{"gene":"KCNK3","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":2001,"finding":"TASK-1 and TASK-3 form functional heterodimers when coexpressed in Xenopus oocytes, producing channels with intermediate pH sensitivity and ruthenium-red insensitivity characteristic of TASK-1 homodimers; tandem-linked TASK-3/TASK-1 constructs recapitulate this behavior and show intermediate inhibition by AT1a angiotensin II receptor stimulation.","method":"Xenopus oocyte electrophysiology, tandem-construct expression, epitope-tagged channel localization in mammalian cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — functional reconstitution in oocytes, tandem constructs, pharmacological discrimination, replicated by multiple subsequent labs","pmids":["11733509"],"is_preprint":false},{"year":2002,"finding":"Both volatile anesthetic activation (halothane) and neurotransmitter/TRH inhibition of TASK-1 require a six-residue sequence at the cytoplasmic C-terminus immediately following the last transmembrane domain (M4); mutations in this region virtually abolish both effects. A potential phosphorylation site within this region is not required for modulation.","method":"Site-directed mutagenesis, two-electrode voltage-clamp in Xenopus oocytes, tandem heterodimer constructs","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis combined with reconstitution in oocytes, tested on both TASK-1 and tandem heterodimers with multiple modulatory agents","pmids":["11886861"],"is_preprint":false},{"year":2001,"finding":"TASK-1 is inhibited by Gq-coupled receptor stimulation (LPA, ANG II via AT1a, carbachol via M1) through a phospholipase C (PLC)-dependent mechanism; downstream PLC signals (IP3, Ca2+, DAG) are not the mediators. Gi-coupled M2 receptor activation has minimal effect unless PLC-β2 is co-expressed, implicating PLC activity (not Gi per se) as the key step.","method":"Xenopus oocyte two-electrode voltage clamp, GTPγS injection, PLC inhibitor U-73122, co-expression of receptor and PLC-β2 constructs","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution in oocytes with multiple receptor types, pharmacological dissection, and PLC overexpression rescue","pmids":["11443069"],"is_preprint":false},{"year":2004,"finding":"TASK-1 and TASK-3 subunits coassemble into heterodimeric channels in mammalian cells, as shown by co-immunoprecipitation; a dominant-negative TASK-1(Y191F) construct suppresses TASK-3 currents. Heteromeric TASK-1/TASK-3 channels in hypoglossal motoneurons have pH sensitivity (~pK 7.3) and isoflurane sensitivity intermediate between the two homomers, providing a substantial component of native background K+ current.","method":"Co-immunoprecipitation from transfected mammalian cell membranes, dominant-negative expression, tandem-construct electrophysiology, patch-clamp in hypoglossal motoneuron slices, ruthenium red pharmacology","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — co-IP, dominant-negative, native neuron patch-clamp, tandem constructs across multiple approaches; independently replicated","pmids":["15282272"],"is_preprint":false},{"year":2004,"finding":"HIV-1 Vpu physically interacts with TASK-1 in cultured cells and in AIDS lymphoid tissues; Vpu abolishes TASK-1 current, while TASK-1 overexpression impairs Vpu-mediated viral particle release. The N-terminal 40 amino acids of TASK-1 (homologous to Vpu) can enhance HIV-1 particle release.","method":"Co-immunoprecipitation from cultured cells and lymphoid tissue, electrophysiological recording of TASK-1 currents, HIV-1 particle release assay","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal functional and binding assays in cells and native tissue, single lab","pmids":["15099524"],"is_preprint":false},{"year":2006,"finding":"In human pulmonary artery smooth muscle cells (PASMCs), TASK-1 controls resting membrane potential; siRNA knockdown depolarizes PASMCs and abolishes sensitivity to anandamide, acidosis, alkalosis, hypoxia, and treprostinil. Treprostinil activates TASK-1 via PKA-dependent phosphorylation.","method":"Whole-cell patch-clamp, TASK-1 siRNA knockdown in primary human PASMCs, membrane potential measurements","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — siRNA loss-of-function with multiple pharmacological readouts in primary human cells, PKA pathway pharmacology, replicated by subsequent studies","pmids":["16574908"],"is_preprint":false},{"year":2007,"finding":"Forward trafficking of K2P3.1 (TASK-1) to the plasma membrane requires 14-3-3 protein binding, which suppresses COPI-mediated ER retention. The channel uses two separate COPI-binding sites (N- and C-termini); disrupting either interferes with ER retention. p11 binds the C-terminal retention motif in a 14-3-3-dependent manner and modulates forward transport in a subset of tissues.","method":"Biochemical binding assays, co-immunoprecipitation, electrophysiology, subcellular localization by immunofluorescence in mammalian cells","journal":"Traffic (Copenhagen, Denmark)","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (binding, localization, functional electrophysiology, mutant constructs) in single focused study","pmids":["17908283"],"is_preprint":false},{"year":2009,"finding":"TASK-1 current in human PASMCs is inhibited by ET-1 through ETA receptors acting via phospholipase C, PIP2, DAG, and protein kinase C, leading to phosphorylation of TASK-1 and membrane depolarization. siRNA knockdown of TASK-1 abolishes ET-1–induced depolarization.","method":"Whole-cell patch-clamp in primary hPASMCs, TASK-1 siRNA, pharmacological dissection of PLC/PKC pathway, isolated perfused mouse lung","journal":"American journal of respiratory cell and molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — siRNA plus sequential pharmacological pathway dissection in primary human cells, functionally validated in an intact organ model","pmids":["19188660"],"is_preprint":false},{"year":2009,"finding":"TASK-1 current in heterologous systems and human PASMCs is inhibited by ET-1 through both ETA (IC50=0.08 nM) and ETB (IC50=0.23 nM) receptors via Rho kinase signaling. Phosphorylation of Ser393 on TASK-1 is required for ETA- and ETB-mediated inhibition; Ser336 mutation selectively attenuates ETA-dependent regulation only.","method":"Two-electrode voltage clamp in Xenopus oocytes, whole-cell patch-clamp in hPASMCs, site-directed mutagenesis of Ser393 and Ser336, Rho kinase inhibitor Y-27632","journal":"British journal of pharmacology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis identifies specific phosphorylation sites, complemented by receptor pharmacology in oocytes and native cells","pmids":["21838752"],"is_preprint":false},{"year":2009,"finding":"TASK-1 channels are functionally expressed in adrenal glomerulosa H295R cells; siRNA knockdown of TASK-1 increases intracellular Ca2+, activates calmodulin kinase (CaMK), upregulates StAR and CYP11B2 expression, and stimulates pregnenolone and aldosterone production, placing TASK-1 upstream of Ca2+/CaMK aldosterone regulation.","method":"siRNA knockdown in H295R cells, Fluo-4 Ca2+ imaging, CaMK pharmacological inhibition, steroid production assays, microarray","journal":"Clinical endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA loss-of-function with multiple downstream readouts, Ca2+ imaging, and pharmacological rescue, single lab","pmids":["19878209"],"is_preprint":false},{"year":2011,"finding":"PKA (cAMP-dependent protein kinase) is the kinase responsible for phosphorylating Ser393 of K2P3.1 (TASK-1), enabling 14-3-3 binding and forward transport to the plasma membrane; in vitro phosphorylation assays and cell-surface expression assays confirmed PKA as the relevant kinase over RSK and PKC.","method":"In vitro phosphorylation assays, electrophysiology of HEK293-expressed K2P3.1, cell-surface GFP-channel flow cytometry assays, bioinformatics","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay plus functional cell-surface quantification, multiple kinases ruled out","pmids":["21357689"],"is_preprint":false},{"year":2012,"finding":"PKC activation (by phorbol esters or group I mGluR stimulation) acutely internalizes TASK-1 (KCNK3) from the cell surface via a mechanism requiring both 14-3-3β and a novel endocytic motif in the channel; depleting either 14-3-3β or ablating the endocytic motif abolishes PKC-regulated trafficking.","method":"Patch-clamp in cerebellar granule neurons and cell lines, phorbol ester treatment, mGluR agonist, 14-3-3β siRNA depletion, endocytic motif mutagenesis, surface biotinylation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacological dissection in both native neurons and recombinant systems, multiple orthogonal methods","pmids":["22846993"],"is_preprint":false},{"year":2012,"finding":"N-linked glycosylation of K2P3.1 (TASK-1) at its conserved glycan acceptor site is required for normal cell-surface expression; disruption of glycosylation reduces TASK-1 current and decreases the number of channels at the plasma membrane without grossly altering secretory pathway passage.","method":"Patch-clamp electrophysiology, flow cytometry of surface channels, mutagenesis of N-glycosylation site, glycosylation inhibitors, reduced glucose culture","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional and surface quantification, mutagenesis, pharmacological inhibition, single lab","pmids":["23250752"],"is_preprint":false},{"year":2014,"finding":"The endosomal SNARE protein syntaxin-8 physically interacts with TASK-1 and promotes clathrin-mediated cooperative endocytosis, reducing TASK-1 surface expression ~fourfold; TASK-1 colocalizes with syntaxin-8 in early endosomes (2xFYVE/rab5-positive). Both an endocytosis signal in TASK-1 and one in syntaxin-8 are required for this effect.","method":"Co-expression in Xenopus oocytes and mammalian cells, co-immunoprecipitation, TIRF microscopy of clathrin/TASK-1/syntaxin-8 vesicles, endosomal colocalization, endocytosis signal mutagenesis","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, live TIRF imaging, mutagenesis of both partners, functional current measurements, single lab with orthogonal methods","pmids":["24743596"],"is_preprint":false},{"year":2016,"finding":"14-3-3 binding to the TASK-1 C-terminal trafficking control region is controlled by dual phosphorylation: phosphorylation of the primary serine prevents COPI binding even in the absence of 14-3-3, while phosphorylation of a second serine residue inhibits 14-3-3 binding, creating a switch that can either promote or inhibit surface expression depending on which site is phosphorylated. 