{"gene":"CACNA1D","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2001,"finding":"CaV1.3 (α1D) subunits form L-type Ca²⁺ channels that activate at more negative voltages (threshold ~-45.7 mV) and inactivate more slowly than α1C channels; the exon 8A splice variant is required for functional expression, while exon 8B yields no intact protein or current. Radioligand binding showed lower DHP sensitivity is due to voltage-dependence of DHP block rather than reduced affinity for the DHP binding pocket.","method":"Whole-cell patch-clamp of tsA-201 cells expressing cloned human α1D splice variants; radioligand binding experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct electrophysiological reconstitution with radioligand binding, multiple orthogonal methods in a single rigorous study","pmids":["11285265"],"is_preprint":false},{"year":2003,"finding":"Genetic inactivation of Cav1.3 in mice significantly slows sinoatrial node (SAN) pacemaker activity and promotes spontaneous arrhythmia; Cav1.3 contributes a major component of L-type current (ICa,L) activating at negative voltages corresponding to the diastolic depolarization range, demonstrating its essential role in cardiac pacemaking.","method":"Gene-targeted knockout mice; patch-clamp recording of SAN cells; pharmacological dissection of ICa,L","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with clean electrophysiological phenotype, replicated in multiple subsequent studies","pmids":["12700358"],"is_preprint":false},{"year":2003,"finding":"CaV1.3 channels are essential for cochlear inner hair cell (IHC) development and synaptic transmission: CaV1.3-/- IHCs lack Ca²⁺ action potentials, show only marginal depolarization-induced exocytosis (proportional to the residual Ca²⁺ current), retain efferent cholinergic synaptic input beyond normal developmental window, and fail to acquire large-conductance Ca²⁺-activated K⁺ channels, indicating CaV1.3 is required for normal IHC maturation.","method":"Patch-clamp recordings in CaV1.3-/- mouse IHCs; photolysis of caged Ca²⁺; developmental immunohistochemistry","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with multiple orthogonal electrophysiological and developmental phenotypic readouts","pmids":["14645476"],"is_preprint":false},{"year":2005,"finding":"CaV1.3 channels are concentrated at ribbon-type active zones of IHCs (~80 channels per active zone); exocytosis of the readily releasable vesicle pool shows near-unity apparent Ca²⁺ cooperativity when open-channel number is manipulated but high intrinsic cooperativity when single-channel current is varied, indicating nanodomain Ca²⁺ control of exocytosis by few nearby CaV1.3 channels.","method":"Nonstationary fluctuation analysis; immunohistochemistry; membrane capacitance recordings with pharmacological manipulation of Ca²⁺ current","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (fluctuation analysis, IHC, capacitance recordings) in a single focused study","pmids":["16354915"],"is_preprint":false},{"year":2005,"finding":"D2 dopaminergic and M1 muscarinic GPCR modulation of CaV1.3 channels in striatal medium spiny neurons depends on a Shank-binding PDZ domain in the CaV1.3 C-terminus; disruption of the CaV1.3 PDZ–Shank interaction or the Shank–Homer interaction abolishes this GPCR modulation. Shank colocalized with CaV1.3a at spine-like puncta co-expressing PSD-95 and corticostriatal synaptic markers.","method":"Whole-cell patch-clamp; intracellular peptide dialysis to compete PDZ binding; genetic deletion of CaV1.3; immunohistochemistry","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal functional disruption with competing peptides, genetic KO, and co-localization; multiple orthogonal approaches","pmids":["15689540"],"is_preprint":false},{"year":2005,"finding":"CaV1.3a (long C-terminal splice variant) specifically associates with Shank via two distinct interactions: the C-terminal PDZ-binding motif binds the Shank PDZ domain, and the proline-rich region binds the Shank SH3 domain. Shank-binding motifs in CaV1.3a are necessary and sufficient for synaptic clustering of CaV1.3 channels and are required for pCREB signaling in hippocampal neurons.","method":"Yeast two-hybrid screen; in vitro GST pull-down; recombinant epitope-tagged CaV1.3 in hippocampal neurons; dominant-negative peptides; DHP-resistant CaV1.3 mutants","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reconstitution of binding in vitro, yeast two-hybrid, neuronal localization experiments with dominant-negative and mutagenesis controls","pmids":["15689539"],"is_preprint":false},{"year":2006,"finding":"PKA phosphorylation of CaV1.3 α1D at a serine residue (confirmed by 8-Br-cAMP stimulation and PKI inhibition) significantly increases peak CaV1.3 Ca²⁺ current density, identifying PKA as a positive regulator of CaV1.3 channel activity in the sinoatrial node and atria.","method":"Heterologous expression in tsA201 cells; whole-cell patch-clamp; 8-Br-cAMP; PKA inhibitor PKI; Western blot phosphorylation assay","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology combined with biochemical phosphorylation in a single lab","pmids":["15615842"],"is_preprint":false},{"year":2006,"finding":"PKC inhibits CaV1.3 Ca²⁺ channel activity through phosphorylation of serine 81 in the N-terminal domain; a S81D phosphomimetic mutation recapitulates PKC inhibition, a competing peptide spanning S81 prevents it, and only βII- and ε-PKC isozymes mediate this regulation.","method":"Site-directed mutagenesis (S81D); competing N-terminal peptide dialysis; isozyme-selective PKC activators; whole-cell patch-clamp in heterologous expression","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis with phosphomimetic, competing peptide, and isozyme specificity; multiple orthogonal methods in one study","pmids":["16973824"],"is_preprint":false},{"year":2006,"finding":"IGF-1 potentiates CaV1.3 channels via a signaling pathway requiring PLC, Ca²⁺ release from IP3-sensitive stores, and CaMKII phosphorylation of serine S1486 in the EF-hand motif of the CaV1.3 α1 subunit; this causes a left-shift in the I-V relationship and potentiates CREB phosphorylation.","method":"Site-directed mutagenesis (S1486A); pharmacological inhibitors of PLC, IP3R, CaMKII; whole-cell patch-clamp; pCREB immunofluorescence in cortical/hippocampal neurons","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis of identified phosphorylation site combined with pathway pharmacology and functional readouts in multiple cell types","pmids":["16763033"],"is_preprint":false},{"year":2007,"finding":"The N-terminus of CaV1.3 α1 subunit physically interacts with the N-terminal region of ryanodine receptor type 2 (RyR2); this complex is co-immunoprecipitated from hippocampal tissue, and CaV1.3 activation triggers RyR-dependent Ca²⁺ release and upregulates RyR2 mRNA; siRNA silencing of CaV1.3 blocks both acute and long-term effects on RyR.","method":"Yeast two-hybrid; co-immunoprecipitation from rat hippocampus; immunocytochemistry; siRNA knockdown; KCl depolarization assay; RT-PCR","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP from native tissue combined with functional siRNA knockdown, single lab","pmids":["17823125"],"is_preprint":false},{"year":2007,"finding":"CaBP1, a Ca²⁺-binding protein, most efficiently suppresses Ca²⁺-dependent inactivation (CDI) of CaV1.3 channels in transfected cells by interacting with calmodulin-binding sequences in CaV1.3; CaBP1 is strongly localized at the presynaptic ribbon synapse of adult IHCs and is implicated in conferring the anomalously slow CDI of CaV1.3 currents required for auditory transmission.","method":"Whole-cell patch-clamp in transfected cells and IHCs from CaBP4-/- mice; immunolocalization; binding assay","journal":"The Journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology in native cells combined with knockout mice and co-localization, single lab","pmids":["17947313"],"is_preprint":false},{"year":2008,"finding":"Alternative splicing of the CaV1.3 C-terminus generates long (CaV1.3_42) and short (CaV1.3_42A) variants; the short form activates at more negative voltages and shows enhanced CDI. The last 116 aa of the C-terminus constitutes a C-terminal modulatory domain (CTM); co-expression of the CTM peptide reverts short-form gating. FRET experiments confirmed an intramolecular interaction within the C-terminus that also modulates calmodulin binding.","method":"Patch-clamp of HEK-293 cells; channel truncations; co-expression of CTM peptide; FRET experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — functional reconstitution with truncations, peptide rescue, and FRET structural validation in a single rigorous study","pmids":["18482979"],"is_preprint":false},{"year":2008,"finding":"Otoferlin C2D domain binds the CaV1.3 II-III intracellular loop in a Ca²⁺-dependent manner; the DFNB9 deafness mutation L1011P in C2D renders this binding Ca²⁺-insensitive and greatly diminished, implicating CaV1.3–otoferlin interaction in regulation of hair cell synaptic exocytosis.","method":"GST pull-down with fusion proteins containing DFNB9 mutations; Ca²⁺-dependent binding assays; Kd determination","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro binding with mutagenesis, Ca²⁺ dependency, and disease-mutation validation; single lab","pmids":["19004828"],"is_preprint":false},{"year":2010,"finding":"Loss-of-function CACNA1D mutation (glycine insertion in a conserved alternatively spliced region near the channel pore) results in non-conducting CaV1.3 channels with abnormal voltage-dependent gating, causing SANDD syndrome (sinoatrial node dysfunction and deafness) in humans, closely resembling the Cacna1d-/- mouse phenotype.","method":"Positional cloning; heterologous expression of mutant channel with patch-clamp recordings","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — human genetics with functional characterization of mutant channel in expression system, phenotype matching KO mouse","pmids":["21131953"],"is_preprint":false},{"year":2010,"finding":"Densin is required for Ca²⁺-dependent facilitation of CaV1.3 channels: neither CaMKII nor densin alone affects CaV1.3, but together they augment CaV1.3 Ca²⁺ currents during repetitive stimuli; facilitation requires CaMKII activation and its association with densin, as well as densin binding to the CaV1.3 α1 subunit C-terminal domain. CaV1.3, densin, and CaMKII form a complex in brain.","method":"Co-immunoprecipitation from brain; transfection in HEK293T cells; patch-clamp; dominant-negative CaMKII; binding domain mapping","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP from brain tissue, electrophysiological reconstitution, domain mapping; multiple orthogonal methods","pmids":["20392935"],"is_preprint":false},{"year":2010,"finding":"RIM2α protein co-localizes with CaV1.3 at the presynaptic compartment of cochlear IHCs; RIM proteins bind the β-subunit of the CaV1.3 channel complex and slow both Ca²⁺- and voltage-dependent inactivation, generating a non-inactivating window current characteristic of IHC CaV1.3 currents.","method":"Co-localization immunofluorescence; heterologous expression with patch-clamp in tsA-201 cells","journal":"Molecular and cellular neurosciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiological reconstitution with co-localization, single lab, interaction inferred via β-subunit binding","pmids":["20363327"],"is_preprint":false},{"year":2011,"finding":"Harmonin, a scaffolding protein at the IHC presynapse, interacts with CaV1.3 and