{"gene":"CACNA1F","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2004,"finding":"CACNA1F encodes an L-type (dihydropyridine-sensitive) calcium channel (Cav1.4) with unusually slow voltage-dependent inactivation kinetics that are not affected by calcium ions or by coexpression of ancillary beta subunits; the channel supports a large window current and activates near -40 mV in 2 mM external calcium, making it suited for tonic calcium influx at photoreceptor resting potentials.","method":"Whole-cell patch clamp of transiently expressed human Cav1.4 in HEK cells; pharmacological profiling; introduction of CSNB2 missense mutations","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct electrophysiological reconstitution with mutagenesis in heterologous system, multiple biophysical parameters measured","pmids":["14973233"],"is_preprint":false},{"year":2005,"finding":"Single Cav1.4 channels have an extremely low open probability (<0.015) and a unitary conductance of ~4 pS (compared to ~20 pS for Cav1.2), with brief but sustained openings throughout depolarization accounting for the slow whole-cell inactivation; BayK8644 increases open time constant ~45% without introducing an additional gating mode.","method":"Cell-attached patch single-channel recordings in tsA-201 cells with 100 mM barium as charge carrier; kinetic analysis; comparison to Cav1.2","journal":"Biophysical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — single-channel reconstitution with rigorous biophysical analysis, single lab but multiple orthogonal parameters","pmids":["16085774"],"is_preprint":false},{"year":2004,"finding":"CaBP4 directly associates with the C-terminal domain of the Cav1.4 alpha1-subunit and shifts the activation of Cav1.4 to hyperpolarized voltages in transfected cells; CaBP4 is specifically expressed in photoreceptor synaptic terminals and its loss phenocopies CSNB2.","method":"Co-immunoprecipitation / direct binding assay with Cav1.4 C-terminal domain; electrophysiology in transfected cells; Cabp4 knockout mouse with ERG and immunocytochemistry","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding assay + functional electrophysiology + in vivo KO phenotype, replicated across methods","pmids":["15452577"],"is_preprint":false},{"year":2012,"finding":"CaBP4 increases Cav1.4 channel availability by interacting with the IQ motif of Cav1.4 and relieving the inhibitory effects of the C-terminal ICDI (inhibitor of Ca2+-dependent inactivation) domain on voltage-dependent gating; this effect requires the ICDI domain and is absent in an ICDI-deletion mutant. Disease-associated CaBP4 mutants interact with Cav1.4 but show reduced functional effects, leading to loss of channel availability.","method":"Whole-cell patch clamp of heterologously expressed Cav1.4; FRET experiments with fluorescent-protein-tagged constructs; site-directed mutagenesis of ICDI domain","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — FRET binding assay + patch clamp + mutagenesis, single lab with multiple orthogonal methods","pmids":["22936811"],"is_preprint":false},{"year":2009,"finding":"Calmodulin is pre-associated with the C-terminus of Cav1.4 (shown by FRET) and increases current density and slows voltage-dependent inactivation; the ICDI domain selectively abolishes Ca2+-dependent inactivation without displacing calmodulin or interfering with other calmodulin effects.","method":"FRET with cyan fluorescent protein variants; whole-cell patch clamp; ICDI deletion constructs","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — FRET binding assay + electrophysiology + domain deletion, single lab, multiple orthogonal methods","pmids":["19717559"],"is_preprint":false},{"year":2014,"finding":"NMR structures of CaBP4 in Mg2+- and Ca2+-bound states show that Ca2+-bound CaBP4 exposes residues (Phe137, Glu168, Leu207, Phe214, Met251, Phe264, Leu268) that contact the IQ motif in Cav1.4; the Cav1.4 mutant Y1595E strongly impairs CaBP4 binding, supporting a model in which CaBP4 forms a collapsed structure around the IQ motif to promote channel activation.","method":"NMR structure determination; mutational analysis of Cav1.4 IQ motif (Y1595E) with binding assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure plus mutagenesis-validated binding interface, single lab but rigorous structural plus functional validation","pmids":["25258313"],"is_preprint":false},{"year":2014,"finding":"Native retinal Cav1.4 channel complexes comprise the Cav1.4 alpha1 subunit, beta2 (including a novel variant beta2X13), and alpha2delta4; co-immunoprecipitation from transfected HEK293 cells and mouse retina confirmed these interactions. Alpha2delta4 confers weaker voltage-dependent activation than alpha2delta1; beta2X13 (vs. beta2a) produces greater voltage-dependent inactivation specifically in Cav1.4 but not Cav1.2.","method":"Co-immunoprecipitation from HEK293 cells and mouse retina; proximity ligation assays in retina; whole-cell patch clamp of defined subunit combinations","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP from native tissue + reconstitution electrophysiology, multiple orthogonal methods","pmids":["25468907"],"is_preprint":false},{"year":2016,"finding":"Exon 47 of CACNA1F encodes part of the C-terminal automodulatory domain (CTM) that suppresses Ca2+-dependent inactivation (CDI) and causes a positive shift in voltage-dependent activation; splice variants lacking exon 47 show intense CDI and activate at more hyperpolarized voltages. CaBP4 suppresses CDI of exon-47-lacking variants but does not shift their voltage-dependent activation, indicating exon 47 is necessary for CaBP4-mediated modulation of activation.","method":"Electrophysiology (whole-cell patch clamp) of splice variant constructs expressed in HEK cells; CaBP4 co-expression; RT-PCR of human/primate retina","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution electrophysiology with defined splice variants plus CaBP4 co-expression, multiple parameters measured","pmids":["27226626"],"is_preprint":false},{"year":2016,"finding":"PKA phosphorylation of the ICDI motif of Cav1.4 increases calmodulin occupancy on the channel, thereby increasing channel open probability and enabling Ca2+-dependent inactivation; introduction of the Cav1.4 ICDI into Cav1.3 or Cav1.2 transfers this PKA-modulation mechanism.","method":"Whole-cell patch clamp; PKA activation/inhibition; calmodulin FRET binding assay; domain swap experiments between Cav subtypes","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — electrophysiology + FRET + domain swaps, single lab, multiple orthogonal methods","pmids":["27456671"],"is_preprint":false},{"year":2005,"finding":"A missense mutation I745T in transmembrane segment IIS6 of CACNA1F causes a ~-30 mV shift in the voltage dependence of Cav1.4 channel activation (gain-of-function) and significantly slower inactivation kinetics, demonstrating that altered gating underlies this CSNB2-variant retinal disorder.","method":"Heterologous expression in Xenopus oocytes or mammalian cells; whole-cell patch clamp; voltage-clamp analysis of gating","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — electrophysiological reconstitution of disease mutation, validated in expression system, replicated in subsequent mouse model study","pmids":["15897456"],"is_preprint":false},{"year":2005,"finding":"Cacna1f knockout mice show 90% less peak calcium signal at photoreceptor synapses (by Fluo-4 calcium imaging), absence of post-receptoral ERG b-wave, profound loss of photoreceptor ribbon synapses, and abnormal dendritic sprouting of bipolar and horizontal cells into the outer nuclear layer, establishing Cav1.4 as essential for functional assembly and maintenance of photoreceptor ribbon synapses.","method":"Targeted Cacna1f knockout mouse (Cre-lox insertion in exon 7); ERG; calcium imaging in retinal slices; immunocytochemistry","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with multiple defined cellular phenotypes + calcium imaging + ERG, replicated across multiple subsequent studies","pmids":["16155113"],"is_preprint":false},{"year":2015,"finding":"Active-zone proteins RIM1 and RIM2 potently enhance Ca2+ influx through Cav1.4 channels in rod photoreceptor terminals; conditional double knockout of RIM1/2 from rods causes profound reduction in Ca2+ currents and ~4-fold reduction in spontaneous miniature release, and near-complete absence of evoked vesicle release, without altering Cav1.4 protein expression or localization at ribbons.","method":"Conditional double knockout of RIM1/2 in rods; whole-cell voltage clamp of isolated rods; membrane capacitance measurements; immunocytochemistry","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean conditional KO with electrophysiology + exocytosis assay + immunocytochemistry, single lab with multiple orthogonal methods","pmids":["26400943"],"is_preprint":false},{"year":2020,"finding":"Synaptic ribbons are required to stabilize Cav1.4/RIM2 clusters at rod photoreceptor active zones and are necessary for darkness-induced enrichment of Cav1.4/RIM2 at active zones; ribbon length and Cav1.4/RIM2 cluster length are tightly correlated, and both increase during dark adaptation.","method":"RIBEYE knockout mice (ribbon-deficient); immunofluorescence quantification of Cav1.4/RIM2 cluster length; dark/light adaptation paradigms","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO model with quantitative immunofluorescence, single lab, morphological endpoint without electrophysiological validation","pmids":["32249787"],"is_preprint":false},{"year":2007,"finding":"CSNB2 missense mutations G1007R and R1049W produce full-length Cav1.4 protein that targets to the membrane but supports no ionic current (loss-of-function); mutation F742C (S6 domain II) produces a ~21 mV hyperpolarizing shift in activation and inactivation (gain-of-function) with slower inactivation kinetics.","method":"Whole-cell patch clamp of mutant Cav1.4 transiently expressed in HEK tsA-201 cells; Western blot for protein expression","journal":"Neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Moderate — electrophysiological reconstitution with multiple disease mutations, single lab with functional and biochemical methods","pmids":["17949918"],"is_preprint":false},{"year":2006,"finding":"CSNB2 missense mutations R508Q and L1364H alter Cav1.4 protein expression density rather than channel gating; both mutations affect total alpha1 protein expression in a temperature-dependent manner in mammalian cells, providing a distinct pathological mechanism from gating alterations.","method":"Heterologous expression in Xenopus oocytes and tsA-201 cells; whole-cell patch clamp; Western blot for protein levels; temperature-dependent experiments","journal":"Journal of neurochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution electrophysiology + protein quantification + temperature dependence, single lab, multiple methods","pmids":["16476079"],"is_preprint":false},{"year":2014,"finding":"CSNB2 mutation L860P causes loss-of-function via reduced number of functional channels at the plasma membrane (confirmed by gating current and non-stationary noise analyses) associated with increased protein turnover; C-terminal truncation R1827X causes apparent gain-of-function (hyperpolarizing shift of IV-curve, increased single-channel activity) but also unmasks Ca2+-dependent inactivation by removing the C-terminal modulatory domain, thereby failing to support continuous Ca2+ influx.","method":"Whole-cell and single-channel patch clamp; gating current measurements; non-stationary noise analysis; protein turnover assays","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1 / Moderate — single-channel + gating current + noise analysis + turnover in single rigorous study","pmids":["24796500"],"is_preprint":false},{"year":2007,"finding":"Increasing temperature from 23°C to 37°C shifts Cav1.4 window current to more hyperpolarized voltages and accelerates inactivation ~50-fold (Q10=18.8), compared to only ~10-fold for Cav1.2, yet the window current is preserved at near-physiological temperatures, supporting tonic glutamate release from photoreceptors.","method":"Whole-cell patch clamp of human Cav1.4 cDNA at varying temperatures (23–37°C); comparison with Cav1.2","journal":"Neuroscience","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — rigorous electrophysiology, single lab, single method","pmids":["18206315"],"is_preprint":false},{"year":2008,"finding":"The nob2 mouse Cav1.4 alternatively spliced N-terminus (from ETn insertion) fails to interact with cytoskeletal filamin proteins in a pulldown assay, whereas wild-type Cav1.4 N-terminus does interact with filamins, identifying an N-terminal filamin-binding function of