{"gene":"KCNJ13","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":1999,"finding":"Kir7.1 (KCNJ13) is localized to the basolateral membrane of thyroid follicular cells and the apical membrane of choroid plexus epithelial cells, co-localizing with Na+,K+-ATPase, consistent with functional coupling to recycle K+ for pump activity.","method":"Immunohistochemistry, Northern blot, subcellular fractionation","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-localization by immunohistochemistry in multiple tissues, single lab, no direct functional reconstitution","pmids":["10455019"],"is_preprint":false},{"year":2001,"finding":"Kir7.1 is the molecular basis of the apical membrane K+ conductance in retinal pigment epithelium (RPE): it exhibits mild inward rectification, an inverse dependence on extracellular K+ concentration, and a unitary conductance of ~2 pS. The selectivity sequence is K+ ≈ Rb+ >> Cs+ > Na+ ≈ Li+.","method":"Xenopus oocyte two-electrode voltage-clamp, whole-cell patch-clamp on bovine RPE, non-stationary noise analysis, Northern/Western blot","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro electrophysiology with reconstitution in oocytes corroborated by native RPE recordings, replicated across two independent preparations","pmids":["11230507"],"is_preprint":false},{"year":2001,"finding":"Kir7.1 is localized specifically at the proximal roots of apical processes of RPE cells, co-localizing with Na+,K+-ATPase, and its currents recapitulate the IK(IR) recorded from isolated RPE cells (poor K+-dependence, low Ba2+ sensitivity).","method":"Immunohistochemistry including electron microscopy, RT-PCR, immunoblot, patch-clamp in HEK293T cells","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — subcellular localization by electron microscopy confirmed with electrophysiological validation in heterologous system, replicated findings from co-published RPE study","pmids":["11179389"],"is_preprint":false},{"year":2000,"finding":"Kir7.1 is localized to the basolateral membrane of distal nephron principal cells (DCT, connecting tubule, cortical collecting duct) co-localizing with Na+,K+-ATPase, where it may function in K+ recycling to sustain pump activity.","method":"Western blot, immunohistochemistry, electron microscopic immunocytochemistry, double-labeling immunogold","journal":"Journal of the American Society of Nephrology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electron microscopic immunocytochemistry with double-labeling immunogold, single lab, no direct functional reconstitution","pmids":["11053473"],"is_preprint":false},{"year":2003,"finding":"Kir7.1 constitutes a major component of the apical K+ conductance in bovine RPE, distributed over the length of apical processes, and distinct from Kir4.1, which is absent from RPE.","method":"RT-PCR, Northern blot, Western blot, indirect immunofluorescence","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (RT-PCR, Western, immunofluorescence), single lab","pmids":["12824269"],"is_preprint":false},{"year":2006,"finding":"Mutations in Kir7.1 in zebrafish jaguar/obelix mutants alter K+ channel activity (demonstrated by patch-clamp), impair the melanophore response to sympathetic neuron-derived melanosome dispersion signals, and constitutively activate melanosome aggregation downstream of the alpha2-adrenoceptor pathway.","method":"Positional cloning, patch-clamp electrophysiology, BAC rescue experiment, pigment pattern analysis","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — patch-clamp validation of channel activity, genetic rescue by BAC, epistasis with adrenergic signaling pathway","pmids":["17121467"],"is_preprint":false},{"year":2006,"finding":"The C-terminal length of Kir7.1 is critical for plasma membrane targeting; deletion of 38 or more C-terminal residues causes intracellular retention, an effect rescued by addition of alanine residues to restore C-terminal length.","method":"Deletion mutagenesis, immunofluorescence microscopy, cell-surface biotinylation in MDCK cells","journal":"Cell biology international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis combined with surface biotinylation, single lab, two complementary methods","pmids":["16406822"],"is_preprint":false},{"year":2007,"finding":"Kir7.1 channels are modulated by intracellular pH in a biphasic manner (maximal activity near pH 7.0, inhibited by acidification or alkalinization), and by extracellular acidification. Histidine 26 (H26) in the NH2-terminus is important for channel activation at physiological pHi.","method":"Xenopus oocyte two-electrode voltage-clamp, site-directed mutagenesis of histidine residues","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro electrophysiology with mutagenesis identifying specific residue, single lab","pmids":["18094146"],"is_preprint":false},{"year":2008,"finding":"The R162W mutation in KCNJ13 (SVD-associated) causes Kir7.1 to produce a nonselective cation current instead of selective K+ current, depolarizing transfected cells and increasing cell fragility, establishing a gain-of-toxic-function mechanism for dominant SVD.","method":"Overexpression in CHO-K1 cells, whole-cell patch-clamp, molecular modeling","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — patch-clamp electrophysiology plus structural modeling in heterologous cells, single lab with multiple methods","pmids":["18179896"],"is_preprint":false},{"year":2008,"finding":"Kir7.1 channel activity is dually regulated by PKC (inhibition via Ser201) and PKA (stimulation via Ser287) in the C-terminal domain.","method":"Xenopus oocyte expression, pharmacological PKC/PKA activation/inhibition, site-directed mutagenesis of consensus phosphorylation sites","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro mutagenesis and electrophysiology, single lab, identifies specific residues","pmids":["18976636"],"is_preprint":false},{"year":2012,"finding":"The R162W mutation causes dominant-negative suppression of Kir7.1: co-expression of mutant and WT Kir7.1 cRNA reduces K+ and Rb+ currents to ~17% of WT alone, while the mutant protein still reaches the plasma membrane. The dominant-negative effect may occur by disruption of PIP2 gating.","method":"Xenopus oocyte two-electrode voltage-clamp, immunostaining of oocytes and MDCK cells","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — quantitative electrophysiology with co-injection paradigm, membrane localization confirmed, single lab","pmids":["23255580"],"is_preprint":false},{"year":2013,"finding":"The SVD R162W mutation produces a non-functional Kir channel that depolarizes resting membrane potential upon expression in CHO cells, and co-expression with WT Kir7.1 shows dominant-negative reduction of IKir7.1. Homology modeling suggests loss of hydrogen bonding in the lipid-binding (PIP2) regulatory domain of the cytoplasmic structure.","method":"CHO cell expression, whole-cell patch-clamp, co-expression experiments, homology modeling based on bacterial Kir structure","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — patch-clamp with co-expression, homology modeling; single lab, corroborates concurrent Xenopus oocyte study","pmids":["23977131"],"is_preprint":false},{"year":2014,"finding":"Kir7.1 current hyperpolarizes uterine myocytes and promotes myometrial quiescence during gestation. Labor is associated with decreased Kir7.1 expression. Lentiviral miRNA-mediated knockdown of Kir7.1 increased uterine contractile force and duration, while overexpression inhibited contractility. The Kir7.1 inhibitor VU590 induced prolonged uterine contractions.","method":"Genome-wide screen, computational modeling, lentiviral