14-3-3 affinities for TASK-1 are ~100-fold lower than for TASK-3.","method":"Quantitative binding assays with all human 14-3-3 isoforms, phosphopeptide competition, co-immunoprecipitation, electrophysiology","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 / Moderate — quantitative biochemical binding assays for all 14-3-3 isoforms, phosphomimetic/phosphoablative mutants, functional readout, single lab with multiple rigorous methods","pmids":["26743085"],"is_preprint":false},{"year":2004,"finding":"In cerebellar granule cells, native 38-pS background K+ channels consist of both homomeric TASK-3 and heteromeric TASK-1/TASK-3, distinguished by differential sensitivity to ruthenium red and extracellular pH; ~58% of patches show ruthenium-red-insensitive (TASK-1/TASK-3-like) conductance.","method":"Single-channel patch-clamp in cerebellar granule neurons and COS-7 cells expressing cloned channels, ruthenium red pharmacology, pH sensitivity","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — single-channel biophysics with pharmacological discrimination in native cells, replicated across multiple studies","pmids":["14678492"],"is_preprint":false},{"year":2010,"finding":"PKG activation dynamically upregulates TASK-1 leak currents in cholinergic basal forebrain neurons by reducing the channel's proton-binding affinity (increasing Kd for H+), shifting pH sensitivity; this modulation requires the extracellular pH sensor H98, as H98 mutation abolishes PKG-dependent regulation.","method":"Patch-clamp in PKG-loaded HEK293 cells expressing TASK-1, site-directed mutagenesis of H98, patch-clamp in identified cholinergic basal forebrain neurons","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis identifying specific residue plus PKG loading in both heterologous and identified native neurons, single lab","pmids":["20410120"],"is_preprint":false},{"year":2004,"finding":"Pore-flanking histidine H98 of TASK-1 contributes to both pH sensing and to the structure of the ion conduction pathway; H98D and H98N mutations reduce K+ selectivity, increase Rb+ permeability, and alter the voltage-dependence of Ba2+ block, indicating that H98 influences selectivity filter structure.","method":"Site-directed mutagenesis, two-electrode voltage clamp in Xenopus oocytes, ion selectivity and Ba2+/Cs+ block measurements","journal":"The Journal of physiology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — mutagenesis with biophysical characterization, single lab, single study","pmids":["15611021"],"is_preprint":false},{"year":2009,"finding":"Heteromeric TASK-1/TASK-3 channels are the predominant (~75%) oxygen-sensitive background K+ channel in rat carotid body glomus cells, identified by single-channel conductance profiling and differential sensitivity to Mg2+, ruthenium red, and methanandamide; hypoxia inhibits TASK-1/TASK-3-like channels in these cells.","method":"Single-channel outside-out and cell-attached patch-clamp in isolated carotid body cells and HeLa cells expressing cloned channels, Mg2+ removal conductance shifts, ruthenium red pharmacology","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — rigorous single-channel biophysics with multiple pharmacological discriminators in native cells compared with cloned channels, single lab","pmids":["19403596"],"is_preprint":false},{"year":2015,"finding":"TASK-1 channels expressed in pancreatic α-cells limit Ca2+ entry and glucagon secretion by maintaining membrane hyperpolarization; inhibition (A1899) or genetic ablation of α-cell TASK-1 increases electrical excitability and Ca2+ influx under high glucose, elevating glucagon secretion. Mice with α-cell-specific TASK-1 deletion show improved glucose inhibition of glucagon secretion.","method":"Patch-clamp electrophysiology in human and mouse α-cells, α-cell-specific conditional TASK-1 knockout mice, Ca2+ imaging, glucagon secretion assays, TASK-1 inhibitor A1899","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional KO plus pharmacological inhibition with multiple cellular readouts in both human and mouse cells, single lab","pmids":["25849724"],"is_preprint":false},{"year":2015,"finding":"In human atrial cardiomyocytes, single-channel recordings reveal a ~55-pS channel consistent with TASK-1/TASK-3 heteromers; co-expression and tandem-construct experiments in HEK293 cells and Xenopus oocytes confirm that TASK-1/TASK-3 heteromers have a predominant surface expression and reduced affinity for TASK-1-selective blockers compared with homomers.","method":"Cell-attached single-channel patch-clamp of human right auricle cardiomyocytes, TASK-1/TASK-3 tandem constructs and co-expression in HEK293/oocytes, immunocytochemistry","journal":"Journal of molecular and cellular cardiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — native single-channel recordings plus heterologous reconstitution, single lab, pharmacological validation","pmids":["25655935"],"is_preprint":false},{"year":2019,"finding":"Sp1 transcription factor upregulates p11 (S100A10) expression, which in turn reduces functional TASK-1 expression at the plasma membrane, increasing neuronal excitability. In the SOD1-G93A ALS mouse model, Sp1-p11-TASK1 dysregulation contributes to motor neuron hyperexcitability and degeneration; knockdown of either Sp1 or p11 is neuroprotective.","method":"Sp1 and p11 siRNA/overexpression, SOD1-G93A mouse model, patch-clamp recordings, immunofluorescence of channel surface expression, nitrosative stress stimulation of Sp1 promoter","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function in neurons with defined pathway (Sp1→p11→TASK-1 surface expression), in vivo model, multiple orthogonal methods, single lab","pmids":["31439839"],"is_preprint":false},{"year":2020,"finding":"X-ray crystal structure of TASK-1 reveals a lower 'X-gate' formed by the crossed C-terminal M4 helices (residues 243VLRFMT248); this gate controls channel open probability and responds to volatile anesthetics and GPCR signals. X-gate mutations alter open probability and anesthetic response. Two high-affinity inhibitors bind below the selectivity filter and are trapped in the vestibule by the closed X-gate, explaining their exceptionally slow washout.","method":"X-ray crystallography of TASK-1 alone and in complex with two inhibitors, site-directed mutagenesis of X-gate residues, electrophysiological functional validation","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structures with bound inhibitors plus mutagenesis and functional electrophysiology, published in Nature","pmids":["32499642"],"is_preprint":false},{"year":2022,"finding":"De novo gain-of-function mutations in KCNK3 cluster around the X-gate and produce constitutively overactive TASK-1 channels that no longer respond to inhibition by G-protein-coupled receptor pathways, causing a developmental disorder with sleep apnea (DDSA). Despite defective X-gating, these channels remain sensitive to pharmacological TASK channel inhibitors.","method":"Patch-clamp electrophysiology of mutant TASK-1 in heterologous cells, GPCR pathway modulation assays, pharmacological inhibitor screening, clinical genetics","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — electrophysiological characterization of multiple patient mutations, X-gate mechanistic connection established by crystal structure context, pharmacological rescue demonstrated","pmids":["36195757"],"is_preprint":false},{"year":2014,"finding":"TASK-1 current in atrial myocytes from humans and canines with chronic atrial fibrillation is absent despite unchanged or slightly increased total TASK-1 protein; addition of phosphatase to the patch pipette restores TASK-1 current, indicating that phosphorylation-dependent inhibition (not downregulation of protein) accounts for loss of current in chronic AF.","method":"Patch-clamp of isolated human and canine atrial myocytes, intrapipette phosphatase application, Western blot of total TASK-1 protein","journal":"American journal of physiology. Heart and circulatory physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphatase rescue directly implicates phosphorylation as functional mechanism, matched human and canine samples, single lab","pmids":["25437921"],"is_preprint":false},{"year":2015,"finding":"TASK-1 knockdown in the NSCLC cell line A549 (which expresses functional, pH- and hypoxia-sensitive TASK-1 currents) significantly enhances apoptosis and reduces proliferation; this effect is absent in weakly expressing NCI-H358 cells, indicating a cell-context-dependent role for TASK-1 in cancer cell survival.","method":"siRNA knockdown, patch-clamp electrophysiology in A549 cells, apoptosis and proliferation assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA loss-of-function with functional electrophysiological validation plus cell biology readouts, single lab","pmids":["27294516"],"is_preprint":false},{"year":2012,"finding":"Reactive oxygen species (H2O2 at millimolar concentrations applied intracellularly) activate TASK-1, TASK-3, and TASK-1/TASK-3 heteromers in inside-out patches, but extracellular or superoxide-generating ROS do not inhibit TASK channels; thus ROS are unlikely to be the hypoxic signal mediating TASK inhibition in chemoreceptor cells.","method":"Inside-out, cell-attached, and outside-out patch-clamp in HeLa cells, carotid body glomus cells, adrenal cells, and cerebellar granule neurons; xanthine/XO superoxide generation; DTT and MTSEA treatment","journal":"Pflugers Archiv : European journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — negative finding with rigorous biophysical methods across multiple cell types and cloned channels, single lab","pmids":["23007462"],"is_preprint":false},{"year":2015,"finding":"TASK-1 K+ channel modulates β-adrenergic thermogenic response in brown adipocytes; Task1-null mice develop BAT whitening and impaired β3-adrenergic response (decreased O2 consumption, UCP1 expression, lipolysis). This phenotype is mediated by exacerbated mineralocorticoid receptor (MR) signaling, as it is mimicked by