Cav1.4.","method":"Biochemical pulldown assay; cloning and sequencing of alternatively spliced mRNA; Western blot; electrophysiology","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct pulldown with defined domain, single lab, single binding assay method","pmids":["18596967"],"is_preprint":false},{"year":2019,"finding":"Introduction of Cav alpha1F by in vivo electroporation into Cav1.4 knockout rod terminals rescues synaptic development markers (PSD-95 expression, elongated ribbons) even in adult animals; induced expression in mature rods also rescues ribbon formation but yields diffuse rather than clustered channel distribution, demonstrating that Cav1.4 expression is necessary and sufficient for rod synaptic terminal development and that this plasticity persists in adult retina.","method":"In vivo electroporation of Cav alpha1F into KO rods; tamoxifen-inducible expression system; immunohistochemistry for PSD-95 and ribbon markers; vision-guided water maze","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — rescue experiment in KO with morphological and behavioral readouts, single lab","pmids":["31335952"],"is_preprint":false},{"year":2016,"finding":"In the Cav1.4-IT gain-of-function mouse retina, altered Cav1.4 activity leads to loss of contrast enhancement, reduced spatial response, changes in contrast sensitivity of ganglion cells, photoreceptor degeneration (nodular cone axons, enlarged pedicles), and reduced expression of mGluR6 and Connexin 36; plasma-membrane calcium ATPase 1 expression pattern is changed, suggesting a compensatory calcium homeostasis mechanism.","method":"Multielectrode array recordings from whole-mounted retinas; immunohistochemistry; optokinetic response testing","journal":"Channels (Austin, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional retinal recordings + morphology in defined gain-of-function mouse model, single lab","pmids":["26274509"],"is_preprint":false},{"year":2016,"finding":"Genetic deletion of Cav1.4 (Cacna1f) in rd1 mice reduces calpain activation during photoreceptor degeneration and provides short-term preservation of photoreceptors, establishing Cav1.4-mediated Ca2+ influx as a contributor to calpain-dependent photoreceptor cell death.","method":"Cacna1f x rd1 double mutant mouse; optical coherence tomography; TUNEL assay; calpain activity measurement","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — double KO with defined molecular readout (calpain activation), single lab","pmids":["27270916"],"is_preprint":false},{"year":2023,"finding":"Gating charge neutralization mutations R964G and R1288L in Cav1.4 voltage sensor S4 segments reduce channel expression and ON gating currents; R1288L additionally reduces single-channel current amplitude; molecular dynamics simulations indicate R1288L creates water wires in both resting and active states, suggesting pathological omega (ω) currents as a disease mechanism.","method":"Whole-cell and single-channel patch clamp; gating current measurements; molecular dynamics simulations","journal":"Channels (Austin, Tex.)","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — electrophysiology with gating currents + MD simulation, single lab; MD simulation supports but does not directly demonstrate omega currents","pmids":["36943941"],"is_preprint":false},{"year":2026,"finding":"The CaV3 channel antagonists ML218 and Z944 inhibit Cav1.4 channels (IC50 ~2 µM and ~30 µM respectively); structure-based modeling and mutagenesis identified methionine M1004 within the DHP-binding site as critical for ML218 potency, with M1004 mutation having a 10-fold greater impact than the conserved threonine T1007 required for DHP sensitivity.","method":"Whole-cell patch clamp of HEK293T cells transfected with Cav1.4 + beta2x13 + alpha2delta-4; structure-based homology modeling; M1004 and T1007 mutagenesis","journal":"The Journal of general physiology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — electrophysiology with mutagenesis + structural modeling identifying specific binding site residue, single lab, multiple methods","pmids":["41489546"],"is_preprint":false}],"current_model":"CACNA1F encodes Cav1.4, a retinal L-type voltage-gated calcium channel with uniquely slow inactivation (due to a C-terminal ICDI domain that suppresses Ca2+-dependent inactivation by binding the IQ motif and tethering calmodulin), very low open probability (~4 pS unitary conductance), and a large window current near photoreceptor resting potential that sustains tonic glutamate release at ribbon synapses; its activity is regulated by CaBP4 (which binds the IQ motif and relieves ICDI-mediated inhibition), by PKA phosphorylation of the ICDI domain (promoting calmodulin occupancy and Ca2+-dependent inactivation), by auxiliary subunits beta2 and alpha2delta4, and by active-zone scaffold proteins RIM1/2 (which enhance Ca2+ influx without affecting channel localization); Cav1.4 also serves as a structural organizer of photoreceptor ribbon synapses whose assembly and maintenance require Cav1.4 expression, and disease mutations in CACNA1F cause a spectrum of Cav1.4 dysfunction ranging from loss-of-function (absent currents, reduced protein expression, misfolding) to gain-of-function (hyperpolarizing shifts in activation) that underlie X-linked congenital stationary night blindness type 2 and related retinal channelopathies."},"narrative":{"mechanistic_narrative":"CACNA1F encodes Cav1.4, an L-type voltage-gated calcium channel specialized for tonic calcium influx at photoreceptor ribbon synapses [PMID:14973233]. Its defining biophysical signature is unusually slow voltage-dependent inactivation that is insensitive to calcium and to beta subunits, together with activation near -40 mV that generates a large window current poised to operate at photoreceptor resting potentials [PMID:14973233]; single channels display very low open probability and a small (~4 pS) unitary conductance with sustained brief openings that account for the slow macroscopic inactivation [PMID:16085774], and the window current is preserved at physiological temperature to support continuous transmitter release [PMID:18206315]. The slow inactivation arises from a C-terminal automodulatory/ICDI domain (encoded in part by exon 47) that suppresses Ca2+-dependent inactivation without displacing pre-associated calmodulin, while also producing a depolarizing shift in activation [PMID:19717559, PMID:27226626]. This autoinhibition is relieved by CaBP4, which binds the IQ motif, shifts activation to hyperpolarized voltages and increases channel availability in an ICDI-dependent manner, with the Ca2+-bound CaBP4 structure collapsing around the IQ motif (Cav1.4 Y1595 critical) [PMID:15452577, PMID:22936811, PMID:25258313]; PKA phosphorylation of the ICDI domain provides a second layer of regulation by increasing calmodulin occupancy and restoring Ca2+-dependent inactivation [PMID:27456671]. Native channels assemble with auxiliary beta2 (including the beta2X13 variant) and alpha2delta4 subunits, and active-zone scaffolds RIM1/2 enhance Ca2+ influx and evoked vesicle release without changing channel localization [PMID:25468907, PMID:26400943]. Beyond its conductance role, Cav1.4 is a structural organizer of photoreceptor ribbon synapses: its loss abolishes the ERG b-wave, eliminates ribbon synapses and causes aberrant bipolar/horizontal cell sprouting, and re-introduction of Cav1.4 is necessary and sufficient to rescue synaptic development even in adult retina, with ribbons reciprocally stabilizing Cav1.4/RIM2 clusters [PMID:16155113, PMID:32249787, PMID:31335952]. CACNA1F mutations cause X-linked congenital stationary night blindness type 2, acting through a spectrum of loss-of-function (absent current despite membrane targeting, reduced or temperature-dependent expression, increased turnover, gating-charge neutralization) and gain-of-function (hyperpolarizing activation shifts) mechanisms [PMID:15897456, PMID:17949918, PMID:16476079, PMID:24796500, PMID:36943941].","teleology":[{"year":2004,"claim":"Established the defining biophysical identity of Cav1.4 as an L-type channel with calcium- and beta-independent slow inactivation and a large window current suited to photoreceptor resting potentials, explaining how a calcium channel could support tonic signaling.","evidence":"Whole-cell patch clamp of heterologously expressed human Cav1.4 with CSNB2 mutations in HEK cells","pmids":["14973233"],"confidence":"High","gaps":["Did not resolve the molecular basis of slow inactivation","Native subunit composition not addressed"]},{"year":2004,"claim":"Identified CaBP4 as a direct C-terminal binding partner that hyperpolarizes Cav1.4 activation and whose loss phenocopies CSNB2, linking channel modulation to disease.","evidence":"Co-IP/binding assay, electrophysiology in transfected cells, and Cabp4 knockout mouse ERG/immunocytochemistry","pmids":["15452577"],"confidence":"High","gaps":["Binding site on Cav1.4 not yet mapped","Mechanism relative to autoinhibition unknown"]},{"year":2005,"claim":"Resolved the single-channel basis of slow macroscopic inactivation, showing very low open probability and small unitary conductance with sustained brief openings.","evidence":"Cell-attached single-channel recordings in tsA-201 cells with barium and kinetic analysis","pmids":["16085774"],"confidence":"High","gaps":["Structural determinant of low conductance not identified","Native-tissue confirmation absent"]},{"year":2005,"claim":"Demonstrated in vivo that Cav1.4 is essential for assembly and maintenance of photoreceptor ribbon synapses, not merely for synaptic calcium signaling, by showing ribbon loss and aberrant neurite sprouting in knockouts.","evidence":"Targeted Cacna1f knockout mouse with ERG, calcium imaging in retinal slices, and immunocytochemistry","pmids":["16155113"],"confidence":"High","gaps":["Whether the structural role requires channel conductance was not separated from expression","Molecular pathway from channel to ribbon assembly unknown"]},{"year":2005,"claim":"Defined gain-of-function as one disease mechanism by showing a CSNB2 mutation that hyperpolarizes activation and slows inactivation.","evidence":"Heterologous expression and whole-cell/voltage-clamp gating analysis of I745T","pmids":["15897456"],"confidence":"High","gaps":["In vivo consequence of the gating shift not tested here","Did not address other mutation classes"]},{"year":2006,"claim":"Revealed a distinct disease mechanism in which mutations alter channel protein expression density rather than gating, in a temperature-dependent manner.","evidence":"Heterologous expression in oocytes and tsA-201 cells with patch clamp, Western blot, and temperature-dependent assays of R508Q/L1364H","pmids":["16476079"],"confidence":"High","gaps":["Trafficking/folding pathway affected not defined","Relevance to native photoreceptor expression untested"]},{"year":2007,"claim":"Broadened the mutational spectrum by showing membrane-targeted but current-null loss-of-function and gating-shift gain-of-function alleles can coexist in CSNB2.","evidence":"Whole-cell patch clamp and Western blot of G1007R, R1049W and F742C in HEK tsA-201 cells","pmids":["17949918"],"confidence":"High","gaps":["Why membrane-resident mutants conduct no current is unexplained","No structural model of affected residues"]},{"year":2008,"claim":"Showed that temperature strongly tunes Cav1.4 gating yet preserves the window current near physiological temperature, reconciling biophysics with tonic photoreceptor release.","evidence":"Whole-cell patch clamp of human Cav1.4 across 23-37C compared to Cav1.2","pmids":["18206315"],"confidence":"Medium","gaps":["Single method, single lab","No native-tissue validation of preserved window current"]},{"year":2008,"claim":"Identified an N-terminal filamin-binding function lost in the nob2 splice variant, hinting at a cytoskeletal anchoring role for Cav1.4.","evidence":"Biochemical pulldown of wild-type vs spliced N-terminus with filamins plus cloning and electrophysiology","pmids":["18596967"],"confidence":"Medium","gaps":["Single binding assay without reciprocal validation","Functional consequence of filamin binding in vivo not established"]},{"year":2009,"claim":"Pinpointed the C-terminal ICDI domain as the element that abolishes Ca2+-dependent inactivation without displacing pre-associated calmodulin, mechanistically explaining slow inactivation.","evidence":"FRET, whole-cell patch clamp, and ICDI deletion constructs","pmids":["19717559"],"confidence":"High","gaps":["Atomic structure of the ICDI-CaM-IQ interaction not resolved","Regulation of ICDI engagement not addressed"]},{"year":2012,"claim":"Showed mechanistically that CaBP4 increases channel availability by binding the IQ motif