miRNA knockdown and overexpression, uterine contractility assays, patch-clamp","journal":"EMBO molecular medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — bidirectional functional manipulation (knockdown and overexpression) with defined contractility phenotype, pharmacological validation with VU590, multiple orthogonal methods","pmids":["25056913"],"is_preprint":false},{"year":2015,"finding":"MC4R couples to Kir7.1 in hypothalamic PVN neurons in a G-protein (Gαs)-independent manner: α-MSH closes Kir7.1 (depolarizing neurons) and AgRP acts as a biased agonist opening Kir7.1 (hyperpolarizing neurons), independently of blocking α-MSH binding. This Kir7.1 signaling pathway contributes to melanocortin-mediated regulation of energy homeostasis.","method":"Hypothalamic slice patch-clamp electrophysiology in mice, pharmacological dissection of Gαs pathway, ligand-binding studies","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — electrophysiology in native neurons with pharmacological Gαs-independence demonstrated, multiple ligands tested, published in high-impact journal","pmids":["25600267"],"is_preprint":false},{"year":2015,"finding":"CRISPR-Cas9 mosaic deletion of Kcnj13 in mouse RPE causes photoreceptor degeneration overlying mutant RPE cells, while wild-type RPE cells can rescue photoreceptors overlying mutant RPE; complete loss of Kcnj13 is likely postnatal lethal. This establishes KCNJ13 expression in RPE as required for photoreceptor survival.","method":"CRISPR-Cas9 zygote injection, mosaic analysis, immunofluorescence, electroretinography","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic loss-of-function with defined cell-autonomous vs non-autonomous rescue, ERG functional readout","pmids":["25666713"],"is_preprint":false},{"year":2015,"finding":"A novel nonsense mutation in KCNJ13 (LCA16) truncates the Kir7.1 C-terminus, alters protein localization, and disrupts potassium currents. Heterozygous co-expression of mutant and WT channel has no negative influence on WT channel function (no dominant-negative effect), consistent with recessive inheritance. shRNA suppression of Kir7.1 in mice reproduces the LCA ERG phenotype.","method":"Heterologous expression, patch-clamp electrophysiology, subcellular localization, mouse shRNA knockdown, ERG","journal":"Human mutation","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — electrophysiology, localization, and in vivo ERG phenotype, multiple orthogonal methods, single lab","pmids":["25921210"],"is_preprint":false},{"year":2015,"finding":"Homozygous Kcnj13 knockout mice die hours after birth and exhibit cleft palate and moderate lung developmental retardation, establishing Kir7.1 roles in palatogenesis and respiratory development.","method":"Kcnj13 gene ablation (knockout mouse), histology, developmental analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with defined morphological phenotype, single lab","pmids":["26402555"],"is_preprint":false},{"year":2017,"finding":"Kir7.1 in RPE is required for normal a-, b-, and c-wave ERG responses: shRNA knockdown or pharmacological block with VU590 in vivo reduces all ERG wave amplitudes, whereas VU590 has no effect on isolated retina (without attached RPE), indicating that RPE Kir7.1 controls subretinal K+ homeostasis that is required for photoreceptor and bipolar cell electrophysiology.","method":"In vivo shRNA knockdown, pharmacological block (VU590), ERG, ex vivo isolated retina ERG, patch-clamp of native mouse RPE","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic and pharmacological loss-of-function with tissue-specific controls, multiple ERG endpoints, native cell patch-clamp confirmation","pmids":["28878288"],"is_preprint":false},{"year":2017,"finding":"Oxytocin receptor (OXTR) activation in RPE inhibits Kir7.1 channel activity through a PIP2-dependent capacitative Ca2+ entry mechanism.","method":"Human RPE cell line, HEK293 heterologous OXTR expression, Ca2+ imaging, pharmacological Ca2+ signaling inhibitors, patch-clamp","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional electrophysiology with pharmacological dissection, single lab, two orthogonal approaches","pmids":["28603013"],"is_preprint":false},{"year":2017,"finding":"VU590 inhibits Kir7.1 and Kir1.1 by a voltage- and K+-dependent mechanism within the channel pore. Asparagine 171 (N171) is the key pore residue for high-affinity VU590 block of Kir1.1. For Kir7.1, threonine 153 (T153) creates a polarity barrier that restricts low-affinity ligand access to the pore binding site at E149 and A150.","method":"Molecular modeling, site-directed mutagenesis, patch-clamp electrophysiology","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with electrophysiology and molecular modeling, identifies specific pore residues, single lab","pmids":["28619748"],"is_preprint":false},{"year":2018,"finding":"KCNJ13 is essential for smooth muscle (SM) cell alignment and polarity during mouse tracheal tubulogenesis; loss of KCNJ13 disrupts ion homeostasis in tracheal SM cells, impairing actin polymerization via reduced AKT phosphorylation. Pharmacological increase of AKT phosphorylation ameliorates the tracheal phenotypes.","method":"ENU forward genetic screen, Kcnj13 mutant mouse, SM cell imaging, actin staining, AKT pharmacological rescue","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic model, pharmacological pathway rescue, defined cellular phenotype with molecular mechanism (ion homeostasis → AKT → actin)","pmids":["30022023"],"is_preprint":false},{"year":2018,"finding":"Multiple GPCRs reduce complex glycosylation of Kir7.1, decreasing channel activity without altering its surface expression. Mutagenesis of the sole Kir7.1 glycosylation site reduces conductance and open probability. MC4R is uniquely the only GPCR tested that does not suppress Kir7.1 glycosylation. The LCA-associated L241P mutation has significantly reduced complex glycosylation.","method":"Western blotting, mutagenesis, single-channel recording, HEK293T cell expression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis of glycosylation site validated by single-channel recording, multiple GPCR comparisons, single lab with orthogonal methods","pmids":["30257863"],"is_preprint":false},{"year":2018,"finding":"Conditional deletion of Kcnj13 specifically from RPE cells (Best1-cre) causes severe progressive photoreceptor degeneration (outer nuclear layer thinning) and reduced light response, confirming that Kir7.1 expression in RPE is required for photoreceptor survival.","method":"CRISPR-generated conditional knockout allele, Best1-cre RPE-specific deletion, histology, OCT, ERG","journal":"Experimental eye research","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific conditional knockout with multiple functional and structural readouts, replicates and extends mosaic study","pmids":["30009826"],"is_preprint":false},{"year":2019,"finding":"Deletion of Kcnj13 specifically from MC4R-expressing neurons causes resistance to melanocortin peptide-induced depolarization in PVN brain slices, resistance to the sustained anorexic effect of melanocortin peptides, late-onset obesity, increased linear growth, and glucose intolerance, establishing Kir7.1 as a downstream effector of MC4R signaling in vivo.","method":"MC4R-Cre conditional Kcnj13 knockout mouse, hypothalamic slice patch-clamp, pharmacological melanocortin challenge, metabolic phenotyping","journal":"Journal of neuroendocrinology","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KO with electrophysiological and metabolic phenotype, multiple endpoints, in vivo validation of MC4R-Kir7.1 signaling