{"gene":"KCNK2","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":2000,"finding":"TREK-1 is directly activated by heat in a reversible manner; a 10°C rise enhances current ~7-fold. Prostaglandin E2 and cAMP reverse thermal opening via PKA-mediated phosphorylation of Ser333.","method":"Patch-clamp electrophysiology, site-directed mutagenesis (Ser333)","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct electrophysiology with mutagenesis identifying the specific phosphorylation site, replicated in multiple studies","pmids":["10835347"],"is_preprint":false},{"year":2000,"finding":"Lysophospholipids (e.g., lysophosphatidylcholine) activate TREK-1 in cell-attached patches but not excised patches, indicating indirect activation requiring a cytosolic factor; the carboxyl-terminal region of TREK-1 (not the amino terminus or extracellular M1P1 loop) is critically required for LPC activation.","method":"Patch-clamp electrophysiology (cell-attached and excised patches), C-terminal deletion mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct electrophysiology with systematic domain deletion mutagenesis identifying the C-terminal requirement","pmids":["10744694"],"is_preprint":false},{"year":2000,"finding":"Riluzole transiently activates TREK-1 followed by inhibition; the inhibitory phase is due to riluzole-induced increase in intracellular cAMP leading to PKA-dependent phosphorylation. TREK-1 mutants lacking the PKA phosphorylation serine residue are activated in a sustained manner by riluzole.","method":"Whole-cell patch-clamp, site-directed mutagenesis of PKA phosphorylation site","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 1 / Strong — electrophysiology combined with mutagenesis identifying PKA site, mechanistically detailed","pmids":["10779373"],"is_preprint":false},{"year":2001,"finding":"Phosphorylation of native hippocampal and cloned KCNK2 channels produces reversible interconversion between leak (background) and voltage-dependent phenotypes, demonstrating dynamic regulation of channel gating by phosphorylation.","method":"Single-channel patch-clamp recording of native hippocampal and recombinant KCNK2 channels","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct single-channel recordings on both native and cloned channels showing reversible state interconversion","pmids":["11319556"],"is_preprint":false},{"year":2001,"finding":"TREK-1 is regulated by NO/cGMP pathway: sodium nitroprusside and 8-Br-cGMP increase TREK-1 currents, and mutation of the PKG consensus site at serine 351 abolishes this stimulatory effect without affecting PKA-mediated inhibition.","method":"Whole-cell and single-channel patch-clamp in COS cells expressing TREK-1, site-directed mutagenesis (Ser351)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — electrophysiology with specific mutagenesis identifying PKG phosphorylation site","pmids":["11560940"],"is_preprint":false},{"year":2004,"finding":"Membrane phospholipids including PIP2 control TREK-1 gating; a positively charged cluster in the C-terminal domain is the phospholipid-sensing domain that interacts with the plasma membrane. Proton sensor E306 in this region is required for activation by cytosolic acidosis; protonation of E306 tightens channel-phospholipid interaction and opens TREK-1 at atmospheric pressure.","method":"Patch-clamp electrophysiology, site-directed mutagenesis (E306 and C-terminal charged cluster)","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — electrophysiology with mutagenesis identifying both the phospholipid-sensing domain and the proton sensor residue","pmids":["15577940"],"is_preprint":false},{"year":2004,"finding":"TREK-1 knockout mice show increased sensitivity to ischemia and epilepsy; neuroprotection by polyunsaturated fatty acids (PUFAs) is abolished in Trek1−/− mice, establishing TREK-1 as essential for PUFA-mediated neuroprotection.","method":"Genetic knockout mouse model, ischemia and epilepsy models in vivo","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with specific mechanistic phenotype (loss of PUFA neuroprotection), replicated across multiple experimental paradigms","pmids":["15175651"],"is_preprint":false},{"year":2004,"finding":"Trek1−/− mice are resistant to volatile anesthetic-induced anesthesia, establishing TREK-1 as a functional target of volatile anesthetics in vivo.","method":"Genetic knockout mouse model, anesthesia sensitivity testing","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout phenotype specifically demonstrates TREK-1 is required for volatile anesthetic action in vivo","pmids":["15175651"],"is_preprint":false},{"year":2005,"finding":"Activation of Gαq-coupled receptors (thyrotropin-releasing hormone receptor, Orexin receptor) inhibits TREK-1 via PKC. A sequential phosphorylation model was established: PKA phosphorylates Ser333, which enables subsequent phosphorylation at Ser300, together inhibiting channel activity. S333A and S300A mutations enhance basal current; S333D and S300D mimick phosphorylation and reduce currents.","method":"Whole-cell patch-clamp in HEK293 cells, pharmacological PKC/PKA inhibitors, systematic mutagenesis of Ser300 and Ser333","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple mutagenesis combinations plus pharmacological validation establishing sequential phosphorylation mechanism","pmids":["16006563"],"is_preprint":false},{"year":2005,"finding":"Fluoxetine and norfluoxetine inhibit human TREK-1 (IC50 19 μM and 9 μM, respectively) in a voltage-independent manner. The E306A mutation reduces fluoxetine inhibition (~40% block vs. 84%), linking the intracellular proton sensor to drug sensitivity. C-terminal truncation does not affect fluoxetine block.","method":"Whole-cell patch-clamp in tsA201 cells, systematic C-terminal truncation and E306A mutagenesis","journal":"British journal of pharmacology","confidence":"High","confidence_rationale":"Tier 1 / Strong — electrophysiology with mutagenesis identifying residues mediating drug inhibition","pmids":["15685212"],"is_preprint":false},{"year":2005,"finding":"TREK-1 expression markedly alters the cytoskeletal network and induces formation of actin- and ezrin-rich membrane protrusions. Cytoskeletal remodeling requires the PKA phosphorylation site S333 and proton sensor E306 but is independent of channel permeation. Conversely, the actin cytoskeleton tonically represses TREK-1 mechanosensitivity.","method":"Live-cell imaging, fluorescence microscopy, mutagenesis (S333, E306), genetic inactivation of TREK-1 in striatal neurons","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (imaging, mutagenesis, KO neurons) establishing bidirectional TREK-1/actin cytoskeleton interaction","pmids":["15976821"],"is_preprint":false},{"year":2006,"finding":"Deletion of TREK-1 (Kcnk2−/−) in mice leads to increased efficacy of serotonin (5-HT) neurotransmission and resistance to depression in five behavioral models, with reduced stress-induced corticosterone elevation, establishing TREK-1 as a regulator of 5-HT signaling and mood.","method":"Genetic knockout mouse model, five depression behavioral models, neurochemical (corticosterone) measurements","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO validated in five independent depression models with neurochemical endpoint","pmids":["16906152"],"is_preprint":false},{"year":2006,"finding":"Trek1−/− mice display increased sensitivity to painful heat near the noxious threshold, increased sensitivity to low-threshold mechanical stimuli, and increased thermal/mechanical hyperalgesia under inflammation. Polymodal C-fibers in KO mice are more heat sensitive, establishing TREK-1 as a molecular sensor for polymodal pain.","method":"Genetic knockout mouse model, single-fiber recordings, behavioral pain assays, inflammation models","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO combined with single-fiber electrophysiology across multiple pain modalities","pmids":["16675954"],"is_preprint":false},{"year":2008,"finding":"External acidification inhibits human K2P2.1 (TREK-1) by inducing C-type gating closure. Histidine residues His87 and His141 in the first external loop govern this pH response; protonation generates local positive charge that draws Glu84 away from its interactions, collapsing the selectivity filter. Mutation S164Y accelerates C-type gating.","method":"Whole-cell patch-clamp, site-directed mutagenesis of His87, His141, Glu84, S164Y; ion selectivity measurements","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — electrophysiology with multiple mutagenesis experiments identifying pH-sensing mechanism and C-type gating residues","pmids":["18474599"],"is_preprint":false},{"year":2009,"finding":"TRAAK and TREK-1 channels (mechano-gated K+ channels) control both heat and cold pain thresholds in mice. TREK-1 and TRAAK together regulate nociceptor activation by cold, particularly in menthol-insensitive neurons.","method":"Genetic knockout mice for TREK-1 and TRAAK, behavioral thermal and mechanical pain assays, single-fiber recordings","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — dual KO model with behavioral and electrophysiological characterization across multiple temperature ranges","pmids":["19279663"],"is_preprint":false},{"year":2012,"finding":"TREK-1 mediates fast, nonvesicular glutamate release from astrocytes upon GPCR activation. The mechanism requires Gαi activation, dissociation of Gβγ, and direct interaction of Gβγ with the N-terminus of TREK-1 to open the channel. TREK-1 is preferentially localized at astrocyte cell body and processes (not microdomains near synapses).","method":"Co-immunoprecipitation (Gβγ–TREK-1 N-terminus interaction), sniffer-patch glutamate detection, immunoelectron microscopy, shRNA knockdown, GPCR pharmacology","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP identifying direct Gβγ–TREK-1 interaction, combined with functional sniffer-patch and ultrastructural localization in single rigorous study","pmids":["23021213"],"is_preprint":false},{"year":2013,"finding":"Purified mouse TREK-1 reconstituted in giant liposomes is directly sensitive to membrane tension: intrinsic lipid bilayer tension is sufficient to maximally activate the channel, and