{"gene":"CACNA1D","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":2001,"finding":"Human CaV1.3 (α1D) splice variant containing exon 8A forms L-type Ca²⁺ channels that activate at more negative voltages (threshold ~−45.7 mV) and inactivate more slowly than CaV1.2; reduced dihydropyridine sensitivity results from voltage-dependence of DHP block rather than lower binding affinity, as shown by radioligand binding and patch-clamp in tsA-201 cells.","method":"Whole-cell patch-clamp electrophysiology, radioligand binding, heterologous expression in tsA-201 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro electrophysiology with multiple biophysical parameters, radioligand binding; single rigorous study with orthogonal methods","pmids":["11285265"],"is_preprint":false},{"year":2001,"finding":"CaV1.3 channels from neuroendocrine cells are stimulated (rather than inhibited) by ligand-bound Gi/Go-coupled GPCRs, an effect mimicked by phorbol ester and blocked by serine/threonine kinase inhibitors but not PI3K inhibitor wortmannin, indicating PKC-dependent regulation distinct from CaV2.2.","method":"Xenopus oocyte expression, whole-cell patch-clamp, pharmacological dissection","journal":"Molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — heterologous expression with pharmacological controls; single lab","pmids":["11435619"],"is_preprint":false},{"year":2003,"finding":"Genetic knockout of Cav1.3 in mice abolishes the L-type Ca²⁺ current component activating at diastolic depolarization voltages in sinoatrial node cells, demonstrating that Cav1.3 channels are essential for cardiac pacemaker diastolic depolarization and that their absence causes bradycardia and spontaneous arrhythmia.","method":"Gene-targeted knockout mice, patch-clamp recording of sinoatrial node cells, pharmacological L-type current analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with clean electrophysiological phenotype; replicated across multiple labs","pmids":["12700358"],"is_preprint":false},{"year":2003,"finding":"CaV1.3 channels are the dominant voltage-gated Ca²⁺ channels in cochlear inner hair cells (IHCs); their absence in CaV1.3-/- mice nearly eliminates evoked exocytosis, prevents normal IHC maturation (loss of Ca²⁺ action potentials, failure to acquire BK channels, persistence of efferent cholinergic input), and leaves exocytosis triggered by flash photolysis of caged Ca²⁺ intact, indicating tight coupling of CaV1.3 to exocytosis.","method":"Patch-clamp, membrane capacitance measurements, photolysis of caged Ca²⁺, pharmacological channel subtype identification in CaV1.3-/- mice","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods in genetic KO; foundational study, highly cited","pmids":["14645476"],"is_preprint":false},{"year":2005,"finding":"CaV1.3 channels cluster preferentially at ribbon-type active zones of IHCs (~80 channels/active zone); nonstationary fluctuation analysis estimates ~1700 total channels. Manipulation of single-channel current vs. open-channel number reveals nanodomain Ca²⁺ coupling: RRP exocytosis has high intrinsic Ca²⁺ cooperativity with single-channel current but near-unity apparent cooperativity with channel number, indicating few nearby CaV1.3 channels impose nanodomain [Ca²⁺] on release sites.","method":"Nonstationary fluctuation analysis, immunohistochemistry, membrane capacitance recordings, pharmacological manipulation of single-channel current","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal quantitative methods; high citation, foundational mechanistic study","pmids":["16354915"],"is_preprint":false},{"year":2005,"finding":"The long C-terminal splice variant of CaV1.3 (CaV1.3a) contains SH3- and PDZ-binding motifs that directly and specifically associate with the scaffolding protein Shank (yeast two-hybrid, in vitro pull-down); Shank-binding is necessary and sufficient for synaptic clustering of CaV1.3 in hippocampal neurons and is required for CaV1.3-mediated pCREB signaling.","method":"Yeast two-hybrid, in vitro binding assay, immunocytochemistry in hippocampal neurons, dominant-negative peptide experiments, dihydropyridine-resistant mutant channels","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — yeast two-hybrid confirmed by in vitro pull-down and functional neuronal experiments; replicated by companion paper (PMID 15689540)","pmids":["15689539"],"is_preprint":false},{"year":2005,"finding":"D2 dopaminergic and M1 muscarinic receptors selectively modulate CaV1.3 (not other L-type channels) in striatal medium spiny neurons; this modulation requires the CaV1.3 PDZ-binding domain and its interaction with Shank, and Shank–Homer interaction, establishing a signaling complex at corticostriatal synapses that enables GPCR regulation of CaV1.3 and glutamatergic integration.","method":"Electrophysiology in striatal neurons, intracellular dialysis of competing peptides, CaV1.3 knockout mice, immunocytochemistry","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — genetic KO, peptide competition, electrophysiology; multiple orthogonal methods; replicated with companion paper","pmids":["15689540"],"is_preprint":false},{"year":2006,"finding":"IGF-1/RTK modulates CaV1.3 channels via a PLC→IP3-store Ca²⁺ release→CaMKII cascade; CaMKII phosphorylation of serine S1486 in the EF-hand motif of the CaV1.3 α1 subunit is required, causing a hyperpolarizing shift in current-voltage relationship and potentiation of peak currents, and contributing to pCREB activation.","method":"Site-directed mutagenesis (S1486A), pharmacological inhibitors, patch-clamp, pCREB immunostaining in cortical/hippocampal neurons","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 — site-directed mutagenesis identifying specific phosphorylation site with functional validation; multiple methods","pmids":["16763033"],"is_preprint":false},{"year":2006,"finding":"PKA (via membrane-permeable 8-bromo-cAMP) phosphorylates the CaV1.3 α1 subunit and significantly increases α1D Ca²⁺ channel current density in tsA201 cells; this increase is blocked by the PKA inhibitor PKI, demonstrating PKA-dependent positive modulation of CaV1.3.","method":"Heterologous expression in tsA201 cells, whole-cell patch-clamp, pharmacology, Western blot phosphorylation assay","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"Medium","confidence_rationale":"Tier 2 — electrophysiology with pharmacological inhibition and biochemical phosphorylation evidence; single lab","pmids":["15615842"],"is_preprint":false},{"year":2006,"finding":"PKC inhibits CaV1.3 Ca²⁺ channels through phosphorylation of serine 81 at the N-terminal region; introduction of a phosphomimetic S81D recapitulates inhibition, and dialysis of a competing 35-aa peptide containing S81 prevents PKC modulation; βII- and εPKC isoforms are specifically responsible.","method":"Site-directed mutagenesis (S81D), competing peptide dialysis, isoform-specific PKC pharmacology, whole-cell patch-clamp in tsA201 cells","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis identifying specific phosphorylation site plus peptide competition and isoform pharmacology","pmids":["16973824"],"is_preprint":false},{"year":2007,"finding":"CaBP1, a calmodulin-like Ca²⁺-binding protein, blunts Ca²⁺-dependent inactivation (CDI) of CaV1.3 by interacting with calmodulin-binding sequences in the CaV1.3 α1 subunit; CaBP1 is strongly localized at presynaptic ribbon synapses of adult IHCs and is implicated in conferring anomalously slow CDI required for auditory transmission. CaBP4 interacts with the same sequences but suppresses CDI less efficiently.","method":"Co-immunoprecipitation, heterologous expression with patch-clamp, immunolocalization in IHCs, CaBP4-/- mice","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal binding, functional electrophysiology, genetic KO control; multiple orthogonal methods","pmids":["17947313"],"is_preprint":false},{"year":2007,"finding":"CaV1.3 and RyR2 physically interact via the CaV1.3 N-terminus (identified by yeast two-hybrid and confirmed by co-immunoprecipitation) in rat hippocampus; depolarization activating L-type Ca²⁺ channels triggers RyR2-dependent Ca²⁺ release even without extracellular Ca²⁺, and this effect is blocked by siRNA silencing of CaV1.3.","method":"Yeast two-hybrid, co-immunoprecipitation, immunocytochemistry, siRNA knockdown, Ca²⁺ imaging in hippocampal neurons","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — yeast two-hybrid plus co-IP plus siRNA functional validation; multiple orthogonal methods","pmids":["17823125"],"is_preprint":false},{"year":2008,"finding":"Alternative splicing in the CaV1.3 C-terminus generates long (CaV1.3₄₂) and short (CaV1.3₄₂A) forms; the long form contains a C-terminal modulatory domain (CTM) whose removal (short form or CaV1.3ΔC116 truncation) shifts activation to more negative voltages and enhances Ca²⁺-dependent inactivation. FRET experiments confirm intramolecular C-terminal protein interaction that modulates calmodulin binding to the IQ domain.","method":"Heterologous expression in HEK-293 cells, whole-cell patch-clamp, FRET, truncation/deletion constructs, co-expression of C-terminal peptide","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstitution of modular domain, FRET structural validation, mutagenesis/truncation; replicated by subsequent studies","pmids":["18482979"],"is_preprint":false},{"year":2008,"finding":"The otoferlin C2D domain directly binds the CaV1.3 II-III loop in a Ca²⁺-dependent manner; the deafness-causing mutation L1011P in C2D renders this interaction Ca²⁺-insensitive and greatly reduced, while the C2F domain binds syntaxin 1A and SNAP-25, defining otoferlin as a molecular link between the Ca²⁺ channel and the SNARE complex at IHC synapses.","method":"Fusion protein pull-down with disease-associated mutants, Ca²⁺-dependent binding assays, Kd measurements","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with mutagenesis of disease variants; rigorous biochemical characterization","pmids":["19004828"],"is_preprint":false},{"year":2009,"finding":"Whirlin (USH2D protein) specifically interacts with CaV1.3 via PDZ domain binding (confirmed by yeast two-hybrid, GST pull-down, co-immunoprecipitation); CaV1.3 and whirlin co-localize at the connecting cilium and photoreceptor synapse in adult retina, integrating CaV1.3 into the Usher protein network.","method":"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, immunofluorescence and immunoelectron microscopy in retina","journal":"Investigative ophthalmology & visual science","confidence":"High","confidence_rationale":"Tier 2 — three orthogonal biochemical binding assays plus in vivo co-localization","pmids":["19959638"],"is_preprint":false},{"year":2010,"finding":"CaV1.3 undergoes Ca²⁺-dependent facilitation (CDF) only when densin and CaMKII are co-expressed together; facilitation requires Ca²⁺, CaMKII activation, CaMKII–densin association, and densin binding to the CaV1.3 α1 C-terminal domain. CaV1.3, densin, and CaMKII form a complex in brain and co-localize at dendritic spines.","method":"Heterologous expression in HEK293T