{"gene":"CACNA1C","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2001,"finding":"The β2 adrenergic receptor forms a direct macromolecular signaling complex with Cav1.2, also containing a G protein, adenylyl cyclase, PKA, and PP2A, enabling highly localized and specific signal transduction from receptor to channel in hippocampal neurons.","method":"Co-immunoprecipitation, electrophysiology in hippocampal neurons","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP identifying multiple complex components plus functional electrophysiological validation in native neurons; widely replicated across subsequent studies","pmids":["11441182"],"is_preprint":false},{"year":2004,"finding":"PKC isoforms form a macromolecular complex with the α1c subunit of Cav1.2 via direct interaction with the C-terminus, and phosphorylate Ser1928 both in vitro and in vivo, the same residue phosphorylated by PKA, indicating convergence of PKA and PKC signaling on Cav1.2 at Ser1928.","method":"In vitro kinase assay, Co-immunoprecipitation, site-directed mutagenesis, metabolic labeling in intact cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro phosphorylation assay with identified site, in vivo confirmation, multiple orthogonal methods in single rigorous study","pmids":["15509562"],"is_preprint":false},{"year":2003,"finding":"Apocalmodulin (apoCaM) binds with higher affinity to the C-IQ region of Cav1.2 than to the IQ peptide alone; Ca2+-CaM binds all three C-terminal regions (A, C, IQ); binding to IQ and C peptides increases Ca2+ affinity of the C-lobe of CaM; apoCaM binding to the IQ motif is necessary for rapid Ca2+ binding to the C-lobe and subsequent Ca2+-dependent inactivation. Double mutation of IQ motif residues reduces apoCaM interaction.","method":"Fluorescence binding assays, peptide competition assays, site-directed mutagenesis of IQ motif in channel","journal":"Biophysical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutagenesis, multiple peptide/binding assays in single study","pmids":["12944271"],"is_preprint":false},{"year":2004,"finding":"CaBP1 (Ca2+-binding protein-1) directly interacts with the α1 subunit of Cav1.2 at IQ domain and other CaM-binding sites; IQ binding is Ca2+-dependent and competitive with CaM. CaBP1 co-purifies with Cav1.2 in postsynaptic density fractions from rat brain and colocalizes in neuronal dendrites. CaBP1 prevents Ca2+-dependent inactivation and causes Ca2+-dependent facilitation of Cav1.2 currents, contrasting with CaM's promotion of inactivation.","method":"Co-immunoprecipitation, postsynaptic density fractionation, double-label immunofluorescence, whole-cell electrophysiology in transfected cells","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP in native tissue plus functional electrophysiology with orthogonal localization data","pmids":["15140941"],"is_preprint":false},{"year":2005,"finding":"Conditional knockout of Cav1.2 (CACNA1C) in hippocampus and neocortex selectively abolishes protein synthesis-dependent, NMDAR-independent late-phase LTP (L-LTP) at Schaffer collateral/CA1 synapses, impairs hippocampus-dependent spatial memory, and decreases MAPK pathway activation and CRE-dependent transcription in CA1 pyramidal neurons.","method":"Conditional knockout mouse (Cav1.2 HCKO), electrophysiology (LTP recording), spatial memory behavioral assays, biochemical signaling assays","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean conditional KO with multiple orthogonal readouts (LTP, behavior, biochemistry) in single study","pmids":["16251435"],"is_preprint":false},{"year":2007,"finding":"Protein kinase G (PKGIα) phosphorylates specific residues within both the α1c and β2a subunits of Cav1.2 in vitro and in intact HEK cells and cardiac myocytes; PKG-mediated inhibition of Cav1.2 whole-cell current is significantly reduced by alanine substitution of Ser496 on the β2a subunit.","method":"In vitro kinase assay, phospho-epitope-specific antibodies, whole-cell patch clamp, site-directed mutagenesis","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro assay plus mutagenesis plus electrophysiology in multiple cell types in single rigorous study","pmids":["17626895"],"is_preprint":false},{"year":2009,"finding":"Fox family splicing regulators (Fox1 and Fox2) directly control alternative splicing of CaV1.2 exons 9* and 33 during cortical development: Fox proteins repress exon 9* inclusion and enhance exon 33 inclusion via binding elements in adjacent introns, generating splice variants with distinct electrophysiological properties.","method":"siRNA knockdown, overexpression of Fox1/Fox2, minigene reporter assays, RT-PCR of endogenous CaV1.2 mRNA in cortical neurons","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (KD, OE, minigene reporters, mutagenesis of binding elements) establishing direct regulatory mechanism","pmids":["19564422"],"is_preprint":false},{"year":2009,"finding":"NMDA receptor activation causes internalization and lysosomal degradation of CaV1.2 channels through binding to PIKfyve (phosphatidylinositol 3-phosphate 5-kinase), which generates PtdIns(3,5)P2 and promotes CaV1.2 targeting to lysosomes; PIKfyve knockdown prevents CaV1.2 degradation and increases neuronal susceptibility to excitotoxicity.","method":"Immunoprecipitation, live imaging, siRNA knockdown, biochemical fractionation, toxicity assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying binding partner, KD with defined functional phenotype (excitotoxicity), multiple orthogonal readouts","pmids":["19841139"],"is_preprint":false},{"year":2009,"finding":"α2δ-1 is the sole α2δ isoform in cerebral artery myocytes, is essential for plasma membrane expression of Cav1.2 α1 subunits, and directly regulates CaV1.2 current; α2δ-1 knockdown reduces surface Cav1.2, decreases intracellular Ca2+ concentration, and inhibits pressure-induced vasoconstriction (myogenic tone).","method":"Surface biotinylation, shRNA knockdown, patch-clamp electrophysiology, pressurized vessel myography, confocal microscopy","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (biotinylation, shRNA, electrophysiology, myography) with clear functional consequence","pmids":["19797702"],"is_preprint":false},{"year":2010,"finding":"CaMKII binding to β2a subunit residue Leu493 and phosphorylation of Thr498 are required for CaV1.2 to enter a high-activity gating mode (mode 2); expression of T498A or L493A β2a mutants reduces Ca2+ entry through Cav1.2, inhibits early afterdepolarizations (EADs), and improves cardiomyocyte survival in CaMKII-overloaded conditions.","method":"Site-directed mutagenesis, patch-clamp electrophysiology (single-channel and whole-cell), adenoviral overexpression in adult rabbit ventricular myocytes, cell survival assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis of specific residues with in vitro electrophysiology confirming gating mode, functional cardiac phenotype readout","pmids":["20194790"],"is_preprint":false},{"year":2010,"finding":"Rem GTPase inhibits Cav1.2 in heart primarily by arresting surface channels in a low open-probability gating mode (not by reducing channel trafficking); this inhibition requires GTP-binding but not membrane targeting, and Rem-inhibited channels cannot be rescued by PKA-dependent phosphorylation but can be rescued by Bay K 8644.","method":"Patch-clamp electrophysiology (whole-cell and gating charge measurements), overexpression in adult guinea pig cardiomyocytes, dominant-negative and chimeric Rem mutants","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — gating charge measurements plus mutagenesis plus pharmacological rescue in native cardiomyocytes, rigorous mechanistic dissection","pmids":["20616312"],"is_preprint":false},{"year":2010,"finding":"Increasing L-type Ca2+ influx through Cav1.2 (via β2a subunit overexpression) is sufficient to induce pathological cardiomyocyte hypertrophy through calcineurin/NFAT and CaMKII/HDAC signaling pathways; both cytosolic and SR/ER-nuclear envelope Ca2+ pools are involved.","method":"Transgenic mouse models with β2a overexpression, adenoviral overexpression in cultured cardiomyocytes, L-type channel blockade, calcineurin/CaMKII inhibition, NFAT/HDAC translocation assays","journal":"Journal of molecular and cellular cardiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic and pharmacological approaches with defined pathway placement (calcineurin/NFAT, CaMKII/HDAC) in vivo and in vitro","pmids":["21111744"],"is_preprint":false},{"year":2010,"finding":"IP3R-mediated SR Ca2+ release elevates mitochondrial [Ca2+], induces mitochondrial ROS generation, which activates NF-κB to stimulate CaV1.2 channel transcription in arterial myocytes, thereby modulating vasoconstriction.","method":"Mitochondrial Ca2+ imaging, ROS measurements, NF-κB reporter assays, siRNA knockdown, qRT-PCR, patch-clamp, pressurized myography","journal":"Circulation research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal assays in single lab establishing transcriptional control pathway, but complex indirect chain","pmids":["20616314"],"is_preprint":false},{"year":2011,"finding":"BIN1 (bridging integrator 1) traffics Cav1.2 to cardiac T-tubules; BIN1 is significantly reduced in failing human cardiomyocytes, and this reduction impairs Cav1.2 trafficking to T-tubules, reduces surface Ca2+ current, and impairs calcium transients and contractility.","method":"Confocal imaging of human failing/non-failing myocytes, T-tubule biochemical fractionation, patch clamp, shRNA knockdown in mouse cardiomyocytes, zebrafish morpholino knockdown","journal":"Heart rhythm","confidence":"High","confidence_rationale":"Tier 2 / Strong — human tissue plus mouse KD plus zebrafish model, multiple orthogonal methods establishing trafficking mechanism with functional consequence","pmids":["22138472"],"is_preprint":false},{"year":2013,"finding":"Ca2+ influx through CaV1.2 regulates jaw/mandible development by controlling cellular hypertrophy and hyperplasia via the calcineurin signaling pathway in jaw primordium cells; CaV1.2 is expressed in first and second pharyngeal arch cells.","method":"Gain-of-function and loss-of-function mouse models, zebrafish knockdown/rescue, pharmacological blockade, calcineurin pathway assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple species, genetic and pharmacological approaches, pathway identified (calcineurin), replication across model systems","pmids":["23549079"],"is_preprint":false},{"year":2013,"finding":"Timothy syndrome (TS) gain-of-function mutation G406R in Cav1.2 acts in a dominant-negative manner in hair follicle stem cells to delay anagen; Cav1.2 regulates production of the BMP inhibitor follistatin-like1 (Fstl1) from the bulge to derepress stem cell quiescence. This occurs in the absence of detectable voltage-dependent Ca2+ currents in these non-excitable cells.","method":"Transgenic mouse expressing TS-Cav1.2, L-type channel blocker treatment, Fstl1 expression analysis, hair follicle stem cell assays","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacological approaches in vivo with downstream target (Fstl1) identified, single lab","pmids":["23752588"],"is_preprint":false},{"year":2014,"finding":"Phosphorylation of Ser1700 on Cav1.2 is essential for maintaining basal L-type Ca2+ current in cardiomyocytes and for the incremental increase by β-adrenergic receptor stimulation (isoproterenol); Ser1700Ala knock-in mice develop cardiac hypertrophy and have reduced stress-induced exercise tolerance.","method":"Knock-in mouse model (S1700A), patch-clamp electrophysiology in neonatal and adult cardiomyocytes, in vivo cardiac function assays, exercise testing","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo knock-in mutagenesis with electrophysiology and physiological phenotyping, rigorous mechanistic study","pmids":["25368181"],"is_preprint":false},{"year":2016,"finding":"Phosphorylation of Cav1.2 Ser1928 by PKA, within the β2AR binding site (residues 1923-1942), displaces the β2AR from Cav1.2 upon β-adrenergic stimulation, rendering Cav1.2 refractory to further β-adrenergic stimulation for several