{"gene":"KCNK3","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":2002,"finding":"p11 (an annexin II subunit) interacts specifically with TASK-1 (KCNK3) via the last three C-terminal amino acids (Ser-Ser-Val), and this association is essential for trafficking of TASK-1 to the plasma membrane by masking an ER retention signal (Lys-Arg-Arg) that precedes the SSV sequence.","method":"Co-immunoprecipitation, C-terminal deletion mutants, TASK-1-GFP chimeras, heterologous expression","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1/2 — multiple orthogonal methods (pulldown, mutagenesis, GFP trafficking) in single rigorous study","pmids":["12198146"],"is_preprint":false},{"year":2001,"finding":"TASK-1 (KCNK3) is inhibited by Gq-coupled receptor activation via a phospholipase C (PLC)-dependent mechanism; downstream signals IP3, Ca2+, and DAG do not individually mediate inhibition, and Gi-coupled receptors only inhibit TASK-1 when PLC-β2 is co-expressed, establishing PLC activity as the critical step.","method":"Two-electrode voltage clamp in Xenopus oocytes with heterologous receptor expression, GTPγS application, PLC inhibitor U-73122, receptor subtype dissection","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with pharmacological dissection across multiple receptor systems, replicated across GPCR types","pmids":["11443069"],"is_preprint":false},{"year":2003,"finding":"TASK-1 mediates the noninactivating background K+ current (IKN) that sets the resting membrane potential in rabbit pulmonary artery smooth muscle cells; the current is inhibited by extracellular acidosis, Zn2+, anandamide, hypoxia, and enhanced by halothane, pharmacologically matching TASK-1 properties.","method":"Whole-cell patch clamp, RT-PCR, immunodetection in native PASMCs","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 — multiple pharmacological and molecular identification methods in native cells, replicated in similar studies","pmids":["14551239"],"is_preprint":false},{"year":2006,"finding":"TASK-1 (KCNK3) controls resting membrane potential in human PASMCs; it is inhibited by hypoxia and activated by treprostinil through PKA-dependent phosphorylation; TASK-1 siRNA knockdown abolishes sensitivity to anandamide, acidosis, alkalosis, hypoxia, and treprostinil.","method":"Whole-cell patch clamp, siRNA knockdown, pharmacological dissection in primary human PASMCs","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 — siRNA knockdown with defined electrophysiological phenotype plus PKA pathway identification, multiple orthogonal methods","pmids":["16574908"],"is_preprint":false},{"year":2007,"finding":"Forward transport of KCNK3 (K2P3.1) to the plasma membrane requires 14-3-3-mediated suppression of COPI binding at two separate N- and C-terminal sites; p11 binding to the C-terminal retention motif is dependent on prior 14-3-3 binding and serves a modulatory role in a subset of tissues.","method":"Pulldown, co-immunoprecipitation, deletion mutants, heterologous expression trafficking assays","journal":"Traffic (Copenhagen, Denmark)","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (Co-IP, mutational analysis, trafficking assays) in single study with rigorous controls","pmids":["17908283"],"is_preprint":false},{"year":2009,"finding":"TASK-1/TASK-3 heterodimeric channels constitute the major oxygen-sensitive background K+ conductance in rat carotid body glomus cells; single-channel conductance (~42 pS) and pharmacological profile (ruthenium red insensitivity, methanandamide sensitivity) distinguish heteromers from homodimers, and heterodimers are inhibited by hypoxia.","method":"Single-channel patch clamp (cell-attached and outside-out), manipulation of extracellular Mg2+, pharmacological profiling in native carotid body cells","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 1/2 — detailed single-channel biophysics combined with pharmacological dissection in native cells","pmids":["19403596"],"is_preprint":false},{"year":2002,"finding":"Histidine residue H98 (and to a lesser extent H72 and K210) in TASK-1 contributes to extracellular pH sensing; mutating H98 significantly shifts the K_d for H+ block, though additional residues/domains also contribute to pH sensitivity.","method":"Site-directed mutagenesis, two-electrode voltage clamp in Xenopus oocytes","journal":"Pflugers Archiv : European journal of physiology","confidence":"High","confidence_rationale":"Tier 1 — in vitro mutagenesis with quantitative functional assay","pmids":["12634929"],"is_preprint":false},{"year":2002,"finding":"TASK-1 mediates a standing outward K+ current in rat cerebellar granule neurons that sets resting membrane potential; hypoxia inhibits this TASK-1-mediated current causing neuronal depolarization, demonstrated by occlusion with pH 6.4 acidosis and anandamide.","method":"Whole-cell patch clamp in primary cerebellar granule neurons, pharmacological occlusion experiments","journal":"Stroke","confidence":"High","confidence_rationale":"Tier 2 — pharmacological occlusion with two independent TASK-1 inhibitors in native neurons","pmids":["12215606"],"is_preprint":false},{"year":2009,"finding":"Endothelin-1 inhibits TASK-1 background K+ current in primary human PASMCs via ETA receptors coupled to phospholipase C, phosphatidylinositol 4,5-bisphosphate hydrolysis, diacylglycerol generation, and protein kinase C phosphorylation of TASK-1, causing membrane depolarization; TASK-1 siRNA abolishes ET-1 effect on membrane potential.","method":"Whole-cell patch clamp, siRNA knockdown, pharmacological inhibitors of ETA, PLC, PI(4,5)P2, DAG, PKC in primary hPASMCs","journal":"American journal of respiratory cell and molecular biology","confidence":"High","confidence_rationale":"Tier 2 — siRNA validation plus complete pathway pharmacological dissection with orthogonal methods","pmids":["19188660"],"is_preprint":false},{"year":2014,"finding":"TASK-1 and TASK-3 channels are gated by diacylglycerol (DAG) downstream of Gαq/11-coupled GPCRs; receptor-initiated inhibition requires PLC activity and elevation of cellular DAG, but not PI(4,5)P2 depletion, IP3, or Ca2+ release; DAG kinase or lipase suppression of DAG transients blocks channel inhibition.","method":"Electrophysiology, DAG kinase/lipase manipulation, PI(4,5)P2 sensors, fluorescent DAG reporters, pharmacological dissection in heterologous cells","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1/2 — multiple orthogonal methods definitively ruling out alternative second messengers and identifying DAG as the direct signal","pmids":["25420509"],"is_preprint":false},{"year":2012,"finding":"Endothelin-1 inhibits TASK-1 current (ITASK) in rat cardiomyocytes via endothelin-A receptors and is mediated by PLC; inhibition is not affected by PKC or rho kinase inhibitors; TASK-1 inhibition by ET-1 prolongs action potential duration in cardiomyocytes.","method":"Whole-cell patch clamp in isolated rat cardiomyocytes, pharmacological inhibitors (U73122, PKC inhibitors, rho kinase inhibitors), TIRFM PI(4,5)P2 measurements","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods identifying PLC as the relevant signaling mediator in native cardiomyocytes","pmids":["22977011"],"is_preprint":false},{"year":2012,"finding":"PKC-mediated endocytic trafficking dynamically regulates KCNK3 surface expression and activity; phorbol ester or group I mGluR activation acutely internalizes KCNK3 in a 14-3-3β-dependent manner requiring a novel endocytic motif on KCNK3; depletion of 14-3-3β or ablation of the endocytic motif abrogates PKC-regulated trafficking.","method":"Electrophysiology, surface biotinylation, siRNA depletion, endocytic motif mutagenesis in cerebellar granule neurons and cell lines","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (electrophysiology, surface expression, mutagenesis) in native neurons and cell lines","pmids":["22846993"],"is_preprint":false},{"year":2020,"finding":"TASK-1 (KCNK3) contains a lower gate (the 'X-gate') formed by the crossing of C-terminal M4 transmembrane helices (residues 243VLRFMT248); this gate controls channel open probability and responses to volatile anaesthetics and GPCRs; X-gate mutations affect gating, and high-affinity inhibitors bind below the selectivity filter and are trapped by the X-gate explaining slow washout.","method":"X-ray crystallography, mutagenesis, electrophysiology, inhibitor co-crystallization","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — X-ray crystal structure with functional mutagenesis and inhibitor co-crystal structures, multiple orthogonal validations","pmids":["32499642"],"is_preprint":false},{"year":2022,"finding":"Gain-of-function mutations in KCNK3 cluster around the X-gate and produce overactive channels that no longer respond to inhibition by G-protein-coupled receptor pathways but can still be inhibited by known TASK channel inhibitors; these mutations cause a developmental disorder with sleep apnea (DDSA).","method":"Electrophysiology (patch clamp), mutagenesis in heterologous expression systems, GPCR inhibition assays","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 1/2 — electrophysiology and mutagenesis functionally characterizing X-gate GOF variants with pharmacological rescue","pmids":["36195757"],"is_preprint":false},{"year":2010,"finding":"TASK1 and TASK3 channels in thalamocortical