positive pressure closes it. This demonstrates TREK-1 is an intrinsically mechanosensitive channel requiring no accessory proteins.","method":"Protein purification from yeast, reconstitution in giant liposomes, patch-clamp electrophysiology","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution of purified channel in defined lipid bilayer with direct mechanical gating, establishing intrinsic mechanosensitivity","pmids":["23897808"],"is_preprint":false},{"year":2013,"finding":"TREK-1 mediates morphine-induced analgesia downstream of μ-opioid receptor signaling in mice, but is not involved in morphine-induced constipation, respiratory depression, or dependence, separating analgesic from adverse opioid effects.","method":"Genetic knockout mouse model (Trek1−/−), behavioral pain assays, opioid adverse-effect assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO model with selective dissociation of analgesic vs. adverse opioid effects across multiple endpoints","pmids":["24346231"],"is_preprint":false},{"year":2014,"finding":"Native TWIK-1 and TREK-1 form a functional heterodimeric channel in astrocytes via a disulfide bridge between TWIK-1 Cys69 and TREK-1 Cys93. Surface expression of TWIK-1 and TREK-1 are interdependent. The TWIK-1/TREK-1 heterodimer mediates astrocytic passive conductance and cannabinoid-induced glutamate release.","method":"Co-immunoprecipitation, site-directed mutagenesis of Cys69/Cys93, gene silencing, patch-clamp electrophysiology, glutamate release assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — biochemical identification of disulfide bond with mutagenesis confirmation, functional validation by gene silencing and electrophysiology","pmids":["24496152"],"is_preprint":false},{"year":2014,"finding":"βIV-spectrin, an actin-associated protein, colocalizes with TREK-1 at the myocyte intercalated disc, physically associates with TREK-1, and is required for TREK-1 membrane targeting. Mice expressing βIV-spectrin lacking TREK-1 binding (qv4J) display aberrant TREK-1 membrane localization, decreased TREK-1 activity, delayed action potential repolarization, and arrhythmia.","method":"Co-immunoprecipitation, immunofluorescence colocalization, functional electrophysiology in qv4J mice, action potential recordings","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP establishing physical association, genetic mouse model confirming membrane targeting role with arrhythmia phenotype","pmids":["24445605"],"is_preprint":false},{"year":2016,"finding":"βIV-spectrin/TREK-1 complex is required for normal sinoatrial node cell excitability. Cardiomyocyte-specific deletion of TREK-1 causes sinoatrial dysfunction with bradycardia and sinus pauses under stress. Loss of βIV-spectrin (qv4J mice) disrupts normal TREK-1 membrane localization in sinoatrial cells.","method":"Cardiac-specific conditional knockout mice (αMHC-Kcnk2f/f), action potential measurements, sinoatrial node cell electrophysiology, TREK-1 localization imaging","journal":"Journal of the American Heart Association","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KO with electrophysiological characterization and localization data","pmids":["27098968"],"is_preprint":false},{"year":2016,"finding":"TREK-1 and TREK-2 subunits form functional heterodimers in heterologous expression and in native dorsal root ganglion neurons. The TREK-1/TREK-2 heterodimer has unique biophysical and pharmacological properties (single-channel conductance intermediate between homodimers; ruthenium red sensitivity intermediate between TREK-1 and TREK-2). Assembly confirmed by co-immunoprecipitation.","method":"Tandem-construct expression, co-immunoprecipitation of epitope-tagged subunits in Xenopus oocytes, patch-clamp electrophysiology, ruthenium red pharmacology in DRG neurons","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct Co-IP confirmation of heterodimer assembly, functional tandem construct characterization, and native tissue validation","pmids":["27129242"],"is_preprint":false},{"year":2017,"finding":"A heterozygous point mutation in the selectivity filter of TREK-1 introduces abnormal sodium permeability and hypersensitivity to stretch-activation, associated with ventricular tachycardia. This indicates the selectivity filter is directly involved in stretch-induced activation and desensitization.","method":"Patch-clamp electrophysiology of mutant TREK-1, ion selectivity measurements, stretch-activation assays, computational cardiac modeling","journal":"EMBO molecular medicine","confidence":"High","confidence_rationale":"Tier 1 / Moderate — electrophysiology with specific disease mutation revealing dual role of selectivity filter in ion selectivity and mechanogating, single lab but multiple orthogonal methods","pmids":["28242754"],"is_preprint":false},{"year":2018,"finding":"Cardiac fibroblast-specific (not cardiomyocyte-specific) TREK-1 deletion prevents pressure overload-induced cardiac dysfunction. Loss of TREK-1 in fibroblasts is associated with diminished cardiac fibrosis and reduced JNK activation in both cardiomyocytes and fibroblasts.","method":"Cell-type-specific conditional knockout mice, pressure overload model, cardiac function assessment, JNK signaling analysis, fibrosis measurements","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KO dissecting fibroblast vs. cardiomyocyte roles, with defined molecular pathway (JNK) and cardiac functional endpoint","pmids":["30153110"],"is_preprint":false},{"year":2019,"finding":"Phospholipase D2 (PLD2) localizes to TREK-1 through palmitate-mediated lipid compartmentalization and generates local high concentrations of phosphatidic acid (PA) that gates TREK-1. Disruption of palmitate-mediated PLD2 localization is proposed as a shared pathway for both mechanical force and anesthetic activation of TREK-1.","method":"Lipid biochemistry, membrane localization experiments, channel gating assays with PA","journal":"Biochimica et biophysica acta. Biomembranes","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — mechanistic model supported by localization and lipid experiments from single lab, but full reconstitution/mutagenesis evidence not described in abstract","pmids":["31672538"],"is_preprint":false},{"year":2013,"finding":"TREK-1 splice variant TREK-1e (lacking transmembrane domains M3/M4 and second pore domain) is retained in the endoplasmic reticulum and reduces surface expression and current density of full-length TREK-1 when co-expressed. Residues I204 and W205 in the C-terminus of TREK-1e mediate ER retention.","method":"Live-cell imaging of GFP-tagged constructs, surface expression assays, mutagenesis of ER retention signal, electrophysiology in Xenopus oocytes, reporter fusion constructs","journal":"Pflugers Archiv : European journal of physiology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods (imaging, mutagenesis, electrophysiology, reporter assays) in single lab establishing ER retention mechanism","pmids":["24196565"],"is_preprint":false},{"year":2011,"finding":"TREK-1 alternative translation initiation generates two isoforms; the truncated isoform (TREK-1[ΔN52]) lacking the first 52 amino acids shows reduced K+ selectivity and 70% reduced sensitivity to fluoxetine inhibition, indicating the N-terminal 52 amino acids are essential for fluoxetine sensitivity.","method":"Electrophysiology (HEK-293 cells and Xenopus oocytes), alternative translation initiation mutagenesis (TREK-1[M53I], TREK-1[ΔN52])","journal":"Neuropharmacology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — electrophysiology with engineered N-terminal isoforms identifying the structural determinant of fluoxetine sensitivity","pmids":["21740918"],"is_preprint":false},{"year":2015,"finding":"In pituitary corticotropes, arginine vasopressin suppresses background TREK-1 current via PKC activation, causing membrane depolarization. AVP and CRH have additive effects on TREK-1 current suppression via PKC and PKA pathways respectively, resulting in greater depolarization and potentiated ACTH secretion.","method":"Perforated patch-clamp in mouse corticotropes, pharmacological PKC inhibition, PKA pathway activation, Ca2+ buffering experiments","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct electrophysiology in native cells with pharmacological dissection of PKC vs. PKA contributions to TREK-1 regulation","pmids":["26248219"],"is_preprint":false},{"year":2018,"finding":"Activation of astrocytic μ-opioid receptor (MOR) by DAMGO causes fast glutamate release via TREK-1-containing K2P channels. MOR and TREK-1 are co-localized in astrocyte soma and processes. Glutamate release is reduced by TREK-1 gene silencing and absent in MOR-deficient astrocytes.","method":"Sniffer-patch glutamate detection, shRNA gene silencing of TREK-1, MOR-deficient mice, immunofluorescence colocalization","journal":"Frontiers in cellular neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — functional glutamate release assay combined with genetic silencing and KO validation, with localization data","pmids":["30319359"],"is_preprint":false},{"year":2011,"finding":"Trek-1 deficiency in alveolar epithelial cells decreases IL-6 secretion via reduced p38 phosphorylation and impaired PKCθ phosphorylation, without affecting Ca2+ signaling. This places TREK-1 upstream of p38 and Ca2+-independent PKC isoforms in the cytokine secretion pathway.","method":"shRNA-mediated Trek-1 knockdown in mouse and human AECs, western blot analysis of signaling intermediates (p38, multiple PKC isoforms), ELISA for IL-6, pharmacological inhibition","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with pathway analysis using multiple phosphorylation markers, single lab","pmids":["23275623"],"is_preprint":false},{"year":2012,"finding":"TREK-1 activity in astrocytes supports glutamate clearance capacity; suppression of TREK-1 activity inhibits glutamate clearance and enhances astrocyte-derived S100β secretion after ischemic insult, leading to increased neuronal apoptosis.","method":"TREK-1 pharmacological inhibition in cultured astrocytes, glutamate uptake assay, S100β ELISA, neuronal apoptosis assay, simulated ischemia model","journal":"Journal of molecular neuroscience : MN","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — pharmacological inhibition approach with functional cellular readouts, single lab","pmids":["22895843"],"is_preprint":false},{"year":2017,"finding":"Interaction of cochlin (extracellular matrix protein) with TREK-1 in trabecular meshwork cells regulates intraocular pressure. Multimeric cochlin (formed under high shear stress) reduces TREK-1 current, whereas monomeric cochlin does not. TREK-1 silencing in mice prevents cochlin overexpression-mediated IOP increase.","method":"Biochemical co-immunoprecipitation/interaction assays, electrophysiology, TREK-1 silencing in mice, IOP measurements","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical and electrophysiological demonstration of cochlin-TREK-1 interaction with in vivo IOP validation, single lab","pmids":["28352076"],"is_preprint":false},{"year":2019,"finding":"TREK-1 KO increases dendritic sprouting, immature spine number, neuronal excitability, and both excitatory and inhibitory postsynaptic currents in hippocampal CA1 pyramidal neurons. Increased EPSCs are attributed to increased presynaptic glutamate release probability and enhanced postsynaptic AMPA receptor expression. TREK-1 KO occludes LTP and causes recognition memory deficit.","method":"TREK-1 knockout mice, patch-clamp electrophysiology, LTP recordings, morphological analysis of dendritic spines, behavioral memory testing","journal":"Molecular neurobiology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KO with multiple orthogonal electrophysiological and behavioral endpoints, identifying specific synaptic mechanisms","pmids":["31728930"],"is_preprint":false},{"year":2012,"finding":"TREK-1 splice variants from preterm labor myometrium interact with full-length wild-type TREK-1; co-immunoprecipitation demonstrates physical interaction. Wild-type TREK-1 is located at the plasma membrane, while splice variants (lacking pore or transmembrane domains) distribute throughout the cell and cause wild-type TREK-1 to redistribute from membrane to cytoplasm when co-expressed.","method":"Co-immunoprecipitation of FLAG/His-tagged constructs, subcellular localization imaging in HEK293T cells","journal":"Biology of reproduction","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and localization data, but functional channel activity of variants not established, single lab","pmids":["22811574"],"is_preprint":false},{"year":2015,"finding":"Pharmacological differentiation: ruthenium red (RR) inhibits TREK-2 (IC50 = 0.2 μM) but not TREK-1; mutation I110D in TREK-1 (corresponding to D135 in TREK-2 within the extracellular ion pathway) renders TREK-1 sensitive to RR, identifying the extracellular cap residue as the structural determinant of RR sensitivity.","method":"Two-electrode voltage clamp (Xenopus oocytes), whole-cell patch clamp (DRG neurons), site-directed mutagenesis (I110D in TREK-1)","journal":"British journal of pharmacology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — gain-of-function mutagenesis pinpointing structural basis for pharmacological difference, validated in native neurons","pmids":["25409575"],"is_preprint":false}],"current_model":"TREK-1 (KCNK2/K2P2.1) is a polymodally regulated two-pore-domain background K+ channel that is intrinsically mechanosensitive (directly gated by membrane tension), activated by heat, polyunsaturated fatty acids, lysophospholipids, intracellular acidosis via proton sensor E306, and volatile anesthetics, and inhibited by PKA phosphorylation at Ser333 (enabling sequential phosphorylation at Ser300), PKC phosphorylation (Ser300/Ser333, downstream of Gq-coupled receptors), and PKG phosphorylation at Ser351; its surface expression and membrane targeting are controlled by βIV-spectrin in cardiomyocytes and by a disulfide-linked TWIK-1 heterodimer in astrocytes; in astrocytes, Gβγ directly interacts with the TREK-1 N-terminus downstream of Gi-coupled GPCRs to mediate fast non-vesicular glutamate release; in neurons, TREK-1 sets resting membrane potential and its loss increases excitability, impairs LTP, and disrupts cognitive function; in vivo, TREK-1 is essential for PUFA-mediated neuroprotection, volatile anesthetic action, morphine analgesia, serotonin-dependent mood regulation, and cardiac sinoatrial node excitability."},"narrative":{"mechanistic_narrative":"KCNK2 (TREK-1) is a polymodally gated two-pore-domain background K+ channel that sets resting membrane potential and integrates physical and chemical stimuli into changes in K+ conductance [PMID:11319556, PMID:23897808]. The channel is intrinsically mechanosensitive: purified TREK-1 reconstituted in liposomes is gated directly by membrane bilayer tension without accessory proteins, and its selectivity filter participates in both ion selectivity and stretch-induced gating/desensitization [PMID:23897808, PMID:28242754]. It is also activated by heat [PMID:10835347], lysophospholipids acting through its C-terminus [PMID:10744694], and membrane phospholipids including PIP2, with a C-terminal positively charged cluster serving as the phospholipid-sensing domain and the proton sensor E306 mediating activation by intracellular acidosis [PMID:15577940]. External acidification conversely closes the channel through C-type gating governed by external-loop histidines [PMID:18474599]. TREK-1 gating is reversibly tuned by phosphorylation, interconverting leak and voltage-dependent behaviors [PMID:11319556]: PKA phosphorylation of Ser333 enables sequential phosphorylation at Ser300 to inhibit the channel downstream of Gq/PKC signaling, while PKG phosphorylation at Ser351 activates it via the NO/cGMP pathway [PMID:16006563, PMID:11560940]. Channel surface expression and assembly are controlled by partners and isoforms — βIV-spectrin targets TREK-1 to cardiomyocyte membranes [PMID:24445605], a disulfide-linked TWIK-1/TREK-1 heterodimer forms in astrocytes [PMID:24496152], TREK-1/TREK-2 heterodimers arise in sensory neurons [PMID:27129242], and N-terminally truncated or pore-deficient splice variants are ER-retained and suppress surface expression of full-length channel [PMID:24196565]. Functionally, TREK-1 is essential in vivo for PUFA-mediated neuroprotection and volatile anesthetic action [PMID:15175651], polymodal heat/cold/mechanical pain sensing [PMID:16675954, PMID:19279663], morphine analgesia [PMID:24346231], serotonin-dependent mood regulation [PMID:16906152], hippocampal excitability, LTP, and memory [PMID:31728930], and cardiac sinoatrial excitability [PMID:27098968]. In astrocytes, Gi-coupled GPCR activation releases Gβγ, which binds the TREK-1 N-terminus to drive fast non-vesicular glutamate release [PMID:23021213, PMID:30319359].","teleology":[{"year":2000,"claim":"Establishing that TREK-1 is a thermosensitive channel under cAMP/PKA control answered how a background K+ channel could couple temperature to neuronal signaling and be switched off by GPCR signaling.","evidence":"Patch-clamp with Ser333 mutagenesis in heterologous cells","pmids":["10835347"],"confidence":"High","gaps":["Did not resolve how thermal energy is transduced to the gate","Physiological temperature range relevance untested in vivo at this stage"]},{"year":2000,"claim":"Domain mapping of lysophospholipid and riluzole responses localized lipid-sensing to the C-terminus and confirmed PKA phosphorylation as a dominant inhibitory switch.","evidence":"Cell-attached vs excised patch recording, C-terminal deletions, and PKA-site mutagenesis","pmids":["10744694","10779373"],"confidence":"High","gaps":["Identity of the cytosolic factor required for LPC activation not defined","Did not establish direct vs indirect lipid binding"]},{"year":2001,"claim":"Demonstrating reversible phosphorylation-driven interconversion between leak and voltage-dependent gating reframed TREK-1 as a dynamically regulated channel rather than a static background conductance.","evidence":"Single-channel recording of native hippocampal and cloned channels","pmids":["11319556"],"confidence":"High","gaps":["Kinase/phosphatase set governing interconversion in native cells not fully mapped"]},{"year":2001,"claim":"Identification of the PKG site Ser351 showed that NO/cGMP signaling activates TREK-1 independently of the inhibitory PKA pathway, establishing antagonistic phospho-regulation.","evidence":"Patch-clamp in COS cells with Ser351 mutagenesis and cGMP donors","pmids":["11560940"],"confidence":"High","gaps":["In vivo settings where PKG regulation dominates not defined"]},{"year":2004,"claim":"Mapping the C-terminal phospholipid-sensing cluster and proton sensor E306 unified lipid, pressure, and pH gating into a single membrane-interaction mechanism.","evidence":"Patch-clamp with E306 and charged-cluster mutagenesis","pmids":["15577940"],"confidence":"High","gaps":["Structural geometry of C-terminus/membrane interaction not solved","Did not separate PIP2 from other phospholipid contributions quantitatively"]},{"year":2004,"claim":"Knockout mice established that TREK-1 is physiologically required for PUFA neuroprotection and volatile anesthetic action, moving the channel from in vitro pharmacology to validated in vivo target.","evidence":"Trek1-/- mice in ischemia, epilepsy, and anesthesia paradigms","pmids":["15175651"],"confidence":"High","gaps":["Cell types mediating each phenotype not dissected","Compensation by other K2P channels not excluded"]},{"year":2005,"claim":"The sequential PKA-then-PKC phosphorylation model explained how Gq-coupled receptors inhibit TREK-1 through coordinated Ser333/Ser300 modification.","evidence":"Patch-clamp in HEK293 with combinatorial S300/S333 mutagenesis and kinase inhibitors","pmids":["16006563"],"confidence":"High","gaps":["Order and stoichiometry of phosphorylation in native cells not directly measured"]},{"year":2005,"claim":"Linking E306 and the N-terminus to antidepressant block, and showing TREK-1 reshapes the actin cytoskeleton, connected the channel's chemical sensors to drug action and cell morphology.","evidence":"Patch-clamp with E306A/truncation mutants (fluoxetine) and live-cell imaging of cytoskeletal protrusions","pmids":["15685212","15976821","21740918"],"confidence":"High","gaps":["Mechanism by which a K+ channel remodels actin independent of permeation unresolved","Direct fluoxetine binding site not structurally defined"]},{"year":2006,"claim":"Behavioral knockout studies established TREK-1 as a regulator of serotonergic mood signaling and of polymodal pain thresholds, defining its CNS and sensory roles.","evidence":"Trek1-/- mice in depression models and single-fiber/behavioral pain assays","pmids":["16906152","16675954"],"confidence":"High","gaps":["Circuit-level mechanism linking TREK-1 loss to 5-HT efficacy not mapped","Neuronal populations driving pain phenotypes not isolated"]},{"year":2008,"claim":"Resolving external pH gating via His87/His141 and Glu84 defined a selectivity-filter (C-type) gate distinct from the intracellular proton sensor, giving TREK-1 bidirectional pH control.","evidence":"Patch-clamp with external-loop and filter mutagenesis plus ion selectivity measurements","pmids":["18474599"],"confidence":"High","gaps":["Structural coupling between external protonation and filter collapse inferred, not directly visualized"]},{"year":2009,"claim":"Dual TREK-1/TRAAK knockout work extended mechanosensitive K2P channels to cold pain thresholds, broadening TREK-1's thermosensory range.","evidence":"Trek1/Traak knockout mice with behavioral and single-fiber recordings","pmids":["19279663"],"confidence":"High","gaps":["Relative contribution of TREK-1 vs TRAAK to cold sensing not separated"]},{"year":2012,"claim":"Discovery that Gβγ binds the TREK-1 N-terminus to open the channel revealed a non-vesicular glutamate release mechanism downstream of Gi-coupled GPCRs in astrocytes.","evidence":"Reciprocal Co-IP, sniffer-patch glutamate detection, immunoEM, and shRNA in astrocytes","pmids":["23021213"],"confidence":"High","gaps":["Structural basis of Gβγ/N-terminus interaction not solved","How K+ channel opening produces glutamate efflux mechanistically unresolved"]},{"year":2013,"claim":"Reconstitution of purified TREK-1 in liposomes proved intrinsic mechanosensitivity, settling whether tension gating requires accessory proteins.","evidence":"Purified channel reconstituted in giant liposomes with patch-clamp under pressure","pmids":["23897808"],"confidence":"High","gaps":["Conformational changes linking tension to gate not directly imaged"]},{"year":2013,"claim":"Mapping morphine analgesia to TREK-1 while sparing constipation, respiratory depression, and dependence identified the channel as a route to dissociate opioid benefit from harm.","evidence":"Trek1-/- mice across analgesic and adverse-effect assays","pmids":["24346231"],"confidence":"High","gaps":["Neuronal circuit coupling MOR to TREK-1 in analgesia not defined"]},{"year":2014,"claim":"Identifying βIV-spectrin as a targeting partner and the disulfide-linked TWIK-1/TREK-1 heterodimer established that TREK-1 surface delivery and channel composition are partner-dependent in cardiomyocytes and astrocytes.","evidence":"Co-IP, Cys mutagenesis, qv4J mouse electrophysiology, and gene silencing","pmids":["24445605","24496152"],"confidence":"High","gaps":["Trafficking machinery downstream of βIV-spectrin not detailed","Stoichiometry of heterodimer vs homodimer pools in vivo unknown"]},{"year":2016,"claim":"Cardiac conditional knockouts and the βIV-spectrin axis established TREK-1's role in sinoatrial node excitability and rhythm.","evidence":"Cardiomyocyte-specific Kcnk2 deletion and qv4J mice with SAN electrophysiology and localization imaging","pmids":["27098968"],"confidence":"High","gaps":["Quantitative contribution of TREK-1 current to pacemaker potential not isolated"]},{"year":2016,"claim":"Demonstrating functional TREK-1/TREK-2 heterodimers in DRG neurons showed that native K2P pharmacology and biophysics arise from mixed-subunit channels.","evidence":"Tandem constructs, Co-IP, and ruthenium red pharmacology in oocytes and DRG neurons","pmids":["27129242"],"confidence":"High","gaps":["Physiological prevalence of heterodimers across tissues not quantified"]},{"year":2017,"claim":"A disease-associated selectivity-filter mutation conferring Na+ permeability and stretch hypersensitivity linked TREK-1 mechanogating defects to ventricular tachycardia.","evidence":"Patch-clamp of mutant channel, selectivity and stretch assays, and cardiac modeling","pmids":["28242754"],"confidence":"High","gaps":["Single-patient genetic context; broader causal validation in families not described in corpus"]},{"year":2018,"claim":"Cell-type-specific knockouts revealed a fibroblast-autonomous, JNK-linked role for TREK-1 in pressure-overload cardiac fibrosis, distinct from its cardiomyocyte functions.","evidence":"Fibroblast- vs cardiomyocyte-specific conditional knockout in pressure overload with JNK and fibrosis readouts","pmids":["30153110"],"confidence":"High","gaps":["How TREK-1 conductance couples to JNK activation in fibroblasts not mechanistically defined"]},{"year":2019,"claim":"Hippocampal knockout analysis tied TREK-1 loss to altered spine morphology, synaptic transmission, occluded LTP, and memory deficits, defining its cognitive role.","evidence":"Trek1 knockout mice with patch-clamp, LTP recordings, spine morphology, and behavioral memory testing","pmids":["31728930"],"confidence":"High","gaps":["Whether synaptic changes are cell-autonomous or network adaptations not separated"]},{"year":2019,"claim":"A PLD2/phosphatidic acid model proposed that palmitate-mediated localization generates local lipid second messengers gating TREK-1, offering a shared route for mechanical and anesthetic activation.","evidence":"Lipid biochemistry and membrane localization with PA gating assays","pmids":["31672538"],"confidence":"Medium","gaps":["Full reconstitution and mutagenesis evidence not described","Single-lab model awaiting independent confirmation"]},{"year":null,"claim":"How TREK-1's distinct sensors (tension, lipids, protons, phosphorylation, Gβγ) converge on a unified gate, and how its K+ conductance mechanistically drives downstream events like astrocytic glutamate release and fibroblast JNK activation, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No integrated structural model of multimodal gating in the corpus","Causal link between K+ flux and non-canonical signaling outputs unexplained"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[3,16,22]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[5,13,16]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[18,21]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[1,5,24]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[15,18,19,33]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[25,33]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[10]}],"pathway":[],"complexes":["TWIK-1/TREK-1 heterodimer","TREK-1/TREK-2 heterodimer","beta-IV-spectrin/TREK-1 complex"],"partners":["KCNK6","KCNK10","SPTBN4","GNB1","OPRM1","COCH"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O95069","full_name":"Potassium channel subfamily K member 2","aliases":["Outward rectifying potassium channel protein TREK-1","TREK-1 K(+) channel subunit","Two pore domain potassium channel TREK1","Two pore potassium channel TPKC1","K2P2.1"],"length_aa":426,"mass_kda":47.1,"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. Converts to voltage-independent 'leak' conductance mode upon stimulation by various stimuli including mechanical membrane stretch, acidic pH, heat and lipids. Reversibly converts between a voltage-insensitive K(+) 'leak' channel and a voltage-dependent outward rectifying K(+) channel in a phosphorylation-dependent manner (By similarity) (PubMed:10321245, PubMed:10784345, PubMed:11319556, PubMed:23169818, PubMed:30573346, PubMed:38605031). Homo- and heterodimerizes to form functional channels with distinct regulatory and gating properties (By similarity). In trigeminal ganglia sensory neurons, the heterodimer of KCNK2/TREK-1 and KCNK18/TRESK inhibits neuronal firing and neurogenic inflammation by stabilizing the resting membrane potential at K(+) equilibrium potential as well as by regulating the threshold of action potentials and the spike frequency (By similarity). At trigeminal A-beta afferent nerves, the heterodimer of KCNK2/TREK-1 and KCNK4/TRAAK is mostly coexpressed at nodes of Ranvier where it conducts voltage-independent mechanosensitive and thermosensitive currents, allowing rapid action potential repolarization, high speed and high frequence saltatory conduction on myelinated nerves to ensure prompt sensory responses (By similarity). In hippocampal astrocytes, the heterodimer of KCNK2/TREK-1 and KCNK1/TWIK-1 allows passive K(+) conductance under basal conditions, but changes ion selectivity and becomes permeable to L-glutamate and Cl(-) ions upon binding to G-protein subunit GNG4 in stimulated astrocytes. Mediates rapid L-glutamate release in response to activation of G-protein-coupled receptors, such as F2R and CNR1 (By similarity). In hippocampal pyramidal neurons, the homodimer of KCNK2/TREK-1 contributes to gamma-aminobutyric acid (GABA) B-induced slow inhibitory postsynaptic potential. Associates with AKAP5 and Gs-protein-coupled receptor B2AR at postsynaptic dense bodies and converts to a leak channel no longer sensitive to stimulation by arachidonic acid, acidic pH or mechanical stress, nor inhibited by Gq-coupled receptors but still under the negative control of Gs-coupled receptors (By similarity). Permeable to other monovalent cations such as Rb(+) and Cs(+) (By similarity) Does not display channel activity but reduces the channel activity of isoform 1 and isoform 2 and reduces cell surface expression of isoform 2","subcellular_location":"Cell projection, axon; Cell projection, dendrite; Postsynaptic density membrane; Cell membrane, sarcolemma","url":"https://www.uniprot.org/uniprotkb/O95069/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KCNK2","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/KCNK2","total_profiled":1310},"omim":[{"mim_id":"621367","title":"CARDIAC CONDUCTION DISEASE WITH OR WITHOUT CARDIOMYOPATHY 2; CCCM2","url":"https://www.omim.org/entry/621367"},{"mim_id":"618848","title":"MUSCULAR DYSTROPHY, LIMB-GIRDLE, AUTOSOMAL RECESSIVE 26; LGMDR26","url":"https://www.omim.org/entry/618848"},{"mim_id":"607370","title":"POTASSIUM CHANNEL, SUBFAMILY K, MEMBER 17; KCNK17","url":"https://www.omim.org/entry/607370"},{"mim_id":"607369","title":"POTASSIUM CHANNEL, SUBFAMILY K, MEMBER 16; KCNK16","url":"https://www.omim.org/entry/607369"},{"mim_id":"605873","title":"POTASSIUM CHANNEL, SUBFAMILY K, MEMBER 10; KCNK10","url":"https://www.omim.org/entry/605873"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"adrenal gland","ntpm":50.1}],"url":"https://www.proteinatlas.org/search/KCNK2"},"hgnc":{"alias_symbol":["K2p2.1","TREK-1"],"prev_symbol":[]},"alphafold":{"accession":"O95069","domains":[{"cath_id":"1.10.287.70","chopping":"49-129_139-321","consensus_level":"medium","plddt":89.7199,"start":49,"end":321}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95069","model_url":"https://alphafold.ebi.ac.uk/files/AF-O95069-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O95069-F1-predicted_aligned_error_v6.png","plddt_mean":76.