cells, co-immunoprecipitation from brain, patch-clamp, dominant-negative CaMKII","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — biochemical complex identification plus functional electrophysiology with multiple genetic/pharmacological controls; multiple orthogonal methods","pmids":["20392935"],"is_preprint":false},{"year":2010,"finding":"CaV1.3 directly associates with GABABR2 via yeast two-hybrid, GST pull-down, and co-immunoprecipitation; GABAB receptor activation increases CaV1.3 (but not CaV1.2) currents and intracellular Ca²⁺, demonstrating subtype-specific functional coupling between GABABR and CaV1.3.","method":"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, patch-clamp, Ca²⁺ imaging in HEK293 and hippocampal neurons","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 — three orthogonal binding assays plus functional validation; single lab","pmids":["20627102"],"is_preprint":false},{"year":2010,"finding":"RIM2α binds to the β-subunit of the CaV1.3 channel complex, co-localizes with CaV1.3 at IHC presynaptic active zones, and slows both Ca²⁺-dependent and voltage-dependent inactivation of CaV1.3 channels, generating a non-inactivating current component characteristic of IHC CaV1.3 currents.","method":"Co-localization in IHCs, heterologous expression in tsA-201 cells, patch-clamp","journal":"Molecular and cellular neurosciences","confidence":"Medium","confidence_rationale":"Tier 2 — functional electrophysiology with binding evidence and localization; single lab","pmids":["20363327"],"is_preprint":false},{"year":2010,"finding":"Loss of function of CACNA1D in humans (insertion of glycine causing non-conducting channels with abnormal voltage-dependent gating) causes SANDD syndrome (sinoatrial node dysfunction and deafness), establishing that CaV1.3 is required for human SAN pacemaking and auditory hair cell function.","method":"Positional cloning, Sanger sequencing, heterologous expression with patch-clamp of mutant channels","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 — human channelopathy identified by positional cloning with functional electrophysiological validation of mechanism; highly cited","pmids":["21131953"],"is_preprint":false},{"year":2011,"finding":"Harmonin, a PDZ-domain scaffolding protein required for mechanosensory function, associates with CaV1.3 at IHC presynapses and limits CaV1.3 channel surface availability through a ubiquitin-dependent degradation pathway.","method":"Co-immunoprecipitation at IHC synapse, ubiquitin pathway assay, immunofluorescence","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 — biochemical interaction confirmed at native synapse with defined ubiquitin mechanism","pmids":["21822269"],"is_preprint":false},{"year":2011,"finding":"The C-terminus of CaV1.3 translocates to the nucleus in atrial myocytes in a Ca²⁺-dependent manner, where it functions as a transcriptional regulator to modulate SK2 channel expression; CaV1.3 null mice show decreased myosin light chain 2 protein, which interacts with SK2 to regulate its membrane localization.","method":"Nuclear fractionation, CaV1.3-/- mouse model, Western blot, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — subcellular fractionation plus KO validation; single lab, novel mechanism","pmids":["25538241"],"is_preprint":false},{"year":2012,"finding":"Zebrafish CaV1.3a channels regulate synaptic ribbon size in hair cells: genetic disruption or acute pharmacological block enlarges ribbons, while channel activation reduces ribbon size and intact synapses. Ca²⁺ influx through CaV1.3a is required for synaptic maintenance; effects are not due to loss of neurotransmission.","method":"In vivo Ca²⁺ imaging, confocal and super-resolution microscopy, genetic mutants, pharmacological manipulation, vglut3 mutant controls in zebrafish","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — genetic and pharmacological dissection with super-resolution imaging; ortholog in zebrafish; multiple controls","pmids":["23197719"],"is_preprint":false},{"year":2012,"finding":"CaV1.3 channels in the sinoatrial node co-localize with ryanodine receptors in sarcomeric structures (while CaV1.2 is restricted to delimiting membrane); CaV1.3 undergoes stronger voltage-dependent facilitation (VDF) than CaV1.2 during recovery from inactivation, which enhances pacemaker recovery after pauses via preferential coupling to RyR-mediated Ca²⁺ release.","method":"Patch-clamp with DHP-insensitive CaV1.2 knock-in mice to isolate channel-specific currents, immunofluorescence co-localization, computational modeling","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 2 — genetic knock-in model to isolate CaV1.3 current, immunolocalization, and modeling; multiple orthogonal approaches","pmids":["23045342"],"is_preprint":false},{"year":2013,"finding":"Somatic mutations altering Gly403 or Ile770 in the S6 pore-lining segments of CACNA1D cause gain-of-function in aldosterone-producing adenomas: Gly403 mutations shift activation to less depolarized potentials and impair inactivation; both lead to increased Ca²⁺ influx driving aldosterone production. Identical positions mutated as germline de novo cause primary aldosteronism with neuromuscular abnormalities.","method":"Whole-exome sequencing, heterologous expression of mutant channels, whole-cell patch-clamp in tsA-201 cells","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 1–2 — structure-function with mutants expressed and electrophysiologically characterized; landmark paper, 471 citations","pmids":["23913001"],"is_preprint":false},{"year":2013,"finding":"RNA editing by ADAR2 at the IQ domain of CaV1.3 (within exon 41) reduces Ca²⁺-dependent inactivation (CDI) by weakening prebinding of Ca²⁺-free calmodulin (apoCaM) to the channel rather than attenuating Ca²⁺/CaM binding; this makes CDI continuously tunable by fluctuations in ambient calmodulin levels, an effect confirmed in substantia nigral neurons.","method":"Heterologous expression with RNA-edited channels, patch-clamp, calmodulin titration, recordings from substantia nigra neurons","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 — mechanistic dissection via edited channel variants, calmodulin titration, and native neuron validation; multiple orthogonal methods","pmids":["24120865"],"is_preprint":false},{"year":2013,"finding":"Harmonin binding to the CaV1.3 α1 distal C-terminus (dCT) enhances voltage-dependent facilitation (VDF) of CaV1.3 currents in HEK293T cells and in mouse IHCs; dfcr harmonin mutant that cannot bind α1 dCT fails to promote VDF and reduces synchronous exocytosis in mature IHCs, demonstrating a multifaceted presynaptic role of harmonin in regulating CaV1.3 and exocytosis.","method":"Heterologous expression with mutant harmonin variants, patch-clamp, membrane capacitance recordings in IHCs from dfcr mice","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 2 — genetic mouse model with domain-specific mutations, functional electrophysiology in native cells; multiple orthogonal methods","pmids":["23613530"],"is_preprint":false},{"year":2014,"finding":"De novo CACNA1D mutations p.A749G and p.G407R in autism spectrum disorder patients cause gain-of-function: p.A749G shifts voltage-dependence of activation and inactivation ~15 mV negative; p.G407R markedly slows current inactivation; both increase Ca²⁺ influx through CaV1.3.","method":"Whole-cell patch-clamp of mutant channels expressed in tsA-201 cells","journal":"Biological psychiatry","confidence":"High","confidence_rationale":"Tier 1 — direct electrophysiological characterization of disease mutations in heterologous system","pmids":["25620733"],"is_preprint":false},{"year":2014,"finding":"The C-terminal modulatory domain (CTM) controls coupling of voltage-sensor movement to pore opening in CaV1.3: the CTM weakens this coupling so that a greater fraction of charge must move before channel opening; removal of CTM (short splice variant CaV1.3₄₂A) enhances coupling efficiency, shifting activation ~7.2 mV negative without affecting voltage-sensor charge movement.","method":"Gating current measurement (QON-V) and ionic current recording in tsA-201 cells expressing long and short CaV1.3 splice variants","journal":"Biophysical journal","confidence":"High","confidence_rationale":"Tier 1 — biophysical dissection of voltage-sensor vs. gate coupling using gating currents; clean mechanistic study","pmids":["24703308"],"is_preprint":false},{"year":2015,"finding":"RIM2α and RIM2β are expressed at IHC active zones and promote clustering of CaV1.3 channels; RIM2α-deficient IHCs have fewer synaptic CaV1.3 channels (confirmed by superresolution microscopy), reduced Ca²⁺ influx, and proportionally reduced exocytosis; RIM2 binds the channel β-subunit.","method":"Immunofluorescence, superresolution microscopy, patch-clamp fluctuation analysis, Ca²⁺ imaging, electron tomography, hair cell-specific conditional KO","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — conditional KO, superresolution imaging, biophysical fluctuation analysis, electron tomography; multiple rigorous methods","pmids":["26034270"],"is_preprint":false},{"year":2015,"finding":"In substantia nigra dopamine neurons, Cav1.3 L-type Ca²⁺ channel activity, together with internal Ca²⁺ and the neuronal calcium sensor NCS-1, is required for sensitization of D2-autoreceptor responses; Cav1.3 activity promotes NCS-1 interaction with D2 receptors, modulating inhibitory GIRK2-mediated feedback. This pathway is also active in human SN DA neurons and is altered in Parkinson's disease.","method":"Electrophysiology in brain slices from Cav1.3 KO and WT mice, pharmacological tools, in vivo manipulation with l-DOPA/cocaine, mRNA analysis of human SN neurons","journal":"Brain : a journal of neurology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO plus pharmacological dissection in native neurons, human data; multiple orthogonal methods","pmids":["24934288"],"is_preprint":false},{"year":2015,"finding":"The cell-type-specific function of the CaV1.3 C-terminal modulatory domain (CTM) differs between IHCs and chromaffin cells: CTM disruption impairs Ca²⁺-dependent inactivation in IHCs but increases it in chromaffin cells, causing hyperpolarized resting potential and reduced pacemaking in chromaffin cells.","method":"Knock-in mice with HA tag disrupting CTM, patch-clamp in IHCs and chromaffin cells, hearing threshold measurement","journal":"Frontiers in cellular neuroscience","confidence":"High","confidence_rationale":"Tier 2 — in vivo knock-in model with cell-type-specific electrophysiology; multiple cell types compared","pmids":["26379493"],"is_preprint":false},{"year":2016,"finding":"Cav1.3 channels provide Ca²⁺ influx during diastolic depolarization in SAN cells that triggers local RyR-dependent Ca²⁺ release events; Cav1.3-/- SAN cells show reduced frequency and impaired synchronization of local Ca²⁺ release, preventing Ca²⁺ transient generation and spontaneous activity. Caffeine-stimulated Ca²⁺-induced Ca²⁺ release rescues pacemaking in Cav1.3-/- cells.","method":"Ca²⁺ imaging in isolated SAN cells and ex vivo preparations from Cav1.3-/- and