neurons contribute to the muscarine- and halothane-sensitive conductance; pharmacological blockade of TASK channels switches neurons from tonic to burst firing mode, demonstrating TASK1's role in regulating sleep-wake activity modes.","method":"Whole-cell patch clamp in rat brain slices, RT-PCR, in situ hybridization, pharmacological manipulation","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — electrophysiology in native neurons with molecular identification and functional phenotype","pmids":["12878686"],"is_preprint":false},{"year":2010,"finding":"TASK1 and TASK3 channels in brain slice preparations are inhibited by pH reduction and O2 deprivation, leading to membrane depolarization; pharmacological TASK blockade in vivo increases infarct volume in transient MCAO, and TASK1-/- mice develop significantly larger infarcts, demonstrating a neuroprotective role during ischemia.","method":"Patch clamp in brain slices, in vivo transient MCAO model, TASK1 knockout mice, pharmacological blockade (anandamide)","journal":"Neurobiology of disease","confidence":"High","confidence_rationale":"Tier 2 — genetic KO combined with pharmacological intervention and defined ischemic phenotype","pmids":["18930826"],"is_preprint":false},{"year":2010,"finding":"PKG activation upregulates TASK-1 channels in cholinergic basal forebrain neurons by reducing H+ binding affinity (increasing K_d for protonation) at pH sensor H98; PKG inhibition has the opposite effect; this dynamic modulation was validated in HEK293 cells expressing PKG and TASK-1, and H98 mutation abolishes PKG modulation.","method":"Whole-cell patch clamp in basal forebrain neurons and HEK293 cells, H98 mutagenesis, pharmacological PKG activation/inhibition","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1/2 — electrophysiology with site-directed mutagenesis confirming H98 as site of PKG-dependent modulation in both heterologous and native cells","pmids":["20410120"],"is_preprint":false},{"year":2019,"finding":"Sp1 transcription factor controls p11 expression, and increased p11 promotes TASK-1 membrane insertion, reducing neuronal excitability in motor neurons; in the SOD1-G93A ALS mouse model, Sp1-p11-TASK-1 dysregulation contributes to motor neuron hyperexcitability and degeneration; interference with Sp1 or p11 is neuroprotective.","method":"In vivo ALS mouse model, genetic interference (siRNA/knockdown of Sp1 and p11), electrophysiology, survival analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — pathway established by genetic epistasis in vivo with defined cellular and functional phenotype","pmids":["31439839"],"is_preprint":false},{"year":2014,"finding":"TASK-1 is inhibited by phosphorylation in chronic atrial fibrillation (human and canine); addition of phosphatase to the patch pipette rescues TASK-1 current from AF myocytes; total TASK-1 protein levels do not decrease, indicating post-translational phosphorylation-dependent loss of function rather than reduced expression.","method":"Whole-cell patch clamp with and without intracellular phosphatase, Western blot, tissue from human AF patients and chronically paced canines","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"High","confidence_rationale":"Tier 2 — direct rescue by phosphatase in patch pipette confirms phosphorylation-dependent mechanism in native tissue","pmids":["25437921"],"is_preprint":false},{"year":2016,"finding":"KCNK3 expression and function are reduced in human PAH and experimental pulmonary hypertension; loss of KCNK3 leads to pulmonary artery smooth muscle cell and endothelial cell proliferation, vasoconstriction, and inflammation; in vivo pharmacological activation of KCNK3 reverses monocrotaline-induced pulmonary hypertension in rats.","method":"Patch clamp in freshly isolated PASMCs, siRNA knockdown, monocrotaline rat PH model, in vivo pharmacological activation","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 2 — multiple models with defined cellular and hemodynamic phenotype, pharmacological rescue provides functional confirmation","pmids":["26912814"],"is_preprint":false},{"year":2017,"finding":"Heterozygous KCNK3 mutations associated with PAH cause mutation-specific severity of channel dysfunction in both homomeric and heterodimeric channel configurations with KCNK9; KCNK9 co-assembly partially compensates for select KCNK3 mutations in tissues where both are expressed; ONO-RS-082 activates both wildtype and mutant KCNK3 causing hyperpolarization.","method":"Whole-cell patch clamp in human pulmonary artery smooth muscle cells and COS7 cells, engineered homomeric and heterodimeric mutant constructs","journal":"Journal of the American Heart Association","confidence":"High","confidence_rationale":"Tier 1/2 — electrophysiology of engineered heterodimers with pharmacological characterization in human cells","pmids":["28889099"],"is_preprint":false},{"year":2019,"finding":"Kcnk3-mutated rats (CRISPR/Cas9 94 bp deletion) lack KCNK3 current in pulmonary arterial smooth muscle cells; they develop spontaneous age-dependent pulmonary hypertension with plasma membrane depolarization, overactivation of ERK1/2, AKT, SRC, HIF1-α overexpression, reduced eNOS, impaired endothelial-derived hyperpolarizing factor, and increased susceptibility to experimental PH triggers.","method":"CRISPR/Cas9 knockout rat, patch clamp, echocardiography, hemodynamic measurements, signaling pathway analysis","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 — genetic KO model with comprehensive mechanistic characterization at electrophysiological, cellular, and molecular levels","pmids":["31347976"],"is_preprint":false},{"year":2015,"finding":"TASK1 modulates β-adrenergic response in brown adipocytes through the mineralocorticoid receptor (MR) pathway; Task1-null mice show impaired β3-adrenergic receptor response (reduced oxygen consumption, UCP1 expression, lipolysis) that is mimicked by corticoids and reversed by an MR inhibitor, indicating TASK1 controls thermogenic activity by modulating MR signaling.","method":"Task1-/- mouse model, brown adipocyte functional assays (OCR, UCP1, lipolysis), pharmacological MR modulation","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 — KO mouse with defined cellular phenotype but mechanistic link to MR pathway based on pharmacological rescue only","pmids":["26527067"],"is_preprint":false},{"year":2003,"finding":"GABAB receptor activation in rat carotid body type I cells activates a TASK-1-like background K+ conductance (anandamide- and Ba2+-sensitive) via Gi protein and PKA signaling (not PKC), providing presynaptic autoregulatory feedback that modulates hypoxia-induced chemosensory transmission.","method":"Patch clamp in carotid body cell clusters, GABAB receptor agonist/antagonist pharmacology, pertussis toxin, PKA inhibitor H-89","journal":"The Journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological dissection in native cells with multiple inhibitors, but TASK-1 identity inferred pharmacologically","pmids":["12949228"],"is_preprint":false},{"year":2017,"finding":"TASK1 and TALK2, two K2P channels from different subfamilies, can heterodimerize in a pancreatic cell line and HEK293 cells; TASK1-TALK2 heterodimer currents show unique hybrid sensitivity to extracellular pH and halothane; co-expression of dominant-negative TALK2 reduces TASK1 currents.","method":"Single-molecule TIRF imaging, bimolecular fluorescence complementation, FRET, whole-cell patch clamp, tandem construct functional characterization","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 1/2 — multiple biophysical methods identifying heterodimerization but performed in heterologous systems","pmids":["29016681"],"is_preprint":false},{"year":2019,"finding":"Doxapram inhibits human TASK-1 and TASK-3 channels equipotently (unlike rodent channels where it is selective for TASK-1); the inhibitory effect requires hydrophobic residues in the pore-lining region and the C-terminus of TASK-3; the positive enantiomer GAL-054 is more potent than doxapram.","method":"Whole-cell patch clamp in tsA201 cells expressing cloned human or mouse TASK channels, site-directed mutagenesis of pore-lining residues","journal":"Acta physiologica","confidence":"Medium","confidence_rationale":"Tier 1/2 — electrophysiology combined with mutagenesis identifying pore residues for doxapram binding in heterologous system","pmids":["31423744"],"is_preprint":false},{"year":2018,"finding":"KCNK3 is predominantly expressed in adult rat right ventricular (RV) cardiomyocytes compared to left ventricular cardiomyocytes and participates in RV action potential repolarization; KCNK3 function is reduced prior to development of RV hypertrophy in multiple experimental PH models; chronic KCNK3 inhibition in rats induces RV hypertrophy, fibrosis, inflammation, and impaired RV function.","method":"Whole-cell patch clamp in isolated RV and LV cardiomyocytes, multiple rat PH models, pharmacological chronic KCNK3 inhibition with A293, echocardiography","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 — direct electrophysiological measurement in native cardiomyocytes plus pharmacological loss-of-function with defined cardiac phenotype across multiple models","pmids":["29360952"],"is_preprint":false},{"year":2019,"finding":"miR-34a increases TASK-1 (KCNK3) expression and current in