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KCNK2","jax_strain_url":"https://www.jax.org/strain/search?query=KCNK2"},"sequence":{"accession":"O95069","fasta_url":"https://rest.uniprot.org/uniprotkb/O95069.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95069/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95069"}},"corpus_meta":[{"pmid":"15175651","id":"PMC_15175651","title":"TREK-1, a K+ channel 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Prostaglandin E2 and cAMP reverse thermal opening via PKA-mediated phosphorylation of Ser333.\",\n      \"method\": \"Patch-clamp electrophysiology, site-directed mutagenesis (Ser333)\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct electrophysiology with mutagenesis identifying the specific phosphorylation site, replicated in multiple studies\",\n      \"pmids\": [\"10835347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Lysophospholipids (e.g., lysophosphatidylcholine) activate TREK-1 in cell-attached patches but not excised patches, indicating indirect activation requiring a cytosolic factor; the carboxyl-terminal region of TREK-1 (not the amino terminus or extracellular M1P1 loop) is critically required for LPC activation.\",\n      \"method\": \"Patch-clamp electrophysiology (cell-attached and excised patches), C-terminal deletion mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct electrophysiology with systematic domain deletion mutagenesis identifying the C-terminal requirement\",\n      \"pmids\": [\"10744694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Riluzole transiently activates TREK-1 followed by inhibition; the inhibitory phase is due to riluzole-induced increase in intracellular cAMP leading to PKA-dependent phosphorylation. TREK-1 mutants lacking the PKA phosphorylation serine residue are activated in a sustained manner by riluzole.\",\n      \"method\": \"Whole-cell patch-clamp, site-directed mutagenesis of PKA phosphorylation site\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — electrophysiology combined with mutagenesis identifying PKA site, mechanistically detailed\",\n      \"pmids\": [\"10779373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Phosphorylation of native hippocampal and cloned KCNK2 channels produces reversible interconversion between leak (background) and voltage-dependent phenotypes, demonstrating dynamic regulation of channel gating by phosphorylation.\",\n      \"method\": \"Single-channel patch-clamp recording of native hippocampal and recombinant KCNK2 channels\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct single-channel recordings on both native and cloned channels showing reversible state interconversion\",\n      \"pmids\": [\"11319556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"TREK-1 is regulated by NO/cGMP pathway: sodium nitroprusside and 8-Br-cGMP increase TREK-1 currents, and mutation of the PKG consensus site at serine 351 abolishes this stimulatory effect without affecting PKA-mediated inhibition.\",\n      \"method\": \"Whole-cell and single-channel patch-clamp in COS cells expressing TREK-1, site-directed mutagenesis (Ser351)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — electrophysiology with specific mutagenesis identifying PKG phosphorylation site\",\n      \"pmids\": [\"11560940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Membrane phospholipids including PIP2 control TREK-1 gating; a positively charged cluster in the C-terminal domain is the phospholipid-sensing domain that interacts with the plasma membrane. Proton sensor E306 in this region is required for activation by cytosolic acidosis; protonation of E306 tightens channel-phospholipid interaction and opens TREK-1 at atmospheric pressure.\",\n      \"method\": \"Patch-clamp electrophysiology, site-directed mutagenesis (E306 and C-terminal charged cluster)\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — electrophysiology with mutagenesis identifying both the phospholipid-sensing domain and the proton sensor residue\",\n      \"pmids\": [\"15577940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TREK-1 knockout mice show increased sensitivity to ischemia and epilepsy; neuroprotection by polyunsaturated fatty acids (PUFAs) is abolished in Trek1−/− mice, establishing TREK-1 as essential for PUFA-mediated neuroprotection.\",\n      \"method\": \"Genetic knockout mouse model, ischemia and epilepsy models in vivo\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with specific mechanistic phenotype (loss of PUFA neuroprotection), replicated across multiple experimental paradigms\",\n      \"pmids\": [\"15175651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Trek1−/− mice are resistant to volatile anesthetic-induced anesthesia, establishing TREK-1 as a functional target of volatile anesthetics in vivo.\",\n      \"method\": \"Genetic knockout mouse model, anesthesia sensitivity testing\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout phenotype specifically demonstrates TREK-1 is required for volatile anesthetic action in vivo\",\n      \"pmids\": [\"15175651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Activation of Gαq-coupled receptors (thyrotropin-releasing hormone receptor, Orexin receptor) inhibits TREK-1 via PKC. A sequential phosphorylation model was established: PKA phosphorylates Ser333, which enables subsequent phosphorylation at Ser300, together inhibiting channel activity. S333A and S300A mutations enhance basal current; S333D and S300D mimick phosphorylation and reduce currents.\",\n      \"method\": \"Whole-cell patch-clamp in HEK293 cells, pharmacological PKC/PKA inhibitors, systematic mutagenesis of Ser300 and Ser333\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple mutagenesis combinations plus pharmacological validation establishing sequential phosphorylation mechanism\",\n      \"pmids\": [\"16006563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Fluoxetine and norfluoxetine inhibit human TREK-1 (IC50 19 μM and 9 μM, respectively) in a voltage-independent manner. The E306A mutation reduces fluoxetine inhibition (~40% block vs. 84%), linking the intracellular proton sensor to drug sensitivity. C-terminal truncation does not affect fluoxetine block.\",\n      \"method\": \"Whole-cell patch-clamp in tsA201 cells, systematic C-terminal truncation and E306A mutagenesis\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — electrophysiology with mutagenesis identifying residues mediating drug inhibition\",\n      \"pmids\": [\"15685212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"TREK-1 expression markedly alters the cytoskeletal network and induces formation of actin- and ezrin-rich membrane protrusions. Cytoskeletal remodeling requires the PKA phosphorylation site S333 and proton sensor E306 but is independent of channel permeation. Conversely, the actin cytoskeleton tonically represses TREK-1 mechanosensitivity.\",\n      \"method\": \"Live-cell imaging, fluorescence microscopy, mutagenesis (S333, E306), genetic inactivation of TREK-1 in striatal neurons\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (imaging, mutagenesis, KO neurons) establishing bidirectional TREK-1/actin cytoskeleton interaction\",\n      \"pmids\": [\"15976821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Deletion of TREK-1 (Kcnk2−/−) in mice leads to increased efficacy of serotonin (5-HT) neurotransmission and resistance to depression in five behavioral models, with reduced stress-induced corticosterone elevation, establishing TREK-1 as a regulator of 5-HT signaling and mood.\",\n      \"method\": \"Genetic knockout mouse model, five depression behavioral models, neurochemical (corticosterone) measurements\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO validated in five independent depression models with neurochemical endpoint\",\n      \"pmids\": [\"16906152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Trek1−/− mice display increased sensitivity to painful heat near the noxious threshold, increased sensitivity to low-threshold mechanical stimuli, and increased thermal/mechanical hyperalgesia under inflammation. Polymodal C-fibers in KO mice are more heat sensitive, establishing TREK-1 as a molecular sensor for polymodal pain.\",\n      \"method\": \"Genetic knockout mouse model, single-fiber recordings, behavioral pain assays, inflammation models\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO combined with single-fiber electrophysiology across multiple pain modalities\",\n      \"pmids\": [\"16675954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"External acidification inhibits human K2P2.1 (TREK-1) by inducing C-type gating closure. Histidine residues His87 and His141 in the first external loop govern this pH response; protonation generates local positive charge that draws Glu84 away from its interactions, collapsing the selectivity filter. Mutation S164Y accelerates C-type gating.\",\n      \"method\": \"Whole-cell patch-clamp, site-directed mutagenesis of His87, His141, Glu84, S164Y; ion selectivity measurements\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — electrophysiology with multiple mutagenesis experiments identifying pH-sensing mechanism and C-type gating residues\",\n      \"pmids\": [\"18474599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TRAAK and TREK-1 channels (mechano-gated K+ channels) control both heat and cold pain thresholds in mice. TREK-1 and TRAAK together regulate nociceptor activation by cold, particularly in menthol-insensitive neurons.