corticoids and reversed by an MR inhibitor.","method":"Task1 knockout mice, brown adipocyte isolation and differentiation, oxygen consumption assays, MR pharmacological inhibition/corticoid stimulation, Ucp1 expression measurements","journal":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO phenotype with pharmacological rescue via MR pathway, multiple cellular readouts, single lab","pmids":["26527067"],"is_preprint":false},{"year":2019,"finding":"Doxapram inhibits human TASK-1 and TASK-3 channels equipotently; mutations of hydrophobic residues in the pore-lining region or removal of the TASK-3 C-terminus attenuate doxapram inhibition but not zinc block, indicating an intracellular/pore-lining binding site distinct from the extracellular zinc site. The positive enantiomer GAL-054 is more potent than doxapram; the negative enantiomer GAL-053 has little effect.","method":"Whole-cell patch-clamp in tsA201 cells, site-directed mutagenesis of pore-lining residues, C-terminus deletion constructs, chirally separated enantiomers","journal":"Acta physiologica (Oxford, England)","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — mutagenesis identifies binding determinants, enantioselective pharmacology, single lab","pmids":["31423744"],"is_preprint":false},{"year":2018,"finding":"PAH-associated TASK-1 missense mutations G106R and L214R reduce channel current markedly despite normal plasma membrane localization (confirmed by confocal microscopy and in-cell/on-cell westerns); WT TASK-1 is activated by riociguat (guanylate cyclase activator), but neither pH 8.4, ONO-RS-082, nor riociguat restores current through these mutant channels.","method":"Whole-cell patch-clamp in tsA201 cells, confocal microscopy, in-cell and on-cell western quantification","journal":"The Journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods for surface vs. current dissociation, tested with multiple activators, single lab","pmids":["30365877"],"is_preprint":false}],"current_model":"KCNK3/TASK-1 is a constitutively active two-pore domain background K+ channel that sets resting membrane potential in neurons, cardiomyocytes, and vascular/endocrine cells; it functions as a homodimer or heterodimer with TASK-3, is gated by an 'X-gate' formed by crossed C-terminal M4 helices (structure resolved by X-ray crystallography), and is regulated by extracellular pH (via pore-flanking H98), volatile anesthetics and GPCR/neurotransmitter signals acting on the proximal cytoplasmic C-terminus, PKC-triggered 14-3-3β-dependent endocytosis, PKA-dependent phosphorylation of Ser393 enabling 14-3-3-mediated ER export, Rho kinase phosphorylation downstream of endothelin receptors, PKG-dependent modulation of proton binding, PLC-dependent inhibition downstream of Gq-coupled receptors, syntaxin-8-mediated cooperative clathrin endocytosis, and N-linked glycosylation controlling surface stability; gain-of-function X-gate mutations cause a developmental disorder with sleep apnea, while loss-of-function variants underlie heritable pulmonary arterial hypertension by depolarizing pulmonary vascular cells and promoting their proliferation."},"narrative":{"mechanistic_narrative":"KCNK3 (TASK-1) is a two-pore-domain background potassium channel that sets the resting membrane potential of neurons, cardiomyocytes, vascular smooth muscle, and endocrine cells, where its constitutive K+ leak constrains excitability, Ca2+ entry, and downstream secretory and proliferative responses [PMID:15282272, PMID:16574908, PMID:25849724]. It assembles as a homodimer or as TASK-1/TASK-3 heterodimers that produce native background currents of intermediate pH and pharmacological sensitivity in motoneurons, cerebellar granule cells, carotid body glomus cells, and atrial myocytes [PMID:11733509, PMID:15282272, PMID:14678492, PMID:19403596, PMID:25655935]. Channel gating is governed by a lower 'X-gate' formed by the crossed C-terminal M4 helices (residues 243-248), which controls open probability and serves as the convergence point for volatile anesthetics and GPCR signals; high-affinity inhibitors bind below the selectivity filter and are trapped in the vestibule by the closed gate [PMID:32499642, PMID:11886861]. Conduction and proton sensing depend on the pore-flanking histidine H98, which both reports extracellular pH and shapes selectivity-filter structure [PMID:20410120, PMID:15611021]. TASK-1 activity is extensively tuned by signaling: Gq-coupled receptors inhibit it through phospholipase C [PMID:11443069], endothelin-1 inhibits it via PKC- and Rho-kinase-dependent phosphorylation of Ser393 (and Ser336 for ETA-selective regulation) leading to depolarization [PMID:19188660, PMID:21838752], PKG raises proton-binding Kd to upregulate current [PMID:20410120], and PKA-mediated treprostinil signaling activates it [PMID:16574908]. Surface density is set by a trafficking program in which phosphorylation of Ser393 by PKA licenses 14-3-3 binding to suppress COPI-mediated ER retention and promote forward transport, with a second phosphosite acting as a switch and p11 (S100A10) modulating delivery [PMID:21357689, PMID:17908283, PMID:26743085]; PKC triggers 14-3-3β-dependent endocytosis through a dedicated endocytic motif [PMID:22846993], syntaxin-8 drives clathrin-mediated cooperative internalization from early endosomes [PMID:24743596], and N-linked glycosylation stabilizes channels at the plasma membrane [PMID:23250752]. Through this regulatory architecture TASK-1 contributes to oxygen sensing in the carotid body [PMID:19403596], pulmonary vascular tone where loss-of-function impairs hyperpolarization and promotes PASMC proliferation [PMID:16574908, PMID:30365877], glucagon secretion in pancreatic α-cells [PMID:25849724], and aldosterone production in adrenal glomerulosa cells [PMID:19878209]. Gain-of-function mutations clustered at the X-gate produce constitutively overactive, GPCR-unresponsive channels causing a developmental disorder with sleep apnea, while loss-of-function missense variants (G106R, L214R) that retain normal surface localization underlie heritable pulmonary arterial hypertension [PMID:36195757, PMID:30365877].","teleology":[{"year":2001,"claim":"Established that TASK-1 does not act alone but coassembles with TASK-3 into heterodimeric channels, explaining the intermediate biophysical properties of native background currents.","evidence":"Xenopus oocyte electrophysiology with tandem TASK-3/TASK-1 constructs and pharmacological discrimination","pmids":["11733509"],"confidence":"High","gaps":["Stoichiometry and subunit arrangement not resolved at this stage","Physiological tissues where heterodimers dominate not yet defined"]},{"year":2001,"claim":"Defined how Gq-coupled receptors inhibit TASK-1, showing the signal proceeds through phospholipase C rather than canonical downstream second messengers.","evidence":"Two-electrode voltage clamp in oocytes with GTPγS, U-73122, and PLC-β2 co-expression rescue","pmids":["11443069"],"confidence":"High","gaps":["Direct molecular effector linking PLC to the channel not identified","PIP2 versus other lipid involvement unresolved here"]},{"year":2002,"claim":"Mapped the channel region required for both anesthetic activation and neurotransmitter inhibition to a six-residue cytoplasmic stretch immediately after M4, localizing modulatory control to the proximal C-terminus.","evidence":"Site-directed mutagenesis and voltage-clamp in oocytes using multiple modulatory agents","pmids":["11886861"],"confidence":"High","gaps":["How this region couples to the gate was not structurally explained","Putative phosphosite shown dispensable but mechanism left open"]},{"year":2004,"claim":"Confirmed physical TASK-1/TASK-3 coassembly and demonstrated its functional contribution to native background current in motoneurons and cerebellar granule cells.","evidence":"Co-IP, dominant-negative TASK-1(Y191F), single-channel and slice patch-clamp with ruthenium red and pH discrimination","pmids":["15282272","14678492"],"confidence":"High","gaps":["Proportion of homo- versus heterodimers tissue-by-tissue incompletely quantified","Assembly determinants on the subunits not mapped"]},{"year":2004,"claim":"Showed that the pore-flanking histidine H98 is dual-purpose, sensing extracellular pH while also shaping selectivity-filter structure and ion permeation.","evidence":"H98 mutagenesis with ion selectivity and Ba2+ block measurements in oocytes","pmids":["15611021"],"confidence":"Medium","gaps":["Single lab, single study","Structural basis for filter coupling not directly visualized"]},{"year":2004,"claim":"Identified TASK-1 as an HIV-1 Vpu interaction partner, with reciprocal functional antagonism between channel and viral protein.","evidence":"Co-IP from cells and lymphoid tissue, current recordings, and HIV-1 particle-release assays","pmids":["15099524"],"confidence":"Medium","gaps":["Single lab","Physiological relevance to infection in vivo not established"]},{"year":2006,"claim":"Placed TASK-1 at the center of pulmonary vascular membrane potential control, showing its leak current mediates responses to acidosis, hypoxia, and prostacyclin analogs.","evidence":"siRNA knockdown and whole-cell patch-clamp in primary human PASMCs with PKA pathway pharmacology","pmids":["16574908"],"confidence":"High","gaps":["Direct molecular link from PKA to channel activation not mapped here","Hypoxia-sensing mechanism left unresolved"]},{"year":2007,"claim":"Defined the forward-trafficking logic of TASK-1, in which 14-3-3 binding overrides dual COPI-mediated ER retention to permit surface delivery, with p11 as a tissue-selective modulator.","evidence":"Binding assays, co-IP, immunofluorescence localization, and electrophysiology in mammalian cells","pmids":["17908283"],"confidence":"High","gaps":["Kinase generating the 14-3-3 signal not yet identified at this stage","Tissue specificity of p11 effect not fully delineated"]},{"year":2009,"claim":"Dissected endothelin-1 inhibition of TASK-1 into convergent kinase pathways, identifying Ser393 as the critical phosphoacceptor and Ser336 as an ETA-selective site.","evidence":"Patch-clamp in hPASMCs and oocytes, Ser393/Ser336 mutagenesis, Rho-kinase and PLC/PKC pharmacology, perfused lung","pmids":["19188660","21838752"],"confidence":"High","gaps":["Whether PKC and Rho-kinase