{"gene":"CACNA1H","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2004,"finding":"Intrathecal antisense knockdown of Cav3.2 mRNA and protein in dorsal root ganglion neurons reduces 'Cav3.2-like' T-type currents and produces antinociceptive, anti-hyperalgesic, and anti-allodynic effects in rats, directly linking Cav3.2 to pain perception.","method":"Antisense oligodeoxynucleotide knockdown in vivo, electrophysiology, behavioral nociceptive assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockdown with molecular confirmation (mRNA/protein reduction), electrophysiological current reduction, and behavioral phenotype; replicated across multiple pain paradigms in a single rigorous study","pmids":["15616581"],"is_preprint":false},{"year":2014,"finding":"Cav3.2 T-type channels are ubiquitinated by the plasma-membrane-associated E3 ubiquitin ligase WWP1, which binds the intracellular domain III-IV linker region of Cav3.2 and modifies specific lysine residues there; the deubiquitinating enzyme USP5 also binds the III-IV linker (identified by proteomic screen), counteracts WWP1-mediated ubiquitination, stabilizes Cav3.2 protein levels, and maintains Cav3.2 whole-cell currents and nociceptive signaling.","method":"Proteomic screen, Co-IP, shRNA knockdown, whole-cell patch clamp, in vivo Tat peptide delivery with behavioral assays","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, proteomic identification, multiple orthogonal methods (shRNA, peptide uncoupling, electrophysiology, behavior) in one study","pmids":["25189210"],"is_preprint":false},{"year":2015,"finding":"The gain-of-function CACNA1H M1549V mutation drastically impairs Cav3.2 channel inactivation and shifts activation to more hyperpolarized potentials, increasing intracellular Ca2+ and driving autonomous aldosterone production, causing early-onset hypertension with primary aldosteronism.","method":"Exome sequencing, whole-cell patch clamp of mutant channels expressed in HEK cells, electrophysiological characterization","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — functional electrophysiological characterization of mutant channels with multiple biophysical parameters measured; mutation independently identified in five families and confirmed as de novo in two","pmids":["25907736"],"is_preprint":false},{"year":2008,"finding":"Transient selective upregulation of Cav3.2 mRNA and protein after status epilepticus increases T-type Ca2+ currents and burst firing; Cav3.2-null mice lack these changes and show dramatically reduced spontaneous seizures, neuron loss, and mossy fiber sprouting, establishing Cav3.2 transcriptional upregulation as a critical step in epileptogenesis.","method":"Cav3.2 knockout mice, qPCR, western blot, whole-cell patch clamp, in vivo EEG seizure monitoring, histopathology","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with multiple orthogonal readouts (molecular, electrophysiological, behavioral, histological) in a single rigorous study","pmids":["19052226"],"is_preprint":false},{"year":2006,"finding":"Cav3.2 channels are the primary molecular substrate for redox regulation of T-type Ca2+ currents in thalamic neurons: reducing agents selectively enhance Cav3.2 (but not Cav3.1 or Cav3.3) currents, and this enhancement is absent in Cav3.2-null mice.","method":"Patch clamp electrophysiology in native thalamic neurons and recombinant channels, Cav3.2 knockout mice","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — native neuron recordings confirmed with knockout mice and recombinant channel comparisons across all three Cav3 isoforms","pmids":["16644797"],"is_preprint":false},{"year":2004,"finding":"Childhood absence epilepsy-associated missense mutations F161L and E282K in Cav3.2 shift the half-activation potential ~10 mV hyperpolarized (allowing channel opening near resting potential); V831M slows inactivation ~50% and shifts half-inactivation ~10 mV depolarized—all increasing calcium influx during physiological activation.","method":"Site-directed mutagenesis of rat Cav3.2, whole-cell patch clamp in transfected HEK293 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro electrophysiology with mutagenesis; multiple mutations characterized with rigorous biophysical analysis in a single study","pmids":["14729682"],"is_preprint":false},{"year":2005,"finding":"Eleven of twelve CAE-associated Cav3.2 SNPs alter channel gating properties when introduced into recombinant channels; computer modeling predicts that seven increase neuronal firing (three inducing oscillations at absence-seizure frequencies) and three decrease firing, establishing these as susceptibility variants that alter channel function.","method":"Site-directed mutagenesis, whole-cell patch clamp in transfected cells, computational neuronal modeling","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Strong — systematic mutagenesis of all 12 variants with electrophysiology plus computational modeling; large-scale functional study","pmids":["15888660"],"is_preprint":false},{"year":2015,"finding":"N-linked glycosylation at asparagine N192 of Cav3.2 is critical for surface expression of the channel, whereas glycosylation at N1466 controls channel activity; N-glycosylation also underlies glucose-dependent potentiation of T-type current.","method":"Site-directed mutagenesis of N-glycosylation sites, surface biotinylation, whole-cell patch clamp in recombinant expression system","journal":"Pflugers Archiv","confidence":"High","confidence_rationale":"Tier 1 / Moderate — systematic mutagenesis with multiple orthogonal readouts (surface expression and electrophysiology) in a single rigorous study","pmids":["23503728"],"is_preprint":false},{"year":2009,"finding":"The high-affinity extracellular zinc/metal binding site on Cav3.2 is formed by a His-Gly-Asp motif in IS3-S4 (with H191 as critical histidine) together with an aspartate in IS2; this site stabilizes the closed conformation of the voltage-sensor paddle in repeat I to inhibit channel opening.","method":"Chimeric channel construction, site-directed mutagenesis, whole-cell patch clamp electrophysiology with zinc/metal block assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis and chimeric channels with functional assays systematically identify binding site residues","pmids":["19940152"],"is_preprint":false},{"year":2015,"finding":"In vivo phosphorylation mapping of Cav3.2 immunopurified from rat brain identified 34 phosphorylation sites; phosphorylation directly regulates channel gating including voltage-dependent activation, inactivation, and kinetics. A cluster at S442/S445/T446 in the loop I-II is crucial for this regulation, shown by alkaline phosphatase treatment and dephosphomimetic mutants.","method":"Immunopurification from rat brain, high-resolution mass spectrometry phosphoproteomics, site-directed mutagenesis, patch clamp electrophysiology","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo phosphorylation map by MS confirmed with mutagenesis and electrophysiology; multiple orthogonal methods","pmids":["26483470"],"is_preprint":false},{"year":2006,"finding":"PKA augments Cav3.2 channel activity (~40%) and negatively shifts steady-state inactivation; the PKA-mediated augmentation is localized to the II-III intracellular loop of Cav3.2, identified using chimeric channels with Nav1.4 segments.","method":"Xenopus oocyte expression, whole-cell patch clamp, pharmacological PKA activation/inhibition, chimeric channel construction","journal":"The Journal of pharmacology and experimental therapeutics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — chimeric channel domain mapping combined with pharmacological dissection and electrophysiology","pmids":["16569752"],"is_preprint":false},{"year":2009,"finding":"Gβγ dimers inhibit Cav3.2 channels in a voltage-independent manner that requires prior PKA phosphorylation of Ser1107 on the II-III loop; S1107A mutation prevents Gβγ inhibition without disrupting dimer binding. Dopamine inhibits Cav3.2 via synergistic D1/D2 receptor activation requiring both PKA and Gβγ.","method":"Site-directed mutagenesis (S1107A), single-channel and whole-cell patch clamp, recombinant Gβγ application, pharmacological dopamine receptor manipulation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis identifying critical serine plus mechanistic dissection with multiple pharmacological tools and electrophysiology","pmids":["19131331"],"is_preprint":false},{"year":2008,"finding":"CRFR1 activation by CRF or urocortin 1 selectively inhibits Cav3.2 (but not Cav3.1 or Cav3.3) currents via a cholera toxin-sensitive Gβγ-dependent mechanism; inhibition is independent of PLC, tyrosine kinases, CaMKII, or PKC, and manifests as a hyperpolarizing shift in steady-state inactivation.","method":"Whole-cell patch clamp, pharmacological dissection with pathway inhibitors, selective receptor antagonist (astressin), co-expression of CRFR1 with Cav3 isoforms","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — systematic pharmacological dissection of signaling pathway with electrophysiology; isoform selectivity established by parallel comparison","pmids":["18292205"],"is_preprint":false},{"year":2009,"finding":"NK1 receptor inhibits Cav3.2 channels through a voltage-independent Gαq/11-PLC-PKC signaling pathway; dominant-negative Gαq, RGS2/3T, U73122 (PLC inhibitor), and bisindolylmaleimide I (PKC inhibitor) each block the inhibition, whereas Gαt (Gβγ scavenger) does not.","method":"Co-expression in HEK293 cells, whole-cell patch clamp, dominant-negative constructs, pharmacological inhibitors of PLC and PKC","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — systematic pathway dissection using dominant-negative proteins and selective pharmacological inhibitors with electrophysiology","pmids":["19805509"],"is_preprint":false},{"year":2014,"finding":"Cav3.2 is required for tracheal chondrogenesis: Cav3.2-null mice have congenital tracheal stenosis due to incomplete cartilage formation. Ca2+ influx via Cav3.2 activates calcineurin/NFAT signaling, and NFAT binds a newly identified site in the Sox9 promoter to drive Sox9 expression during chondrogenesis.","method":"Cav3.2 knockout mice, Cav3.2 overexpression in ATDC5 cells, calcineurin/NFAT inhibitors, luciferase reporter assay, gel shift (EMSA), ChIP","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout phenotype confirmed mechanistically by overexpression, pharmacological inhibition, and transcriptional assays (EMSA + ChIP + luciferase)","pmids":["24778262"],"is_preprint":false},{"year":2012,"finding":"The transcription factor Egr1 activates the Cav3.2 (Cacna1h) promoter by binding to multiple Egr1 sites identified therein; REST (NRSF) counteracts Egr1 and represses Cav3.2 promoter activity and mRNA. Egr1 overexpression in vitro and in vivo increases Cav3.2 mRNA and T-type current.","method":"Promoter analysis, dual-luciferase reporter assay, chromatin immunoprecipitation (ChIP) in NG108-15 cells and mouse hippocampi, whole-cell patch clamp","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP in both cell line and in vivo tissue, promoter reporter assays, and electrophysiological confirmation; multiple orthogonal methods","pmids":["22431737"],"is_preprint":false},{"year":2016,"finding":"Electrophysiological analysis of four novel CACNA1H variants associated with different forms of primary aldosteronism (p.Met1549Ile, p.Ser196Leu, p.Pro2083Leu, p.Val1951Glu) all show significant gain-of-function changes in Ca2+ current properties; transfection of mutant Cav3.2 in H295R-S2 cells increases aldosterone production and expression of steroidogenic enzymes after K+ stimulation.","method":"Whole-cell patch clamp of mutant channels in HEK cells, aldosterone production assay (ELISA), gene expression in adrenocortical cells","journal":"EBioMedicine","confidence":"High","confidence_rationale":"Tier 2 / Moderate — functional electrophysiology plus cellular aldosterone production assay; four independent variants all showing same direction of effect","pmids":["27729216"],"is_preprint":false},{"year":2016,"finding":"CACNA1H M1549V expressed in HAC15 adrenocortical cells increases aldosterone production 7-fold and CYP11B2 expression; the T-type channel blocker mibefradil completely abrogates both effects, directly linking gain-of-function Cav3.2 activity to autonomous aldosterone production.","method":"Heterologous expression in HAC15 cells, aldosterone ELISA, real-time PCR for CYP11B2, pharmacological inhibition with mibefradil","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — cell transfection with quantitative aldosterone and gene expression endpoints plus pharmacological rescue with selective blocker","pmids":["27258646"],"is_preprint":false},{"year":2017,"finding":"Calnexin, an