limits channel availability through a ubiquitin-dependent proteosomal degradation pathway.","method":"Co-immunoprecipitation; immunolocalization at IHC presynapse; ubiquitin pathway assay","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct biochemical interaction with defined mechanistic pathway (ubiquitin-dependent degradation) published in high-impact journal","pmids":["21822269"],"is_preprint":false},{"year":2011,"finding":"Alternative splicing at four loci in the CaV1.3 C-terminus (exons 41, 43, 44, 48) modulates channel electrophysiological properties: splicing of exon 41 removes the IQ motif causing diminished inactivation; exon 43 splicing causes a frameshift with robust inactivation; exons 44 and 48 alter interaction of the distal modulator with the IQ domain, tapering inactivation.","method":"Transcript-scanning; splice-variant-specific antibodies for localization; patch-clamp of HEK cells expressing each variant","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional characterization of multiple splice variants with electrophysiology, single lab","pmids":["21998309"],"is_preprint":false},{"year":2012,"finding":"Presynaptic CaV1.3 activity regulates synaptic ribbon size in zebrafish hair cells: genetic disruption or acute pharmacological block of CaV1.3a causes ribbon enlargement, while channel activation reduces ribbon size and the number of intact synapses. Ca²⁺ influx through CaV1.3 is required for synaptic maintenance (independent of neurotransmission).","method":"In vivo Ca²⁺ imaging; confocal and super-resolution microscopy; pharmacological block/activation; vglut3 mutant controls","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacological dissection with high-resolution imaging, zebrafish model, single lab","pmids":["23197719"],"is_preprint":false},{"year":2013,"finding":"Somatic gain-of-function mutations at Gly403 (four variants) and Ile770 in CaV1.3 cause aldosterone-producing adenomas by shifting channel activation to less depolarized potentials; Gly403 alterations additionally impair channel inactivation. De novo germline mutations at identical positions cause primary aldosteronism with neuromuscular abnormalities.","method":"Somatic/germline mutation identification; electrophysiological characterization of mutant channels expressed in heterologous cells","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional characterization of multiple patient-derived mutations across independent cases","pmids":["23913001"],"is_preprint":false},{"year":2013,"finding":"RNA editing of the CaV1.3 IQ domain (by ADAR) reduces Ca²⁺-dependent inactivation (CDI) not by weakening Ca²⁺/CaM binding to the edited IQ domain, but by weakening the pre-binding of Ca²⁺-free CaM (apoCaM) to the channel, thereby making CDI continuously tunable by ambient CaM levels.","method":"Electrophysiology of edited vs. unedited CaV1.3 in HEK cells; CaM binding assays; experiments in substantia nigra neurons","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mechanistic dissection of editing effect with binding assays and electrophysiology, validated in native neurons","pmids":["24120865"],"is_preprint":false},{"year":2013,"finding":"CaV1.3 α1D interacts with GABAB receptor subunit 2 (GABABR2): CaV1.3-NT associates with GABABR2-CT, they co-localize in HEK293 cells and hippocampal neurons, and GABABR activation selectively increases CaV1.3 currents and intracellular Ca²⁺ via CaV1.3 but not CaV1.2.","method":"Yeast two-hybrid; GST pull-down; co-immunoprecipitation; co-localization immunofluorescence; patch-clamp; Ca²⁺ imaging","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple binding methods plus functional demonstration; single lab","pmids":["20627102"],"is_preprint":false},{"year":2013,"finding":"Harmonin binding to the CaV1.3 α1 subunit distal C-terminus (dCT) enhances voltage-dependent facilitation (VDF) of CaV1.3 currents and promotes synchronous exocytosis in IHCs; the deaf-circler dfcr harmonin mutant, which does not interact with the α1.3 dCT, has reduced VDF and impaired synchronous exocytosis.","method":"Patch-clamp of HEK293T cells and mouse IHCs from dfcr mice; membrane capacitance recordings; domain deletion analysis","journal":"The Journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — interaction domain mapping with physiological validation in IHCs, single lab","pmids":["23613530"],"is_preprint":false},{"year":2014,"finding":"De novo CaV1.3 mutations p.A749G and p.G407R found in autism spectrum disorder patients cause gain-of-function: p.A749G shifts voltage dependence of activation and inactivation ~15 mV to more negative voltages; p.G407R markedly slows current inactivation. Both are compatible with enhanced Ca²⁺ influx.","method":"Whole-cell patch-clamp of tsA-201 cells expressing patient-derived mutant channel complexes","journal":"Biological psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct electrophysiological characterization of two independent patient mutations in heterologous expression, single lab","pmids":["25620733"],"is_preprint":false},{"year":2014,"finding":"The C-terminal domain of CaV1.3 translocates to the nucleus in a Ca²⁺-dependent manner, where it functions as a transcriptional regulator modulating SK2 channel expression; ablation of CaV1.3 decreases myosin light chain 2 protein, which interacts with and increases membrane localization of SK2 channels.","method":"CaV1.3 null mutant mouse; nuclear fractionation; transcriptional reporter assays; co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional KO combined with fractionation and co-IP, single lab","pmids":["25538241"],"is_preprint":false},{"year":2014,"finding":"The C-terminal modulatory domain (CTM) of CaV1.3 controls coupling efficiency between voltage-sensor charge movement and pore opening: short variants lacking the CTM show stronger coupling, shifting ICa-V ~7.2 mV negative without altering charge movement (QON-V), demonstrating the CTM weakens voltage-sensor-to-gate coupling.","method":"Whole-cell patch-clamp measuring both gating currents (QON-V) and ionic currents (ICa-V) in tsA-201 cells expressing long and short CaV1.3 splice variants","journal":"Biophysical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — simultaneous gating current and ionic current measurements with defined splice variants, clear mechanistic dissection","pmids":["24703308"],"is_preprint":false},{"year":2015,"finding":"RIM2α and RIM2β promote the abundance of CaV1.3 Ca²⁺ channels at inner hair cell active zones: RIM2α-deficient IHCs cluster fewer synaptic CaV1.3 channels (shown by superresolution microscopy), have reduced Ca²⁺ influx and reduced exocytosis proportional to Ca²⁺ current reduction, and impaired sound-onset encoding.","method":"Immunofluorescence; patch-clamp; fluctuation analysis; confocal Ca²⁺ imaging; electron tomography; superresolution microscopy; hair cell-specific RIM2 deletion","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including superresolution microscopy and cell-type-specific genetic deletion","pmids":["26034270"],"is_preprint":false},{"year":2015,"finding":"The CaV1.3 C-terminal automodulatory domain (CTM) functions in a cell-type-specific manner in vivo: CTM elimination impairs Ca²⁺-dependent inactivation in cochlear IHCs but increases it in chromaffin cells (reducing resting potential and pacemaking), while not affecting hearing thresholds. Biochemical evidence from CTM-tagged knockin mice confirms existence of long and short CaV1.3 α1-subunit isoforms in brain.","method":"Knockin mice with HA-tagged CTM (Cav1.3DCRD_HA/HA); patch-clamp of IHCs and chromaffin cells; Western blot; auditory brainstem responses","journal":"Frontiers in cellular neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic model with electrophysiology in two native cell types plus biochemical validation","pmids":["26379493"],"is_preprint":false},{"year":2014,"finding":"Cav1.3 L-type Ca²⁺ channel activity in substantia nigra dopamine neurons is required for homeostatic modulation of D2-autoreceptor responses: Cav1.3 activity, internal Ca²⁺, and neuronal calcium sensor NCS-1 interaction with D2-autoreceptors are required for expression of sensitized D2-AR phenotype; L-DOPA or cocaine induces adult-like non-desensitizing D2-AR responses via this Cav1.3/NCS-1/D2/GIRK2 signaling network.","method":"Electrophysiology in acute brain slices; pharmacological and genetic tools; mRNA analysis of human SN DA neurons","journal":"Brain : a journal of neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and genetic dissection of a signaling network in native neurons, single lab","pmids":["24934288"],"is_preprint":false},{"year":2016,"finding":"Cav1.3 channels regulate ryanodine receptor-dependent Ca²⁺ release during SAN pacemaker activity: Cav1.3 deficiency reduces the frequency of local Ca²⁺ release events and prevents their synchronization; pacemaker activity in Cav1.3-/- SAN cells was rescued by caffeine-mediated stimulation of Ca²⁺-induced Ca²⁺ release, showing Cav1.3 triggers local Ca²⁺ release to control automaticity.","method":"Isolated SAN cells and ex vivo SAN preparations from Cav1.3-/- mice; Ca²⁺ imaging; action potential voltage-clamp commands","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with multiple Ca²⁺ imaging and electrophysiological methods, functional rescue experiment","pmids":["26786159"],"is_preprint":false},{"year":2016,"finding":"The α2δ2 auxiliary subunit co-assembles with CaV1.3 at IHC presynapses; loss of α2δ2 (ducky mouse) reduces CaV1.3-mediated Ca²⁺ currents by 30-40%, alters gating properties (activation voltage, voltage sensitivity), proportionally reduces exocytosis, and impairs trans-synaptic alignment of presynaptic CaV1.3 clusters with postsynaptic AMPA receptor clusters.","method":"Patch-clamp; exocytosis measurements; immunofluorescence; auditory brainstem responses in α2δ2-null mice","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic null model with multiple electrophysiological and structural readouts demonstrating co-assembly and trans-synaptic function","pmids":["27798183"],"is_preprint":false},{"year":2017,"finding":"De novo CaV1.3 mutation V401L (in the activation gate) causes gain-of-function: enhanced current density, hyperpolarizing shift in activation and inactivation voltage dependence, reduced inactivation; effects present in both long and short C-terminal splice variants. Mutant channels retain full sensitivity to isradipine.","method":"Whole-cell patch-clamp in tsA-201 cells expressing mutant channel complexes","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct electrophysiological characterization in heterologous expression, single lab, tested in two splice variant backgrounds","pmids":["28472301"],"is_preprint":false},{"year":2018,"finding":"Tissue-selective RNA editing of CaV1.3 mRNA by ADAR2 at the IQ domain depends on a 40 bp RNA duplex between exon 41 and an evolutionarily conserved editing site complementary sequence (ECS) in the preceding intron; splicing factor SRSF9 potently inhibits this editing by direct RNA interaction, and selective down-regulation of SRSF9 in neurons provides the basis for neuron-specific CaV1.3 editing.","method":"Minigene expression with ADAR2 co-expression; SRSF9 overexpression/knockdown; RNA-protein interaction assay; evolutionary sequence analysis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic dissection with minigene, knockdown, and RNA interaction assay; single lab","pmids":["29733375"],"is_preprint":false},{"year":2016,"finding":"Autism-associated