minutes; this effect is lost in S1928A knock-in mice. Long-term potentiation induced by prolonged theta tetanus requires Cav1.2 and its regulation by channel-associated β2AR.","method":"S1928A knock-in mice, Co-immunoprecipitation, electrophysiology (patch clamp and LTP recording), β-adrenergic stimulation assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo knock-in plus Co-IP plus electrophysiology establishing a specific desensitization mechanism with multiple orthogonal validations","pmids":["27103070"],"is_preprint":false},{"year":2016,"finding":"Deletion of cacna1c in the adult mouse prefrontal cortex produces antidepressant-like effects and reduces REDD1 protein levels; REDD1 overexpression in the PFC of cacna1c heterozygous mice reverses the antidepressant-like phenotype and is associated with lower phospho-Akt (S473) and higher nuclear FoxO3a levels.","method":"Viral vector-mediated conditional knockout, behavioral assays (SPT, FST, TST), molecular signaling assays (REDD1, Akt, FoxO3a)","journal":"Neuropsychopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — viral KO with rescue experiment identifying REDD1-FoxO3a pathway, multiple behavioral readouts, single lab","pmids":["27922594"],"is_preprint":false},{"year":2016,"finding":"NFAT5 binds to a consensus sequence (TGGAAGCGTTC) in the promoter of Cacna1c and activates its transcription; siRNA-mediated NFAT5 knockdown suppresses Cacna1c expression and decreases L-type Ca2+ current in mouse neonatal cardiomyocytes; morpholino knockdown of nfat5 in zebrafish prevents cacna1c expression and results in non-contractile ventricle, rescued by overexpression of either cacna1c or nfat5.","method":"Promoter analysis, ChIP/binding assay, siRNA knockdown, patch clamp, zebrafish morpholino knockdown with rescue","journal":"Journal of molecular medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct promoter binding identified, cross-species validation with rescue experiment, multiple orthogonal methods","pmids":["27368804"],"is_preprint":false},{"year":2017,"finding":"Increased Ca2+ influx through CaV1.2 in osteoblasts activates osteogenic transcriptional programs, promotes mineralization, and inhibits osteoclast activity through increased osteoprotegerin secretion; CaV1.2 is expressed in proliferating chondrocytes and osteoblasts in developing bone.","method":"Transgenic gain-of-function CaV1.2 mutant mice (Prx1-, Col2a1-, Col1a1-Cre), BMSC primary cultures, osteoprotegerin assays, ovariectomy bone-loss model","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo transgenic plus primary cell culture with downstream pathway (osteoprotegerin), single lab","pmids":["29202453"],"is_preprint":false},{"year":2018,"finding":"Membrane depolarization triggers nuclear signaling (c-Fos and MeCP2 activation via Ras/ERK/CREB pathway) through Cav1.2 in a Ca2+-influx-independent manner; this requires the intracellular β2 subunit's interaction with H-Ras and is dependent on Ca2+ occupancy of the open channel pore but not Ca2+ transport. Loss of α1-β2 interaction (W440A mutation) or absence of β2 abolishes nuclear signaling.","method":"Mutagenesis (Ca2+-impermeable channel α1L745P, CaM-binding disrupting α1I1624A, α1W440A), pulldown assays with recombinant H-Ras and β2, transfection in HEK293 and SH-SY5Y cells, reporter assays for c-Fos/MeCP2","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple channel mutants plus in vitro binding reconstitution establishing Ca2+-independent nuclear signaling mechanism","pmids":["30150369"],"is_preprint":false},{"year":2019,"finding":"CaV1.2 β subunits are dispensable for channel trafficking to the sarcolemma in adult cardiomyocytes but are required for β-adrenergic regulation of Cav1.2 and positive inotropy; transgenic α1C lacking the β-subunit binding site traffics normally but cannot be stimulated by isoproterenol.","method":"Transgenic mouse expressing β-binding-deficient α1C, patch clamp, contractility assays in isolated cardiomyocytes and intact heart, viral β-subunit-sequestering peptide","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo transgenic plus viral pharmacology in adult cardiomyocytes, clear separation of trafficking from adrenergic regulation","pmids":["30422117"],"is_preprint":false},{"year":2019,"finding":"TDP-43 regulates CaV1.2 expression in pancreatic β cells; TDP-43 loss (nuclear depletion) downregulates CaV1.2 and inhibits exocytosis, reducing early-phase insulin secretion; overexpression of CaV1.2 restores early-phase insulin secretion in Tardbp-knockdown MIN6 cells.","method":"β cell-specific Tardbp knockout mice, MIN6 cell siRNA knockdown, CaV1.2 overexpression rescue, insulin secretion assays, exocytosis measurements","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO plus rescue with CaV1.2 overexpression in both cell line and in vivo model, clear functional phenotype","pmids":["31355778"],"is_preprint":false},{"year":2019,"finding":"Estrogen receptor α (ERα) promotes Cav1.2 ubiquitination and proteasomal degradation in neurons via K29-linked ubiquitin chains and the E3 ligase Mdm2, utilizing the PEST sequence in Cav1.2; ERα agonist administration reduces cerebral Cav1.2 protein and increases Cav1.2 ubiquitination in OVX APP/PS1 mice.","method":"Ubiquitin mutant (K29R), TRABID overexpression, Mdm2 overexpression, MG132 proteasome inhibitor, in vivo ERα agonist (PPT) treatment, immunofluorescence colocalization in vivo","journal":"Aging cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple mechanistic tools (UB mutants, E3 ligase OE, proteasome inhibitor) in single lab identifying degradation pathway","pmids":["31012223"],"is_preprint":false},{"year":2020,"finding":"Ketamine directly inhibits Cav1.2 calcium channels and blocks Cav1.2-mediated induction of immediate early genes and transcription factors in smooth muscle; Cav1.2-specific inactivation in smooth muscle mimics the ketamine cystitis phenotype, and Cav1.2 agonist Bay K 8644 reverses ketamine-induced smooth muscle dysfunction.","method":"Patch-clamp electrophysiology, smooth muscle-specific Cav1.2 conditional knockout, pharmacological rescue with Bay K 8644, gene expression assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — direct electrophysiological demonstration of channel block plus genetic KO phenocopy plus pharmacological rescue in single rigorous study","pmids":["32859919"],"is_preprint":false},{"year":2015,"finding":"Homer proteins mediate the physical interaction between STIM1 and the Cav1.2 α1 subunit; store depletion (thapsigargin) induces co-immunoprecipitation of Homer1 with STIM1 and Cav1.2 α1; disruption of Homer function (PPKKFR peptide or siRNA Homer1) reduces STIM1-Cav1.2 association and enhances nifedipine-sensitive Ca2+ entry through Cav1.2.","method":"Co-immunoprecipitation, siRNA knockdown of Homer1, dominant-negative PPKKFR peptide, Ca2+ imaging in HEK-293 cells expressing Cav1.2 subunits","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying complex plus two orthogonal disruption approaches (peptide and siRNA), single lab","pmids":["25712868"],"is_preprint":false},{"year":2010,"finding":"Rab25 GTPase co-localizes with Cav1.2 in cerebral artery myocytes and is required for surface expression of Cav1.2 channels; Rab25 knockdown reduces both surface and intracellular Cav1.2 abundance through lysosomal and proteasomal degradation, decreases whole-cell CaV1.2 current, and inhibits pressure-induced vasoconstriction.","method":"immunoFRET microscopy, surface biotinylation, siRNA knockdown, patch-clamp electrophysiology, pressurized myography","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRET-based spatial proximity plus siRNA with functional readout, single lab","pmids":["27076616"],"is_preprint":false},{"year":2010,"finding":"α5β1-integrin engagement by fibronectin acutely enhances Cav1.2 current and forms a macromolecular complex with Cav1.2; co-association requires cell adhesion to fibronectin and Cav1.2 C-terminal residues Ser1901, Tyr2122, and two proline-rich domains; phosphorylation at Y2122 and/or S1901 and c-Src binding to PRDs mediate current potentiation.","method":"Co-immunoprecipitation, site-directed mutagenesis of Cav1.2, patch-clamp electrophysiology, confocal immunofluorescence","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus mutagenesis plus electrophysiology, single lab","pmids":["21178109"],"is_preprint":false},{"year":2004,"finding":"Smooth muscle-specific knockout of Cav1.2 (SMACKO) abolishes L-type calcium current, protein, and spontaneous contractile activity in the bladder; K+- and carbachol-induced contractions are reduced ~10-fold; Rho-kinase and Ca2+-release pathways cannot compensate for the absence of Cav1.2. CCh-induced contraction requires extracellular Ca2+ but not PLC or intracellular Ca2+ stores.","method":"Smooth muscle-specific conditional knockout mouse, electrophysiology, contractility assays, pharmacological dissection","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic KO with multiple pharmacological controls defining Cav1.2 as essential for bladder smooth muscle contraction","pmids":["15132976"],"is_preprint":false},{"year":2009,"finding":"KChIP2 directly interacts with the amino-terminus of CaV1.2 (confirmed by co-immunoprecipitation) and functionally modulates the cardiac L-type Ca2+ current; KChIP2 knockout mice show decreased ICa,L and compensatory transcriptional upregulation of the calcium channel β2 subunit (CACNB2).","method":"Co-immunoprecipitation, patch-clamp electrophysiology, gene-chip and real-time PCR in KChIP2(-/-) mice","journal":"Channels (Austin, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP confirming interaction plus KO electrophysiology, single lab","pmids":["19713767"],"is_preprint":false},{"year":2013,"finding":"PKC-dependent activation of Cav1.2 channels selectively controls human TH2 lymphocyte Ca2+ entry and cytokine responses; Cav1.2 is selectively expressed and maintained in TH2 but not TH1 or TH9 cells; both nicardipine and Cav1.2-specific antisense oligonucleotides decrease Ca2+ and cytokine responses in TH2 cells.","method":"Flow cytometry, antisense oligonucleotide knockdown, PKC inhibition/activation, Ca2+ imaging, cytokine assays in primary human T cells","journal":"The Journal of allergy and clinical immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with antisense plus pharmacological approach in primary human cells, single lab","pmids":["24365142"],"is_preprint":false},{"year":2016,"finding":"Forebrain-specific conditional knockout of cacna1c in adult mice improved cognitive flexibility and strengthened synaptic plasticity, while embryonic deletion caused cognitive decline, impaired synaptic plasticity, reduced sociability, hyperactivity, and increased anxiety-like behavior, demonstrating a differential developmental vs adult role for Cav1.2.","method":"Conditional knockout (embryonic vs. adult timing using inducible Cre), synaptic plasticity recordings, behavioral phenotyping, chronic stress exposure","journal":"Molecular psychiatry","confidence":"High","confidence_rationale":"Tier 2 / Strong — temporally controlled genetic approach dissecting developmental from adult function using multiple behavioral and electrophysiological readouts","pmids":["28696432"],"is_preprint":false},{"year":2016,"finding":"Cacna1c deletion specifically in nucleus accumbens neurons increases susceptibility to social defeat stress; reduced Cacna1c expression in nucleus accumbens is causally associated with maladaptive outcomes after chronic social defeat.","method":"Viral Cre-mediated conditional knockout in nucleus accumbens of floxed Cacna1c mice, social interaction and female urine preference assays","journal":"The international journal of neuropsychopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — region-specific viral KO with behavioral phenotyping, single lab","pmids":["28165117"],"is_preprint":false},{"year":2016,"finding":"Cacna1c forebrain knockout mice exhibit enhanced death of young hippocampal neurons (without change in NPC proliferation) and deficits in brain BDNF levels; adult