ER integral membrane protein, interacts with the III-IV linker region of Cav3.2 to modulate channel sorting to the cell surface; the GAERS missense mutation R1584P in the III-IV linker disrupts the Cav3.2/calnexin interaction, resulting in increased Cav3.2 surface expression and elevated calcium influx.","method":"Co-immunoprecipitation, surface biotinylation, whole-cell patch clamp, recombinant channel expression","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating physical interaction, surface expression quantification, and electrophysiological confirmation; mechanistic linkage between calnexin interaction and trafficking established","pmids":["28912545"],"is_preprint":false},{"year":2013,"finding":"Egr1 binds directly to the Cav3.2 promoter region 41-81 bp upstream of the TSS following transverse aortic banding (pressure overload); Egr1 knockdown prevents phenylephrine-induced Cav3.2 upregulation and cardiac hypertrophy, while Cav3.2 overexpression rescues the hypertrophic response in Egr1-knockdown cells.","method":"ChIP, EMSA, in vivo cardiac gene transfer with reporter constructs, siRNA knockdown, neonatal rat ventricular myocyte hypertrophy assay","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo ChIP and EMSA identify binding site; genetic knockdown and rescue experiment confirm functional role; multiple orthogonal methods","pmids":["23929524"],"is_preprint":false},{"year":2013,"finding":"Calcineurin physically interacts with Cav3.2; Ca2+ and calmodulin modulate this interaction. Calcineurin binding to Cav3.2 decreases calcineurin phosphatase activity and reduces Cav3.2 current density. A cell-permeable peptide mimicking the calcineurin-binding site of Cav3.2 reduces phenylephrine-induced cardiac hypertrophy.","method":"Co-immunoprecipitation, patch clamp electrophysiology, calcineurin phosphatase activity assay, cell-permeable peptide in neonatal cardiac myocytes","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP, functional enzyme assay, electrophysiology, and peptide inhibition provide multiple orthogonal lines of evidence","pmids":["23669360"],"is_preprint":false},{"year":2015,"finding":"Cav3.2 is selectively expressed in Aδ- and C-low-threshold mechanoreceptors (LTMRs) innervating hair follicles; C-LTMR-specific Cav3.2 knockout reveals that Cav3.2 regulates light-touch perception, noxious mechanical/cold/chemical sensations, and is essential for allodynic symptoms of neuropathic pain.","method":"Knockin/flox mouse expressing Cav3.2-GFP fusion, C-LTMR-specific conditional knockout, behavioral sensory testing, confocal imaging of fiber trajectories","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout with cell-type-specific resolution and multiple behavioral modalities; knockin GFP fusion for localization","pmids":["25600872"],"is_preprint":false},{"year":2015,"finding":"CaV3.2 channels preferentially incorporate into synapses and control NMDA receptor-mediated transmission in an activity-dependent manner by local calcium influx. Expression of the CAE-linked hCaV3.2(C456S) mutant (higher open probability) enhances glutamatergic transmission and induces 2-4 Hz spike-wave discharges (absence-like epilepsy) in rats when expressed in cortex.","method":"Electrophysiological recordings at rat central synapses, in vivo cortical expression of mutant channels, EEG recordings, AMPA-R and NMDA-R antagonists","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — synaptic electrophysiology, in vivo expression, EEG, and pharmacological rescue with receptor antagonists in a single study","pmids":["26220996"],"is_preprint":false},{"year":2009,"finding":"The GAERS Cacna1h R1584P (gcm) missense mutation requires the presence of exon 25 to produce gain-of-function effects (faster recovery from inactivation, greater charge transference during high-frequency bursts); without exon 25, the mutation has no significant functional effect, demonstrating splice-variant-dependent epistasis.","method":"Site-directed mutagenesis of splice variants (with/without exon 25), whole-cell patch clamp in transfected cells, genetic segregation analysis in GAERS×Brown Norway F2 cross","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis in defined splice backgrounds with electrophysiology; segregation analysis showing codominant segregation with seizure severity","pmids":["19144837"],"is_preprint":false},{"year":2013,"finding":"C456S Cav3.2 epilepsy mutant channels increase neuronal excitability by raising spontaneous firing and lowering burst-firing threshold; the I-II loop region increases channel surface expression without altering dendritic distribution; C456S also promotes dendritic growth via Ca2+-regulated transcriptional changes, all reversed by ethosuximide or TTA-P2.","method":"Recombinant channel expression in cultured neurons, whole-cell patch clamp, immunocytochemistry, dendritic morphometry, transactivator trap (CaRE) assay, pharmacological reversal","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (electrophysiology, surface expression, morphology, transcriptional assay, pharmacological rescue) in a single study","pmids":["24277868"],"is_preprint":false},{"year":2010,"finding":"Nitrous oxide selectively inhibits Cav3.2 T-type channels via a free radical mechanism: H191 on the extracellular face of Cav3.2 participates in a metal-binding site that generates reactive oxygen species in the presence of N2O, causing localized oxidation of H191. Cav3.2-null mice show reduced N2O analgesia in formalin-induced pain.","method":"Site-directed mutagenesis (H191), metal chelators, catalase and SOD/catalase mimetics, patch clamp, Cav3.2 knockout mouse behavioral assays","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — mutagenesis identifies critical residue; chemical probes establish ROS intermediates; knockout mice confirm in vivo relevance","pmids":["21059758"],"is_preprint":false},{"year":2014,"finding":"H2S selectively inhibits Cav3.2 (not Cav3.1 or Cav3.3) via the extracellular residue H191; chelation of Zn2+ prevents and reverses H2S inhibition, suggesting H2S increases the affinity of the channel for extracellular Zn2+ binding at the H191 site.","method":"Whole-cell patch clamp of heterologously expressed Cav3 isoforms in HEK293 cells, Zn2+ chelator (TPEN), native DRG neuron recordings, H191 mutant analysis","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — isoform selectivity established by parallel comparison; H191 residue requirement determined; Zn2+ chelation rescue mechanistically informative; multiple cell systems tested","pmids":["25183670"],"is_preprint":false},{"year":2013,"finding":"Carbon monoxide (CO, derived from HO-1) inhibits Cav3.2 T-type channels via an extracellular redox-sensitive site; thioredoxin (Trx) tonically maintains Cav3.2 channel activity at this site. Trx depletion reduces Cav3.2 currents and diminishes CO sensitivity. Cav3.1 and Cav3.3 are unaffected.","method":"Patch clamp in HEK293 cells expressing Cav3.1-3.3, CORM-2 application, auranofin (Trx depletion), native NG108-15 and DRG neuron recordings","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — isoform selectivity confirmed across all three Cav3 subtypes; Trx modulation established pharmacologically in multiple cell systems","pmids":["23671274"],"is_preprint":false},{"year":2015,"finding":"CaV3.2 channels in resistance arteries restrain myogenic constriction through a CaV3.2→ryanodine receptor→BKCa negative feedback axis: genetic deletion of CaV3.2 enhances myogenic tone, reduces spontaneous transient outward K+ currents (BKCa activity), and abolishes Ca2+ sparks normally evoked by CaV3.2 activity.","method":"CaV3.2 knockout mice, pressurized vessel myography, patch clamp electrophysiology (BKCa STOCs), Fluo-4 Ca2+ spark imaging in en face arteries","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout confirmed pharmacologically (Ni2+ specificity absent in KO); multiple orthogonal readouts (myography, electrophysiology, Ca2+ imaging)","pmids":["26069238"],"is_preprint":false},{"year":2011,"finding":"Presynaptic HCN1 channels colocalize with Cav3.2 at active zones of axon terminals onto entorhinal cortical layer III pyramidal neurons; HCN channels suppress glutamate release by inhibiting presynaptic Cav3.2 T-type Ca2+ channel activity.","method":"Electron microscopy (immunogold colocalization), electrophysiology, pharmacological dissection, HCN1 knockout mice","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — ultrastructural colocalization by EM plus functional electrophysiology and genetic knockout converge on same mechanism","pmids":["21358644"],"is_preprint":false},{"year":2021,"finding":"MTF1 directly activates Cacna1h transcription in COCH neurons of ventral CA3 hippocampus; this MTF1-Cacna1h axis enables burst firing in COCH neurons and drives social-stress-induced anxiety-like behaviors via synapses onto GABAergic neurons in the lateral septum.","method":"Genetic targeting of COCH neurons, ChIP/transcriptional assays for MTF1-Cacna1h, optogenetics, electrophysiology, behavioral tests","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — circuit and transcriptional evidence in a single study; MTF1-Cacna1h interaction established but abstract is concise about mechanistic details","pmids":["34965426"],"is_preprint":false},{"year":2019,"finding":"SUMOylation of USP5 at lysine K113 (via SUMO2/3) reduces USP5 affinity for Cav3.2; peripheral nerve injury decreases USP5 SUMOylation in DRG, thereby increasing USP5-Cav3.2 binding and Cav3.2 channel activity.","method":"Co-immunoprecipitation of Cav3.2 with USP5 mutants (K113R), site-directed mutagenesis, expression in tsA-201 cells, immunoblot of endogenous DRG proteins","journal":"Molecular brain","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP and mutagenesis identify K113 as SUMO site; functional consequence on channel activity inferred indirectly; single lab","pmids":["31455361"],"is_preprint":false},{"year":2017,"finding":"Interleukin-1β administration increases USP5-Cav3.2 interaction in spinal dorsal horn (by Co-IP); disruption of this interaction with Tat peptides suppresses IL-1β-induced nocifensive responses, identifying IL-1β as an upstream trigger for USP5-Cav3.2 upregulation in the pain pathway.","method":"Co-immunoprecipitation from spinal tissue, intrathecal IL-1β administration, Tat peptide delivery, DRG neuron cultures, behavioral assays","journal":"Molecular pain","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP in tissue plus pharmacological peptide intervention with behavioral endpoints; single lab","pmids":["28741432"],"is_preprint":false},{"year":2005,"finding":"In rat chromaffin cells, chronic cAMP exposure recruits Cav3.2 (α1H) T-type channels via an Epac-mediated pathway; the newly recruited T-type channels support 'low-threshold exocytosis' evoked at potentials as low as −50 mV, an effect blocked by 50 µM Ni2+ (selective T-type blocker at this concentration).","method":"RT-PCR (isoform identification), capacitance measurements of exocytosis, Ni2+ pharmacology, patch clamp, chronic cAMP treatment of rat chromaffin cells","journal":"Biophysical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Cav3.2 isoform identified by RT-PCR; exocytosis-channel link established pharmacologically with Ni2+ selectivity; single lab","pmids":["16361341"],"is_preprint":false},{"year":2013,"finding":"BK channels and Cav3.2 form macromolecular complexes in LNCaP prostate cancer cells (demonstrated by Co-IP); BK channels set resting membrane potential at ~-40 mV, promoting constitutive Ca2+ entry through Cav3.2, which together drive cell proliferation.","method":"Single-channel recording, confocal imaging, co-immunoprecipitation, siRNA knockdown, flow cytometry (cell cycle), cell survival assay","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP demonstrates physical interaction; functional link through siRNA and pharmacology; single lab","pmids":["24143281"],"is_preprint":false},{"year":2010,"finding":"ACTH induces Cav3.2 current and CACNA1H mRNA in adrenal zona fasciculata cells by mechanisms only partly dependent on cAMP; cAMP analogs increase CACNA1H mRNA but not Ca2+ current; 8CPT-cAMP metabolites (including 8CPT-adenosine) increase both mRNA and current, revealing a cAMP-independent pathway for Cav3.2 upregulation by ACTH.","method":"Northern blot, whole-cell patch clamp in bovine AZF cells, pharmacological cAMP analog panel","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic pharmacological dissection distinguishing cAMP-dependent vs. -independent regulation; single lab with electrophysiology and Northern blot","pmids":["20424171"],"is_preprint":false},{"year":2009,"finding":"MCP-1 directly inhibits Cav3.2 channels with nanomolar affinity independently