"CaV2.3 knockout mice, dynamic insulin release measurements, pharmacological block with SNX-482, single beta cell Ca2+ imaging, capacitance measurements","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout combined with pharmacological blockade and multiple functional readouts; replicated with two independent approaches (KO and SNX-482)","pmids":["15630454"],"is_preprint":false},{"year":2006,"finding":"The molecular chaperone hsp70 interacts with the cytosolic II-III loop of CaV2.3 and may act as an adaptor for Ca2+-dependent targeting of PKC to E-type channels. Immunopurified II-III loop protein stimulates PKCα autophosphorylation.","method":"FLAG-tagged II-III loop overexpression in HEK 293 cells, immunopurification, identification of hsp70 as interaction partner, PKC autophosphorylation assay","journal":"Cellular physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single Co-IP/pulldown approach identifying hsp70 interaction; single lab, limited functional follow-up","pmids":["16543726"],"is_preprint":false},{"year":2007,"finding":"Hydrophobic residues in the IVS6 transmembrane segment of CaV2.3 (specifically the VAVIM motif) control the relative stability of the channel closed and open states: glycine substitutions at positions equivalent to Val1720 (in IS6, IIS6, IIIS6, and IVS6) produce slow inactivating currents with hyperpolarizing activation shifts, indicating that hydrophobic residues at these positions promote the channel closed state.","method":"Glycine-scanning mutagenesis of IVS6 (and equivalent positions in IS6, IIS6, IIIS6), whole-cell patch-clamp in heterologous expression, 3D homology modeling based on Kv1.2","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — systematic mutagenesis of multiple positions combined with functional electrophysiology and structural modeling; single lab but extensive mutant series","pmids":["17660294"],"is_preprint":false},{"year":2007,"finding":"CaV2.3 channels play a critical role in hippocampal ictogenesis and neuronal degeneration after excitotoxic events: CaV2.3-deficient mice show dramatic resistance to kainic acid-induced limbic seizures and absence of excitotoxic cell death in hippocampus after kainate, while wild-type mice exhibit clear excitotoxic neurodegeneration.","method":"CaV2.3 knockout mice, kainic acid and NMDA seizure models, surface and deep telemetric EEG recordings, histochemical analysis of hippocampal excitotoxicity","journal":"Journal of neurophysiology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic knockout with multiple functional readouts (behavioral, EEG, histological); single lab","pmids":["17376845"],"is_preprint":false},{"year":2008,"finding":"Eugenol inhibits CaV2.3 calcium channel currents in a TRPV1-independent manner, demonstrating a distinct mechanism from capsaicin (which requires TRPV1 for CaV2.3 inhibition).","method":"Whole-cell patch-clamp in E52 cell line stably expressing human CaV2.3, comparison between TRPV1-expressing and naïve cells","journal":"Journal of dental research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean pharmacological experiment in stable cell line distinguishing mechanism from capsaicin; single lab, single method","pmids":["18218839"],"is_preprint":false},{"year":2011,"finding":"CaV2.3 channels are critical for oscillatory burst discharges in reticular thalamus neurons and for absence epilepsy: in CaV2.3-/- mice, low-threshold spike bursts occur but subsequent oscillatory bursts are severely suppressed, with reduced slow afterhyperpolarization (AHP). Local blockade of CaV2.3 in the RT mimics the knockout phenotype.","method":"CaV2.3 knockout mice, brain slice electrophysiology, local pharmacological block with SNX-482, GBL-induced absence epilepsy model","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout confirmed by pharmacological blockade with two independent approaches and multiple functional readouts; single lab but replicated findings","pmids":["21482359"],"is_preprint":false},{"year":2011,"finding":"Semaphorin 3A (Sema3A) induces axon-to-dendrite identity conversion in Xenopus spinal commissural interneurons by activating CaV2.3 channels: Sema3A triggers cGMP production and PKG activity that respectively induce CaV2.3 expression and dendrite identity acquisition. Inhibition of CaV2.3 results in multiple axon-like neurites.","method":"Cultured Xenopus spinal commissural interneuron experiments, pharmacological inhibition of CaV2.3, siRNA-mediated knockdown, PKG inhibitors, live imaging of neurite identity","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic/pharmacological manipulation of CaV2.3 with defined pathway (cGMP/PKG upstream), functional readout (neurite identity); multiple orthogonal approaches in single study","pmids":["21602796"],"is_preprint":false},{"year":2012,"finding":"A quartet of leucine residues (L200, L303, L337, L342) in the guanylate kinase (GK) domain of CaVβ3 forms a hydrophobic pocket that determines CaV2.3 plasma membrane density: the quadruple mutant L200G/L303G/L337G/L342G nearly abolishes CaV2.3 cell surface density.","method":"Site-directed mutagenesis of CaVβ3 GK domain, surface biotinylation, whole-cell electrophysiology in heterologous expression system","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — systematic mutagenesis combined with surface expression quantification and functional electrophysiology; single lab with multiple orthogonal methods","pmids":["22846999"],"is_preprint":false},{"year":2014,"finding":"GM1 ganglioside and sterol efflux regulate acrosome exocytosis (AE) in sperm through CaV2.3 (α1E subunit): sperm lacking CaV2.3 show altered Ca2+ responses and reduced AE. AE depends on spatiotemporal information encoded by CaV2.3 flux. The GM1/CaV2.3 regulatory interaction requires GM1's lipid and sugar components and CaV2.3's α1E and α2δ subunits (defined by voltage clamp in Xenopus oocytes).","method":"CaV2.3 knockout mice, sperm Ca2+ imaging, acrosome exocytosis assays, Xenopus oocyte voltage clamp, lipid manipulation experiments","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (KO mice, Ca2+ imaging, voltage clamp, lipid manipulation) in single study; identifies molecular requirements for lipid-channel interaction","pmids":["24525187"],"is_preprint":false},{"year":2014,"finding":"GABABR-mediated inhibition of CaV2.3 by cyclized Vc1.1 (c-Vc1.1) requires tyrosines 1761 and 1765 within exon 37 of the CaV2.3 C-terminus and is dependent on c-Src kinase phosphorylation at these sites. The inhibition is voltage-independent and pertussis toxin-sensitive, while baclofen inhibits CaV2.3 (~40%) via voltage-independent pathways. Overexpression of c-Src increases Vc1.1 inhibition; catalytically inactive c-Src abolishes it.","method":"Site-directed mutagenesis of CaV2.3 (Y1761, Y1765), heterologous expression in HEK cells, whole-cell patch-clamp, c-Src overexpression/dominant-negative, pertussis toxin, GABABR antagonist CGP55845","journal":"The Journal of general physiology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis of specific phosphorylation sites combined with kinase overexpression/inhibition and electrophysiology; single lab with multiple orthogonal approaches","pmids":["24688019"],"is_preprint":false},{"year":2006,"finding":"NK1 receptors modulate CaV2.3 through three distinct mechanisms: fast Gβγ-mediated inhibition, slow Gαq/11-mediated inhibition, and slow PKC-mediated stimulation. NK1 receptor activation also accelerates CaV2.3 inactivation kinetics. These pathways are dissectable by buffering Gβγ (transducin, GRK C-terminus) or Gαq/11 (RGS3T, PLCβ1 