act on the same or distinct residues partly unresolved","In vivo contribution to PAH not directly tested here"]},{"year":2009,"claim":"Extended TASK-1's role to endocrine control, placing it upstream of Ca2+/CaMK-driven aldosterone production in adrenal glomerulosa cells.","evidence":"siRNA knockdown in H295R cells with Ca2+ imaging, CaMK inhibition, and steroidogenesis assays","pmids":["19878209"],"confidence":"Medium","gaps":["Single lab in a cell line","In vivo adrenal phenotype not established here"]},{"year":2009,"claim":"Identified heteromeric TASK-1/TASK-3 as the dominant oxygen-sensitive background channel in carotid body glomus cells, linking the channel to peripheral chemoreception.","evidence":"Single-channel patch-clamp in isolated glomus cells versus cloned channels with multiple pharmacological discriminators","pmids":["19403596"],"confidence":"High","gaps":["Molecular identity of the hypoxia transducer acting on the channel unknown","Direct versus indirect O2 sensing unresolved"]},{"year":2010,"claim":"Revealed a PKG-dependent mechanism that upregulates TASK-1 by lowering proton-binding affinity, acting through the H98 pH sensor.","evidence":"PKG-loaded HEK293 cells and identified cholinergic neurons with H98 mutagenesis","pmids":["20410120"],"confidence":"Medium","gaps":["Direct phosphorylation site for PKG effect not mapped","Single lab"]},{"year":2011,"claim":"Identified PKA as the kinase that phosphorylates Ser393 to enable 14-3-3 binding and forward transport, connecting cAMP signaling to channel surface density.","evidence":"In vitro kinase assays and cell-surface flow cytometry of GFP-channels, ruling out RSK and PKC","pmids":["21357689"],"confidence":"High","gaps":["Subcellular compartment of PKA action not defined","Cross-talk with the inhibitory ET-1/Ser393 axis not reconciled"]},{"year":2012,"claim":"Showed that PKC drives rapid 14-3-3β-dependent endocytosis of TASK-1 via a dedicated endocytic motif, establishing a regulated removal arm complementing forward trafficking.","evidence":"Patch-clamp in granule neurons and cell lines, 14-3-3β siRNA, endocytic motif mutagenesis, surface biotinylation","pmids":["22846993"],"confidence":"High","gaps":["Endocytic adaptor machinery not fully defined here","Relationship to PKC-mediated current inhibition not separated"]},{"year":2012,"claim":"Established N-linked glycosylation as a determinant of TASK-1 surface stability rather than secretory transit.","evidence":"Patch-clamp, surface flow cytometry, glycosite mutagenesis, and glycosylation inhibitors","pmids":["23250752"],"confidence":"Medium","gaps":["Single lab","Mechanism of surface stabilization by glycan not defined"]},{"year":2012,"claim":"Tested and rejected ROS as the inhibitory hypoxic signal for TASK channels, refining models of chemoreceptor oxygen sensing.","evidence":"Inside-out and outside-out patch-clamp across multiple native cell types and cloned channels with superoxide generation","pmids":["23007462"],"confidence":"Medium","gaps":["Identity of the true hypoxic signal remains unknown","Negative finding from a single lab"]},{"year":2014,"claim":"Demonstrated that syntaxin-8 physically binds TASK-1 and promotes clathrin-mediated cooperative endocytosis from early endosomes, adding a SNARE-dependent route of surface removal.","evidence":"Co-IP, TIRF imaging of clathrin/channel/syntaxin-8 vesicles, endosomal colocalization, and dual endocytosis-signal mutagenesis","pmids":["24743596"],"confidence":"High","gaps":["Single lab","How syntaxin-8 and 14-3-3β pathways are coordinated unknown"]},{"year":2014,"claim":"Showed that loss of TASK-1 current in chronic atrial fibrillation arises from phosphorylation-dependent inhibition rather than protein downregulation, distinguishing functional from expression-level regulation in disease.","evidence":"Patch-clamp of human and canine AF atrial myocytes with intrapipette phosphatase rescue and total-protein westerns","pmids":["25437921"],"confidence":"Medium","gaps":["Responsible kinase/phosphosite in AF not identified","Single lab"]},{"year":2015,"claim":"Established physiological roles for TASK-1 in metabolic and endocrine tissues, controlling glucagon secretion in α-cells and β-adrenergic thermogenesis in brown adipose tissue.","evidence":"α-cell-specific and global Task1 knockout mice, patch-clamp, Ca2+ imaging, secretion and thermogenesis assays with MR pharmacology","pmids":["25849724","26527067"],"confidence":"High","gaps":["BAT phenotype mechanism via mineralocorticoid receptor is correlative","Cell-autonomous versus systemic contributions to thermogenesis not fully separated"]},{"year":2015,"claim":"Reinforced the heteromeric identity of native cardiac background channels and showed TASK-1/TASK-3 heteromers dominate surface expression with altered blocker sensitivity.","evidence":"Single-channel patch-clamp of human atrial myocytes plus tandem/co-expression constructs in HEK293 and oocytes","pmids":["25655935"],"confidence":"Medium","gaps":["Single lab","In vivo cardiac consequence of heteromer dominance not tested"]},{"year":2016,"claim":"Resolved the trafficking switch logic, showing dual phosphorylation can either license or block 14-3-3 binding, and that TASK-1 binds 14-3-3 ~100-fold weaker than TASK-3.","evidence":"Quantitative binding assays with all 14-3-3 isoforms, phosphopeptide competition, co-IP, and electrophysiology","pmids":["26743085"],"confidence":"High","gaps":["Kinases targeting the second serine in vivo not identified","Functional consequence of weaker 14-3-3 affinity for heterodimers unresolved"]},{"year":2018,"claim":"Showed that PAH-associated G106R and L214R variants abolish current despite normal surface trafficking, defining a conduction/gating loss-of-function mechanism resistant to pharmacological activation.","evidence":"Patch-clamp, confocal microscopy, and in-cell/on-cell westerns with multiple activators in tsA201 cells","pmids":["30365877"],"confidence":"Medium","gaps":["Structural basis of current loss not directly visualized","Single lab"]},{"year":2019,"claim":"Defined a transcriptional-to-surface regulatory axis (Sp1→p11→TASK-1) that lowers channel surface expression to drive neuronal hyperexcitability, implicated in ALS motor neuron degeneration.","evidence":"Sp1/p11 siRNA and overexpression, SOD1-G93A mice, patch-clamp, and surface immunofluorescence","pmids":["31439839"],"confidence":"Medium","gaps":["Single lab","Direct causality of TASK-1 reduction in human ALS not established"]},{"year":2019,"claim":"Localized the doxapram/GAL-054 inhibitory site to the intracellular pore-lining region, distinct from the extracellular zinc site, with enantioselective potency.","evidence":"Whole-cell patch-clamp, pore-lining mutagenesis, C-terminus deletion, and chiral enantiomer comparison","pmids":["31423744"],"confidence":"Medium","gaps":["Atomic binding pose not resolved here","Single lab"]},{"year":2020,"claim":"Provided the structural basis of gating by revealing the lower X-gate formed by crossed M4 helices and showing high-affinity inhibitors are trapped beneath the closed gate, unifying gating, anesthetic response, and pharmacology.","evidence":"X-ray crystallography of TASK-1 alone and with inhibitors, X-gate mutagenesis, and functional electrophysiology","pmids":["32499642"],"confidence":"High","gaps":["How GPCR/anesthetic signals physically move the gate not fully resolved","Heterodimer structure not determined"]},{"year":2022,"claim":"Linked X-gate-clustered gain-of-function KCNK3 mutations to a developmental disorder with sleep apnea, showing constitutively overactive, GPCR-unresponsive channels that retain pharmacological inhibitor sensitivity.","evidence":"Patch-clamp of patient mutations in heterologous cells, GPCR modulation assays, inhibitor screening, and clinical genetics","pmids":["36195757"],"confidence":"High","gaps":["In vivo neuronal circuit consequences not directly demonstrated","Therapeutic inhibitor efficacy in patients not established"]},{"year":null,"claim":"The molecular identity of the upstream signal coupling hypoxia to TASK-1 inhibition, and how diverse GPCR/anesthetic inputs are mechanically transmitted to the X-gate, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No molecular hypoxia transducer identified","No structural mechanism connecting C-terminal modulatory region to X-gate movement","Heterodimer structure and regulation incompletely defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,3,5,19]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[16,17,18]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,5,6,11,12,13,29]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[6,14]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[13]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[3,15,16,21]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,7,8,16]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[6,10,11,13,14]},{"term_id":"R-HSA-397014","term_label":"Muscle contraction","supporting_discovery_ids":[20,24]}],"complexes":["TASK-1/TASK-3 heterodimer"],"partners":["KCNK9","YWHAB","S100A10","STX8","VPU"],"other_free_text":[]}},"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":"11733509","id":"PMC_11733509","title":"Formation of functional heterodimers between the TASK-1 and TASK-3 two-pore domain potassium channel subunits.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11733509","citation_count":207,"is_preprint":false},{"pmid":"16574908","id":"PMC_16574908","title":"Impact of TASK-1 in human pulmonary artery smooth muscle cells.","date":"2006","source":"Circulation research","url":"https://pubmed.ncbi.nlm.nih.gov/16574908","citation_count":182,"is_preprint":false},{"pmid":"15282272","id":"PMC_15282272","title":"Motoneurons express heteromeric TWIK-related acid-sensitive K+ (TASK) channels containing TASK-1 (KCNK3) and TASK-3 (KCNK9) subunits.","date":"2004","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/15282272","citation_count":172,"is_preprint":false},{"pmid":"11886861","id":"PMC_11886861","title":"Modulation of TASK-1 (Kcnk3) and TASK-3 (Kcnk9) potassium channels: volatile anesthetics and neurotransmitters share a molecular site of action.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11886861","citation_count":170,"is_preprint":false},{"pmid":"20395165","id":"PMC_20395165","title":"A complex task? 