WT mice, action potential voltage-clamp commands, caffeine rescue experiments","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with live Ca²⁺ imaging and rescue experiments; multiple orthogonal methods","pmids":["26786159"],"is_preprint":false},{"year":2016,"finding":"The α2δ2 auxiliary subunit co-assembles with CaV1.3 at IHC presynapses; ducky (α2δ2-null) mice show 30-40% reduction of CaV1.3 Ca²⁺ and Ba²⁺ currents with altered gating, reduced exocytosis proportional to reduced Ca²⁺ influx, and impaired trans-synaptic alignment between presynaptic CaV1.3 clusters and postsynaptic AMPA receptor/PSD-95 clusters.","method":"Patch-clamp, immunofluorescence, Ca²⁺ imaging in ducky null mouse IHCs","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — genetic null model with electrophysiology, immunolocalization, and trans-synaptic analysis; multiple methods","pmids":["27798183"],"is_preprint":false},{"year":2017,"finding":"De novo CACNA1D mutation V401L (in the activation gate) causes gain-of-function in a patient with ASD and epilepsy: significantly increases current density, shifts activation and inactivation to more negative voltages, and reduces inactivation in both long and short CaV1.3 splice variants; mutant channels retain full sensitivity to isradipine.","method":"Whole-cell patch-clamp of V401L mutant channels expressed in tsA-201 cells, both splice variants tested","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1 — direct electrophysiological characterization with both splice variants; disease variant with mechanistic characterization","pmids":["28472301"],"is_preprint":false},{"year":2018,"finding":"Brain-selective RNA editing of CaV1.3 transcripts is restricted to neurons by splicing factor SRSF9, which inhibits ADAR2-mediated editing. Mechanistically, SRSF9 directly binds the RNA duplex required for editing (formed between exon 41 and an intronic editing-site complementary sequence), and selective down-regulation of SRSF9 in neurons enables neuron-specific CaV1.3 editing.","method":"Minigene editing assay with ADAR2 and SRSF9, CLIP/RIP to demonstrate direct RNA binding, SRSF9 knockdown/overexpression","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 — mechanistic dissection with reconstitution (minigene), direct RNA binding demonstration, and functional modulation","pmids":["29733375"],"is_preprint":false},{"year":2016,"finding":"An autism-associated de novo mutation A760G (equivalent to A749G in another numbering) severely diminishes Ca²⁺-dependent inactivation (CDI) of CaV1.3 by enhancing channel opening within the Ca²⁺-inactivated mode; simultaneously, A760G increases voltage-dependent inactivation (VDI), creating opposing regulatory effects that together increase intracellular Ca²⁺.","method":"Whole-cell patch-clamp of mutant channels, allosteric gating model analysis","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 — direct biophysical characterization with mechanistic modeling","pmids":["27255217"],"is_preprint":false},{"year":2020,"finding":"CACNA1D gain-of-function mutation S652L shifts voltage-dependence of activation and steady-state inactivation ~13-17 mV negative, increases window currents at subthreshold voltages, slows tail currents, and increases Ca²⁺ during AP-like stimuli; it also increases sensitivity to isradipine 3-4-fold. The contrasting loss-of-function S652W mutation shifts gating positive, confirming that only gain-of-function variants confer high disease risk.","method":"Whole-cell patch-clamp of mutant and wild-type CaV1.3 in tsA-201 cells, isradipine dose-response","journal":"Molecular autism","confidence":"High","confidence_rationale":"Tier 1 — comparative mutagenesis (GOF vs LOF at same site) with AP-clamp and pharmacological validation","pmids":["31921405"],"is_preprint":false}],"current_model":"CACNA1D encodes the pore-forming α1D subunit of the CaV1.3 L-type Ca²⁺ channel, which activates at uniquely negative voltages (controlled by C-terminal splice variants and RNA editing that modulate CTM-dependent coupling of voltage sensing to pore opening), undergoes Ca²⁺-dependent inactivation regulated by calmodulin and CaBPs at the IQ/EF-hand domains, is phosphorylated by PKA (potentiating, at unspecified sites), PKC-βII/ε (inhibitory, at N-terminal S81), and CaMKII (facilitating via EF-hand S1486); it clusters at postsynaptic densities and presynaptic ribbon active zones through PDZ interactions with Shank and harmonin (the latter also promoting ubiquitin-dependent degradation), is scaffolded with RIM2α/β (which stabilize channel abundance at hair cell active zones), physically couples to RyR2 and GABABR2 for intracellular Ca²⁺ amplification and neuromodulation, and is regulated by the auxiliary α2δ2 subunit and RIM2 for trans-synaptic organization; gain-of-function mutations in S6 pore-lining segments cause aldosterone-producing adenomas, primary aldosteronism, autism spectrum disorder, and congenital hyperinsulinism, while loss-of-function causes SANDD syndrome (sinoatrial node dysfunction and deafness)."},"narrative":{"teleology":[{"year":2001,"claim":"Establishing that CaV1.3 activates at uniquely negative voltages distinguished it from CaV1.2 and explained how L-type channels could operate at subthreshold potentials in pacemaker and sensory cells.","evidence":"Whole-cell patch-clamp and radioligand binding of exon 8A splice variant in tsA-201 cells","pmids":["11285265"],"confidence":"High","gaps":["Molecular basis of negative activation threshold not yet mapped to specific structural domains","In vivo splice variant distribution unknown"]},{"year":2001,"claim":"Demonstrating PKC-dependent stimulation of CaV1.3 by Gi/Go-coupled GPCRs revealed a GPCR modulatory pathway distinct from CaV2.2 inhibition.","evidence":"Pharmacological dissection in Xenopus oocyte expression system","pmids":["11435619"],"confidence":"Medium","gaps":["PKC phosphorylation site not identified in this study","Not confirmed in native neuroendocrine cells"]},{"year":2003,"claim":"Genetic knockout established that CaV1.3 is essential for both cardiac pacemaker diastolic depolarization and cochlear inner hair cell exocytosis, defining its two principal physiological roles.","evidence":"CaV1.3−/− mice with patch-clamp of SAN cells and IHC capacitance measurements","pmids":["12700358","14645476"],"confidence":"High","gaps":["Molecular identity of CaV1.3 coupling partners at IHC active zones unknown","Contribution of other channel types to residual pacemaking not fully resolved"]},{"year":2005,"claim":"Quantification of CaV1.3 clustering at ribbon active zones and demonstration of nanodomain Ca²⁺ coupling to vesicle release established the biophysical framework for how few channels drive transmitter release at auditory synapses.","evidence":"Nonstationary fluctuation analysis, immunohistochemistry, and capacitance recordings in IHCs","pmids":["16354915"],"confidence":"High","gaps":["Identity of the molecular tether linking CaV1.3 to release sites unknown","Single-channel properties in native IHCs not directly measured"]},{"year":2005,"claim":"Identification of Shank as a PDZ-domain scaffold that clusters CaV1.3 at synapses and enables GPCR modulation resolved how CaV1.3 is positioned in postsynaptic signaling complexes.","evidence":"Yeast two-hybrid, pull-down, dominant-negative peptides in hippocampal neurons; D2/M1 receptor modulation requiring Shank–Homer in striatal neurons from CaV1.3 KO mice","pmids":["15689539","15689540"],"confidence":"High","gaps":["Shank interaction stoichiometry unknown","Whether Shank mediates CaV1.3 clustering at all synapse types untested"]},{"year":2006,"claim":"Mapping specific kinase phosphorylation sites—CaMKII at S1486 (facilitating) and PKC-βII/ε at S81 (inhibitory)—and PKA-dependent potentiation defined the phosphoregulatory landscape of CaV1.3.","evidence":"Site-directed mutagenesis, phosphomimetic constructs, isoform-specific pharmacology, and patch-clamp in tsA-201 and cortical neurons","pmids":["16763033","16973824","15615842"],"confidence":"High","gaps":["PKA phosphorylation site on α1D not identified","In vivo relevance of each phosphorylation event not established"]},{"year":2007,"claim":"Discovery that CaBP1 suppresses Ca²⁺-dependent inactivation at IHC ribbon synapses and that CaV1.3 physically couples to RyR2 for voltage-triggered intracellular Ca²⁺ release expanded the Ca²⁺-sensing and amplification machinery associated with CaV1.3.","evidence":"Co-immunoprecipitation, heterologous electrophysiology, yeast two-hybrid, siRNA knockdown in hippocampal neurons, IHC immunolocalization","pmids":["17947313","17823125"],"confidence":"High","gaps":["CaBP1 binding site on CaV1.3 not mapped at residue level","Stoichiometry of CaV1.3–RyR2 coupling complex unknown"]},{"year":2008,"claim":"Identification of the C-terminal modulatory domain (CTM) as an intramolecular brake that weakens calmodulin binding and shifts activation positive revealed how alternative C-terminal splicing tunes CaV1.3 gating.","evidence":"FRET, truncation constructs, and patch-clamp of long vs. short splice variants in HEK-293 cells","pmids":["18482979"],"confidence":"High","gaps":["CTM structural basis at atomic level unresolved","Relative expression of long vs. short splice variants across tissues not systematically mapped"]},{"year":2008,"claim":"Demonstration that otoferlin C2D domain binds the CaV1.3 II–III loop in a Ca²⁺-dependent manner, disrupted by the deafness mutation L1011P, established the molecular link between the Ca²⁺ channel and the SNARE-associated release machinery at IHC synapses.","evidence":"Fusion protein pull-down with disease mutants and Ca²⁺-dependent binding assays","pmids":["19004828"],"confidence":"High","gaps":["Functional consequence of disrupting this interaction on exocytosis not directly tested in this study","Whether otoferlin replaces synaptotagmin function entirely at IHC synapses not resolved"]},{"year":2010,"claim":"Discovery that SANDD syndrome results from a loss-of-function CACNA1D mutation proved CaV1.3 is indispensable for human sinoatrial pacemaking and hearing, translating mouse knockout findings to human disease.","evidence":"Positional cloning in consanguineous family, Sanger sequencing, heterologous expression of mutant channels with patch-clamp","pmids":["21131953"],"confidence":"High","gaps":["Prevalence of CACNA1D loss-of-function variants in unexplained bradycardia or deafness not established","No rescue or gene therapy attempted"]},{"year":2010,"claim":"Identification of densin–CaMKII complex as required for Ca²⁺-dependent facilitation, RIM2α/β as modulators of inactivation and channel clustering, and GABABR2 as a direct binding partner expanded the macromolecular signaling complex at CaV1.3-containing synapses.","evidence":"Co-immunoprecipitation from brain, heterologous electrophysiology, co-localization in IHCs, yeast two-hybrid and GST pull-down for GABABR2","pmids":["20392935","20363327","20627102"],"confidence":"High","gaps":["GABABR2–CaV1.3 interaction confirmed in single lab","Structural basis for RIM2–β-subunit interaction