\",\n      \"method\": \"Genetic knockout mice for TREK-1 and TRAAK, behavioral thermal and mechanical pain assays, single-fiber recordings\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — dual KO model with behavioral and electrophysiological characterization across multiple temperature ranges\",\n      \"pmids\": [\"19279663\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TREK-1 mediates fast, nonvesicular glutamate release from astrocytes upon GPCR activation. The mechanism requires Gαi activation, dissociation of Gβγ, and direct interaction of Gβγ with the N-terminus of TREK-1 to open the channel. TREK-1 is preferentially localized at astrocyte cell body and processes (not microdomains near synapses).\",\n      \"method\": \"Co-immunoprecipitation (Gβγ–TREK-1 N-terminus interaction), sniffer-patch glutamate detection, immunoelectron microscopy, shRNA knockdown, GPCR pharmacology\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP identifying direct Gβγ–TREK-1 interaction, combined with functional sniffer-patch and ultrastructural localization in single rigorous study\",\n      \"pmids\": [\"23021213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Purified mouse TREK-1 reconstituted in giant liposomes is directly sensitive to membrane tension: intrinsic lipid bilayer tension is sufficient to maximally activate the channel, and positive pressure closes it. This demonstrates TREK-1 is an intrinsically mechanosensitive channel requiring no accessory proteins.\",\n      \"method\": \"Protein purification from yeast, reconstitution in giant liposomes, patch-clamp electrophysiology\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution of purified channel in defined lipid bilayer with direct mechanical gating, establishing intrinsic mechanosensitivity\",\n      \"pmids\": [\"23897808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TREK-1 mediates morphine-induced analgesia downstream of μ-opioid receptor signaling in mice, but is not involved in morphine-induced constipation, respiratory depression, or dependence, separating analgesic from adverse opioid effects.\",\n      \"method\": \"Genetic knockout mouse model (Trek1−/−), behavioral pain assays, opioid adverse-effect assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO model with selective dissociation of analgesic vs. adverse opioid effects across multiple endpoints\",\n      \"pmids\": [\"24346231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Native TWIK-1 and TREK-1 form a functional heterodimeric channel in astrocytes via a disulfide bridge between TWIK-1 Cys69 and TREK-1 Cys93. Surface expression of TWIK-1 and TREK-1 are interdependent. The TWIK-1/TREK-1 heterodimer mediates astrocytic passive conductance and cannabinoid-induced glutamate release.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis of Cys69/Cys93, gene silencing, patch-clamp electrophysiology, glutamate release assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — biochemical identification of disulfide bond with mutagenesis confirmation, functional validation by gene silencing and electrophysiology\",\n      \"pmids\": [\"24496152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"βIV-spectrin, an actin-associated protein, colocalizes with TREK-1 at the myocyte intercalated disc, physically associates with TREK-1, and is required for TREK-1 membrane targeting. Mice expressing βIV-spectrin lacking TREK-1 binding (qv4J) display aberrant TREK-1 membrane localization, decreased TREK-1 activity, delayed action potential repolarization, and arrhythmia.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence colocalization, functional electrophysiology in qv4J mice, action potential recordings\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP establishing physical association, genetic mouse model confirming membrane targeting role with arrhythmia phenotype\",\n      \"pmids\": [\"24445605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"βIV-spectrin/TREK-1 complex is required for normal sinoatrial node cell excitability. Cardiomyocyte-specific deletion of TREK-1 causes sinoatrial dysfunction with bradycardia and sinus pauses under stress. Loss of βIV-spectrin (qv4J mice) disrupts normal TREK-1 membrane localization in sinoatrial cells.\",\n      \"method\": \"Cardiac-specific conditional knockout mice (αMHC-Kcnk2f/f), action potential measurements, sinoatrial node cell electrophysiology, TREK-1 localization imaging\",\n      \"journal\": \"Journal of the American Heart Association\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KO with electrophysiological characterization and localization data\",\n      \"pmids\": [\"27098968\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TREK-1 and TREK-2 subunits form functional heterodimers in heterologous expression and in native dorsal root ganglion neurons. The TREK-1/TREK-2 heterodimer has unique biophysical and pharmacological properties (single-channel conductance intermediate between homodimers; ruthenium red sensitivity intermediate between TREK-1 and TREK-2). Assembly confirmed by co-immunoprecipitation.\",\n      \"method\": \"Tandem-construct expression, co-immunoprecipitation of epitope-tagged subunits in Xenopus oocytes, patch-clamp electrophysiology, ruthenium red pharmacology in DRG neurons\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct Co-IP confirmation of heterodimer assembly, functional tandem construct characterization, and native tissue validation\",\n      \"pmids\": [\"27129242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A heterozygous point mutation in the selectivity filter of TREK-1 introduces abnormal sodium permeability and hypersensitivity to stretch-activation, associated with ventricular tachycardia. This indicates the selectivity filter is directly involved in stretch-induced activation and desensitization.\",\n      \"method\": \"Patch-clamp electrophysiology of mutant TREK-1, ion selectivity measurements, stretch-activation assays, computational cardiac modeling\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — electrophysiology with specific disease mutation revealing dual role of selectivity filter in ion selectivity and mechanogating, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"28242754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cardiac fibroblast-specific (not cardiomyocyte-specific) TREK-1 deletion prevents pressure overload-induced cardiac dysfunction. Loss of TREK-1 in fibroblasts is associated with diminished cardiac fibrosis and reduced JNK activation in both cardiomyocytes and fibroblasts.\",\n      \"method\": \"Cell-type-specific conditional knockout mice, pressure overload model, cardiac function assessment, JNK signaling analysis, fibrosis measurements\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KO dissecting fibroblast vs. cardiomyocyte roles, with defined molecular pathway (JNK) and cardiac functional endpoint\",\n      \"pmids\": [\"30153110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Phospholipase D2 (PLD2) localizes to TREK-1 through palmitate-mediated lipid compartmentalization and generates local high concentrations of phosphatidic acid (PA) that gates TREK-1. Disruption of palmitate-mediated PLD2 localization is proposed as a shared pathway for both mechanical force and anesthetic activation of TREK-1.\",\n      \"method\": \"Lipid biochemistry, membrane localization experiments, channel gating assays with PA\",\n      \"journal\": \"Biochimica et biophysica acta. Biomembranes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — mechanistic model supported by localization and lipid experiments from single lab, but full reconstitution/mutagenesis evidence not described in abstract\",\n      \"pmids\": [\"31672538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TREK-1 splice variant TREK-1e (lacking transmembrane domains M3/M4 and second pore domain) is retained in the endoplasmic reticulum and reduces surface expression and current density of full-length TREK-1 when co-expressed. Residues I204 and W205 in the C-terminus of TREK-1e mediate ER retention.\",\n      \"method\": \"Live-cell imaging of GFP-tagged constructs, surface expression assays, mutagenesis of ER retention signal, electrophysiology in Xenopus oocytes, reporter fusion constructs\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods (imaging, mutagenesis, electrophysiology, reporter assays) in single lab establishing ER retention mechanism\",\n      \"pmids\": [\"24196565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TREK-1 alternative translation initiation generates two isoforms; the truncated isoform (TREK-1[ΔN52]) lacking the first 52 amino acids shows reduced K+ selectivity and 70% reduced sensitivity to fluoxetine inhibition, indicating the N-terminal 52 amino acids are essential for fluoxetine sensitivity.\",\n      \"method\": \"Electrophysiology (HEK-293 cells and Xenopus oocytes), alternative translation initiation mutagenesis (TREK-1[M53I], TREK-1[ΔN52])\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — electrophysiology with engineered N-terminal isoforms identifying the structural determinant of fluoxetine sensitivity\",\n      \"pmids\": [\"21740918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In pituitary corticotropes, arginine vasopressin suppresses background TREK-1 current via PKC activation, causing membrane depolarization. AVP and CRH have additive effects on TREK-1 current suppression via PKC and PKA pathways respectively, resulting in greater depolarization and potentiated ACTH secretion.\",\n      \"method\": \"Perforated patch-clamp in mouse corticotropes, pharmacological PKC inhibition, PKA pathway activation, Ca2+ buffering experiments\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct electrophysiology in native cells with pharmacological dissection of PKC vs. PKA contributions to TREK-1 regulation\",\n      \"pmids\": [\"26248219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Activation of astrocytic μ-opioid receptor (MOR) by DAMGO causes fast glutamate release via TREK-1-containing K2P channels. MOR and TREK-1 are co-localized in astrocyte soma and processes. Glutamate release is reduced by TREK-1 gene silencing and absent in MOR-deficient astrocytes.