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A potential phosphorylation site within this region is not required for modulation.\",\n      \"method\": \"Site-directed mutagenesis, two-electrode voltage-clamp in Xenopus oocytes, tandem heterodimer constructs\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis combined with reconstitution in oocytes, tested on both TASK-1 and tandem heterodimers with multiple modulatory agents\",\n      \"pmids\": [\"11886861\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"TASK-1 is inhibited by Gq-coupled receptor stimulation (LPA, ANG II via AT1a, carbachol via M1) through a phospholipase C (PLC)-dependent mechanism; downstream PLC signals (IP3, Ca2+, DAG) are not the mediators. Gi-coupled M2 receptor activation has minimal effect unless PLC-β2 is co-expressed, implicating PLC activity (not Gi per se) as the key step.\",\n      \"method\": \"Xenopus oocyte two-electrode voltage clamp, GTPγS injection, PLC inhibitor U-73122, co-expression of receptor and PLC-β2 constructs\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution in oocytes with multiple receptor types, pharmacological dissection, and PLC overexpression rescue\",\n      \"pmids\": [\"11443069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TASK-1 and TASK-3 subunits coassemble into heterodimeric channels in mammalian cells, as shown by co-immunoprecipitation; a dominant-negative TASK-1(Y191F) construct suppresses TASK-3 currents. Heteromeric TASK-1/TASK-3 channels in hypoglossal motoneurons have pH sensitivity (~pK 7.3) and isoflurane sensitivity intermediate between the two homomers, providing a substantial component of native background K+ current.\",\n      \"method\": \"Co-immunoprecipitation from transfected mammalian cell membranes, dominant-negative expression, tandem-construct electrophysiology, patch-clamp in hypoglossal motoneuron slices, ruthenium red pharmacology\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — co-IP, dominant-negative, native neuron patch-clamp, tandem constructs across multiple approaches; independently replicated\",\n      \"pmids\": [\"15282272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HIV-1 Vpu physically interacts with TASK-1 in cultured cells and in AIDS lymphoid tissues; Vpu abolishes TASK-1 current, while TASK-1 overexpression impairs Vpu-mediated viral particle release. The N-terminal 40 amino acids of TASK-1 (homologous to Vpu) can enhance HIV-1 particle release.\",\n      \"method\": \"Co-immunoprecipitation from cultured cells and lymphoid tissue, electrophysiological recording of TASK-1 currents, HIV-1 particle release assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal functional and binding assays in cells and native tissue, single lab\",\n      \"pmids\": [\"15099524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In human pulmonary artery smooth muscle cells (PASMCs), TASK-1 controls resting membrane potential; siRNA knockdown depolarizes PASMCs and abolishes sensitivity to anandamide, acidosis, alkalosis, hypoxia, and treprostinil. Treprostinil activates TASK-1 via PKA-dependent phosphorylation.\",\n      \"method\": \"Whole-cell patch-clamp, TASK-1 siRNA knockdown in primary human PASMCs, membrane potential measurements\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — siRNA loss-of-function with multiple pharmacological readouts in primary human cells, PKA pathway pharmacology, replicated by subsequent studies\",\n      \"pmids\": [\"16574908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Forward trafficking of K2P3.1 (TASK-1) to the plasma membrane requires 14-3-3 protein binding, which suppresses COPI-mediated ER retention. The channel uses two separate COPI-binding sites (N- and C-termini); disrupting either interferes with ER retention. p11 binds the C-terminal retention motif in a 14-3-3-dependent manner and modulates forward transport in a subset of tissues.\",\n      \"method\": \"Biochemical binding assays, co-immunoprecipitation, electrophysiology, subcellular localization by immunofluorescence in mammalian cells\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (binding, localization, functional electrophysiology, mutant constructs) in single focused study\",\n      \"pmids\": [\"17908283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TASK-1 current in human PASMCs is inhibited by ET-1 through ETA receptors acting via phospholipase C, PIP2, DAG, and protein kinase C, leading to phosphorylation of TASK-1 and membrane depolarization. siRNA knockdown of TASK-1 abolishes ET-1–induced depolarization.\",\n      \"method\": \"Whole-cell patch-clamp in primary hPASMCs, TASK-1 siRNA, pharmacological dissection of PLC/PKC pathway, isolated perfused mouse lung\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA plus sequential pharmacological pathway dissection in primary human cells, functionally validated in an intact organ model\",\n      \"pmids\": [\"19188660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TASK-1 current in heterologous systems and human PASMCs is inhibited by ET-1 through both ETA (IC50=0.08 nM) and ETB (IC50=0.23 nM) receptors via Rho kinase signaling. Phosphorylation of Ser393 on TASK-1 is required for ETA- and ETB-mediated inhibition; Ser336 mutation selectively attenuates ETA-dependent regulation only.\",\n      \"method\": \"Two-electrode voltage clamp in Xenopus oocytes, whole-cell patch-clamp in hPASMCs, site-directed mutagenesis of Ser393 and Ser336, Rho kinase inhibitor Y-27632\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis identifies specific phosphorylation sites, complemented by receptor pharmacology in oocytes and native cells\",\n      \"pmids\": [\"21838752\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TASK-1 channels are functionally expressed in adrenal glomerulosa H295R cells; siRNA knockdown of TASK-1 increases intracellular Ca2+, activates calmodulin kinase (CaMK), upregulates StAR and CYP11B2 expression, and stimulates pregnenolone and aldosterone production, placing TASK-1 upstream of Ca2+/CaMK aldosterone regulation.\",\n      \"method\": \"siRNA knockdown in H295R cells, Fluo-4 Ca2+ imaging, CaMK pharmacological inhibition, steroid production assays, microarray\",\n      \"journal\": \"Clinical endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA loss-of-function with multiple downstream readouts, Ca2+ imaging, and pharmacological rescue, single lab\",\n      \"pmids\": [\"19878209\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PKA (cAMP-dependent protein kinase) is the kinase responsible for phosphorylating Ser393 of K2P3.1 (TASK-1), enabling 14-3-3 binding and forward transport to the plasma membrane; in vitro phosphorylation assays and cell-surface expression assays confirmed PKA as the relevant kinase over RSK and PKC.\",\n      \"method\": \"In vitro phosphorylation assays, electrophysiology of HEK293-expressed K2P3.1, cell-surface GFP-channel flow cytometry assays, bioinformatics\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay plus functional cell-surface quantification, multiple kinases ruled out\",\n      \"pmids\": [\"21357689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PKC activation (by phorbol esters or group I mGluR stimulation) acutely internalizes TASK-1 (KCNK3) from the cell surface via a mechanism requiring both 14-3-3β and a novel endocytic motif in the channel; depleting either 14-3-3β or ablating the endocytic motif abolishes PKC-regulated trafficking.\",\n      \"method\": \"Patch-clamp in cerebellar granule neurons and cell lines, phorbol ester treatment, mGluR agonist, 14-3-3β siRNA depletion, endocytic motif mutagenesis, surface biotinylation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacological dissection in both native neurons and recombinant systems, multiple orthogonal methods\",\n      \"pmids\": [\"22846993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"N-linked glycosylation of K2P3.1 (TASK-1) at its conserved glycan acceptor site is required for normal cell-surface expression; disruption of glycosylation reduces TASK-1 current and decreases the number of channels at the plasma membrane without grossly altering secretory pathway passage.\",\n      \"method\": \"Patch-clamp electrophysiology, flow cytometry of surface channels, mutagenesis of N-glycosylation site, glycosylation inhibitors, reduced glucose culture\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional and surface quantification, mutagenesis, pharmacological inhibition, single lab\",\n      \"pmids\": [\"23250752\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The endosomal SNARE protein syntaxin-8 physically interacts with TASK-1 and promotes clathrin-mediated cooperative endocytosis, reducing TASK-1 surface expression ~fourfold; TASK-1 colocalizes with syntaxin-8 in early endosomes (2xFYVE/rab5-positive). Both an endocytosis signal in TASK-1 and one in syntaxin-8 are required for this effect.\",\n      \"method\": \"Co-expression in Xenopus oocytes and mammalian cells, co-immunoprecipitation, TIRF microscopy of clathrin/TASK-1/syntaxin-8 vesicles, endosomal colocalization, endocytosis signal mutagenesis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, live TIRF imaging, mutagenesis of both partners, functional current measurements, single lab with orthogonal methods\",\n      \"pmids\": [\"24743596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"14-3-3 binding to the TASK-1 C-terminal trafficking control region is controlled by dual phosphorylation: phosphorylation of the primary serine prevents COPI binding even in the absence of 14-3-3, while phosphorylation of a second serine residue inhibits 14-3-3 binding, creating a switch that can either promote or inhibit surface expression depending on which site is phosphorylated. 14-3-3 affinities for TASK-1 are ~100-fold lower than for TASK-3.\",\n      \"method\": \"Quantitative binding assays with all human 14-3-3 isoforms, phosphopeptide competition, co-immunoprecipitation, electrophysiology\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — quantitative biochemical binding assays for all 14-3-3 isoforms, phosphomimetic/phosphoablative mutants, functional readout, single lab with multiple rigorous methods\",\n      \"pmids\": [\"26743085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"In cerebellar granule cells, native 38-pS background K+ channels consist of both homomeric TASK-3 and heteromeric TASK-1/TASK-3, distinguished by differential sensitivity to ruthenium red and extracellular pH; ~58% of patches show ruthenium-red-insensitive (TASK-1/TASK-3-like) conductance.