mutation A760G (reported as A749G in patient) has opposing effects: it severely diminishes Ca²⁺-dependent inactivation (CDI) of CaV1.3 channels while simultaneously increasing voltage-dependent inactivation (VDI); the mechanism of CDI reduction involves enhanced channel opening within the Ca²⁺-inactivated mode, and the combined deficits are predicted to increase intracellular Ca²⁺.","method":"Whole-cell patch-clamp in HEK cells expressing mutant CaV1.3; allosteric model of channel gating","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology with mechanistic modeling in two splice variants, single lab","pmids":["27255217"],"is_preprint":false},{"year":2020,"finding":"CACNA1D gain-of-function mutation S652L causes a ~13-17 mV hyperpolarizing shift in activation and inactivation, increases window currents at subthreshold voltages, slows tail currents, and increases Ca²⁺ during AP-like stimulations; a corresponding S652W loss-of-function variant shifts parameters to more positive voltages, demonstrating that only gain-of-function variants confer high disease risk. S652L increases CaV1.3 sensitivity to isradipine 3-4-fold.","method":"Whole-cell patch-clamp of tsA-201 cells expressing mutant channel complexes; comparison of gain- vs. loss-of-function variants","journal":"Molecular autism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct electrophysiology with mechanistic comparison of GOF vs. LOF variants, single lab","pmids":["31921405"],"is_preprint":false},{"year":2009,"finding":"Whirlin (USH2D protein) specifically interacts with CaV1.3 (α1D) C-terminal PDZ-binding motif; in adult photoreceptors, CaV1.3 and whirlin co-localize at the connecting cilium region and at the synapse, indicating CaV1.3 is a component of the Usher protein network in the retina.","method":"Yeast two-hybrid; GST pull-down; co-immunoprecipitation; immunofluorescence and immunoelectron microscopy in retina","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple binding assays with structural localization, single lab","pmids":["19959638"],"is_preprint":false},{"year":1995,"finding":"CACNA1D (CACN4) requires co-expression with the β2-subunit for functional L-type Ca²⁺ channel expression; α1 subunit alone yields no current, whereas α1+β2 co-expression produces L-type currents in CHO cells. Multiple alternatively spliced variants are expressed in pancreatic islets.","method":"Stable expression in CHO cells; whole-cell voltage-clamp; RT-PCR of rat islets","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional reconstitution in heterologous cells demonstrating β-subunit requirement, single lab","pmids":["7760845"],"is_preprint":false},{"year":2001,"finding":"The neuroendocrine CaV1.3 channel is stimulated (not inhibited) by ligand-bound Gi/Go-coupled GPCRs; this stimulation is mimicked by phorbol ester and blocked by serine/threonine kinase inhibitors but not by PI3K inhibitor wortmannin, indicating PKC-dependent GPCR stimulation of CaV1.3, distinct from the inhibitory Gi/Go modulation seen in CaV2.2 channels.","method":"Heterologous expression in Xenopus oocytes; whole-cell voltage-clamp; pharmacological inhibitors","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional reconstitution with pharmacological dissection, single lab","pmids":["11435619"],"is_preprint":false}],"current_model":"CaV1.3 (CACNA1D) encodes the pore-forming α1 subunit of a voltage-gated L-type Ca²⁺ channel that activates at uniquely negative voltages (controlled by alternative C-terminal splicing that modulates coupling of voltage-sensor movement to gate opening and Ca²⁺/calmodulin-dependent inactivation), is regulated by PKA (phosphorylation increases activity), PKC (phosphorylation at S81 decreases activity), CaMKII/densin-dependent facilitation, and IGF-1/IP3/CaMKII-dependent potentiation (via S1486 phosphorylation); it forms macromolecular complexes at postsynaptic densities via Shank PDZ/SH3 interactions and at presynaptic active zones via RIM2 and harmonin scaffolding, co-assembles with auxiliary α2δ2 and β subunits, and physically couples to RyR2, GABABR2, otoferlin, and whirlin; in the sinoatrial node it drives diastolic depolarization by triggering RyR-dependent Ca²⁺ release, in cochlear inner hair cells it mediates ribbon-synapse exocytosis through nanodomain Ca²⁺ control, and somatic or germline gain-of-function mutations in disease-critical pore residues cause primary aldosteronism, autism spectrum disorder, and PASNA syndrome, while loss-of-function causes SANDD syndrome."},"narrative":{"mechanistic_narrative":"CACNA1D encodes CaV1.3, the pore-forming α1 subunit of a low-voltage-activating L-type Ca²⁺ channel that opens at uniquely negative potentials (~-45 mV) and inactivates slowly, requiring co-assembly with auxiliary β and α2δ subunits for functional surface expression [PMID:11285265, PMID:7760845, PMID:27798183]. A central determinant of its gating is its alternatively spliced C-terminus: a C-terminal modulatory domain (CTM) engages in an intramolecular interaction that weakens coupling of voltage-sensor charge movement to pore opening and tunes calmodulin-dependent inactivation, so that short variants lacking the CTM activate at more negative voltages and show enhanced Ca²⁺-dependent inactivation [PMID:18482979, PMID:24703308, PMID:21998309]. Channel output is further shaped by ADAR-mediated RNA editing of the IQ domain, which weakens apoCaM pre-association to make CDI continuously tunable [PMID:24120865, PMID:29733375], and by signaling: PKA increases current [PMID:15615842], PKC phosphorylation at S81 decreases it [PMID:16973824], and an IGF-1/PLC/IP3/CaMKII pathway phosphorylates S1486 to potentiate the channel and drive CREB signaling [PMID:16763033], with CaMKII/densin conferring Ca²⁺-dependent facilitation [PMID:20392935]. CaV1.3 assembles into cell-type-specific macromolecular complexes: postsynaptically its C-terminal PDZ-binding and proline-rich motifs bind Shank PDZ and SH3 domains for synaptic clustering and pCREB signaling [PMID:15689539, PMID:15689540], and it couples to RyR2 [PMID:17823125] and GABABR2 [PMID:20627102]; at inner-hair-cell ribbon synapses it clusters at active zones under control of RIM2 and harmonin scaffolds and physically engages otoferlin [PMID:26034270, PMID:21822269, PMID:23613530, PMID:19004828]. Functionally, CaV1.3 triggers RyR-dependent Ca²⁺ release to drive sinoatrial node diastolic depolarization and pacemaking [PMID:12700358, PMID:26786159], and mediates nanodomain Ca²⁺ control of ribbon-synapse exocytosis and maturation in cochlear hair cells [PMID:16354915, PMID:14645476, PMID:23197719]. Loss-of-function mutation causes SANDD syndrome (sinoatrial node dysfunction and deafness) [PMID:21131953], whereas gain-of-function mutations in pore and gating residues cause primary aldosteronism with neuromuscular features and are found in autism spectrum disorder [PMID:23913001, PMID:25620733, PMID:31921405].","teleology":[{"year":1995,"claim":"Established that the CACNA1D α1 subunit is non-functional alone and requires an auxiliary β subunit to form L-type current, defining the channel as a multi-subunit complex.","evidence":"Stable expression of α1 ± β2 in CHO cells with voltage-clamp; RT-PCR of pancreatic islets","pmids":["7760845"],"confidence":"Medium","gaps":["Did not resolve native subunit stoichiometry","Splice-variant–specific gating not characterized"]},{"year":2001,"claim":"Defined the biophysical signature distinguishing CaV1.3 from CaV1.2 — activation at negative voltages, slow inactivation, and voltage-dependent rather than affinity-based low DHP sensitivity — and showed exon 8A is required for functional expression.","evidence":"Whole-cell patch-clamp of cloned human α1D splice variants in tsA-201 cells plus radioligand binding","pmids":["11285265"],"confidence":"High","gaps":["Did not address in vivo physiological role","Structural basis of negative-voltage activation unresolved"]},{"year":2001,"claim":"Showed neuroendocrine CaV1.3 is stimulated rather than inhibited by Gi/Go-coupled GPCRs via a PKC-dependent mechanism, distinguishing its GPCR modulation from CaV2.2.","evidence":"Xenopus oocyte expression with voltage-clamp and pharmacological inhibitors","pmids":["11435619"],"confidence":"Medium","gaps":["Phosphorylation site not mapped here","Native cell relevance untested"]},{"year":2003,"claim":"Genetic knockout established CaV1.3 as essential for cardiac pacemaking and for cochlear inner hair cell maturation and exocytosis, linking the channel to two distinct physiological systems.","evidence":"Cav1.3 KO mice; SAN and IHC patch-clamp; caged-Ca²⁺ photolysis; developmental immunohistochemistry","pmids":["12700358","14645476"],"confidence":"High","gaps":["Downstream effectors of pacemaking not yet defined","Molecular basis of IHC maturation requirement unclear"]},{"year":2005,"claim":"Resolved how CaV1.3 is anchored and clustered at synapses, showing its C-terminal PDZ-binding and proline-rich motifs bind Shank PDZ and SH3 domains and are required for synaptic clustering, GPCR modulation, and pCREB signaling.","evidence":"Yeast two-hybrid, GST pull-down, neuronal expression with dominant-negative peptides and DHP-resistant mutants; patch-clamp with PDZ-competing peptides and CaV1.3 KO","pmids":["15689539","15689540"],"confidence":"High","gaps":["Stoichiometry of the CaV1.3–Shank–Homer complex unresolved","Whether clustering requires additional scaffolds untested"]},{"year":2005,"claim":"Demonstrated nanodomain Ca²⁺ control of hair-cell exocytosis, with ~80 CaV1.3 channels per ribbon active zone and a few nearby channels gating vesicle release.","evidence":"Nonstationary fluctuation analysis, immunohistochemistry, and capacitance recordings in IHCs","pmids":["16354915"],"confidence":"High","gaps":["Physical channel–vesicle tethering molecules not identified here","Active-zone architecture not resolved"]},{"year":2006,"claim":"Identified bidirectional kinase control of CaV1.3 — PKA increases current while PKC phosphorylation at N-terminal S81 (isozyme-selective) decreases it.","evidence":"Heterologous patch-clamp with 8-Br-cAMP/PKI, S81D phosphomimetic, competing peptide, and isozyme-selective PKC activators; phospho-Western blot","pmids":["15615842","16973824"],"confidence":"High","gaps":["PKA phosphoacceptor residue not precisely mapped","In vivo physiological context of S81 regulation untested"]},{"year":2006,"claim":"Defined an IGF-1/PLC/IP3/CaMKII signaling cascade that phosphorylates EF-hand residue S1486 to potentiate CaV1.3 and drive CREB phosphorylation, linking channel modulation to gene expression.","evidence":"S1486A mutagenesis, pathway pharmacology, patch-clamp, and pCREB immunofluorescence in neurons","pmids":["16763033"],"confidence":"High","gaps":["Direct CaMKII–S1486 phosphorylation not biochemically confirmed","Endogenous trigger in vivo undefined"]},{"year":2007,"claim":"Established physical and functional coupling of CaV1.3 to RyR2 and to CaBP1, connecting the channel to intracellular Ca²⁺ release and to anomalous inactivation control.","evidence":"Yeast two-hybrid, co-IP from hippocampus, siRNA knockdown; patch-clamp in IHCs and transfected cells with CaBP1","pmids":["17823125","17947313"],"confidence":"Medium","gaps":["RyR2 interaction not reconstituted in vitro","Direct CaBP1 binding site mapping incomplete"]},{"year":2008,"claim":"Identified the C-terminal modulatory domain (CTM) as an intramolecular regulator of gating and CaM binding, generated by alternative splicing of the C-terminus.","evidence":"Patch-clamp