human iPSCs and decreases resting membrane potential in TASK-1-expressing Xenopus oocytes; miR-25, miR-21, miR-34a, and other miRNAs regulate KCNK3 expression in AF patients and are associated with atrial cardiomyopathy parameters.","method":"miRNA mimic/inhibitor transfection in human iPSCs, Western blot, two-electrode voltage clamp in Xenopus oocytes","journal":"Journal of the American Heart Association","confidence":"Medium","confidence_rationale":"Tier 2/3 — direct functional validation of miR-34a on TASK-1 current in oocytes but regulatory network is correlative in patient tissue","pmids":["35301863"],"is_preprint":false},{"year":2011,"finding":"TASK-1 knockout mice display prolonged QTc interval and broadened QRS complex; TASK-1 current modulates action potential duration in ventricular cardiomyocytes; isoflurane slows heart rate and AV conduction in wild-type but not TASK-1-/- mice, demonstrating TASK-1 mediates isoflurane's cardiac electrophysiological effects.","method":"TASK-1 knockout mice, surface ECG, in vivo electrophysiological catheter protocol, action potential recordings, isoflurane challenge","journal":"Cellular physiology and biochemistry","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with multiple defined electrophysiological phenotypes and pharmacological validation","pmids":["21865850"],"is_preprint":false},{"year":2007,"finding":"Volatile anesthetics (isoflurane enantiomers, sevoflurane, halothane) activate human TASK-1 at clinically relevant concentrations, whereas intravenous anesthetic etomidate inhibits TASK-1 (and TASK-3) in a concentration-dependent manner; propofol has no effect on TASK-1 or TASK-3.","method":"Whole-cell patch clamp in Xenopus oocytes and rat ventricular myocytes, pharmacological characterization of anesthetics","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 1 — direct in vitro electrophysiological characterization in multiple systems comparing multiple anesthetic agents","pmids":["17699638"],"is_preprint":false},{"year":2002,"finding":"TASK-1 protein is localized to intercalated disks and the transverse-axial tubular network (T-tubules) in rat ventricular myocytes, as confirmed by detubulation with formamide; atrial myocytes show staining at intercalated disks with punctate T-tubule pattern.","method":"Western blot, immunofluorescence, formamide detubulation, RT-PCR in rat cardiac tissue","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"Medium","confidence_rationale":"Tier 2/3 — localization with functional implication via detubulation confirmation but no direct functional consequence assay","pmids":["12063289"],"is_preprint":false},{"year":2024,"finding":"KCNK3 knockdown in human pulmonary endothelial cells (hPECs) reduces migration, proliferation, and in vitro tubulogenesis, reduces caveolae number, and promotes mitochondrial membrane depolarization and glycolytic shift in hPASMCs; proximity labeling mass spectrometry identified the KCNK3 interactome across multiple cellular compartments; dasatinib decreases KCNK3 function/expression contributing to PA constriction.","method":"siRNA knockdown, proximity labeling + mass spectrometry (interactome), patch clamp, mitochondrial membrane potential assay, tube formation assay, caveolae quantification","journal":"American journal of respiratory cell and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods identifying downstream consequences of KCNK3 loss and defining interactome, but interactome requires further functional validation","pmids":["38546978"],"is_preprint":false},{"year":2015,"finding":"TASK1 and TASK3 channels contribute to T lymphocyte effector function (cytokine production and proliferation); application of TASK blockers reduces outward current in CD3+ T cells by ~40% and inhibits IFN-γ production; TASK1-/- mice show impaired T cell proliferation/cytokine production and are protected from experimental autoimmune encephalomyelitis.","method":"Patch clamp on T lymphocytes, TASK1 knockout mice, EAE adoptive transfer model, pharmacological TASK blockade","journal":"Brain: a journal of neurology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO and pharmacological inhibition with defined T cell and in vivo immune phenotype","pmids":["19570851"],"is_preprint":false}],"current_model":"KCNK3 (TASK-1) is a two-pore domain background K+ channel that sets resting membrane potential in excitable cells including pulmonary artery smooth muscle cells, cardiomyocytes, and neurons; its surface expression is regulated by p11/annexin II (via C-terminal SSV motif) and 14-3-3-dependent suppression of COPI-mediated ER retention, while its activity is controlled by extracellular pH (sensed via H98), hypoxia, volatile anesthetics, and Gq-coupled GPCR signaling via a PLC→DAG pathway, with PKC causing 14-3-3β-dependent endocytic internalization; an intramembrane 'X-gate' (VLRFMT) controls channel open probability and traps high-affinity inhibitors within the vestibule; loss-of-function mutations or reduced expression cause pulmonary arterial hypertension, RV hypertrophy, and atrial fibrillation, while gain-of-function X-gate mutations produce overactive channels insensitive to GPCR inhibition causing a developmental disorder with sleep apnea."},"narrative":{"teleology":[{"year":2001,"claim":"Establishing how GPCRs regulate TASK-1: Gq-coupled receptor inhibition of TASK-1 was shown to require PLC activity, ruling out direct G-protein or individual second-messenger mechanisms and identifying the PLC step as the obligate signal.","evidence":"Two-electrode voltage clamp in Xenopus oocytes with heterologous receptor expression and PLC inhibitor dissection","pmids":["11443069"],"confidence":"High","gaps":["The precise downstream effector of PLC (PIP2 depletion vs. DAG vs. IP3) was not resolved","Mechanism in native cells not yet shown"]},{"year":2002,"claim":"Defining how TASK-1 reaches the plasma membrane: p11 was identified as a trafficking partner that masks a C-terminal ER retention signal (KRR) by binding the SSV motif, and H98 was identified as the principal extracellular pH sensor, establishing two fundamental regulatory axes — trafficking and gating.","evidence":"Co-immunoprecipitation and mutagenesis trafficking assays for p11; site-directed mutagenesis with two-electrode voltage clamp for H98","pmids":["12198146","12634929"],"confidence":"High","gaps":["Whether p11 acts alone or requires 14-3-3 was unclear","Other residues contributing to pH sensing remained uncharacterized"]},{"year":2003,"claim":"Establishing TASK-1 as the physiological background K+ conductance in pulmonary vasculature and neurons: pharmacological profiling in native PASMCs and cerebellar granule neurons matched TASK-1, linking the channel to vascular tone and neuronal resting potential.","evidence":"Whole-cell patch clamp with TASK-1-selective pharmacological profiling in native rabbit PASMCs and rat cerebellar neurons","pmids":["14551239","12215606"],"confidence":"High","gaps":["Molecular identity relied on pharmacological matching without genetic confirmation","Contribution of TASK-3 heterodimers not distinguished"]},{"year":2007,"claim":"Resolving the trafficking hierarchy: 14-3-3 binding was shown to be the primary mechanism suppressing COPI-mediated ER retention at both N- and C-terminal sites, with p11 acting downstream and modulatory; volatile anesthetics were characterized as direct TASK-1 activators at clinical concentrations.","evidence":"Pulldown and deletion mutant trafficking assays for 14-3-3/COPI; patch clamp with multiple anesthetics in oocytes and cardiomyocytes","pmids":["17908283","17699638"],"confidence":"High","gaps":["Phosphorylation events governing 14-3-3 binding site accessibility not defined","Anesthetic binding site not structurally mapped"]},{"year":2009,"claim":"Delineating the full Gq signaling cascade in native cells and identifying TASK-1/TASK-3 heterodimers: ET-1 was shown to inhibit TASK-1 via ETA→PLC→DAG→PKC in human PASMCs, and single-channel recordings in carotid body identified functional TASK-1/TASK-3 heterodimers as the oxygen-sensitive conductance.","evidence":"Patch clamp with complete pharmacological pathway dissection and siRNA in hPASMCs; single-channel recording in native carotid body cells","pmids":["19188660","19403596"],"confidence":"High","gaps":["Whether PKC acts directly on the channel or via an intermediary was not resolved","Heterodimer stoichiometry and regulation not determined"]},{"year":2010,"claim":"Expanding the regulatory landscape: PKG was found to modulate TASK-1 gating by altering H98-dependent proton affinity in basal forebrain neurons, and TASK-1 knockout mice revealed neuroprotective roles during ischemia and roles in thalamocortical firing mode transitions.","evidence":"Patch clamp with H98 mutagenesis and PKG modulators in native neurons and HEK293 cells; TASK-1 KO mice in MCAO ischemia model and brain slice recordings","pmids":["20410120","18930826","12878686"],"confidence":"High","gaps":["PKG phosphorylation site on TASK-1 not identified","Relative contribution of TASK-1 vs TASK-3 in thalamocortical neurons not fully resolved"]},{"year":2012,"claim":"Distinguishing two modes of GPCR regulation — gating vs. trafficking: PKC was shown to drive 14-3-3β-dependent endocytic internalization of TASK-1 via a novel endocytic motif (acute trafficking