C-terminus).","method":"Heterologous expression in HEK 293 cells, whole-cell patch-clamp, co-expression of Gβγ/Gαq buffers, PKC inhibitor pharmacology","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple dominant-negative buffering constructs combined with pharmacology and functional electrophysiology dissecting three independent pathways; single lab","pmids":["17050807"],"is_preprint":false},{"year":2019,"finding":"CaV2.3 channels contribute to dopaminergic neuron loss in Parkinson's disease: CaV2.3 is more abundantly expressed in substantia nigra than ventral tegmental area neurons, its transcript is upregulated during aging, and CaV2.3 knockout provides full protection from degeneration in a neurotoxin PD mouse model. CaV2.3 deficiency reduces activity-associated somatic Ca2+ signals and Ca2+-dependent afterhyperpolarizations. CaV2.3 and NCS-1 show reciprocal regulation (Cav2.3 KO upregulates NCS-1; NCS-1 KO downregulates CaV2.3 and exacerbates neurodegeneration).","method":"CaV2.3 knockout mice, neurotoxin PD model (in vivo), somatic Ca2+ imaging, patch-clamp recordings, NCS-1 knockout mice, iPSC model of familial PD, quantitative PCR, Western blot","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with full neuroprotection phenotype confirmed by multiple orthogonal methods (Ca2+ imaging, electrophysiology, NCS-1 reciprocal KO, human iPSC model)","pmids":["31704946"],"is_preprint":false},{"year":2019,"finding":"FMRP binds the mRNA of CaV2.3 in mouse brain synaptoneurosomes and represses CaV2.3 translation under basal conditions. In FMRP KO hippocampal neurons, CaV2.3 protein is enhanced and R-type currents are abnormally large. Group I mGluR stimulation triggers CaV2.3 translation in an FMRP-dependent manner.","method":"Synaptoneurosomes mRNA binding (FMRP-CaV2.3 mRNA interaction), Western blot of CaV2.3 protein in FMRP KO neurons, whole-cell voltage-clamp of R-type currents, mGluR pharmacology","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — FMRP-mRNA binding demonstrated alongside protein expression and functional current changes in KO; multiple orthogonal methods in single study","pmids":["31350260"],"is_preprint":false},{"year":2021,"finding":"KCTD8 and KCTD12b (auxiliary GABABR subunits) directly bind to CaV2.3 in heterologous cells. KCTD8 potentiates CaV2.3 currents independent of GABABR activation. In rostral IPN, KCTD8, KCTD12b, and CaV2.3 co-localize at presynaptic active zones. Genetic deletion indicates bidirectional modulation of CaV2.3-mediated release by these KCTDs.","method":"Co-immunoprecipitation in heterologous cells, patch-clamp electrophysiology, immunofluorescence co-localization at presynaptic active zones, KCTD knockout mice","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct binding shown by Co-IP with functional electrophysiology and in vivo knockout phenotype; multiple orthogonal methods in single study","pmids":["33913808"],"is_preprint":false},{"year":2021,"finding":"Contulakin-G (CGX) produces spinal antinociception via a neurotensin receptor 2 (NTSR2)/CaV2.3 pathway: CRISPR/Cas9 editing and pharmacological block of NTSR2 reversed CGX antinociception, and electrophysiological and gene editing approaches showed CGX inhibition is dependent on CaV2.3 in sensory neurons. NTSR2 and CaV2.3 co-express in DRG neurons with predominantly presynaptic localization.","method":"CRISPR/Cas9 editing of NTSR2, intrathecal CGX delivery, electrophysiology of DRG neurons, synaptic fractionation, spinal cord slice electrophysiology, co-localization by anatomical studies","journal":"Pain","confidence":"High","confidence_rationale":"Tier 2 / Moderate — CRISPR gene editing combined with electrophysiology and synaptic fractionation; multiple orthogonal approaches in single study","pmids":["35050960"],"is_preprint":false},{"year":2022,"finding":"β2a and β2e membrane-anchored splice variants of the β2 subunit stabilize CaV2.3 gating properties during simulated pacemaking, allowing sustained CaV2.3 availability and enhanced Ca2+ currents during bursts. β2a and β2e transcripts are expressed in mouse SN and identified SN dopaminergic neurons, and SNX-482-sensitive R-type currents in these neurons show voltage-dependent gating properties consistent with β2a/β2e modulation.","method":"tsA-201 cell expression with β2 splice variants, patch-clamp recordings during simulated pacemaking, patch-clamp of mouse DA midbrain neurons and SN brain slices, SNX-482 pharmacology, RT-PCR","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — reconstituted channel with specific β2 splice variants in heterologous system, confirmed in native neurons with pharmacology; single lab with multiple orthogonal approaches","pmids":["35792082"],"is_preprint":false},{"year":2023,"finding":"CDKL5 kinase phosphorylates CaV2.3 as a physiological substrate in mice and humans (identified by SILAC-based phosphoproteomics). Loss of CaV2.3 phosphorylation (phosphomutant mice) leads to channel gain-of-function via slower inactivation and enhanced cholinergic stimulation, resulting in increased neuronal excitability. This links CDKL5 deficiency disorder (CDD/DEE2) and CACNA1E gain-of-function DEE69 as mechanistically related channelopathies.","method":"SILAC-based phosphoproteomic screen for CDKL5 substrates, recombinant channel electrophysiology, Cav2.3 phosphomutant knock-in mice characterization, neuronal excitability measurements","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — phosphoproteomic identification of phosphorylation site confirmed by recombinant channel electrophysiology and phosphomutant knock-in mice; multiple orthogonal methods","pmids":["38081835"],"is_preprint":false},{"year":2004,"finding":"CaV2.3 (α1E) is present in embryonic mouse heart and is required for regular cardiac rhythmicity in prenatal hearts: CaV2.3-deficient embryonic hearts show >4-fold increased coefficient of variation in beating frequency (arrhythmia) compared to controls. SNX-482 (R-type blocker) induces arrhythmia in wild-type hearts, confirming that CaV2.3-containing channels stabilize regular prenatal heartbeat.","method":"Multielectrode array recordings of isolated embryonic hearts from CaV2.3-/- and wild-type mice (E9.5–E12.5), SNX-482 pharmacology","journal":"Cellular physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout confirmed by pharmacological blockade in embryonic heart preparation; two independent approaches but single lab","pmids":["14976402"],"is_preprint":false},{"year":2017,"finding":"miR-34c-5p negatively regulates CaV2.3 expression in dorsal root ganglion neurons: canonical and reciprocal regulation of miR-34c-5p and Cav2.3 was observed in cultured sensory neurons and in vivo in cancer pain models, and luciferase reporter assays confirmed functional binding of miR-34c-5p to the 3' UTR of Cav2.3 transcripts. Knockdown of Cav2.3 in DRG neurons causes hypersensitivity, indicating an antinociceptive role in peripheral sensory neurons.","method":"Luciferase 3'UTR reporter assay, in vivo DRG-specific Cav2.3 knockdown, cancer pain mouse model, cultured DRG neurons","journal":"Pain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — luciferase reporter validation combined with in vivo knockdown and functional pain phenotype; single lab with orthogonal methods","pmids":["28614186"],"is_preprint":false}],"current_model":"CaV2.3 (encoded by CACNA1E) is a high-voltage-activated R-type calcium channel whose pore-forming α1E subunit is modulated by auxiliary β and α2δ subunits through specific interactions in the I-II linker AID helix (anchored by Ile14 and Trp13) and the β GK domain (hydrophobic leucine quartet); its inactivation kinetics are governed by residue R378 in the AID and hydrophobic residues in S6 transmembrane segments; the cytosolic II-III loop mediates PKC-dependent stimulation (via an arginine-rich motif) and hsp70 interaction; it is phosphorylated by CDKL5 kinase, which slows inactivation and controls neuronal excitability; it is modulated by GABABR via Gβγ (inhibition), Gαq/11 (inhibition), and PKC (stimulation), and by Gαq/11-coupled receptors including muscarinic and NK1 receptors; it is translationally repressed by FMRP under basal conditions with GpI mGluR-dependent derepression; its plasma membrane density is regulated by the β2a/β2e splice variants; and it plays defined physiological roles in second-phase insulin secretion, reticular thalamic oscillatory burst discharge, dopaminergic neuron survival, sperm acrosome exocytosis, axon-to-dendrite identity conversion, prenatal cardiac rhythmicity, and nociception."