of CCR2 receptor activation; this direct inhibition is sensitive to divalent metal ion chelator DTPA, suggesting metal ions as a cofactor. MCP-1 also inhibits native T-type currents in acutely dissociated DRG neurons.","method":"Whole-cell patch clamp of Cav3 isoforms in tsA-201 cells, heat denaturation controls, DTPA chelation, DRG neuron recordings","journal":"Molecular pharmacology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — isoform selectivity established; direct channel effect shown; native DRG neurons confirm; but binding site not identified; single lab","pmids":["19864434"],"is_preprint":false},{"year":2018,"finding":"Melatonin inhibits Cav3.2 T-type channels in trigeminal ganglion neurons via MT2 receptor → Gαo (pertussis toxin-sensitive) → Gβγ → novel PKCη signaling; PKCη antagonism or knockdown prevents melatonin effects; MT2 activation selectively inhibits Cav3.2 but not Cav3.1 or Cav3.3 in heterologous expression.","method":"Patch clamp in TG neurons and heterologous expression, co-IP of MT2/Gαo, QEHA peptide, shRNA knockdown of Gαo and PKCη, behavioral inflammatory pain model","journal":"Journal of pineal research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic pathway dissection with multiple inhibitors, co-IP, and isoform selectivity confirmed in heterologous system; single lab","pmids":["29437250"],"is_preprint":false},{"year":2021,"finding":"Neuromedin B receptor (NmbR) selectively potentiates Cav3.2 (not Cav3.1 or Cav3.3) currents in trigeminal ganglion neurons via Gq-coupled Gβγ → AMPK → PKA signaling cascade; AMPK inhibition prevents Nmb-induced increase in PKA activity; Cav3.2 siRNA knockdown abolishes NmbR-driven pain hypersensitivity in vivo.","method":"Patch clamp in TG neurons and heterologous system, QEHA peptide, shRNA of Gβ, AMPK/PKA inhibitors, phospho-AMPK western blot, behavioral inflammatory pain model with Cav3.2 siRNA","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multi-step signaling pathway dissected with multiple inhibitors; isoform selectivity confirmed; in vivo siRNA validates Cav3.2 requirement; single lab","pmids":["34646374"],"is_preprint":false},{"year":2013,"finding":"CaV3.2 channel opening during ischemia (OGD) contributes Ca2+ that is transmitted to mitochondria, causing deleterious mitochondrial Ca2+ overload; Cav3.2 overexpression worsens ischemic toxicity and mitochondrial Ca2+ loading, while Ni2+ block and Cav3.1/Cav3.2 siRNA are protective.","method":"Ca2+ imaging (cytosolic and mitochondrial) in PC12 cells, Cav3.2 overexpression and siRNA knockdown, Ni2+ pharmacology, ATP measurement, cell death assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — overexpression and knockdown with multiple readouts; mitochondrial uniporter manipulation confirms Ca2+ routing; single lab","pmids":["23508951"],"is_preprint":false},{"year":2007,"finding":"Cav3.2 T-type Ca2+ current is the molecular determinant of GABA-induced excitability in a subset of adult sensory neurons: Cav3.2-null mice lack T-type current and show no GABAA receptor-induced action potential firing or intracellular Ca2+ increase in this neuron subset.","method":"Cav3.2 knockout mice, patch clamp, intracellular Ca2+ imaging, GABAA receptor pharmacology","journal":"Molecular and cellular neurosciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with electrophysiology and Ca2+ imaging confirms Cav3.2 as the required molecular substrate; single lab","pmids":["17716912"],"is_preprint":false},{"year":2014,"finding":"CaV3.2 channels in carotid body glomus cells mediate the H2S-dependent hypoxic Ca2+ response: CaV3.2 knockout mice show markedly attenuated hypoxia-evoked intracellular Ca2+ increases, catecholamine secretion, and sensory nerve excitation; NaHS (H2S donor) effects are also markedly reduced in Cacna1h-/- mice.","method":"Cav3.2 knockout mice, intracellular Ca2+ imaging in glomus cells, catecholamine secretion assay, carotid body sensory nerve recording, pharmacological T-type blockers","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout plus pharmacological blockers with multiple physiological readouts; single lab","pmids":["25377087"],"is_preprint":false},{"year":2018,"finding":"Cav3.2 channels at the axon initial segment of mature dentate granule cells are responsible for burst firing: Cav3.2 knockout mice fire tonic spikes instead of bursts, exhibit impaired synaptic plasticity, and show reduced dentate-to-CA3 communication.","method":"Cav3.2 knockout mice, patch clamp electrophysiology in granule cells, synaptic plasticity recordings, axon initial segment localization","journal":"Cerebral cortex","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with electrophysiological and synaptic readouts; localization to axon initial segment; single lab","pmids":["29790938"],"is_preprint":false},{"year":2004,"finding":"Cav3.2 is the predominant T-type Ca2+ channel subtype expressed in embryonic mouse heart (E9.5 and E18), as determined by quantitative PCR; Cav3.2 mRNA predominates over Cav3.1 during embryonic period, then switches to Cav3.1 predominance in adulthood; T-type currents in embryonic ventricular myocytes are sensitive to low Ni2+ concentrations (IC50 26-31 µM), consistent with Cav3.2.","method":"Quantitative PCR, whole-cell patch clamp with Ni2+ pharmacology in acutely isolated mouse ventricular myocytes at developmental stages","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — qPCR plus electrophysiology with pharmacological Ni2+ selectivity; Cav3.2 and Cav3.1 directly compared; single lab","pmids":["14988077"],"is_preprint":false},{"year":2013,"finding":"Immunoelectron microscopy demonstrates that Cav3.2 protein is expressed in soma and peripheral axons of small-diameter (nociceptive, IB4+, CGRP+) DRG neurons and in unmyelinated sciatic nerve fibers, as well as in peripheral nerve endings of hind-paw skin.","method":"Polyclonal Cav3.2 antibody, confocal immunofluorescence, electron microscopy with immunogold labeling, co-localization with nociceptor markers","journal":"Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunogold EM provides subcellular resolution; new isoform-selective antibody used; single lab","pmids":["23867767"],"is_preprint":false},{"year":2013,"finding":"S-nitrosothiols (SNOs such as GSNO) inhibit CaV3.2 T-type channels in DRG neurons by acting on putative extracellular cysteine thiol residues in repeats I and II; a quadruple Cys-Ala mutant at these sites abolishes GSNO inhibition without affecting voltage dependence.","method":"Site-directed mutagenesis (quadruple Cys-Ala in repeats I/II), patch clamp in DRG neurons and HEK cells, N-ethylmaleimide pretreatment, guanylyl cyclase inhibitor controls","journal":"Molecular neurobiology","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis identifies specific Cys residues in native-channel context; mechanism confirmed pharmacologically; single lab","pmids":["23813099"],"is_preprint":false},{"year":2009,"finding":"H2S (NaHS) activates or sensitizes Cav3.2 T-type channels expressed in primary afferents and spinal nociceptive neurons, causing hyperalgesia; antisense knockdown of Cav3.2 protein in DRG and spinal cord attenuates both intrathecal and intraplantar NaHS-induced hyperalgesia, while zinc chloride (preferential Cav3.2 blocker) and mibefradil reproduce this effect.","method":"Antisense oligodeoxynucleotide knockdown, Western blot for Cav3.2 protein, paw pressure nociceptive threshold, pharmacological (zinc chloride, mibefradil)","journal":"Pain","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — antisense knockdown with protein confirmation and behavioral readout; pharmacological validation with multiple agents; single lab","pmids":["19167819"],"is_preprint":false},{"year":2022,"finding":"miR-32-5p directly targets Cav3.2 mRNA in trigeminal ganglion neurons; nerve injury causes histone methylation (H3K9me2, H3K27me3) at the miR-32-5p promoter, suppressing miR-32-5p and de-repressing Cav3.2 protein and T-type currents to drive trigeminal neuropathic pain.","method":"High-throughput miRNA sequencing, qPCR, histone methyltransferase inhibitors, lentiviral miR-32-5p overexpression, Western blot, patch clamp, behavioral pain assays","journal":"PNAS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct targeting established with overexpression and electrophysiology; chromatin mechanism supported by inhibitor data; single lab","pmids":["35353623"],"is_preprint":false},{"year":2020,"finding":"A somatic CACNA1H I1430T mutation in aldosterone-producing adenoma, when expressed in HAC15 cells via inducible system, increases CYP11B2 mRNA and aldosterone production, supporting its role as a driver of autonomous aldosterone secretion.","method":"CYP11B2-guided exome sequencing, doxycycline-inducible CACNA1H I1430T expression in HAC15 cells, CYP11B2 qPCR, aldosterone ELISA","journal":"Hypertension","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — inducible expression system with quantitative functional readouts in relevant adrenocortical cell line; single lab","pmids":["31983310"],"is_preprint":false},{"year":2021,"finding":"Cacna1h knockin (M1549V) mice have increased aldosterone:renin ratios, elevated adrenal Cyp11b2 expression (not suppressed by high salt), and 8 mmHg higher systolic blood pressure than wild-type; adrenal glomerulosa cells from knockin mice show increased baseline and peak intracellular Ca2+ concentrations, establishing elevated intracellular Ca2+ as the mechanistic link between gain-of-function Cav3.2 and aldosterone overproduction.","method":"CRISPR/Cas9 knockin and knockout mice, blood pressure telemetry, aldosterone/renin assay, adrenal slice Ca2+ imaging (zona glomerulosa), qPCR","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockin and knockout with multiple physiological endpoints plus direct Ca2+ imaging in the relevant tissue; mechanistic chain from channel mutation to Ca2+ to aldosterone established","pmids":["33879608"],"is_preprint":false}],"current_model":"Cav3.2 (CACNA1H) is a low-voltage-activated T-type calcium channel whose gating is regulated by PKA phosphorylation (II-III loop, S1107), Gβγ dimers, redox agents (via extracellular H191), N-linked glycosylation (N192 for surface expression, N1466 for activity), calcineurin binding, and multiple GPCRs (CRFR1, NK1R, MT2R, NmbR); it is ubiquitinated by WWP1 at the III-IV linker and stabilized by USP5 (regulated by SUMOylation at K113), controlling its plasma membrane levels and nociceptive signaling; in the pain pathway Cav3.2 is the primary T-type isoform in nociceptive DRG neurons and spinal dorsal horn, where upregulation drives inflammatory and neuropathic pain; in the brain it supports burst firing and thalamocortical oscillations; its gain-of-function increases NMDA receptor-mediated transmission and can cause absence epilepsy; in the adrenal gland it mediates Ca2+ influx that drives aldosterone production via calcineurin/NFAT signaling, and gain-of-function mutations cause primary aldosteronism; it is also essential for tracheal chondrogenesis (via calcineurin/NFAT/Sox9), cardiac automaticity (upregulated by Egr1/REST transcriptional regulation), and arterial myogenic tone (via a CaV3.2→ryanodine receptor→BKCa negative feedback axis)."