\",\n      \"method\": \"Sniffer-patch glutamate detection, shRNA gene silencing of TREK-1, MOR-deficient mice, immunofluorescence colocalization\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional glutamate release assay combined with genetic silencing and KO validation, with localization data\",\n      \"pmids\": [\"30319359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Trek-1 deficiency in alveolar epithelial cells decreases IL-6 secretion via reduced p38 phosphorylation and impaired PKCθ phosphorylation, without affecting Ca2+ signaling. This places TREK-1 upstream of p38 and Ca2+-independent PKC isoforms in the cytokine secretion pathway.\",\n      \"method\": \"shRNA-mediated Trek-1 knockdown in mouse and human AECs, western blot analysis of signaling intermediates (p38, multiple PKC isoforms), ELISA for IL-6, pharmacological inhibition\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with pathway analysis using multiple phosphorylation markers, single lab\",\n      \"pmids\": [\"23275623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TREK-1 activity in astrocytes supports glutamate clearance capacity; suppression of TREK-1 activity inhibits glutamate clearance and enhances astrocyte-derived S100β secretion after ischemic insult, leading to increased neuronal apoptosis.\",\n      \"method\": \"TREK-1 pharmacological inhibition in cultured astrocytes, glutamate uptake assay, S100β ELISA, neuronal apoptosis assay, simulated ischemia model\",\n      \"journal\": \"Journal of molecular neuroscience : MN\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — pharmacological inhibition approach with functional cellular readouts, single lab\",\n      \"pmids\": [\"22895843\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Interaction of cochlin (extracellular matrix protein) with TREK-1 in trabecular meshwork cells regulates intraocular pressure. Multimeric cochlin (formed under high shear stress) reduces TREK-1 current, whereas monomeric cochlin does not. TREK-1 silencing in mice prevents cochlin overexpression-mediated IOP increase.\",\n      \"method\": \"Biochemical co-immunoprecipitation/interaction assays, electrophysiology, TREK-1 silencing in mice, IOP measurements\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical and electrophysiological demonstration of cochlin-TREK-1 interaction with in vivo IOP validation, single lab\",\n      \"pmids\": [\"28352076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TREK-1 KO increases dendritic sprouting, immature spine number, neuronal excitability, and both excitatory and inhibitory postsynaptic currents in hippocampal CA1 pyramidal neurons. Increased EPSCs are attributed to increased presynaptic glutamate release probability and enhanced postsynaptic AMPA receptor expression. TREK-1 KO occludes LTP and causes recognition memory deficit.\",\n      \"method\": \"TREK-1 knockout mice, patch-clamp electrophysiology, LTP recordings, morphological analysis of dendritic spines, behavioral memory testing\",\n      \"journal\": \"Molecular neurobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with multiple orthogonal electrophysiological and behavioral endpoints, identifying specific synaptic mechanisms\",\n      \"pmids\": [\"31728930\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TREK-1 splice variants from preterm labor myometrium interact with full-length wild-type TREK-1; co-immunoprecipitation demonstrates physical interaction. Wild-type TREK-1 is located at the plasma membrane, while splice variants (lacking pore or transmembrane domains) distribute throughout the cell and cause wild-type TREK-1 to redistribute from membrane to cytoplasm when co-expressed.\",\n      \"method\": \"Co-immunoprecipitation of FLAG/His-tagged constructs, subcellular localization imaging in HEK293T cells\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and localization data, but functional channel activity of variants not established, single lab\",\n      \"pmids\": [\"22811574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Pharmacological differentiation: ruthenium red (RR) inhibits TREK-2 (IC50 = 0.2 μM) but not TREK-1; mutation I110D in TREK-1 (corresponding to D135 in TREK-2 within the extracellular ion pathway) renders TREK-1 sensitive to RR, identifying the extracellular cap residue as the structural determinant of RR sensitivity.\",\n      \"method\": \"Two-electrode voltage clamp (Xenopus oocytes), whole-cell patch clamp (DRG neurons), site-directed mutagenesis (I110D in TREK-1)\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — gain-of-function mutagenesis pinpointing structural basis for pharmacological difference, validated in native neurons\",\n      \"pmids\": [\"25409575\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TREK-1 (KCNK2/K2P2.1) is a polymodally regulated two-pore-domain background K+ channel that is intrinsically mechanosensitive (directly gated by membrane tension), activated by heat, polyunsaturated fatty acids, lysophospholipids, intracellular acidosis via proton sensor E306, and volatile anesthetics, and inhibited by PKA phosphorylation at Ser333 (enabling sequential phosphorylation at Ser300), PKC phosphorylation (Ser300/Ser333, downstream of Gq-coupled receptors), and PKG phosphorylation at Ser351; its surface expression and membrane targeting are controlled by βIV-spectrin in cardiomyocytes and by a disulfide-linked TWIK-1 heterodimer in astrocytes; in astrocytes, Gβγ directly interacts with the TREK-1 N-terminus downstream of Gi-coupled GPCRs to mediate fast non-vesicular glutamate release; in neurons, TREK-1 sets resting membrane potential and its loss increases excitability, impairs LTP, and disrupts cognitive function; in vivo, TREK-1 is essential for PUFA-mediated neuroprotection, volatile anesthetic action, morphine analgesia, serotonin-dependent mood regulation, and cardiac sinoatrial node excitability.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"KCNK2 (TREK-1) is a polymodally gated two-pore-domain background K+ channel that sets resting membrane potential and integrates physical and chemical stimuli into changes in K+ conductance [#3, #16]. The channel is intrinsically mechanosensitive: purified TREK-1 reconstituted in liposomes is gated directly by membrane bilayer tension without accessory proteins, and its selectivity filter participates in both ion selectivity and stretch-induced gating/desensitization [#16, #22]. It is also activated by heat [#0], lysophospholipids acting through its C-terminus [#1], and membrane phospholipids including PIP2, with a C-terminal positively charged cluster serving as the phospholipid-sensing domain and the proton sensor E306 mediating activation by intracellular acidosis [#5]. External acidification conversely closes the channel through C-type gating governed by external-loop histidines [#13]. TREK-1 gating is reversibly tuned by phosphorylation, interconverting leak and voltage-dependent behaviors [#3]: PKA phosphorylation of Ser333 enables sequential phosphorylation at Ser300 to inhibit the channel downstream of Gq/PKC signaling, while PKG phosphorylation at Ser351 activates it via the NO/cGMP pathway [#8, #4]. Channel surface expression and assembly are controlled by partners and isoforms — \\u03b2IV-spectrin targets TREK-1 to cardiomyocyte membranes [#19], a disulfide-linked TWIK-1/TREK-1 heterodimer forms in astrocytes [#18], TREK-1/TREK-2 heterodimers arise in sensory neurons [#21], and N-terminally truncated or pore-deficient splice variants are ER-retained and suppress surface expression of full-length channel [#25]. Functionally, TREK-1 is essential in vivo for PUFA-mediated neuroprotection and volatile anesthetic action [#6, #7], polymodal heat/cold/mechanical pain sensing [#12, #14], morphine analgesia [#17], serotonin-dependent mood regulation [#11], hippocampal excitability, LTP, and memory [#32], and cardiac sinoatrial excitability [#20]. In astrocytes, Gi-coupled GPCR activation releases G\\u03b2\\u03b3, which binds the TREK-1 N-terminus to drive fast non-vesicular glutamate release [#15, #28].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Establishing that TREK-1 is a thermosensitive channel under cAMP/PKA control answered how a background K+ channel could couple temperature to neuronal signaling and be switched off by GPCR signaling.\",\n      \"evidence\": \"Patch-clamp with Ser333 mutagenesis in heterologous cells\",\n      \"pmids\": [\"10835347\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how thermal energy is transduced to the gate\", \"Physiological temperature range relevance untested in vivo at this stage\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Domain mapping of lysophospholipid and riluzole responses localized lipid-sensing to the C-terminus and confirmed PKA phosphorylation as a dominant inhibitory switch.\",\n      \"evidence\": \"Cell-attached vs excised patch recording, C-terminal deletions, and PKA-site mutagenesis\",\n      \"pmids\": [\"10744694\", \"10779373\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the cytosolic factor required for LPC activation not defined\", \"Did not establish direct vs indirect lipid binding\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrating reversible phosphorylation-driven interconversion between leak and voltage-dependent gating reframed TREK-1 as a dynamically regulated channel rather than a static background conductance.\",\n      \"evidence\": \"Single-channel recording of native hippocampal and cloned channels\",\n      \"pmids\": [\"11319556\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase/phosphatase set governing interconversion in native cells not fully mapped\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identification of the PKG site Ser351 showed that NO/cGMP signaling activates TREK-1 independently of the inhibitory PKA pathway, establishing antagonistic phospho-regulation.