of truncations, CTM-peptide rescue, and FRET in HEK-293 cells","pmids":["18482979"],"confidence":"High","gaps":["Atomic structure of the CTM interaction unresolved","In vivo isoform ratios not quantified here"]},{"year":2008,"claim":"Showed otoferlin binds the CaV1.3 II-III loop in a Ca²⁺-dependent manner and that a DFNB9 mutation disrupts this, linking the channel to hair-cell synaptic vesicle machinery.","evidence":"GST pull-down with DFNB9 fusion proteins and Kd determination","pmids":["19004828"],"confidence":"Medium","gaps":["Interaction not validated in native IHCs","Functional consequence on exocytosis inferred, not measured"]},{"year":2009,"claim":"Placed CaV1.3 in the retinal Usher protein network by demonstrating whirlin binding to its C-terminal PDZ motif and co-localization at photoreceptor cilium and synapse.","evidence":"Yeast two-hybrid, GST pull-down, co-IP, immuno-EM in retina","pmids":["19959638"],"confidence":"Medium","gaps":["Functional role of CaV1.3 in photoreceptors not established","Single-lab interaction data"]},{"year":2010,"claim":"Connected CaV1.3 to human disease for the first time, showing a loss-of-function insertion causes non-conducting channels and SANDD syndrome matching the KO mouse.","evidence":"Positional cloning with heterologous expression and patch-clamp of mutant channel","pmids":["21131953"],"confidence":"High","gaps":["Limited number of affected families","Tissue-specific severity determinants unclear"]},{"year":2010,"claim":"Defined complexes conferring facilitation and active-zone properties: densin/CaMKII enables Ca²⁺-dependent facilitation, and RIM proteins binding the β-subunit slow inactivation to generate the IHC window current.","evidence":"Co-IP from brain, HEK293 reconstitution, dominant-negative CaMKII, domain mapping; tsA-201 patch-clamp with RIM co-localization","pmids":["20392935","20363327"],"confidence":"High","gaps":["RIM–CaV1.3 contact is indirect (via β-subunit)","In vivo facilitation contribution not quantified"]},{"year":2011,"claim":"Established harmonin as a dual regulator that limits CaV1.3 availability via ubiquitin-dependent degradation and, through dCT binding, enhances voltage-dependent facilitation and synchronous IHC exocytosis.","evidence":"Co-IP, IHC immunolocalization, ubiquitin pathway assays; patch-clamp and capacitance in dfcr mutant IHCs with domain deletion","pmids":["21822269","23613530"],"confidence":"High","gaps":["E3 ligase mediating degradation not identified","Balance between degradation and facilitation roles unresolved"]},{"year":2011,"claim":"Mapped how alternative splicing at multiple C-terminal loci tunes inactivation, expanding the repertoire of functionally distinct CaV1.3 isoforms.","evidence":"Transcript-scanning, splice-variant antibodies, and patch-clamp of each HEK-expressed variant","pmids":["21998309"],"confidence":"Medium","gaps":["Tissue distribution of each variant incompletely defined","Physiological role of individual variants untested"]},{"year":2013,"claim":"Defined CaV1.3 gain-of-function disease mechanism, showing somatic and germline mutations at Gly403/Ile770 shift activation and impair inactivation to cause aldosterone-producing adenomas and primary aldosteronism with neuromuscular features.","evidence":"Mutation identification with heterologous electrophysiology","pmids":["23913001"],"confidence":"High","gaps":["Mechanism linking Ca²⁺ influx to aldosterone production not detailed","Neuromuscular phenotype mechanism unclear"]},{"year":2013,"claim":"Revealed RNA editing as a post-transcriptional tuner of CDI, acting by weakening apoCaM pre-binding rather than Ca²⁺/CaM binding, making inactivation responsive to ambient CaM.","evidence":"Electrophysiology of edited vs unedited channels with CaM binding assays in HEK cells and substantia nigra neurons","pmids":["24120865"],"confidence":"High","gaps":["In vivo editing levels across tissues not mapped here","Functional consequence for neuronal excitability not directly tested"]},{"year":2013,"claim":"Identified a CaV1.3–GABABR2 interaction in which GABAB activation selectively increases CaV1.3 current, defining a receptor–channel signaling unit.","evidence":"Yeast two-hybrid, GST pull-down, co-IP, co-localization, patch-clamp, and Ca²⁺ imaging","pmids":["20627102"],"confidence":"Medium","gaps":["Native physiological context untested","Single-lab data"]},{"year":2014,"claim":"Extended CaV1.3 gain-of-function disease to autism spectrum disorder via de novo mutations enhancing Ca²⁺ influx, and uncovered opposing CDI/VDI effects of one autism allele.","evidence":"Patch-clamp of patient-derived mutant channels in tsA-201/HEK cells with allosteric gating modeling","pmids":["25620733","27255217"],"confidence":"Medium","gaps":["Neuronal/behavioral consequences not modeled in vivo","Single-lab electrophysiology"]},{"year":2014,"claim":"Demonstrated a non-canonical role: the CaV1.3 C-terminal domain translocates to the nucleus in a Ca²⁺-dependent manner to act as a transcriptional regulator of SK2 channel expression.","evidence":"CaV1.3 null mice, nuclear fractionation, reporter assays, and co-IP","pmids":["25538241"],"confidence":"Medium","gaps":["DNA-binding partners of the C-terminal fragment unknown","Cleavage mechanism generating the fragment undefined"]},{"year":2014,"claim":"Defined the CTM mechanistically as a regulator of voltage-sensor-to-gate coupling, and showed CaV1.3 in dopamine neurons supports homeostatic D2-autoreceptor tuning via an NCS-1/GIRK2 network.","evidence":"Simultaneous gating- and ionic-current measurements of splice variants; brain-slice electrophysiology with genetic/pharmacological tools","pmids":["24703308","24934288"],"confidence":"High","gaps":["Structural basis of CTM-mediated coupling unresolved","Direct CaV1.3–NCS-1 contact not demonstrated"]},{"year":2015,"claim":"Confirmed in vivo, cell-type-specific CTM function and that RIM2 promotes synaptic CaV1.3 channel abundance required for sound-onset encoding.","evidence":"CTM-tagged knockin mice with IHC/chromaffin patch-clamp; hair-cell-specific RIM2 deletion with superresolution microscopy, Ca²⁺ imaging, and electron tomography","pmids":["26379493","26034270"],"confidence":"High","gaps":["Mechanism of RIM2-dependent channel recruitment incompletely defined","CTM regulation in other cell types untested"]},{"year":2016,"claim":"Established that CaV1.3 triggers and synchronizes RyR-dependent local Ca²⁺ release to control sinoatrial automaticity, with caffeine-induced CICR rescuing pacemaking in KO cells.","evidence":"Ca²⁺ imaging and AP-clamp in Cav1.3-/- SAN cells and ex vivo preparations with functional rescue","pmids":["26786159"],"confidence":"High","gaps":["Spatial relationship of CaV1.3 to RyR in SAN not directly imaged","Quantitative contribution vs. surface-membrane clock unresolved"]},{"year":2016,"claim":"Showed the α2δ subunit co-assembles with CaV1.3 at IHC presynapses, supporting current amplitude, gating, exocytosis, and trans-synaptic alignment with postsynaptic AMPA receptors.","evidence":"Patch-clamp, exocytosis measurements, immunofluorescence, and ABR in α2δ2-null (ducky) mice","pmids":["27798183"],"confidence":"High","gaps":["Molecular basis of trans-synaptic alignment unclear","Whether α2δ directly mediates clustering untested"]},{"year":2017,"claim":"Extended the gain-of-function disease spectrum with activation-gate mutation V401L producing enhanced current and hyperpolarized gating in both splice backgrounds while retaining isradipine sensitivity.","evidence":"Whole-cell patch-clamp of mutant channel complexes in tsA-201 cells","pmids":["28472301"],"confidence":"Medium","gaps":["In vivo consequence not modeled","Single-lab data"]},{"year":2018,"claim":"Defined the molecular basis of tissue-selective IQ-domain editing, showing an exon41–intron RNA duplex (ECS) and SRSF9 control ADAR2 access, with neuronal SRSF9 down-regulation enabling neuron-specific editing.","evidence":"Minigene assays with ADAR2, SRSF9 overexpression/knockdown, RNA–protein interaction assays, and evolutionary analysis","pmids":["29733375"],"confidence":"Medium","gaps":["In vivo editing regulation by SRSF9 not confirmed","Other splice-editing crosstalk loci untested"]},{"year":2020,"claim":"Distinguished gain- versus loss-of-function as the disease determinant at residue S652, showing only the hyperpolarizing GOF variant (S652L) increases window currents and Ca²⁺ load and confers high disease risk.","evidence":"Comparative whole-cell patch-clamp of S652L vs S652W mutant channel complexes in tsA-201 cells","pmids":["31921405"],"confidence":"Medium","gaps":["Genotype–phenotype correlation across patients incomplete","Therapeutic relevance of increased isradipine sensitivity untested in vivo"]},{"year":null,"claim":"How CaV1.3 macromolecular complexes are assembled and spatially organized into cell-type-specific signaling units (cardiac, cochlear, neuronal), and the structural basis of CTM-mediated gating and CaM/editing tuning, remain to be resolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No atomic structure of CaV1.3 with its scaffolds/auxiliary subunits in the corpus","Mechanism generating and targeting the nuclear C-terminal fragment unknown","In vivo integration of kinase, editing, and splicing regulation not unified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,1,36]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,11,25]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[24]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,3,26,30]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[24]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[35]}],"pathway":[{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[1,29]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[4,5,28]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,7,8,21]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[13,19,23,34]}],"complexes":["CaV1.3 L-type channel (α1D/β/α2δ)","postsynaptic density CaV1.3–Shank–Homer complex","IHC ribbon-synapse active zone (CaV1.3–RIM2–harmonin)","CaV1.3–densin–CaMKII complex"],"partners":["SHANK","RIMS2","USH1C","OTOF","RYR2","GABBR2","CABP1","WHRN"],"other_free_text":[]}},"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. 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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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Radioligand binding showed lower DHP sensitivity is due to voltage-dependence of DHP block rather than reduced affinity for the DHP binding pocket.\",\n      \"method\": \"Whole-cell patch-clamp of tsA-201 cells expressing cloned human α1D splice variants; radioligand binding experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct electrophysiological reconstitution with radioligand binding, multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"11285265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Genetic inactivation of Cav1.3 in mice significantly slows sinoatrial node (SAN) pacemaker activity and promotes spontaneous arrhythmia; Cav1.3 contributes a major component of L-type current (ICa,L) activating at negative voltages corresponding to the diastolic depolarization range, demonstrating its essential role in cardiac pacemaking.