},"narrative":{"mechanistic_narrative":"CACNA1H encodes Cav3.2, a low-voltage-activated T-type calcium channel that converts membrane depolarization near resting potential into Ca2+ influx, supporting burst firing, nociceptive signaling, and Ca2+-driven gene programs across neurons, adrenal cortex, cartilage, heart, and vasculature [PMID:15616581, PMID:19052226, PMID:24778262]. Its biophysical gating is tuned by a dense regulatory layer: in vivo phosphorylation at 34 sites (including a I-II loop cluster S442/S445/T446) shapes activation and inactivation [PMID:26483470], PKA augments current via the II-III loop and licenses voltage-independent Gβγ inhibition through Ser1107 [PMID:16569752, PMID:19131331], and an extracellular metal-binding site organized around His191 in IS3-S4 mediates selective redox modulation by zinc, nitrous oxide, H2S, and CO that distinguishes Cav3.2 from Cav3.1/Cav3.3 [PMID:19940152, PMID:21059758, PMID:25183670, PMID:23671274]. Channel surface density is set by competing trafficking and stability machinery: N-glycosylation at N192 governs surface expression and N1466 governs activity [PMID:23503728], calnexin binding at the III-IV linker controls ER sorting [PMID:28912545], and the same linker is ubiquitinated by WWP1 and deubiquitinated/stabilized by USP5, a balance that controls plasma-membrane levels and pain signaling [PMID:25189210]. In nociceptive Aδ/C-fiber DRG and trigeminal neurons, Cav3.2 is the dominant T-type isoform and its upregulation drives inflammatory and neuropathic pain, with knockdown producing analgesia [PMID:15616581, PMID:25600872, PMID:23867767]; multiple GPCRs and inflammatory mediators converge on the channel to modulate this output [PMID:18292205, PMID:19805509, PMID:29437250, PMID:34646374]. Gain-of-function gating changes are pathogenic in two settings: mutations that hyperpolarize activation or slow inactivation (e.g., F161L, E282K, M1549V, C456S) increase neuronal Ca2+ influx and NMDA receptor-mediated transmission to cause absence epilepsy [PMID:14729682, PMID:15888660, PMID:26220996], while gain-of-function mutations such as M1549V raise glomerulosa intracellular Ca2+ to drive CYP11B2-dependent aldosterone production, causing primary aldosteronism [PMID:25907736, PMID:27729216, PMID:33879608]. Beyond these, Cav3.2-derived Ca2+ activates calcineurin/NFAT/Sox9 signaling required for tracheal chondrogenesis [PMID:24778262] and feeds a CaV3.2→ryanodine receptor→BKCa negative-feedback axis restraining arterial myogenic tone [PMID:26069238].","teleology":[{"year":2004,"claim":"Established that Cav3.2 itself, not merely a generic T-type current, drives nociception, providing the founding gene-function link for the pain field.","evidence":"Intrathecal antisense knockdown in rat DRG with electrophysiology and behavioral pain assays","pmids":["15616581"],"confidence":"High","gaps":["Does not resolve subcellular site of action","Antisense specificity vs other Cav3 isoforms not fully excluded"]},{"year":2004,"claim":"Defined how human absence-epilepsy mutations alter channel biophysics, linking specific gating shifts to pathogenic Ca2+ influx near rest.","evidence":"Site-directed mutagenesis (F161L, E282K, V831M) and whole-cell patch clamp in HEK293","pmids":["14729682"],"confidence":"High","gaps":["In vitro only; no in vivo seizure correlation","Splice-variant context not tested"]},{"year":2005,"claim":"Systematically scaled the genotype-to-gating analysis, showing most CAE variants alter gating and predicting their net effect on firing, establishing them as functional susceptibility alleles.","evidence":"Mutagenesis of 12 variants, patch clamp, and computational neuronal modeling","pmids":["15888660"],"confidence":"High","gaps":["Firing predictions are computational","No animal validation in this study"]},{"year":2006,"claim":"Identified Cav3.2 as the selective molecular substrate for redox modulation of T-type current and mapped PKA augmentation to the II-III loop, opening the channel's regulatory-domain architecture.","evidence":"Native thalamic neuron and recombinant recordings with Cav3.2-null mice; chimeric Nav1.4/Cav3.2 channels in oocytes","pmids":["16644797","16569752"],"confidence":"High","gaps":["Redox sensor residue not yet identified in 2006","PKA target residue not yet mapped"]},{"year":2009,"claim":"Resolved the molecular logic of GPCR and Gβγ regulation, showing PKA phosphorylation of Ser1107 is a prerequisite for voltage-independent Gβγ inhibition, and identified the His191 metal-binding pocket controlling gating.","evidence":"S1107A mutagenesis with single-channel recording; chimera/mutagenesis zinc-block assays","pmids":["19131331","19940152","18292205","19805509"],"confidence":"High","gaps":["Stoichiometry of Gβγ binding vs phosphorylation not quantified","Physiological GPCR coupling in native nociceptors inferred from heterologous systems"]},{"year":2008,"claim":"Demonstrated that transcriptional upregulation of Cav3.2 is a causal step in epileptogenesis, moving the channel from biophysical correlate to driver of network pathology.","evidence":"Cav3.2-null mice with qPCR, patch clamp, EEG, and histopathology after status epilepticus","pmids":["19052226"],"confidence":"High","gaps":["Upstream transcriptional trigger not identified in this study","Cell types responsible not dissected"]},{"year":2010,"claim":"Mechanistically explained gasotransmitter and anesthetic modulation by showing His191 forms a metal/ROS-sensitive site, unifying N2O, H2S, CO, and S-nitrosothiol regulation of Cav3.2.","evidence":"H191 and cysteine mutagenesis, ROS scavengers, Zn2+ chelation, native DRG recordings, Cav3.2-null behavior","pmids":["21059758","25183670","23671274","23813099"],"confidence":"High","gaps":["Endogenous redox tone regulating the site in vivo not fully quantified","Whether thioredoxin acts directly on H191 unresolved"]},{"year":2012,"claim":"Identified the transcriptional control of Cacna1h by an Egr1 (activator)/REST (repressor) module, providing the gene-regulatory layer governing channel abundance.","evidence":"Promoter reporter assays, ChIP in cells and mouse hippocampus, electrophysiology","pmids":["22431737"],"confidence":"High","gaps":["Tissue-specific deployment of this module not mapped","Signals upstream of Egr1/REST not defined here"]},{"year":2013,"claim":"Extended the regulatory network to cardiac hypertrophy and Ca2+/calmodulin signaling, showing Egr1-driven Cav3.2 upregulation under pressure overload and a reciprocal Cav3.2-calcineurin physical interaction.","evidence":"ChIP/EMSA, in vivo cardiac gene transfer, siRNA/rescue; Co-IP and calcineurin phosphatase activity assays with peptide inhibition","pmids":["23929524","23669360"],"confidence":"High","gaps":["Calcineurin-binding site on Cav3.2 not residue-mapped","Causality of Cav3.2 in adult cardiac disease in vivo not fully established"]},{"year":2014,"claim":"Showed Cav3.2-derived Ca2+ drives a developmental transcriptional program (calcineurin/NFAT/Sox9) required for chondrogenesis, broadening the channel's role beyond excitable signaling.","evidence":"Cav3.2-null mice, ATDC5 overexpression, NFAT inhibitors, luciferase/EMSA/ChIP on Sox9 promoter","pmids":["24778262"],"confidence":"High","gaps":["How Ca2+ influx is gated in non-excitable chondrocytes unclear","Other NFAT target genes not surveyed"]},{"year":2014,"claim":"Defined the trafficking/stability machinery controlling surface Cav3.2, identifying WWP1 ubiquitination and USP5 deubiquitination at the III-IV linker as the determinant of pain-relevant channel density.","evidence":"Proteomic screen, reciprocal Co-IP, shRNA, Tat peptide uncoupling, patch clamp and behavior","pmids":["25189210"],"confidence":"High","gaps":["Specific ubiquitinated lysines only partially defined","Regulation of WWP1/USP5 activity in disease states addressed later"]},{"year":2015,"claim":"Provided the in vivo phosphorylation map and post-translational/trafficking controls (glycosylation, calnexin), defining how channel gating and surface delivery are set biochemically.","evidence":"Brain immunopurification phosphoproteomics with mutagenesis; N-glycosylation mutagenesis with biotinylation; calnexin Co-IP and surface assays","pmids":["26483470","23503728","28912545"],"confidence":"High","gaps":["Kinases responsible for individual sites largely unassigned","Quantitative contribution of each site to native current unknown"]},{"year":2015,"claim":"Connected gain-of-function gating directly to disease physiology: M1549V drives autonomous aldosterone production, and CAE-linked C456S enhances synaptic NMDA transmission and induces spike-wave discharges in vivo.","evidence":"Exome sequencing and patch clamp of mutants; synaptic recordings, in vivo cortical expression, EEG; cell-type-specific Cav3.2 conditional knockout","pmids":["25907736","26220996","25600872"],"confidence":"High","gaps":["How channel localizes to synapses/active zones mechanistically incomplete","Translation of rodent epilepsy phenotype to human variant penetrance not addressed"]},{"year":2016,"claim":"Generalized the aldosteronism mechanism across multiple CACNA1H variants and demonstrated pharmacological reversibility, linking channel gain-of-function to CYP11B2 induction.","evidence":"Patch clamp of four variants plus M1549V in adrenocortical cells, aldosterone ELISA, CYP11B2 PCR, mibefradil rescue","pmids":["27729216","27258646"],"confidence":"High","gaps":["Cellular Ca2+ signaling chain not yet directly imaged here","Adrenal in vivo confirmation came later"]},{"year":2021,"claim":"Closed the mechanistic chain in primary aldosteronism in vivo, showing knockin M1549V raises glomerulosa intracellular Ca2+, aldosterone, and blood pressure.","evidence":"CRISPR knockin/knockout mice, BP telemetry, aldosterone/renin assays, adrenal slice Ca2+ imaging","pmids":["33879608"],"confidence":"High","gaps":["Downstream Ca2+ effector pathway to CYP11B2 in vivo not fully dissected","Modest BP effect leaves room for compensatory mechanisms"]},{"year":2022,"claim":"Identified epigenetic/miRNA control of Cav3.2 in neuropathic pain, showing chromatin-silencing of miR-32-5p de-represses Cav3.2 to drive trigeminal pain.","evidence":"miRNA sequencing, histone methyltransferase inhibitors, lentiviral miRNA overexpression, patch clamp, behavior; plus USP5-SUMO and IL-1β/USP5 pain studies","pmids":["35353623","31455361","28741432"],"confidence":"Medium","gaps":["Single-lab findings without independent replication","Relative contribution of transcriptional vs trafficking control to pain-state upregulation unresolved"]},{"year":null,"claim":"How the many overlapping regulatory inputs (phosphorylation, glycosylation, ubiquitination/SUMO, redox, GPCR signaling, transcriptional and miRNA control) are integrated to set Cav3.2 function in a given cell type, and the structural basis of these modulations, remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of regulated states in the corpus","Quantitative hierarchy among regulators in native tissue undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,2,5,28]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[4,8,25,26,27]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,7,44]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[18]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[22,29,42]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[2,16,17,49]}],"complexes":[],"partners":["WWP1","USP5","CALR","PPP3CA","HCN1","KCNMA1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O95180","full_name":"Voltage-dependent T-type calcium channel subunit alpha-1H","aliases":["Low-voltage-activated calcium channel alpha1 3.2 subunit","Voltage-gated calcium channel subunit alpha Cav3.2"],"length_aa":2353,"mass_kda":259.2,"function":"Voltage-sensitive calcium channel that gives rise to T-type calcium currents. T-type calcium channels belong to the 'low-voltage activated (LVA)' group. A particularity of this type of channel is an opening at quite negative potentials, and a voltage-dependent inactivation (PubMed:27149520, PubMed:9670923, PubMed:9930755). T-type channels serve pacemaking functions in both central neurons and cardiac nodal cells and support calcium signaling in secretory cells and vascular smooth muscle (Probable). They may also be involved in the modulation of firing patterns of neurons (PubMed:15048902). In the adrenal zona glomerulosa, participates in the signaling pathway leading to aldosterone production in response to either AGT/angiotensin II, or hyperkalemia (PubMed:25907736, PubMed:27729216)","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/O95180/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CACNA1H","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CACNA1H","total_profiled":1310},"omim":[{"mim_id":"619521","title":"EPILEPSY, IDIOPATHIC GENERALIZED, SUSCEPTIBILITY TO, 18; EIG18","url":"https://www.omim.org/entry/619521"},{"mim_id":"617027","title":"HYPERALDOSTERONISM, FAMILIAL, TYPE IV; HALD4","url":"https://www.omim.org/entry/617027"},{"mim_id":"616440","title":"SOLUTE CARRIER FAMILY 32 (GABA VESICULAR TRANSPORTER), MEMBER 1; SLC32A1","url":"https://www.omim.org/entry/616440"},{"mim_id":"611942","title":"EPILEPSY, CHILDHOOD ABSENCE, SUSCEPTIBILITY TO, 6; ECA6","url":"https://www.omim.org/entry/611942"},{"mim_id":"608230","title":"CALCIUM CHANNEL, VOLTAGE-DEPENDENT, T TYPE, ALPHA-1I SUBUNIT; CACNA1I","url":"https://www.omim.org/entry/608230"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Vesicles","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"intestine","ntpm":103.4}],"url":"https://www.proteinatlas.org/search/CACNA1H"},"hgnc":{"alias_symbol":["Cav3.2"],"prev_symbol":[]},"alphafold":{"accession":"O95180","domains":[{"cath_id":"1.20.120.350","chopping":"79-212","consensus_level":"high","plddt":83.1275,"start":79,"end":212},{"cath_id":"1.10.287.70","chopping":"214-255_365-439","consensus_level":"medium","plddt":81.9058,"start":214,"end":439},{"cath_id":"-","chopping":"257-323_336-353","consensus_level":"medium","plddt":81.2714,"start":257,"end":353},{"cath_id":"1.20.120.350","chopping":"1274-1413","consensus_level":"high","plddt":80.1116,"start":1274,"end":1413},{"cath_id":"1.10.287.70","chopping":"1415-1585","consensus_level":"medium","plddt":81.4531,"start":1415,"end":1585},{"cath_id":"1.20.120.350","chopping":"1600-1730","consensus_level":"high","plddt":83.131,"start":1600,"end":1730},{"cath_id":"1.10.287.70","chopping":"1733-1878","consensus_level":"medium","plddt":77.5836,"start":1733,"end":1878}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95180","model_url":"https://alphafold.ebi.ac.uk/files/AF-O95180-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O95180-F1-predicted_aligned_error_v6.png","plddt_mean":58.