unresolved"]},{"year":2011,"claim":"Showing that harmonin promotes ubiquitin-dependent degradation of CaV1.3 while also enhancing voltage-dependent facilitation revealed a dual scaffolding/quality-control mechanism at IHC presynapses.","evidence":"Co-immunoprecipitation at native IHC synapse, ubiquitin assay, and electrophysiology in dfcr harmonin mutant mice","pmids":["21822269","23613530"],"confidence":"High","gaps":["E3 ligase responsible for CaV1.3 ubiquitination not identified","Whether harmonin-mediated degradation is activity-dependent unknown"]},{"year":2013,"claim":"Discovery that somatic CACNA1D gain-of-function mutations in S6 segments cause aldosterone-producing adenomas established CaV1.3 as a driver of autonomous aldosterone secretion and primary aldosteronism.","evidence":"Whole-exome sequencing of adenomas, heterologous expression and patch-clamp of G403R and I770M mutants","pmids":["23913001"],"confidence":"High","gaps":["Frequency of CACNA1D mutations across all aldosterone-producing adenomas not fully defined","Downstream transcriptional programs activated by mutant CaV1.3 in adrenal cells not mapped"]},{"year":2013,"claim":"Elucidation that ADAR2-mediated RNA editing at the IQ domain weakens apoCaM prebinding rather than Ca²⁺/CaM binding established a continuously tunable mechanism for CDI regulation unique to neurons.","evidence":"Patch-clamp of edited channel variants with calmodulin titration, substantia nigra neuron recordings","pmids":["24120865"],"confidence":"High","gaps":["Editing levels across brain regions and disease states incompletely characterized","Whether editing and CTM splicing interact combinatorially untested"]},{"year":2014,"claim":"Biophysical demonstration that CTM controls voltage-sensor–to–pore coupling efficiency (not voltage-sensor movement itself) provided a mechanistic explanation for how C-terminal splicing shifts CaV1.3 activation threshold.","evidence":"Gating current (QON-V) vs. ionic current recordings of long and short splice variants in tsA-201 cells","pmids":["24703308"],"confidence":"High","gaps":["Structural interaction between CTM and voltage-sensing domains not visualized","Whether CTM coupling mechanism is conserved across CaV1 family unknown"]},{"year":2014,"claim":"Characterization of de novo CACNA1D mutations A749G and G407R as gain-of-function in autism spectrum disorder patients linked CaV1.3 hyperactivity to neurodevelopmental disease beyond aldosteronism.","evidence":"Whole-cell patch-clamp of mutant channels in tsA-201 cells; patient genotyping","pmids":["25620733"],"confidence":"High","gaps":["Circuit-level consequences of gain-of-function in developing brain not modeled","No animal model of these specific mutations"]},{"year":2015,"claim":"Conditional knockout and superresolution imaging of RIM2α at IHC active zones demonstrated that RIM proteins stabilize CaV1.3 channel number at release sites and that reduced channel number proportionally reduces exocytosis.","evidence":"Hair cell–specific RIM2α conditional KO, STED microscopy, fluctuation analysis, electron tomography","pmids":["26034270"],"confidence":"High","gaps":["Whether RIM2 directly tethers CaV1.3 or acts through β-subunit only is unresolved","Role of RIM1 at IHC synapses not addressed"]},{"year":2016,"claim":"Characterization of the α₂δ2 auxiliary subunit's role in CaV1.3 surface expression, gating, and trans-synaptic alignment with postsynaptic AMPA receptor clusters revealed an organizing function beyond simple current enhancement.","evidence":"Patch-clamp, immunofluorescence, and Ca²⁺ imaging in ducky (α₂δ2-null) mouse IHCs","pmids":["27798183"],"confidence":"High","gaps":["Mechanism of trans-synaptic signaling from presynaptic α₂δ2 to postsynaptic PSD-95/AMPA receptors not identified","Whether α₂δ2 similarly organizes CaV1.3 synapses in neurons unknown"]},{"year":2016,"claim":"Demonstration that CaV1.3 provides diastolic Ca²⁺ influx that triggers and synchronizes local RyR-dependent Ca²⁺ release events in SAN cells, rescuable by caffeine, refined the coupled-clock pacemaker model by defining CaV1.3 as the voltage-clock input to the Ca²⁺ clock.","evidence":"Live Ca²⁺ imaging in CaV1.3−/− and WT SAN cells with caffeine rescue","pmids":["26786159"],"confidence":"High","gaps":["Spatial relationship between CaV1.3 and RyR clusters in SAN not resolved at nanoscale","Contribution of CaV1.3 splice variants to SAN pacemaking not distinguished"]},{"year":2018,"claim":"Identification of SRSF9 as the splicing factor that restricts ADAR2-mediated CaV1.3 editing to neurons (by blocking the editing-site RNA duplex in non-neuronal cells) resolved the cell-type specificity of CaV1.3 RNA editing.","evidence":"Minigene editing assay, CLIP/RIP for direct SRSF9–RNA binding, SRSF9 knockdown/overexpression","pmids":["29733375"],"confidence":"High","gaps":["Whether SRSF9 regulation is dynamic within neurons (e.g., activity-dependent) unknown","Other edited sites in CaV1.3 not examined"]},{"year":2020,"claim":"Comparative analysis of gain-of-function (S652L) versus loss-of-function (S652W) mutations at the same residue established that only gain-of-function variants confer high disease risk and showed that GOF mutants can paradoxically increase DHP sensitivity, suggesting pharmacological rescue potential.","evidence":"Whole-cell patch-clamp with AP-clamp waveforms and isradipine dose-response in tsA-201 cells","pmids":["31921405"],"confidence":"High","gaps":["In vivo efficacy of isradipine for GOF CACNA1D channelopathies not tested","Whether increased DHP sensitivity generalizes across GOF mutations unknown"]},{"year":null,"claim":"Major open questions include the atomic structure of the CaV1.3 CTM–channel body interaction, the identity of the E3 ubiquitin ligase mediating harmonin-dependent CaV1.3 degradation, the combinatorial effects of RNA editing and C-terminal splicing on native channel behavior, and whether DHP pharmacotherapy can rescue gain-of-function channelopathies in vivo.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of full-length CaV1.3 with CTM","E3 ligase for harmonin-mediated ubiquitination unidentified","In vivo pharmacological rescue of GOF mutations untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,2,3,4,23]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[12,27]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,4,5,28,32]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[20]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[14]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[3,4,5,6,29]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,6,7,9,16,29]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[0,2,23,31]},{"term_id":"R-HSA-9709957","term_label":"Sensory Perception","supporting_discovery_ids":[3,4,21,25,28,32]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[18,23,26,33,36]}],"complexes":[],"partners":["SHANK1","RIM2","USH1C","RYR2","OTOF","CACNA2D2","CAMK2A","GABBR2"],"other_free_text":[]},"mechanistic_narrative":"CACNA1D encodes the pore-forming α1D subunit of the CaV1.3 L-type voltage-gated Ca²⁺ channel, which activates at uniquely negative membrane potentials and is essential for cardiac pacemaking, auditory hair cell synaptic transmission, and neuroendocrine signaling. Channel gating is tuned by C-terminal alternative splicing that controls a modulatory domain (CTM) regulating voltage-sensor–to–pore coupling [PMID:18482979, PMID:24703308], by ADAR2-mediated RNA editing at the IQ domain that modulates calmodulin-dependent inactivation [PMID:24120865, PMID:29733375], and by phosphorylation through PKA (potentiating), PKC-βII/ε (inhibitory at N-terminal S81), and CaMKII (facilitating at EF-hand S1486) [PMID:15615842, PMID:16973824, PMID:16763033]. CaV1.3 is organized at presynaptic ribbon active zones and postsynaptic densities through scaffolding interactions with Shank, harmonin, RIM2α/β, and the auxiliary α₂δ2 subunit, which together govern channel clustering, surface stability, trans-synaptic alignment, and coupling to vesicle release and RyR2-mediated Ca²⁺-induced Ca²⁺ release [PMID:15689539, PMID:21822269, PMID:26034270, PMID:27798183, PMID:17823125]. Loss-of-function mutations cause SANDD syndrome (sinoatrial node dysfunction and deafness) [PMID:21131953], while gain-of-function mutations in S6 pore-lining segments cause aldosterone-producing adenomas, primary aldosteronism, and autism spectrum disorder with epilepsy [PMID:23913001, PMID:25620733, PMID:28472301]."},"prefetch_data":{"uniprot":{"accession":"Q01668","full_name":"Voltage-dependent L-type calcium channel subunit alpha-1D","aliases":["Calcium channel, L type, alpha-1 polypeptide, isoform 2","Voltage-gated calcium channel subunit alpha Cav1.3"],"length_aa":2161,"mass_kda":245.1,"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-1D gives rise to L-type calcium currents. Long-lasting (L-type) calcium channels belong to the 'high-voltage activated' (HVA) group. They are blocked by dihydropyridines (DHP), phenylalkylamines, and by benzothiazepines 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-1D gives rise to L-type calcium currents 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-1D gives rise to L-type calcium currents 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-1D gives rise to L-type calcium currents","subcellular_location":"Membrane","url":"https://www.uniprot.org/uniprotkb/Q01668/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CACNA1D","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CACNA1D","total_profiled":1310},"omim":[{"mim_id":"617027","title":"HYPERALDOSTERONISM, FAMILIAL, TYPE IV; HALD4","url":"https://www.omim.org/entry/617027"},{"mim_id":"615474","title":"PRIMARY ALDOSTERONISM, SEIZURES, AND NEUROLOGIC ABNORMALITIES; PASNA","url":"https://www.omim.org/entry/615474"},{"mim_id":"614896","title":"SINOATRIAL NODE DYSFUNCTION AND DEAFNESS; SANDD","url":"https://www.omim.org/entry/614896"},{"mim_id":"611270","title":"NSF ATTACHMENT PROTEIN BETA; NAPB","url":"https://www.omim.org/entry/611270"},{"mim_id":"610388","title":"RRAD- AND GEM-LIKE GTPase 1; REM1","url":"https://www.omim.org/entry/610388"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear membrane","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CACNA1D"},"hgnc":{"alias_symbol":["Cav1.3","CACH3","CACN4"],"prev_symbol":["CCHL1A2","CACNL1A2"]},"alphafold":{"accession":"Q01668","domains":[{"cath_id":"1.20.120.350","chopping":"102-219_238-254","consensus_level":"medium","plddt":79.0006,"start":102,"end":254},{"cath_id":"1.20.120.350","chopping":"515-633","consensus_level":"medium","plddt":80.7196,"start":515,"end":633},{"cath_id":"1.20.120.350","chopping":"867-900_907-998","consensus_level":"high","plddt":79.4578,"start":867,"end":998},{"cath_id":"1.10.287","chopping":"1010-1070_1087-1158","consensus_level":"high","plddt":82.8753,"start":1010,"end":1158},{"cath_id":"1.10.238.10","chopping":"1167-1184_1470-1625","consensus_level":"medium","plddt":78.0251,"start":1167,"end":1625},{"cath_id":"1.20.120.350","chopping":"1192-1290_1312-1333","consensus_level":"medium","plddt":86.5268,"start":1192,"end":1333}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q01668","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q01668-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q01668-F1-predicted_aligned_error_v6.png","plddt_mean":64.