regulation), while in cardiomyocytes ET-1 inhibited TASK-1 gating through PLC independently of PKC, indicating cell-type-specific regulatory mechanisms.","evidence":"Surface biotinylation and siRNA of 14-3-3β in cerebellar neurons; patch clamp with PKC/rho kinase inhibitors in rat cardiomyocytes","pmids":["22846993","22977011"],"confidence":"High","gaps":["The endocytic motif sequence and its relationship to the 14-3-3 binding site not fully mapped","Whether trafficking and gating regulation co-occur in the same cell type unknown"]},{"year":2014,"claim":"Identifying DAG as the direct second messenger and linking channel phosphorylation to atrial fibrillation: DAG (not PIP2 depletion or IP3/Ca2+) was established as the signal mediating Gq-coupled GPCR inhibition of TASK channels, and phosphorylation-dependent TASK-1 loss of function was demonstrated in human AF tissue.","evidence":"DAG kinase/lipase manipulation with fluorescent reporters in heterologous cells; patch clamp with intracellular phosphatase rescue in human AF myocytes","pmids":["25420509","25437921"],"confidence":"High","gaps":["The DAG binding site on TASK-1 not identified","The specific kinase and phosphorylation site responsible for AF-associated inhibition not determined"]},{"year":2016,"claim":"Establishing KCNK3 loss of function as a driver of pulmonary hypertension pathobiology: reduced KCNK3 expression/function in human PAH and animal models was shown to cause PASMC/endothelial proliferation, vasoconstriction, and inflammation, with in vivo pharmacological activation reversing experimental PH.","evidence":"Patch clamp in freshly isolated PASMCs, siRNA, monocrotaline rat model with pharmacological rescue","pmids":["26912814"],"confidence":"High","gaps":["Mechanism of KCNK3 downregulation in PAH not established","Whether pharmacological activation is sufficient in genetic forms of PAH unknown"]},{"year":2019,"claim":"Genetic proof that KCNK3 loss causes spontaneous pulmonary hypertension: CRISPR-generated Kcnk3-null rats developed age-dependent PH with membrane depolarization, overactivation of ERK1/2, AKT, SRC, and HIF1-α overexpression, defining the downstream signaling cascade.","evidence":"CRISPR/Cas9 knockout rat with comprehensive hemodynamic, electrophysiological, and signaling pathway analysis","pmids":["31347976"],"confidence":"High","gaps":["Whether the signaling cascade is a direct consequence of depolarization or involves KCNK3-specific protein interactions unknown","Therapeutic targeting of these downstream pathways not tested"]},{"year":2020,"claim":"Structural basis of gating and drug trapping resolved: the X-ray crystal structure revealed an intramembrane X-gate (VLRFMT at M4 helix crossing) that controls channel open probability; high-affinity inhibitors bind below the selectivity filter and are physically trapped by X-gate closure.","evidence":"X-ray crystallography with inhibitor co-crystal structures, validated by mutagenesis and electrophysiology","pmids":["32499642"],"confidence":"High","gaps":["How GPCR signaling is transduced to the X-gate conformationally not determined","Structure of the open state not available"]},{"year":2022,"claim":"Gain-of-function X-gate mutations were shown to cause a developmental disorder with sleep apnea (DDSA), producing overactive channels insensitive to GPCR-mediated inhibition but still responsive to pharmacological blockers, establishing a new disease mechanism.","evidence":"Patch clamp and mutagenesis in heterologous systems with GPCR inhibition assays, published in Nature Genetics","pmids":["36195757"],"confidence":"High","gaps":["Tissue-specific pathophysiology of GOF variants not characterized in vivo","Whether pharmacological rescue translates to therapeutic benefit untested"]},{"year":null,"claim":"Key unresolved questions include the structural basis for DAG-mediated channel inhibition, the conformational mechanism linking GPCR signaling to X-gate closure, the identity of the kinase and phosphorylation site underlying AF-associated TASK-1 inhibition, and whether combined pharmacological activation strategies can treat both LOF (PAH) and GOF (DDSA) KCNK3 channelopathies.","evidence":"","pmids":[],"confidence":"Low","gaps":["DAG binding site on TASK-1 unknown","Open-state channel structure unavailable","Phosphorylation site(s) mediating AF-associated inhibition not mapped","In vivo pharmacological rescue of GOF variants not tested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[2,3,7,28]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,4,11,30]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,4]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,8,9,10]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[2,3,7,28]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[7,14,15,16]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[19,21,26]}],"complexes":["TASK-1/TASK-3 heterodimer"],"partners":["S100A10","YWHAB","KCNK9","KCNK17"],"other_free_text":[]},"mechanistic_narrative":"KCNK3 (TASK-1) is a two-pore-domain background potassium channel that sets the resting membrane potential in pulmonary artery smooth muscle cells, cardiomyocytes, neurons, and immune cells, thereby controlling vascular tone, cardiac repolarization, neuronal excitability, and T cell effector function [PMID:14551239, PMID:21865850, PMID:19570851]. Its surface expression depends on 14-3-3-mediated suppression of COPI-dependent ER retention and p11/annexin II binding to a C-terminal SSV motif, while PKC triggers 14-3-3β-dependent endocytic internalization [PMID:12198146, PMID:17908283, PMID:22846993]. Channel gating is regulated by extracellular pH via histidine H98, by Gq-coupled GPCR signaling through a PLC→DAG pathway, by volatile anesthetics, and by an intramembrane X-gate (VLRFMT motif) that controls open probability and traps high-affinity inhibitors within the vestibule [PMID:12634929, PMID:25420509, PMID:32499642]. Loss-of-function mutations or reduced expression cause pulmonary arterial hypertension and right ventricular dysfunction, whereas gain-of-function X-gate mutations produce overactive, GPCR-insensitive channels causing a developmental disorder with sleep apnea [PMID:31347976, PMID:36195757]."},"prefetch_data":{"uniprot":{"accession":"O14649","full_name":"Potassium channel subfamily K member 3","aliases":["Acid-sensitive potassium channel protein TASK-1","TWIK-related acid-sensitive K(+) channel 1","Two pore potassium channel KT3.1","Two pore K(+) channel KT3.1"],"length_aa":394,"mass_kda":43.5,"function":"K(+) channel that conducts voltage-dependent outward rectifying currents upon membrane depolarization. Voltage sensing is coupled to K(+) electrochemical gradient in an 'ion flux gating' mode where outward but not inward ion flow opens the gate (PubMed:23169818, PubMed:26919430, PubMed:32499642, PubMed:36195757, PubMed:9312005). Changes ion selectivity and becomes permeable to Na(+) ions in response to extracellular acidification. Protonation of the pH sensor His-98 stabilizes C-type inactivation conformation likely converting the channel from outward K(+)-conducting, to inward Na(+)-conducting to nonconductive state (PubMed:22948150). Homo- and heterodimerizes to form functional channels with distinct regulatory and gating properties (PubMed:23169818, PubMed:32499642). Allows K(+) currents with fast-gating kinetics important for the repolarization and hyperpolarization phases of action potentials (By similarity). In cerebellar granule cells, heteromeric KCNK3:KCNK9 channel may hyperpolarize the resting membrane potential to limit intrinsic neuronal excitability, but once the action potential threshold is reached, it may support high-frequency action potential firing and increased neuronal excitability (By similarity). Dispensable for central chemosensory respiration i.e. breathing controlled by brainstem CO2/pH, it rather conducts pH-sensitive currents and controls the firing rate of serotonergic raphe neurons involved in potentiation of the respiratory chemoreflex. Additionally, imparts chemosensitivity to type 1 cells in carotid bodies which respond to a decrease in arterial oxygen pressure or an increase in carbon dioxide pressure or pH to initiate adaptive changes in pulmonary ventilation (By similarity). In adrenal gland, contributes to the maintenance of a hyperpolarized resting membrane potential of aldosterone-producing cells at zona glomerulosa and limits aldosterone release as part of a regulatory mechanism that controls arterial blood pressure and electrolyte homeostasis (By similarity). In brown adipocytes, mediates K(+) efflux that counteracts norepinephrine-induced membrane depolarization, limits Ca(2+) efflux and downstream cAMP and PKA signaling, ultimately attenuating lipid oxidation and adaptive thermogenesis (By similarity)","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/O14649/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KCNK3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/KCNK3","total_profiled":1310},"omim":[{"mim_id":"621402","title":"DEVELOPMENTAL DELAY WITH SLEEP APNEA; DDSA","url":"https://www.omim.org/entry/621402"},{"mim_id":"615344","title":"PULMONARY HYPERTENSION, PRIMARY, 4; PPH4","url":"https://www.omim.org/entry/615344"},{"mim_id":"613677","title":"HYPERALDOSTERONISM, FAMILIAL, TYPE III; HALD3","url":"https://www.omim.org/entry/613677"},{"mim_id":"612048","title":"TRANSMEMBRANE PROTEIN 43; TMEM43","url":"https://www.omim.org/entry/612048"},{"mim_id":"607368","title":"POTASSIUM CHANNEL, SUBFAMILY K, MEMBER 15; KCNK15","url":"https://www.omim.org/entry/607368"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"adrenal gland","ntpm":169.1}],"url":"https://www.proteinatlas.org/search/KCNK3"},"hgnc":{"alias_symbol":["K2p3.1","TASK","TASK-1","TASK1"],"prev_symbol":[]},"alphafold":{"accession":"O14649","domains":[{"cath_id":"-","chopping":"1-73","consensus_level":"medium","plddt":94.9466,"start":1,"end":73},{"cath_id":"1.10.287.70","chopping":"121-263","consensus_level":"medium","plddt":92.4589,"start":121,"end":263}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O14649","model_url":"https://alphafold.ebi.ac.uk/files/AF-O14649-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O14649-F1-predicted_aligned_error_v6.png","plddt_mean":74.