\",\n      \"method\": \"Single-channel patch-clamp in cerebellar granule neurons and COS-7 cells expressing cloned channels, ruthenium red pharmacology, pH sensitivity\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — single-channel biophysics with pharmacological discrimination in native cells, replicated across multiple studies\",\n      \"pmids\": [\"14678492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PKG activation dynamically upregulates TASK-1 leak currents in cholinergic basal forebrain neurons by reducing the channel's proton-binding affinity (increasing Kd for H+), shifting pH sensitivity; this modulation requires the extracellular pH sensor H98, as H98 mutation abolishes PKG-dependent regulation.\",\n      \"method\": \"Patch-clamp in PKG-loaded HEK293 cells expressing TASK-1, site-directed mutagenesis of H98, patch-clamp in identified cholinergic basal forebrain neurons\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis identifying specific residue plus PKG loading in both heterologous and identified native neurons, single lab\",\n      \"pmids\": [\"20410120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Pore-flanking histidine H98 of TASK-1 contributes to both pH sensing and to the structure of the ion conduction pathway; H98D and H98N mutations reduce K+ selectivity, increase Rb+ permeability, and alter the voltage-dependence of Ba2+ block, indicating that H98 influences selectivity filter structure.\",\n      \"method\": \"Site-directed mutagenesis, two-electrode voltage clamp in Xenopus oocytes, ion selectivity and Ba2+/Cs+ block measurements\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — mutagenesis with biophysical characterization, single lab, single study\",\n      \"pmids\": [\"15611021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Heteromeric TASK-1/TASK-3 channels are the predominant (~75%) oxygen-sensitive background K+ channel in rat carotid body glomus cells, identified by single-channel conductance profiling and differential sensitivity to Mg2+, ruthenium red, and methanandamide; hypoxia inhibits TASK-1/TASK-3-like channels in these cells.\",\n      \"method\": \"Single-channel outside-out and cell-attached patch-clamp in isolated carotid body cells and HeLa cells expressing cloned channels, Mg2+ removal conductance shifts, ruthenium red pharmacology\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — rigorous single-channel biophysics with multiple pharmacological discriminators in native cells compared with cloned channels, single lab\",\n      \"pmids\": [\"19403596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TASK-1 channels expressed in pancreatic α-cells limit Ca2+ entry and glucagon secretion by maintaining membrane hyperpolarization; inhibition (A1899) or genetic ablation of α-cell TASK-1 increases electrical excitability and Ca2+ influx under high glucose, elevating glucagon secretion. Mice with α-cell-specific TASK-1 deletion show improved glucose inhibition of glucagon secretion.\",\n      \"method\": \"Patch-clamp electrophysiology in human and mouse α-cells, α-cell-specific conditional TASK-1 knockout mice, Ca2+ imaging, glucagon secretion assays, TASK-1 inhibitor A1899\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO plus pharmacological inhibition with multiple cellular readouts in both human and mouse cells, single lab\",\n      \"pmids\": [\"25849724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In human atrial cardiomyocytes, single-channel recordings reveal a ~55-pS channel consistent with TASK-1/TASK-3 heteromers; co-expression and tandem-construct experiments in HEK293 cells and Xenopus oocytes confirm that TASK-1/TASK-3 heteromers have a predominant surface expression and reduced affinity for TASK-1-selective blockers compared with homomers.\",\n      \"method\": \"Cell-attached single-channel patch-clamp of human right auricle cardiomyocytes, TASK-1/TASK-3 tandem constructs and co-expression in HEK293/oocytes, immunocytochemistry\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — native single-channel recordings plus heterologous reconstitution, single lab, pharmacological validation\",\n      \"pmids\": [\"25655935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Sp1 transcription factor upregulates p11 (S100A10) expression, which in turn reduces functional TASK-1 expression at the plasma membrane, increasing neuronal excitability. In the SOD1-G93A ALS mouse model, Sp1-p11-TASK1 dysregulation contributes to motor neuron hyperexcitability and degeneration; knockdown of either Sp1 or p11 is neuroprotective.\",\n      \"method\": \"Sp1 and p11 siRNA/overexpression, SOD1-G93A mouse model, patch-clamp recordings, immunofluorescence of channel surface expression, nitrosative stress stimulation of Sp1 promoter\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function in neurons with defined pathway (Sp1→p11→TASK-1 surface expression), in vivo model, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"31439839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"X-ray crystal structure of TASK-1 reveals a lower 'X-gate' formed by the crossed C-terminal M4 helices (residues 243VLRFMT248); this gate controls channel open probability and responds to volatile anesthetics and GPCR signals. X-gate mutations alter open probability and anesthetic response. Two high-affinity inhibitors bind below the selectivity filter and are trapped in the vestibule by the closed X-gate, explaining their exceptionally slow washout.\",\n      \"method\": \"X-ray crystallography of TASK-1 alone and in complex with two inhibitors, site-directed mutagenesis of X-gate residues, electrophysiological functional validation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structures with bound inhibitors plus mutagenesis and functional electrophysiology, published in Nature\",\n      \"pmids\": [\"32499642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"De novo gain-of-function mutations in KCNK3 cluster around the X-gate and produce constitutively overactive TASK-1 channels that no longer respond to inhibition by G-protein-coupled receptor pathways, causing a developmental disorder with sleep apnea (DDSA). Despite defective X-gating, these channels remain sensitive to pharmacological TASK channel inhibitors.\",\n      \"method\": \"Patch-clamp electrophysiology of mutant TASK-1 in heterologous cells, GPCR pathway modulation assays, pharmacological inhibitor screening, clinical genetics\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — electrophysiological characterization of multiple patient mutations, X-gate mechanistic connection established by crystal structure context, pharmacological rescue demonstrated\",\n      \"pmids\": [\"36195757\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TASK-1 current in atrial myocytes from humans and canines with chronic atrial fibrillation is absent despite unchanged or slightly increased total TASK-1 protein; addition of phosphatase to the patch pipette restores TASK-1 current, indicating that phosphorylation-dependent inhibition (not downregulation of protein) accounts for loss of current in chronic AF.\",\n      \"method\": \"Patch-clamp of isolated human and canine atrial myocytes, intrapipette phosphatase application, Western blot of total TASK-1 protein\",\n      \"journal\": \"American journal of physiology. Heart and circulatory physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphatase rescue directly implicates phosphorylation as functional mechanism, matched human and canine samples, single lab\",\n      \"pmids\": [\"25437921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TASK-1 knockdown in the NSCLC cell line A549 (which expresses functional, pH- and hypoxia-sensitive TASK-1 currents) significantly enhances apoptosis and reduces proliferation; this effect is absent in weakly expressing NCI-H358 cells, indicating a cell-context-dependent role for TASK-1 in cancer cell survival.\",\n      \"method\": \"siRNA knockdown, patch-clamp electrophysiology in A549 cells, apoptosis and proliferation assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA loss-of-function with functional electrophysiological validation plus cell biology readouts, single lab\",\n      \"pmids\": [\"27294516\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Reactive oxygen species (H2O2 at millimolar concentrations applied intracellularly) activate TASK-1, TASK-3, and TASK-1/TASK-3 heteromers in inside-out patches, but extracellular or superoxide-generating ROS do not inhibit TASK channels; thus ROS are unlikely to be the hypoxic signal mediating TASK inhibition in chemoreceptor cells.\",\n      \"method\": \"Inside-out, cell-attached, and outside-out patch-clamp in HeLa cells, carotid body glomus cells, adrenal cells, and cerebellar granule neurons; xanthine/XO superoxide generation; DTT and MTSEA treatment\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — negative finding with rigorous biophysical methods across multiple cell types and cloned channels, single lab\",\n      \"pmids\": [\"23007462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TASK-1 K+ channel modulates β-adrenergic thermogenic response in brown adipocytes; Task1-null mice develop BAT whitening and impaired β3-adrenergic response (decreased O2 consumption, UCP1 expression, lipolysis). This phenotype is mediated by exacerbated mineralocorticoid receptor (MR) signaling, as it is mimicked by corticoids and reversed by an MR inhibitor.