\",\n      \"method\": \"Gene-targeted knockout mice; patch-clamp recording of SAN cells; pharmacological dissection of ICa,L\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with clean electrophysiological phenotype, replicated in multiple subsequent studies\",\n      \"pmids\": [\"12700358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CaV1.3 channels are essential for cochlear inner hair cell (IHC) development and synaptic transmission: CaV1.3-/- IHCs lack Ca²⁺ action potentials, show only marginal depolarization-induced exocytosis (proportional to the residual Ca²⁺ current), retain efferent cholinergic synaptic input beyond normal developmental window, and fail to acquire large-conductance Ca²⁺-activated K⁺ channels, indicating CaV1.3 is required for normal IHC maturation.\",\n      \"method\": \"Patch-clamp recordings in CaV1.3-/- mouse IHCs; photolysis of caged Ca²⁺; developmental immunohistochemistry\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with multiple orthogonal electrophysiological and developmental phenotypic readouts\",\n      \"pmids\": [\"14645476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CaV1.3 channels are concentrated at ribbon-type active zones of IHCs (~80 channels per active zone); exocytosis of the readily releasable vesicle pool shows near-unity apparent Ca²⁺ cooperativity when open-channel number is manipulated but high intrinsic cooperativity when single-channel current is varied, indicating nanodomain Ca²⁺ control of exocytosis by few nearby CaV1.3 channels.\",\n      \"method\": \"Nonstationary fluctuation analysis; immunohistochemistry; membrane capacitance recordings with pharmacological manipulation of Ca²⁺ current\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (fluctuation analysis, IHC, capacitance recordings) in a single focused study\",\n      \"pmids\": [\"16354915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"D2 dopaminergic and M1 muscarinic GPCR modulation of CaV1.3 channels in striatal medium spiny neurons depends on a Shank-binding PDZ domain in the CaV1.3 C-terminus; disruption of the CaV1.3 PDZ–Shank interaction or the Shank–Homer interaction abolishes this GPCR modulation. Shank colocalized with CaV1.3a at spine-like puncta co-expressing PSD-95 and corticostriatal synaptic markers.\",\n      \"method\": \"Whole-cell patch-clamp; intracellular peptide dialysis to compete PDZ binding; genetic deletion of CaV1.3; immunohistochemistry\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal functional disruption with competing peptides, genetic KO, and co-localization; multiple orthogonal approaches\",\n      \"pmids\": [\"15689540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CaV1.3a (long C-terminal splice variant) specifically associates with Shank via two distinct interactions: the C-terminal PDZ-binding motif binds the Shank PDZ domain, and the proline-rich region binds the Shank SH3 domain. Shank-binding motifs in CaV1.3a are necessary and sufficient for synaptic clustering of CaV1.3 channels and are required for pCREB signaling in hippocampal neurons.\",\n      \"method\": \"Yeast two-hybrid screen; in vitro GST pull-down; recombinant epitope-tagged CaV1.3 in hippocampal neurons; dominant-negative peptides; DHP-resistant CaV1.3 mutants\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reconstitution of binding in vitro, yeast two-hybrid, neuronal localization experiments with dominant-negative and mutagenesis controls\",\n      \"pmids\": [\"15689539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PKA phosphorylation of CaV1.3 α1D at a serine residue (confirmed by 8-Br-cAMP stimulation and PKI inhibition) significantly increases peak CaV1.3 Ca²⁺ current density, identifying PKA as a positive regulator of CaV1.3 channel activity in the sinoatrial node and atria.\",\n      \"method\": \"Heterologous expression in tsA201 cells; whole-cell patch-clamp; 8-Br-cAMP; PKA inhibitor PKI; Western blot phosphorylation assay\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology combined with biochemical phosphorylation in a single lab\",\n      \"pmids\": [\"15615842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PKC inhibits CaV1.3 Ca²⁺ channel activity through phosphorylation of serine 81 in the N-terminal domain; a S81D phosphomimetic mutation recapitulates PKC inhibition, a competing peptide spanning S81 prevents it, and only βII- and ε-PKC isozymes mediate this regulation.\",\n      \"method\": \"Site-directed mutagenesis (S81D); competing N-terminal peptide dialysis; isozyme-selective PKC activators; whole-cell patch-clamp in heterologous expression\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis with phosphomimetic, competing peptide, and isozyme specificity; multiple orthogonal methods in one study\",\n      \"pmids\": [\"16973824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"IGF-1 potentiates CaV1.3 channels via a signaling pathway requiring PLC, Ca²⁺ release from IP3-sensitive stores, and CaMKII phosphorylation of serine S1486 in the EF-hand motif of the CaV1.3 α1 subunit; this causes a left-shift in the I-V relationship and potentiates CREB phosphorylation.\",\n      \"method\": \"Site-directed mutagenesis (S1486A); pharmacological inhibitors of PLC, IP3R, CaMKII; whole-cell patch-clamp; pCREB immunofluorescence in cortical/hippocampal neurons\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of identified phosphorylation site combined with pathway pharmacology and functional readouts in multiple cell types\",\n      \"pmids\": [\"16763033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The N-terminus of CaV1.3 α1 subunit physically interacts with the N-terminal region of ryanodine receptor type 2 (RyR2); this complex is co-immunoprecipitated from hippocampal tissue, and CaV1.3 activation triggers RyR-dependent Ca²⁺ release and upregulates RyR2 mRNA; siRNA silencing of CaV1.3 blocks both acute and long-term effects on RyR.\",\n      \"method\": \"Yeast two-hybrid; co-immunoprecipitation from rat hippocampus; immunocytochemistry; siRNA knockdown; KCl depolarization assay; RT-PCR\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP from native tissue combined with functional siRNA knockdown, single lab\",\n      \"pmids\": [\"17823125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CaBP1, a Ca²⁺-binding protein, most efficiently suppresses Ca²⁺-dependent inactivation (CDI) of CaV1.3 channels in transfected cells by interacting with calmodulin-binding sequences in CaV1.3; CaBP1 is strongly localized at the presynaptic ribbon synapse of adult IHCs and is implicated in conferring the anomalously slow CDI of CaV1.3 currents required for auditory transmission.\",\n      \"method\": \"Whole-cell patch-clamp in transfected cells and IHCs from CaBP4-/- mice; immunolocalization; binding assay\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology in native cells combined with knockout mice and co-localization, single lab\",\n      \"pmids\": [\"17947313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Alternative splicing of the CaV1.3 C-terminus generates long (CaV1.3_42) and short (CaV1.3_42A) variants; the short form activates at more negative voltages and shows enhanced CDI. The last 116 aa of the C-terminus constitutes a C-terminal modulatory domain (CTM); co-expression of the CTM peptide reverts short-form gating. FRET experiments confirmed an intramolecular interaction within the C-terminus that also modulates calmodulin binding.\",\n      \"method\": \"Patch-clamp of HEK-293 cells; channel truncations; co-expression of CTM peptide; FRET experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — functional reconstitution with truncations, peptide rescue, and FRET structural validation in a single rigorous study\",\n      \"pmids\": [\"18482979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Otoferlin C2D domain binds the CaV1.3 II-III intracellular loop in a Ca²⁺-dependent manner; the DFNB9 deafness mutation L1011P in C2D renders this binding Ca²⁺-insensitive and greatly diminished, implicating CaV1.3–otoferlin interaction in regulation of hair cell synaptic exocytosis.\",\n      \"method\": \"GST pull-down with fusion proteins containing DFNB9 mutations; Ca²⁺-dependent binding assays; Kd determination\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro binding with mutagenesis, Ca²⁺ dependency, and disease-mutation validation; single lab\",\n      \"pmids\": [\"19004828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Loss-of-function CACNA1D mutation (glycine insertion in a conserved alternatively spliced region near the channel pore) results in non-conducting CaV1.3 channels with abnormal voltage-dependent gating, causing SANDD syndrome (sinoatrial node dysfunction and deafness) in humans, closely resembling the Cacna1d-/- mouse phenotype.\",\n      \"method\": \"Positional cloning; heterologous expression of mutant channel with patch-clamp recordings\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human genetics with functional characterization of mutant channel in expression system, phenotype matching KO mouse\",\n      \"pmids\": [\"21131953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Densin is required for Ca²⁺-dependent facilitation of CaV1.3 channels: neither CaMKII nor densin alone affects CaV1.3, but together they augment CaV1.3 Ca²⁺ currents during repetitive stimuli; facilitation requires CaMKII activation and its association with densin, as well as densin binding to the CaV1.3 α1 subunit C-terminal domain. CaV1.3, densin, and CaMKII form a complex in brain.\",\n      \"method\": \"Co-immunoprecipitation from brain; transfection in HEK293T cells; patch-clamp; dominant-negative CaMKII; binding domain mapping\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP from brain tissue, electrophysiological reconstitution, domain mapping; multiple orthogonal methods\",\n      \"pmids\": [\"20392935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RIM2α protein co-localizes with CaV1.3 at the presynaptic compartment of cochlear IHCs; RIM proteins bind the β-subunit of the CaV1.3 channel complex and slow both Ca²⁺- and voltage-dependent inactivation, generating a non-inactivating window current characteristic of IHC CaV1.3 currents.\",\n      \"method\": \"Co-localization immunofluorescence; heterologous expression with patch-clamp in tsA-201 cells\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiological reconstitution with co-localization, single lab, interaction inferred via β-subunit binding\",\n      \"pmids\": [\"20363327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Harmonin, a scaffolding protein at the IHC presynapse, interacts with CaV1.3 and limits channel availability through a ubiquitin-dependent proteosomal degradation pathway.\",\n      \"method\": \"Co-immunoprecipitation; immunolocalization at IHC presynapse; ubiquitin pathway assay\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct biochemical interaction with defined mechanistic pathway (ubiquitin-dependent degradation) published in high-impact journal\",\n      \"pmids\": [\"21822269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Alternative splicing at four loci in the CaV1.3 C-terminus (exons 41, 43, 44, 48) modulates channel electrophysiological properties: splicing of exon 41 removes the IQ motif causing diminished inactivation; exon 43 splicing causes a frameshift with robust inactivation; exons 44 and 48 alter interaction of the distal modulator with the IQ domain, tapering inactivation.