and relieving ICDI-mediated inhibition, and that disease CaBP4 mutants bind but fail to relieve it.","evidence":"Whole-cell patch clamp, FRET, and ICDI-deletion mutagenesis in heterologous cells","pmids":["22936811"],"confidence":"High","gaps":["Structural basis of CaBP4-IQ engagement not yet defined","Native-tissue stoichiometry unknown"]},{"year":2014,"claim":"Provided the structural model of CaBP4-Cav1.4 engagement, showing Ca2+-bound CaBP4 collapses around the IQ motif via defined contact residues and that Cav1.4 Y1595 is required.","evidence":"NMR structures of CaBP4 in Mg2+/Ca2+ states with IQ-motif Y1595E mutagenesis binding assay","pmids":["25258313"],"confidence":"High","gaps":["No full-length channel-CaBP4 complex structure","Dynamics of CaM/CaBP4 exchange not resolved"]},{"year":2014,"claim":"Defined the native retinal channel as a Cav1.4/beta2(beta2X13)/alpha2delta4 complex and showed these specific auxiliary subunits tune activation and inactivation.","evidence":"Co-IP from HEK293 and mouse retina, proximity ligation assays, and patch clamp of defined subunit combinations","pmids":["25468907"],"confidence":"High","gaps":["Stoichiometry of native complex not quantified","How subunits influence the structural synaptic role untested"]},{"year":2014,"claim":"Distinguished mechanistically distinct disease alleles, including reduced surface channel number with increased turnover and a C-terminal truncation that gains function biophysically but loses tonic Ca2+ influx by unmasking CDI.","evidence":"Whole-cell/single-channel patch clamp, gating current, noise analysis, and turnover assays of L860P and R1827X","pmids":["24796500"],"confidence":"High","gaps":["In vivo synaptic consequences not tested","Trafficking machinery responsible for turnover unidentified"]},{"year":2015,"claim":"Established RIM1/2 as active-zone regulators that potently enhance Cav1.4 Ca2+ influx and are required for evoked vesicle release without affecting channel localization.","evidence":"Conditional RIM1/2 double knockout in rods with voltage clamp, capacitance measurements, and immunocytochemistry","pmids":["26400943"],"confidence":"High","gaps":["Direct physical RIM-Cav1.4 interaction interface not mapped here","Mechanism of current enhancement vs release coupling not separated"]},{"year":2016,"claim":"Mapped exon 47 to the C-terminal automodulatory domain, showing it suppresses CDI, shifts activation positive, and is required for CaBP4-mediated modulation of activation.","evidence":"Patch clamp of splice-variant constructs with CaBP4 co-expression and retinal RT-PCR","pmids":["27226626"],"confidence":"High","gaps":["Relative abundance of splice variants in vivo not quantified","Regulation of splicing unknown"]},{"year":2016,"claim":"Identified PKA phosphorylation of the ICDI domain as a regulatory switch that increases CaM occupancy and restores Ca2+-dependent inactivation, transferable to other Cav1 subtypes.","evidence":"Patch clamp with PKA modulation, CaM FRET, and ICDI domain-swap experiments","pmids":["27456671"],"confidence":"High","gaps":["Phosphorylation site(s) not pinpointed","Physiological signaling context in photoreceptors untested"]},{"year":2016,"claim":"Showed in a gain-of-function mouse that altered Cav1.4 activity disrupts retinal circuit function, causes photoreceptor degeneration, and changes synaptic marker expression with compensatory calcium-handling changes.","evidence":"Multielectrode array recordings, immunohistochemistry, and optokinetic testing in Cav1.4-IT mice","pmids":["26274509"],"confidence":"Medium","gaps":["Causal chain from gating shift to degeneration not dissected","Single model, single lab"]},{"year":2016,"claim":"Implicated Cav1.4-mediated Ca2+ influx as a contributor to calpain-dependent photoreceptor death by showing its deletion reduces calpain activation in degenerating retina.","evidence":"Cacna1f x rd1 double-mutant mouse with OCT, TUNEL, and calpain activity assays","pmids":["27270916"],"confidence":"Medium","gaps":["Only short-term preservation shown","Generalizability beyond rd1 degeneration unknown"]},{"year":2019,"claim":"Demonstrated that Cav1.4 expression is necessary and sufficient for rod synaptic terminal development with persisting plasticity in adult retina, though clustered localization requires developmental context.","evidence":"In vivo electroporation and tamoxifen-inducible re-expression in KO rods with immunohistochemistry and behavioral testing","pmids":["31335952"],"confidence":"Medium","gaps":["Why mature induction yields diffuse rather than clustered channels unexplained","Functional restoration of vision incompletely characterized"]},{"year":2020,"claim":"Showed reciprocity in synaptic organization: ribbons stabilize and dark-adaptation enriches Cav1.4/RIM2 clusters at active zones.","evidence":"RIBEYE knockout mice with quantitative immunofluorescence and dark/light adaptation paradigms","pmids":["32249787"],"confidence":"Medium","gaps":["Morphological endpoint without electrophysiological validation","Molecular mechanism of ribbon-dependent stabilization unknown"]},{"year":2023,"claim":"Proposed gating-charge neutralization as a disease mechanism in which voltage-sensor mutations reduce expression and gating currents and may generate pathological omega currents.","evidence":"Whole-cell/single-channel patch clamp, gating currents, and molecular dynamics simulations of R964G and R1288L","pmids":["36943941"],"confidence":"Medium","gaps":["Omega currents inferred from simulation, not directly measured","In vivo consequence untested"]},{"year":2026,"claim":"Identified Cav3 antagonists as Cav1.4 inhibitors and mapped a DHP-site residue (M1004) critical for ML218 potency, providing pharmacological tools and binding-site insight.","evidence":"Patch clamp of Cav1.4/beta2x13/alpha2delta4 in HEK293T cells with structure-based modeling and M1004/T1007 mutagenesis","pmids":["41489546"],"confidence":"High","gaps":["Therapeutic relevance in retina not tested","No experimental structure of the drug-bound channel"]},{"year":null,"claim":"How Cav1.4 expression mechanistically drives ribbon synapse assembly — and whether this structural role is separable from ion conduction — remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No molecular pathway linking Cav1.4 to ribbon scaffold assembly","Conduction-independent structural role not directly tested","No atomic-resolution structure of the native channel complex"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,1,16]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,9]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[10,18]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[13,15]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[17]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[10,11]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,8]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[9,13,14,15]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[11]}],"complexes":["Cav1.4/beta2/alpha2delta4 channel complex","photoreceptor ribbon synapse active zone"],"partners":["CABP4","CALM1","RIM1","RIM2","CACNB2","CACNA2D4","FLNA","RIBEYE"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O60840","full_name":"Voltage-dependent L-type calcium channel subunit alpha-1F","aliases":["Voltage-gated calcium channel subunit alpha Cav1.4"],"length_aa":1977,"mass_kda":220.7,"function":"Voltage-sensitive calcium channels (VSCC) mediate the entry of calcium ions into excitable cells and are also involved in a variety of calcium-dependent processes, including muscle contraction, hormone or neurotransmitter release, gene expression, cell motility, cell division and cell death. The isoform alpha-1F gives rise to L-type calcium currents. Long-lasting (L-type) calcium channels belong to the 'high-voltage activated' (HVA) group. They are blocked by dihydropyridines (DHP), phenylalkylamines, and by benzothiazepines. Activates at more negative voltages and does not undergo calcium-dependent inactivation (CDI), due to incoming calcium ions, during depolarization Voltage-dependent L-type calcium channel activates at more hyperpolarized voltages and exhibits a robust calcium-dependent inactivation (CDI), due to incoming calcium ions, during depolarizations Voltage-sensitive calcium channels (VSCC) mediate the entry of calcium ions into excitable cells and are also involved in a variety of calcium-dependent processes, including muscle contraction, hormone or neurotransmitter release, gene expression, cell motility, cell division and cell death Voltage-dependent L-type calcium channel activates at more hyperpolarized voltages and exhibits a robust calcium-dependent inactivation (CDI), due to incoming calcium ions, during depolarizations","subcellular_location":"Membrane","url":"https://www.uniprot.org/uniprotkb/O60840/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CACNA1F","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CACNA1F","total_profiled":1310},"omim":[{"mim_id":"610427","title":"CONE-ROD SYNAPTIC DISORDER, CONGENITAL NONPROGRESSIVE; CRSD","url":"https://www.omim.org/entry/610427"},{"mim_id":"608965","title":"CALCIUM-BINDING PROTEIN 4; CABP4","url":"https://www.omim.org/entry/608965"},{"mim_id":"310500","title":"NIGHT BLINDNESS, CONGENITAL STATIONARY, TYPE 1A; CSNB1A","url":"https://www.omim.org/entry/310500"},{"mim_id":"304020","title":"CONE-ROD DYSTROPHY, X-LINKED, 1; CORDX1","url":"https://www.omim.org/entry/304020"},{"mim_id":"303700","title":"BLUE CONE MONOCHROMACY; BCM","url":"https://www.omim.org/entry/303700"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"retina","ntpm":116.2}],"url":"https://www.proteinatlas.org/search/CACNA1F"},"hgnc":{"alias_symbol":["Cav1.4","JM8","JMC8","CSNBX2","CORDX3","CSNB2A","OA2"],"prev_symbol":["CSNB2","AIED"]},"alphafold":{"accession":"O60840","domains":[{"cath_id":"1.20.120.350","chopping":"71-182_206-220","consensus_level":"high","plddt":80.2253,"start":71,"end":220},{"cath_id":"1.20.120.350","chopping":"529-639","consensus_level":"medium","plddt":81.5641,"start":529,"end":639},{"cath_id":"1.10.287.70","chopping":"655-772","consensus_level":"medium","plddt":81.3011,"start":655,"end":772},{"cath_id":"1.20.120.350","chopping":"854-974","consensus_level":"medium","plddt":81.7878,"start":854,"end":974},{"cath_id":"-","chopping":"990-1058_1068-1149","consensus_level":"medium","plddt":83.7124,"start":990,"end":1149},{"cath_id":"1.20.120.350","chopping":"1179-1276_1290-1309","consensus_level":"high","plddt":85.9253,"start":1179,"end":1309},{"cath_id":"1.10.238.10","chopping":"1451-1601","consensus_level":"medium","plddt":77.1977,"start":1451,"end":1601}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O60840","model_url":"https://alphafold.ebi.ac.uk/files/AF-O60840-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O60840-F1-predicted_aligned_error_v6.png","plddt_mean":66.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CACNA1F","jax_strain_url":"https://www.jax.org/strain/search?query=CACNA1F"},"sequence":{"accession":"O60840","fasta_url":"https://rest.uniprot.org/uniprotkb/O60840.