\",\n      \"method\": \"Task1 knockout mice, brown adipocyte isolation and differentiation, oxygen consumption assays, MR pharmacological inhibition/corticoid stimulation, Ucp1 expression measurements\",\n      \"journal\": \"FASEB journal : official publication of the Federation of American Societies for Experimental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO phenotype with pharmacological rescue via MR pathway, multiple cellular readouts, single lab\",\n      \"pmids\": [\"26527067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Doxapram inhibits human TASK-1 and TASK-3 channels equipotently; mutations of hydrophobic residues in the pore-lining region or removal of the TASK-3 C-terminus attenuate doxapram inhibition but not zinc block, indicating an intracellular/pore-lining binding site distinct from the extracellular zinc site. The positive enantiomer GAL-054 is more potent than doxapram; the negative enantiomer GAL-053 has little effect.\",\n      \"method\": \"Whole-cell patch-clamp in tsA201 cells, site-directed mutagenesis of pore-lining residues, C-terminus deletion constructs, chirally separated enantiomers\",\n      \"journal\": \"Acta physiologica (Oxford, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — mutagenesis identifies binding determinants, enantioselective pharmacology, single lab\",\n      \"pmids\": [\"31423744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PAH-associated TASK-1 missense mutations G106R and L214R reduce channel current markedly despite normal plasma membrane localization (confirmed by confocal microscopy and in-cell/on-cell westerns); WT TASK-1 is activated by riociguat (guanylate cyclase activator), but neither pH 8.4, ONO-RS-082, nor riociguat restores current through these mutant channels.\",\n      \"method\": \"Whole-cell patch-clamp in tsA201 cells, confocal microscopy, in-cell and on-cell western quantification\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods for surface vs. current dissociation, tested with multiple activators, single lab\",\n      \"pmids\": [\"30365877\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"KCNK3/TASK-1 is a constitutively active two-pore domain background K+ channel that sets resting membrane potential in neurons, cardiomyocytes, and vascular/endocrine cells; it functions as a homodimer or heterodimer with TASK-3, is gated by an 'X-gate' formed by crossed C-terminal M4 helices (structure resolved by X-ray crystallography), and is regulated by extracellular pH (via pore-flanking H98), volatile anesthetics and GPCR/neurotransmitter signals acting on the proximal cytoplasmic C-terminus, PKC-triggered 14-3-3β-dependent endocytosis, PKA-dependent phosphorylation of Ser393 enabling 14-3-3-mediated ER export, Rho kinase phosphorylation downstream of endothelin receptors, PKG-dependent modulation of proton binding, PLC-dependent inhibition downstream of Gq-coupled receptors, syntaxin-8-mediated cooperative clathrin endocytosis, and N-linked glycosylation controlling surface stability; gain-of-function X-gate mutations cause a developmental disorder with sleep apnea, while loss-of-function variants underlie heritable pulmonary arterial hypertension by depolarizing pulmonary vascular cells and promoting their proliferation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"KCNK3 (TASK-1) is a two-pore-domain background potassium channel that sets the resting membrane potential of neurons, cardiomyocytes, vascular smooth muscle, and endocrine cells, where its constitutive K+ leak constrains excitability, Ca2+ entry, and downstream secretory and proliferative responses [#3, #5, #19]. It assembles as a homodimer or as TASK-1/TASK-3 heterodimers that produce native background currents of intermediate pH and pharmacological sensitivity in motoneurons, cerebellar granule cells, carotid body glomus cells, and atrial myocytes [#0, #3, #15, #18, #20]. Channel gating is governed by a lower 'X-gate' formed by the crossed C-terminal M4 helices (residues 243-248), which controls open probability and serves as the convergence point for volatile anesthetics and GPCR signals; high-affinity inhibitors bind below the selectivity filter and are trapped in the vestibule by the closed gate [#22, #1]. Conduction and proton sensing depend on the pore-flanking histidine H98, which both reports extracellular pH and shapes selectivity-filter structure [#16, #17]. TASK-1 activity is extensively tuned by signaling: Gq-coupled receptors inhibit it through phospholipase C [#2], endothelin-1 inhibits it via PKC- and Rho-kinase-dependent phosphorylation of Ser393 (and Ser336 for ETA-selective regulation) leading to depolarization [#7, #8], PKG raises proton-binding Kd to upregulate current [#16], and PKA-mediated treprostinil signaling activates it [#5]. Surface density is set by a trafficking program in which phosphorylation of Ser393 by PKA licenses 14-3-3 binding to suppress COPI-mediated ER retention and promote forward transport, with a second phosphosite acting as a switch and p11 (S100A10) modulating delivery [#10, #6, #14]; PKC triggers 14-3-3β-dependent endocytosis through a dedicated endocytic motif [#11], syntaxin-8 drives clathrin-mediated cooperative internalization from early endosomes [#13], and N-linked glycosylation stabilizes channels at the plasma membrane [#12]. Through this regulatory architecture TASK-1 contributes to oxygen sensing in the carotid body [#18], pulmonary vascular tone where loss-of-function impairs hyperpolarization and promotes PASMC proliferation [#5, #29], glucagon secretion in pancreatic α-cells [#19], and aldosterone production in adrenal glomerulosa cells [#9]. Gain-of-function mutations clustered at the X-gate produce constitutively overactive, GPCR-unresponsive channels causing a developmental disorder with sleep apnea, while loss-of-function missense variants (G106R, L214R) that retain normal surface localization underlie heritable pulmonary arterial hypertension [#23, #29].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established that TASK-1 does not act alone but coassembles with TASK-3 into heterodimeric channels, explaining the intermediate biophysical properties of native background currents.\",\n      \"evidence\": \"Xenopus oocyte electrophysiology with tandem TASK-3/TASK-1 constructs and pharmacological discrimination\",\n      \"pmids\": [\"11733509\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and subunit arrangement not resolved at this stage\", \"Physiological tissues where heterodimers dominate not yet defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined how Gq-coupled receptors inhibit TASK-1, showing the signal proceeds through phospholipase C rather than canonical downstream second messengers.\",\n      \"evidence\": \"Two-electrode voltage clamp in oocytes with GTPγS, U-73122, and PLC-β2 co-expression rescue\",\n      \"pmids\": [\"11443069\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular effector linking PLC to the channel not identified\", \"PIP2 versus other lipid involvement unresolved here\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Mapped the channel region required for both anesthetic activation and neurotransmitter inhibition to a six-residue cytoplasmic stretch immediately after M4, localizing modulatory control to the proximal C-terminus.\",\n      \"evidence\": \"Site-directed mutagenesis and voltage-clamp in oocytes using multiple modulatory agents\",\n      \"pmids\": [\"11886861\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How this region couples to the gate was not structurally explained\", \"Putative phosphosite shown dispensable but mechanism left open\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Confirmed physical TASK-1/TASK-3 coassembly and demonstrated its functional contribution to native background current in motoneurons and cerebellar granule cells.\",\n      \"evidence\": \"Co-IP, dominant-negative TASK-1(Y191F), single-channel and slice patch-clamp with ruthenium red and pH discrimination\",\n      \"pmids\": [\"15282272\", \"14678492\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Proportion of homo- versus heterodimers tissue-by-tissue incompletely quantified\", \"Assembly determinants on the subunits not mapped\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed that the pore-flanking histidine H98 is dual-purpose, sensing extracellular pH while also shaping selectivity-filter structure and ion permeation.\",\n      \"evidence\": \"H98 mutagenesis with ion selectivity and Ba2+ block measurements in oocytes\",\n      \"pmids\": [\"15611021\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, single study\", \"Structural basis for filter coupling not directly visualized\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified TASK-1 as an HIV-1 Vpu interaction partner, with reciprocal functional antagonism between channel and viral protein.\",\n      \"evidence\": \"Co-IP from cells and lymphoid tissue, current recordings, and HIV-1 particle-release assays\",\n      \"pmids\": [\"15099524\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Physiological relevance to infection in vivo not established\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Placed TASK-1 at the center of pulmonary vascular membrane potential control, showing its leak current mediates responses to acidosis, hypoxia, and prostacyclin analogs.\",\n      \"evidence\": \"siRNA knockdown and whole-cell patch-clamp in primary human PASMCs with PKA pathway pharmacology\",\n      \"pmids\": [\"16574908\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular link from PKA to channel activation not mapped here\", \"Hypoxia-sensing mechanism left unresolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the forward-trafficking logic of TASK-1, in which 14-3-3 binding overrides dual COPI-mediated ER retention to permit surface delivery, with p11 as a tissue-selective modulator.\",\n      \"evidence\": \"Binding assays, co-IP, immunofluorescence localization, and electrophysiology in mammalian cells\",\n      \"pmids\": [\"17908283\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase generating the 14-3-3 signal not yet identified at this stage\", \"Tissue specificity of p11 effect not fully delineated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Dissected endothelin-1 inhibition of TASK-1 into convergent kinase pathways, identifying Ser393 as the critical phosphoacceptor and Ser336 as an ETA-selective site.