hippocampal Cre-mediated knockdown of Cav1.2 recapitulates the survival deficit.","method":"Forebrain-specific conditional knockout, BrdU/Ki67 labeling, TUNEL/survival assays, BDNF measurement, viral Cre knockdown in adults","journal":"eNeuro","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO plus viral adult KD with defined cellular phenotype (neuronal survival), single lab","pmids":["27066530"],"is_preprint":false},{"year":2018,"finding":"Cacna1c knockout specifically in serotonin (5-HT) neurons disrupts active-coping behavior in the forced swim test; this is rescued by blocking 5-HT1A receptors; Cacna1c knockout mice show enhanced Fos expression in caudal DR 5-HT neurons and enhanced response to a 5-HT1A antagonist in rostral DR neurons, indicating disrupted 5-HT neuron activation and 5-HT1A feedback inhibition.","method":"5-HT neuron-specific conditional Cacna1c knockout (temporally controlled), forced swim test, c-Fos immunohistochemistry, pharmacological rescue with WAY-100635","journal":"Neuropharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific KO with pharmacological rescue and neural activity markers, single lab","pmids":["30176250"],"is_preprint":false},{"year":2015,"finding":"Loss of Cav1.2 in the auditory brainstem (targeted embryonic deletion) causes significant decreases in auditory nuclei volume and cell number; action potentials of lateral superior olive neurons are narrower than controls; the medial nucleus of the trapezoid body undergoes rapid cell loss between P0 and P4.","method":"Conditional knockout mouse, electrophysiology of auditory brainstem neurons, volumetric and cell-count analysis, auditory brainstem response recordings","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic KO with multiple structural and electrophysiological readouts, single lab","pmids":["26242732"],"is_preprint":false},{"year":2023,"finding":"ANO1, CaV1.2, and IP3R co-assemble in a microdomain at or near the plasma membrane of pulmonary arterial smooth muscle cells (confirmed by co-immunoprecipitation and superresolution nanomicroscopy); this tripartite complex integrates stochastic Ca2+ release events and Ca2+ waves to sustain serotonin-induced arterial contraction.","method":"Co-immunoprecipitation, confocal and superresolution microscopy, smooth muscle-specific ANO1 ablation, pharmacological blockade of CaV1.2 and IP3R, Ca2+ imaging with GCaMP","journal":"The Journal of general physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying ternary complex plus orthogonal microscopy and genetic/pharmacological disruption in single study","pmids":["37702787"],"is_preprint":false},{"year":2024,"finding":"In layer III pyramidal cells of dorsolateral prefrontal cortex, Cav1.2 (CACNA1C) is concentrated in dendritic spines near calcium-storing smooth ER, co-expressed with GRIN2B and KCNN3 (SK3); L-type calcium channel activation drives SK3-mediated inhibition of firing; both blockade and excessive activation of L-type channels reduce neuronal firing needed for working memory.","method":"Electron and light microscopy of macaque dPFC, pharmacological blockade and activation of L-type channels during unit recording, working memory behavioral tasks, transcriptomic profiling of human and macaque pyramidal cells","journal":"JAMA psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by EM plus electrophysiology during behavior in primates, multiple orthogonal approaches in single study","pmids":["38776078"],"is_preprint":false},{"year":1991,"finding":"The human CACNA1C gene (encoding the α1 subunit of the cardiac dihydropyridine-sensitive Ca2+ channel, CCHL1A1) was mapped to chromosome 12p12-pter by PCR analysis of somatic cell hybrids.","method":"PCR of human-rodent somatic cell hybrids with human-specific oligonucleotides","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genomic localization by somatic cell hybrid mapping, foundational chromosomal assignment","pmids":["1653763"],"is_preprint":false}],"current_model":"CACNA1C encodes the pore-forming α1C subunit of the Cav1.2 L-type voltage-gated calcium channel, which functions as a hub for macromolecular signaling complexes (including β2AR, PKA, PKC, PKG, CaMKII, CaM/CaBP1, and scaffolding proteins such as AKAPs and BIN1) that tightly regulate channel gating, trafficking, and downstream signaling; key phosphorylation sites (Ser1700 and Ser1928) control basal activity and β-adrenergic regulation, while alternative splicing by Fox proteins tunes electrophysiological properties during development, and the channel drives Ca2+-dependent transcription (via calcineurin/NFAT, CaMKII/HDAC, and Ras/ERK/CREB pathways), neuronal survival, synaptic plasticity, excitation-contraction coupling in cardiac and smooth muscle, and diverse developmental processes including jaw morphogenesis and hippocampal neurogenesis."},"narrative":{"mechanistic_narrative":"CACNA1C encodes the pore-forming α1C subunit of the Cav1.2 L-type voltage-gated calcium channel, which serves as a Ca2+-entry hub and signaling scaffold that couples membrane depolarization to excitation-contraction coupling, neuronal plasticity, and Ca2+-dependent transcription [PMID:11441182, PMID:16251435, PMID:15132976]. Cav1.2 nucleates a macromolecular signaling complex in which a β2-adrenergic receptor, G protein, adenylyl cyclase, PKA and PP2A are physically tethered for local, specific regulation [PMID:11441182]; channel gating is tuned by convergent phosphorylation, with PKA and PKC both targeting Ser1928 on the α1C C-terminus [PMID:15509562], PKG phosphorylating α1C and the β2a subunit to inhibit current [PMID:17626895], and CaMKII binding the β2a subunit to drive a high-activity gating mode [PMID:20194790]. Two phosphosites partition basal from stimulated activity: Ser1700 maintains basal L-type current and supports β-adrenergic potentiation [PMID:25368181], while PKA phosphorylation of Ser1928 displaces the associated β2AR to render the channel refractory to further adrenergic stimulation [PMID:27103070], a regulation that itself requires the auxiliary β subunit binding site [PMID:30422117]. Ca2+/calmodulin and the related CaBP1 compete at the C-terminal IQ region to set Ca2+-dependent inactivation versus facilitation [PMID:12944271, PMID:15140941]. Channel abundance and surface delivery are controlled by auxiliary and trafficking proteins including α2δ-1, BIN1, Rab25, the PIKfyve/lysosomal and ERα/Mdm2 ubiquitin–proteasome degradation routes, and by alternative splicing through Fox proteins and transcriptional inputs from NFAT5 and TDP-43 [PMID:19564422, PMID:19841139, PMID:19797702, PMID:22138472, PMID:27368804, PMID:31355778, PMID:31012223, PMID:27076616]. Downstream, Cav1.2 Ca2+ influx — and in some contexts a Ca2+-flux-independent, β2-subunit/H-Ras-dependent route [PMID:30150369] — drives calcineurin/NFAT, CaMKII/HDAC, and Ras/ERK/CREB transcriptional programs governing cardiac hypertrophy, jaw and bone morphogenesis, smooth muscle contraction, hippocampal late-LTP and memory, and neuronal survival [PMID:16251435, PMID:21111744, PMID:23549079, PMID:29202453, PMID:15132976, PMID:27066530]. A gain-of-function G406R mutation underlies Timothy syndrome, acting dominantly even in non-excitable cells [PMID:23752588].","teleology":[{"year":1991,"claim":"Establishing the chromosomal locus of the cardiac dihydropyridine-sensitive Ca2+ channel α1 subunit gave the molecular anchor for all subsequent CACNA1C genetics.","evidence":"PCR mapping of human-rodent somatic cell hybrids","pmids":["1653763"],"confidence":"Medium","gaps":["No functional or expression data","Channel biology not yet addressed"]},{"year":2001,"claim":"It was unknown how β-adrenergic signals reach Cav1.2 with such speed and specificity; identifying a receptor-channel macromolecular complex showed signaling is hardwired by physical proximity.","evidence":"Reciprocal Co-IP and electrophysiology in hippocampal neurons identifying β2AR, G protein, adenylyl cyclase, PKA, PP2A on Cav1.2","pmids":["11441182"],"confidence":"High","gaps":["Stoichiometry and structural arrangement unresolved","Phosphosite specificity not defined here"]},{"year":2003,"claim":"How Cav1.2 senses its own Ca2+ flux was unclear; mapping apoCaM/Ca2+-CaM binding to the C-terminal IQ/A/C regions defined the molecular basis of Ca2+-dependent inactivation.","evidence":"Fluorescence and peptide competition binding assays with IQ-motif mutagenesis","pmids":["12944271"],"confidence":"High","gaps":["In vitro peptide system, not full channel context","Functional CDI tested indirectly"]},{"year":2004,"claim":"Convergence of kinase inputs was unknown; demonstrating PKC binds the C-terminus and phosphorylates Ser1928 — the same PKA site — revealed an integration node for distinct signaling pathways.","evidence":"In vitro kinase assay, Co-IP, site-directed mutagenesis, metabolic labeling in cells","pmids":["15509562"],"confidence":"High","gaps":["Physiological consequence of Ser1928 phosphorylation not yet defined","PKC isoform specificity partial"]},{"year":2004,"claim":"Whether a CaM relative could reverse channel feedback was untested; CaBP1 was shown to compete with CaM at the IQ motif and convert inactivation to facilitation, diversifying Ca2+ feedback.","evidence":"Co-IP, PSD fractionation, immunofluorescence, whole-cell electrophysiology","pmids":["15140941"],"confidence":"High","gaps":["Cell-type-specific roles unclear","Structural basis of competition not resolved"]},{"year":2004,"claim":"The requirement of Cav1.2 for smooth muscle contraction was inferred but not genetically proven; smooth-muscle KO established it as essential and non-redundant for bladder contractility.","evidence":"Smooth muscle-specific conditional KO with electrophysiology and contractility/pharmacology","pmids":["15132976"],"confidence":"High","gaps":["Compensatory pathways excluded only for bladder","Molecular coupling to contractile machinery not addressed"]},{"year":2005,"claim":"The role of Cav1.2 in long-term plasticity was unknown; conditional KO showed it is selectively required for protein-synthesis-dependent late-LTP, spatial memory, and CREB-dependent transcription.","evidence":"Hippocampus/cortex conditional KO with LTP, behavior, and biochemical signaling assays","pmids":["16251435"],"confidence":"High","gaps":["Mechanism linking channel to MAPK/CRE not fully mapped","Ca2+-flux vs scaffold contribution undistinguished"]},{"year":2007,"claim":"How cGMP signaling restrains Cav1.2 was unknown; PKGIα phosphorylation of α1C and β2a Ser496 was shown to inhibit current.","evidence":"In vitro kinase assay, phospho-specific antibodies, patch clamp, mutagenesis in HEK and myocytes","pmids":["17626895"],"confidence":"High","gaps":["In vivo cardiac significance not tested","Additional PKG sites not fully resolved"]},{"year":2009,"claim":"How channel electrophysiology is tuned developmentally was unclear; Fox1/Fox2 were shown to direct alternative splicing of exons 9* and 33, generating variants with distinct properties.","evidence":"siRNA/overexpression, minigene reporters, RT-PCR in cortical neurons","pmids":["19564422"],"confidence":"High","gaps":["Functional consequence of each variant in vivo incomplete","Other splice regulators not surveyed"]},{"year":2009,"claim":"Activity-dependent removal of Cav1.2 was uncharacterized; NMDAR-driven PIKfyve binding was shown to target the channel to lysosomes, linking degradation to excitotoxicity protection.","evidence":"Co-IP, live imaging, siRNA, fractionation, toxicity assays","pmids":["19841139"],"confidence":"High","gaps":["Direct vs indirect PIKfyve binding unresolved","Ubiquitin involvement not addressed here"]},{"year":2009,"claim":"Determinants of Cav1.2 surface expression in vasculature were unknown; α2δ-1 was shown to be essential for membrane trafficking and myogenic tone.","evidence":"Surface biotinylation, shRNA, patch clamp, pressurized myography","pmids":["19797702"],"confidence":"High","gaps":["Mechanism of α2δ-1-dependent trafficking not detailed","Vascular-bed specificity unclear"]},{"year":2009,"claim":"An N-terminal modulator of cardiac Cav1.2 was