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O60840/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O60840"}},"corpus_meta":[{"pmid":"15452577","id":"PMC_15452577","title":"Essential role of Ca2+-binding protein 4, a Cav1.4 channel regulator, in photoreceptor synaptic function.","date":"2004","source":"Nature neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/15452577","citation_count":245,"is_preprint":false},{"pmid":"16155113","id":"PMC_16155113","title":"Mutation of the calcium channel gene Cacna1f disrupts calcium signaling, synaptic transmission and cellular organization in mouse retina.","date":"2005","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/16155113","citation_count":214,"is_preprint":false},{"pmid":"16597347","id":"PMC_16597347","title":"The nob2 mouse, a null mutation in Cacna1f: anatomical and functional abnormalities in the outer retina and their consequences on ganglion cell visual responses.","date":"2006","source":"Visual neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/16597347","citation_count":174,"is_preprint":false},{"pmid":"14973233","id":"PMC_14973233","title":"The CACNA1F gene encodes an L-type calcium channel with unique biophysical properties and tissue distribution.","date":"2004","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/14973233","citation_count":160,"is_preprint":false},{"pmid":"3893507","id":"PMC_3893507","title":"Advanced seminoma: treatment with cis-platinum-based combination chemotherapy or carboplatin (JM8).","date":"1985","source":"British journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/3893507","citation_count":123,"is_preprint":false},{"pmid":"15897456","id":"PMC_15897456","title":"A CACNA1F mutation identified in an X-linked retinal disorder shifts the voltage dependence of Cav1.4 channel activation.","date":"2005","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/15897456","citation_count":110,"is_preprint":false},{"pmid":"2821197","id":"PMC_2821197","title":"Carboplatin (CBDCA, JM-8) and VP-16-213 in previously untreated patients with small-cell lung cancer.","date":"1987","source":"Journal of clinical oncology : official journal of the American Society of Clinical Oncology","url":"https://pubmed.ncbi.nlm.nih.gov/2821197","citation_count":99,"is_preprint":false},{"pmid":"3027268","id":"PMC_3027268","title":"Carboplatin (Paraplatin; JM8) and etoposide (VP-16) as first-line combination therapy for small-cell lung cancer.","date":"1987","source":"Journal of clinical oncology : official journal of the American Society of Clinical Oncology","url":"https://pubmed.ncbi.nlm.nih.gov/3027268","citation_count":97,"is_preprint":false},{"pmid":"16505158","id":"PMC_16505158","title":"X linked cone-rod dystrophy, CORDX3, is caused by a mutation in the CACNA1F gene.","date":"2006","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/16505158","citation_count":77,"is_preprint":false},{"pmid":"11281458","id":"PMC_11281458","title":"A summary of 20 CACNA1F mutations identified in 36 families with incomplete X-linked congenital stationary night blindness, and characterization of splice variants.","date":"2001","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11281458","citation_count":75,"is_preprint":false},{"pmid":"10900517","id":"PMC_10900517","title":"Clinical variability among patients with incomplete X-linked congenital stationary night blindness and a founder mutation in CACNA1F.","date":"2000","source":"Canadian journal of ophthalmology. Journal canadien d'ophtalmologie","url":"https://pubmed.ncbi.nlm.nih.gov/10900517","citation_count":73,"is_preprint":false},{"pmid":"12111638","id":"PMC_12111638","title":"Thirty distinct CACNA1F mutations in 33 families with incomplete type of XLCSNB and Cacna1f expression profiling in mouse retina.","date":"2002","source":"European journal of human genetics : EJHG","url":"https://pubmed.ncbi.nlm.nih.gov/12111638","citation_count":68,"is_preprint":false},{"pmid":"15807819","id":"PMC_15807819","title":"Clinical manifestations of a unique X-linked retinal disorder in a large New Zealand family with a novel mutation in CACNA1F, the gene responsible for CSNB2.","date":"2005","source":"Clinical & experimental ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/15807819","citation_count":66,"is_preprint":false},{"pmid":"24051672","id":"PMC_24051672","title":"Cav1.4 IT mouse as model for vision impairment in human congenital stationary night blindness type 2.","date":"2013","source":"Channels (Austin, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/24051672","citation_count":53,"is_preprint":false},{"pmid":"25468907","id":"PMC_25468907","title":"Characterization of Cav1.4 complexes (α11.4, β2, and α2δ4) in HEK293T cells and in the retina.","date":"2014","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/25468907","citation_count":52,"is_preprint":false},{"pmid":"17525176","id":"PMC_17525176","title":"A novel CACNA1F gene mutation causes Aland Island eye disease.","date":"2007","source":"Investigative ophthalmology & visual science","url":"https://pubmed.ncbi.nlm.nih.gov/17525176","citation_count":51,"is_preprint":false},{"pmid":"3086808","id":"PMC_3086808","title":"Ototoxicity of cisplatin vs. platinum analogs CBDCA (JM-8) and CHIP (JM-9).","date":"1986","source":"Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery","url":"https://pubmed.ncbi.nlm.nih.gov/3086808","citation_count":48,"is_preprint":false},{"pmid":"26400943","id":"PMC_26400943","title":"RIM1/2-Mediated Facilitation of Cav1.4 Channel Opening Is Required for Ca2+-Stimulated Release in Mouse Rod Photoreceptors.","date":"2015","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/26400943","citation_count":46,"is_preprint":false},{"pmid":"22936811","id":"PMC_22936811","title":"Complex regulation of voltage-dependent activation and inactivation properties of retinal voltage-gated Cav1.4 L-type Ca2+ channels by Ca2+-binding protein 4 (CaBP4).","date":"2012","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/22936811","citation_count":45,"is_preprint":false},{"pmid":"7793962","id":"PMC_7793962","title":"Overproduction, purification, and biochemical characterization of a xylanase (Xys1) from Streptomyces halstedii JM8.","date":"1995","source":"Applied and environmental microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/7793962","citation_count":43,"is_preprint":false},{"pmid":"11381068","id":"PMC_11381068","title":"Novel CACNA1F mutations in Japanese patients with incomplete congenital stationary night blindness.","date":"2001","source":"Investigative ophthalmology & visual science","url":"https://pubmed.ncbi.nlm.nih.gov/11381068","citation_count":40,"is_preprint":false},{"pmid":"24163243","id":"PMC_24163243","title":"Mosaic synaptopathy and functional defects in Cav1.4 heterozygous mice and human carriers of CSNB2.","date":"2013","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/24163243","citation_count":39,"is_preprint":false},{"pmid":"12860808","id":"PMC_12860808","title":"Retinal and optic disc atrophy associated with a CACNA1F mutation in a Japanese family.","date":"2003","source":"Archives of ophthalmology (Chicago, Ill. : 1960)","url":"https://pubmed.ncbi.nlm.nih.gov/12860808","citation_count":37,"is_preprint":false},{"pmid":"3002624","id":"PMC_3002624","title":"Carboplatin (JM8) as a single agent and in combination in the treatment of small cell lung cancer.","date":"1985","source":"Cancer treatment reviews","url":"https://pubmed.ncbi.nlm.nih.gov/3002624","citation_count":37,"is_preprint":false},{"pmid":"15761389","id":"PMC_15761389","title":"Novel mutations in CACNA1F and NYX in Dutch families with X-linked congenital stationary night blindness.","date":"2005","source":"Molecular vision","url":"https://pubmed.ncbi.nlm.nih.gov/15761389","citation_count":34,"is_preprint":false},{"pmid":"16085774","id":"PMC_16085774","title":"Cav1.4 encodes a calcium channel with low open probability and unitary conductance.","date":"2005","source":"Biophysical journal","url":"https://pubmed.ncbi.nlm.nih.gov/16085774","citation_count":34,"is_preprint":false},{"pmid":"32249787","id":"PMC_32249787","title":"Synaptic ribbons foster active zone stability and illumination-dependent active zone enrichment of RIM2 and Cav1.4 in photoreceptor synapses.","date":"2020","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/32249787","citation_count":34,"is_preprint":false},{"pmid":"11797049","id":"PMC_11797049","title":"Expression of the genes coding for the xylanase Xys1 and the cellulase Cel1 from the straw-decomposing Streptomyces halstedii JM8 cloned into the amino-acid producer Brevibacterium lactofermentum ATCC13869.","date":"2001","source":"Archives of microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/11797049","citation_count":34,"is_preprint":false},{"pmid":"12552565","id":"PMC_12552565","title":"Mutations in the CACNA1F and NYX genes in British CSNBX families.","date":"2003","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/12552565","citation_count":32,"is_preprint":false},{"pmid":"1400190","id":"PMC_1400190","title":"Cloning and nucleotide sequence of celA1, and endo-beta-1,4-glucanase-encoding gene from Streptomyces halstedii JM8.","date":"1992","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/1400190","citation_count":32,"is_preprint":false},{"pmid":"24124559","id":"PMC_24124559","title":"A novel large in-frame deletion within the CACNA1F gene associates with a cone-rod dystrophy 3-like phenotype.","date":"2013","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24124559","citation_count":31,"is_preprint":false},{"pmid":"18596967","id":"PMC_18596967","title":"Modified Ca(v)1.4 expression in the Cacna1f(nob2) mouse due to alternative splicing of an ETn inserted in exon 2.","date":"2008","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/18596967","citation_count":30,"is_preprint":false},{"pmid":"18206315","id":"PMC_18206315","title":"Temperature dependence of Cav1.4 calcium channel gating.","date":"2007","source":"Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/18206315","citation_count":30,"is_preprint":false},{"pmid":"27226626","id":"PMC_27226626","title":"Characterization of C-terminal Splice Variants of Cav1.4 Ca2+ Channels in Human Retina.","date":"2016","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/27226626","citation_count":30,"is_preprint":false},{"pmid":"16476079","id":"PMC_16476079","title":"Effects of congenital stationary night blindness type 2 mutations R508Q and L1364H on Cav1.4 L-type Ca2+ channel function and expression.","date":"2006","source":"Journal of neurochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16476079","citation_count":30,"is_preprint":false},{"pmid":"9251186","id":"PMC_9251186","title":"Analysis of xysA, a gene from Streptomyces halstedii JM8 that encodes a 45-kilodalton modular xylanase, Xys1.","date":"1997","source":"Applied and environmental microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/9251186","citation_count":29,"is_preprint":false},{"pmid":"17949918","id":"PMC_17949918","title":"Functional analysis of congenital stationary night blindness type-2 CACNA1F mutations F742C, G1007R, and R1049W.","date":"2007","source":"Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/17949918","citation_count":28,"is_preprint":false},{"pmid":"22194652","id":"PMC_22194652","title":"A novel p.Gly603Arg mutation in CACNA1F causes Åland island eye disease and incomplete congenital stationary night blindness phenotypes in a family.","date":"2011","source":"Molecular vision","url":"https://pubmed.ncbi.nlm.nih.gov/22194652","citation_count":28,"is_preprint":false},{"pmid":"20238058","id":"PMC_20238058","title":"Congenital stationary night blindness in mice - a tale of two Cacna1f mutants.","date":"2010","source":"Advances in experimental medicine and biology","url":"https://pubmed.ncbi.nlm.nih.gov/20238058","citation_count":27,"is_preprint":false},{"pmid":"30825406","id":"PMC_30825406","title":"Where are the missing gene defects in inherited retinal disorders? Intronic and synonymous variants contribute at least to 4% of CACNA1F-mediated inherited retinal disorders.","date":"2019","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/30825406","citation_count":27,"is_preprint":false},{"pmid":"19717559","id":"PMC_19717559","title":"Calmodulin is a functional regulator of Cav1.4 L-type Ca2+ channels.","date":"2009","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/19717559","citation_count":26,"is_preprint":false},{"pmid":"29062221","id":"PMC_29062221","title":"The importance of genetic testing as demonstrated by two cases of CACNA1F-associated retinal generation misdiagnosed as LCA.","date":"2017","source":"Molecular vision","url":"https://pubmed.ncbi.nlm.nih.gov/29062221","citation_count":26,"is_preprint":false},{"pmid":"24796500","id":"PMC_24796500","title":"Spectrum of Cav1.4 dysfunction in congenital stationary night blindness type 2.","date":"2014","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/24796500","citation_count":25,"is_preprint":false},{"pmid":"27456671","id":"PMC_27456671","title":"Protein kinase A modulation of CaV1.4 calcium channels.","date":"2016","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/27456671","citation_count":23,"is_preprint":false},{"pmid":"10873387","id":"PMC_10873387","title":"Isolation and characterization of a calcium channel gene, Cacna1f, the murine orthologue of the gene for incomplete X-linked congenital stationary night blindness.","date":"2000","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/10873387","citation_count":23,"is_preprint":false},{"pmid":"12855715","id":"PMC_12855715","title":"Posttranslational processing of the xylanase Xys1L from Streptomyces halstedii JM8 is carried out by secreted serine proteases.","date":"2003","source":"Microbiology (Reading, England)","url":"https://pubmed.ncbi.nlm.nih.gov/12855715","citation_count":23,"is_preprint":false},{"pmid":"34212239","id":"PMC_34212239","title":"Cav1.4 dysfunction and congenital stationary night blindness type 2.","date":"2021","source":"Pflugers Archiv : European journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/34212239","citation_count":21,"is_preprint":false},{"pmid":"9182697","id":"PMC_9182697","title":"Two genes encoding an endoglucanase and a cellulose-binding protein are clustered and co-regulated by a TTA codon in Streptomyces halstedii