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CACNA1H","jax_strain_url":"https://www.jax.org/strain/search?query=CACNA1H"},"sequence":{"accession":"O95180","fasta_url":"https://rest.uniprot.org/uniprotkb/O95180.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95180/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95180"}},"corpus_meta":[{"pmid":"15616581","id":"PMC_15616581","title":"Silencing 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replicated across multiple pain paradigms in a single rigorous study\",\n      \"pmids\": [\"15616581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cav3.2 T-type channels are ubiquitinated by the plasma-membrane-associated E3 ubiquitin ligase WWP1, which binds the intracellular domain III-IV linker region of Cav3.2 and modifies specific lysine residues there; the deubiquitinating enzyme USP5 also binds the III-IV linker (identified by proteomic screen), counteracts WWP1-mediated ubiquitination, stabilizes Cav3.2 protein levels, and maintains Cav3.2 whole-cell currents and nociceptive signaling.\",\n      \"method\": \"Proteomic screen, Co-IP, shRNA knockdown, whole-cell patch clamp, in vivo Tat peptide delivery with behavioral assays\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, proteomic identification, multiple orthogonal methods (shRNA, peptide uncoupling, electrophysiology, behavior) in one study\",\n      \"pmids\": [\"25189210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The gain-of-function CACNA1H M1549V mutation drastically impairs Cav3.2 channel inactivation and shifts activation to more hyperpolarized potentials, increasing intracellular Ca2+ and driving autonomous aldosterone production, causing early-onset hypertension with primary aldosteronism.\",\n      \"method\": \"Exome sequencing, whole-cell patch clamp of mutant channels expressed in HEK cells, electrophysiological characterization\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — functional electrophysiological characterization of mutant channels with multiple biophysical parameters measured; mutation independently identified in five families and confirmed as de novo in two\",\n      \"pmids\": [\"25907736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Transient selective upregulation of Cav3.2 mRNA and protein after status epilepticus increases T-type Ca2+ currents and burst firing; Cav3.2-null mice lack these changes and show dramatically reduced spontaneous seizures, neuron loss, and mossy fiber sprouting, establishing Cav3.2 transcriptional upregulation as a critical step in epileptogenesis.\",\n      \"method\": \"Cav3.2 knockout mice, qPCR, western blot, whole-cell patch clamp, in vivo EEG seizure monitoring, histopathology\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with multiple orthogonal readouts (molecular, electrophysiological, behavioral, histological) in a single rigorous study\",\n      \"pmids\": [\"19052226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Cav3.2 channels are the primary molecular substrate for redox regulation of T-type Ca2+ currents in thalamic neurons: reducing agents selectively enhance Cav3.2 (but not Cav3.1 or Cav3.3) currents, and this enhancement is absent in Cav3.2-null mice.\",\n      \"method\": \"Patch clamp electrophysiology in native thalamic neurons and recombinant channels, Cav3.2 knockout mice\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — native neuron recordings confirmed with knockout mice and recombinant channel comparisons across all three Cav3 isoforms\",\n      \"pmids\": [\"16644797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Childhood absence epilepsy-associated missense mutations F161L and E282K in Cav3.2 shift the half-activation potential ~10 mV hyperpolarized (allowing channel opening near resting potential); V831M slows inactivation ~50% and shifts half-inactivation ~10 mV depolarized—all increasing calcium influx during physiological activation.\",\n      \"method\": \"Site-directed mutagenesis of rat Cav3.2, whole-cell patch clamp in transfected HEK293 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro electrophysiology with mutagenesis; multiple mutations characterized with rigorous biophysical analysis in a single study\",\n      \"pmids\": [\"14729682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Eleven of twelve CAE-associated Cav3.2 SNPs alter channel gating properties when introduced into recombinant channels; computer modeling predicts that seven increase neuronal firing (three inducing oscillations at absence-seizure frequencies) and three decrease firing, establishing these as susceptibility variants that alter channel function.\",\n      \"method\": \"Site-directed mutagenesis, whole-cell patch clamp in transfected cells, computational neuronal modeling\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — systematic mutagenesis of all 12 variants with electrophysiology plus computational modeling; large-scale functional study\",\n      \"pmids\": [\"15888660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"N-linked glycosylation at asparagine N192 of Cav3.2 is critical for surface expression of the channel, whereas glycosylation at N1466 controls channel activity; N-glycosylation also underlies glucose-dependent potentiation of T-type current.\",\n      \"method\": \"Site-directed mutagenesis of N-glycosylation sites, surface biotinylation, whole-cell patch clamp in recombinant expression system\",\n      \"journal\": \"Pflugers Archiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — systematic mutagenesis with multiple orthogonal readouts (surface expression and electrophysiology) in a single rigorous study\",\n      \"pmids\": [\"23503728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The high-affinity extracellular zinc/metal binding site on Cav3.2 is formed by a His-Gly-Asp motif in IS3-S4 (with H191 as critical histidine) together with an aspartate in IS2; this site stabilizes the closed conformation of the voltage-sensor paddle in repeat I to inhibit channel opening.\",\n      \"method\": \"Chimeric channel construction, site-directed mutagenesis, whole-cell patch clamp electrophysiology with zinc/metal block assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis and chimeric channels with functional assays systematically identify binding site residues\",\n      \"pmids\": [\"19940152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In vivo phosphorylation mapping of Cav3.2 immunopurified from rat brain identified 34 phosphorylation sites; phosphorylation directly regulates channel gating including voltage-dependent activation, inactivation, and kinetics. A cluster at S442/S445/T446 in the loop I-II is crucial for this regulation, shown by alkaline phosphatase treatment and dephosphomimetic mutants.\",\n      \"method\": \"Immunopurification from rat brain, high-resolution mass spectrometry phosphoproteomics, site-directed mutagenesis, patch clamp electrophysiology\",\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 phosphorylation map by MS confirmed with mutagenesis and electrophysiology; multiple orthogonal methods\",\n      \"pmids\": [\"26483470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PKA augments Cav3.2 channel activity (~40%) and negatively shifts steady-state inactivation; the PKA-mediated augmentation is localized to the II-III intracellular loop of Cav3.2, identified using chimeric channels with Nav1.4 segments.\",\n      \"method\": \"Xenopus oocyte expression, whole-cell patch clamp, pharmacological PKA activation/inhibition, chimeric channel construction\",\n      \"journal\": \"The Journal of pharmacology and experimental therapeutics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — chimeric channel domain mapping combined with pharmacological dissection and electrophysiology\",\n      \"pmids\": [\"16569752\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Gβγ dimers inhibit Cav3.2 channels in a voltage-independent manner that requires prior PKA phosphorylation of Ser1107 on the II-III loop; S1107A mutation prevents Gβγ inhibition without disrupting dimer binding. Dopamine inhibits Cav3.2 via synergistic D1/D2 receptor activation requiring both PKA and Gβγ.\",\n      \"method\": \"Site-directed mutagenesis (S1107A), single-channel and whole-cell patch clamp, recombinant Gβγ application, pharmacological dopamine receptor manipulation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis identifying critical serine plus mechanistic dissection with multiple pharmacological tools and electrophysiology\",\n      \"pmids\": [\"19131331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CRFR1 activation by CRF or urocortin 1 selectively inhibits Cav3.2 (but not Cav3.1 or Cav3.3) currents via a cholera toxin-sensitive Gβγ-dependent mechanism; inhibition is independent of PLC, tyrosine kinases, CaMKII, or PKC, and manifests as a hyperpolarizing shift in steady-state inactivation.\",\n      \"method\": \"Whole-cell patch clamp, pharmacological dissection with pathway inhibitors, selective receptor antagonist (astressin), co-expression of CRFR1 with Cav3 isoforms\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic pharmacological dissection of signaling pathway with electrophysiology; isoform selectivity established by parallel comparison\",\n      \"pmids\": [\"18292205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NK1 receptor inhibits Cav3.2 channels through a voltage-independent Gαq/11-PLC-PKC signaling pathway; dominant-negative Gαq, RGS2/3T, U73122 (PLC inhibitor), and bisindolylmaleimide I (PKC inhibitor) each block the inhibition, whereas Gαt (Gβγ scavenger) does not.\",\n      \"method\": \"Co-expression in HEK293 cells, whole-cell patch clamp, dominant-negative constructs, pharmacological inhibitors of PLC and PKC\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic pathway dissection using dominant-negative proteins and selective pharmacological inhibitors with electrophysiology\",\n      \"pmids\": [\"19805509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cav3.2 is required for tracheal chondrogenesis: Cav3.2-null mice have congenital tracheal stenosis due to incomplete cartilage formation. Ca2+ influx via Cav3.2 activates calcineurin/NFAT signaling, and NFAT binds a newly identified site in the Sox9 promoter to drive Sox9 expression during chondrogenesis.\",\n      \"method\": \"Cav3.2 knockout mice, Cav3.2 overexpression in ATDC5 cells, calcineurin/NFAT inhibitors, luciferase reporter assay, gel shift (EMSA), ChIP\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout phenotype confirmed mechanistically by overexpression, pharmacological inhibition, and transcriptional assays (EMSA + ChIP + luciferase)\",\n      \"pmids\": [\"24778262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The transcription factor Egr1 activates the Cav3.2 (Cacna1h) promoter by binding to multiple Egr1 sites identified therein; REST (NRSF) counteracts Egr1 and represses Cav3.2 promoter activity and mRNA. Egr1 overexpression in vitro and in vivo increases Cav3.2 mRNA and T-type current.\",\n      \"method\": \"Promoter analysis, dual-luciferase reporter assay, chromatin immunoprecipitation (ChIP) in NG108-15 cells and mouse hippocampi, whole-cell patch clamp\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP in both cell line and in vivo tissue, promoter reporter assays, and electrophysiological confirmation; multiple orthogonal methods\",\n      \"pmids\": [\"22431737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Electrophysiological analysis of four novel CACNA1H variants associated with different forms of primary aldosteronism (p.Met1549Ile, p.Ser196Leu, p.Pro2083Leu, p.Val1951Glu) all show significant gain-of-function changes in Ca2+ current properties; transfection of mutant Cav3.2 in H295R-S2 cells increases aldosterone production and expression of steroidogenic enzymes after K+ stimulation.\",\n      \"method\": \"Whole-cell patch clamp of mutant channels in HEK cells, aldosterone production assay (ELISA), gene expression in adrenocortical cells\",\n      \"journal\": \"EBioMedicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional electrophysiology plus cellular aldosterone production assay; four independent variants all showing same direction of effect\",\n      \"pmids\": [\"27729216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CACNA1H M1549V expressed in HAC15 adrenocortical cells increases aldosterone production 7-fold and CYP11B2 expression; the T-type channel blocker mibefradil completely abrogates both effects, directly linking gain-of-function Cav3.2 activity to autonomous aldosterone production.