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KCNK3","jax_strain_url":"https://www.jax.org/strain/search?query=KCNK3"},"sequence":{"accession":"O14649","fasta_url":"https://rest.uniprot.org/uniprotkb/O14649.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O14649/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O14649"}},"corpus_meta":[{"pmid":"20880069","id":"PMC_20880069","title":"Screening for tumours in paraneoplastic syndromes: report of an EFNS task force.","date":"2010","source":"European journal of neurology","url":"https://pubmed.ncbi.nlm.nih.gov/20880069","citation_count":335,"is_preprint":false},{"pmid":"19259102","id":"PMC_19259102","title":"Plasma membrane expansion: a neuron's Herculean task.","date":"2009","source":"Nature reviews. 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similarity task performance requires the prefrontal cortex.","date":"2021","source":"Hippocampus","url":"https://pubmed.ncbi.nlm.nih.gov/33606338","citation_count":18,"is_preprint":false},{"pmid":"22867444","id":"PMC_22867444","title":"Implicit motives, explicit traits, and task and contextual performance at work.","date":"2012","source":"The Journal of applied psychology","url":"https://pubmed.ncbi.nlm.nih.gov/22867444","citation_count":18,"is_preprint":false},{"pmid":"23007462","id":"PMC_23007462","title":"Modulation of K2P3.1 (TASK-1), K2P9.1 (TASK-3), and TASK-1/3 heteromer by reactive oxygen species.","date":"2012","source":"Pflugers Archiv : European journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/23007462","citation_count":18,"is_preprint":false},{"pmid":"21170318","id":"PMC_21170318","title":"Nuclear shield: a multi-enzyme task-force for nucleus protection.","date":"2010","source":"PloS 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Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with pharmacological dissection across multiple receptor systems, replicated across GPCR types\",\n      \"pmids\": [\"11443069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"TASK-1 mediates the noninactivating background K+ current (IKN) that sets the resting membrane potential in rabbit pulmonary artery smooth muscle cells; the current is inhibited by extracellular acidosis, Zn2+, anandamide, hypoxia, and enhanced by halothane, pharmacologically matching TASK-1 properties.\",\n      \"method\": \"Whole-cell patch clamp, RT-PCR, immunodetection in native PASMCs\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple pharmacological and molecular identification methods in native cells, replicated in similar studies\",\n      \"pmids\": [\"14551239\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TASK-1 (KCNK3) controls resting membrane potential in human PASMCs; it is inhibited by hypoxia and activated by treprostinil through PKA-dependent phosphorylation; TASK-1 siRNA knockdown abolishes sensitivity to anandamide, acidosis, alkalosis, hypoxia, and treprostinil.\",\n      \"method\": \"Whole-cell patch clamp, siRNA knockdown, pharmacological dissection in primary human PASMCs\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — siRNA knockdown with defined electrophysiological phenotype plus PKA pathway identification, multiple orthogonal methods\",\n      \"pmids\": [\"16574908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Forward transport of KCNK3 (K2P3.1) to the plasma membrane requires 14-3-3-mediated suppression of COPI binding at two separate N- and C-terminal sites; p11 binding to the C-terminal retention motif is dependent on prior 14-3-3 binding and serves a modulatory role in a subset of tissues.\",\n      \"method\": \"Pulldown, co-immunoprecipitation, deletion mutants, heterologous expression trafficking assays\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Co-IP, mutational analysis, trafficking assays) in single study with rigorous controls\",\n      \"pmids\": [\"17908283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TASK-1/TASK-3 heterodimeric channels constitute the major oxygen-sensitive background K+ conductance in rat carotid body glomus cells; single-channel conductance (~42 pS) and pharmacological profile (ruthenium red insensitivity, methanandamide sensitivity) distinguish heteromers from homodimers, and heterodimers are inhibited by hypoxia.\",\n      \"method\": \"Single-channel patch clamp (cell-attached and outside-out), manipulation of extracellular Mg2+, pharmacological profiling in native carotid body cells\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — detailed single-channel biophysics combined with pharmacological dissection in native cells\",\n      \"pmids\": [\"19403596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Histidine residue H98 (and to a lesser extent H72 and K210) in TASK-1 contributes to extracellular pH sensing; mutating H98 significantly shifts the K_d for H+ block, though additional residues/domains also contribute to pH sensitivity.\",\n      \"method\": \"Site-directed mutagenesis, two-electrode voltage clamp in Xenopus oocytes\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro mutagenesis with quantitative functional assay\",\n      \"pmids\": [\"12634929\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TASK-1 mediates a standing outward K+ current in rat cerebellar granule neurons that sets resting membrane potential; hypoxia inhibits this TASK-1-mediated current causing neuronal depolarization, demonstrated by occlusion with pH 6.4 acidosis and anandamide.\",\n      \"method\": \"Whole-cell patch clamp in primary cerebellar granule neurons, pharmacological occlusion experiments\",\n      \"journal\": \"Stroke\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological occlusion with two independent TASK-1 inhibitors in native neurons\",\n      \"pmids\": [\"12215606\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Endothelin-1 inhibits TASK-1 background K+ current in primary human PASMCs via ETA receptors coupled to phospholipase C, phosphatidylinositol 4,5-bisphosphate hydrolysis, diacylglycerol generation, and protein kinase C phosphorylation of TASK-1, causing membrane depolarization; TASK-1 siRNA abolishes ET-1 effect on membrane potential.\",\n      \"method\": \"Whole-cell patch clamp, siRNA knockdown, pharmacological inhibitors of ETA, PLC, PI(4,5)P2, DAG, PKC in primary hPASMCs\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — siRNA validation plus complete pathway pharmacological dissection with orthogonal methods\",\n      \"pmids\": [\"19188660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TASK-1 and TASK-3 channels are gated by diacylglycerol (DAG) downstream of Gαq/11-coupled GPCRs; receptor-initiated inhibition requires PLC activity and elevation of cellular DAG, but not PI(4,5)P2 depletion, IP3, or Ca2+ release; DAG kinase or lipase suppression of DAG transients blocks channel inhibition.\",\n      \"method\": \"Electrophysiology, DAG kinase/lipase manipulation, PI(4,5)P2 sensors, fluorescent DAG reporters, pharmacological dissection in heterologous cells\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — multiple orthogonal methods definitively ruling out alternative second messengers and identifying DAG as the direct signal\",\n      \"pmids\": [\"25420509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Endothelin-1 inhibits TASK-1 current (ITASK) in rat cardiomyocytes via endothelin-A receptors and is mediated by PLC; inhibition is not affected by PKC or rho kinase inhibitors; TASK-1 inhibition by ET-1 prolongs action potential duration in cardiomyocytes.\",\n      \"method\": \"Whole-cell patch clamp in isolated rat cardiomyocytes, pharmacological inhibitors (U73122, PKC inhibitors, rho kinase inhibitors), TIRFM PI(4,5)P2 measurements\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods identifying PLC as the relevant signaling mediator in native cardiomyocytes\",\n      \"pmids\": [\"22977011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PKC-mediated endocytic trafficking dynamically regulates KCNK3 surface expression and activity; phorbol ester or group I mGluR activation acutely internalizes KCNK3 in a 14-3-3β-dependent manner requiring a novel endocytic motif on KCNK3; depletion of 14-3-3β or ablation of the endocytic motif abrogates PKC-regulated trafficking.