axis","pmids":["30561082"],"is_preprint":false},{"year":2019,"finding":"In kcnj13 mutant zebrafish (obelixtd15), RPE shows reduced phagosome clearance and increased mitochondrial number and size prior to retinal degeneration, with reduced ATP levels; this suggests that KCNJ13 loss primarily disrupts phagosome physiology with secondary mitochondrial dysfunction.","method":"Electron microscopy, ATP assay, quantitative RT-PCR, mitochondrial marker analysis in zebrafish mutant RPE","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electron microscopy with biochemical validation in genetic model, single lab","pmids":["30846767"],"is_preprint":false},{"year":2020,"finding":"KCNJ13 knockout in human iPSC-derived RPE impairs cell alignment and phagocytosis of photoreceptor outer segments, with reduced expression of phagocytosis-related genes, establishing Kir7.1 as required for RPE phagocytic function.","method":"CRISPR/Cas9 KCNJ13 knockout in hiPSCs, hiPSC-RPE differentiation, phagocytosis assay with fluorescent POS, qPCR","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout in human cell model with functional phagocytosis assay, single lab","pmids":["32437550"],"is_preprint":false},{"year":2020,"finding":"Kir7.1 channels carry a significant proportion of the whole-cell K+ conductance in oligodendrocytes isolated from mouse optic nerves. Pharmacological blockade of Kir7.1 with VU590 compromises oligodendrocyte cell integrity and exacerbates oligodendroglial loss in an oxygen-glucose deprivation model.","method":"Patch-clamp electrophysiology of isolated oligodendrocytes, VU590 pharmacological block, OGD ischemia model in isolated optic nerves, immunofluorescence","journal":"Brain structure & function","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patch-clamp with pharmacological block and functional outcome in ex vivo model, single lab","pmids":["32086565"],"is_preprint":false},{"year":2020,"finding":"The R162W SVD mutation suppresses Kir7.1 through a dominant-negative mechanism dependent on the large, neutral side chain of Trp, which disrupts PIP2 binding at R162 (and K164/K159). Smaller neutral substitutions at R162 are tolerated or enhance function, confirming R162 as part of the PI(4,5)P2 binding site essential for channel gating.","method":"Xenopus oocyte expression, mutagenesis, chemical modification of Cys substitution, DrVSP voltage-dependent phosphatase PIP2 depletion, concatemeric channel constructs","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple mutagenesis strategies with chemical modification and PIP2 manipulation, concatemer approach, multiple orthogonal methods in single study","pmids":["33219695"],"is_preprint":false},{"year":2021,"finding":"Progesterone directly activates Kir7.1 channels in choroid plexus epithelial cells and RPE cells, causing membrane hyperpolarization, independently of classical progesterone receptors expressed in these tissues.","method":"Whole-cell patch-clamp of murine choroid plexus and RPE cells, current-clamp, recombinant Kir7.1 expression, pharmacological receptor antagonists","journal":"The Journal of general physiology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct patch-clamp in native cells and recombinant system, receptor-independence demonstrated pharmacologically, single lab with orthogonal approaches","pmids":["34387656"],"is_preprint":false},{"year":2022,"finding":"SUMOylation of Kir7.1 by SUMO-1 (not SUMO-2/3) in spinal cord neurons decreases Kir7.1 membrane expression and contributes to neuropathic pain after spared nerve injury; inhibition of SUMOylation rescues surface Kir7.1 and reduces mechanical allodynia.","method":"Co-immunoprecipitation, Western blot (total and membrane fractions), shRNA knockdown, pharmacological inhibitors of SUMOylation (E1 inhibitor GA, UBC9 inhibitor 2-D08), von Frey test","journal":"CNS neuroscience & therapeutics","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP identification of SUMO modification, surface fractionation, functional behavioral readout, single lab","pmids":["35633059"],"is_preprint":false},{"year":2022,"finding":"The T153I disease mutation in Kir7.1 produces a full-length protein that reaches the cell membrane but exhibits negligible K+ conductance, failing to hyperpolarize the membrane. Side-chain polarity and length at position 153 (within the inner pore) govern K+ permeation: polar residues with pore radii comparable to WT (Cys, Ser) maintain conductance, while nonpolar substitutions (Ile, Leu, Ala, Gly) do not.","method":"Whole-cell patch-clamp, chord conductance analysis, site-directed mutagenesis, subcellular localization imaging","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — systematic mutagenesis with electrophysiology identifying pore residue determinants of conductance, single lab, multiple mutant series","pmids":["35584325"],"is_preprint":false},{"year":2022,"finding":"Conditional knockout of Kcnj13 in RPE (VMD2-Cre) results in loss of outer nuclear layer photoreceptors, thinning of inner nuclear layer, and loss of bipolar cells with extinguished ERG, while RPE is preserved but morphologically disrupted. Lentiviral replacement of Kcnj13 restored ERG c-wave but not a- or b-waves.","method":"Conditional knockout mouse (gene-trap + Cre), fundoscopy, OCT, ERG, histology, lentiviral gene replacement","journal":"Frontiers in cell and developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with gene replacement (lentiviral rescue), multiple structural and functional endpoints, replicated loss-of-function phenotype","pmids":["35096838"],"is_preprint":false},{"year":2023,"finding":"Base editing delivery to RPE via silica nanocapsules corrected the KCNJ13 W53X mutation in patient fibroblasts (47%) and hiPSC-RPE (17%), restoring functional Kir7.1 channels in edited LCA16-iPSC-RPE. In vivo delivery in an LCA16 mouse model preserved normal vision by ERG and OCT.","method":"Adenine base editor (ABE8e) delivery, patch-clamp of edited hiPSC-RPE, full-field ERG, multifocal ERG, OCT","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — functional channel rescue confirmed by patch-clamp, in vivo ERG and OCT endpoints, human cell and mouse model","pmids":["37561581"],"is_preprint":false},{"year":2024,"finding":"Clozapine inhibits MC4R-expressing PVN neurons by enhancing MC4R–Kir7.1 coupling, opening the channel independently of canonical Gαs signaling; neither clozapine nor risperidone affects MC4R ligand binding or Gαs signaling. Deletion of Kir7.1 in Mc4r-Cre neurons prevents clozapine-induced weight gain.","method":"MC4R-Cre conditional Kcnj13 knockout, hypothalamic slice electrophysiology, radioligand binding, cAMP assay, metabolic phenotyping, Kir7.1 blocker pharmacology","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with electrophysiological and metabolic phenotypes, preprint, multiple orthogonal methods","pmids":["38895206"],"is_preprint":true},{"year":2024,"finding":"The first cryo-EM/structural characterization of human Kir7.1 revealed conformational changes associated with pathogenic mutations R162Q and E276A that illuminate the gating pathway. ML418 blockade was structurally resolved within the pore. Preliminary structural data on an MC4R–Kir7.1 tandem fusion suggest the complex forms a homotetrameric channel that retains MC4R ligand regulation. Channel block in vivo with ML418 activates PVN MC4R neurons, inhibiting food intake and inducing weight loss.","method":"Cryo-EM structure determination, mutagenesis, pharmacological in vivo blockade, patch-clamp","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — cryo-EM structure with mutagenesis validation and in vivo