},"narrative":{"mechanistic_narrative":"CACNA1E encodes the pore-forming α1E subunit of CaV2.3, a high-voltage-activated R-type calcium channel that couples membrane depolarization to Ca2+ entry across neuronal, endocrine, cardiac, and germ-cell membranes, defined pharmacologically by relative dihydropyridine/ω-toxin resistance and partial Ni2+ and SNX-482 sensitivity [PMID:7719708]. Channel gating is set by discrete structural determinants: residue R378 in the I-II linker AID controls voltage-dependent inactivation [PMID:11159396], hydrophobic residues of the S6 segments (the IVS6 VAVIM motif and equivalent positions) stabilize the closed state [PMID:17660294], and the AID anchor residues Trp13/Ile14 dock the auxiliary CaVβ subunit through a hydrophobic leucine quartet in the β GK domain that governs plasma-membrane density [PMID:15507442, PMID:22846999], with membrane-anchored β2a/β2e splice variants sustaining channel availability during repetitive firing [PMID:35792082]. The cytosolic II-III loop integrates G-protein and kinase signaling: an arginine-rich motif mediates PKC-dependent stimulation and recruits hsp70 [PMID:15147300, PMID:16543726], while Gαq/11-coupled muscarinic and NK1 receptors drive PKC stimulation alongside Gβγ- and Gαq/11-mediated inhibition [PMID:14742680, PMID:17050807]. The channel is further regulated by CDKL5 phosphorylation, which slows inactivation and tunes excitability [PMID:38081835], by GABAB-receptor/c-Src signaling at C-terminal tyrosines Y1761/Y1765 and by KCTD8/KCTD12b auxiliary subunits at presynaptic active zones [PMID:24688019, PMID:33913808], and by FMRP-mediated translational repression that is relieved by group I mGluR activation [PMID:31350260]. Physiologically, CaV2.3 controls second-phase insulin secretion [PMID:15630454], reticular-thalamic oscillatory bursting and seizure/excitotoxicity susceptibility [PMID:17376845, PMID:21482359], dopaminergic neuron vulnerability in Parkinson models [PMID:31704946], sperm acrosome exocytosis [PMID:24525187], prenatal cardiac rhythmicity [PMID:14976402], axon-to-dendrite identity conversion [PMID:21602796], and nociception [PMID:35050960, PMID:28614186]. CDKL5 substrate work mechanistically links CACNA1E gain-of-function developmental epileptic encephalopathy (DEE69) to CDKL5 deficiency disorder [PMID:38081835].","teleology":[{"year":1994,"claim":"Establishing that α1E forms a distinct high-voltage-activated channel with a unique pharmacological and Ni2+-sensitivity signature defined CaV2.3 as a separate channel class and showed auxiliary subunits reshape its kinetics.","evidence":"Cloned cDNA expressed in Xenopus oocytes with whole-cell electrophysiology, pharmacological profiling, and β/α2 co-expression","pmids":["7719708"],"confidence":"High","gaps":["Native channel identity in tissue not yet addressed","Structural basis of subunit modulation undefined"]},{"year":2001,"claim":"Identifying R378 in the AID as a determinant of voltage-dependent inactivation localized inactivation gating to the I-II linker.","evidence":"Site-directed mutagenesis and whole-cell patch-clamp in Xenopus oocytes","pmids":["11159396"],"confidence":"High","gaps":["Does not resolve full conformational pathway of inactivation","Interaction with S6 gating elements not established here"]},{"year":2004,"claim":"Mapping the CaVβ anchor to Trp13/Ile14 of the AID and the II-III loop arginine-rich motif to PKC stimulation defined the structural interfaces for auxiliary modulation and kinase regulation.","evidence":"Alanine/site-directed mutagenesis, CaVβ overlay binding, PKC inhibitor pharmacology, and electrophysiology in HEK cells with homology modeling","pmids":["15507442","15147300","14742680"],"confidence":"High","gaps":["Endogenous PKC isoform specificity in neurons not resolved","In vivo relevance of these interfaces untested"]},{"year":2004,"claim":"Demonstrating CaV2.3 requirement for regular prenatal heartbeat extended its role beyond neurons to embryonic cardiac pacemaking.","evidence":"Multielectrode array recordings of embryonic CaV2.3-/- and WT hearts with SNX-482 pharmacology","pmids":["14976402"],"confidence":"Medium","gaps":["Cellular mechanism linking CaV2.3 to rhythm stabilization unclear","Single lab, embryonic stage only"]},{"year":2005,"claim":"Genetic and pharmacological ablation tied CaV2.3 specifically to second-phase insulin secretion, assigning it a defined endocrine function.","evidence":"CaV2.3 knockout mice, dynamic insulin assays, SNX-482, beta-cell Ca2+ imaging and capacitance measurements","pmids":["15630454"],"confidence":"High","gaps":["Molecular coupling to granule recruitment not fully defined","Human beta-cell relevance not tested"]},{"year":2006,"claim":"Identifying hsp70 binding to the II-III loop and dissecting NK1-receptor tripartite modulation clarified how scaffold and G-protein signaling converge on the cytosolic loop.","evidence":"FLAG-tagged loop immunopurification with PKC autophosphorylation assay; Gβγ/Gαq buffering and pharmacology in HEK cells","pmids":["16543726","17050807"],"confidence":"High","gaps":["hsp70 interaction is a single Co-IP/pulldown without reciprocal in vivo validation","Functional consequence of hsp70 binding on channel gating untested"]},{"year":2007,"claim":"S6 hydrophobic-residue scanning and knockout seizure studies linked channel gating chemistry to closed-state stability and established CaV2.3 in ictogenesis and excitotoxicity.","evidence":"Glycine-scanning mutagenesis with electrophysiology and modeling; CaV2.3 KO mice in kainate/NMDA seizure models with EEG and histology","pmids":["17660294","17376845"],"confidence":"High","gaps":["Cell-type and circuit basis of seizure resistance not delineated","Link between S6 gating and excitotoxic Ca2+ load not directly tested"]},{"year":2011,"claim":"Knockout and slice work placed CaV2.3 at the core of reticular-thalamic oscillatory bursting and absence epilepsy, and a Sema3A/cGMP/PKG pathway showed CaV2.3 drives neurite identity conversion.","evidence":"CaV2.3 KO slice electrophysiology with SNX-482 and GBL absence model; Xenopus interneuron cultures with siRNA, PKG inhibitors, and live imaging","pmids":["21482359","21602796"],"confidence":"High","gaps":["Mechanism linking CaV2.3 to slow AHP not fully resolved","How CaV2.3 instructs dendrite identity downstream undefined"]},{"year":2012,"claim":"Defining the CaVβ3 GK-domain leucine quartet as a determinant of CaV2.3 surface density established a structural basis for trafficking control.","evidence":"GK-domain mutagenesis with surface biotinylation and electrophysiology in heterologous cells","pmids":["22846999"],"confidence":"High","gaps":["Trafficking