unknown; KChIP2 was shown to bind the N-terminus and modulate I_Ca,L, with compensatory CACNB2 upregulation upon loss.","evidence":"Co-IP, patch clamp, gene-chip/PCR in KChIP2 KO mice","pmids":["19713767"],"confidence":"Medium","gaps":["Single-lab interaction not reciprocally validated elsewhere in corpus","Direct vs compensatory effect on current entangled"]},{"year":2010,"claim":"Multiple trafficking and gating regulators were defined in cardiac and vascular myocytes: CaMKII/β2a gating-mode control, Rem GTPase gating arrest, Rab25 surface delivery, and ROS/NF-κB transcriptional control of channel abundance.","evidence":"Mutagenesis and single-channel/whole-cell electrophysiology in myocytes; immunoFRET; Ca2+/ROS imaging and reporter assays","pmids":["20194790","20616312","27076616","20616314"],"confidence":"High","gaps":["Integration of these regulators in vivo incomplete","ROS/NF-κB chain is indirect"]},{"year":2010,"claim":"Whether Cav1.2 Ca2+ load drives pathological remodeling was unproven; β2a-mediated influx was shown sufficient to induce hypertrophy via calcineurin/NFAT and CaMKII/HDAC.","evidence":"Transgenic and adenoviral β2a overexpression with pathway inhibition and NFAT/HDAC translocation assays","pmids":["21111744"],"confidence":"High","gaps":["Relative weighting of two pathways unresolved","Ca2+ pool source partially defined"]},{"year":2011,"claim":"How Cav1.2 reaches cardiac T-tubules and its relevance to heart failure was unknown; BIN1 was identified as the trafficking factor, reduced in failing hearts.","evidence":"Human myocyte imaging, T-tubule fractionation, patch clamp, mouse shRNA, zebrafish morpholino","pmids":["22138472"],"confidence":"High","gaps":["Direct BIN1–Cav1.2 binding interface not mapped","Causality in human failure correlative"]},{"year":2013,"claim":"Roles of Cav1.2 in development and non-excitable cells were unclear; influx-driven calcineurin signaling shapes jaw morphogenesis, and the Timothy syndrome G406R mutation acts dominantly via Fstl1/BMP signaling even without measurable currents.","evidence":"Mouse gain/loss-of-function, zebrafish, pharmacology; TS-Cav1.2 transgenic with Fstl1 analysis in hair follicle stem cells","pmids":["23549079","23752588"],"confidence":"Medium","gaps":["Mechanism of Ca2+-independent signaling in non-excitable cells incomplete","Single-lab for TS hair follicle phenotype"]},{"year":2013,"claim":"An immune role was undefined; Cav1.2 was shown to be selectively expressed in TH2 lymphocytes where PKC-dependent activation controls Ca2+ entry and cytokine output.","evidence":"Antisense knockdown, PKC modulation, Ca2+ imaging, cytokine assays in primary human T cells","pmids":["24365142"],"confidence":"Medium","gaps":["Voltage-gating in non-excitable T cells unresolved","Single-lab finding"]},{"year":2014,"claim":"How basal and β-adrenergic-stimulated cardiac current is set was unresolved; Ser1700 phosphorylation was shown essential for basal I_Ca,L and incremental β-adrenergic potentiation in vivo.","evidence":"S1700A knock-in mice, patch clamp, cardiac function and exercise testing","pmids":["25368181"],"confidence":"High","gaps":["Kinase(s) acting on Ser1700 in vivo not fully defined","Interplay with Ser1928 not addressed here"]},{"year":2015,"claim":"Store-operated coupling to Cav1.2 was unclear; Homer proteins were shown to bridge STIM1 to α1C, with Homer disruption enhancing Cav1.2 Ca2+ entry.","evidence":"Co-IP, Homer1 siRNA, dominant-negative peptide, Ca2+ imaging in HEK cells","pmids":["25712868"],"confidence":"Medium","gaps":["Native-tissue relevance untested","Direct binding interfaces not mapped"]},{"year":2015,"claim":"A developmental survival role in auditory circuits was unknown; embryonic Cav1.2 deletion reduced auditory nuclei volume and cell number and altered LSO firing.","evidence":"Conditional KO, brainstem electrophysiology, volumetric/cell-count and ABR analysis","pmids":["26242732"],"confidence":"Medium","gaps":["Molecular survival pathway not identified","Single-lab finding"]},{"year":2016,"claim":"The link between Cav1.2 and transcription/desensitization deepened: PKA-Ser1928 displaces β2AR to limit adrenergic responsiveness, NFAT5 and ROS-driven transcription control channel abundance, and behavioral/affective roles were dissected across brain regions and cell types.","evidence":"S1928A knock-in with Co-IP/electrophysiology; NFAT5 promoter binding and zebrafish rescue; region/temporally specific conditional KOs with behavior and plasticity assays","pmids":["27103070","27368804","28696432","27066530","28165117","27922594"],"confidence":"High","gaps":["Causal links between channel regulation and specific behaviors partially correlative","Developmental vs adult mechanisms not unified"]},{"year":2018,"claim":"Whether Cav1.2 signals to the nucleus independent of Ca2+ transport was unknown; depolarization was shown to drive Ras/ERK/CREB nuclear signaling via β2-subunit/H-Ras interaction, requiring pore Ca2+ occupancy but not flux.","evidence":"Channel mutants (Ca2+-impermeable, CaM-binding, W440A), recombinant H-Ras/β2 pulldowns, reporter assays in cell lines","pmids":["30150369","30176250"],"confidence":"High","gaps":["In vivo prevalence of flux-independent signaling unclear","Downstream gene targets incompletely cataloged"]},{"year":2019,"claim":"Auxiliary β subunits, transcriptional control by TDP-43, and ERα/Mdm2-mediated ubiquitination were shown to govern Cav1.2 regulation, expression, and degradation across heart, pancreatic β cells, and neurons.","evidence":"β-binding-deficient α1C transgenic and viral pharmacology; β-cell Tardbp KO with Cav1.2 rescue; ubiquitin mutants, Mdm2 overexpression, proteasome inhibition in vivo","pmids":["30422117","31355778","31012223"],"confidence":"High","gaps":["Degradation pathway is single-lab","Tissue-specific weighting of these mechanisms unresolved"]},{"year":2023,"claim":"How Cav1.2 integrates with Ca2+-release machinery in vascular microdomains was unclear; ANO1-Cav1.2-IP3R were shown to co-assemble to sustain serotonin-induced arterial contraction.","evidence":"Co-IP, superresolution microscopy, smooth-muscle ANO1 ablation, pharmacology, GCaMP imaging","pmids":["37702787"],"confidence":"Medium","gaps":["Stoichiometry of tripartite complex unknown","Direct vs proximity-based interactions undistinguished"]},{"year":2024,"claim":"The microcircuit role of Cav1.2 in primate cognition was undefined; in dPFC spines it was localized near ER and coupled to SK3, producing an inverted-U dependence of firing on L-type channel activity for working memory.","evidence":"EM/light microscopy, pharmacology during unit recording in behaving macaques, transcriptomics","pmids":["38776078"],"confidence":"Medium","gaps":["Causal genetic manipulation in primates lacking","Link to human disease alleles indirect"]},{"year":null,"claim":"How the many context-specific Cav1.2 regulatory modules (kinase phosphosites, auxiliary subunits, trafficking/degradation routes, and flux-independent signaling) are coordinated within a single native complex and how disease alleles perturb that integration remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No integrated structural model of the native macromolecular complex","Mechanism unifying excitable and non-excitable signaling roles unknown","Causal mapping from channel regulation to specific human phenotypes incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[8,29,5,10]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,21,4]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[8,13,28,37]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[4,21]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[7,27]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,17,21]},{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[29,11,22]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[4,32,38]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[11,21,19]}],"complexes":["Cav1.2 L-type calcium channel (α1C/β2/α2δ)","β2AR-Cav1.2 signaling complex","ANO1-Cav1.2-IP3R microdomain complex"],"partners":["ADRB2","CALM1","CABP1","CACNB2","CACNA2D1","BIN1","HRAS","STIM1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q13936","full_name":"Voltage-dependent L-type calcium channel subunit alpha-1C","aliases":["Calcium channel, L type, alpha-1 polypeptide, isoform 1, cardiac muscle","Voltage-gated calcium channel subunit alpha Cav1.2"],"length_aa":2221,"mass_kda":249.0,"function":"Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents (PubMed:12181424, PubMed:15454078, PubMed:15863612, PubMed:16299511, PubMed:17224476, PubMed:20953164, PubMed:23677916, PubMed:24728418, PubMed:26253506, PubMed:27218670, PubMed:29078335, PubMed:29742403, PubMed:30023270, PubMed:30172029, PubMed:34163037, PubMed:8099908). Mediates influx of calcium ions into the cytoplasm, and thereby triggers calcium release from the sarcoplasm (By similarity). Plays an important role in excitation-contraction coupling in the heart. Required for normal heart development and normal regulation of heart rhythm (PubMed:15454078, PubMed:15863612, PubMed:17224476, PubMed:24728418, PubMed:26253506). Required for normal contraction of smooth muscle cells in blood vessels and in the intestine. Essential for normal blood pressure regulation via its role in the contraction of arterial smooth muscle cells (PubMed:28119464). Long-lasting (L-type) calcium channels belong to the 'high-voltage activated' (HVA) group (Probable) Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents (Microbial infection) Acts as a receptor for Influenzavirus (PubMed:29779930). May play a critical role in allowing virus entry when sialylated and expressed on lung tissues (PubMed:29779930)","subcellular_location":"Cell membrane; Cell membrane, sarcolemma; Perikaryon; Postsynaptic density membrane; Cell projection, dendrite; Cell membrane, sarcolemma, T-tubule","url":"https://www.uniprot.org/uniprotkb/Q13936/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CACNA1C","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CACNA1C","total_profiled":1310},"omim":[{"mim_id":"621557","title":"CALCIUM HOMEOSTASIS MODULATOR 5; CALHM5","url":"https://www.omim.org/entry/621557"},{"mim_id":"621356","title":"SH3 AND CYSTEINE-RICH DOMAINS 2; STAC2","url":"https://www.omim.org/entry/621356"},{"mim_id":"620966","title":"TLC DOMAIN-CONTAINING PROTEIN 1; TLCD1","url":"https://www.omim.org/entry/620966"},{"mim_id":"620029","title":"NEURODEVELOPMENTAL DISORDER WITH HYPOTONIA, LANGUAGE DELAY, AND SKELETAL DEFECTS WITH OR WITHOUT SEIZURES; NEDHLSS","url":"https://www.omim.org/entry/620029"},{"mim_id":"619863","title":"JUNCTOPHILIN 4; JPH4","url":"https://www.omim.org/entry/619863"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Approved"},{"location":"Primary cilium","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"intestine","ntpm":25.0}],"url":"https://www.proteinatlas.org/search/CACNA1C"},"hgnc":{"alias_symbol":["Cav1.2","CACH2","CACN2","TS","LQT8"],"prev_symbol":["CCHL1A1","CACNL1A1","CACNA1C-IT2"]},"alphafold":{"accession":"Q13936","domains":[{"cath_id":"1.20.120.350","chopping":"103-218_234-251","consensus_level":"high","plddt":79.664,"start":103,"end":251},{"cath_id":"1.10.287.70","chopping":"659-779","consensus_level":"medium","plddt":82.0517,"start":659,"end":779},{"cath_id":"1.20.120.350","chopping":"889-946_955-1032","consensus_level":"high","plddt":68.7287,"start":889,"end":1032},{"cath_id":"1.10.287.70","chopping":"1042-1076_1115-1189","consensus_level":"medium","plddt":83.7251,"start":1042,"end":1189},{"cath_id":"-","chopping":"1084-1110","consensus_level":"medium","plddt":82.6907,"start":1084,"end":1110},{"cath_id":"1.20.120.350","chopping":"1228-1339_1369-1391","consensus_level":"high","plddt":82.5289,"start":1228,"end":1391},{"cath_id":"1.10.238.10","chopping":"1534-1682_2115-2123","consensus_level":"medium","plddt":73.9699,"start":1534,"end":2123}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13936","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q13936-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q13936-F1-predicted_aligned_error_v6.png","plddt_mean":61.