pharmacology; preprint, not yet peer-reviewed","pmids":["38895219"],"is_preprint":true},{"year":2024,"finding":"The I120T mutation in Kir7.1 produces a full-length but completely inactive channel that reaches the plasma membrane; in heterozygous WT/I120T mice, RPE Kir7.1 current is reduced ~50% proportional to WT gene dosage with no dominant-negative effect, and vision is normal. Mutant I120T channels do not form heterotetramers with WT in vitro.","method":"CRISPR knockin mice, RPE patch-clamp with Rb+ charge carrier, mixed transfection and tandem tetrameric constructs, ERG, behavioral vision testing","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro mutagenesis with heterotetrameric concatemer analysis corroborated by in vivo knockin mouse electrophysiology and behavior, multiple orthogonal methods","pmids":["38406825"],"is_preprint":false},{"year":2025,"finding":"Progesterone and synthetic progestins (17α-hydroxyprogesterone caproate, dydrogesterone) directly activate Kir7.1 in myometrial and placental pericyte cells through a nongenomic mechanism, hyperpolarizing these cells and maintaining uterine quiescence during gestation.","method":"Patch-clamp electrophysiology of human and murine myometrium and placental pericytes, pharmacological progestin panel, subcellular localization","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct patch-clamp in native human and mouse cells with panel of steroids, nongenomic mechanism established, replicates and extends prior progesterone-Kir7.1 finding","pmids":["40043131"],"is_preprint":false},{"year":2025,"finding":"Kir7.1 is the primary K+-independent conductance in choroid plexus epithelial (CPE) cells and is critical for setting CSF K+ concentration: conditional knockout reduces [K+]CSF while M125R knock-in (converting K+-independence to K+-dependence) increases it. Kir7.1 loss also strongly inhibits NKCC1 activity in CPE despite unchanged expression, suggesting Kir7.1 functions as part of an apical complex with Na+-K+-ATPase and NKCC1.","method":"Conditional KO and M125R knockin mice, patch-clamp of CPE cells, in vivo CSF collection and K+ measurement, NKCC1 activity assay, Western blot for NKCC1 phosphorylation","journal":"Acta physiologica","confidence":"High","confidence_rationale":"Tier 2 / Strong — bidirectional genetic manipulation (KO and gain-of-function knockin) with in vivo CSF measurements and biochemical NKCC1 analysis, multiple orthogonal methods","pmids":["41212743"],"is_preprint":false},{"year":2025,"finding":"Kir7.1-M125R mice, in which the channel loses its inverse K+-dependence, show altered RPE cell membrane potential relative to controls but normal photoreceptor and bipolar cell ERG responses (normal a- and b-waves), indicating that altered subretinal K+ buffering alone does not impair light signal processing; other Kir7.1 functions (such as photoreceptor outer segment recycling) are implicated in disease pathogenesis.","method":"Kir7.1-M125R knockin mouse, RPE patch-clamp, full-field ERG","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockin with patch-clamp and ERG, single lab, informative negative finding","pmids":["41247777"],"is_preprint":false},{"year":2025,"finding":"OPN3 (opsin 3) in PVN hypothalamic neurons coexpressed with MC4R potentiates Kir7.1 channel activity via Gαi/o signaling under baseline conditions, opposing MC4R-mediated channel closure, and thereby promotes food intake.","method":"Patch-clamp electrophysiology, Gαi/o pharmacological inhibition, Opn3 conditional knockout in Mc4r neurons, cAMP assay, feeding behavior","journal":"Proceedings of the National Academy of Sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology with pharmacological pathway dissection and conditional KO, single lab, extends MC4R-Kir7.1 signaling axis","pmids":["39951488"],"is_preprint":false},{"year":2025,"finding":"Kir7.1 maintains resting membrane potential in neutrophils and is required for directional sensing (but not cell polarization) during chemotaxis. Oscillating membrane potential depolarizations occur in pseudopods toward chemokine sources, and Kir7.1 is required for this polarized depolarization. Focal depolarization biases pseudopod selection and Kir7.1 regulates GPCR signaling activation.","method":"Pharmacological and genetic Kir7.1 inhibition in neutrophils, genetically encoded voltage indicators in zebrafish neutrophils, optogenetic focal depolarization, chemotaxis assays","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacological loss-of-function with live imaging and optogenetics, preprint not peer-reviewed","pmids":["bio_10.1101_2025.03.06.641746"],"is_preprint":true},{"year":2025,"finding":"Anticodon-engineered tRNA (ACE-tRNA) targeting the W53X premature stop codon in KCNJ13 restores full-length Kir7.1 protein and channel function in patient hiPSC-RPE cells, and HDAd delivery in a W53X LCA16 mouse model durably restores vision as measured by retinography.","method":"ACE-tRNA suppression, HDAd viral delivery, patch-clamp of hiPSC-RPE, retinography in mouse model","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — channel function rescue confirmed by patch-clamp, in vivo retinography, preprint not yet peer-reviewed","pmids":["bio_10.1101_2025.07.10.660754"],"is_preprint":true}],"current_model":"KCNJ13/Kir7.1 is an inwardly rectifying K+ channel with unusually low single-channel conductance (~2 pS), mild rectification, inverse dependence on extracellular K+, and selectivity for K+ and Rb+, that localizes to apical membranes of RPE, choroid plexus, and other epithelia where it co-localizes with Na+,K+-ATPase to recycle K+ and maintain ion homeostasis; its gating is controlled by PIP2 binding at R162/K164, intracellular pH via H26, PKA (Ser287) and PKC (Ser201) phosphorylation, glycosylation at its sole N-glycosylation site, and SUMO-1 modification; in RPE it is essential for photoreceptor survival by maintaining subretinal K+ homeostasis and supporting phagocytosis, and mutations cause LCA16 (recessive loss-of-function) or snowflake vitreoretinal degeneration (dominant-negative R162W); in hypothalamic MC4R neurons it mediates G-protein-independent melanocortin regulation of energy homeostasis by coupling receptor activation to channel opening or closing; in uterine myometrium it is directly activated by progesterone to maintain gestational quiescence; and in the choroid plexus it sets CSF K+ concentration and is functionally coupled to NKCC1."},"narrative":{"mechanistic_narrative":"KCNJ13 encodes Kir7.1, an inwardly rectifying K+ channel with a distinctive low (~2 pS) unitary conductance, mild rectification, an inverse dependence on extracellular K+, and a K+≈Rb+>>Cs+>Na+ selectivity that constitutes the apical K+ conductance of polarized epithelia [PMID:11230507, PMID:11179389]. Across tissues it localizes to membrane domains adjacent to Na+,K+-ATPase, consistent with a role in recycling K+ to sustain pump-driven transport [PMID:10455019, PMID:11179389]. Channel gating is governed by PIP2 binding at R162 (with K159/K164), by intracellular pH via the N-terminal H26, and by dual phosphorylation (PKC-inhibitory Ser201, PKA-stimulatory Ser287); complex glycosylation at its sole N-glycosylation site sets conductance and open probability, and SUMO-1 modification controls surface expression [PMID:33219695, PMID:18094146, PMID:18976636, PMID:30257863, PMID:35633059]. C-terminal length is required for plasma-membrane targeting [PMID:16406822], and conserved inner-pore residues (T153, M125) determine both K+ permeation and inhibitor access [PMID:35584325, PMID:28619748, PMID:41212743]. In the retinal pigment epithelium Kir7.1 maintains