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CACNA1D","jax_strain_url":"https://www.jax.org/strain/search?query=CACNA1D"},"sequence":{"accession":"Q01668","fasta_url":"https://rest.uniprot.org/uniprotkb/Q01668.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q01668/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q01668"}},"corpus_meta":[{"pmid":"23913001","id":"PMC_23913001","title":"Somatic 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reduced dihydropyridine sensitivity results from voltage-dependence of DHP block rather than lower binding affinity, as shown by radioligand binding and patch-clamp in tsA-201 cells.\",\n      \"method\": \"Whole-cell patch-clamp electrophysiology, radioligand binding, heterologous expression in tsA-201 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro electrophysiology with multiple biophysical parameters, radioligand binding; single rigorous study with orthogonal methods\",\n      \"pmids\": [\"11285265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CaV1.3 channels from neuroendocrine cells are stimulated (rather than inhibited) by ligand-bound Gi/Go-coupled GPCRs, an effect mimicked by phorbol ester and blocked by serine/threonine kinase inhibitors but not PI3K inhibitor wortmannin, indicating PKC-dependent regulation distinct from CaV2.2.\",\n      \"method\": \"Xenopus oocyte expression, whole-cell patch-clamp, pharmacological dissection\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — heterologous expression with pharmacological controls; single lab\",\n      \"pmids\": [\"11435619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Genetic knockout of Cav1.3 in mice abolishes the L-type Ca²⁺ current component activating at diastolic depolarization voltages in sinoatrial node cells, demonstrating that Cav1.3 channels are essential for cardiac pacemaker diastolic depolarization and that their absence causes bradycardia and spontaneous arrhythmia.\",\n      \"method\": \"Gene-targeted knockout mice, patch-clamp recording of sinoatrial node cells, pharmacological L-type current analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with clean electrophysiological phenotype; replicated across multiple labs\",\n      \"pmids\": [\"12700358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CaV1.3 channels are the dominant voltage-gated Ca²⁺ channels in cochlear inner hair cells (IHCs); their absence in CaV1.3-/- mice nearly eliminates evoked exocytosis, prevents normal IHC maturation (loss of Ca²⁺ action potentials, failure to acquire BK channels, persistence of efferent cholinergic input), and leaves exocytosis triggered by flash photolysis of caged Ca²⁺ intact, indicating tight coupling of CaV1.3 to exocytosis.\",\n      \"method\": \"Patch-clamp, membrane capacitance measurements, photolysis of caged Ca²⁺, pharmacological channel subtype identification in CaV1.3-/- mice\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods in genetic KO; foundational study, highly cited\",\n      \"pmids\": [\"14645476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CaV1.3 channels cluster preferentially at ribbon-type active zones of IHCs (~80 channels/active zone); nonstationary fluctuation analysis estimates ~1700 total channels. Manipulation of single-channel current vs. open-channel number reveals nanodomain Ca²⁺ coupling: RRP exocytosis has high intrinsic Ca²⁺ cooperativity with single-channel current but near-unity apparent cooperativity with channel number, indicating few nearby CaV1.3 channels impose nanodomain [Ca²⁺] on release sites.\",\n      \"method\": \"Nonstationary fluctuation analysis, immunohistochemistry, membrane capacitance recordings, pharmacological manipulation of single-channel current\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal quantitative methods; high citation, foundational mechanistic study\",\n      \"pmids\": [\"16354915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The long C-terminal splice variant of CaV1.3 (CaV1.3a) contains SH3- and PDZ-binding motifs that directly and specifically associate with the scaffolding protein Shank (yeast two-hybrid, in vitro pull-down); Shank-binding is necessary and sufficient for synaptic clustering of CaV1.3 in hippocampal neurons and is required for CaV1.3-mediated pCREB signaling.\",\n      \"method\": \"Yeast two-hybrid, in vitro binding assay, immunocytochemistry in hippocampal neurons, dominant-negative peptide experiments, dihydropyridine-resistant mutant channels\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — yeast two-hybrid confirmed by in vitro pull-down and functional neuronal experiments; replicated by companion paper (PMID 15689540)\",\n      \"pmids\": [\"15689539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"D2 dopaminergic and M1 muscarinic receptors selectively modulate CaV1.3 (not other L-type channels) in striatal medium spiny neurons; this modulation requires the CaV1.3 PDZ-binding domain and its interaction with Shank, and Shank–Homer interaction, establishing a signaling complex at corticostriatal synapses that enables GPCR regulation of CaV1.3 and glutamatergic integration.\",\n      \"method\": \"Electrophysiology in striatal neurons, intracellular dialysis of competing peptides, CaV1.3 knockout mice, immunocytochemistry\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO, peptide competition, electrophysiology; multiple orthogonal methods; replicated with companion paper\",\n      \"pmids\": [\"15689540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"IGF-1/RTK modulates CaV1.3 channels via a PLC→IP3-store Ca²⁺ release→CaMKII cascade; CaMKII phosphorylation of serine S1486 in the EF-hand motif of the CaV1.3 α1 subunit is required, causing a hyperpolarizing shift in current-voltage relationship and potentiation of peak currents, and contributing to pCREB activation.\",\n      \"method\": \"Site-directed mutagenesis (S1486A), pharmacological inhibitors, patch-clamp, pCREB immunostaining in cortical/hippocampal neurons\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — site-directed mutagenesis identifying specific phosphorylation site with functional validation; multiple methods\",\n      \"pmids\": [\"16763033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PKA (via membrane-permeable 8-bromo-cAMP) phosphorylates the CaV1.3 α1 subunit and significantly increases α1D Ca²⁺ channel current density in tsA201 cells; this increase is blocked by the PKA inhibitor PKI, demonstrating PKA-dependent positive modulation of CaV1.3.\",\n      \"method\": \"Heterologous expression in tsA201 cells, whole-cell patch-clamp, pharmacology, Western blot phosphorylation assay\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — electrophysiology with pharmacological inhibition and biochemical phosphorylation evidence; single lab\",\n      \"pmids\": [\"15615842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PKC inhibits CaV1.3 Ca²⁺ channels through phosphorylation of serine 81 at the N-terminal region; introduction of a phosphomimetic S81D recapitulates inhibition, and dialysis of a competing 35-aa peptide containing S81 prevents PKC modulation; βII- and εPKC isoforms are specifically responsible.\",\n      \"method\": \"Site-directed mutagenesis (S81D), competing peptide dialysis, isoform-specific PKC pharmacology, whole-cell patch-clamp in tsA201 cells\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis identifying specific phosphorylation site plus peptide competition and isoform pharmacology\",\n      \"pmids\": [\"16973824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CaBP1, a calmodulin-like Ca²⁺-binding protein, blunts Ca²⁺-dependent inactivation (CDI) of CaV1.3 by interacting with calmodulin-binding sequences in the CaV1.3 α1 subunit; CaBP1 is strongly localized at presynaptic ribbon synapses of adult IHCs and is implicated in conferring anomalously slow CDI required for auditory transmission. CaBP4 interacts with the same sequences but suppresses CDI less efficiently.\",\n      \"method\": \"Co-immunoprecipitation, heterologous expression with patch-clamp, immunolocalization in IHCs, CaBP4-/- mice\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding, functional electrophysiology, genetic KO control; multiple orthogonal methods\",\n      \"pmids\": [\"17947313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CaV1.3 and RyR2 physically interact via the CaV1.3 N-terminus (identified by yeast two-hybrid and confirmed by co-immunoprecipitation) in rat hippocampus; depolarization activating L-type Ca²⁺ channels triggers RyR2-dependent Ca²⁺ release even without extracellular Ca²⁺, and this effect is blocked by siRNA silencing of CaV1.3.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, immunocytochemistry, siRNA knockdown, Ca²⁺ imaging in hippocampal neurons\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — yeast two-hybrid plus co-IP plus siRNA functional validation; multiple orthogonal methods\",\n      \"pmids\": [\"17823125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Alternative splicing in the CaV1.3 C-terminus generates long (CaV1.3₄₂) and short (CaV1.3₄₂A) forms; the long form contains a C-terminal modulatory domain (CTM) whose removal (short form or CaV1.3ΔC116 truncation) shifts activation to more negative voltages and enhances Ca²⁺-dependent inactivation. FRET experiments confirm intramolecular C-terminal protein interaction that modulates calmodulin binding to the IQ domain.\",\n      \"method\": \"Heterologous expression in HEK-293 cells, whole-cell patch-clamp, FRET, truncation/deletion constructs, co-expression of C-terminal peptide\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution of modular domain, FRET structural validation, mutagenesis/truncation; replicated by subsequent studies\",\n      \"pmids\": [\"18482979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The otoferlin C2D domain directly binds the CaV1.3 II-III loop in a Ca²⁺-dependent manner; the deafness-causing mutation L1011P in C2D renders this interaction Ca²⁺-insensitive and greatly reduced, while the C2F domain binds syntaxin 1A and SNAP-25, defining otoferlin as a molecular link between the Ca²⁺ channel and the SNARE complex at IHC synapses.\",\n      \"method\": \"Fusion protein pull-down with disease-associated mutants, Ca²⁺-dependent binding assays, Kd measurements\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with mutagenesis of disease variants; rigorous biochemical characterization\",\n      \"pmids\": [\"19004828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Whirlin (USH2D protein) specifically interacts with CaV1.3 via PDZ domain binding (confirmed by yeast two-hybrid, GST pull-down, co-immunoprecipitation); CaV1.3 and whirlin co-localize at the connecting cilium and photoreceptor synapse in adult retina, integrating CaV1.3 into the Usher protein network.