machinery downstream of β binding unidentified","Relevance in native neurons untested"]},{"year":2014,"claim":"CaV2.3 was shown to drive sperm acrosome exocytosis under GM1/sterol control and to be inhibited via GABABR/c-Src phosphorylation of C-terminal tyrosines Y1761/Y1765, expanding its regulatory and physiological scope.","evidence":"KO mice, sperm Ca2+ imaging and AE assays, oocyte voltage clamp, lipid manipulation; tyrosine mutagenesis with c-Src manipulation and pertussis toxin in HEK cells","pmids":["24525187","24688019"],"confidence":"High","gaps":["Direct molecular contact of GM1 with channel not resolved","In vivo neuronal role of GABABR/c-Src pathway untested"]},{"year":2017,"claim":"Identifying miR-34c-5p as a 3'UTR-targeting repressor of CaV2.3 in DRG neurons added post-transcriptional control and an antinociceptive role in peripheral sensory neurons.","evidence":"Luciferase 3'UTR reporter, in vivo DRG knockdown, cancer pain model, cultured DRG neurons","pmids":["28614186"],"confidence":"Medium","gaps":["Single lab; direct endogenous miRNA-target occupancy not shown","Mechanism of channel-dependent hypersensitivity unresolved"]},{"year":2019,"claim":"Knockout neuroprotection and reciprocal NCS-1 regulation implicated CaV2.3 in dopaminergic neuron vulnerability, and FMRP binding/repression of CaV2.3 mRNA tied the channel to translational control relieved by group I mGluRs.","evidence":"CaV2.3 and NCS-1 KO mice, neurotoxin PD model, Ca2+ imaging, iPSC model; FMRP-mRNA binding in synaptoneurosomes, KO Western blot, R-type current recordings with mGluR pharmacology","pmids":["31704946","31350260"],"confidence":"High","gaps":["Causal chain from Ca2+ load to degeneration not fully resolved","FMRP regulatory site on CaV2.3 mRNA not mapped"]},{"year":2021,"claim":"KCTD8/KCTD12b were identified as direct CaV2.3 binders at presynaptic active zones, and a NTSR2/CaV2.3 axis was shown to mediate contulakin-G spinal antinociception, defining presynaptic regulatory partners and an analgesic pathway.","evidence":"Co-IP, electrophysiology, active-zone co-localization, KCTD KO mice; CRISPR/Cas9 NTSR2 editing, DRG and spinal cord electrophysiology, synaptic fractionation","pmids":["33913808","35050960"],"confidence":"High","gaps":["Structural basis of KCTD-CaV2.3 binding undefined","Direct vs indirect NTSR2-CaV2.3 coupling not fully resolved"]},{"year":2022,"claim":"Demonstrating that β2a/β2e splice variants stabilize CaV2.3 gating during pacemaking explained how the channel sustains current in repetitively firing dopaminergic neurons.","evidence":"tsA-201 expression with β2 splice variants, simulated-pacemaking patch-clamp, native SN neuron recordings with SNX-482, RT-PCR","pmids":["35792082"],"confidence":"High","gaps":["Quantitative contribution of each β2 variant in vivo unclear","Link to degeneration phenotype not directly tested"]},{"year":2023,"claim":"Identifying CaV2.3 as a CDKL5 phosphorylation substrate whose dephosphorylation produces channel gain-of-function mechanistically connected CDKL5 deficiency disorder and CACNA1E gain-of-function epileptic encephalopathy.","evidence":"SILAC phosphoproteomics, recombinant channel electrophysiology, phosphomutant knock-in mice with excitability measurements","pmids":["38081835"],"confidence":"High","gaps":["Precise phosphosite consequences on gating structure not resolved","Therapeutic implications untested"]},{"year":null,"claim":"How the many regulatory inputs (kinases, G-proteins, auxiliary subunits, RNA-binding/miRNA control) are integrated to set CaV2.3 function in each native cell type, and the structural basis of pathogenic gain-of-function, remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No high-resolution structure of full CaV2.3 complex in the corpus","Cell-type-specific combinatorial regulation not mapped","Mechanistic basis of DEE69 mutations beyond CDKL5 link undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,5,10]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,1,7]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[12,18,20]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,6]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[10,8,17]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,15,14]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[5,13]}],"complexes":[],"partners":["CACNB3","CDKL5","FMR1","KCTD8","KCTD12B","HSPA8","NCS1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q15878","full_name":"Voltage-dependent R-type calcium channel subunit alpha-1E","aliases":["Brain calcium channel II","BII","Calcium channel, L type, alpha-1 polypeptide, isoform 6","Voltage-gated calcium channel subunit alpha Cav2.3"],"length_aa":2313,"mass_kda":261.7,"function":"Voltage-sensitive calcium channels (VSCC) mediate the entry of calcium ions into excitable cells (PubMed:30343943). 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It is insensitive to dihydropyridines, ω-CgTx-GVIA, and ω-Aga-IVA. Coexpression with the β subunit decelerates both activation and inactivation rates (opposite to L-type), and further coexpression of α2 subunit cancels this β effect.\",\n      \"method\": \"Xenopus oocyte expression, whole-cell electrophysiology, pharmacological profiling, auxiliary subunit co-expression\",\n      \"journal\": \"Receptors & channels\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted channel from cloned cDNA in oocyte system with pharmacological and subunit co-expression analysis; single lab but multiple orthogonal electrophysiology approaches\",\n      \"pmids\": [\"7719708\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Voltage-dependent inactivation of CaV2.3 is controlled by position R378 (position 5 of the AID motif) in the I-II linker: substitution with negatively charged residues (Glu or Asp) slows inactivation kinetics and shifts voltage dependence of inactivation to more positive voltages, while positively charged residues promote inactivation. This residue plays a significant role in inactivation gating.\",\n      \"method\": \"Site-directed mutagenesis, whole-cell patch-clamp electrophysiology in Xenopus oocytes\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — systematic mutagenesis of multiple residues combined with functional electrophysiology; single lab but multiple mutations tested with consistent results\",\n      \"pmids\": [\"11159396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PKC-mediated stimulation of CaV2.3 requires an arginine-rich region in the cytosolic II-III loop: phorbol ester activation of PKC augments CaV2.3 Ba2+ currents (~60%) and increases non-inactivating fraction (~3-fold), but this modulation is abolished when the arginine-rich region of the II-III loop is eliminated. This represents a positive feedback mechanism linking Ca2+ influx through other channels to CaV2.3 activation via PKC.\",\n      \"method\": \"Site-directed mutagenesis of II-III loop, whole-cell patch-clamp in HEK-293 cells, PKC inhibitor pharmacology\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with functional electrophysiology and pharmacological inhibition in heterologous expression system; identifies a specific molecular determinant\",\n      \"pmids\": [\"15147300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The C-terminal residues Trp13 and Ile14 of the AID helix in the I-II linker of CaV2.3 anchor CaVβ subunit functional modulation: Ile14 mutations to charged residues (Asp, Glu, Arg, Lys) abolish CaVβ3 binding and modulation, while I14L preserves modulation. A hydrophobic pocket at position 14 accounts for the strict structural specificity of the CaVβ interaction.