subretinal K+ homeostasis and supports phagocytosis of photoreceptor outer segments, and its loss causes photoreceptor degeneration; this RPE requirement is cell-autonomous as shown by mosaic and tissue-specific deletion [PMID:25666713, PMID:30009826, PMID:32437550, PMID:28878288]. Human mutations cause inherited blindness: recessive loss-of-function alleles (e.g. W53X, T153I, L241P) underlie Leber congenital amaurosis type 16, while the dominant R162W allele converts the channel to a nonselective cation conductance and acts dominant-negatively by disrupting PIP2 gating in snowflake vitreoretinal degeneration [PMID:25921210, PMID:35584325, PMID:18179896, PMID:23255580, PMID:33219695]. Beyond the eye, Kir7.1 acts as a G-protein-independent effector of MC4R signaling in hypothalamic PVN neurons to regulate energy homeostasis [PMID:25600267, PMID:30561082], is directly activated by progesterone through a nongenomic mechanism to maintain uterine quiescence [PMID:25056913, PMID:34387656, PMID:40043131], and sets cerebrospinal fluid K+ in choroid plexus where it is functionally coupled to NKCC1 and Na+,K+-ATPase [PMID:41212743]. Gene-correction strategies including base editing and tRNA suppression restore channel function and vision in LCA16 models [PMID:37561581, PMID:bio_10.1101_2025.07.10.660754].","teleology":[{"year":1999,"claim":"Established where Kir7.1 protein resides in epithelia, linking it to transepithelial ion transport machinery rather than a defined function.","evidence":"Immunohistochemistry and fractionation in thyroid and choroid plexus epithelia","pmids":["10455019"],"confidence":"Medium","gaps":["No functional reconstitution of channel activity","Co-localization does not prove physical or functional coupling to Na+,K+-ATPase"]},{"year":2001,"claim":"Defined Kir7.1 as the molecular identity of the RPE apical K+ conductance and characterized its unusual biophysical signature, converting a candidate gene into a functional channel.","evidence":"Two-electrode voltage-clamp in oocytes and patch-clamp of native bovine RPE with noise analysis, plus EM localization and heterologous patch-clamp","pmids":["11230507","11179389"],"confidence":"High","gaps":["Structural basis of low conductance and inverse K+ dependence unresolved","Gating regulators not yet identified"]},{"year":2006,"claim":"Identified C-terminal length as a trafficking determinant and used a zebrafish pigment mutant to show channel activity governs cellular signaling output, broadening Kir7.1 roles beyond epithelial K+ recycling.","evidence":"Deletion mutagenesis with surface biotinylation in MDCK; positional cloning, patch-clamp and BAC rescue in zebrafish jaguar/obelix","pmids":["16406822","17121467"],"confidence":"Medium","gaps":["Trafficking motif within the C-terminus not pinpointed","Mechanism linking channel activity to melanosome dispersion downstream of adrenoceptors unresolved"]},{"year":2008,"claim":"Defined gating regulators (pH via H26, PKC/PKA phosphorylation) and the molecular pathology of the dominant SVD R162W allele, distinguishing it as a gain-of-toxic-function changing ion selectivity.","evidence":"Oocyte voltage-clamp with site-directed mutagenesis; CHO patch-clamp and molecular modeling of R162W","pmids":["18094146","18976636","18179896"],"confidence":"High","gaps":["Physiological kinase signaling inputs in vivo not established","Initial selectivity-change interpretation not yet reconciled with later dominant-negative gating model"]},{"year":2012,"claim":"Resolved the R162W mechanism as a PIP2-gating-disrupting dominant-negative that still traffics to the membrane, clarifying why SVD is dominant.","evidence":"Co-injection oocyte voltage-clamp and immunostaining; CHO co-expression and homology modeling","pmids":["23255580","23977131"],"confidence":"High","gaps":["Direct demonstration of PIP2-binding loss awaited","Stoichiometry of mutant/WT subunit mixing not quantified"]},{"year":2014,"claim":"Extended Kir7.1 function to myometrial physiology, showing it sets membrane potential to enforce gestational quiescence.","evidence":"Bidirectional lentiviral knockdown/overexpression, contractility assays, VU590 pharmacology and patch-clamp","pmids":["25056913"],"confidence":"High","gaps":["Upstream regulator driving labor-associated Kir7.1 downregulation not identified at this stage","Direct activator of the channel in myometrium unknown"]},{"year":2015,"claim":"Demonstrated a novel G-protein-independent signaling role: MC4R directly couples to Kir7.1 in hypothalamic neurons to control energy balance, with α-MSH closing and AgRP opening the channel.","evidence":"Hypothalamic slice patch-clamp in mice with Gαs pathway dissection and ligand-binding studies","pmids":["25600267"],"confidence":"High","gaps":["Physical nature of the MC4R–Kir7.1 coupling not structurally defined","How a single channel produces opposite responses to two ligands unresolved"]},{"year":2015,"claim":"Established in vivo that RPE Kir7.1 is required cell-autonomously for photoreceptor survival and explained recessive LCA16 inheritance, distinguishing it from dominant SVD.","evidence":"CRISPR mosaic deletion, Kcnj13 knockout, shRNA knockdown with ERG; heterologous expression of LCA nonsense mutant showing no dominant-negative effect","pmids":["25666713","26402555","25921210"],"confidence":"High","gaps":["Complete-knockout postnatal lethality precluded adult retinal analysis","Whether degeneration reflects K+ buffering versus other RPE functions unresolved"]},{"year":2017,"claim":"Tied RPE Kir7.1 function to whole-retina electrophysiology via subretinal K+ control and mapped the VU590 inhibitor binding mechanism within the pore.","evidence":"In vivo shRNA/VU590 with ERG and isolated-retina controls; native RPE patch-clamp; mutagenesis and modeling of pore residues; OXTR modulation experiments","pmids":["28878288","28619748","28603013"],"confidence":"High","gaps":["Whether ERG deficits arise solely from altered subretinal K+ unresolved","Physiological role of oxytocin modulation of RPE Kir7.1 unknown"]},{"year":2018,"claim":"Revealed glycosylation as a GPCR-tunable modulator of channel activity and uncovered developmental roles in palatogenesis and tracheal smooth-muscle morphogenesis linking ion homeostasis to AKT-dependent actin polymerization.","evidence":"Glycosylation-site mutagenesis with single-channel recording across GPCRs; conditional RPE knockout with ERG/OCT; ENU mutant mouse with AKT pharmacological rescue","pmids":["30257863","30009826","30022023"],"confidence":"High","gaps":["Signaling chain from channel activity to AKT phosphorylation not fully defined","How GPCRs reduce glycosylation mechanistically unresolved"]},{"year":2019,"claim":"Confirmed in vivo that Kir7.1 is the downstream effector of MC4R for energy homeostasis and dissected RPE phagosome/mitochondrial pathology preceding degeneration.","evidence":"MC4R-Cre conditional Kcnj13 knockout with slice electrophysiology and metabolic phenotyping; zebrafish mutant EM, ATP and mitochondrial analysis","pmids":["30561082","30846767"],"confidence":"High","gaps":["Whether phagosome defect is primary or secondary to ion imbalance unresolved","Molecular link between channel activity and phagocytic gene expression unknown"]},{"year":2020,"claim":"Demonstrated a direct requirement for Kir7.1 in human RPE phagocytosis and identified additional roles in oligodendrocyte integrity under ischemic stress.","evidence":"CRISPR knockout in hiPSC-RPE with phagocytosis assays and qPCR; oligodendrocyte patch-clamp with VU590 in an OGD model","pmids":["32437550","32086565"],"confidence":"Medium","gaps":["Mechanism coupling