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, immunofluorescence and immunoelectron microscopy in retina\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — three orthogonal biochemical binding assays plus in vivo co-localization\",\n      \"pmids\": [\"19959638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CaV1.3 undergoes Ca²⁺-dependent facilitation (CDF) only when densin and CaMKII are co-expressed together; facilitation requires Ca²⁺, CaMKII activation, CaMKII–densin association, and densin binding to the CaV1.3 α1 C-terminal domain. CaV1.3, densin, and CaMKII form a complex in brain and co-localize at dendritic spines.\",\n      \"method\": \"Heterologous expression in HEK293T cells, co-immunoprecipitation from brain, patch-clamp, dominant-negative CaMKII\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — biochemical complex identification plus functional electrophysiology with multiple genetic/pharmacological controls; multiple orthogonal methods\",\n      \"pmids\": [\"20392935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CaV1.3 directly associates with GABABR2 via yeast two-hybrid, GST pull-down, and co-immunoprecipitation; GABAB receptor activation increases CaV1.3 (but not CaV1.2) currents and intracellular Ca²⁺, demonstrating subtype-specific functional coupling between GABABR and CaV1.3.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, patch-clamp, Ca²⁺ imaging in HEK293 and hippocampal neurons\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — three orthogonal binding assays plus functional validation; single lab\",\n      \"pmids\": [\"20627102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RIM2α binds to the β-subunit of the CaV1.3 channel complex, co-localizes with CaV1.3 at IHC presynaptic active zones, and slows both Ca²⁺-dependent and voltage-dependent inactivation of CaV1.3 channels, generating a non-inactivating current component characteristic of IHC CaV1.3 currents.\",\n      \"method\": \"Co-localization in IHCs, heterologous expression in tsA-201 cells, patch-clamp\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional electrophysiology with binding evidence and localization; single lab\",\n      \"pmids\": [\"20363327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Loss of function of CACNA1D in humans (insertion of glycine causing non-conducting channels with abnormal voltage-dependent gating) causes SANDD syndrome (sinoatrial node dysfunction and deafness), establishing that CaV1.3 is required for human SAN pacemaking and auditory hair cell function.\",\n      \"method\": \"Positional cloning, Sanger sequencing, heterologous expression with patch-clamp of mutant channels\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human channelopathy identified by positional cloning with functional electrophysiological validation of mechanism; highly cited\",\n      \"pmids\": [\"21131953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Harmonin, a PDZ-domain scaffolding protein required for mechanosensory function, associates with CaV1.3 at IHC presynapses and limits CaV1.3 channel surface availability through a ubiquitin-dependent degradation pathway.\",\n      \"method\": \"Co-immunoprecipitation at IHC synapse, ubiquitin pathway assay, immunofluorescence\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — biochemical interaction confirmed at native synapse with defined ubiquitin mechanism\",\n      \"pmids\": [\"21822269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The C-terminus of CaV1.3 translocates to the nucleus in atrial myocytes in a Ca²⁺-dependent manner, where it functions as a transcriptional regulator to modulate SK2 channel expression; CaV1.3 null mice show decreased myosin light chain 2 protein, which interacts with SK2 to regulate its membrane localization.\",\n      \"method\": \"Nuclear fractionation, CaV1.3-/- mouse model, Western blot, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — subcellular fractionation plus KO validation; single lab, novel mechanism\",\n      \"pmids\": [\"25538241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Zebrafish CaV1.3a channels regulate synaptic ribbon size in hair cells: genetic disruption or acute pharmacological block enlarges ribbons, while channel activation reduces ribbon size and intact synapses. Ca²⁺ influx through CaV1.3a is required for synaptic maintenance; effects are not due to loss of neurotransmission.\",\n      \"method\": \"In vivo Ca²⁺ imaging, confocal and super-resolution microscopy, genetic mutants, pharmacological manipulation, vglut3 mutant controls in zebrafish\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic and pharmacological dissection with super-resolution imaging; ortholog in zebrafish; multiple controls\",\n      \"pmids\": [\"23197719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CaV1.3 channels in the sinoatrial node co-localize with ryanodine receptors in sarcomeric structures (while CaV1.2 is restricted to delimiting membrane); CaV1.3 undergoes stronger voltage-dependent facilitation (VDF) than CaV1.2 during recovery from inactivation, which enhances pacemaker recovery after pauses via preferential coupling to RyR-mediated Ca²⁺ release.\",\n      \"method\": \"Patch-clamp with DHP-insensitive CaV1.2 knock-in mice to isolate channel-specific currents, immunofluorescence co-localization, computational modeling\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knock-in model to isolate CaV1.3 current, immunolocalization, and modeling; multiple orthogonal approaches\",\n      \"pmids\": [\"23045342\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Somatic mutations altering Gly403 or Ile770 in the S6 pore-lining segments of CACNA1D cause gain-of-function in aldosterone-producing adenomas: Gly403 mutations shift activation to less depolarized potentials and impair inactivation; both lead to increased Ca²⁺ influx driving aldosterone production. Identical positions mutated as germline de novo cause primary aldosteronism with neuromuscular abnormalities.\",\n      \"method\": \"Whole-exome sequencing, heterologous expression of mutant channels, whole-cell patch-clamp in tsA-201 cells\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — structure-function with mutants expressed and electrophysiologically characterized; landmark paper, 471 citations\",\n      \"pmids\": [\"23913001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RNA editing by ADAR2 at the IQ domain of CaV1.3 (within exon 41) reduces Ca²⁺-dependent inactivation (CDI) by weakening prebinding of Ca²⁺-free calmodulin (apoCaM) to the channel rather than attenuating Ca²⁺/CaM binding; this makes CDI continuously tunable by fluctuations in ambient calmodulin levels, an effect confirmed in substantia nigral neurons.\",\n      \"method\": \"Heterologous expression with RNA-edited channels, patch-clamp, calmodulin titration, recordings from substantia nigra neurons\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mechanistic dissection via edited channel variants, calmodulin titration, and native neuron validation; multiple orthogonal methods\",\n      \"pmids\": [\"24120865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Harmonin binding to the CaV1.3 α1 distal C-terminus (dCT) enhances voltage-dependent facilitation (VDF) of CaV1.3 currents in HEK293T cells and in mouse IHCs; dfcr harmonin mutant that cannot bind α1 dCT fails to promote VDF and reduces synchronous exocytosis in mature IHCs, demonstrating a multifaceted presynaptic role of harmonin in regulating CaV1.3 and exocytosis.\",\n      \"method\": \"Heterologous expression with mutant harmonin variants, patch-clamp, membrane capacitance recordings in IHCs from dfcr mice\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic mouse model with domain-specific mutations, functional electrophysiology in native cells; multiple orthogonal methods\",\n      \"pmids\": [\"23613530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"De novo CACNA1D mutations p.A749G and p.G407R in autism spectrum disorder patients cause gain-of-function: p.A749G shifts voltage-dependence of activation and inactivation ~15 mV negative; p.G407R markedly slows current inactivation; both increase Ca²⁺ influx through CaV1.3.\",\n      \"method\": \"Whole-cell patch-clamp of mutant channels expressed in tsA-201 cells\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct electrophysiological characterization of disease mutations in heterologous system\",\n      \"pmids\": [\"25620733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The C-terminal modulatory domain (CTM) controls coupling of voltage-sensor movement to pore opening in CaV1.3: the CTM weakens this coupling so that a greater fraction of charge must move before channel opening; removal of CTM (short splice variant CaV1.3₄₂A) enhances coupling efficiency, shifting activation ~7.2 mV negative without affecting voltage-sensor charge movement.\",\n      \"method\": \"Gating current measurement (QON-V) and ionic current recording in tsA-201 cells expressing long and short CaV1.3 splice variants\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — biophysical dissection of voltage-sensor vs. gate coupling using gating currents; clean mechanistic study\",\n      \"pmids\": [\"24703308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RIM2α and RIM2β are expressed at IHC active zones and promote clustering of CaV1.3 channels; RIM2α-deficient IHCs have fewer synaptic CaV1.3 channels (confirmed by superresolution microscopy), reduced Ca²⁺ influx, and proportionally reduced exocytosis; RIM2 binds the channel β-subunit.\",\n      \"method\": \"Immunofluorescence, superresolution microscopy, patch-clamp fluctuation analysis, Ca²⁺ imaging, electron tomography, hair cell-specific conditional KO\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO, superresolution imaging, biophysical fluctuation analysis, electron tomography; multiple rigorous methods\",\n      \"pmids\": [\"26034270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In substantia nigra dopamine neurons, Cav1.3 L-type Ca²⁺ channel activity, together with internal Ca²⁺ and the neuronal calcium sensor NCS-1, is required for sensitization of D2-autoreceptor responses; Cav1.3 activity promotes NCS-1 interaction with D2 receptors, modulating inhibitory GIRK2-mediated feedback. This pathway is also active in human SN DA neurons and is altered in Parkinson's disease.\",\n      \"method\": \"Electrophysiology in brain slices from Cav1.3 KO and WT mice, pharmacological tools, in vivo manipulation with l-DOPA/cocaine, mRNA analysis of human SN neurons\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO plus pharmacological dissection in native neurons, human data; multiple orthogonal methods\",\n      \"pmids\": [\"24934288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The cell-type-specific function of the CaV1.3 C-terminal modulatory domain (CTM) differs between IHCs and chromaffin cells: CTM disruption impairs Ca²⁺-dependent inactivation in IHCs but increases it in chromaffin cells, causing hyperpolarized resting potential and reduced pacemaking in chromaffin cells.