JM8.","date":"1997","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/9182697","citation_count":21,"is_preprint":false},{"pmid":"12719097","id":"PMC_12719097","title":"A novel CACNA1F mutation in a french family with the incomplete type of X-linked congenital stationary night blindness.","date":"2003","source":"American journal of ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/12719097","citation_count":21,"is_preprint":false},{"pmid":"32313206","id":"PMC_32313206","title":"Using an integrative machine learning approach utilising homology modelling to clinically interpret genetic variants: CACNA1F as an exemplar.","date":"2020","source":"European journal of human genetics : EJHG","url":"https://pubmed.ncbi.nlm.nih.gov/32313206","citation_count":19,"is_preprint":false},{"pmid":"26274509","id":"PMC_26274509","title":"Gain-of-function nature of Cav1.4 L-type calcium channels alters firing properties of mouse retinal ganglion cells.","date":"2015","source":"Channels (Austin, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/26274509","citation_count":19,"is_preprint":false},{"pmid":"29179637","id":"PMC_29179637","title":"Cone dystrophy and ectopic synaptogenesis in a Cacna1f loss of function model of congenital stationary night blindness (CSNB2A).","date":"2018","source":"Channels (Austin, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/29179637","citation_count":16,"is_preprint":false},{"pmid":"15850758","id":"PMC_15850758","title":"Identification of the sequences involved in the glucose-repressed transcription of the Streptomyces halstedii JM8 xysA promoter.","date":"2005","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/15850758","citation_count":16,"is_preprint":false},{"pmid":"25258313","id":"PMC_25258313","title":"Structural insights into activation of the retinal L-type Ca²⁺ channel (Cav1.4) by Ca²⁺-binding protein 4 (CaBP4).","date":"2014","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/25258313","citation_count":15,"is_preprint":false},{"pmid":"7947789","id":"PMC_7947789","title":"Differential scanning calorimetric study of the thermal stability of xylanase from Streptomyces halstedii JM8.","date":"1994","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/7947789","citation_count":15,"is_preprint":false},{"pmid":"23425697","id":"PMC_23425697","title":"Visual signal pathway reorganization in the Cacna1f mutant rat model.","date":"2013","source":"Investigative ophthalmology & visual science","url":"https://pubmed.ncbi.nlm.nih.gov/23425697","citation_count":14,"is_preprint":false},{"pmid":"18246026","id":"PMC_18246026","title":"A naturally-occurring mutation in Cacna1f in a rat model of congenital stationary night blindness.","date":"2008","source":"Molecular vision","url":"https://pubmed.ncbi.nlm.nih.gov/18246026","citation_count":14,"is_preprint":false},{"pmid":"33668843","id":"PMC_33668843","title":"Optic Atrophy and Inner Retinal Thinning in CACNA1F-related Congenital Stationary Night Blindness.","date":"2021","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/33668843","citation_count":14,"is_preprint":false},{"pmid":"27270916","id":"PMC_27270916","title":"Cav1.4 L-Type Calcium Channels Contribute to Calpain Activation in Degenerating Photoreceptors of rd1 Mice.","date":"2016","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/27270916","citation_count":14,"is_preprint":false},{"pmid":"11722888","id":"PMC_11722888","title":"Construction of a xylanase-producing strain of Brevibacterium lactofermentum by stable integration of an engineered xysA gene from Streptomyces halstedii JM8.","date":"2001","source":"Applied and environmental microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/11722888","citation_count":13,"is_preprint":false},{"pmid":"33513752","id":"PMC_33513752","title":"A Novel Splice-Site Variant in CACNA1F Causes a Phenotype Synonymous with Åland Island Eye Disease and Incomplete Congenital Stationary Night Blindness.","date":"2021","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/33513752","citation_count":12,"is_preprint":false},{"pmid":"30445045","id":"PMC_30445045","title":"Photoreceptor degeneration in a new Cacna1f mutant mouse model.","date":"2018","source":"Experimental eye research","url":"https://pubmed.ncbi.nlm.nih.gov/30445045","citation_count":11,"is_preprint":false},{"pmid":"35697328","id":"PMC_35697328","title":"Two novel CACNA1F gene mutations cause two different phenotypes: Aland Eye Disease and incomplete Congenital Stationary Night Blindness.","date":"2022","source":"Experimental eye research","url":"https://pubmed.ncbi.nlm.nih.gov/35697328","citation_count":10,"is_preprint":false},{"pmid":"22735794","id":"PMC_22735794","title":"Mutation screening of TRPM1, GRM6, NYX and CACNA1F genes in patients with congenital stationary night blindness.","date":"2012","source":"International journal of molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/22735794","citation_count":10,"is_preprint":false},{"pmid":"1737358","id":"PMC_1737358","title":"Quantitative ultrastructural effects of cisplatin (Platinol), carboplatin (JM8), and iproplatin (JM9) on neurons of freshwater snail Lymnaea stagnalis.","date":"1992","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/1737358","citation_count":10,"is_preprint":false},{"pmid":"26075273","id":"PMC_26075273","title":"Identification of a novel heterozygous missense mutation in the CACNA1F gene in a chinese family with retinitis pigmentosa by next generation sequencing.","date":"2015","source":"BioMed research international","url":"https://pubmed.ncbi.nlm.nih.gov/26075273","citation_count":10,"is_preprint":false},{"pmid":"6380788","id":"PMC_6380788","title":"Cell survival in four ovarian carcinoma xenografts following in vitro exposure to melphalan, cisplatin and cis-diammine-1,1-cyclobutane dicarboxylate platinum II (CBDCA,JM8).","date":"1984","source":"Cancer chemotherapy and pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/6380788","citation_count":10,"is_preprint":false},{"pmid":"31651202","id":"PMC_31651202","title":"An Ashkenazi Jewish founder mutation in CACNA1F causes retinal phenotype in both hemizygous males and heterozygous female carriers.","date":"2019","source":"Ophthalmic genetics","url":"https://pubmed.ncbi.nlm.nih.gov/31651202","citation_count":10,"is_preprint":false},{"pmid":"31335952","id":"PMC_31335952","title":"Rescue of Rod Synapses by Induction of Cav Alpha 1F in the Mature Cav1.4 Knock-Out Mouse Retina.","date":"2019","source":"Investigative ophthalmology & visual science","url":"https://pubmed.ncbi.nlm.nih.gov/31335952","citation_count":10,"is_preprint":false},{"pmid":"30260717","id":"PMC_30260717","title":"Novel truncating mutation in CACNA1F in a young male patient diagnosed with optic atrophy.","date":"2018","source":"Ophthalmic genetics","url":"https://pubmed.ncbi.nlm.nih.gov/30260717","citation_count":9,"is_preprint":false},{"pmid":"22800190","id":"PMC_22800190","title":"Behavioral phenotypic properties of a natural occurring rat model of congenital stationary night blindness with Cacna1f mutation.","date":"2012","source":"Journal of neurogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/22800190","citation_count":9,"is_preprint":false},{"pmid":"2841723","id":"PMC_2841723","title":"Carboplatin (JM8), etoposide (VP16) and thoracic irradiation for small cell lung cancer (S.C.L.C.): an evaluation of lung toxicity.","date":"1988","source":"Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology","url":"https://pubmed.ncbi.nlm.nih.gov/2841723","citation_count":8,"is_preprint":false},{"pmid":"9252578","id":"PMC_9252578","title":"Effect of carbon source on the expression of celA1, a cellulase-encoding gene from Streptomyces halstedii JM8.","date":"1997","source":"FEMS microbiology letters","url":"https://pubmed.ncbi.nlm.nih.gov/9252578","citation_count":8,"is_preprint":false},{"pmid":"15522513","id":"PMC_15522513","title":"Single mutations of residues outside the active center of the xylanase Xys1 Delta from Streptomyces halstedii JM8 affect its activity.","date":"2004","source":"FEMS microbiology letters","url":"https://pubmed.ncbi.nlm.nih.gov/15522513","citation_count":8,"is_preprint":false},{"pmid":"33117610","id":"PMC_33117610","title":"Transgenic Expression of Cacna1f Rescues Vision and Retinal Morphology in a Mouse Model of Congenital Stationary Night Blindness 2A (CSNB2A).","date":"2020","source":"Translational vision science & technology","url":"https://pubmed.ncbi.nlm.nih.gov/33117610","citation_count":7,"is_preprint":false},{"pmid":"25748727","id":"PMC_25748727","title":"Cacna1f gene decreased contractility of skeletal muscle in rat model with congenital stationary night blindness.","date":"2015","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/25748727","citation_count":7,"is_preprint":false},{"pmid":"22422470","id":"PMC_22422470","title":"Comparison of male chimeric mice generated from microinjection of JM8.N4 embryonic stem cells into C57BL/6J and C57BL/6NTac blastocysts.","date":"2012","source":"Transgenic research","url":"https://pubmed.ncbi.nlm.nih.gov/22422470","citation_count":7,"is_preprint":false},{"pmid":"36165086","id":"PMC_36165086","title":"Identification of a novel CACNA1F mutation in a Chinese family with CORDX3.","date":"2022","source":"Molecular genetics & genomic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/36165086","citation_count":6,"is_preprint":false},{"pmid":"3044631","id":"PMC_3044631","title":"Urinary protein and enzyme excretion in patients receiving chemotherapy with the cis-platinum analogs carboplatin (CBDCA, JM8) and iproplatin (CHIP, JM9).","date":"1988","source":"Cancer chemotherapy and pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/3044631","citation_count":5,"is_preprint":false},{"pmid":"3034790","id":"PMC_3034790","title":"Comparative antitumour activity of cisplatin and two new cisplatin-analogues JM8 and JM9 in human testicular carcinoma xenografts.","date":"1987","source":"International journal of andrology","url":"https://pubmed.ncbi.nlm.nih.gov/3034790","citation_count":4,"is_preprint":false},{"pmid":"35947237","id":"PMC_35947237","title":"A clinical and electrophysiological case study of a child with a novel frame shift mutation in the CACNA1F and missense variation of RIMS1 genes.","date":"2022","source":"Documenta ophthalmologica. Advances in ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/35947237","citation_count":3,"is_preprint":false},{"pmid":"36191840","id":"PMC_36191840","title":"Assessing the Pathogenicity of In-Frame CACNA1F Indel Variants Using Structural Modeling.","date":"2022","source":"The Journal of molecular diagnostics : JMD","url":"https://pubmed.ncbi.nlm.nih.gov/36191840","citation_count":3,"is_preprint":false},{"pmid":"40390739","id":"PMC_40390739","title":"A New Phenotypic Expression in a Patient With a Mutation in the CACNA1F Gene.","date":"2025","source":"Cureus","url":"https://pubmed.ncbi.nlm.nih.gov/40390739","citation_count":2,"is_preprint":false},{"pmid":"38474172","id":"PMC_38474172","title":"Aland Island Eye Disease with Retinoschisis in the Clinical Spectrum of CACNA1F-Associated Retinopathy-A Case Report.","date":"2024","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/38474172","citation_count":2,"is_preprint":false},{"pmid":"36469668","id":"PMC_36469668","title":"Optic nerve involvement in CACNA1F-related disease: observations from a multicentric case series.","date":"2022","source":"Ophthalmic genetics","url":"https://pubmed.ncbi.nlm.nih.gov/36469668","citation_count":2,"is_preprint":false},{"pmid":"39858572","id":"PMC_39858572","title":"Novel Splice-Altering Variants in the CHM and CACNA1F Genes Causative of X-Linked Choroideremia and Cone Dystrophy.","date":"2024","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/39858572","citation_count":1,"is_preprint":false},{"pmid":"40400241","id":"PMC_40400241","title":"Ȧland Island eye disease in two patients harboring novel CACNA1F variants.","date":"2025","source":"Ophthalmic genetics","url":"https://pubmed.ncbi.nlm.nih.gov/40400241","citation_count":1,"is_preprint":false},{"pmid":"36943941","id":"PMC_36943941","title":"Characterization of two pathological gating-charge substitutions in Cav1.4 L-type calcium channels.","date":"2023","source":"Channels (Austin, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/36943941","citation_count":1,"is_preprint":false},{"pmid":"39652271","id":"PMC_39652271","title":"Novel CACNA1F pathogenic variant in pediatric incomplete X-linked CSNB: integrating portable ERG and genetic analysis.","date":"2024","source":"Documenta ophthalmologica. Advances in ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/39652271","citation_count":1,"is_preprint":false},{"pmid":"41381383","id":"PMC_41381383","title":"Identification