K+ conductance to phagocytic machinery undefined","Oligodendrocyte phenotype rests on pharmacology without genetic confirmation"]},{"year":2021,"claim":"Identified progesterone as a direct, receptor-independent activator of Kir7.1, providing a molecular basis for hormonal control of channel-dependent tissues.","evidence":"Patch-clamp of native choroid plexus and RPE cells and recombinant channel with receptor antagonists","pmids":["34387656"],"confidence":"High","gaps":["Direct binding site for progesterone on the channel not localized","Physiological consequences in choroid plexus and RPE not tested"]},{"year":2022,"claim":"Defined pore residue determinants of conductance through disease mutations and identified SUMOylation as a surface-expression regulator relevant to neuropathic pain.","evidence":"Systematic mutagenesis of T153 with patch-clamp; Co-IP, surface fractionation, SUMOylation inhibitors and von Frey behavior; conditional RPE knockout with lentiviral rescue","pmids":["35584325","35633059","35096838"],"confidence":"High","gaps":["SUMO-1 acceptor lysine on Kir7.1 not mapped","Lentiviral rescue restored only the c-wave, leaving photoreceptor-level rescue unachieved"]},{"year":2023,"claim":"Showed that gene correction restores Kir7.1 function and vision, establishing therapeutic tractability of LCA16.","evidence":"Adenine base editing of W53X in patient fibroblasts and hiPSC-RPE with patch-clamp, and in vivo ERG/OCT in an LCA16 mouse","pmids":["37561581"],"confidence":"High","gaps":["Editing efficiency in RPE remained partial","Durability and off-target profile not fully resolved"]},{"year":2024,"claim":"Provided the first structural views of human Kir7.1 gating and the MC4R–Kir7.1 complex, and showed the channel is a clinically relevant target for antipsychotic-associated weight effects.","evidence":"Cryo-EM with mutagenesis and ML418 pharmacology (preprint); MC4R-Cre conditional knockout with electrophysiology, binding/cAMP assays and metabolic phenotyping (preprint)","pmids":["38895219","38895206"],"confidence":"Medium","gaps":["Structural data are preprint and not peer-reviewed","Assembly stoichiometry of the MC4R–Kir7.1 complex only preliminary"]},{"year":2025,"claim":"Distinguished Kir7.1 functions in disease by separating K+-buffering from other roles, extended its physiology to CSF homeostasis, neutrophil chemotaxis and OPN3 modulation, and broadened progesterone activation across reproductive tissues.","evidence":"M125R and conditional knockin/knockout mice with CSF K+ and NKCC1 assays, RPE patch-clamp/ERG; native myometrium and pericyte patch-clamp with progestin panel; OPN3 conditional KO with electrophysiology; voltage-imaging/optogenetics in neutrophils (preprint); ACE-tRNA rescue (preprint)","pmids":["41212743","41247777","40043131","39951488","41212743"],"confidence":"High","gaps":["The non-K+-buffering RPE function driving degeneration remains unidentified","Mechanism of Kir7.1–NKCC1 coupling not biochemically resolved","Neutrophil and tRNA-rescue findings remain preprint"]},{"year":null,"claim":"How Kir7.1 physically couples to MC4R and to NKCC1/Na+,K+-ATPase, and which RPE function beyond subretinal K+ buffering drives photoreceptor degeneration, remain the central open mechanistic questions.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No peer-reviewed structure of the MC4R–Kir7.1 complex","Direct progesterone-binding site on the channel unmapped","The disease-relevant non-K+-buffering RPE role unidentified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[1,2,30,37]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[13,23]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,2,3,6,35]}],"pathway":[{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[1,37]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[13,23,39]},{"term_id":"R-HSA-9709957","term_label":"Sensory Perception","supporting_discovery_ids":[14,17,22]}],"complexes":[],"partners":["MC4R","NKCC1","OPN3","OXTR"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O60928","full_name":"Inward rectifier potassium channel 13","aliases":["Inward rectifier K(+) channel Kir7.1","Potassium channel, inwardly rectifying subfamily J member 13"],"length_aa":360,"mass_kda":40.5,"function":"Inward rectifier potassium channels are characterized by a greater tendency to allow potassium to flow into the cell rather than out of it. Their voltage dependence is regulated by the concentration of extracellular potassium; as external potassium is raised, the voltage range of the channel opening shifts to more positive voltages. The inward rectification is mainly due to the blockage of outward current by internal magnesium. KCNJ13 has a very low single channel conductance, low sensitivity to block by external barium and cesium, and no dependence of its inward rectification properties on the internal blocking particle magnesium","subcellular_location":"Membrane; Cell membrane","url":"https://www.uniprot.org/uniprotkb/O60928/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KCNJ13","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/KCNJ13","total_profiled":1310},"omim":[{"mim_id":"614186","title":"LEBER CONGENITAL AMAUROSIS 16; LCA16","url":"https://www.omim.org/entry/614186"},{"mim_id":"603208","title":"POTASSIUM CHANNEL, INWARDLY RECTIFYING, SUBFAMILY J, MEMBER 13; KCNJ13","url":"https://www.omim.org/entry/603208"},{"mim_id":"204000","title":"LEBER CONGENITAL AMAUROSIS 1; LCA1","url":"https://www.omim.org/entry/204000"},{"mim_id":"193230","title":"VITREORETINAL DEGENERATION, SNOWFLAKE TYPE; SVD","url":"https://www.omim.org/entry/193230"},{"mim_id":"155541","title":"MELANOCORTIN 4 RECEPTOR; MC4R","url":"https://www.omim.org/entry/155541"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear membrane","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"choroid plexus","ntpm":165.9},{"tissue":"intestine","ntpm":85.9}],"url":"https://www.proteinatlas.org/search/KCNJ13"},"hgnc":{"alias_symbol":["Kir7.1","Kir1.4","LCA16"],"prev_symbol":[]},"alphafold":{"accession":"O60928","domains":[{"cath_id":"1.10.287.70","chopping":"49-162","consensus_level":"high","plddt":94.2252,"start":49,"end":162},{"cath_id":"2.60.40.1400","chopping":"166-327","consensus_level":"high","plddt":90.1993,"start":166,"end":327}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O60928","model_url":"https://alphafold.ebi.ac.uk/files/AF-O60928-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O60928-F1-predicted_aligned_error_v6.png","plddt_mean":83.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KCNJ13","jax_strain_url":"https://www.jax.org/strain/search?query=KCNJ13"},"sequence":{"accession":"O60928","fasta_url":"https://rest.uniprot.org/uniprotkb/O60928.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O60928/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O60928"}},"corpus_meta":[{"pmid":"25600267","id":"PMC_25600267","title":"G-protein-independent 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The selectivity sequence is K+ ≈ Rb+ >> Cs+ > Na+ ≈ Li+.\",\n      \"method\": \"Xenopus oocyte two-electrode voltage-clamp, whole-cell patch-clamp on bovine RPE, non-stationary noise analysis, Northern/Western blot\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro electrophysiology with reconstitution in oocytes corroborated by native RPE recordings, replicated across two independent preparations\",\n      \"pmids\": [\"11230507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Kir7.1 is localized specifically at the proximal roots of apical processes of RPE cells, co-localizing with Na+,K+-ATPase, and its currents recapitulate the IK(IR) recorded from isolated RPE cells (poor K+-dependence, low Ba2+ sensitivity).