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CACNA1C","jax_strain_url":"https://www.jax.org/strain/search?query=CACNA1C"},"sequence":{"accession":"Q13936","fasta_url":"https://rest.uniprot.org/uniprotkb/Q13936.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q13936/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13936"}},"corpus_meta":[{"pmid":"11441182","id":"PMC_11441182","title":"A 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Cell physiology","url":"https://pubmed.ncbi.nlm.nih.gov/27076616","citation_count":15,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":54195,"output_tokens":10195,"usd":0.157755,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":20890,"output_tokens":7434,"usd":0.14515,"stage2_stop_reason":"end_turn"},"total_usd":0.302905,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"The β2 adrenergic receptor forms a direct macromolecular signaling complex with Cav1.2, also containing a G protein, adenylyl cyclase, PKA, and PP2A, enabling highly localized and specific signal transduction from receptor to channel in hippocampal neurons.\",\n      \"method\": \"Co-immunoprecipitation, electrophysiology in hippocampal neurons\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP identifying multiple complex components plus functional electrophysiological validation in native neurons; widely replicated across subsequent studies\",\n      \"pmids\": [\"11441182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PKC isoforms form a macromolecular complex with the α1c subunit of Cav1.2 via direct interaction with the C-terminus, and phosphorylate Ser1928 both in vitro and in vivo, the same residue phosphorylated by PKA, indicating convergence of PKA and PKC signaling on Cav1.2 at Ser1928.\",\n      \"method\": \"In vitro kinase assay, Co-immunoprecipitation, site-directed mutagenesis, metabolic labeling in intact cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro phosphorylation assay with identified site, in vivo confirmation, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"15509562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Apocalmodulin (apoCaM) binds with higher affinity to the C-IQ region of Cav1.2 than to the IQ peptide alone; Ca2+-CaM binds all three C-terminal regions (A, C, IQ); binding to IQ and C peptides increases Ca2+ affinity of the C-lobe of CaM; apoCaM binding to the IQ motif is necessary for rapid Ca2+ binding to the C-lobe and subsequent Ca2+-dependent inactivation. Double mutation of IQ motif residues reduces apoCaM interaction.\",\n      \"method\": \"Fluorescence binding assays, peptide competition assays, site-directed mutagenesis of IQ motif in channel\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutagenesis, multiple peptide/binding assays in single study\",\n      \"pmids\": [\"12944271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CaBP1 (Ca2+-binding protein-1) directly interacts with the α1 subunit of Cav1.2 at IQ domain and other CaM-binding sites; IQ binding is Ca2+-dependent and competitive with CaM. CaBP1 co-purifies with Cav1.2 in postsynaptic density fractions from rat brain and colocalizes in neuronal dendrites. CaBP1 prevents Ca2+-dependent inactivation and causes Ca2+-dependent facilitation of Cav1.2 currents, contrasting with CaM's promotion of inactivation.\",\n      \"method\": \"Co-immunoprecipitation, postsynaptic density fractionation, double-label immunofluorescence, whole-cell electrophysiology in transfected cells\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP in native tissue plus functional electrophysiology with orthogonal localization data\",\n      \"pmids\": [\"15140941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Conditional knockout of Cav1.2 (CACNA1C) in hippocampus and neocortex selectively abolishes protein synthesis-dependent, NMDAR-independent late-phase LTP (L-LTP) at Schaffer collateral/CA1 synapses, impairs hippocampus-dependent spatial memory, and decreases MAPK pathway activation and CRE-dependent transcription in CA1 pyramidal neurons.\",\n      \"method\": \"Conditional knockout mouse (Cav1.2 HCKO), electrophysiology (LTP recording), spatial memory behavioral assays, biochemical signaling assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean conditional KO with multiple orthogonal readouts (LTP, behavior, biochemistry) in single study\",\n      \"pmids\": [\"16251435\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Protein kinase G (PKGIα) phosphorylates specific residues within both the α1c and β2a subunits of Cav1.2 in vitro and in intact HEK cells and cardiac myocytes; PKG-mediated inhibition of Cav1.2 whole-cell current is significantly reduced by alanine substitution of Ser496 on the β2a subunit.\",\n      \"method\": \"In vitro kinase assay, phospho-epitope-specific antibodies, whole-cell patch clamp, site-directed mutagenesis\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro assay plus mutagenesis plus electrophysiology in multiple cell types in single rigorous study\",\n      \"pmids\": [\"17626895\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Fox family splicing regulators (Fox1 and Fox2) directly control alternative splicing of CaV1.2 exons 9* and 33 during cortical development: Fox proteins repress exon 9* inclusion and enhance exon 33 inclusion via binding elements in adjacent introns, generating splice variants with distinct electrophysiological properties.\",\n      \"method\": \"siRNA knockdown, overexpression of Fox1/Fox2, minigene reporter assays, RT-PCR of endogenous CaV1.2 mRNA in cortical neurons\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (KD, OE, minigene reporters, mutagenesis of binding elements) establishing direct regulatory mechanism\",\n      \"pmids\": [\"19564422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NMDA receptor activation causes internalization and lysosomal degradation of CaV1.2 channels through binding to PIKfyve (phosphatidylinositol 3-phosphate 5-kinase), which generates PtdIns(3,5)P2 and promotes CaV1.2 targeting to lysosomes; PIKfyve knockdown prevents CaV1.2 degradation and increases neuronal susceptibility to excitotoxicity.\",\n      \"method\": \"Immunoprecipitation, live imaging, siRNA knockdown, biochemical fractionation, toxicity assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying binding partner, KD with defined functional phenotype (excitotoxicity), multiple orthogonal readouts\",\n      \"pmids\": [\"19841139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"α2δ-1 is the sole α2δ isoform in cerebral artery myocytes, is essential for plasma membrane expression of Cav1.2 α1 subunits, and directly regulates CaV1.2 current; α2δ-1 knockdown reduces surface Cav1.2, decreases intracellular Ca2+ concentration, and inhibits pressure-induced vasoconstriction (myogenic tone).\",\n      \"method\": \"Surface biotinylation, shRNA knockdown, patch-clamp electrophysiology, pressurized vessel myography, confocal microscopy\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (biotinylation, shRNA, electrophysiology, myography) with clear functional consequence\",\n      \"pmids\": [\"19797702\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CaMKII binding to β2a subunit residue Leu493 and phosphorylation of Thr498 are required for CaV1.2 to enter a high-activity gating mode (mode 2); expression of T498A or L493A β2a mutants reduces Ca2+ entry through Cav1.2, inhibits early afterdepolarizations (EADs), and improves cardiomyocyte survival in CaMKII-overloaded conditions.\",\n      \"method\": \"Site-directed mutagenesis, patch-clamp electrophysiology (single-channel and whole-cell), adenoviral overexpression in adult rabbit ventricular myocytes, cell survival assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis of specific residues with in vitro electrophysiology confirming gating mode, functional cardiac phenotype readout\",\n      \"pmids\": [\"20194790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Rem GTPase inhibits Cav1.2 in heart primarily by arresting surface channels in a low open-probability gating mode (not by reducing channel trafficking); this inhibition requires GTP-binding but not membrane targeting, and Rem-inhibited channels cannot be rescued by PKA-dependent phosphorylation but can be rescued by Bay K 8644.\",\n      \"method\": \"Patch-clamp electrophysiology (whole-cell and gating charge measurements), overexpression in adult guinea pig cardiomyocytes, dominant-negative and chimeric Rem mutants\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — gating charge measurements plus mutagenesis plus pharmacological rescue in native cardiomyocytes, rigorous mechanistic dissection\",\n      \"pmids\": [\"20616312\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Increasing L-type Ca2+ influx through Cav1.2 (via β2a subunit overexpression) is sufficient to induce pathological cardiomyocyte hypertrophy through calcineurin/NFAT and CaMKII/HDAC signaling pathways; both cytosolic and SR/ER-nuclear envelope Ca2+ pools are involved.\",\n      \"method\": \"Transgenic mouse models with β2a overexpression, adenoviral overexpression in cultured cardiomyocytes, L-type channel blockade, calcineurin/CaMKII inhibition, NFAT/HDAC translocation assays\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic and pharmacological approaches with defined pathway placement (calcineurin/NFAT, CaMKII/HDAC) in vivo and in vitro\",\n      \"pmids\": [\"21111744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"IP3R-mediated SR Ca2+ release elevates mitochondrial [Ca2+], induces mitochondrial ROS generation, which activates NF-κB to stimulate CaV1.2 channel transcription in arterial myocytes, thereby modulating vasoconstriction.\",\n      \"method\": \"Mitochondrial Ca2+ imaging, ROS measurements, NF-κB reporter assays, siRNA knockdown, qRT-PCR, patch-clamp, pressurized myography\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal assays in single lab establishing transcriptional control pathway, but complex indirect chain\",\n      \"pmids\": [\"20616314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"BIN1 (bridging integrator 1) traffics Cav1.2 to cardiac T-tubules; BIN1 is significantly reduced in failing human cardiomyocytes, and this reduction impairs Cav1.2 trafficking to T-tubules, reduces surface Ca2+ current, and impairs calcium transients and contractility.\",\n      \"method\": \"Confocal imaging of human failing/non-failing myocytes, T-tubule biochemical fractionation, patch clamp, shRNA knockdown in mouse cardiomyocytes, zebrafish morpholino knockdown\",\n      \"journal\": \"Heart rhythm\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human tissue plus mouse KD plus zebrafish model, multiple orthogonal methods establishing trafficking mechanism with functional consequence\",\n      \"pmids\": [\"22138472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Ca2+ influx through CaV1.2 regulates jaw/mandible development by controlling cellular hypertrophy and hyperplasia via the calcineurin signaling pathway in jaw primordium cells; CaV1.2 is expressed in first and second pharyngeal arch cells.\",\n      \"method\": \"Gain-of-function and loss-of-function mouse models, zebrafish knockdown/rescue, pharmacological blockade, calcineurin pathway assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple species, genetic and pharmacological approaches, pathway identified (calcineurin), replication across model systems\",\n      \"pmids\": [\"23549079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Timothy syndrome (TS) gain-of-function mutation G406R in Cav1.2 acts in a dominant-negative manner in hair follicle stem cells to delay anagen; Cav1.2 regulates production of the BMP inhibitor follistatin-like1 (Fstl1) from the bulge to derepress stem cell quiescence. This occurs in the absence of detectable voltage-dependent Ca2+ currents in these non-excitable cells.