\",\n      \"method\": \"Transcript-scanning; splice-variant-specific antibodies for localization; patch-clamp of HEK cells expressing each variant\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional characterization of multiple splice variants with electrophysiology, single lab\",\n      \"pmids\": [\"21998309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Presynaptic CaV1.3 activity regulates synaptic ribbon size in zebrafish hair cells: genetic disruption or acute pharmacological block of CaV1.3a causes ribbon enlargement, while channel activation reduces ribbon size and the number of intact synapses. Ca²⁺ influx through CaV1.3 is required for synaptic maintenance (independent of neurotransmission).\",\n      \"method\": \"In vivo Ca²⁺ imaging; confocal and super-resolution microscopy; pharmacological block/activation; vglut3 mutant controls\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacological dissection with high-resolution imaging, zebrafish model, single lab\",\n      \"pmids\": [\"23197719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Somatic gain-of-function mutations at Gly403 (four variants) and Ile770 in CaV1.3 cause aldosterone-producing adenomas by shifting channel activation to less depolarized potentials; Gly403 alterations additionally impair channel inactivation. De novo germline mutations at identical positions cause primary aldosteronism with neuromuscular abnormalities.\",\n      \"method\": \"Somatic/germline mutation identification; electrophysiological characterization of mutant channels expressed in heterologous cells\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional characterization of multiple patient-derived mutations across independent cases\",\n      \"pmids\": [\"23913001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RNA editing of the CaV1.3 IQ domain (by ADAR) reduces Ca²⁺-dependent inactivation (CDI) not by weakening Ca²⁺/CaM binding to the edited IQ domain, but by weakening the pre-binding of Ca²⁺-free CaM (apoCaM) to the channel, thereby making CDI continuously tunable by ambient CaM levels.\",\n      \"method\": \"Electrophysiology of edited vs. unedited CaV1.3 in HEK cells; CaM binding assays; experiments in substantia nigra neurons\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mechanistic dissection of editing effect with binding assays and electrophysiology, validated in native neurons\",\n      \"pmids\": [\"24120865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CaV1.3 α1D interacts with GABAB receptor subunit 2 (GABABR2): CaV1.3-NT associates with GABABR2-CT, they co-localize in HEK293 cells and hippocampal neurons, and GABABR activation selectively increases CaV1.3 currents and intracellular Ca²⁺ via CaV1.3 but not CaV1.2.\",\n      \"method\": \"Yeast two-hybrid; GST pull-down; co-immunoprecipitation; co-localization immunofluorescence; patch-clamp; Ca²⁺ imaging\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding methods plus functional demonstration; single lab\",\n      \"pmids\": [\"20627102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Harmonin binding to the CaV1.3 α1 subunit distal C-terminus (dCT) enhances voltage-dependent facilitation (VDF) of CaV1.3 currents and promotes synchronous exocytosis in IHCs; the deaf-circler dfcr harmonin mutant, which does not interact with the α1.3 dCT, has reduced VDF and impaired synchronous exocytosis.\",\n      \"method\": \"Patch-clamp of HEK293T cells and mouse IHCs from dfcr mice; membrane capacitance recordings; domain deletion analysis\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — interaction domain mapping with physiological validation in IHCs, single lab\",\n      \"pmids\": [\"23613530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"De novo CaV1.3 mutations p.A749G and p.G407R found in autism spectrum disorder patients cause gain-of-function: p.A749G shifts voltage dependence of activation and inactivation ~15 mV to more negative voltages; p.G407R markedly slows current inactivation. Both are compatible with enhanced Ca²⁺ influx.\",\n      \"method\": \"Whole-cell patch-clamp of tsA-201 cells expressing patient-derived mutant channel complexes\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct electrophysiological characterization of two independent patient mutations in heterologous expression, single lab\",\n      \"pmids\": [\"25620733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The C-terminal domain of CaV1.3 translocates to the nucleus in a Ca²⁺-dependent manner, where it functions as a transcriptional regulator modulating SK2 channel expression; ablation of CaV1.3 decreases myosin light chain 2 protein, which interacts with and increases membrane localization of SK2 channels.\",\n      \"method\": \"CaV1.3 null mutant mouse; nuclear fractionation; transcriptional reporter assays; co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional KO combined with fractionation and co-IP, single lab\",\n      \"pmids\": [\"25538241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The C-terminal modulatory domain (CTM) of CaV1.3 controls coupling efficiency between voltage-sensor charge movement and pore opening: short variants lacking the CTM show stronger coupling, shifting ICa-V ~7.2 mV negative without altering charge movement (QON-V), demonstrating the CTM weakens voltage-sensor-to-gate coupling.\",\n      \"method\": \"Whole-cell patch-clamp measuring both gating currents (QON-V) and ionic currents (ICa-V) in tsA-201 cells expressing long and short CaV1.3 splice variants\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — simultaneous gating current and ionic current measurements with defined splice variants, clear mechanistic dissection\",\n      \"pmids\": [\"24703308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RIM2α and RIM2β promote the abundance of CaV1.3 Ca²⁺ channels at inner hair cell active zones: RIM2α-deficient IHCs cluster fewer synaptic CaV1.3 channels (shown by superresolution microscopy), have reduced Ca²⁺ influx and reduced exocytosis proportional to Ca²⁺ current reduction, and impaired sound-onset encoding.\",\n      \"method\": \"Immunofluorescence; patch-clamp; fluctuation analysis; confocal Ca²⁺ imaging; electron tomography; superresolution microscopy; hair cell-specific RIM2 deletion\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including superresolution microscopy and cell-type-specific genetic deletion\",\n      \"pmids\": [\"26034270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The CaV1.3 C-terminal automodulatory domain (CTM) functions in a cell-type-specific manner in vivo: CTM elimination impairs Ca²⁺-dependent inactivation in cochlear IHCs but increases it in chromaffin cells (reducing resting potential and pacemaking), while not affecting hearing thresholds. Biochemical evidence from CTM-tagged knockin mice confirms existence of long and short CaV1.3 α1-subunit isoforms in brain.\",\n      \"method\": \"Knockin mice with HA-tagged CTM (Cav1.3DCRD_HA/HA); patch-clamp of IHCs and chromaffin cells; Western blot; auditory brainstem responses\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic model with electrophysiology in two native cell types plus biochemical validation\",\n      \"pmids\": [\"26379493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cav1.3 L-type Ca²⁺ channel activity in substantia nigra dopamine neurons is required for homeostatic modulation of D2-autoreceptor responses: Cav1.3 activity, internal Ca²⁺, and neuronal calcium sensor NCS-1 interaction with D2-autoreceptors are required for expression of sensitized D2-AR phenotype; L-DOPA or cocaine induces adult-like non-desensitizing D2-AR responses via this Cav1.3/NCS-1/D2/GIRK2 signaling network.\",\n      \"method\": \"Electrophysiology in acute brain slices; pharmacological and genetic tools; mRNA analysis of human SN DA neurons\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and genetic dissection of a signaling network in native neurons, single lab\",\n      \"pmids\": [\"24934288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Cav1.3 channels regulate ryanodine receptor-dependent Ca²⁺ release during SAN pacemaker activity: Cav1.3 deficiency reduces the frequency of local Ca²⁺ release events and prevents their synchronization; pacemaker activity in Cav1.3-/- SAN cells was rescued by caffeine-mediated stimulation of Ca²⁺-induced Ca²⁺ release, showing Cav1.3 triggers local Ca²⁺ release to control automaticity.\",\n      \"method\": \"Isolated SAN cells and ex vivo SAN preparations from Cav1.3-/- mice; Ca²⁺ imaging; action potential voltage-clamp commands\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with multiple Ca²⁺ imaging and electrophysiological methods, functional rescue experiment\",\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; loss of α2δ2 (ducky mouse) reduces CaV1.3-mediated Ca²⁺ currents by 30-40%, alters gating properties (activation voltage, voltage sensitivity), proportionally reduces exocytosis, and impairs trans-synaptic alignment of presynaptic CaV1.3 clusters with postsynaptic AMPA receptor clusters.\",\n      \"method\": \"Patch-clamp; exocytosis measurements; immunofluorescence; auditory brainstem responses in α2δ2-null mice\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic null model with multiple electrophysiological and structural readouts demonstrating co-assembly and trans-synaptic function\",\n      \"pmids\": [\"27798183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"De novo CaV1.3 mutation V401L (in the activation gate) causes gain-of-function: enhanced current density, hyperpolarizing shift in activation and inactivation voltage dependence, reduced inactivation; effects present in both long and short C-terminal splice variants. Mutant channels retain full sensitivity to isradipine.\",\n      \"method\": \"Whole-cell patch-clamp in tsA-201 cells expressing mutant channel complexes\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct electrophysiological characterization in heterologous expression, single lab, tested in two splice variant backgrounds\",\n      \"pmids\": [\"28472301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Tissue-selective RNA editing of CaV1.3 mRNA by ADAR2 at the IQ domain depends on a 40 bp RNA duplex between exon 41 and an evolutionarily conserved editing site complementary sequence (ECS) in the preceding intron; splicing factor SRSF9 potently inhibits this editing by direct RNA interaction, and selective down-regulation of SRSF9 in neurons provides the basis for neuron-specific CaV1.3 editing.\",\n      \"method\": \"Minigene expression with ADAR2 co-expression; SRSF9 overexpression/knockdown; RNA-protein interaction assay; evolutionary sequence analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic dissection with minigene, knockdown, and RNA interaction assay; single lab\",\n      \"pmids\": [\"29733375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Autism-associated mutation A760G (reported as A749G in patient) has opposing effects: it severely diminishes Ca²⁺-dependent inactivation (CDI) of CaV1.3 channels while simultaneously increasing voltage-dependent inactivation (VDI); the mechanism of CDI reduction involves enhanced channel opening within the Ca²⁺-inactivated mode, and the combined deficits are predicted to increase intracellular Ca²⁺.\",\n      \"method\": \"Whole-cell patch-clamp in HEK cells expressing mutant CaV1.3; allosteric model of channel gating\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology with mechanistic modeling in two splice variants, single lab\",\n      \"pmids\": [\"27255217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CACNA1D gain-of-function mutation S652L causes a ~13-17 mV hyperpolarizing shift in activation and inactivation, increases window currents at subthreshold voltages, slows tail currents, and increases Ca²⁺ during AP-like stimulations; a corresponding S652W loss-of-function variant shifts parameters to more positive voltages, demonstrating that only gain-of-function variants confer high disease risk. S652L increases CaV1.3 sensitivity to isradipine 3-4-fold.