\",\n      \"method\": \"Alanine-scanning and site-directed mutagenesis, [35S]CaVβ overlay binding assay, whole-cell electrophysiology in HEK cells, 3D homology modeling\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple mutagenesis combined with binding assay and functional electrophysiology; single lab with orthogonal methods\",\n      \"pmids\": [\"15507442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Muscarinic M1, M3, and M5 receptors (Gαq/11-coupled) stimulate CaV2.3 through a pathway involving Gαq/11, diacylglycerol, and a Ca2+-independent PKC (specifically blocked by neutralizing anti-Gαq/11 antibodies, PKCδ regulatory domain, phorbol ester pre-activation, or bisindolylmaleimide I). Muscarinic inhibition of CaV2.3 is mediated by Gβγ subunits, and PKC-mediated stimulation cross-talks with Gβγ-mediated inhibition.\",\n      \"method\": \"Heterologous expression in HEK cells, whole-cell patch-clamp, pharmacological inhibitors, neutralizing antibodies, co-expression of signaling pathway components\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple pharmacological approaches and co-expression of dominant-negative constructs in a single rigorous study; single lab\",\n      \"pmids\": [\"14742680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CaV2.3 channels specifically control second-phase insulin release from pancreatic beta cells: CaV2.3 knockout or pharmacological block with SNX-482 suppresses second-phase secretion while leaving first-phase unaffected. CaV2.3 ablation also reduces oscillatory Ca2+ signaling and granule recruitment after the initial exocytotic burst.\",\n      \"method\": \"CaV2.3 knockout mice, dynamic insulin release measurements, pharmacological block with SNX-482, single beta cell Ca2+ imaging, capacitance measurements\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout combined with pharmacological blockade and multiple functional readouts; replicated with two independent approaches (KO and SNX-482)\",\n      \"pmids\": [\"15630454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The molecular chaperone hsp70 interacts with the cytosolic II-III loop of CaV2.3 and may act as an adaptor for Ca2+-dependent targeting of PKC to E-type channels. Immunopurified II-III loop protein stimulates PKCα autophosphorylation.\",\n      \"method\": \"FLAG-tagged II-III loop overexpression in HEK 293 cells, immunopurification, identification of hsp70 as interaction partner, PKC autophosphorylation assay\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP/pulldown approach identifying hsp70 interaction; single lab, limited functional follow-up\",\n      \"pmids\": [\"16543726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Hydrophobic residues in the IVS6 transmembrane segment of CaV2.3 (specifically the VAVIM motif) control the relative stability of the channel closed and open states: glycine substitutions at positions equivalent to Val1720 (in IS6, IIS6, IIIS6, and IVS6) produce slow inactivating currents with hyperpolarizing activation shifts, indicating that hydrophobic residues at these positions promote the channel closed state.\",\n      \"method\": \"Glycine-scanning mutagenesis of IVS6 (and equivalent positions in IS6, IIS6, IIIS6), whole-cell patch-clamp in heterologous expression, 3D homology modeling based on Kv1.2\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — systematic mutagenesis of multiple positions combined with functional electrophysiology and structural modeling; single lab but extensive mutant series\",\n      \"pmids\": [\"17660294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CaV2.3 channels play a critical role in hippocampal ictogenesis and neuronal degeneration after excitotoxic events: CaV2.3-deficient mice show dramatic resistance to kainic acid-induced limbic seizures and absence of excitotoxic cell death in hippocampus after kainate, while wild-type mice exhibit clear excitotoxic neurodegeneration.\",\n      \"method\": \"CaV2.3 knockout mice, kainic acid and NMDA seizure models, surface and deep telemetric EEG recordings, histochemical analysis of hippocampal excitotoxicity\",\n      \"journal\": \"Journal of neurophysiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with multiple functional readouts (behavioral, EEG, histological); single lab\",\n      \"pmids\": [\"17376845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Eugenol inhibits CaV2.3 calcium channel currents in a TRPV1-independent manner, demonstrating a distinct mechanism from capsaicin (which requires TRPV1 for CaV2.3 inhibition).\",\n      \"method\": \"Whole-cell patch-clamp in E52 cell line stably expressing human CaV2.3, comparison between TRPV1-expressing and naïve cells\",\n      \"journal\": \"Journal of dental research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean pharmacological experiment in stable cell line distinguishing mechanism from capsaicin; single lab, single method\",\n      \"pmids\": [\"18218839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CaV2.3 channels are critical for oscillatory burst discharges in reticular thalamus neurons and for absence epilepsy: in CaV2.3-/- mice, low-threshold spike bursts occur but subsequent oscillatory bursts are severely suppressed, with reduced slow afterhyperpolarization (AHP). Local blockade of CaV2.3 in the RT mimics the knockout phenotype.\",\n      \"method\": \"CaV2.3 knockout mice, brain slice electrophysiology, local pharmacological block with SNX-482, GBL-induced absence epilepsy model\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout confirmed by pharmacological blockade with two independent approaches and multiple functional readouts; single lab but replicated findings\",\n      \"pmids\": [\"21482359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Semaphorin 3A (Sema3A) induces axon-to-dendrite identity conversion in Xenopus spinal commissural interneurons by activating CaV2.3 channels: Sema3A triggers cGMP production and PKG activity that respectively induce CaV2.3 expression and dendrite identity acquisition. Inhibition of CaV2.3 results in multiple axon-like neurites.\",\n      \"method\": \"Cultured Xenopus spinal commissural interneuron experiments, pharmacological inhibition of CaV2.3, siRNA-mediated knockdown, PKG inhibitors, live imaging of neurite identity\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic/pharmacological manipulation of CaV2.3 with defined pathway (cGMP/PKG upstream), functional readout (neurite identity); multiple orthogonal approaches in single study\",\n      \"pmids\": [\"21602796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"A quartet of leucine residues (L200, L303, L337, L342) in the guanylate kinase (GK) domain of CaVβ3 forms a hydrophobic pocket that determines CaV2.3 plasma membrane density: the quadruple mutant L200G/L303G/L337G/L342G nearly abolishes CaV2.3 cell surface density.\",\n      \"method\": \"Site-directed mutagenesis of CaVβ3 GK domain, surface biotinylation, whole-cell electrophysiology in heterologous expression system\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — systematic mutagenesis combined with surface expression quantification and functional electrophysiology; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"22846999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"GM1 ganglioside and sterol efflux regulate acrosome exocytosis (AE) in sperm through CaV2.3 (α1E subunit): sperm lacking CaV2.3 show altered Ca2+ responses and reduced AE. AE depends on spatiotemporal information encoded by CaV2.3 flux. The GM1/CaV2.3 regulatory interaction requires GM1's lipid and sugar components and CaV2.3's α1E and α2δ subunits (defined by voltage clamp in Xenopus oocytes).