of a Novel Splice-Site Variant in CACNA1F With Variable Phenotypic Expression in a Chinese Family.","date":"2025","source":"Molecular genetics & genomic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/41381383","citation_count":1,"is_preprint":false},{"pmid":"32680768","id":"PMC_32680768","title":"Diagnosis of an X-linked type 2 congenital stationary night blindness using electroretinography and CACNA1F sequencing.","date":"2020","source":"Archivos de la Sociedad Espanola de Oftalmologia","url":"https://pubmed.ncbi.nlm.nih.gov/32680768","citation_count":1,"is_preprint":false},{"pmid":"26436388","id":"PMC_26436388","title":"Establishment and rapid detection of a heterozygous missense mutation in the CACNA1F gene by ARMS technique with double-base mismatched primers.","date":"2015","source":"Genetics and molecular research : GMR","url":"https://pubmed.ncbi.nlm.nih.gov/26436388","citation_count":1,"is_preprint":false},{"pmid":"40129245","id":"PMC_40129245","title":"Exploring the potential for gene therapy in Cav1.4-related retinal channelopathies.","date":"2025","source":"Channels (Austin, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/40129245","citation_count":0,"is_preprint":false},{"pmid":"40744901","id":"PMC_40744901","title":"Novel structural variant in CACNA1F causing congenital stationary night blindness identified with whole genome sequencing.","date":"2025","source":"Ophthalmic genetics","url":"https://pubmed.ncbi.nlm.nih.gov/40744901","citation_count":0,"is_preprint":false},{"pmid":"40737315","id":"PMC_40737315","title":"Whole exome sequencing reveals pathogenic variants in CNGA3, CACNA1F, and RPGRIP1 in consanguineous Pakistani families with diverse retinal phenotypes.","date":"2025","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/40737315","citation_count":0,"is_preprint":false},{"pmid":"41489546","id":"PMC_41489546","title":"Inhibition of CaV1.4 channels by CaV3 channel antagonists ML218 and Z944.","date":"2026","source":"The Journal of general physiology","url":"https://pubmed.ncbi.nlm.nih.gov/41489546","citation_count":0,"is_preprint":false},{"pmid":"41882631","id":"PMC_41882631","title":"Deletion in CACNA1F gene causes X-linked progressive retinal atrophy in English Cocker Spaniel dogs.","date":"2026","source":"BMC veterinary research","url":"https://pubmed.ncbi.nlm.nih.gov/41882631","citation_count":0,"is_preprint":false},{"pmid":"41201761","id":"PMC_41201761","title":"Incomplete congenital stationary night blindness associated with a novel variant in the CACNA1F gene.","date":"2025","source":"Documenta ophthalmologica. Advances in ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/41201761","citation_count":0,"is_preprint":false},{"pmid":"38778612","id":"PMC_38778612","title":"A Mutation in the CACNA1F Gene Found by Whole Exome Sequencing (WES) and In Silico Analysis in an Iranian Family with Consanguineous Relationships.","date":"2025","source":"Current aging science","url":"https://pubmed.ncbi.nlm.nih.gov/38778612","citation_count":0,"is_preprint":false},{"pmid":"42074509","id":"PMC_42074509","title":"Mutation Screening of ARR3, CACNA1F, P4HA2, TRPM1, COL2A1, COL11A1 and PAX6 in a Chinese Cohort of 37 Patients with Early-Onset High Myopia.","date":"2026","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/42074509","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51170,"output_tokens":5990,"usd":0.12168,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14675,"output_tokens":6427,"usd":0.117025,"stage2_stop_reason":"end_turn"},"total_usd":0.238705,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2004,\n      \"finding\": \"CACNA1F encodes an L-type (dihydropyridine-sensitive) calcium channel (Cav1.4) with unusually slow voltage-dependent inactivation kinetics that are not affected by calcium ions or by coexpression of ancillary beta subunits; the channel supports a large window current and activates near -40 mV in 2 mM external calcium, making it suited for tonic calcium influx at photoreceptor resting potentials.\",\n      \"method\": \"Whole-cell patch clamp of transiently expressed human Cav1.4 in HEK cells; pharmacological profiling; introduction of CSNB2 missense mutations\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct electrophysiological reconstitution with mutagenesis in heterologous system, multiple biophysical parameters measured\",\n      \"pmids\": [\"14973233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Single Cav1.4 channels have an extremely low open probability (<0.015) and a unitary conductance of ~4 pS (compared to ~20 pS for Cav1.2), with brief but sustained openings throughout depolarization accounting for the slow whole-cell inactivation; BayK8644 increases open time constant ~45% without introducing an additional gating mode.\",\n      \"method\": \"Cell-attached patch single-channel recordings in tsA-201 cells with 100 mM barium as charge carrier; kinetic analysis; comparison to Cav1.2\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — single-channel reconstitution with rigorous biophysical analysis, single lab but multiple orthogonal parameters\",\n      \"pmids\": [\"16085774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CaBP4 directly associates with the C-terminal domain of the Cav1.4 alpha1-subunit and shifts the activation of Cav1.4 to hyperpolarized voltages in transfected cells; CaBP4 is specifically expressed in photoreceptor synaptic terminals and its loss phenocopies CSNB2.\",\n      \"method\": \"Co-immunoprecipitation / direct binding assay with Cav1.4 C-terminal domain; electrophysiology in transfected cells; Cabp4 knockout mouse with ERG and immunocytochemistry\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding assay + functional electrophysiology + in vivo KO phenotype, replicated across methods\",\n      \"pmids\": [\"15452577\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CaBP4 increases Cav1.4 channel availability by interacting with the IQ motif of Cav1.4 and relieving the inhibitory effects of the C-terminal ICDI (inhibitor of Ca2+-dependent inactivation) domain on voltage-dependent gating; this effect requires the ICDI domain and is absent in an ICDI-deletion mutant. Disease-associated CaBP4 mutants interact with Cav1.4 but show reduced functional effects, leading to loss of channel availability.\",\n      \"method\": \"Whole-cell patch clamp of heterologously expressed Cav1.4; FRET experiments with fluorescent-protein-tagged constructs; site-directed mutagenesis of ICDI domain\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — FRET binding assay + patch clamp + mutagenesis, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"22936811\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Calmodulin is pre-associated with the C-terminus of Cav1.4 (shown by FRET) and increases current density and slows voltage-dependent inactivation; the ICDI domain selectively abolishes Ca2+-dependent inactivation without displacing calmodulin or interfering with other calmodulin effects.\",\n      \"method\": \"FRET with cyan fluorescent protein variants; whole-cell patch clamp; ICDI deletion constructs\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — FRET binding assay + electrophysiology + domain deletion, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"19717559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NMR structures of CaBP4 in Mg2+- and Ca2+-bound states show that Ca2+-bound CaBP4 exposes residues (Phe137, Glu168, Leu207, Phe214, Met251, Phe264, Leu268) that contact the IQ motif in Cav1.4; the Cav1.4 mutant Y1595E strongly impairs CaBP4 binding, supporting a model in which CaBP4 forms a collapsed structure around the IQ motif to promote channel activation.\",\n      \"method\": \"NMR structure determination; mutational analysis of Cav1.4 IQ motif (Y1595E) with binding assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure plus mutagenesis-validated binding interface, single lab but rigorous structural plus functional validation\",\n      \"pmids\": [\"25258313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Native retinal Cav1.4 channel complexes comprise the Cav1.4 alpha1 subunit, beta2 (including a novel variant beta2X13), and alpha2delta4; co-immunoprecipitation from transfected HEK293 cells and mouse retina confirmed these interactions. Alpha2delta4 confers weaker voltage-dependent activation than alpha2delta1; beta2X13 (vs. beta2a) produces greater voltage-dependent inactivation specifically in Cav1.4 but not Cav1.2.\",\n      \"method\": \"Co-immunoprecipitation from HEK293 cells and mouse retina; proximity ligation assays in retina; whole-cell patch clamp of defined subunit combinations\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP from native tissue + reconstitution electrophysiology, multiple orthogonal methods\",\n      \"pmids\": [\"25468907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Exon 47 of CACNA1F encodes part of the C-terminal automodulatory domain (CTM) that suppresses Ca2+-dependent inactivation (CDI) and causes a positive shift in voltage-dependent activation; splice variants lacking exon 47 show intense CDI and activate at more hyperpolarized voltages. CaBP4 suppresses CDI of exon-47-lacking variants but does not shift their voltage-dependent activation, indicating exon 47 is necessary for CaBP4-mediated modulation of activation.\",\n      \"method\": \"Electrophysiology (whole-cell patch clamp) of splice variant constructs expressed in HEK cells; CaBP4 co-expression; RT-PCR of human/primate retina\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution electrophysiology with defined splice variants plus CaBP4 co-expression, multiple parameters measured\",\n      \"pmids\": [\"27226626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PKA phosphorylation of the ICDI motif of Cav1.4 increases calmodulin occupancy on the channel, thereby increasing channel open probability and enabling Ca2+-dependent inactivation; introduction of the Cav1.4 ICDI into Cav1.3 or Cav1.2 transfers this PKA-modulation mechanism.\",\n      \"method\": \"Whole-cell patch clamp; PKA activation/inhibition; calmodulin FRET binding assay; domain swap experiments between Cav subtypes\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — electrophysiology + FRET + domain swaps, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"27456671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"A missense mutation I745T in transmembrane segment IIS6 of CACNA1F causes a ~-30 mV shift in the voltage dependence of Cav1.4 channel activation (gain-of-function) and significantly slower inactivation kinetics, demonstrating that altered gating underlies this CSNB2-variant retinal disorder.\",\n      \"method\": \"Heterologous expression in Xenopus oocytes or mammalian cells; whole-cell patch clamp; voltage-clamp analysis of gating\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — electrophysiological reconstitution of disease mutation, validated in expression system, replicated in subsequent mouse model study\",\n      \"pmids\": [\"15897456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Cacna1f knockout mice show 90% less peak calcium signal at photoreceptor synapses (by Fluo-4 calcium imaging), absence of post-receptoral ERG b-wave, profound loss of photoreceptor ribbon synapses, and abnormal dendritic sprouting of bipolar and horizontal cells into the outer nuclear layer, establishing Cav1.4 as essential for functional assembly and maintenance of photoreceptor ribbon synapses.\",\n      \"method\": \"Targeted Cacna1f knockout mouse (Cre-lox insertion in exon 7); ERG; calcium imaging in retinal slices; immunocytochemistry\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with multiple defined cellular phenotypes + calcium imaging + ERG, replicated across multiple subsequent studies\",\n      \"pmids\": [\"16155113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Active-zone proteins RIM1 and RIM2 potently enhance Ca2+ influx through Cav1.4 channels in rod photoreceptor terminals; conditional double knockout of RIM1/2 from rods causes profound reduction in Ca2+ currents and ~4-fold reduction in spontaneous miniature release, and near-complete absence of evoked vesicle release, without altering Cav1.4 protein expression or localization at ribbons.\",\n      \"method\": \"Conditional double knockout of RIM1/2 in rods; whole-cell voltage clamp of isolated rods; membrane capacitance measurements; immunocytochemistry\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean conditional KO with electrophysiology + exocytosis assay + immunocytochemistry, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"26400943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Synaptic ribbons are required to stabilize Cav1.4/RIM2 clusters at rod photoreceptor active zones and are necessary for darkness-induced enrichment of Cav1.4/RIM2 at active zones; ribbon length and Cav1.4/RIM2 cluster length are tightly correlated, and both increase during dark adaptation.