\",\n      \"method\": \"Immunohistochemistry including electron microscopy, RT-PCR, immunoblot, patch-clamp in HEK293T cells\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — subcellular localization by electron microscopy confirmed with electrophysiological validation in heterologous system, replicated findings from co-published RPE study\",\n      \"pmids\": [\"11179389\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Kir7.1 is localized to the basolateral membrane of distal nephron principal cells (DCT, connecting tubule, cortical collecting duct) co-localizing with Na+,K+-ATPase, where it may function in K+ recycling to sustain pump activity.\",\n      \"method\": \"Western blot, immunohistochemistry, electron microscopic immunocytochemistry, double-labeling immunogold\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electron microscopic immunocytochemistry with double-labeling immunogold, single lab, no direct functional reconstitution\",\n      \"pmids\": [\"11053473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Kir7.1 constitutes a major component of the apical K+ conductance in bovine RPE, distributed over the length of apical processes, and distinct from Kir4.1, which is absent from RPE.\",\n      \"method\": \"RT-PCR, Northern blot, Western blot, indirect immunofluorescence\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (RT-PCR, Western, immunofluorescence), single lab\",\n      \"pmids\": [\"12824269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Mutations in Kir7.1 in zebrafish jaguar/obelix mutants alter K+ channel activity (demonstrated by patch-clamp), impair the melanophore response to sympathetic neuron-derived melanosome dispersion signals, and constitutively activate melanosome aggregation downstream of the alpha2-adrenoceptor pathway.\",\n      \"method\": \"Positional cloning, patch-clamp electrophysiology, BAC rescue experiment, pigment pattern analysis\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — patch-clamp validation of channel activity, genetic rescue by BAC, epistasis with adrenergic signaling pathway\",\n      \"pmids\": [\"17121467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The C-terminal length of Kir7.1 is critical for plasma membrane targeting; deletion of 38 or more C-terminal residues causes intracellular retention, an effect rescued by addition of alanine residues to restore C-terminal length.\",\n      \"method\": \"Deletion mutagenesis, immunofluorescence microscopy, cell-surface biotinylation in MDCK cells\",\n      \"journal\": \"Cell biology international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis combined with surface biotinylation, single lab, two complementary methods\",\n      \"pmids\": [\"16406822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Kir7.1 channels are modulated by intracellular pH in a biphasic manner (maximal activity near pH 7.0, inhibited by acidification or alkalinization), and by extracellular acidification. Histidine 26 (H26) in the NH2-terminus is important for channel activation at physiological pHi.\",\n      \"method\": \"Xenopus oocyte two-electrode voltage-clamp, site-directed mutagenesis of histidine residues\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro electrophysiology with mutagenesis identifying specific residue, single lab\",\n      \"pmids\": [\"18094146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The R162W mutation in KCNJ13 (SVD-associated) causes Kir7.1 to produce a nonselective cation current instead of selective K+ current, depolarizing transfected cells and increasing cell fragility, establishing a gain-of-toxic-function mechanism for dominant SVD.\",\n      \"method\": \"Overexpression in CHO-K1 cells, whole-cell patch-clamp, molecular modeling\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — patch-clamp electrophysiology plus structural modeling in heterologous cells, single lab with multiple methods\",\n      \"pmids\": [\"18179896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Kir7.1 channel activity is dually regulated by PKC (inhibition via Ser201) and PKA (stimulation via Ser287) in the C-terminal domain.\",\n      \"method\": \"Xenopus oocyte expression, pharmacological PKC/PKA activation/inhibition, site-directed mutagenesis of consensus phosphorylation sites\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro mutagenesis and electrophysiology, single lab, identifies specific residues\",\n      \"pmids\": [\"18976636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The R162W mutation causes dominant-negative suppression of Kir7.1: co-expression of mutant and WT Kir7.1 cRNA reduces K+ and Rb+ currents to ~17% of WT alone, while the mutant protein still reaches the plasma membrane. The dominant-negative effect may occur by disruption of PIP2 gating.\",\n      \"method\": \"Xenopus oocyte two-electrode voltage-clamp, immunostaining of oocytes and MDCK cells\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — quantitative electrophysiology with co-injection paradigm, membrane localization confirmed, single lab\",\n      \"pmids\": [\"23255580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The SVD R162W mutation produces a non-functional Kir channel that depolarizes resting membrane potential upon expression in CHO cells, and co-expression with WT Kir7.1 shows dominant-negative reduction of IKir7.1. Homology modeling suggests loss of hydrogen bonding in the lipid-binding (PIP2) regulatory domain of the cytoplasmic structure.\",\n      \"method\": \"CHO cell expression, whole-cell patch-clamp, co-expression experiments, homology modeling based on bacterial Kir structure\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — patch-clamp with co-expression, homology modeling; single lab, corroborates concurrent Xenopus oocyte study\",\n      \"pmids\": [\"23977131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Kir7.1 current hyperpolarizes uterine myocytes and promotes myometrial quiescence during gestation. Labor is associated with decreased Kir7.1 expression. Lentiviral miRNA-mediated knockdown of Kir7.1 increased uterine contractile force and duration, while overexpression inhibited contractility. The Kir7.1 inhibitor VU590 induced prolonged uterine contractions.\",\n      \"method\": \"Genome-wide screen, computational modeling, lentiviral miRNA knockdown and overexpression, uterine contractility assays, patch-clamp\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — bidirectional functional manipulation (knockdown and overexpression) with defined contractility phenotype, pharmacological validation with VU590, multiple orthogonal methods\",\n      \"pmids\": [\"25056913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MC4R couples to Kir7.1 in hypothalamic PVN neurons in a G-protein (Gαs)-independent manner: α-MSH closes Kir7.1 (depolarizing neurons) and AgRP acts as a biased agonist opening Kir7.1 (hyperpolarizing neurons), independently of blocking α-MSH binding. This Kir7.1 signaling pathway contributes to melanocortin-mediated regulation of energy homeostasis.\",\n      \"method\": \"Hypothalamic slice patch-clamp electrophysiology in mice, pharmacological dissection of Gαs pathway, ligand-binding studies\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — electrophysiology in native neurons with pharmacological Gαs-independence demonstrated, multiple ligands tested, published in high-impact journal\",\n      \"pmids\": [\"25600267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CRISPR-Cas9 mosaic deletion of Kcnj13 in mouse RPE causes photoreceptor degeneration overlying mutant RPE cells, while wild-type RPE cells can rescue photoreceptors overlying mutant RPE; complete loss of Kcnj13 is likely postnatal lethal. This establishes KCNJ13 expression in RPE as required for photoreceptor survival.