\",\n      \"method\": \"Whole-cell patch-clamp of tsA-201 cells expressing mutant channel complexes; comparison of gain- vs. loss-of-function variants\",\n      \"journal\": \"Molecular autism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct electrophysiology with mechanistic comparison of GOF vs. LOF variants, single lab\",\n      \"pmids\": [\"31921405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Whirlin (USH2D protein) specifically interacts with CaV1.3 (α1D) C-terminal PDZ-binding motif; in adult photoreceptors, CaV1.3 and whirlin co-localize at the connecting cilium region and at the synapse, indicating CaV1.3 is a component of the Usher protein network in the retina.\",\n      \"method\": \"Yeast two-hybrid; GST pull-down; co-immunoprecipitation; immunofluorescence and immunoelectron microscopy in retina\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding assays with structural localization, single lab\",\n      \"pmids\": [\"19959638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"CACNA1D (CACN4) requires co-expression with the β2-subunit for functional L-type Ca²⁺ channel expression; α1 subunit alone yields no current, whereas α1+β2 co-expression produces L-type currents in CHO cells. Multiple alternatively spliced variants are expressed in pancreatic islets.\",\n      \"method\": \"Stable expression in CHO cells; whole-cell voltage-clamp; RT-PCR of rat islets\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional reconstitution in heterologous cells demonstrating β-subunit requirement, single lab\",\n      \"pmids\": [\"7760845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The neuroendocrine CaV1.3 channel is stimulated (not inhibited) by ligand-bound Gi/Go-coupled GPCRs; this stimulation is mimicked by phorbol ester and blocked by serine/threonine kinase inhibitors but not by PI3K inhibitor wortmannin, indicating PKC-dependent GPCR stimulation of CaV1.3, distinct from the inhibitory Gi/Go modulation seen in CaV2.2 channels.\",\n      \"method\": \"Heterologous expression in Xenopus oocytes; whole-cell voltage-clamp; pharmacological inhibitors\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional reconstitution with pharmacological dissection, single lab\",\n      \"pmids\": [\"11435619\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CaV1.3 (CACNA1D) encodes the pore-forming α1 subunit of a voltage-gated L-type Ca²⁺ channel that activates at uniquely negative voltages (controlled by alternative C-terminal splicing that modulates coupling of voltage-sensor movement to gate opening and Ca²⁺/calmodulin-dependent inactivation), is regulated by PKA (phosphorylation increases activity), PKC (phosphorylation at S81 decreases activity), CaMKII/densin-dependent facilitation, and IGF-1/IP3/CaMKII-dependent potentiation (via S1486 phosphorylation); it forms macromolecular complexes at postsynaptic densities via Shank PDZ/SH3 interactions and at presynaptic active zones via RIM2 and harmonin scaffolding, co-assembles with auxiliary α2δ2 and β subunits, and physically couples to RyR2, GABABR2, otoferlin, and whirlin; in the sinoatrial node it drives diastolic depolarization by triggering RyR-dependent Ca²⁺ release, in cochlear inner hair cells it mediates ribbon-synapse exocytosis through nanodomain Ca²⁺ control, and somatic or germline gain-of-function mutations in disease-critical pore residues cause primary aldosteronism, autism spectrum disorder, and PASNA syndrome, while loss-of-function causes SANDD syndrome.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CACNA1D encodes CaV1.3, the pore-forming α1 subunit of a low-voltage-activating L-type Ca²⁺ channel that opens at uniquely negative potentials (~-45 mV) and inactivates slowly, requiring co-assembly with auxiliary β and α2δ subunits for functional surface expression [#0, #36, #30]. A central determinant of its gating is its alternatively spliced C-terminus: a C-terminal modulatory domain (CTM) engages in an intramolecular interaction that weakens coupling of voltage-sensor charge movement to pore opening and tunes calmodulin-dependent inactivation, so that short variants lacking the CTM activate at more negative voltages and show enhanced Ca²⁺-dependent inactivation [#11, #25, #17]. Channel output is further shaped by ADAR-mediated RNA editing of the IQ domain, which weakens apoCaM pre-association to make CDI continuously tunable [#20, #32], and by signaling: PKA increases current [#6], PKC phosphorylation at S81 decreases it [#7], and an IGF-1/PLC/IP3/CaMKII pathway phosphorylates S1486 to potentiate the channel and drive CREB signaling [#8], with CaMKII/densin conferring Ca²⁺-dependent facilitation [#14]. CaV1.3 assembles into cell-type-specific macromolecular complexes: postsynaptically its C-terminal PDZ-binding and proline-rich motifs bind Shank PDZ and SH3 domains for synaptic clustering and pCREB signaling [#5, #4], and it couples to RyR2 [#9] and GABABR2 [#21]; at inner-hair-cell ribbon synapses it clusters at active zones under control of RIM2 and harmonin scaffolds and physically engages otoferlin [#26, #16, #22, #12]. Functionally, CaV1.3 triggers RyR-dependent Ca²⁺ release to drive sinoatrial node diastolic depolarization and pacemaking [#1, #29], and mediates nanodomain Ca²⁺ control of ribbon-synapse exocytosis and maturation in cochlear hair cells [#3, #2, #18]. Loss-of-function mutation causes SANDD syndrome (sinoatrial node dysfunction and deafness) [#13], whereas gain-of-function mutations in pore and gating residues cause primary aldosteronism with neuromuscular features and are found in autism spectrum disorder [#19, #23, #34].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established that the CACNA1D α1 subunit is non-functional alone and requires an auxiliary β subunit to form L-type current, defining the channel as a multi-subunit complex.\",\n      \"evidence\": \"Stable expression of α1 ± β2 in CHO cells with voltage-clamp; RT-PCR of pancreatic islets\",\n      \"pmids\": [\"7760845\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not resolve native subunit stoichiometry\", \"Splice-variant–specific gating not characterized\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined the biophysical signature distinguishing CaV1.3 from CaV1.2 — activation at negative voltages, slow inactivation, and voltage-dependent rather than affinity-based low DHP sensitivity — and showed exon 8A is required for functional expression.\",\n      \"evidence\": \"Whole-cell patch-clamp of cloned human α1D splice variants in tsA-201 cells plus radioligand binding\",\n      \"pmids\": [\"11285265\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address in vivo physiological role\", \"Structural basis of negative-voltage activation unresolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Showed neuroendocrine CaV1.3 is stimulated rather than inhibited by Gi/Go-coupled GPCRs via a PKC-dependent mechanism, distinguishing its GPCR modulation from CaV2.2.\",\n      \"evidence\": \"Xenopus oocyte expression with voltage-clamp and pharmacological inhibitors\",\n      \"pmids\": [\"11435619\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phosphorylation site not mapped here\", \"Native cell relevance untested\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Genetic knockout established CaV1.3 as essential for cardiac pacemaking and for cochlear inner hair cell maturation and exocytosis, linking the channel to two distinct physiological systems.\",\n      \"evidence\": \"Cav1.3 KO mice; SAN and IHC patch-clamp; caged-Ca²⁺ photolysis; developmental immunohistochemistry\",\n      \"pmids\": [\"12700358\", \"14645476\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream effectors of pacemaking not yet defined\", \"Molecular basis of IHC maturation requirement unclear\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Resolved how CaV1.3 is anchored and clustered at synapses, showing its C-terminal PDZ-binding and proline-rich motifs bind Shank PDZ and SH3 domains and are required for synaptic clustering, GPCR modulation, and pCREB signaling.\",\n      \"evidence\": \"Yeast two-hybrid, GST pull-down, neuronal expression with dominant-negative peptides and DHP-resistant mutants; patch-clamp with PDZ-competing peptides and CaV1.3 KO\",\n      \"pmids\": [\"15689539\", \"15689540\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of the CaV1.3–Shank–Homer complex unresolved\", \"Whether clustering requires additional scaffolds untested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrated nanodomain Ca²⁺ control of hair-cell exocytosis, with ~80 CaV1.3 channels per ribbon active zone and a few nearby channels gating vesicle release.\",\n      \"evidence\": \"Nonstationary fluctuation analysis, immunohistochemistry, and capacitance recordings in IHCs\",\n      \"pmids\": [\"16354915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physical channel–vesicle tethering molecules not identified here\", \"Active-zone architecture not resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified bidirectional kinase control of CaV1.3 — PKA increases current while PKC phosphorylation at N-terminal S81 (isozyme-selective) decreases it.\",\n      \"evidence\": \"Heterologous patch-clamp with 8-Br-cAMP/PKI, S81D phosphomimetic, competing peptide, and isozyme-selective PKC activators; phospho-Western blot\",\n      \"pmids\": [\"15615842\", \"16973824\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PKA phosphoacceptor residue not precisely mapped\", \"In vivo physiological context of S81 regulation untested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined an IGF-1/PLC/IP3/CaMKII signaling cascade that phosphorylates EF-hand residue S1486 to potentiate CaV1.3 and drive CREB phosphorylation, linking channel modulation to gene expression.\",\n      \"evidence\": \"S1486A mutagenesis, pathway pharmacology, patch-clamp, and pCREB immunofluorescence in neurons\",\n      \"pmids\": [\"16763033\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct CaMKII–S1486 phosphorylation not biochemically confirmed\", \"Endogenous trigger in vivo undefined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Established physical and functional coupling of CaV1.3 to RyR2 and to CaBP1, connecting the channel to intracellular Ca²⁺ release and to anomalous inactivation control.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP from hippocampus, siRNA knockdown; patch-clamp in IHCs and transfected cells with CaBP1\",\n      \"pmids\": [\"17823125\", \"17947313\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"RyR2 interaction not reconstituted in vitro\", \"Direct CaBP1 binding site mapping incomplete\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified the C-terminal modulatory domain (CTM) as an intramolecular regulator of gating and CaM binding, generated by alternative splicing of the C-terminus.\",\n      \"evidence\": \"Patch-clamp of truncations, CTM-peptide rescue, and FRET in HEK-293 cells\",\n      \"pmids\": [\"18482979\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic structure of the CTM interaction unresolved\", \"In vivo isoform ratios not quantified here\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed otoferlin binds the CaV1.3 II-III loop in a Ca²⁺-dependent manner and that a DFNB9 mutation disrupts this, linking the channel to hair-cell synaptic vesicle machinery.