\",\n      \"method\": \"RIBEYE knockout mice (ribbon-deficient); immunofluorescence quantification of Cav1.4/RIM2 cluster length; dark/light adaptation paradigms\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO model with quantitative immunofluorescence, single lab, morphological endpoint without electrophysiological validation\",\n      \"pmids\": [\"32249787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CSNB2 missense mutations G1007R and R1049W produce full-length Cav1.4 protein that targets to the membrane but supports no ionic current (loss-of-function); mutation F742C (S6 domain II) produces a ~21 mV hyperpolarizing shift in activation and inactivation (gain-of-function) with slower inactivation kinetics.\",\n      \"method\": \"Whole-cell patch clamp of mutant Cav1.4 transiently expressed in HEK tsA-201 cells; Western blot for protein expression\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — electrophysiological reconstitution with multiple disease mutations, single lab with functional and biochemical methods\",\n      \"pmids\": [\"17949918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CSNB2 missense mutations R508Q and L1364H alter Cav1.4 protein expression density rather than channel gating; both mutations affect total alpha1 protein expression in a temperature-dependent manner in mammalian cells, providing a distinct pathological mechanism from gating alterations.\",\n      \"method\": \"Heterologous expression in Xenopus oocytes and tsA-201 cells; whole-cell patch clamp; Western blot for protein levels; temperature-dependent experiments\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution electrophysiology + protein quantification + temperature dependence, single lab, multiple methods\",\n      \"pmids\": [\"16476079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CSNB2 mutation L860P causes loss-of-function via reduced number of functional channels at the plasma membrane (confirmed by gating current and non-stationary noise analyses) associated with increased protein turnover; C-terminal truncation R1827X causes apparent gain-of-function (hyperpolarizing shift of IV-curve, increased single-channel activity) but also unmasks Ca2+-dependent inactivation by removing the C-terminal modulatory domain, thereby failing to support continuous Ca2+ influx.\",\n      \"method\": \"Whole-cell and single-channel patch clamp; gating current measurements; non-stationary noise analysis; protein turnover assays\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — single-channel + gating current + noise analysis + turnover in single rigorous study\",\n      \"pmids\": [\"24796500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Increasing temperature from 23°C to 37°C shifts Cav1.4 window current to more hyperpolarized voltages and accelerates inactivation ~50-fold (Q10=18.8), compared to only ~10-fold for Cav1.2, yet the window current is preserved at near-physiological temperatures, supporting tonic glutamate release from photoreceptors.\",\n      \"method\": \"Whole-cell patch clamp of human Cav1.4 cDNA at varying temperatures (23–37°C); comparison with Cav1.2\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — rigorous electrophysiology, single lab, single method\",\n      \"pmids\": [\"18206315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The nob2 mouse Cav1.4 alternatively spliced N-terminus (from ETn insertion) fails to interact with cytoskeletal filamin proteins in a pulldown assay, whereas wild-type Cav1.4 N-terminus does interact with filamins, identifying an N-terminal filamin-binding function of Cav1.4.\",\n      \"method\": \"Biochemical pulldown assay; cloning and sequencing of alternatively spliced mRNA; Western blot; electrophysiology\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct pulldown with defined domain, single lab, single binding assay method\",\n      \"pmids\": [\"18596967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Introduction of Cav alpha1F by in vivo electroporation into Cav1.4 knockout rod terminals rescues synaptic development markers (PSD-95 expression, elongated ribbons) even in adult animals; induced expression in mature rods also rescues ribbon formation but yields diffuse rather than clustered channel distribution, demonstrating that Cav1.4 expression is necessary and sufficient for rod synaptic terminal development and that this plasticity persists in adult retina.\",\n      \"method\": \"In vivo electroporation of Cav alpha1F into KO rods; tamoxifen-inducible expression system; immunohistochemistry for PSD-95 and ribbon markers; vision-guided water maze\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — rescue experiment in KO with morphological and behavioral readouts, single lab\",\n      \"pmids\": [\"31335952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In the Cav1.4-IT gain-of-function mouse retina, altered Cav1.4 activity leads to loss of contrast enhancement, reduced spatial response, changes in contrast sensitivity of ganglion cells, photoreceptor degeneration (nodular cone axons, enlarged pedicles), and reduced expression of mGluR6 and Connexin 36; plasma-membrane calcium ATPase 1 expression pattern is changed, suggesting a compensatory calcium homeostasis mechanism.\",\n      \"method\": \"Multielectrode array recordings from whole-mounted retinas; immunohistochemistry; optokinetic response testing\",\n      \"journal\": \"Channels (Austin, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional retinal recordings + morphology in defined gain-of-function mouse model, single lab\",\n      \"pmids\": [\"26274509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Genetic deletion of Cav1.4 (Cacna1f) in rd1 mice reduces calpain activation during photoreceptor degeneration and provides short-term preservation of photoreceptors, establishing Cav1.4-mediated Ca2+ influx as a contributor to calpain-dependent photoreceptor cell death.\",\n      \"method\": \"Cacna1f x rd1 double mutant mouse; optical coherence tomography; TUNEL assay; calpain activity measurement\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — double KO with defined molecular readout (calpain activation), single lab\",\n      \"pmids\": [\"27270916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Gating charge neutralization mutations R964G and R1288L in Cav1.4 voltage sensor S4 segments reduce channel expression and ON gating currents; R1288L additionally reduces single-channel current amplitude; molecular dynamics simulations indicate R1288L creates water wires in both resting and active states, suggesting pathological omega (ω) currents as a disease mechanism.\",\n      \"method\": \"Whole-cell and single-channel patch clamp; gating current measurements; molecular dynamics simulations\",\n      \"journal\": \"Channels (Austin, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — electrophysiology with gating currents + MD simulation, single lab; MD simulation supports but does not directly demonstrate omega currents\",\n      \"pmids\": [\"36943941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"The CaV3 channel antagonists ML218 and Z944 inhibit Cav1.4 channels (IC50 ~2 µM and ~30 µM respectively); structure-based modeling and mutagenesis identified methionine M1004 within the DHP-binding site as critical for ML218 potency, with M1004 mutation having a 10-fold greater impact than the conserved threonine T1007 required for DHP sensitivity.\",\n      \"method\": \"Whole-cell patch clamp of HEK293T cells transfected with Cav1.4 + beta2x13 + alpha2delta-4; structure-based homology modeling; M1004 and T1007 mutagenesis\",\n      \"journal\": \"The Journal of general physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — electrophysiology with mutagenesis + structural modeling identifying specific binding site residue, single lab, multiple methods\",\n      \"pmids\": [\"41489546\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CACNA1F encodes Cav1.4, a retinal L-type voltage-gated calcium channel with uniquely slow inactivation (due to a C-terminal ICDI domain that suppresses Ca2+-dependent inactivation by binding the IQ motif and tethering calmodulin), very low open probability (~4 pS unitary conductance), and a large window current near photoreceptor resting potential that sustains tonic glutamate release at ribbon synapses; its activity is regulated by CaBP4 (which binds the IQ motif and relieves ICDI-mediated inhibition), by PKA phosphorylation of the ICDI domain (promoting calmodulin occupancy and Ca2+-dependent inactivation), by auxiliary subunits beta2 and alpha2delta4, and by active-zone scaffold proteins RIM1/2 (which enhance Ca2+ influx without affecting channel localization); Cav1.4 also serves as a structural organizer of photoreceptor ribbon synapses whose assembly and maintenance require Cav1.4 expression, and disease mutations in CACNA1F cause a spectrum of Cav1.4 dysfunction ranging from loss-of-function (absent currents, reduced protein expression, misfolding) to gain-of-function (hyperpolarizing shifts in activation) that underlie X-linked congenital stationary night blindness type 2 and related retinal channelopathies.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CACNA1F encodes Cav1.4, an L-type voltage-gated calcium channel specialized for tonic calcium influx at photoreceptor ribbon synapses [#0]. Its defining biophysical signature is unusually slow voltage-dependent inactivation that is insensitive to calcium and to beta subunits, together with activation near -40 mV that generates a large window current poised to operate at photoreceptor resting potentials [#0]; single channels display very low open probability and a small (~4 pS) unitary conductance with sustained brief openings that account for the slow macroscopic inactivation [#1], and the window current is preserved at physiological temperature to support continuous transmitter release [#16]. The slow inactivation arises from a C-terminal automodulatory/ICDI domain (encoded in part by exon 47) that suppresses Ca2+-dependent inactivation without displacing pre-associated calmodulin, while also producing a depolarizing shift in activation [#4, #7]. This autoinhibition is relieved by CaBP4, which binds the IQ motif, shifts activation to hyperpolarized voltages and increases channel availability in an ICDI-dependent manner, with the Ca2+-bound CaBP4 structure collapsing around the IQ motif (Cav1.4 Y1595 critical) [#2, #3, #5]; PKA phosphorylation of the ICDI domain provides a second layer of regulation by increasing calmodulin occupancy and restoring Ca2+-dependent inactivation [#8]. Native channels assemble with auxiliary beta2 (including the beta2X13 variant) and alpha2delta4 subunits, and active-zone scaffolds RIM1/2 enhance Ca2+ influx and evoked vesicle release without changing channel localization [#6, #11]. Beyond its conductance role, Cav1.4 is a structural organizer of photoreceptor ribbon synapses: its loss abolishes the ERG b-wave, eliminates ribbon synapses and causes aberrant bipolar/horizontal cell sprouting, and re-introduction of Cav1.4 is necessary and sufficient to rescue synaptic development even in adult retina, with ribbons reciprocally stabilizing Cav1.4/RIM2 clusters [#10, #12, #18]. CACNA1F mutations cause X-linked congenital stationary night blindness type 2, acting through a spectrum of loss-of-function (absent current despite membrane targeting, reduced or temperature-dependent expression, increased turnover, gating-charge neutralization) and gain-of-function (hyperpolarizing activation shifts) mechanisms [#9, #13, #14, #15, #21].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established the defining biophysical identity of Cav1.4 as an L-type channel with calcium- and beta-independent slow inactivation and a large window current suited to photoreceptor resting potentials, explaining how a calcium channel could support tonic signaling.\",\n      \"evidence\": \"Whole-cell patch clamp of heterologously expressed human Cav1.4 with CSNB2 mutations in HEK cells\",\n      \"pmids\": [\"14973233\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the molecular basis of slow inactivation\", \"Native subunit composition not addressed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified CaBP4 as a direct C-terminal binding partner that hyperpolarizes Cav1.4 activation and whose loss phenocopies CSNB2, linking channel modulation to disease.