\",\n      \"method\": \"Knock-in mice with HA tag disrupting CTM, patch-clamp in IHCs and chromaffin cells, hearing threshold measurement\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo knock-in model with cell-type-specific electrophysiology; multiple cell types compared\",\n      \"pmids\": [\"26379493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Cav1.3 channels provide Ca²⁺ influx during diastolic depolarization in SAN cells that triggers local RyR-dependent Ca²⁺ release events; Cav1.3-/- SAN cells show reduced frequency and impaired synchronization of local Ca²⁺ release, preventing Ca²⁺ transient generation and spontaneous activity. Caffeine-stimulated Ca²⁺-induced Ca²⁺ release rescues pacemaking in Cav1.3-/- cells.\",\n      \"method\": \"Ca²⁺ imaging in isolated SAN cells and ex vivo preparations from Cav1.3-/- and WT mice, action potential voltage-clamp commands, caffeine rescue experiments\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with live Ca²⁺ imaging and rescue experiments; multiple orthogonal methods\",\n      \"pmids\": [\"26786159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The α2δ2 auxiliary subunit co-assembles with CaV1.3 at IHC presynapses; ducky (α2δ2-null) mice show 30-40% reduction of CaV1.3 Ca²⁺ and Ba²⁺ currents with altered gating, reduced exocytosis proportional to reduced Ca²⁺ influx, and impaired trans-synaptic alignment between presynaptic CaV1.3 clusters and postsynaptic AMPA receptor/PSD-95 clusters.\",\n      \"method\": \"Patch-clamp, immunofluorescence, Ca²⁺ imaging in ducky null mouse IHCs\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic null model with electrophysiology, immunolocalization, and trans-synaptic analysis; multiple methods\",\n      \"pmids\": [\"27798183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"De novo CACNA1D mutation V401L (in the activation gate) causes gain-of-function in a patient with ASD and epilepsy: significantly increases current density, shifts activation and inactivation to more negative voltages, and reduces inactivation in both long and short CaV1.3 splice variants; mutant channels retain full sensitivity to isradipine.\",\n      \"method\": \"Whole-cell patch-clamp of V401L mutant channels expressed in tsA-201 cells, both splice variants tested\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct electrophysiological characterization with both splice variants; disease variant with mechanistic characterization\",\n      \"pmids\": [\"28472301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Brain-selective RNA editing of CaV1.3 transcripts is restricted to neurons by splicing factor SRSF9, which inhibits ADAR2-mediated editing. Mechanistically, SRSF9 directly binds the RNA duplex required for editing (formed between exon 41 and an intronic editing-site complementary sequence), and selective down-regulation of SRSF9 in neurons enables neuron-specific CaV1.3 editing.\",\n      \"method\": \"Minigene editing assay with ADAR2 and SRSF9, CLIP/RIP to demonstrate direct RNA binding, SRSF9 knockdown/overexpression\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mechanistic dissection with reconstitution (minigene), direct RNA binding demonstration, and functional modulation\",\n      \"pmids\": [\"29733375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"An autism-associated de novo mutation A760G (equivalent to A749G in another numbering) severely diminishes Ca²⁺-dependent inactivation (CDI) of CaV1.3 by enhancing channel opening within the Ca²⁺-inactivated mode; simultaneously, A760G increases voltage-dependent inactivation (VDI), creating opposing regulatory effects that together increase intracellular Ca²⁺.\",\n      \"method\": \"Whole-cell patch-clamp of mutant channels, allosteric gating model analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct biophysical characterization with mechanistic modeling\",\n      \"pmids\": [\"27255217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CACNA1D gain-of-function mutation S652L shifts voltage-dependence of activation and steady-state inactivation ~13-17 mV negative, increases window currents at subthreshold voltages, slows tail currents, and increases Ca²⁺ during AP-like stimuli; it also increases sensitivity to isradipine 3-4-fold. The contrasting loss-of-function S652W mutation shifts gating positive, confirming that only gain-of-function variants confer high disease risk.\",\n      \"method\": \"Whole-cell patch-clamp of mutant and wild-type CaV1.3 in tsA-201 cells, isradipine dose-response\",\n      \"journal\": \"Molecular autism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — comparative mutagenesis (GOF vs LOF at same site) with AP-clamp and pharmacological validation\",\n      \"pmids\": [\"31921405\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CACNA1D encodes the pore-forming α1D subunit of the CaV1.3 L-type Ca²⁺ channel, which activates at uniquely negative voltages (controlled by C-terminal splice variants and RNA editing that modulate CTM-dependent coupling of voltage sensing to pore opening), undergoes Ca²⁺-dependent inactivation regulated by calmodulin and CaBPs at the IQ/EF-hand domains, is phosphorylated by PKA (potentiating, at unspecified sites), PKC-βII/ε (inhibitory, at N-terminal S81), and CaMKII (facilitating via EF-hand S1486); it clusters at postsynaptic densities and presynaptic ribbon active zones through PDZ interactions with Shank and harmonin (the latter also promoting ubiquitin-dependent degradation), is scaffolded with RIM2α/β (which stabilize channel abundance at hair cell active zones), physically couples to RyR2 and GABABR2 for intracellular Ca²⁺ amplification and neuromodulation, and is regulated by the auxiliary α2δ2 subunit and RIM2 for trans-synaptic organization; gain-of-function mutations in S6 pore-lining segments cause aldosterone-producing adenomas, primary aldosteronism, autism spectrum disorder, and congenital hyperinsulinism, while loss-of-function causes SANDD syndrome (sinoatrial node dysfunction and deafness).\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CACNA1D encodes the pore-forming α1D subunit of the CaV1.3 L-type voltage-gated Ca²⁺ channel, which activates at uniquely negative membrane potentials and is essential for cardiac pacemaking, auditory hair cell synaptic transmission, and neuroendocrine signaling. Channel gating is tuned by C-terminal alternative splicing that controls a modulatory domain (CTM) regulating voltage-sensor–to–pore coupling [PMID:18482979, PMID:24703308], by ADAR2-mediated RNA editing at the IQ domain that modulates calmodulin-dependent inactivation [PMID:24120865, PMID:29733375], and by phosphorylation through PKA (potentiating), PKC-βII/ε (inhibitory at N-terminal S81), and CaMKII (facilitating at EF-hand S1486) [PMID:15615842, PMID:16973824, PMID:16763033]. CaV1.3 is organized at presynaptic ribbon active zones and postsynaptic densities through scaffolding interactions with Shank, harmonin, RIM2α/β, and the auxiliary α₂δ2 subunit, which together govern channel clustering, surface stability, trans-synaptic alignment, and coupling to vesicle release and RyR2-mediated Ca²⁺-induced Ca²⁺ release [PMID:15689539, PMID:21822269, PMID:26034270, PMID:27798183, PMID:17823125]. Loss-of-function mutations cause SANDD syndrome (sinoatrial node dysfunction and deafness) [PMID:21131953], while gain-of-function mutations in S6 pore-lining segments cause aldosterone-producing adenomas, primary aldosteronism, and autism spectrum disorder with epilepsy [PMID:23913001, PMID:25620733, PMID:28472301].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Establishing that CaV1.3 activates at uniquely negative voltages distinguished it from CaV1.2 and explained how L-type channels could operate at subthreshold potentials in pacemaker and sensory cells.\",\n      \"evidence\": \"Whole-cell patch-clamp and radioligand binding of exon 8A splice variant in tsA-201 cells\",\n      \"pmids\": [\"11285265\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of negative activation threshold not yet mapped to specific structural domains\", \"In vivo splice variant distribution unknown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrating PKC-dependent stimulation of CaV1.3 by Gi/Go-coupled GPCRs revealed a GPCR modulatory pathway distinct from CaV2.2 inhibition.\",\n      \"evidence\": \"Pharmacological dissection in Xenopus oocyte expression system\",\n      \"pmids\": [\"11435619\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"PKC phosphorylation site not identified in this study\", \"Not confirmed in native neuroendocrine cells\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Genetic knockout established that CaV1.3 is essential for both cardiac pacemaker diastolic depolarization and cochlear inner hair cell exocytosis, defining its two principal physiological roles.\",\n      \"evidence\": \"CaV1.3−/− mice with patch-clamp of SAN cells and IHC capacitance measurements\",\n      \"pmids\": [\"12700358\", \"14645476\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular identity of CaV1.3 coupling partners at IHC active zones unknown\", \"Contribution of other channel types to residual pacemaking not fully resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Quantification of CaV1.3 clustering at ribbon active zones and demonstration of nanodomain Ca²⁺ coupling to vesicle release established the biophysical framework for how few channels drive transmitter release at auditory synapses.\",\n      \"evidence\": \"Nonstationary fluctuation analysis, immunohistochemistry, and capacitance recordings in IHCs\",\n      \"pmids\": [\"16354915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the molecular tether linking CaV1.3 to release sites unknown\", \"Single-channel properties in native IHCs not directly measured\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identification of Shank as a PDZ-domain scaffold that clusters CaV1.3 at synapses and enables GPCR modulation resolved how CaV1.3 is positioned in postsynaptic signaling complexes.\",\n      \"evidence\": \"Yeast two-hybrid, pull-down, dominant-negative peptides in hippocampal neurons; D2/M1 receptor modulation requiring Shank–Homer in striatal neurons from CaV1.3 KO mice\",\n      \"pmids\": [\"15689539\", \"15689540\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Shank interaction stoichiometry unknown\", \"Whether Shank mediates CaV1.3 clustering at all synapse types untested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Mapping specific kinase phosphorylation sites—CaMKII at S1486 (facilitating) and PKC-βII/ε at S81 (inhibitory)—and PKA-dependent potentiation defined the phosphoregulatory landscape of CaV1.3.