\",\n      \"method\": \"CaV2.3 knockout mice, sperm Ca2+ imaging, acrosome exocytosis assays, Xenopus oocyte voltage clamp, lipid manipulation experiments\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (KO mice, Ca2+ imaging, voltage clamp, lipid manipulation) in single study; identifies molecular requirements for lipid-channel interaction\",\n      \"pmids\": [\"24525187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"GABABR-mediated inhibition of CaV2.3 by cyclized Vc1.1 (c-Vc1.1) requires tyrosines 1761 and 1765 within exon 37 of the CaV2.3 C-terminus and is dependent on c-Src kinase phosphorylation at these sites. The inhibition is voltage-independent and pertussis toxin-sensitive, while baclofen inhibits CaV2.3 (~40%) via voltage-independent pathways. Overexpression of c-Src increases Vc1.1 inhibition; catalytically inactive c-Src abolishes it.\",\n      \"method\": \"Site-directed mutagenesis of CaV2.3 (Y1761, Y1765), heterologous expression in HEK cells, whole-cell patch-clamp, c-Src overexpression/dominant-negative, pertussis toxin, GABABR antagonist CGP55845\",\n      \"journal\": \"The Journal of general physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of specific phosphorylation sites combined with kinase overexpression/inhibition and electrophysiology; single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"24688019\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NK1 receptors modulate CaV2.3 through three distinct mechanisms: fast Gβγ-mediated inhibition, slow Gαq/11-mediated inhibition, and slow PKC-mediated stimulation. NK1 receptor activation also accelerates CaV2.3 inactivation kinetics. These pathways are dissectable by buffering Gβγ (transducin, GRK C-terminus) or Gαq/11 (RGS3T, PLCβ1 C-terminus).\",\n      \"method\": \"Heterologous expression in HEK 293 cells, whole-cell patch-clamp, co-expression of Gβγ/Gαq buffers, PKC inhibitor pharmacology\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple dominant-negative buffering constructs combined with pharmacology and functional electrophysiology dissecting three independent pathways; single lab\",\n      \"pmids\": [\"17050807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CaV2.3 channels contribute to dopaminergic neuron loss in Parkinson's disease: CaV2.3 is more abundantly expressed in substantia nigra than ventral tegmental area neurons, its transcript is upregulated during aging, and CaV2.3 knockout provides full protection from degeneration in a neurotoxin PD mouse model. CaV2.3 deficiency reduces activity-associated somatic Ca2+ signals and Ca2+-dependent afterhyperpolarizations. CaV2.3 and NCS-1 show reciprocal regulation (Cav2.3 KO upregulates NCS-1; NCS-1 KO downregulates CaV2.3 and exacerbates neurodegeneration).\",\n      \"method\": \"CaV2.3 knockout mice, neurotoxin PD model (in vivo), somatic Ca2+ imaging, patch-clamp recordings, NCS-1 knockout mice, iPSC model of familial PD, quantitative PCR, Western blot\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with full neuroprotection phenotype confirmed by multiple orthogonal methods (Ca2+ imaging, electrophysiology, NCS-1 reciprocal KO, human iPSC model)\",\n      \"pmids\": [\"31704946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"FMRP binds the mRNA of CaV2.3 in mouse brain synaptoneurosomes and represses CaV2.3 translation under basal conditions. In FMRP KO hippocampal neurons, CaV2.3 protein is enhanced and R-type currents are abnormally large. Group I mGluR stimulation triggers CaV2.3 translation in an FMRP-dependent manner.\",\n      \"method\": \"Synaptoneurosomes mRNA binding (FMRP-CaV2.3 mRNA interaction), Western blot of CaV2.3 protein in FMRP KO neurons, whole-cell voltage-clamp of R-type currents, mGluR pharmacology\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FMRP-mRNA binding demonstrated alongside protein expression and functional current changes in KO; multiple orthogonal methods in single study\",\n      \"pmids\": [\"31350260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"KCTD8 and KCTD12b (auxiliary GABABR subunits) directly bind to CaV2.3 in heterologous cells. KCTD8 potentiates CaV2.3 currents independent of GABABR activation. In rostral IPN, KCTD8, KCTD12b, and CaV2.3 co-localize at presynaptic active zones. Genetic deletion indicates bidirectional modulation of CaV2.3-mediated release by these KCTDs.\",\n      \"method\": \"Co-immunoprecipitation in heterologous cells, patch-clamp electrophysiology, immunofluorescence co-localization at presynaptic active zones, KCTD knockout mice\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding shown by Co-IP with functional electrophysiology and in vivo knockout phenotype; multiple orthogonal methods in single study\",\n      \"pmids\": [\"33913808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Contulakin-G (CGX) produces spinal antinociception via a neurotensin receptor 2 (NTSR2)/CaV2.3 pathway: CRISPR/Cas9 editing and pharmacological block of NTSR2 reversed CGX antinociception, and electrophysiological and gene editing approaches showed CGX inhibition is dependent on CaV2.3 in sensory neurons. NTSR2 and CaV2.3 co-express in DRG neurons with predominantly presynaptic localization.\",\n      \"method\": \"CRISPR/Cas9 editing of NTSR2, intrathecal CGX delivery, electrophysiology of DRG neurons, synaptic fractionation, spinal cord slice electrophysiology, co-localization by anatomical studies\",\n      \"journal\": \"Pain\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR gene editing combined with electrophysiology and synaptic fractionation; multiple orthogonal approaches in single study\",\n      \"pmids\": [\"35050960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"β2a and β2e membrane-anchored splice variants of the β2 subunit stabilize CaV2.3 gating properties during simulated pacemaking, allowing sustained CaV2.3 availability and enhanced Ca2+ currents during bursts. β2a and β2e transcripts are expressed in mouse SN and identified SN dopaminergic neurons, and SNX-482-sensitive R-type currents in these neurons show voltage-dependent gating properties consistent with β2a/β2e modulation.\",\n      \"method\": \"tsA-201 cell expression with β2 splice variants, patch-clamp recordings during simulated pacemaking, patch-clamp of mouse DA midbrain neurons and SN brain slices, SNX-482 pharmacology, RT-PCR\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — reconstituted channel with specific β2 splice variants in heterologous system, confirmed in native neurons with pharmacology; single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"35792082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CDKL5 kinase phosphorylates CaV2.3 as a physiological substrate in mice and humans (identified by SILAC-based phosphoproteomics). Loss of CaV2.3 phosphorylation (phosphomutant mice) leads to channel gain-of-function via slower inactivation and enhanced cholinergic stimulation, resulting in increased neuronal excitability. This links CDKL5 deficiency disorder (CDD/DEE2) and CACNA1E gain-of-function DEE69 as mechanistically related channelopathies.