\",\n      \"method\": \"Electrophysiology, surface biotinylation, siRNA depletion, endocytic motif mutagenesis in cerebellar granule neurons and cell lines\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (electrophysiology, surface expression, mutagenesis) in native neurons and cell lines\",\n      \"pmids\": [\"22846993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TASK-1 (KCNK3) contains a lower gate (the 'X-gate') formed by the crossing of C-terminal M4 transmembrane helices (residues 243VLRFMT248); this gate controls channel open probability and responses to volatile anaesthetics and GPCRs; X-gate mutations affect gating, and high-affinity inhibitors bind below the selectivity filter and are trapped by the X-gate explaining slow washout.\",\n      \"method\": \"X-ray crystallography, mutagenesis, electrophysiology, inhibitor co-crystallization\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — X-ray crystal structure with functional mutagenesis and inhibitor co-crystal structures, multiple orthogonal validations\",\n      \"pmids\": [\"32499642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Gain-of-function mutations in KCNK3 cluster around the X-gate and produce overactive channels that no longer respond to inhibition by G-protein-coupled receptor pathways but can still be inhibited by known TASK channel inhibitors; these mutations cause a developmental disorder with sleep apnea (DDSA).\",\n      \"method\": \"Electrophysiology (patch clamp), mutagenesis in heterologous expression systems, GPCR inhibition assays\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — electrophysiology and mutagenesis functionally characterizing X-gate GOF variants with pharmacological rescue\",\n      \"pmids\": [\"36195757\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TASK1 and TASK3 channels in thalamocortical neurons contribute to the muscarine- and halothane-sensitive conductance; pharmacological blockade of TASK channels switches neurons from tonic to burst firing mode, demonstrating TASK1's role in regulating sleep-wake activity modes.\",\n      \"method\": \"Whole-cell patch clamp in rat brain slices, RT-PCR, in situ hybridization, pharmacological manipulation\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — electrophysiology in native neurons with molecular identification and functional phenotype\",\n      \"pmids\": [\"12878686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TASK1 and TASK3 channels in brain slice preparations are inhibited by pH reduction and O2 deprivation, leading to membrane depolarization; pharmacological TASK blockade in vivo increases infarct volume in transient MCAO, and TASK1-/- mice develop significantly larger infarcts, demonstrating a neuroprotective role during ischemia.\",\n      \"method\": \"Patch clamp in brain slices, in vivo transient MCAO model, TASK1 knockout mice, pharmacological blockade (anandamide)\",\n      \"journal\": \"Neurobiology of disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO combined with pharmacological intervention and defined ischemic phenotype\",\n      \"pmids\": [\"18930826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PKG activation upregulates TASK-1 channels in cholinergic basal forebrain neurons by reducing H+ binding affinity (increasing K_d for protonation) at pH sensor H98; PKG inhibition has the opposite effect; this dynamic modulation was validated in HEK293 cells expressing PKG and TASK-1, and H98 mutation abolishes PKG modulation.\",\n      \"method\": \"Whole-cell patch clamp in basal forebrain neurons and HEK293 cells, H98 mutagenesis, pharmacological PKG activation/inhibition\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — electrophysiology with site-directed mutagenesis confirming H98 as site of PKG-dependent modulation in both heterologous and native cells\",\n      \"pmids\": [\"20410120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Sp1 transcription factor controls p11 expression, and increased p11 promotes TASK-1 membrane insertion, reducing neuronal excitability in motor neurons; in the SOD1-G93A ALS mouse model, Sp1-p11-TASK-1 dysregulation contributes to motor neuron hyperexcitability and degeneration; interference with Sp1 or p11 is neuroprotective.\",\n      \"method\": \"In vivo ALS mouse model, genetic interference (siRNA/knockdown of Sp1 and p11), electrophysiology, survival analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pathway established by genetic epistasis in vivo with defined cellular and functional phenotype\",\n      \"pmids\": [\"31439839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TASK-1 is inhibited by phosphorylation in chronic atrial fibrillation (human and canine); addition of phosphatase to the patch pipette rescues TASK-1 current from AF myocytes; total TASK-1 protein levels do not decrease, indicating post-translational phosphorylation-dependent loss of function rather than reduced expression.\",\n      \"method\": \"Whole-cell patch clamp with and without intracellular phosphatase, Western blot, tissue from human AF patients and chronically paced canines\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct rescue by phosphatase in patch pipette confirms phosphorylation-dependent mechanism in native tissue\",\n      \"pmids\": [\"25437921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"KCNK3 expression and function are reduced in human PAH and experimental pulmonary hypertension; loss of KCNK3 leads to pulmonary artery smooth muscle cell and endothelial cell proliferation, vasoconstriction, and inflammation; in vivo pharmacological activation of KCNK3 reverses monocrotaline-induced pulmonary hypertension in rats.\",\n      \"method\": \"Patch clamp in freshly isolated PASMCs, siRNA knockdown, monocrotaline rat PH model, in vivo pharmacological activation\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple models with defined cellular and hemodynamic phenotype, pharmacological rescue provides functional confirmation\",\n      \"pmids\": [\"26912814\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Heterozygous KCNK3 mutations associated with PAH cause mutation-specific severity of channel dysfunction in both homomeric and heterodimeric channel configurations with KCNK9; KCNK9 co-assembly partially compensates for select KCNK3 mutations in tissues where both are expressed; ONO-RS-082 activates both wildtype and mutant KCNK3 causing hyperpolarization.\",\n      \"method\": \"Whole-cell patch clamp in human pulmonary artery smooth muscle cells and COS7 cells, engineered homomeric and heterodimeric mutant constructs\",\n      \"journal\": \"Journal of the American Heart Association\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — electrophysiology of engineered heterodimers with pharmacological characterization in human cells\",\n      \"pmids\": [\"28889099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Kcnk3-mutated rats (CRISPR/Cas9 94 bp deletion) lack KCNK3 current in pulmonary arterial smooth muscle cells; they develop spontaneous age-dependent pulmonary hypertension with plasma membrane depolarization, overactivation of ERK1/2, AKT, SRC, HIF1-α overexpression, reduced eNOS, impaired endothelial-derived hyperpolarizing factor, and increased susceptibility to experimental PH triggers.\",\n      \"method\": \"CRISPR/Cas9 knockout rat, patch clamp, echocardiography, hemodynamic measurements, signaling pathway analysis\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO model with comprehensive mechanistic characterization at electrophysiological, cellular, and molecular levels\",\n      \"pmids\": [\"31347976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TASK1 modulates β-adrenergic response in brown adipocytes through the mineralocorticoid receptor (MR) pathway; Task1-null mice show impaired β3-adrenergic receptor response (reduced oxygen consumption, UCP1 expression, lipolysis) that is mimicked by corticoids and reversed by an MR inhibitor, indicating TASK1 controls thermogenic activity by modulating MR signaling.\",\n      \"method\": \"Task1-/- mouse model, brown adipocyte functional assays (OCR, UCP1, lipolysis), pharmacological MR modulation\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with defined cellular phenotype but mechanistic link to MR pathway based on pharmacological rescue only\",\n      \"pmids\": [\"26527067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"GABAB receptor activation in rat carotid body type I cells activates a TASK-1-like background K+ conductance (anandamide- and Ba2+-sensitive) via Gi protein and PKA signaling (not PKC), providing presynaptic autoregulatory feedback that modulates hypoxia-induced chemosensory transmission.\",\n      \"method\": \"Patch clamp in carotid body cell clusters, GABAB receptor agonist/antagonist pharmacology, pertussis toxin, PKA inhibitor H-89\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological dissection in native cells with multiple inhibitors, but TASK-1 identity inferred pharmacologically\",\n      \"pmids\": [\"12949228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TASK1 and TALK2, two K2P channels from different subfamilies, can heterodimerize in a pancreatic cell line and HEK293 cells; TASK1-TALK2 heterodimer currents show unique hybrid sensitivity to extracellular pH and halothane; co-expression of dominant-negative TALK2 reduces TASK1 currents.