\",\n      \"evidence\": \"Patch-clamp in hPASMCs and oocytes, Ser393/Ser336 mutagenesis, Rho-kinase and PLC/PKC pharmacology, perfused lung\",\n      \"pmids\": [\"19188660\", \"21838752\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PKC and Rho-kinase act on the same or distinct residues partly unresolved\", \"In vivo contribution to PAH not directly tested here\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Extended TASK-1's role to endocrine control, placing it upstream of Ca2+/CaMK-driven aldosterone production in adrenal glomerulosa cells.\",\n      \"evidence\": \"siRNA knockdown in H295R cells with Ca2+ imaging, CaMK inhibition, and steroidogenesis assays\",\n      \"pmids\": [\"19878209\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab in a cell line\", \"In vivo adrenal phenotype not established here\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified heteromeric TASK-1/TASK-3 as the dominant oxygen-sensitive background channel in carotid body glomus cells, linking the channel to peripheral chemoreception.\",\n      \"evidence\": \"Single-channel patch-clamp in isolated glomus cells versus cloned channels with multiple pharmacological discriminators\",\n      \"pmids\": [\"19403596\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular identity of the hypoxia transducer acting on the channel unknown\", \"Direct versus indirect O2 sensing unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Revealed a PKG-dependent mechanism that upregulates TASK-1 by lowering proton-binding affinity, acting through the H98 pH sensor.\",\n      \"evidence\": \"PKG-loaded HEK293 cells and identified cholinergic neurons with H98 mutagenesis\",\n      \"pmids\": [\"20410120\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct phosphorylation site for PKG effect not mapped\", \"Single lab\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified PKA as the kinase that phosphorylates Ser393 to enable 14-3-3 binding and forward transport, connecting cAMP signaling to channel surface density.\",\n      \"evidence\": \"In vitro kinase assays and cell-surface flow cytometry of GFP-channels, ruling out RSK and PKC\",\n      \"pmids\": [\"21357689\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Subcellular compartment of PKA action not defined\", \"Cross-talk with the inhibitory ET-1/Ser393 axis not reconciled\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed that PKC drives rapid 14-3-3β-dependent endocytosis of TASK-1 via a dedicated endocytic motif, establishing a regulated removal arm complementing forward trafficking.\",\n      \"evidence\": \"Patch-clamp in granule neurons and cell lines, 14-3-3β siRNA, endocytic motif mutagenesis, surface biotinylation\",\n      \"pmids\": [\"22846993\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endocytic adaptor machinery not fully defined here\", \"Relationship to PKC-mediated current inhibition not separated\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Established N-linked glycosylation as a determinant of TASK-1 surface stability rather than secretory transit.\",\n      \"evidence\": \"Patch-clamp, surface flow cytometry, glycosite mutagenesis, and glycosylation inhibitors\",\n      \"pmids\": [\"23250752\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Mechanism of surface stabilization by glycan not defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Tested and rejected ROS as the inhibitory hypoxic signal for TASK channels, refining models of chemoreceptor oxygen sensing.\",\n      \"evidence\": \"Inside-out and outside-out patch-clamp across multiple native cell types and cloned channels with superoxide generation\",\n      \"pmids\": [\"23007462\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the true hypoxic signal remains unknown\", \"Negative finding from a single lab\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated that syntaxin-8 physically binds TASK-1 and promotes clathrin-mediated cooperative endocytosis from early endosomes, adding a SNARE-dependent route of surface removal.\",\n      \"evidence\": \"Co-IP, TIRF imaging of clathrin/channel/syntaxin-8 vesicles, endosomal colocalization, and dual endocytosis-signal mutagenesis\",\n      \"pmids\": [\"24743596\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single lab\", \"How syntaxin-8 and 14-3-3β pathways are coordinated unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed that loss of TASK-1 current in chronic atrial fibrillation arises from phosphorylation-dependent inhibition rather than protein downregulation, distinguishing functional from expression-level regulation in disease.\",\n      \"evidence\": \"Patch-clamp of human and canine AF atrial myocytes with intrapipette phosphatase rescue and total-protein westerns\",\n      \"pmids\": [\"25437921\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Responsible kinase/phosphosite in AF not identified\", \"Single lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established physiological roles for TASK-1 in metabolic and endocrine tissues, controlling glucagon secretion in α-cells and β-adrenergic thermogenesis in brown adipose tissue.\",\n      \"evidence\": \"α-cell-specific and global Task1 knockout mice, patch-clamp, Ca2+ imaging, secretion and thermogenesis assays with MR pharmacology\",\n      \"pmids\": [\"25849724\", \"26527067\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"BAT phenotype mechanism via mineralocorticoid receptor is correlative\", \"Cell-autonomous versus systemic contributions to thermogenesis not fully separated\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Reinforced the heteromeric identity of native cardiac background channels and showed TASK-1/TASK-3 heteromers dominate surface expression with altered blocker sensitivity.\",\n      \"evidence\": \"Single-channel patch-clamp of human atrial myocytes plus tandem/co-expression constructs in HEK293 and oocytes\",\n      \"pmids\": [\"25655935\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"In vivo cardiac consequence of heteromer dominance not tested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Resolved the trafficking switch logic, showing dual phosphorylation can either license or block 14-3-3 binding, and that TASK-1 binds 14-3-3 ~100-fold weaker than TASK-3.\",\n      \"evidence\": \"Quantitative binding assays with all 14-3-3 isoforms, phosphopeptide competition, co-IP, and electrophysiology\",\n      \"pmids\": [\"26743085\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinases targeting the second serine in vivo not identified\", \"Functional consequence of weaker 14-3-3 affinity for heterodimers unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed that PAH-associated G106R and L214R variants abolish current despite normal surface trafficking, defining a conduction/gating loss-of-function mechanism resistant to pharmacological activation.\",\n      \"evidence\": \"Patch-clamp, confocal microscopy, and in-cell/on-cell westerns with multiple activators in tsA201 cells\",\n      \"pmids\": [\"30365877\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of current loss not directly visualized\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined a transcriptional-to-surface regulatory axis (Sp1→p11→TASK-1) that lowers channel surface expression to drive neuronal hyperexcitability, implicated in ALS motor neuron degeneration.\",\n      \"evidence\": \"Sp1/p11 siRNA and overexpression, SOD1-G93A mice, patch-clamp, and surface immunofluorescence\",\n      \"pmids\": [\"31439839\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct causality of TASK-1 reduction in human ALS not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Localized the doxapram/GAL-054 inhibitory site to the intracellular pore-lining region, distinct from the extracellular zinc site, with enantioselective potency.\",\n      \"evidence\": \"Whole-cell patch-clamp, pore-lining mutagenesis, C-terminus deletion, and chiral enantiomer comparison\",\n      \"pmids\": [\"31423744\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Atomic binding pose not resolved here\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Provided the structural basis of gating by revealing the lower X-gate formed by crossed M4 helices and showing high-affinity inhibitors are trapped beneath the closed gate, unifying gating, anesthetic response, and pharmacology.\",\n      \"evidence\": \"X-ray crystallography of TASK-1 alone and with inhibitors, X-gate mutagenesis, and functional electrophysiology\",\n      \"pmids\": [\"32499642\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How GPCR/anesthetic signals physically move the gate not fully resolved\", \"Heterodimer structure not determined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Linked X-gate-clustered gain-of-function KCNK3 mutations to a developmental disorder with sleep apnea, showing constitutively overactive, GPCR-unresponsive channels that retain pharmacological inhibitor sensitivity.\",\n      \"evidence\": \"Patch-clamp of patient mutations in heterologous cells, GPCR modulation assays, inhibitor screening, and clinical genetics\",\n      \"pmids\": [\"36195757\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo neuronal circuit consequences not directly demonstrated\", \"Therapeutic inhibitor efficacy in patients not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular identity of the upstream signal coupling hypoxia to TASK-1 inhibition, and how diverse GPCR/anesthetic inputs are mechanically transmitted to the X-gate, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular hypoxia transducer identified\", \"No structural mechanism connecting C-terminal modulatory region to X-gate movement\", \"Heterodimer structure and regulation incompletely defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 3, 5, 19]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [16, 17, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 5, 6, 11, 12, 13, 29]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [6, 14]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [3, 15, 16, 21]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 7, 8, 16]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [6, 10, 11, 13, 14]},\n      {\"term_id\": \"R-HSA-397014\", \"supporting_discovery_ids\": [20, 24]}\n    ],\n    \"complexes\": [\n      \"TASK-1/TASK-3 heterodimer\"\n    ],\n    \"partners\": [\n      \"KCNK9\",\n      \"YWHAB\",\n      \"S100A10\",\n      \"STX8\",\n      \"Vpu\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}