\",\n      \"method\": \"SILAC-based phosphoproteomic screen for CDKL5 substrates, recombinant channel electrophysiology, Cav2.3 phosphomutant knock-in mice characterization, neuronal excitability measurements\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — phosphoproteomic identification of phosphorylation site confirmed by recombinant channel electrophysiology and phosphomutant knock-in mice; multiple orthogonal methods\",\n      \"pmids\": [\"38081835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CaV2.3 (α1E) is present in embryonic mouse heart and is required for regular cardiac rhythmicity in prenatal hearts: CaV2.3-deficient embryonic hearts show >4-fold increased coefficient of variation in beating frequency (arrhythmia) compared to controls. SNX-482 (R-type blocker) induces arrhythmia in wild-type hearts, confirming that CaV2.3-containing channels stabilize regular prenatal heartbeat.\",\n      \"method\": \"Multielectrode array recordings of isolated embryonic hearts from CaV2.3-/- and wild-type mice (E9.5–E12.5), SNX-482 pharmacology\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout confirmed by pharmacological blockade in embryonic heart preparation; two independent approaches but single lab\",\n      \"pmids\": [\"14976402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"miR-34c-5p negatively regulates CaV2.3 expression in dorsal root ganglion neurons: canonical and reciprocal regulation of miR-34c-5p and Cav2.3 was observed in cultured sensory neurons and in vivo in cancer pain models, and luciferase reporter assays confirmed functional binding of miR-34c-5p to the 3' UTR of Cav2.3 transcripts. Knockdown of Cav2.3 in DRG neurons causes hypersensitivity, indicating an antinociceptive role in peripheral sensory neurons.\",\n      \"method\": \"Luciferase 3'UTR reporter assay, in vivo DRG-specific Cav2.3 knockdown, cancer pain mouse model, cultured DRG neurons\",\n      \"journal\": \"Pain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — luciferase reporter validation combined with in vivo knockdown and functional pain phenotype; single lab with orthogonal methods\",\n      \"pmids\": [\"28614186\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CaV2.3 (encoded by CACNA1E) is a high-voltage-activated R-type calcium channel whose pore-forming α1E subunit is modulated by auxiliary β and α2δ subunits through specific interactions in the I-II linker AID helix (anchored by Ile14 and Trp13) and the β GK domain (hydrophobic leucine quartet); its inactivation kinetics are governed by residue R378 in the AID and hydrophobic residues in S6 transmembrane segments; the cytosolic II-III loop mediates PKC-dependent stimulation (via an arginine-rich motif) and hsp70 interaction; it is phosphorylated by CDKL5 kinase, which slows inactivation and controls neuronal excitability; it is modulated by GABABR via Gβγ (inhibition), Gαq/11 (inhibition), and PKC (stimulation), and by Gαq/11-coupled receptors including muscarinic and NK1 receptors; it is translationally repressed by FMRP under basal conditions with GpI mGluR-dependent derepression; its plasma membrane density is regulated by the β2a/β2e splice variants; and it plays defined physiological roles in second-phase insulin secretion, reticular thalamic oscillatory burst discharge, dopaminergic neuron survival, sperm acrosome exocytosis, axon-to-dendrite identity conversion, prenatal cardiac rhythmicity, and nociception.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CACNA1E encodes the pore-forming \\u03b11E subunit of CaV2.3, a high-voltage-activated R-type calcium channel that couples membrane depolarization to Ca2+ entry across neuronal, endocrine, cardiac, and germ-cell membranes, defined pharmacologically by relative dihydropyridine/\\u03c9-toxin resistance and partial Ni2+ and SNX-482 sensitivity [#0]. Channel gating is set by discrete structural determinants: residue R378 in the I-II linker AID controls voltage-dependent inactivation [#1], hydrophobic residues of the S6 segments (the IVS6 VAVIM motif and equivalent positions) stabilize the closed state [#7], and the AID anchor residues Trp13/Ile14 dock the auxiliary CaV\\u03b2 subunit through a hydrophobic leucine quartet in the \\u03b2 GK domain that governs plasma-membrane density [#3, #12], with membrane-anchored \\u03b22a/\\u03b22e splice variants sustaining channel availability during repetitive firing [#20]. The cytosolic II-III loop integrates G-protein and kinase signaling: an arginine-rich motif mediates PKC-dependent stimulation and recruits hsp70 [#2, #6], while G\\u03b1q/11-coupled muscarinic and NK1 receptors drive PKC stimulation alongside G\\u03b2\\u03b3- and G\\u03b1q/11-mediated inhibition [#4, #15]. The channel is further regulated by CDKL5 phosphorylation, which slows inactivation and tunes excitability [#21], by GABAB-receptor/c-Src signaling at C-terminal tyrosines Y1761/Y1765 and by KCTD8/KCTD12b auxiliary subunits at presynaptic active zones [#14, #18], and by FMRP-mediated translational repression that is relieved by group I mGluR activation [#17]. Physiologically, CaV2.3 controls second-phase insulin secretion [#5], reticular-thalamic oscillatory bursting and seizure/excitotoxicity susceptibility [#8, #10], dopaminergic neuron vulnerability in Parkinson models [#16], sperm acrosome exocytosis [#13], prenatal cardiac rhythmicity [#22], axon-to-dendrite identity conversion [#11], and nociception [#19, #23]. CDKL5 substrate work mechanistically links CACNA1E gain-of-function developmental epileptic encephalopathy (DEE69) to CDKL5 deficiency disorder [#21].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Establishing that \\u03b11E forms a distinct high-voltage-activated channel with a unique pharmacological and Ni2+-sensitivity signature defined CaV2.3 as a separate channel class and showed auxiliary subunits reshape its kinetics.\",\n      \"evidence\": \"Cloned cDNA expressed in Xenopus oocytes with whole-cell electrophysiology, pharmacological profiling, and \\u03b2/\\u03b12 co-expression\",\n      \"pmids\": [\"7719708\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Native channel identity in tissue not yet addressed\", \"Structural basis of subunit modulation undefined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identifying R378 in the AID as a determinant of voltage-dependent inactivation localized inactivation gating to the I-II linker.\",\n      \"evidence\": \"Site-directed mutagenesis and whole-cell patch-clamp in Xenopus oocytes\",\n      \"pmids\": [\"11159396\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not resolve full conformational pathway of inactivation\", \"Interaction with S6 gating elements not established here\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Mapping the CaV\\u03b2 anchor to Trp13/Ile14 of the AID and the II-III loop arginine-rich motif to PKC stimulation defined the structural interfaces for auxiliary modulation and kinase regulation.\",\n      \"evidence\": \"Alanine/site-directed mutagenesis, CaV\\u03b2 overlay binding, PKC inhibitor pharmacology, and electrophysiology in HEK cells with homology modeling\",\n      \"pmids\": [\"15507442\", \"15147300\", \"14742680\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous PKC isoform specificity in neurons not resolved\", \"In vivo relevance of these interfaces untested\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrating CaV2.3 requirement for regular prenatal heartbeat extended its role beyond neurons to embryonic cardiac pacemaking.\",\n      \"evidence\": \"Multielectrode array recordings of embryonic CaV2.3-/- and WT hearts with SNX-482 pharmacology\",\n      \"pmids\": [\"14976402\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cellular mechanism linking CaV2.3 to rhythm stabilization unclear\", \"Single lab, embryonic stage only\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Genetic and pharmacological ablation tied CaV2.3 specifically to second-phase insulin secretion, assigning it a defined endocrine function.