\",\n      \"evidence\": \"Site-directed mutagenesis, phosphomimetic constructs, isoform-specific pharmacology, and patch-clamp in tsA-201 and cortical neurons\",\n      \"pmids\": [\"16763033\", \"16973824\", \"15615842\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PKA phosphorylation site on α1D not identified\", \"In vivo relevance of each phosphorylation event not established\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Discovery that CaBP1 suppresses Ca²⁺-dependent inactivation at IHC ribbon synapses and that CaV1.3 physically couples to RyR2 for voltage-triggered intracellular Ca²⁺ release expanded the Ca²⁺-sensing and amplification machinery associated with CaV1.3.\",\n      \"evidence\": \"Co-immunoprecipitation, heterologous electrophysiology, yeast two-hybrid, siRNA knockdown in hippocampal neurons, IHC immunolocalization\",\n      \"pmids\": [\"17947313\", \"17823125\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"CaBP1 binding site on CaV1.3 not mapped at residue level\", \"Stoichiometry of CaV1.3–RyR2 coupling complex unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identification of the C-terminal modulatory domain (CTM) as an intramolecular brake that weakens calmodulin binding and shifts activation positive revealed how alternative C-terminal splicing tunes CaV1.3 gating.\",\n      \"evidence\": \"FRET, truncation constructs, and patch-clamp of long vs. short splice variants in HEK-293 cells\",\n      \"pmids\": [\"18482979\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"CTM structural basis at atomic level unresolved\", \"Relative expression of long vs. short splice variants across tissues not systematically mapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstration that otoferlin C2D domain binds the CaV1.3 II–III loop in a Ca²⁺-dependent manner, disrupted by the deafness mutation L1011P, established the molecular link between the Ca²⁺ channel and the SNARE-associated release machinery at IHC synapses.\",\n      \"evidence\": \"Fusion protein pull-down with disease mutants and Ca²⁺-dependent binding assays\",\n      \"pmids\": [\"19004828\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of disrupting this interaction on exocytosis not directly tested in this study\", \"Whether otoferlin replaces synaptotagmin function entirely at IHC synapses not resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Discovery that SANDD syndrome results from a loss-of-function CACNA1D mutation proved CaV1.3 is indispensable for human sinoatrial pacemaking and hearing, translating mouse knockout findings to human disease.\",\n      \"evidence\": \"Positional cloning in consanguineous family, Sanger sequencing, heterologous expression of mutant channels with patch-clamp\",\n      \"pmids\": [\"21131953\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Prevalence of CACNA1D loss-of-function variants in unexplained bradycardia or deafness not established\", \"No rescue or gene therapy attempted\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identification of densin–CaMKII complex as required for Ca²⁺-dependent facilitation, RIM2α/β as modulators of inactivation and channel clustering, and GABABR2 as a direct binding partner expanded the macromolecular signaling complex at CaV1.3-containing synapses.\",\n      \"evidence\": \"Co-immunoprecipitation from brain, heterologous electrophysiology, co-localization in IHCs, yeast two-hybrid and GST pull-down for GABABR2\",\n      \"pmids\": [\"20392935\", \"20363327\", \"20627102\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"GABABR2–CaV1.3 interaction confirmed in single lab\", \"Structural basis for RIM2–β-subunit interaction unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showing that harmonin promotes ubiquitin-dependent degradation of CaV1.3 while also enhancing voltage-dependent facilitation revealed a dual scaffolding/quality-control mechanism at IHC presynapses.\",\n      \"evidence\": \"Co-immunoprecipitation at native IHC synapse, ubiquitin assay, and electrophysiology in dfcr harmonin mutant mice\",\n      \"pmids\": [\"21822269\", \"23613530\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase responsible for CaV1.3 ubiquitination not identified\", \"Whether harmonin-mediated degradation is activity-dependent unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Discovery that somatic CACNA1D gain-of-function mutations in S6 segments cause aldosterone-producing adenomas established CaV1.3 as a driver of autonomous aldosterone secretion and primary aldosteronism.\",\n      \"evidence\": \"Whole-exome sequencing of adenomas, heterologous expression and patch-clamp of G403R and I770M mutants\",\n      \"pmids\": [\"23913001\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Frequency of CACNA1D mutations across all aldosterone-producing adenomas not fully defined\", \"Downstream transcriptional programs activated by mutant CaV1.3 in adrenal cells not mapped\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Elucidation that ADAR2-mediated RNA editing at the IQ domain weakens apoCaM prebinding rather than Ca²⁺/CaM binding established a continuously tunable mechanism for CDI regulation unique to neurons.\",\n      \"evidence\": \"Patch-clamp of edited channel variants with calmodulin titration, substantia nigra neuron recordings\",\n      \"pmids\": [\"24120865\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Editing levels across brain regions and disease states incompletely characterized\", \"Whether editing and CTM splicing interact combinatorially untested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Biophysical demonstration that CTM controls voltage-sensor–to–pore coupling efficiency (not voltage-sensor movement itself) provided a mechanistic explanation for how C-terminal splicing shifts CaV1.3 activation threshold.\",\n      \"evidence\": \"Gating current (QON-V) vs. ionic current recordings of long and short splice variants in tsA-201 cells\",\n      \"pmids\": [\"24703308\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural interaction between CTM and voltage-sensing domains not visualized\", \"Whether CTM coupling mechanism is conserved across CaV1 family unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Characterization of de novo CACNA1D mutations A749G and G407R as gain-of-function in autism spectrum disorder patients linked CaV1.3 hyperactivity to neurodevelopmental disease beyond aldosteronism.\",\n      \"evidence\": \"Whole-cell patch-clamp of mutant channels in tsA-201 cells; patient genotyping\",\n      \"pmids\": [\"25620733\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Circuit-level consequences of gain-of-function in developing brain not modeled\", \"No animal model of these specific mutations\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Conditional knockout and superresolution imaging of RIM2α at IHC active zones demonstrated that RIM proteins stabilize CaV1.3 channel number at release sites and that reduced channel number proportionally reduces exocytosis.\",\n      \"evidence\": \"Hair cell–specific RIM2α conditional KO, STED microscopy, fluctuation analysis, electron tomography\",\n      \"pmids\": [\"26034270\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RIM2 directly tethers CaV1.3 or acts through β-subunit only is unresolved\", \"Role of RIM1 at IHC synapses not addressed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Characterization of the α₂δ2 auxiliary subunit's role in CaV1.3 surface expression, gating, and trans-synaptic alignment with postsynaptic AMPA receptor clusters revealed an organizing function beyond simple current enhancement.\",\n      \"evidence\": \"Patch-clamp, immunofluorescence, and Ca²⁺ imaging in ducky (α₂δ2-null) mouse IHCs\",\n      \"pmids\": [\"27798183\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of trans-synaptic signaling from presynaptic α₂δ2 to postsynaptic PSD-95/AMPA receptors not identified\", \"Whether α₂δ2 similarly organizes CaV1.3 synapses in neurons unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstration that CaV1.3 provides diastolic Ca²⁺ influx that triggers and synchronizes local RyR-dependent Ca²⁺ release events in SAN cells, rescuable by caffeine, refined the coupled-clock pacemaker model by defining CaV1.3 as the voltage-clock input to the Ca²⁺ clock.\",\n      \"evidence\": \"Live Ca²⁺ imaging in CaV1.3−/− and WT SAN cells with caffeine rescue\",\n      \"pmids\": [\"26786159\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatial relationship between CaV1.3 and RyR clusters in SAN not resolved at nanoscale\", \"Contribution of CaV1.3 splice variants to SAN pacemaking not distinguished\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of SRSF9 as the splicing factor that restricts ADAR2-mediated CaV1.3 editing to neurons (by blocking the editing-site RNA duplex in non-neuronal cells) resolved the cell-type specificity of CaV1.3 RNA editing.\",\n      \"evidence\": \"Minigene editing assay, CLIP/RIP for direct SRSF9–RNA binding, SRSF9 knockdown/overexpression\",\n      \"pmids\": [\"29733375\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SRSF9 regulation is dynamic within neurons (e.g., activity-dependent) unknown\", \"Other edited sites in CaV1.3 not examined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Comparative analysis of gain-of-function (S652L) versus loss-of-function (S652W) mutations at the same residue established that only gain-of-function variants confer high disease risk and showed that GOF mutants can paradoxically increase DHP sensitivity, suggesting pharmacological rescue potential.\",\n      \"evidence\": \"Whole-cell patch-clamp with AP-clamp waveforms and isradipine dose-response in tsA-201 cells\",\n      \"pmids\": [\"31921405\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo efficacy of isradipine for GOF CACNA1D channelopathies not tested\", \"Whether increased DHP sensitivity generalizes across GOF mutations unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major open questions include the atomic structure of the CaV1.3 CTM–channel body interaction, the identity of the E3 ubiquitin ligase mediating harmonin-dependent CaV1.3 degradation, the combinatorial effects of RNA editing and C-terminal splicing on native channel behavior, and whether DHP pharmacotherapy can rescue gain-of-function channelopathies in vivo.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of full-length CaV1.3 with CTM\", \"E3 ligase for harmonin-mediated ubiquitination unidentified\", \"In vivo pharmacological rescue of GOF mutations untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 2, 3, 4, 23]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [12, 27]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 4, 5, 28, 32]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [20]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [3, 4, 5, 6, 29]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 6, 7, 9, 16, 29]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 2, 23, 31]},\n      {\"term_id\": \"R-HSA-9709957\", \"supporting_discovery_ids\": [3, 4, 21, 25, 28, 32]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [18, 23, 26, 33, 36]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SHANK1\",\n      \"RIM2\",\n      \"USH1C\",\n      \"RYR2\",\n      \"OTOF\",\n      \"CACNA2D2\",\n      \"CAMK2A\",\n      \"GABBR2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}