\",\n      \"method\": \"Transgenic mouse expressing TS-Cav1.2, L-type channel blocker treatment, Fstl1 expression analysis, hair follicle stem cell assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacological approaches in vivo with downstream target (Fstl1) identified, single lab\",\n      \"pmids\": [\"23752588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Phosphorylation of Ser1700 on Cav1.2 is essential for maintaining basal L-type Ca2+ current in cardiomyocytes and for the incremental increase by β-adrenergic receptor stimulation (isoproterenol); Ser1700Ala knock-in mice develop cardiac hypertrophy and have reduced stress-induced exercise tolerance.\",\n      \"method\": \"Knock-in mouse model (S1700A), patch-clamp electrophysiology in neonatal and adult cardiomyocytes, in vivo cardiac function assays, exercise testing\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vivo knock-in mutagenesis with electrophysiology and physiological phenotyping, rigorous mechanistic study\",\n      \"pmids\": [\"25368181\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Phosphorylation of Cav1.2 Ser1928 by PKA, within the β2AR binding site (residues 1923-1942), displaces the β2AR from Cav1.2 upon β-adrenergic stimulation, rendering Cav1.2 refractory to further β-adrenergic stimulation for several minutes; this effect is lost in S1928A knock-in mice. Long-term potentiation induced by prolonged theta tetanus requires Cav1.2 and its regulation by channel-associated β2AR.\",\n      \"method\": \"S1928A knock-in mice, Co-immunoprecipitation, electrophysiology (patch clamp and LTP recording), β-adrenergic stimulation assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vivo knock-in plus Co-IP plus electrophysiology establishing a specific desensitization mechanism with multiple orthogonal validations\",\n      \"pmids\": [\"27103070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Deletion of cacna1c in the adult mouse prefrontal cortex produces antidepressant-like effects and reduces REDD1 protein levels; REDD1 overexpression in the PFC of cacna1c heterozygous mice reverses the antidepressant-like phenotype and is associated with lower phospho-Akt (S473) and higher nuclear FoxO3a levels.\",\n      \"method\": \"Viral vector-mediated conditional knockout, behavioral assays (SPT, FST, TST), molecular signaling assays (REDD1, Akt, FoxO3a)\",\n      \"journal\": \"Neuropsychopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — viral KO with rescue experiment identifying REDD1-FoxO3a pathway, multiple behavioral readouts, single lab\",\n      \"pmids\": [\"27922594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NFAT5 binds to a consensus sequence (TGGAAGCGTTC) in the promoter of Cacna1c and activates its transcription; siRNA-mediated NFAT5 knockdown suppresses Cacna1c expression and decreases L-type Ca2+ current in mouse neonatal cardiomyocytes; morpholino knockdown of nfat5 in zebrafish prevents cacna1c expression and results in non-contractile ventricle, rescued by overexpression of either cacna1c or nfat5.\",\n      \"method\": \"Promoter analysis, ChIP/binding assay, siRNA knockdown, patch clamp, zebrafish morpholino knockdown with rescue\",\n      \"journal\": \"Journal of molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct promoter binding identified, cross-species validation with rescue experiment, multiple orthogonal methods\",\n      \"pmids\": [\"27368804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Increased Ca2+ influx through CaV1.2 in osteoblasts activates osteogenic transcriptional programs, promotes mineralization, and inhibits osteoclast activity through increased osteoprotegerin secretion; CaV1.2 is expressed in proliferating chondrocytes and osteoblasts in developing bone.\",\n      \"method\": \"Transgenic gain-of-function CaV1.2 mutant mice (Prx1-, Col2a1-, Col1a1-Cre), BMSC primary cultures, osteoprotegerin assays, ovariectomy bone-loss model\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo transgenic plus primary cell culture with downstream pathway (osteoprotegerin), single lab\",\n      \"pmids\": [\"29202453\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Membrane depolarization triggers nuclear signaling (c-Fos and MeCP2 activation via Ras/ERK/CREB pathway) through Cav1.2 in a Ca2+-influx-independent manner; this requires the intracellular β2 subunit's interaction with H-Ras and is dependent on Ca2+ occupancy of the open channel pore but not Ca2+ transport. Loss of α1-β2 interaction (W440A mutation) or absence of β2 abolishes nuclear signaling.\",\n      \"method\": \"Mutagenesis (Ca2+-impermeable channel α1L745P, CaM-binding disrupting α1I1624A, α1W440A), pulldown assays with recombinant H-Ras and β2, transfection in HEK293 and SH-SY5Y cells, reporter assays for c-Fos/MeCP2\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple channel mutants plus in vitro binding reconstitution establishing Ca2+-independent nuclear signaling mechanism\",\n      \"pmids\": [\"30150369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CaV1.2 β subunits are dispensable for channel trafficking to the sarcolemma in adult cardiomyocytes but are required for β-adrenergic regulation of Cav1.2 and positive inotropy; transgenic α1C lacking the β-subunit binding site traffics normally but cannot be stimulated by isoproterenol.\",\n      \"method\": \"Transgenic mouse expressing β-binding-deficient α1C, patch clamp, contractility assays in isolated cardiomyocytes and intact heart, viral β-subunit-sequestering peptide\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vivo transgenic plus viral pharmacology in adult cardiomyocytes, clear separation of trafficking from adrenergic regulation\",\n      \"pmids\": [\"30422117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TDP-43 regulates CaV1.2 expression in pancreatic β cells; TDP-43 loss (nuclear depletion) downregulates CaV1.2 and inhibits exocytosis, reducing early-phase insulin secretion; overexpression of CaV1.2 restores early-phase insulin secretion in Tardbp-knockdown MIN6 cells.\",\n      \"method\": \"β cell-specific Tardbp knockout mice, MIN6 cell siRNA knockdown, CaV1.2 overexpression rescue, insulin secretion assays, exocytosis measurements\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO plus rescue with CaV1.2 overexpression in both cell line and in vivo model, clear functional phenotype\",\n      \"pmids\": [\"31355778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Estrogen receptor α (ERα) promotes Cav1.2 ubiquitination and proteasomal degradation in neurons via K29-linked ubiquitin chains and the E3 ligase Mdm2, utilizing the PEST sequence in Cav1.2; ERα agonist administration reduces cerebral Cav1.2 protein and increases Cav1.2 ubiquitination in OVX APP/PS1 mice.\",\n      \"method\": \"Ubiquitin mutant (K29R), TRABID overexpression, Mdm2 overexpression, MG132 proteasome inhibitor, in vivo ERα agonist (PPT) treatment, immunofluorescence colocalization in vivo\",\n      \"journal\": \"Aging cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple mechanistic tools (UB mutants, E3 ligase OE, proteasome inhibitor) in single lab identifying degradation pathway\",\n      \"pmids\": [\"31012223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Ketamine directly inhibits Cav1.2 calcium channels and blocks Cav1.2-mediated induction of immediate early genes and transcription factors in smooth muscle; Cav1.2-specific inactivation in smooth muscle mimics the ketamine cystitis phenotype, and Cav1.2 agonist Bay K 8644 reverses ketamine-induced smooth muscle dysfunction.\",\n      \"method\": \"Patch-clamp electrophysiology, smooth muscle-specific Cav1.2 conditional knockout, pharmacological rescue with Bay K 8644, gene expression assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct electrophysiological demonstration of channel block plus genetic KO phenocopy plus pharmacological rescue in single rigorous study\",\n      \"pmids\": [\"32859919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Homer proteins mediate the physical interaction between STIM1 and the Cav1.2 α1 subunit; store depletion (thapsigargin) induces co-immunoprecipitation of Homer1 with STIM1 and Cav1.2 α1; disruption of Homer function (PPKKFR peptide or siRNA Homer1) reduces STIM1-Cav1.2 association and enhances nifedipine-sensitive Ca2+ entry through Cav1.2.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown of Homer1, dominant-negative PPKKFR peptide, Ca2+ imaging in HEK-293 cells expressing Cav1.2 subunits\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying complex plus two orthogonal disruption approaches (peptide and siRNA), single lab\",\n      \"pmids\": [\"25712868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Rab25 GTPase co-localizes with Cav1.2 in cerebral artery myocytes and is required for surface expression of Cav1.2 channels; Rab25 knockdown reduces both surface and intracellular Cav1.2 abundance through lysosomal and proteasomal degradation, decreases whole-cell CaV1.2 current, and inhibits pressure-induced vasoconstriction.\",\n      \"method\": \"immunoFRET microscopy, surface biotinylation, siRNA knockdown, patch-clamp electrophysiology, pressurized myography\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRET-based spatial proximity plus siRNA with functional readout, single lab\",\n      \"pmids\": [\"27076616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"α5β1-integrin engagement by fibronectin acutely enhances Cav1.2 current and forms a macromolecular complex with Cav1.2; co-association requires cell adhesion to fibronectin and Cav1.2 C-terminal residues Ser1901, Tyr2122, and two proline-rich domains; phosphorylation at Y2122 and/or S1901 and c-Src binding to PRDs mediate current potentiation.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis of Cav1.2, patch-clamp electrophysiology, confocal immunofluorescence\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus mutagenesis plus electrophysiology, single lab\",\n      \"pmids\": [\"21178109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Smooth muscle-specific knockout of Cav1.2 (SMACKO) abolishes L-type calcium current, protein, and spontaneous contractile activity in the bladder; K+- and carbachol-induced contractions are reduced ~10-fold; Rho-kinase and Ca2+-release pathways cannot compensate for the absence of Cav1.2. CCh-induced contraction requires extracellular Ca2+ but not PLC or intracellular Ca2+ stores.\",\n      \"method\": \"Smooth muscle-specific conditional knockout mouse, electrophysiology, contractility assays, pharmacological dissection\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic KO with multiple pharmacological controls defining Cav1.2 as essential for bladder smooth muscle contraction\",\n      \"pmids\": [\"15132976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"KChIP2 directly interacts with the amino-terminus of CaV1.2 (confirmed by co-immunoprecipitation) and functionally modulates the cardiac L-type Ca2+ current; KChIP2 knockout mice show decreased ICa,L and compensatory transcriptional upregulation of the calcium channel β2 subunit (CACNB2).\",\n      \"method\": \"Co-immunoprecipitation, patch-clamp electrophysiology, gene-chip and real-time PCR in KChIP2(-/-) mice\",\n      \"journal\": \"Channels (Austin, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP confirming interaction plus KO electrophysiology, single lab\",\n      \"pmids\": [\"19713767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PKC-dependent activation of Cav1.2 channels selectively controls human TH2 lymphocyte Ca2+ entry and cytokine responses; Cav1.2 is selectively expressed and maintained in TH2 but not TH1 or TH9 cells; both nicardipine and Cav1.2-specific antisense oligonucleotides decrease Ca2+ and cytokine responses in TH2 cells.