\",\n      \"method\": \"Heterologous expression in HAC15 cells, aldosterone ELISA, real-time PCR for CYP11B2, pharmacological inhibition with mibefradil\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell transfection with quantitative aldosterone and gene expression endpoints plus pharmacological rescue with selective blocker\",\n      \"pmids\": [\"27258646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Calnexin, an ER integral membrane protein, interacts with the III-IV linker region of Cav3.2 to modulate channel sorting to the cell surface; the GAERS missense mutation R1584P in the III-IV linker disrupts the Cav3.2/calnexin interaction, resulting in increased Cav3.2 surface expression and elevated calcium influx.\",\n      \"method\": \"Co-immunoprecipitation, surface biotinylation, whole-cell patch clamp, recombinant channel expression\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating physical interaction, surface expression quantification, and electrophysiological confirmation; mechanistic linkage between calnexin interaction and trafficking established\",\n      \"pmids\": [\"28912545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Egr1 binds directly to the Cav3.2 promoter region 41-81 bp upstream of the TSS following transverse aortic banding (pressure overload); Egr1 knockdown prevents phenylephrine-induced Cav3.2 upregulation and cardiac hypertrophy, while Cav3.2 overexpression rescues the hypertrophic response in Egr1-knockdown cells.\",\n      \"method\": \"ChIP, EMSA, in vivo cardiac gene transfer with reporter constructs, siRNA knockdown, neonatal rat ventricular myocyte hypertrophy assay\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo ChIP and EMSA identify binding site; genetic knockdown and rescue experiment confirm functional role; multiple orthogonal methods\",\n      \"pmids\": [\"23929524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Calcineurin physically interacts with Cav3.2; Ca2+ and calmodulin modulate this interaction. Calcineurin binding to Cav3.2 decreases calcineurin phosphatase activity and reduces Cav3.2 current density. A cell-permeable peptide mimicking the calcineurin-binding site of Cav3.2 reduces phenylephrine-induced cardiac hypertrophy.\",\n      \"method\": \"Co-immunoprecipitation, patch clamp electrophysiology, calcineurin phosphatase activity assay, cell-permeable peptide in neonatal cardiac myocytes\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, functional enzyme assay, electrophysiology, and peptide inhibition provide multiple orthogonal lines of evidence\",\n      \"pmids\": [\"23669360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cav3.2 is selectively expressed in Aδ- and C-low-threshold mechanoreceptors (LTMRs) innervating hair follicles; C-LTMR-specific Cav3.2 knockout reveals that Cav3.2 regulates light-touch perception, noxious mechanical/cold/chemical sensations, and is essential for allodynic symptoms of neuropathic pain.\",\n      \"method\": \"Knockin/flox mouse expressing Cav3.2-GFP fusion, C-LTMR-specific conditional knockout, behavioral sensory testing, confocal imaging of fiber trajectories\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout with cell-type-specific resolution and multiple behavioral modalities; knockin GFP fusion for localization\",\n      \"pmids\": [\"25600872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CaV3.2 channels preferentially incorporate into synapses and control NMDA receptor-mediated transmission in an activity-dependent manner by local calcium influx. Expression of the CAE-linked hCaV3.2(C456S) mutant (higher open probability) enhances glutamatergic transmission and induces 2-4 Hz spike-wave discharges (absence-like epilepsy) in rats when expressed in cortex.\",\n      \"method\": \"Electrophysiological recordings at rat central synapses, in vivo cortical expression of mutant channels, EEG recordings, AMPA-R and NMDA-R antagonists\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — synaptic electrophysiology, in vivo expression, EEG, and pharmacological rescue with receptor antagonists in a single study\",\n      \"pmids\": [\"26220996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The GAERS Cacna1h R1584P (gcm) missense mutation requires the presence of exon 25 to produce gain-of-function effects (faster recovery from inactivation, greater charge transference during high-frequency bursts); without exon 25, the mutation has no significant functional effect, demonstrating splice-variant-dependent epistasis.\",\n      \"method\": \"Site-directed mutagenesis of splice variants (with/without exon 25), whole-cell patch clamp in transfected cells, genetic segregation analysis in GAERS×Brown Norway F2 cross\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis in defined splice backgrounds with electrophysiology; segregation analysis showing codominant segregation with seizure severity\",\n      \"pmids\": [\"19144837\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"C456S Cav3.2 epilepsy mutant channels increase neuronal excitability by raising spontaneous firing and lowering burst-firing threshold; the I-II loop region increases channel surface expression without altering dendritic distribution; C456S also promotes dendritic growth via Ca2+-regulated transcriptional changes, all reversed by ethosuximide or TTA-P2.\",\n      \"method\": \"Recombinant channel expression in cultured neurons, whole-cell patch clamp, immunocytochemistry, dendritic morphometry, transactivator trap (CaRE) assay, pharmacological reversal\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (electrophysiology, surface expression, morphology, transcriptional assay, pharmacological rescue) in a single study\",\n      \"pmids\": [\"24277868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Nitrous oxide selectively inhibits Cav3.2 T-type channels via a free radical mechanism: H191 on the extracellular face of Cav3.2 participates in a metal-binding site that generates reactive oxygen species in the presence of N2O, causing localized oxidation of H191. Cav3.2-null mice show reduced N2O analgesia in formalin-induced pain.\",\n      \"method\": \"Site-directed mutagenesis (H191), metal chelators, catalase and SOD/catalase mimetics, patch clamp, Cav3.2 knockout mouse behavioral assays\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — mutagenesis identifies critical residue; chemical probes establish ROS intermediates; knockout mice confirm in vivo relevance\",\n      \"pmids\": [\"21059758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"H2S selectively inhibits Cav3.2 (not Cav3.1 or Cav3.3) via the extracellular residue H191; chelation of Zn2+ prevents and reverses H2S inhibition, suggesting H2S increases the affinity of the channel for extracellular Zn2+ binding at the H191 site.\",\n      \"method\": \"Whole-cell patch clamp of heterologously expressed Cav3 isoforms in HEK293 cells, Zn2+ chelator (TPEN), native DRG neuron recordings, H191 mutant analysis\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — isoform selectivity established by parallel comparison; H191 residue requirement determined; Zn2+ chelation rescue mechanistically informative; multiple cell systems tested\",\n      \"pmids\": [\"25183670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Carbon monoxide (CO, derived from HO-1) inhibits Cav3.2 T-type channels via an extracellular redox-sensitive site; thioredoxin (Trx) tonically maintains Cav3.2 channel activity at this site. Trx depletion reduces Cav3.2 currents and diminishes CO sensitivity. Cav3.1 and Cav3.3 are unaffected.\",\n      \"method\": \"Patch clamp in HEK293 cells expressing Cav3.1-3.3, CORM-2 application, auranofin (Trx depletion), native NG108-15 and DRG neuron recordings\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform selectivity confirmed across all three Cav3 subtypes; Trx modulation established pharmacologically in multiple cell systems\",\n      \"pmids\": [\"23671274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CaV3.2 channels in resistance arteries restrain myogenic constriction through a CaV3.2→ryanodine receptor→BKCa negative feedback axis: genetic deletion of CaV3.2 enhances myogenic tone, reduces spontaneous transient outward K+ currents (BKCa activity), and abolishes Ca2+ sparks normally evoked by CaV3.2 activity.\",\n      \"method\": \"CaV3.2 knockout mice, pressurized vessel myography, patch clamp electrophysiology (BKCa STOCs), Fluo-4 Ca2+ spark imaging in en face arteries\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout confirmed pharmacologically (Ni2+ specificity absent in KO); multiple orthogonal readouts (myography, electrophysiology, Ca2+ imaging)\",\n      \"pmids\": [\"26069238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Presynaptic HCN1 channels colocalize with Cav3.2 at active zones of axon terminals onto entorhinal cortical layer III pyramidal neurons; HCN channels suppress glutamate release by inhibiting presynaptic Cav3.2 T-type Ca2+ channel activity.\",\n      \"method\": \"Electron microscopy (immunogold colocalization), electrophysiology, pharmacological dissection, HCN1 knockout mice\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ultrastructural colocalization by EM plus functional electrophysiology and genetic knockout converge on same mechanism\",\n      \"pmids\": [\"21358644\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MTF1 directly activates Cacna1h transcription in COCH neurons of ventral CA3 hippocampus; this MTF1-Cacna1h axis enables burst firing in COCH neurons and drives social-stress-induced anxiety-like behaviors via synapses onto GABAergic neurons in the lateral septum.\",\n      \"method\": \"Genetic targeting of COCH neurons, ChIP/transcriptional assays for MTF1-Cacna1h, optogenetics, electrophysiology, behavioral tests\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — circuit and transcriptional evidence in a single study; MTF1-Cacna1h interaction established but abstract is concise about mechanistic details\",\n      \"pmids\": [\"34965426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SUMOylation of USP5 at lysine K113 (via SUMO2/3) reduces USP5 affinity for Cav3.2; peripheral nerve injury decreases USP5 SUMOylation in DRG, thereby increasing USP5-Cav3.2 binding and Cav3.2 channel activity.\",\n      \"method\": \"Co-immunoprecipitation of Cav3.2 with USP5 mutants (K113R), site-directed mutagenesis, expression in tsA-201 cells, immunoblot of endogenous DRG proteins\",\n      \"journal\": \"Molecular brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP and mutagenesis identify K113 as SUMO site; functional consequence on channel activity inferred indirectly; single lab\",\n      \"pmids\": [\"31455361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Interleukin-1β administration increases USP5-Cav3.2 interaction in spinal dorsal horn (by Co-IP); disruption of this interaction with Tat peptides suppresses IL-1β-induced nocifensive responses, identifying IL-1β as an upstream trigger for USP5-Cav3.2 upregulation in the pain pathway.\",\n      \"method\": \"Co-immunoprecipitation from spinal tissue, intrathecal IL-1β administration, Tat peptide delivery, DRG neuron cultures, behavioral assays\",\n      \"journal\": \"Molecular pain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP in tissue plus pharmacological peptide intervention with behavioral endpoints; single lab\",\n      \"pmids\": [\"28741432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"In rat chromaffin cells, chronic cAMP exposure recruits Cav3.2 (α1H) T-type channels via an Epac-mediated pathway; the newly recruited T-type channels support 'low-threshold exocytosis' evoked at potentials as low as −50 mV, an effect blocked by 50 µM Ni2+ (selective T-type blocker at this concentration).\",\n      \"method\": \"RT-PCR (isoform identification), capacitance measurements of exocytosis, Ni2+ pharmacology, patch clamp, chronic cAMP treatment of rat chromaffin cells\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Cav3.2 isoform identified by RT-PCR; exocytosis-channel link established pharmacologically with Ni2+ selectivity; single lab\",\n      \"pmids\": [\"16361341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"BK channels and Cav3.2 form macromolecular complexes in LNCaP prostate cancer cells (demonstrated by Co-IP); BK channels set resting membrane potential at ~-40 mV, promoting constitutive Ca2+ entry through Cav3.2, which together drive cell proliferation.