\",\n      \"evidence\": \"Co-IP/binding assay, electrophysiology in transfected cells, and Cabp4 knockout mouse ERG/immunocytochemistry\",\n      \"pmids\": [\"15452577\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding site on Cav1.4 not yet mapped\", \"Mechanism relative to autoinhibition unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Resolved the single-channel basis of slow macroscopic inactivation, showing very low open probability and small unitary conductance with sustained brief openings.\",\n      \"evidence\": \"Cell-attached single-channel recordings in tsA-201 cells with barium and kinetic analysis\",\n      \"pmids\": [\"16085774\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural determinant of low conductance not identified\", \"Native-tissue confirmation absent\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrated in vivo that Cav1.4 is essential for assembly and maintenance of photoreceptor ribbon synapses, not merely for synaptic calcium signaling, by showing ribbon loss and aberrant neurite sprouting in knockouts.\",\n      \"evidence\": \"Targeted Cacna1f knockout mouse with ERG, calcium imaging in retinal slices, and immunocytochemistry\",\n      \"pmids\": [\"16155113\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the structural role requires channel conductance was not separated from expression\", \"Molecular pathway from channel to ribbon assembly unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined gain-of-function as one disease mechanism by showing a CSNB2 mutation that hyperpolarizes activation and slows inactivation.\",\n      \"evidence\": \"Heterologous expression and whole-cell/voltage-clamp gating analysis of I745T\",\n      \"pmids\": [\"15897456\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo consequence of the gating shift not tested here\", \"Did not address other mutation classes\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Revealed a distinct disease mechanism in which mutations alter channel protein expression density rather than gating, in a temperature-dependent manner.\",\n      \"evidence\": \"Heterologous expression in oocytes and tsA-201 cells with patch clamp, Western blot, and temperature-dependent assays of R508Q/L1364H\",\n      \"pmids\": [\"16476079\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trafficking/folding pathway affected not defined\", \"Relevance to native photoreceptor expression untested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Broadened the mutational spectrum by showing membrane-targeted but current-null loss-of-function and gating-shift gain-of-function alleles can coexist in CSNB2.\",\n      \"evidence\": \"Whole-cell patch clamp and Western blot of G1007R, R1049W and F742C in HEK tsA-201 cells\",\n      \"pmids\": [\"17949918\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why membrane-resident mutants conduct no current is unexplained\", \"No structural model of affected residues\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed that temperature strongly tunes Cav1.4 gating yet preserves the window current near physiological temperature, reconciling biophysics with tonic photoreceptor release.\",\n      \"evidence\": \"Whole-cell patch clamp of human Cav1.4 across 23-37C compared to Cav1.2\",\n      \"pmids\": [\"18206315\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single method, single lab\", \"No native-tissue validation of preserved window current\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified an N-terminal filamin-binding function lost in the nob2 splice variant, hinting at a cytoskeletal anchoring role for Cav1.4.\",\n      \"evidence\": \"Biochemical pulldown of wild-type vs spliced N-terminus with filamins plus cloning and electrophysiology\",\n      \"pmids\": [\"18596967\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single binding assay without reciprocal validation\", \"Functional consequence of filamin binding in vivo not established\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Pinpointed the C-terminal ICDI domain as the element that abolishes Ca2+-dependent inactivation without displacing pre-associated calmodulin, mechanistically explaining slow inactivation.\",\n      \"evidence\": \"FRET, whole-cell patch clamp, and ICDI deletion constructs\",\n      \"pmids\": [\"19717559\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic structure of the ICDI-CaM-IQ interaction not resolved\", \"Regulation of ICDI engagement not addressed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed mechanistically that CaBP4 increases channel availability by binding the IQ motif and relieving ICDI-mediated inhibition, and that disease CaBP4 mutants bind but fail to relieve it.\",\n      \"evidence\": \"Whole-cell patch clamp, FRET, and ICDI-deletion mutagenesis in heterologous cells\",\n      \"pmids\": [\"22936811\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of CaBP4-IQ engagement not yet defined\", \"Native-tissue stoichiometry unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Provided the structural model of CaBP4-Cav1.4 engagement, showing Ca2+-bound CaBP4 collapses around the IQ motif via defined contact residues and that Cav1.4 Y1595 is required.\",\n      \"evidence\": \"NMR structures of CaBP4 in Mg2+/Ca2+ states with IQ-motif Y1595E mutagenesis binding assay\",\n      \"pmids\": [\"25258313\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No full-length channel-CaBP4 complex structure\", \"Dynamics of CaM/CaBP4 exchange not resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined the native retinal channel as a Cav1.4/beta2(beta2X13)/alpha2delta4 complex and showed these specific auxiliary subunits tune activation and inactivation.\",\n      \"evidence\": \"Co-IP from HEK293 and mouse retina, proximity ligation assays, and patch clamp of defined subunit combinations\",\n      \"pmids\": [\"25468907\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of native complex not quantified\", \"How subunits influence the structural synaptic role untested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Distinguished mechanistically distinct disease alleles, including reduced surface channel number with increased turnover and a C-terminal truncation that gains function biophysically but loses tonic Ca2+ influx by unmasking CDI.\",\n      \"evidence\": \"Whole-cell/single-channel patch clamp, gating current, noise analysis, and turnover assays of L860P and R1827X\",\n      \"pmids\": [\"24796500\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo synaptic consequences not tested\", \"Trafficking machinery responsible for turnover unidentified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established RIM1/2 as active-zone regulators that potently enhance Cav1.4 Ca2+ influx and are required for evoked vesicle release without affecting channel localization.\",\n      \"evidence\": \"Conditional RIM1/2 double knockout in rods with voltage clamp, capacitance measurements, and immunocytochemistry\",\n      \"pmids\": [\"26400943\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct physical RIM-Cav1.4 interaction interface not mapped here\", \"Mechanism of current enhancement vs release coupling not separated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Mapped exon 47 to the C-terminal automodulatory domain, showing it suppresses CDI, shifts activation positive, and is required for CaBP4-mediated modulation of activation.\",\n      \"evidence\": \"Patch clamp of splice-variant constructs with CaBP4 co-expression and retinal RT-PCR\",\n      \"pmids\": [\"27226626\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative abundance of splice variants in vivo not quantified\", \"Regulation of splicing unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified PKA phosphorylation of the ICDI domain as a regulatory switch that increases CaM occupancy and restores Ca2+-dependent inactivation, transferable to other Cav1 subtypes.\",\n      \"evidence\": \"Patch clamp with PKA modulation, CaM FRET, and ICDI domain-swap experiments\",\n      \"pmids\": [\"27456671\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphorylation site(s) not pinpointed\", \"Physiological signaling context in photoreceptors untested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed in a gain-of-function mouse that altered Cav1.4 activity disrupts retinal circuit function, causes photoreceptor degeneration, and changes synaptic marker expression with compensatory calcium-handling changes.\",\n      \"evidence\": \"Multielectrode array recordings, immunohistochemistry, and optokinetic testing in Cav1.4-IT mice\",\n      \"pmids\": [\"26274509\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal chain from gating shift to degeneration not dissected\", \"Single model, single lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Implicated Cav1.4-mediated Ca2+ influx as a contributor to calpain-dependent photoreceptor death by showing its deletion reduces calpain activation in degenerating retina.\",\n      \"evidence\": \"Cacna1f x rd1 double-mutant mouse with OCT, TUNEL, and calpain activity assays\",\n      \"pmids\": [\"27270916\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Only short-term preservation shown\", \"Generalizability beyond rd1 degeneration unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated that Cav1.4 expression is necessary and sufficient for rod synaptic terminal development with persisting plasticity in adult retina, though clustered localization requires developmental context.\",\n      \"evidence\": \"In vivo electroporation and tamoxifen-inducible re-expression in KO rods with immunohistochemistry and behavioral testing\",\n      \"pmids\": [\"31335952\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Why mature induction yields diffuse rather than clustered channels unexplained\", \"Functional restoration of vision incompletely characterized\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed reciprocity in synaptic organization: ribbons stabilize and dark-adaptation enriches Cav1.4/RIM2 clusters at active zones.\",\n      \"evidence\": \"RIBEYE knockout mice with quantitative immunofluorescence and dark/light adaptation paradigms\",\n      \"pmids\": [\"32249787\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Morphological endpoint without electrophysiological validation\", \"Molecular mechanism of ribbon-dependent stabilization unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Proposed gating-charge neutralization as a disease mechanism in which voltage-sensor mutations reduce expression and gating currents and may generate pathological omega currents.\",\n      \"evidence\": \"Whole-cell/single-channel patch clamp, gating currents, and molecular dynamics simulations of R964G and R1288L\",\n      \"pmids\": [\"36943941\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Omega currents inferred from simulation, not directly measured\", \"In vivo consequence untested\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Identified Cav3 antagonists as Cav1.4 inhibitors and mapped a DHP-site residue (M1004) critical for ML218 potency, providing pharmacological tools and binding-site insight.\",\n      \"evidence\": \"Patch clamp of Cav1.4/beta2x13/alpha2delta4 in HEK293T cells with structure-based modeling and M1004/T1007 mutagenesis\",\n      \"pmids\": [\"41489546\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Therapeutic relevance in retina not tested\", \"No experimental structure of the drug-bound channel\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How Cav1.4 expression mechanistically drives ribbon synapse assembly — and whether this structural role is separable from ion conduction — remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular pathway linking Cav1.4 to ribbon scaffold assembly\", \"Conduction-independent structural role not directly tested\", \"No atomic-resolution structure of the native channel complex\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 1, 16]},\n      {\"term_id\": \"GO:0005216\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 9]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [10, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [13, 15]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [10, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 8]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [9, 13, 14, 15]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"complexes\": [\"Cav1.4/beta2/alpha2delta4 channel complex\", \"photoreceptor ribbon synapse active zone\"],\n    \"partners\": [\"CABP4\", \"CALM1\", \"RIM1\", \"RIM2\", \"CACNB2\", \"CACNA2D4\", \"FLNA\", \"RIBEYE\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}