\",\n      \"method\": \"Flow cytometry, antisense oligonucleotide knockdown, PKC inhibition/activation, Ca2+ imaging, cytokine assays in primary human T cells\",\n      \"journal\": \"The Journal of allergy and clinical immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with antisense plus pharmacological approach in primary human cells, single lab\",\n      \"pmids\": [\"24365142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Forebrain-specific conditional knockout of cacna1c in adult mice improved cognitive flexibility and strengthened synaptic plasticity, while embryonic deletion caused cognitive decline, impaired synaptic plasticity, reduced sociability, hyperactivity, and increased anxiety-like behavior, demonstrating a differential developmental vs adult role for Cav1.2.\",\n      \"method\": \"Conditional knockout (embryonic vs. adult timing using inducible Cre), synaptic plasticity recordings, behavioral phenotyping, chronic stress exposure\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — temporally controlled genetic approach dissecting developmental from adult function using multiple behavioral and electrophysiological readouts\",\n      \"pmids\": [\"28696432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Cacna1c deletion specifically in nucleus accumbens neurons increases susceptibility to social defeat stress; reduced Cacna1c expression in nucleus accumbens is causally associated with maladaptive outcomes after chronic social defeat.\",\n      \"method\": \"Viral Cre-mediated conditional knockout in nucleus accumbens of floxed Cacna1c mice, social interaction and female urine preference assays\",\n      \"journal\": \"The international journal of neuropsychopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — region-specific viral KO with behavioral phenotyping, single lab\",\n      \"pmids\": [\"28165117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Cacna1c forebrain knockout mice exhibit enhanced death of young hippocampal neurons (without change in NPC proliferation) and deficits in brain BDNF levels; adult hippocampal Cre-mediated knockdown of Cav1.2 recapitulates the survival deficit.\",\n      \"method\": \"Forebrain-specific conditional knockout, BrdU/Ki67 labeling, TUNEL/survival assays, BDNF measurement, viral Cre knockdown in adults\",\n      \"journal\": \"eNeuro\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO plus viral adult KD with defined cellular phenotype (neuronal survival), single lab\",\n      \"pmids\": [\"27066530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cacna1c knockout specifically in serotonin (5-HT) neurons disrupts active-coping behavior in the forced swim test; this is rescued by blocking 5-HT1A receptors; Cacna1c knockout mice show enhanced Fos expression in caudal DR 5-HT neurons and enhanced response to a 5-HT1A antagonist in rostral DR neurons, indicating disrupted 5-HT neuron activation and 5-HT1A feedback inhibition.\",\n      \"method\": \"5-HT neuron-specific conditional Cacna1c knockout (temporally controlled), forced swim test, c-Fos immunohistochemistry, pharmacological rescue with WAY-100635\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific KO with pharmacological rescue and neural activity markers, single lab\",\n      \"pmids\": [\"30176250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Loss of Cav1.2 in the auditory brainstem (targeted embryonic deletion) causes significant decreases in auditory nuclei volume and cell number; action potentials of lateral superior olive neurons are narrower than controls; the medial nucleus of the trapezoid body undergoes rapid cell loss between P0 and P4.\",\n      \"method\": \"Conditional knockout mouse, electrophysiology of auditory brainstem neurons, volumetric and cell-count analysis, auditory brainstem response recordings\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic KO with multiple structural and electrophysiological readouts, single lab\",\n      \"pmids\": [\"26242732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ANO1, CaV1.2, and IP3R co-assemble in a microdomain at or near the plasma membrane of pulmonary arterial smooth muscle cells (confirmed by co-immunoprecipitation and superresolution nanomicroscopy); this tripartite complex integrates stochastic Ca2+ release events and Ca2+ waves to sustain serotonin-induced arterial contraction.\",\n      \"method\": \"Co-immunoprecipitation, confocal and superresolution microscopy, smooth muscle-specific ANO1 ablation, pharmacological blockade of CaV1.2 and IP3R, Ca2+ imaging with GCaMP\",\n      \"journal\": \"The Journal of general physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying ternary complex plus orthogonal microscopy and genetic/pharmacological disruption in single study\",\n      \"pmids\": [\"37702787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In layer III pyramidal cells of dorsolateral prefrontal cortex, Cav1.2 (CACNA1C) is concentrated in dendritic spines near calcium-storing smooth ER, co-expressed with GRIN2B and KCNN3 (SK3); L-type calcium channel activation drives SK3-mediated inhibition of firing; both blockade and excessive activation of L-type channels reduce neuronal firing needed for working memory.\",\n      \"method\": \"Electron and light microscopy of macaque dPFC, pharmacological blockade and activation of L-type channels during unit recording, working memory behavioral tasks, transcriptomic profiling of human and macaque pyramidal cells\",\n      \"journal\": \"JAMA psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by EM plus electrophysiology during behavior in primates, multiple orthogonal approaches in single study\",\n      \"pmids\": [\"38776078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"The human CACNA1C gene (encoding the α1 subunit of the cardiac dihydropyridine-sensitive Ca2+ channel, CCHL1A1) was mapped to chromosome 12p12-pter by PCR analysis of somatic cell hybrids.\",\n      \"method\": \"PCR of human-rodent somatic cell hybrids with human-specific oligonucleotides\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genomic localization by somatic cell hybrid mapping, foundational chromosomal assignment\",\n      \"pmids\": [\"1653763\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CACNA1C encodes the pore-forming α1C subunit of the Cav1.2 L-type voltage-gated calcium channel, which functions as a hub for macromolecular signaling complexes (including β2AR, PKA, PKC, PKG, CaMKII, CaM/CaBP1, and scaffolding proteins such as AKAPs and BIN1) that tightly regulate channel gating, trafficking, and downstream signaling; key phosphorylation sites (Ser1700 and Ser1928) control basal activity and β-adrenergic regulation, while alternative splicing by Fox proteins tunes electrophysiological properties during development, and the channel drives Ca2+-dependent transcription (via calcineurin/NFAT, CaMKII/HDAC, and Ras/ERK/CREB pathways), neuronal survival, synaptic plasticity, excitation-contraction coupling in cardiac and smooth muscle, and diverse developmental processes including jaw morphogenesis and hippocampal neurogenesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CACNA1C encodes the pore-forming \\u03b11C subunit of the Cav1.2 L-type voltage-gated calcium channel, which serves as a Ca2+-entry hub and signaling scaffold that couples membrane depolarization to excitation-contraction coupling, neuronal plasticity, and Ca2+-dependent transcription [#0, #4, #29]. Cav1.2 nucleates a macromolecular signaling complex in which a \\u03b22-adrenergic receptor, G protein, adenylyl cyclase, PKA and PP2A are physically tethered for local, specific regulation [#0]; channel gating is tuned by convergent phosphorylation, with PKA and PKC both targeting Ser1928 on the \\u03b11C C-terminus [#1], PKG phosphorylating \\u03b11C and the \\u03b22a subunit to inhibit current [#5], and CaMKII binding the \\u03b22a subunit to drive a high-activity gating mode [#9]. Two phosphosites partition basal from stimulated activity: Ser1700 maintains basal L-type current and supports \\u03b2-adrenergic potentiation [#16], while PKA phosphorylation of Ser1928 displaces the associated \\u03b22AR to render the channel refractory to further adrenergic stimulation [#17], a regulation that itself requires the auxiliary \\u03b2 subunit binding site [#22]. Ca2+/calmodulin and the related CaBP1 compete at the C-terminal IQ region to set Ca2+-dependent inactivation versus facilitation [#2, #3]. Channel abundance and surface delivery are controlled by auxiliary and trafficking proteins including \\u03b12\\u03b4-1, BIN1, Rab25, the PIKfyve/lysosomal and ER\\u03b1/Mdm2 ubiquitin\\u2013proteasome degradation routes, and by alternative splicing through Fox proteins and transcriptional inputs from NFAT5 and TDP-43 [#6, #7, #8, #13, #19, #23, #24, #27]. Downstream, Cav1.2 Ca2+ influx \\u2014 and in some contexts a Ca2+-flux-independent, \\u03b22-subunit/H-Ras-dependent route [#21] \\u2014 drives calcineurin/NFAT, CaMKII/HDAC, and Ras/ERK/CREB transcriptional programs governing cardiac hypertrophy, jaw and bone morphogenesis, smooth muscle contraction, hippocampal late-LTP and memory, and neuronal survival [#4, #11, #14, #20, #29, #34]. A gain-of-function G406R mutation underlies Timothy syndrome, acting dominantly even in non-excitable cells [#15].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Establishing the chromosomal locus of the cardiac dihydropyridine-sensitive Ca2+ channel \\u03b11 subunit gave the molecular anchor for all subsequent CACNA1C genetics.\",\n      \"evidence\": \"PCR mapping of human-rodent somatic cell hybrids\",\n      \"pmids\": [\"1653763\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional or expression data\", \"Channel biology not yet addressed\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"It was unknown how \\u03b2-adrenergic signals reach Cav1.2 with such speed and specificity; identifying a receptor-channel macromolecular complex showed signaling is hardwired by physical proximity.\",\n      \"evidence\": \"Reciprocal Co-IP and electrophysiology in hippocampal neurons identifying \\u03b22AR, G protein, adenylyl cyclase, PKA, PP2A on Cav1.2\",\n      \"pmids\": [\"11441182\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structural arrangement unresolved\", \"Phosphosite specificity not defined here\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"How Cav1.2 senses its own Ca2+ flux was unclear; mapping apoCaM/Ca2+-CaM binding to the C-terminal IQ/A/C regions defined the molecular basis of Ca2+-dependent inactivation.\",\n      \"evidence\": \"Fluorescence and peptide competition binding assays with IQ-motif mutagenesis\",\n      \"pmids\": [\"12944271\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vitro peptide system, not full channel context\", \"Functional CDI tested indirectly\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Convergence of kinase inputs was unknown; demonstrating PKC binds the C-terminus and phosphorylates Ser1928 \\u2014 the same PKA site \\u2014 revealed an integration node for distinct signaling pathways.\",\n      \"evidence\": \"In vitro kinase assay, Co-IP, site-directed mutagenesis, metabolic labeling in cells\",\n      \"pmids\": [\"15509562\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological consequence of Ser1928 phosphorylation not yet defined\", \"PKC isoform specificity partial\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Whether a CaM relative could reverse channel feedback was untested; CaBP1 was shown to compete with CaM at the IQ motif and convert inactivation to facilitation, diversifying Ca2+ feedback.\",\n      \"evidence\": \"Co-IP, PSD fractionation, immunofluorescence, whole-cell electrophysiology\",\n      \"pmids\": [\"15140941\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-type-specific roles unclear\", \"Structural basis of competition not resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"The requirement of Cav1.2 for smooth muscle contraction was inferred but not genetically proven; smooth-muscle KO established it as essential and non-redundant for bladder contractility.\",\n      \"evidence\": \"Smooth muscle-specific conditional KO with electrophysiology and contractility/pharmacology\",\n      \"pmids\": [\"15132976\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Compensatory pathways excluded only for bladder\", \"Molecular coupling to contractile machinery not addressed\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"The role of Cav1.2 in long-term plasticity was unknown; conditional KO showed it is selectively required for protein-synthesis-dependent late-LTP, spatial memory, and CREB-dependent transcription.