\",\n      \"method\": \"Single-molecule TIRF imaging, bimolecular fluorescence complementation, FRET, whole-cell patch clamp, tandem construct functional characterization\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1/2 — multiple biophysical methods identifying heterodimerization but performed in heterologous systems\",\n      \"pmids\": [\"29016681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Doxapram inhibits human TASK-1 and TASK-3 channels equipotently (unlike rodent channels where it is selective for TASK-1); the inhibitory effect requires hydrophobic residues in the pore-lining region and the C-terminus of TASK-3; the positive enantiomer GAL-054 is more potent than doxapram.\",\n      \"method\": \"Whole-cell patch clamp in tsA201 cells expressing cloned human or mouse TASK channels, site-directed mutagenesis of pore-lining residues\",\n      \"journal\": \"Acta physiologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1/2 — electrophysiology combined with mutagenesis identifying pore residues for doxapram binding in heterologous system\",\n      \"pmids\": [\"31423744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"KCNK3 is predominantly expressed in adult rat right ventricular (RV) cardiomyocytes compared to left ventricular cardiomyocytes and participates in RV action potential repolarization; KCNK3 function is reduced prior to development of RV hypertrophy in multiple experimental PH models; chronic KCNK3 inhibition in rats induces RV hypertrophy, fibrosis, inflammation, and impaired RV function.\",\n      \"method\": \"Whole-cell patch clamp in isolated RV and LV cardiomyocytes, multiple rat PH models, pharmacological chronic KCNK3 inhibition with A293, echocardiography\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct electrophysiological measurement in native cardiomyocytes plus pharmacological loss-of-function with defined cardiac phenotype across multiple models\",\n      \"pmids\": [\"29360952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"miR-34a increases TASK-1 (KCNK3) expression and current in human iPSCs and decreases resting membrane potential in TASK-1-expressing Xenopus oocytes; miR-25, miR-21, miR-34a, and other miRNAs regulate KCNK3 expression in AF patients and are associated with atrial cardiomyopathy parameters.\",\n      \"method\": \"miRNA mimic/inhibitor transfection in human iPSCs, Western blot, two-electrode voltage clamp in Xenopus oocytes\",\n      \"journal\": \"Journal of the American Heart Association\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — direct functional validation of miR-34a on TASK-1 current in oocytes but regulatory network is correlative in patient tissue\",\n      \"pmids\": [\"35301863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TASK-1 knockout mice display prolonged QTc interval and broadened QRS complex; TASK-1 current modulates action potential duration in ventricular cardiomyocytes; isoflurane slows heart rate and AV conduction in wild-type but not TASK-1-/- mice, demonstrating TASK-1 mediates isoflurane's cardiac electrophysiological effects.\",\n      \"method\": \"TASK-1 knockout mice, surface ECG, in vivo electrophysiological catheter protocol, action potential recordings, isoflurane challenge\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with multiple defined electrophysiological phenotypes and pharmacological validation\",\n      \"pmids\": [\"21865850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Volatile anesthetics (isoflurane enantiomers, sevoflurane, halothane) activate human TASK-1 at clinically relevant concentrations, whereas intravenous anesthetic etomidate inhibits TASK-1 (and TASK-3) in a concentration-dependent manner; propofol has no effect on TASK-1 or TASK-3.\",\n      \"method\": \"Whole-cell patch clamp in Xenopus oocytes and rat ventricular myocytes, pharmacological characterization of anesthetics\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct in vitro electrophysiological characterization in multiple systems comparing multiple anesthetic agents\",\n      \"pmids\": [\"17699638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TASK-1 protein is localized to intercalated disks and the transverse-axial tubular network (T-tubules) in rat ventricular myocytes, as confirmed by detubulation with formamide; atrial myocytes show staining at intercalated disks with punctate T-tubule pattern.\",\n      \"method\": \"Western blot, immunofluorescence, formamide detubulation, RT-PCR in rat cardiac tissue\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — localization with functional implication via detubulation confirmation but no direct functional consequence assay\",\n      \"pmids\": [\"12063289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KCNK3 knockdown in human pulmonary endothelial cells (hPECs) reduces migration, proliferation, and in vitro tubulogenesis, reduces caveolae number, and promotes mitochondrial membrane depolarization and glycolytic shift in hPASMCs; proximity labeling mass spectrometry identified the KCNK3 interactome across multiple cellular compartments; dasatinib decreases KCNK3 function/expression contributing to PA constriction.\",\n      \"method\": \"siRNA knockdown, proximity labeling + mass spectrometry (interactome), patch clamp, mitochondrial membrane potential assay, tube formation assay, caveolae quantification\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods identifying downstream consequences of KCNK3 loss and defining interactome, but interactome requires further functional validation\",\n      \"pmids\": [\"38546978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TASK1 and TASK3 channels contribute to T lymphocyte effector function (cytokine production and proliferation); application of TASK blockers reduces outward current in CD3+ T cells by ~40% and inhibits IFN-γ production; TASK1-/- mice show impaired T cell proliferation/cytokine production and are protected from experimental autoimmune encephalomyelitis.\",\n      \"method\": \"Patch clamp on T lymphocytes, TASK1 knockout mice, EAE adoptive transfer model, pharmacological TASK blockade\",\n      \"journal\": \"Brain: a journal of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO and pharmacological inhibition with defined T cell and in vivo immune phenotype\",\n      \"pmids\": [\"19570851\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"KCNK3 (TASK-1) is a two-pore domain background K+ channel that sets resting membrane potential in excitable cells including pulmonary artery smooth muscle cells, cardiomyocytes, and neurons; its surface expression is regulated by p11/annexin II (via C-terminal SSV motif) and 14-3-3-dependent suppression of COPI-mediated ER retention, while its activity is controlled by extracellular pH (sensed via H98), hypoxia, volatile anesthetics, and Gq-coupled GPCR signaling via a PLC→DAG pathway, with PKC causing 14-3-3β-dependent endocytic internalization; an intramembrane 'X-gate' (VLRFMT) controls channel open probability and traps high-affinity inhibitors within the vestibule; loss-of-function mutations or reduced expression cause pulmonary arterial hypertension, RV hypertrophy, and atrial fibrillation, while gain-of-function X-gate mutations produce overactive channels insensitive to GPCR inhibition causing a developmental disorder with sleep apnea.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"KCNK3 (TASK-1) is a two-pore-domain background potassium channel that sets the resting membrane potential in pulmonary artery smooth muscle cells, cardiomyocytes, neurons, and immune cells, thereby controlling vascular tone, cardiac repolarization, neuronal excitability, and T cell effector function [PMID:14551239, PMID:21865850, PMID:19570851]. Its surface expression depends on 14-3-3-mediated suppression of COPI-dependent ER retention and p11/annexin II binding to a C-terminal SSV motif, while PKC triggers 14-3-3β-dependent endocytic internalization [PMID:12198146, PMID:17908283, PMID:22846993]. Channel gating is regulated by extracellular pH via histidine H98, by Gq-coupled GPCR signaling through a PLC→DAG pathway, by volatile anesthetics, and by an intramembrane X-gate (VLRFMT motif) that controls open probability and traps high-affinity inhibitors within the vestibule [PMID:12634929, PMID:25420509, PMID:32499642]. Loss-of-function mutations or reduced expression cause pulmonary arterial hypertension and right ventricular dysfunction, whereas gain-of-function X-gate mutations produce overactive, GPCR-insensitive channels causing a developmental disorder with sleep apnea [PMID:31347976, PMID:36195757].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Establishing how GPCRs regulate TASK-1: Gq-coupled receptor inhibition of TASK-1 was shown to require PLC activity, ruling out direct G-protein or individual second-messenger mechanisms and identifying the PLC step as the obligate signal.\",\n      \"evidence\": \"Two-electrode voltage clamp in Xenopus oocytes with heterologous receptor expression and PLC inhibitor dissection\",\n      \"pmids\": [\"11443069\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The precise downstream effector of PLC (PIP2 depletion vs. DAG vs. IP3) was not resolved\", \"Mechanism in native cells not yet shown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defining how TASK-1 reaches the plasma membrane: p11 was identified as a trafficking partner that masks a C-terminal ER retention signal (KRR) by binding the SSV motif, and H98 was identified as the principal extracellular pH sensor, establishing two fundamental regulatory axes — trafficking and gating.