\",\n      \"method\": \"Single-channel recording, confocal imaging, co-immunoprecipitation, siRNA knockdown, flow cytometry (cell cycle), cell survival assay\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP demonstrates physical interaction; functional link through siRNA and pharmacology; single lab\",\n      \"pmids\": [\"24143281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ACTH induces Cav3.2 current and CACNA1H mRNA in adrenal zona fasciculata cells by mechanisms only partly dependent on cAMP; cAMP analogs increase CACNA1H mRNA but not Ca2+ current; 8CPT-cAMP metabolites (including 8CPT-adenosine) increase both mRNA and current, revealing a cAMP-independent pathway for Cav3.2 upregulation by ACTH.\",\n      \"method\": \"Northern blot, whole-cell patch clamp in bovine AZF cells, pharmacological cAMP analog panel\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic pharmacological dissection distinguishing cAMP-dependent vs. -independent regulation; single lab with electrophysiology and Northern blot\",\n      \"pmids\": [\"20424171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MCP-1 directly inhibits Cav3.2 channels with nanomolar affinity independently of CCR2 receptor activation; this direct inhibition is sensitive to divalent metal ion chelator DTPA, suggesting metal ions as a cofactor. MCP-1 also inhibits native T-type currents in acutely dissociated DRG neurons.\",\n      \"method\": \"Whole-cell patch clamp of Cav3 isoforms in tsA-201 cells, heat denaturation controls, DTPA chelation, DRG neuron recordings\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — isoform selectivity established; direct channel effect shown; native DRG neurons confirm; but binding site not identified; single lab\",\n      \"pmids\": [\"19864434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Melatonin inhibits Cav3.2 T-type channels in trigeminal ganglion neurons via MT2 receptor → Gαo (pertussis toxin-sensitive) → Gβγ → novel PKCη signaling; PKCη antagonism or knockdown prevents melatonin effects; MT2 activation selectively inhibits Cav3.2 but not Cav3.1 or Cav3.3 in heterologous expression.\",\n      \"method\": \"Patch clamp in TG neurons and heterologous expression, co-IP of MT2/Gαo, QEHA peptide, shRNA knockdown of Gαo and PKCη, behavioral inflammatory pain model\",\n      \"journal\": \"Journal of pineal research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic pathway dissection with multiple inhibitors, co-IP, and isoform selectivity confirmed in heterologous system; single lab\",\n      \"pmids\": [\"29437250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Neuromedin B receptor (NmbR) selectively potentiates Cav3.2 (not Cav3.1 or Cav3.3) currents in trigeminal ganglion neurons via Gq-coupled Gβγ → AMPK → PKA signaling cascade; AMPK inhibition prevents Nmb-induced increase in PKA activity; Cav3.2 siRNA knockdown abolishes NmbR-driven pain hypersensitivity in vivo.\",\n      \"method\": \"Patch clamp in TG neurons and heterologous system, QEHA peptide, shRNA of Gβ, AMPK/PKA inhibitors, phospho-AMPK western blot, behavioral inflammatory pain model with Cav3.2 siRNA\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multi-step signaling pathway dissected with multiple inhibitors; isoform selectivity confirmed; in vivo siRNA validates Cav3.2 requirement; single lab\",\n      \"pmids\": [\"34646374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CaV3.2 channel opening during ischemia (OGD) contributes Ca2+ that is transmitted to mitochondria, causing deleterious mitochondrial Ca2+ overload; Cav3.2 overexpression worsens ischemic toxicity and mitochondrial Ca2+ loading, while Ni2+ block and Cav3.1/Cav3.2 siRNA are protective.\",\n      \"method\": \"Ca2+ imaging (cytosolic and mitochondrial) in PC12 cells, Cav3.2 overexpression and siRNA knockdown, Ni2+ pharmacology, ATP measurement, cell death assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — overexpression and knockdown with multiple readouts; mitochondrial uniporter manipulation confirms Ca2+ routing; single lab\",\n      \"pmids\": [\"23508951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Cav3.2 T-type Ca2+ current is the molecular determinant of GABA-induced excitability in a subset of adult sensory neurons: Cav3.2-null mice lack T-type current and show no GABAA receptor-induced action potential firing or intracellular Ca2+ increase in this neuron subset.\",\n      \"method\": \"Cav3.2 knockout mice, patch clamp, intracellular Ca2+ imaging, GABAA receptor pharmacology\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with electrophysiology and Ca2+ imaging confirms Cav3.2 as the required molecular substrate; single lab\",\n      \"pmids\": [\"17716912\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CaV3.2 channels in carotid body glomus cells mediate the H2S-dependent hypoxic Ca2+ response: CaV3.2 knockout mice show markedly attenuated hypoxia-evoked intracellular Ca2+ increases, catecholamine secretion, and sensory nerve excitation; NaHS (H2S donor) effects are also markedly reduced in Cacna1h-/- mice.\",\n      \"method\": \"Cav3.2 knockout mice, intracellular Ca2+ imaging in glomus cells, catecholamine secretion assay, carotid body sensory nerve recording, pharmacological T-type blockers\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout plus pharmacological blockers with multiple physiological readouts; single lab\",\n      \"pmids\": [\"25377087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cav3.2 channels at the axon initial segment of mature dentate granule cells are responsible for burst firing: Cav3.2 knockout mice fire tonic spikes instead of bursts, exhibit impaired synaptic plasticity, and show reduced dentate-to-CA3 communication.\",\n      \"method\": \"Cav3.2 knockout mice, patch clamp electrophysiology in granule cells, synaptic plasticity recordings, axon initial segment localization\",\n      \"journal\": \"Cerebral cortex\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with electrophysiological and synaptic readouts; localization to axon initial segment; single lab\",\n      \"pmids\": [\"29790938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Cav3.2 is the predominant T-type Ca2+ channel subtype expressed in embryonic mouse heart (E9.5 and E18), as determined by quantitative PCR; Cav3.2 mRNA predominates over Cav3.1 during embryonic period, then switches to Cav3.1 predominance in adulthood; T-type currents in embryonic ventricular myocytes are sensitive to low Ni2+ concentrations (IC50 26-31 µM), consistent with Cav3.2.\",\n      \"method\": \"Quantitative PCR, whole-cell patch clamp with Ni2+ pharmacology in acutely isolated mouse ventricular myocytes at developmental stages\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — qPCR plus electrophysiology with pharmacological Ni2+ selectivity; Cav3.2 and Cav3.1 directly compared; single lab\",\n      \"pmids\": [\"14988077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Immunoelectron microscopy demonstrates that Cav3.2 protein is expressed in soma and peripheral axons of small-diameter (nociceptive, IB4+, CGRP+) DRG neurons and in unmyelinated sciatic nerve fibers, as well as in peripheral nerve endings of hind-paw skin.\",\n      \"method\": \"Polyclonal Cav3.2 antibody, confocal immunofluorescence, electron microscopy with immunogold labeling, co-localization with nociceptor markers\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunogold EM provides subcellular resolution; new isoform-selective antibody used; single lab\",\n      \"pmids\": [\"23867767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"S-nitrosothiols (SNOs such as GSNO) inhibit CaV3.2 T-type channels in DRG neurons by acting on putative extracellular cysteine thiol residues in repeats I and II; a quadruple Cys-Ala mutant at these sites abolishes GSNO inhibition without affecting voltage dependence.\",\n      \"method\": \"Site-directed mutagenesis (quadruple Cys-Ala in repeats I/II), patch clamp in DRG neurons and HEK cells, N-ethylmaleimide pretreatment, guanylyl cyclase inhibitor controls\",\n      \"journal\": \"Molecular neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis identifies specific Cys residues in native-channel context; mechanism confirmed pharmacologically; single lab\",\n      \"pmids\": [\"23813099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"H2S (NaHS) activates or sensitizes Cav3.2 T-type channels expressed in primary afferents and spinal nociceptive neurons, causing hyperalgesia; antisense knockdown of Cav3.2 protein in DRG and spinal cord attenuates both intrathecal and intraplantar NaHS-induced hyperalgesia, while zinc chloride (preferential Cav3.2 blocker) and mibefradil reproduce this effect.\",\n      \"method\": \"Antisense oligodeoxynucleotide knockdown, Western blot for Cav3.2 protein, paw pressure nociceptive threshold, pharmacological (zinc chloride, mibefradil)\",\n      \"journal\": \"Pain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — antisense knockdown with protein confirmation and behavioral readout; pharmacological validation with multiple agents; single lab\",\n      \"pmids\": [\"19167819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"miR-32-5p directly targets Cav3.2 mRNA in trigeminal ganglion neurons; nerve injury causes histone methylation (H3K9me2, H3K27me3) at the miR-32-5p promoter, suppressing miR-32-5p and de-repressing Cav3.2 protein and T-type currents to drive trigeminal neuropathic pain.\",\n      \"method\": \"High-throughput miRNA sequencing, qPCR, histone methyltransferase inhibitors, lentiviral miR-32-5p overexpression, Western blot, patch clamp, behavioral pain assays\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct targeting established with overexpression and electrophysiology; chromatin mechanism supported by inhibitor data; single lab\",\n      \"pmids\": [\"35353623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"A somatic CACNA1H I1430T mutation in aldosterone-producing adenoma, when expressed in HAC15 cells via inducible system, increases CYP11B2 mRNA and aldosterone production, supporting its role as a driver of autonomous aldosterone secretion.\",\n      \"method\": \"CYP11B2-guided exome sequencing, doxycycline-inducible CACNA1H I1430T expression in HAC15 cells, CYP11B2 qPCR, aldosterone ELISA\",\n      \"journal\": \"Hypertension\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — inducible expression system with quantitative functional readouts in relevant adrenocortical cell line; single lab\",\n      \"pmids\": [\"31983310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cacna1h knockin (M1549V) mice have increased aldosterone:renin ratios, elevated adrenal Cyp11b2 expression (not suppressed by high salt), and 8 mmHg higher systolic blood pressure than wild-type; adrenal glomerulosa cells from knockin mice show increased baseline and peak intracellular Ca2+ concentrations, establishing elevated intracellular Ca2+ as the mechanistic link between gain-of-function Cav3.2 and aldosterone overproduction.\",\n      \"method\": \"CRISPR/Cas9 knockin and knockout mice, blood pressure telemetry, aldosterone/renin assay, adrenal slice Ca2+ imaging (zona glomerulosa), qPCR\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockin and knockout with multiple physiological endpoints plus direct Ca2+ imaging in the relevant tissue; mechanistic chain from channel mutation to Ca2+ to aldosterone established\",\n      \"pmids\": [\"33879608\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Cav3.2 (CACNA1H) is a low-voltage-activated T-type calcium channel whose gating is regulated by PKA phosphorylation (II-III loop, S1107), Gβγ dimers, redox agents (via extracellular H191), N-linked glycosylation (N192 for surface expression, N1466 for activity), calcineurin binding, and multiple GPCRs (CRFR1, NK1R, MT2R, NmbR); it is ubiquitinated by WWP1 at the III-IV linker and stabilized by USP5 (regulated by SUMOylation at K113), controlling its plasma membrane levels and nociceptive signaling; in the pain pathway Cav3.2 is the primary T-type isoform in nociceptive DRG neurons and spinal dorsal horn, where upregulation drives inflammatory and neuropathic pain; in the brain it supports burst firing and thalamocortical oscillations; its gain-of-function increases NMDA receptor-mediated transmission and can cause absence epilepsy; in the adrenal gland it mediates Ca2+ influx that drives aldosterone production via calcineurin/NFAT signaling, and gain-of-function mutations cause primary aldosteronism; it is also essential for tracheal chondrogenesis (via calcineurin/NFAT/Sox9), cardiac automaticity (upregulated by Egr1/REST transcriptional regulation), and arterial myogenic tone (via a CaV3.2→ryanodine receptor→BKCa negative feedback axis).