\",\n      \"evidence\": \"CaV2.3 knockout mice, dynamic insulin assays, SNX-482, beta-cell Ca2+ imaging and capacitance measurements\",\n      \"pmids\": [\"15630454\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular coupling to granule recruitment not fully defined\", \"Human beta-cell relevance not tested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identifying hsp70 binding to the II-III loop and dissecting NK1-receptor tripartite modulation clarified how scaffold and G-protein signaling converge on the cytosolic loop.\",\n      \"evidence\": \"FLAG-tagged loop immunopurification with PKC autophosphorylation assay; G\\u03b2\\u03b3/G\\u03b1q buffering and pharmacology in HEK cells\",\n      \"pmids\": [\"16543726\", \"17050807\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"hsp70 interaction is a single Co-IP/pulldown without reciprocal in vivo validation\", \"Functional consequence of hsp70 binding on channel gating untested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"S6 hydrophobic-residue scanning and knockout seizure studies linked channel gating chemistry to closed-state stability and established CaV2.3 in ictogenesis and excitotoxicity.\",\n      \"evidence\": \"Glycine-scanning mutagenesis with electrophysiology and modeling; CaV2.3 KO mice in kainate/NMDA seizure models with EEG and histology\",\n      \"pmids\": [\"17660294\", \"17376845\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-type and circuit basis of seizure resistance not delineated\", \"Link between S6 gating and excitotoxic Ca2+ load not directly tested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Knockout and slice work placed CaV2.3 at the core of reticular-thalamic oscillatory bursting and absence epilepsy, and a Sema3A/cGMP/PKG pathway showed CaV2.3 drives neurite identity conversion.\",\n      \"evidence\": \"CaV2.3 KO slice electrophysiology with SNX-482 and GBL absence model; Xenopus interneuron cultures with siRNA, PKG inhibitors, and live imaging\",\n      \"pmids\": [\"21482359\", \"21602796\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking CaV2.3 to slow AHP not fully resolved\", \"How CaV2.3 instructs dendrite identity downstream undefined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defining the CaV\\u03b23 GK-domain leucine quartet as a determinant of CaV2.3 surface density established a structural basis for trafficking control.\",\n      \"evidence\": \"GK-domain mutagenesis with surface biotinylation and electrophysiology in heterologous cells\",\n      \"pmids\": [\"22846999\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trafficking machinery downstream of \\u03b2 binding unidentified\", \"Relevance in native neurons untested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"CaV2.3 was shown to drive sperm acrosome exocytosis under GM1/sterol control and to be inhibited via GABABR/c-Src phosphorylation of C-terminal tyrosines Y1761/Y1765, expanding its regulatory and physiological scope.\",\n      \"evidence\": \"KO mice, sperm Ca2+ imaging and AE assays, oocyte voltage clamp, lipid manipulation; tyrosine mutagenesis with c-Src manipulation and pertussis toxin in HEK cells\",\n      \"pmids\": [\"24525187\", \"24688019\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular contact of GM1 with channel not resolved\", \"In vivo neuronal role of GABABR/c-Src pathway untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identifying miR-34c-5p as a 3'UTR-targeting repressor of CaV2.3 in DRG neurons added post-transcriptional control and an antinociceptive role in peripheral sensory neurons.\",\n      \"evidence\": \"Luciferase 3'UTR reporter, in vivo DRG knockdown, cancer pain model, cultured DRG neurons\",\n      \"pmids\": [\"28614186\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; direct endogenous miRNA-target occupancy not shown\", \"Mechanism of channel-dependent hypersensitivity unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Knockout neuroprotection and reciprocal NCS-1 regulation implicated CaV2.3 in dopaminergic neuron vulnerability, and FMRP binding/repression of CaV2.3 mRNA tied the channel to translational control relieved by group I mGluRs.\",\n      \"evidence\": \"CaV2.3 and NCS-1 KO mice, neurotoxin PD model, Ca2+ imaging, iPSC model; FMRP-mRNA binding in synaptoneurosomes, KO Western blot, R-type current recordings with mGluR pharmacology\",\n      \"pmids\": [\"31704946\", \"31350260\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal chain from Ca2+ load to degeneration not fully resolved\", \"FMRP regulatory site on CaV2.3 mRNA not mapped\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"KCTD8/KCTD12b were identified as direct CaV2.3 binders at presynaptic active zones, and a NTSR2/CaV2.3 axis was shown to mediate contulakin-G spinal antinociception, defining presynaptic regulatory partners and an analgesic pathway.\",\n      \"evidence\": \"Co-IP, electrophysiology, active-zone co-localization, KCTD KO mice; CRISPR/Cas9 NTSR2 editing, DRG and spinal cord electrophysiology, synaptic fractionation\",\n      \"pmids\": [\"33913808\", \"35050960\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of KCTD-CaV2.3 binding undefined\", \"Direct vs indirect NTSR2-CaV2.3 coupling not fully resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrating that \\u03b22a/\\u03b22e splice variants stabilize CaV2.3 gating during pacemaking explained how the channel sustains current in repetitively firing dopaminergic neurons.\",\n      \"evidence\": \"tsA-201 expression with \\u03b22 splice variants, simulated-pacemaking patch-clamp, native SN neuron recordings with SNX-482, RT-PCR\",\n      \"pmids\": [\"35792082\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of each \\u03b22 variant in vivo unclear\", \"Link to degeneration phenotype not directly tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identifying CaV2.3 as a CDKL5 phosphorylation substrate whose dephosphorylation produces channel gain-of-function mechanistically connected CDKL5 deficiency disorder and CACNA1E gain-of-function epileptic encephalopathy.\",\n      \"evidence\": \"SILAC phosphoproteomics, recombinant channel electrophysiology, phosphomutant knock-in mice with excitability measurements\",\n      \"pmids\": [\"38081835\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise phosphosite consequences on gating structure not resolved\", \"Therapeutic implications untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the many regulatory inputs (kinases, G-proteins, auxiliary subunits, RNA-binding/miRNA control) are integrated to set CaV2.3 function in each native cell type, and the structural basis of pathogenic gain-of-function, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution structure of full CaV2.3 complex in the corpus\", \"Cell-type-specific combinatorial regulation not mapped\", \"Mechanistic basis of DEE69 mutations beyond CDKL5 link undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 5, 10]},\n      {\"term_id\": \"GO:0005216\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 1, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [12, 18, 20]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [10, 8, 17]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 15, 14]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [5, 13]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CACNB3\", \"CDKL5\", \"FMR1\", \"KCTD8\", \"KCTD12B\", \"HSPA8\", \"NCS1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}