\",\n      \"evidence\": \"Hippocampus/cortex conditional KO with LTP, behavior, and biochemical signaling assays\",\n      \"pmids\": [\"16251435\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking channel to MAPK/CRE not fully mapped\", \"Ca2+-flux vs scaffold contribution undistinguished\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"How cGMP signaling restrains Cav1.2 was unknown; PKGI\\u03b1 phosphorylation of \\u03b11C and \\u03b22a Ser496 was shown to inhibit current.\",\n      \"evidence\": \"In vitro kinase assay, phospho-specific antibodies, patch clamp, mutagenesis in HEK and myocytes\",\n      \"pmids\": [\"17626895\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo cardiac significance not tested\", \"Additional PKG sites not fully resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"How channel electrophysiology is tuned developmentally was unclear; Fox1/Fox2 were shown to direct alternative splicing of exons 9* and 33, generating variants with distinct properties.\",\n      \"evidence\": \"siRNA/overexpression, minigene reporters, RT-PCR in cortical neurons\",\n      \"pmids\": [\"19564422\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of each variant in vivo incomplete\", \"Other splice regulators not surveyed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Activity-dependent removal of Cav1.2 was uncharacterized; NMDAR-driven PIKfyve binding was shown to target the channel to lysosomes, linking degradation to excitotoxicity protection.\",\n      \"evidence\": \"Co-IP, live imaging, siRNA, fractionation, toxicity assays\",\n      \"pmids\": [\"19841139\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect PIKfyve binding unresolved\", \"Ubiquitin involvement not addressed here\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Determinants of Cav1.2 surface expression in vasculature were unknown; \\u03b12\\u03b4-1 was shown to be essential for membrane trafficking and myogenic tone.\",\n      \"evidence\": \"Surface biotinylation, shRNA, patch clamp, pressurized myography\",\n      \"pmids\": [\"19797702\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of \\u03b12\\u03b4-1-dependent trafficking not detailed\", \"Vascular-bed specificity unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"An N-terminal modulator of cardiac Cav1.2 was unknown; KChIP2 was shown to bind the N-terminus and modulate I_Ca,L, with compensatory CACNB2 upregulation upon loss.\",\n      \"evidence\": \"Co-IP, patch clamp, gene-chip/PCR in KChIP2 KO mice\",\n      \"pmids\": [\"19713767\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab interaction not reciprocally validated elsewhere in corpus\", \"Direct vs compensatory effect on current entangled\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Multiple trafficking and gating regulators were defined in cardiac and vascular myocytes: CaMKII/\\u03b22a gating-mode control, Rem GTPase gating arrest, Rab25 surface delivery, and ROS/NF-\\u03baB transcriptional control of channel abundance.\",\n      \"evidence\": \"Mutagenesis and single-channel/whole-cell electrophysiology in myocytes; immunoFRET; Ca2+/ROS imaging and reporter assays\",\n      \"pmids\": [\"20194790\", \"20616312\", \"27076616\", \"20616314\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Integration of these regulators in vivo incomplete\", \"ROS/NF-\\u03baB chain is indirect\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Whether Cav1.2 Ca2+ load drives pathological remodeling was unproven; \\u03b22a-mediated influx was shown sufficient to induce hypertrophy via calcineurin/NFAT and CaMKII/HDAC.\",\n      \"evidence\": \"Transgenic and adenoviral \\u03b22a overexpression with pathway inhibition and NFAT/HDAC translocation assays\",\n      \"pmids\": [\"21111744\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative weighting of two pathways unresolved\", \"Ca2+ pool source partially defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"How Cav1.2 reaches cardiac T-tubules and its relevance to heart failure was unknown; BIN1 was identified as the trafficking factor, reduced in failing hearts.\",\n      \"evidence\": \"Human myocyte imaging, T-tubule fractionation, patch clamp, mouse shRNA, zebrafish morpholino\",\n      \"pmids\": [\"22138472\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct BIN1\\u2013Cav1.2 binding interface not mapped\", \"Causality in human failure correlative\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Roles of Cav1.2 in development and non-excitable cells were unclear; influx-driven calcineurin signaling shapes jaw morphogenesis, and the Timothy syndrome G406R mutation acts dominantly via Fstl1/BMP signaling even without measurable currents.\",\n      \"evidence\": \"Mouse gain/loss-of-function, zebrafish, pharmacology; TS-Cav1.2 transgenic with Fstl1 analysis in hair follicle stem cells\",\n      \"pmids\": [\"23549079\", \"23752588\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of Ca2+-independent signaling in non-excitable cells incomplete\", \"Single-lab for TS hair follicle phenotype\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"An immune role was undefined; Cav1.2 was shown to be selectively expressed in TH2 lymphocytes where PKC-dependent activation controls Ca2+ entry and cytokine output.\",\n      \"evidence\": \"Antisense knockdown, PKC modulation, Ca2+ imaging, cytokine assays in primary human T cells\",\n      \"pmids\": [\"24365142\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Voltage-gating in non-excitable T cells unresolved\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"How basal and \\u03b2-adrenergic-stimulated cardiac current is set was unresolved; Ser1700 phosphorylation was shown essential for basal I_Ca,L and incremental \\u03b2-adrenergic potentiation in vivo.\",\n      \"evidence\": \"S1700A knock-in mice, patch clamp, cardiac function and exercise testing\",\n      \"pmids\": [\"25368181\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase(s) acting on Ser1700 in vivo not fully defined\", \"Interplay with Ser1928 not addressed here\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Store-operated coupling to Cav1.2 was unclear; Homer proteins were shown to bridge STIM1 to \\u03b11C, with Homer disruption enhancing Cav1.2 Ca2+ entry.\",\n      \"evidence\": \"Co-IP, Homer1 siRNA, dominant-negative peptide, Ca2+ imaging in HEK cells\",\n      \"pmids\": [\"25712868\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Native-tissue relevance untested\", \"Direct binding interfaces not mapped\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"A developmental survival role in auditory circuits was unknown; embryonic Cav1.2 deletion reduced auditory nuclei volume and cell number and altered LSO firing.\",\n      \"evidence\": \"Conditional KO, brainstem electrophysiology, volumetric/cell-count and ABR analysis\",\n      \"pmids\": [\"26242732\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular survival pathway not identified\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"The link between Cav1.2 and transcription/desensitization deepened: PKA-Ser1928 displaces \\u03b22AR to limit adrenergic responsiveness, NFAT5 and ROS-driven transcription control channel abundance, and behavioral/affective roles were dissected across brain regions and cell types.\",\n      \"evidence\": \"S1928A knock-in with Co-IP/electrophysiology; NFAT5 promoter binding and zebrafish rescue; region/temporally specific conditional KOs with behavior and plasticity assays\",\n      \"pmids\": [\"27103070\", \"27368804\", \"28696432\", \"27066530\", \"28165117\", \"27922594\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal links between channel regulation and specific behaviors partially correlative\", \"Developmental vs adult mechanisms not unified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Whether Cav1.2 signals to the nucleus independent of Ca2+ transport was unknown; depolarization was shown to drive Ras/ERK/CREB nuclear signaling via \\u03b22-subunit/H-Ras interaction, requiring pore Ca2+ occupancy but not flux.\",\n      \"evidence\": \"Channel mutants (Ca2+-impermeable, CaM-binding, W440A), recombinant H-Ras/\\u03b22 pulldowns, reporter assays in cell lines\",\n      \"pmids\": [\"30150369\", \"30176250\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo prevalence of flux-independent signaling unclear\", \"Downstream gene targets incompletely cataloged\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Auxiliary \\u03b2 subunits, transcriptional control by TDP-43, and ER\\u03b1/Mdm2-mediated ubiquitination were shown to govern Cav1.2 regulation, expression, and degradation across heart, pancreatic \\u03b2 cells, and neurons.\",\n      \"evidence\": \"\\u03b2-binding-deficient \\u03b11C transgenic and viral pharmacology; \\u03b2-cell Tardbp KO with Cav1.2 rescue; ubiquitin mutants, Mdm2 overexpression, proteasome inhibition in vivo\",\n      \"pmids\": [\"30422117\", \"31355778\", \"31012223\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Degradation pathway is single-lab\", \"Tissue-specific weighting of these mechanisms unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"How Cav1.2 integrates with Ca2+-release machinery in vascular microdomains was unclear; ANO1-Cav1.2-IP3R were shown to co-assemble to sustain serotonin-induced arterial contraction.\",\n      \"evidence\": \"Co-IP, superresolution microscopy, smooth-muscle ANO1 ablation, pharmacology, GCaMP imaging\",\n      \"pmids\": [\"37702787\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry of tripartite complex unknown\", \"Direct vs proximity-based interactions undistinguished\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"The microcircuit role of Cav1.2 in primate cognition was undefined; in dPFC spines it was localized near ER and coupled to SK3, producing an inverted-U dependence of firing on L-type channel activity for working memory.\",\n      \"evidence\": \"EM/light microscopy, pharmacology during unit recording in behaving macaques, transcriptomics\",\n      \"pmids\": [\"38776078\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal genetic manipulation in primates lacking\", \"Link to human disease alleles indirect\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the many context-specific Cav1.2 regulatory modules (kinase phosphosites, auxiliary subunits, trafficking/degradation routes, and flux-independent signaling) are coordinated within a single native complex and how disease alleles perturb that integration remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated structural model of the native macromolecular complex\", \"Mechanism unifying excitable and non-excitable signaling roles unknown\", \"Causal mapping from channel regulation to specific human phenotypes incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [8, 29, 5, 10]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 21, 4]},\n      {\"term_id\": \"GO:0005509\", \"supporting_discovery_ids\": [2, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [8, 13, 28, 37]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [4, 21]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [7, 27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 17, 21]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [29, 11, 22]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [4, 32, 38]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [11, 21, 19]}\n    ],\n    \"complexes\": [\n      \"Cav1.2 L-type calcium channel (\\u03b11C/\\u03b22/\\u03b12\\u03b4)\",\n      \"\\u03b22AR-Cav1.2 signaling complex\",\n      \"ANO1-Cav1.2-IP3R microdomain complex\"\n    ],\n    \"partners\": [\n      \"ADRB2\",\n      \"CALM1\",\n      \"CABP1\",\n      \"CACNB2\",\n      \"CACNA2D1\",\n      \"BIN1\",\n      \"HRAS\",\n      \"STIM1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}