\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CACNA1H encodes Cav3.2, a low-voltage-activated T-type calcium channel that converts membrane depolarization near resting potential into Ca2+ influx, supporting burst firing, nociceptive signaling, and Ca2+-driven gene programs across neurons, adrenal cortex, cartilage, heart, and vasculature [#0, #3, #14]. Its biophysical gating is tuned by a dense regulatory layer: in vivo phosphorylation at 34 sites (including a I-II loop cluster S442/S445/T446) shapes activation and inactivation [#9], PKA augments current via the II-III loop and licenses voltage-independent Gβγ inhibition through Ser1107 [#10, #11], and an extracellular metal-binding site organized around His191 in IS3-S4 mediates selective redox modulation by zinc, nitrous oxide, H2S, and CO that distinguishes Cav3.2 from Cav3.1/Cav3.3 [#8, #25, #26, #27]. Channel surface density is set by competing trafficking and stability machinery: N-glycosylation at N192 governs surface expression and N1466 governs activity [#7], calnexin binding at the III-IV linker controls ER sorting [#18], and the same linker is ubiquitinated by WWP1 and deubiquitinated/stabilized by USP5, a balance that controls plasma-membrane levels and pain signaling [#1]. In nociceptive Aδ/C-fiber DRG and trigeminal neurons, Cav3.2 is the dominant T-type isoform and its upregulation drives inflammatory and neuropathic pain, with knockdown producing analgesia [#0, #21, #44]; multiple GPCRs and inflammatory mediators converge on the channel to modulate this output [#12, #13, #37, #38]. Gain-of-function gating changes are pathogenic in two settings: mutations that hyperpolarize activation or slow inactivation (e.g., F161L, E282K, M1549V, C456S) increase neuronal Ca2+ influx and NMDA receptor-mediated transmission to cause absence epilepsy [#5, #6, #22], while gain-of-function mutations such as M1549V raise glomerulosa intracellular Ca2+ to drive CYP11B2-dependent aldosterone production, causing primary aldosteronism [#2, #16, #49]. Beyond these, Cav3.2-derived Ca2+ activates calcineurin/NFAT/Sox9 signaling required for tracheal chondrogenesis [#14] and feeds a CaV3.2→ryanodine receptor→BKCa negative-feedback axis restraining arterial myogenic tone [#28].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established that Cav3.2 itself, not merely a generic T-type current, drives nociception, providing the founding gene-function link for the pain field.\",\n      \"evidence\": \"Intrathecal antisense knockdown in rat DRG with electrophysiology and behavioral pain assays\",\n      \"pmids\": [\"15616581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not resolve subcellular site of action\", \"Antisense specificity vs other Cav3 isoforms not fully excluded\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined how human absence-epilepsy mutations alter channel biophysics, linking specific gating shifts to pathogenic Ca2+ influx near rest.\",\n      \"evidence\": \"Site-directed mutagenesis (F161L, E282K, V831M) and whole-cell patch clamp in HEK293\",\n      \"pmids\": [\"14729682\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vitro only; no in vivo seizure correlation\", \"Splice-variant context not tested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Systematically scaled the genotype-to-gating analysis, showing most CAE variants alter gating and predicting their net effect on firing, establishing them as functional susceptibility alleles.\",\n      \"evidence\": \"Mutagenesis of 12 variants, patch clamp, and computational neuronal modeling\",\n      \"pmids\": [\"15888660\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Firing predictions are computational\", \"No animal validation in this study\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified Cav3.2 as the selective molecular substrate for redox modulation of T-type current and mapped PKA augmentation to the II-III loop, opening the channel's regulatory-domain architecture.\",\n      \"evidence\": \"Native thalamic neuron and recombinant recordings with Cav3.2-null mice; chimeric Nav1.4/Cav3.2 channels in oocytes\",\n      \"pmids\": [\"16644797\", \"16569752\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Redox sensor residue not yet identified in 2006\", \"PKA target residue not yet mapped\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Resolved the molecular logic of GPCR and Gβγ regulation, showing PKA phosphorylation of Ser1107 is a prerequisite for voltage-independent Gβγ inhibition, and identified the His191 metal-binding pocket controlling gating.\",\n      \"evidence\": \"S1107A mutagenesis with single-channel recording; chimera/mutagenesis zinc-block assays\",\n      \"pmids\": [\"19131331\", \"19940152\", \"18292205\", \"19805509\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of Gβγ binding vs phosphorylation not quantified\", \"Physiological GPCR coupling in native nociceptors inferred from heterologous systems\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated that transcriptional upregulation of Cav3.2 is a causal step in epileptogenesis, moving the channel from biophysical correlate to driver of network pathology.\",\n      \"evidence\": \"Cav3.2-null mice with qPCR, patch clamp, EEG, and histopathology after status epilepticus\",\n      \"pmids\": [\"19052226\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream transcriptional trigger not identified in this study\", \"Cell types responsible not dissected\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Mechanistically explained gasotransmitter and anesthetic modulation by showing His191 forms a metal/ROS-sensitive site, unifying N2O, H2S, CO, and S-nitrosothiol regulation of Cav3.2.\",\n      \"evidence\": \"H191 and cysteine mutagenesis, ROS scavengers, Zn2+ chelation, native DRG recordings, Cav3.2-null behavior\",\n      \"pmids\": [\"21059758\", \"25183670\", \"23671274\", \"23813099\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous redox tone regulating the site in vivo not fully quantified\", \"Whether thioredoxin acts directly on H191 unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified the transcriptional control of Cacna1h by an Egr1 (activator)/REST (repressor) module, providing the gene-regulatory layer governing channel abundance.\",\n      \"evidence\": \"Promoter reporter assays, ChIP in cells and mouse hippocampus, electrophysiology\",\n      \"pmids\": [\"22431737\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific deployment of this module not mapped\", \"Signals upstream of Egr1/REST not defined here\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Extended the regulatory network to cardiac hypertrophy and Ca2+/calmodulin signaling, showing Egr1-driven Cav3.2 upregulation under pressure overload and a reciprocal Cav3.2-calcineurin physical interaction.\",\n      \"evidence\": \"ChIP/EMSA, in vivo cardiac gene transfer, siRNA/rescue; Co-IP and calcineurin phosphatase activity assays with peptide inhibition\",\n      \"pmids\": [\"23929524\", \"23669360\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Calcineurin-binding site on Cav3.2 not residue-mapped\", \"Causality of Cav3.2 in adult cardiac disease in vivo not fully established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed Cav3.2-derived Ca2+ drives a developmental transcriptional program (calcineurin/NFAT/Sox9) required for chondrogenesis, broadening the channel's role beyond excitable signaling.\",\n      \"evidence\": \"Cav3.2-null mice, ATDC5 overexpression, NFAT inhibitors, luciferase/EMSA/ChIP on Sox9 promoter\",\n      \"pmids\": [\"24778262\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Ca2+ influx is gated in non-excitable chondrocytes unclear\", \"Other NFAT target genes not surveyed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined the trafficking/stability machinery controlling surface Cav3.2, identifying WWP1 ubiquitination and USP5 deubiquitination at the III-IV linker as the determinant of pain-relevant channel density.\",\n      \"evidence\": \"Proteomic screen, reciprocal Co-IP, shRNA, Tat peptide uncoupling, patch clamp and behavior\",\n      \"pmids\": [\"25189210\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific ubiquitinated lysines only partially defined\", \"Regulation of WWP1/USP5 activity in disease states addressed later\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Provided the in vivo phosphorylation map and post-translational/trafficking controls (glycosylation, calnexin), defining how channel gating and surface delivery are set biochemically.\",\n      \"evidence\": \"Brain immunopurification phosphoproteomics with mutagenesis; N-glycosylation mutagenesis with biotinylation; calnexin Co-IP and surface assays\",\n      \"pmids\": [\"26483470\", \"23503728\", \"28912545\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinases responsible for individual sites largely unassigned\", \"Quantitative contribution of each site to native current unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Connected gain-of-function gating directly to disease physiology: M1549V drives autonomous aldosterone production, and CAE-linked C456S enhances synaptic NMDA transmission and induces spike-wave discharges in vivo.\",\n      \"evidence\": \"Exome sequencing and patch clamp of mutants; synaptic recordings, in vivo cortical expression, EEG; cell-type-specific Cav3.2 conditional knockout\",\n      \"pmids\": [\"25907736\", \"26220996\", \"25600872\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How channel localizes to synapses/active zones mechanistically incomplete\", \"Translation of rodent epilepsy phenotype to human variant penetrance not addressed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Generalized the aldosteronism mechanism across multiple CACNA1H variants and demonstrated pharmacological reversibility, linking channel gain-of-function to CYP11B2 induction.\",\n      \"evidence\": \"Patch clamp of four variants plus M1549V in adrenocortical cells, aldosterone ELISA, CYP11B2 PCR, mibefradil rescue\",\n      \"pmids\": [\"27729216\", \"27258646\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular Ca2+ signaling chain not yet directly imaged here\", \"Adrenal in vivo confirmation came later\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Closed the mechanistic chain in primary aldosteronism in vivo, showing knockin M1549V raises glomerulosa intracellular Ca2+, aldosterone, and blood pressure.\",\n      \"evidence\": \"CRISPR knockin/knockout mice, BP telemetry, aldosterone/renin assays, adrenal slice Ca2+ imaging\",\n      \"pmids\": [\"33879608\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream Ca2+ effector pathway to CYP11B2 in vivo not fully dissected\", \"Modest BP effect leaves room for compensatory mechanisms\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified epigenetic/miRNA control of Cav3.2 in neuropathic pain, showing chromatin-silencing of miR-32-5p de-represses Cav3.2 to drive trigeminal pain.\",\n      \"evidence\": \"miRNA sequencing, histone methyltransferase inhibitors, lentiviral miRNA overexpression, patch clamp, behavior; plus USP5-SUMO and IL-1β/USP5 pain studies\",\n      \"pmids\": [\"35353623\", \"31455361\", \"28741432\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab findings without independent replication\", \"Relative contribution of transcriptional vs trafficking control to pain-state upregulation unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the many overlapping regulatory inputs (phosphorylation, glycosylation, ubiquitination/SUMO, redox, GPCR signaling, transcriptional and miRNA control) are integrated to set Cav3.2 function in a given cell type, and the structural basis of these modulations, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of regulated states in the corpus\", \"Quantitative hierarchy among regulators in native tissue undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 2, 5, 28]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [4, 8, 25, 26, 27]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 7, 44]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [18]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0162582\", \"supporting_discovery_ids\": [11, 12, 13]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [22, 29, 42]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [2, 16, 17, 49]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"WWP1\",\n      \"USP5\",\n      \"CALR\",\n      \"PPP3CA\",\n      \"HCN1\",\n      \"KCNMA1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}