\",\n      \"evidence\": \"GST pull-down with DFNB9 fusion proteins and Kd determination\",\n      \"pmids\": [\"19004828\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interaction not validated in native IHCs\", \"Functional consequence on exocytosis inferred, not measured\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Placed CaV1.3 in the retinal Usher protein network by demonstrating whirlin binding to its C-terminal PDZ motif and co-localization at photoreceptor cilium and synapse.\",\n      \"evidence\": \"Yeast two-hybrid, GST pull-down, co-IP, immuno-EM in retina\",\n      \"pmids\": [\"19959638\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of CaV1.3 in photoreceptors not established\", \"Single-lab interaction data\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Connected CaV1.3 to human disease for the first time, showing a loss-of-function insertion causes non-conducting channels and SANDD syndrome matching the KO mouse.\",\n      \"evidence\": \"Positional cloning with heterologous expression and patch-clamp of mutant channel\",\n      \"pmids\": [\"21131953\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Limited number of affected families\", \"Tissue-specific severity determinants unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined complexes conferring facilitation and active-zone properties: densin/CaMKII enables Ca²⁺-dependent facilitation, and RIM proteins binding the β-subunit slow inactivation to generate the IHC window current.\",\n      \"evidence\": \"Co-IP from brain, HEK293 reconstitution, dominant-negative CaMKII, domain mapping; tsA-201 patch-clamp with RIM co-localization\",\n      \"pmids\": [\"20392935\", \"20363327\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"RIM–CaV1.3 contact is indirect (via β-subunit)\", \"In vivo facilitation contribution not quantified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established harmonin as a dual regulator that limits CaV1.3 availability via ubiquitin-dependent degradation and, through dCT binding, enhances voltage-dependent facilitation and synchronous IHC exocytosis.\",\n      \"evidence\": \"Co-IP, IHC immunolocalization, ubiquitin pathway assays; patch-clamp and capacitance in dfcr mutant IHCs with domain deletion\",\n      \"pmids\": [\"21822269\", \"23613530\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase mediating degradation not identified\", \"Balance between degradation and facilitation roles unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Mapped how alternative splicing at multiple C-terminal loci tunes inactivation, expanding the repertoire of functionally distinct CaV1.3 isoforms.\",\n      \"evidence\": \"Transcript-scanning, splice-variant antibodies, and patch-clamp of each HEK-expressed variant\",\n      \"pmids\": [\"21998309\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Tissue distribution of each variant incompletely defined\", \"Physiological role of individual variants untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined CaV1.3 gain-of-function disease mechanism, showing somatic and germline mutations at Gly403/Ile770 shift activation and impair inactivation to cause aldosterone-producing adenomas and primary aldosteronism with neuromuscular features.\",\n      \"evidence\": \"Mutation identification with heterologous electrophysiology\",\n      \"pmids\": [\"23913001\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking Ca²⁺ influx to aldosterone production not detailed\", \"Neuromuscular phenotype mechanism unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Revealed RNA editing as a post-transcriptional tuner of CDI, acting by weakening apoCaM pre-binding rather than Ca²⁺/CaM binding, making inactivation responsive to ambient CaM.\",\n      \"evidence\": \"Electrophysiology of edited vs unedited channels with CaM binding assays in HEK cells and substantia nigra neurons\",\n      \"pmids\": [\"24120865\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo editing levels across tissues not mapped here\", \"Functional consequence for neuronal excitability not directly tested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified a CaV1.3–GABABR2 interaction in which GABAB activation selectively increases CaV1.3 current, defining a receptor–channel signaling unit.\",\n      \"evidence\": \"Yeast two-hybrid, GST pull-down, co-IP, co-localization, patch-clamp, and Ca²⁺ imaging\",\n      \"pmids\": [\"20627102\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Native physiological context untested\", \"Single-lab data\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended CaV1.3 gain-of-function disease to autism spectrum disorder via de novo mutations enhancing Ca²⁺ influx, and uncovered opposing CDI/VDI effects of one autism allele.\",\n      \"evidence\": \"Patch-clamp of patient-derived mutant channels in tsA-201/HEK cells with allosteric gating modeling\",\n      \"pmids\": [\"25620733\", \"27255217\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Neuronal/behavioral consequences not modeled in vivo\", \"Single-lab electrophysiology\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated a non-canonical role: the CaV1.3 C-terminal domain translocates to the nucleus in a Ca²⁺-dependent manner to act as a transcriptional regulator of SK2 channel expression.\",\n      \"evidence\": \"CaV1.3 null mice, nuclear fractionation, reporter assays, and co-IP\",\n      \"pmids\": [\"25538241\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"DNA-binding partners of the C-terminal fragment unknown\", \"Cleavage mechanism generating the fragment undefined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined the CTM mechanistically as a regulator of voltage-sensor-to-gate coupling, and showed CaV1.3 in dopamine neurons supports homeostatic D2-autoreceptor tuning via an NCS-1/GIRK2 network.\",\n      \"evidence\": \"Simultaneous gating- and ionic-current measurements of splice variants; brain-slice electrophysiology with genetic/pharmacological tools\",\n      \"pmids\": [\"24703308\", \"24934288\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of CTM-mediated coupling unresolved\", \"Direct CaV1.3–NCS-1 contact not demonstrated\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Confirmed in vivo, cell-type-specific CTM function and that RIM2 promotes synaptic CaV1.3 channel abundance required for sound-onset encoding.\",\n      \"evidence\": \"CTM-tagged knockin mice with IHC/chromaffin patch-clamp; hair-cell-specific RIM2 deletion with superresolution microscopy, Ca²⁺ imaging, and electron tomography\",\n      \"pmids\": [\"26379493\", \"26034270\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of RIM2-dependent channel recruitment incompletely defined\", \"CTM regulation in other cell types untested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established that CaV1.3 triggers and synchronizes RyR-dependent local Ca²⁺ release to control sinoatrial automaticity, with caffeine-induced CICR rescuing pacemaking in KO cells.\",\n      \"evidence\": \"Ca²⁺ imaging and AP-clamp in Cav1.3-/- SAN cells and ex vivo preparations with functional rescue\",\n      \"pmids\": [\"26786159\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatial relationship of CaV1.3 to RyR in SAN not directly imaged\", \"Quantitative contribution vs. surface-membrane clock unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed the α2δ subunit co-assembles with CaV1.3 at IHC presynapses, supporting current amplitude, gating, exocytosis, and trans-synaptic alignment with postsynaptic AMPA receptors.\",\n      \"evidence\": \"Patch-clamp, exocytosis measurements, immunofluorescence, and ABR in α2δ2-null (ducky) mice\",\n      \"pmids\": [\"27798183\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of trans-synaptic alignment unclear\", \"Whether α2δ directly mediates clustering untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended the gain-of-function disease spectrum with activation-gate mutation V401L producing enhanced current and hyperpolarized gating in both splice backgrounds while retaining isradipine sensitivity.\",\n      \"evidence\": \"Whole-cell patch-clamp of mutant channel complexes in tsA-201 cells\",\n      \"pmids\": [\"28472301\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo consequence not modeled\", \"Single-lab data\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined the molecular basis of tissue-selective IQ-domain editing, showing an exon41–intron RNA duplex (ECS) and SRSF9 control ADAR2 access, with neuronal SRSF9 down-regulation enabling neuron-specific editing.\",\n      \"evidence\": \"Minigene assays with ADAR2, SRSF9 overexpression/knockdown, RNA–protein interaction assays, and evolutionary analysis\",\n      \"pmids\": [\"29733375\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo editing regulation by SRSF9 not confirmed\", \"Other splice-editing crosstalk loci untested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Distinguished gain- versus loss-of-function as the disease determinant at residue S652, showing only the hyperpolarizing GOF variant (S652L) increases window currents and Ca²⁺ load and confers high disease risk.\",\n      \"evidence\": \"Comparative whole-cell patch-clamp of S652L vs S652W mutant channel complexes in tsA-201 cells\",\n      \"pmids\": [\"31921405\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Genotype–phenotype correlation across patients incomplete\", \"Therapeutic relevance of increased isradipine sensitivity untested in vivo\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CaV1.3 macromolecular complexes are assembled and spatially organized into cell-type-specific signaling units (cardiac, cochlear, neuronal), and the structural basis of CTM-mediated gating and CaM/editing tuning, remain to be resolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No atomic structure of CaV1.3 with its scaffolds/auxiliary subunits in the corpus\", \"Mechanism generating and targeting the nuclear C-terminal fragment unknown\", \"In vivo integration of kinase, editing, and splicing regulation not unified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 36]},\n      {\"term_id\": \"GO:0005262\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 11, 25]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [24]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 3, 26, 30]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [24]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [35]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0099537\", \"supporting_discovery_ids\": [3, 26, 30]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [1, 29]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [4, 5, 28]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 7, 8, 21]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [13, 19, 23, 34]}\n    ],\n    \"complexes\": [\n      \"CaV1.3 L-type channel (α1D/β/α2δ)\",\n      \"postsynaptic density CaV1.3–Shank–Homer complex\",\n      \"IHC ribbon-synapse active zone (CaV1.3–RIM2–harmonin)\",\n      \"CaV1.3–densin–CaMKII complex\"\n    ],\n    \"partners\": [\n      \"SHANK\",\n      \"RIMS2\",\n      \"USH1C\",\n      \"OTOF\",\n      \"RYR2\",\n      \"GABBR2\",\n      \"CABP1\",\n      \"WHRN\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}