\",\n      \"evidence\": \"Co-immunoprecipitation and mutagenesis trafficking assays for p11; site-directed mutagenesis with two-electrode voltage clamp for H98\",\n      \"pmids\": [\"12198146\", \"12634929\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether p11 acts alone or requires 14-3-3 was unclear\", \"Other residues contributing to pH sensing remained uncharacterized\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Establishing TASK-1 as the physiological background K+ conductance in pulmonary vasculature and neurons: pharmacological profiling in native PASMCs and cerebellar granule neurons matched TASK-1, linking the channel to vascular tone and neuronal resting potential.\",\n      \"evidence\": \"Whole-cell patch clamp with TASK-1-selective pharmacological profiling in native rabbit PASMCs and rat cerebellar neurons\",\n      \"pmids\": [\"14551239\", \"12215606\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular identity relied on pharmacological matching without genetic confirmation\", \"Contribution of TASK-3 heterodimers not distinguished\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolving the trafficking hierarchy: 14-3-3 binding was shown to be the primary mechanism suppressing COPI-mediated ER retention at both N- and C-terminal sites, with p11 acting downstream and modulatory; volatile anesthetics were characterized as direct TASK-1 activators at clinical concentrations.\",\n      \"evidence\": \"Pulldown and deletion mutant trafficking assays for 14-3-3/COPI; patch clamp with multiple anesthetics in oocytes and cardiomyocytes\",\n      \"pmids\": [\"17908283\", \"17699638\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphorylation events governing 14-3-3 binding site accessibility not defined\", \"Anesthetic binding site not structurally mapped\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Delineating the full Gq signaling cascade in native cells and identifying TASK-1/TASK-3 heterodimers: ET-1 was shown to inhibit TASK-1 via ETA→PLC→DAG→PKC in human PASMCs, and single-channel recordings in carotid body identified functional TASK-1/TASK-3 heterodimers as the oxygen-sensitive conductance.\",\n      \"evidence\": \"Patch clamp with complete pharmacological pathway dissection and siRNA in hPASMCs; single-channel recording in native carotid body cells\",\n      \"pmids\": [\"19188660\", \"19403596\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PKC acts directly on the channel or via an intermediary was not resolved\", \"Heterodimer stoichiometry and regulation not determined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Expanding the regulatory landscape: PKG was found to modulate TASK-1 gating by altering H98-dependent proton affinity in basal forebrain neurons, and TASK-1 knockout mice revealed neuroprotective roles during ischemia and roles in thalamocortical firing mode transitions.\",\n      \"evidence\": \"Patch clamp with H98 mutagenesis and PKG modulators in native neurons and HEK293 cells; TASK-1 KO mice in MCAO ischemia model and brain slice recordings\",\n      \"pmids\": [\"20410120\", \"18930826\", \"12878686\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PKG phosphorylation site on TASK-1 not identified\", \"Relative contribution of TASK-1 vs TASK-3 in thalamocortical neurons not fully resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Distinguishing two modes of GPCR regulation — gating vs. trafficking: PKC was shown to drive 14-3-3β-dependent endocytic internalization of TASK-1 via a novel endocytic motif (acute trafficking regulation), while in cardiomyocytes ET-1 inhibited TASK-1 gating through PLC independently of PKC, indicating cell-type-specific regulatory mechanisms.\",\n      \"evidence\": \"Surface biotinylation and siRNA of 14-3-3β in cerebellar neurons; patch clamp with PKC/rho kinase inhibitors in rat cardiomyocytes\",\n      \"pmids\": [\"22846993\", \"22977011\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The endocytic motif sequence and its relationship to the 14-3-3 binding site not fully mapped\", \"Whether trafficking and gating regulation co-occur in the same cell type unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying DAG as the direct second messenger and linking channel phosphorylation to atrial fibrillation: DAG (not PIP2 depletion or IP3/Ca2+) was established as the signal mediating Gq-coupled GPCR inhibition of TASK channels, and phosphorylation-dependent TASK-1 loss of function was demonstrated in human AF tissue.\",\n      \"evidence\": \"DAG kinase/lipase manipulation with fluorescent reporters in heterologous cells; patch clamp with intracellular phosphatase rescue in human AF myocytes\",\n      \"pmids\": [\"25420509\", \"25437921\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The DAG binding site on TASK-1 not identified\", \"The specific kinase and phosphorylation site responsible for AF-associated inhibition not determined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Establishing KCNK3 loss of function as a driver of pulmonary hypertension pathobiology: reduced KCNK3 expression/function in human PAH and animal models was shown to cause PASMC/endothelial proliferation, vasoconstriction, and inflammation, with in vivo pharmacological activation reversing experimental PH.\",\n      \"evidence\": \"Patch clamp in freshly isolated PASMCs, siRNA, monocrotaline rat model with pharmacological rescue\",\n      \"pmids\": [\"26912814\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of KCNK3 downregulation in PAH not established\", \"Whether pharmacological activation is sufficient in genetic forms of PAH unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Genetic proof that KCNK3 loss causes spontaneous pulmonary hypertension: CRISPR-generated Kcnk3-null rats developed age-dependent PH with membrane depolarization, overactivation of ERK1/2, AKT, SRC, and HIF1-α overexpression, defining the downstream signaling cascade.\",\n      \"evidence\": \"CRISPR/Cas9 knockout rat with comprehensive hemodynamic, electrophysiological, and signaling pathway analysis\",\n      \"pmids\": [\"31347976\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the signaling cascade is a direct consequence of depolarization or involves KCNK3-specific protein interactions unknown\", \"Therapeutic targeting of these downstream pathways not tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Structural basis of gating and drug trapping resolved: the X-ray crystal structure revealed an intramembrane X-gate (VLRFMT at M4 helix crossing) that controls channel open probability; high-affinity inhibitors bind below the selectivity filter and are physically trapped by X-gate closure.\",\n      \"evidence\": \"X-ray crystallography with inhibitor co-crystal structures, validated by mutagenesis and electrophysiology\",\n      \"pmids\": [\"32499642\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How GPCR signaling is transduced to the X-gate conformationally not determined\", \"Structure of the open state not available\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Gain-of-function X-gate mutations were shown to cause a developmental disorder with sleep apnea (DDSA), producing overactive channels insensitive to GPCR-mediated inhibition but still responsive to pharmacological blockers, establishing a new disease mechanism.\",\n      \"evidence\": \"Patch clamp and mutagenesis in heterologous systems with GPCR inhibition assays, published in Nature Genetics\",\n      \"pmids\": [\"36195757\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific pathophysiology of GOF variants not characterized in vivo\", \"Whether pharmacological rescue translates to therapeutic benefit untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for DAG-mediated channel inhibition, the conformational mechanism linking GPCR signaling to X-gate closure, the identity of the kinase and phosphorylation site underlying AF-associated TASK-1 inhibition, and whether combined pharmacological activation strategies can treat both LOF (PAH) and GOF (DDSA) KCNK3 channelopathies.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"DAG binding site on TASK-1 unknown\", \"Open-state channel structure unavailable\", \"Phosphorylation site(s) mediating AF-associated inhibition not mapped\", \"In vivo pharmacological rescue of GOF variants not tested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [2, 3, 7, 28]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 4, 11, 30]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0162582\", \"supporting_discovery_ids\": [1, 8, 9, 10]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 8, 9, 10]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [2, 3, 7, 28]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [7, 14, 15, 16]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [19, 21, 26]}\n    ],\n    \"complexes\": [\n      \"TASK-1/TASK-3 heterodimer\"\n    ],\n    \"partners\": [\n      \"S100A10\",\n      \"YWHAB\",\n      \"KCNK9\",\n      \"KCNK17\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}