\",\n      \"evidence\": \"Patch-clamp in COS cells with Ser351 mutagenesis and cGMP donors\",\n      \"pmids\": [\"11560940\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo settings where PKG regulation dominates not defined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Mapping the C-terminal phospholipid-sensing cluster and proton sensor E306 unified lipid, pressure, and pH gating into a single membrane-interaction mechanism.\",\n      \"evidence\": \"Patch-clamp with E306 and charged-cluster mutagenesis\",\n      \"pmids\": [\"15577940\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural geometry of C-terminus/membrane interaction not solved\", \"Did not separate PIP2 from other phospholipid contributions quantitatively\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Knockout mice established that TREK-1 is physiologically required for PUFA neuroprotection and volatile anesthetic action, moving the channel from in vitro pharmacology to validated in vivo target.\",\n      \"evidence\": \"Trek1-/- mice in ischemia, epilepsy, and anesthesia paradigms\",\n      \"pmids\": [\"15175651\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell types mediating each phenotype not dissected\", \"Compensation by other K2P channels not excluded\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"The sequential PKA-then-PKC phosphorylation model explained how Gq-coupled receptors inhibit TREK-1 through coordinated Ser333/Ser300 modification.\",\n      \"evidence\": \"Patch-clamp in HEK293 with combinatorial S300/S333 mutagenesis and kinase inhibitors\",\n      \"pmids\": [\"16006563\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Order and stoichiometry of phosphorylation in native cells not directly measured\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Linking E306 and the N-terminus to antidepressant block, and showing TREK-1 reshapes the actin cytoskeleton, connected the channel's chemical sensors to drug action and cell morphology.\",\n      \"evidence\": \"Patch-clamp with E306A/truncation mutants (fluoxetine) and live-cell imaging of cytoskeletal protrusions\",\n      \"pmids\": [\"15685212\", \"15976821\", \"21740918\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which a K+ channel remodels actin independent of permeation unresolved\", \"Direct fluoxetine binding site not structurally defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Behavioral knockout studies established TREK-1 as a regulator of serotonergic mood signaling and of polymodal pain thresholds, defining its CNS and sensory roles.\",\n      \"evidence\": \"Trek1-/- mice in depression models and single-fiber/behavioral pain assays\",\n      \"pmids\": [\"16906152\", \"16675954\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Circuit-level mechanism linking TREK-1 loss to 5-HT efficacy not mapped\", \"Neuronal populations driving pain phenotypes not isolated\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Resolving external pH gating via His87/His141 and Glu84 defined a selectivity-filter (C-type) gate distinct from the intracellular proton sensor, giving TREK-1 bidirectional pH control.\",\n      \"evidence\": \"Patch-clamp with external-loop and filter mutagenesis plus ion selectivity measurements\",\n      \"pmids\": [\"18474599\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural coupling between external protonation and filter collapse inferred, not directly visualized\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Dual TREK-1/TRAAK knockout work extended mechanosensitive K2P channels to cold pain thresholds, broadening TREK-1's thermosensory range.\",\n      \"evidence\": \"Trek1/Traak knockout mice with behavioral and single-fiber recordings\",\n      \"pmids\": [\"19279663\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of TREK-1 vs TRAAK to cold sensing not separated\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Discovery that G\\u03b2\\u03b3 binds the TREK-1 N-terminus to open the channel revealed a non-vesicular glutamate release mechanism downstream of Gi-coupled GPCRs in astrocytes.\",\n      \"evidence\": \"Reciprocal Co-IP, sniffer-patch glutamate detection, immunoEM, and shRNA in astrocytes\",\n      \"pmids\": [\"23021213\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of G\\u03b2\\u03b3/N-terminus interaction not solved\", \"How K+ channel opening produces glutamate efflux mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Reconstitution of purified TREK-1 in liposomes proved intrinsic mechanosensitivity, settling whether tension gating requires accessory proteins.\",\n      \"evidence\": \"Purified channel reconstituted in giant liposomes with patch-clamp under pressure\",\n      \"pmids\": [\"23897808\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conformational changes linking tension to gate not directly imaged\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Mapping morphine analgesia to TREK-1 while sparing constipation, respiratory depression, and dependence identified the channel as a route to dissociate opioid benefit from harm.\",\n      \"evidence\": \"Trek1-/- mice across analgesic and adverse-effect assays\",\n      \"pmids\": [\"24346231\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Neuronal circuit coupling MOR to TREK-1 in analgesia not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying \\u03b2IV-spectrin as a targeting partner and the disulfide-linked TWIK-1/TREK-1 heterodimer established that TREK-1 surface delivery and channel composition are partner-dependent in cardiomyocytes and astrocytes.\",\n      \"evidence\": \"Co-IP, Cys mutagenesis, qv4J mouse electrophysiology, and gene silencing\",\n      \"pmids\": [\"24445605\", \"24496152\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trafficking machinery downstream of \\u03b2IV-spectrin not detailed\", \"Stoichiometry of heterodimer vs homodimer pools in vivo unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Cardiac conditional knockouts and the \\u03b2IV-spectrin axis established TREK-1's role in sinoatrial node excitability and rhythm.\",\n      \"evidence\": \"Cardiomyocyte-specific Kcnk2 deletion and qv4J mice with SAN electrophysiology and localization imaging\",\n      \"pmids\": [\"27098968\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of TREK-1 current to pacemaker potential not isolated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrating functional TREK-1/TREK-2 heterodimers in DRG neurons showed that native K2P pharmacology and biophysics arise from mixed-subunit channels.\",\n      \"evidence\": \"Tandem constructs, Co-IP, and ruthenium red pharmacology in oocytes and DRG neurons\",\n      \"pmids\": [\"27129242\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological prevalence of heterodimers across tissues not quantified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"A disease-associated selectivity-filter mutation conferring Na+ permeability and stretch hypersensitivity linked TREK-1 mechanogating defects to ventricular tachycardia.\",\n      \"evidence\": \"Patch-clamp of mutant channel, selectivity and stretch assays, and cardiac modeling\",\n      \"pmids\": [\"28242754\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single-patient genetic context; broader causal validation in families not described in corpus\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Cell-type-specific knockouts revealed a fibroblast-autonomous, JNK-linked role for TREK-1 in pressure-overload cardiac fibrosis, distinct from its cardiomyocyte functions.\",\n      \"evidence\": \"Fibroblast- vs cardiomyocyte-specific conditional knockout in pressure overload with JNK and fibrosis readouts\",\n      \"pmids\": [\"30153110\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TREK-1 conductance couples to JNK activation in fibroblasts not mechanistically defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Hippocampal knockout analysis tied TREK-1 loss to altered spine morphology, synaptic transmission, occluded LTP, and memory deficits, defining its cognitive role.\",\n      \"evidence\": \"Trek1 knockout mice with patch-clamp, LTP recordings, spine morphology, and behavioral memory testing\",\n      \"pmids\": [\"31728930\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether synaptic changes are cell-autonomous or network adaptations not separated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"A PLD2/phosphatidic acid model proposed that palmitate-mediated localization generates local lipid second messengers gating TREK-1, offering a shared route for mechanical and anesthetic activation.\",\n      \"evidence\": \"Lipid biochemistry and membrane localization with PA gating assays\",\n      \"pmids\": [\"31672538\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Full reconstitution and mutagenesis evidence not described\", \"Single-lab model awaiting independent confirmation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TREK-1's distinct sensors (tension, lipids, protons, phosphorylation, G\\u03b2\\u03b3) converge on a unified gate, and how its K+ conductance mechanistically drives downstream events like astrocytic glutamate release and fibroblast JNK activation, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated structural model of multimodal gating in the corpus\", \"Causal link between K+ flux and non-canonical signaling outputs unexplained\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [3, 16, 22]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [5, 13, 16]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [18, 21]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [1, 5, 24]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [15, 18, 19, 33]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [25, 33]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": []}\n    ],\n    \"complexes\": [\n      \"TWIK-1/TREK-1 heterodimer\",\n      \"TREK-1/TREK-2 heterodimer\",\n      \"beta-IV-spectrin/TREK-1 complex\"\n    ],\n    \"partners\": [\n      \"KCNK6\",\n      \"KCNK10\",\n      \"SPTBN4\",\n      \"GNB1\",\n      \"OPRM1\",\n      \"COCH\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}