\",\n      \"method\": \"CRISPR-Cas9 zygote injection, mosaic analysis, immunofluorescence, electroretinography\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic loss-of-function with defined cell-autonomous vs non-autonomous rescue, ERG functional readout\",\n      \"pmids\": [\"25666713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A novel nonsense mutation in KCNJ13 (LCA16) truncates the Kir7.1 C-terminus, alters protein localization, and disrupts potassium currents. Heterozygous co-expression of mutant and WT channel has no negative influence on WT channel function (no dominant-negative effect), consistent with recessive inheritance. shRNA suppression of Kir7.1 in mice reproduces the LCA ERG phenotype.\",\n      \"method\": \"Heterologous expression, patch-clamp electrophysiology, subcellular localization, mouse shRNA knockdown, ERG\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — electrophysiology, localization, and in vivo ERG phenotype, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"25921210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Homozygous Kcnj13 knockout mice die hours after birth and exhibit cleft palate and moderate lung developmental retardation, establishing Kir7.1 roles in palatogenesis and respiratory development.\",\n      \"method\": \"Kcnj13 gene ablation (knockout mouse), histology, developmental analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with defined morphological phenotype, single lab\",\n      \"pmids\": [\"26402555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Kir7.1 in RPE is required for normal a-, b-, and c-wave ERG responses: shRNA knockdown or pharmacological block with VU590 in vivo reduces all ERG wave amplitudes, whereas VU590 has no effect on isolated retina (without attached RPE), indicating that RPE Kir7.1 controls subretinal K+ homeostasis that is required for photoreceptor and bipolar cell electrophysiology.\",\n      \"method\": \"In vivo shRNA knockdown, pharmacological block (VU590), ERG, ex vivo isolated retina ERG, patch-clamp of native mouse RPE\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic and pharmacological loss-of-function with tissue-specific controls, multiple ERG endpoints, native cell patch-clamp confirmation\",\n      \"pmids\": [\"28878288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Oxytocin receptor (OXTR) activation in RPE inhibits Kir7.1 channel activity through a PIP2-dependent capacitative Ca2+ entry mechanism.\",\n      \"method\": \"Human RPE cell line, HEK293 heterologous OXTR expression, Ca2+ imaging, pharmacological Ca2+ signaling inhibitors, patch-clamp\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional electrophysiology with pharmacological dissection, single lab, two orthogonal approaches\",\n      \"pmids\": [\"28603013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"VU590 inhibits Kir7.1 and Kir1.1 by a voltage- and K+-dependent mechanism within the channel pore. Asparagine 171 (N171) is the key pore residue for high-affinity VU590 block of Kir1.1. For Kir7.1, threonine 153 (T153) creates a polarity barrier that restricts low-affinity ligand access to the pore binding site at E149 and A150.\",\n      \"method\": \"Molecular modeling, site-directed mutagenesis, patch-clamp electrophysiology\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with electrophysiology and molecular modeling, identifies specific pore residues, single lab\",\n      \"pmids\": [\"28619748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"KCNJ13 is essential for smooth muscle (SM) cell alignment and polarity during mouse tracheal tubulogenesis; loss of KCNJ13 disrupts ion homeostasis in tracheal SM cells, impairing actin polymerization via reduced AKT phosphorylation. Pharmacological increase of AKT phosphorylation ameliorates the tracheal phenotypes.\",\n      \"method\": \"ENU forward genetic screen, Kcnj13 mutant mouse, SM cell imaging, actin staining, AKT pharmacological rescue\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic model, pharmacological pathway rescue, defined cellular phenotype with molecular mechanism (ion homeostasis → AKT → actin)\",\n      \"pmids\": [\"30022023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Multiple GPCRs reduce complex glycosylation of Kir7.1, decreasing channel activity without altering its surface expression. Mutagenesis of the sole Kir7.1 glycosylation site reduces conductance and open probability. MC4R is uniquely the only GPCR tested that does not suppress Kir7.1 glycosylation. The LCA-associated L241P mutation has significantly reduced complex glycosylation.\",\n      \"method\": \"Western blotting, mutagenesis, single-channel recording, HEK293T cell expression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of glycosylation site validated by single-channel recording, multiple GPCR comparisons, single lab with orthogonal methods\",\n      \"pmids\": [\"30257863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Conditional deletion of Kcnj13 specifically from RPE cells (Best1-cre) causes severe progressive photoreceptor degeneration (outer nuclear layer thinning) and reduced light response, confirming that Kir7.1 expression in RPE is required for photoreceptor survival.\",\n      \"method\": \"CRISPR-generated conditional knockout allele, Best1-cre RPE-specific deletion, histology, OCT, ERG\",\n      \"journal\": \"Experimental eye research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific conditional knockout with multiple functional and structural readouts, replicates and extends mosaic study\",\n      \"pmids\": [\"30009826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Deletion of Kcnj13 specifically from MC4R-expressing neurons causes resistance to melanocortin peptide-induced depolarization in PVN brain slices, resistance to the sustained anorexic effect of melanocortin peptides, late-onset obesity, increased linear growth, and glucose intolerance, establishing Kir7.1 as a downstream effector of MC4R signaling in vivo.\",\n      \"method\": \"MC4R-Cre conditional Kcnj13 knockout mouse, hypothalamic slice patch-clamp, pharmacological melanocortin challenge, metabolic phenotyping\",\n      \"journal\": \"Journal of neuroendocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KO with electrophysiological and metabolic phenotype, multiple endpoints, in vivo validation of MC4R-Kir7.1 signaling axis\",\n      \"pmids\": [\"30561082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In kcnj13 mutant zebrafish (obelixtd15), RPE shows reduced phagosome clearance and increased mitochondrial number and size prior to retinal degeneration, with reduced ATP levels; this suggests that KCNJ13 loss primarily disrupts phagosome physiology with secondary mitochondrial dysfunction.\",\n      \"method\": \"Electron microscopy, ATP assay, quantitative RT-PCR, mitochondrial marker analysis in zebrafish mutant RPE\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electron microscopy with biochemical validation in genetic model, single lab\",\n      \"pmids\": [\"30846767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"KCNJ13 knockout in human iPSC-derived RPE impairs cell alignment and phagocytosis of photoreceptor outer segments, with reduced expression of phagocytosis-related genes, establishing Kir7.1 as required for RPE phagocytic function.\",\n      \"method\": \"CRISPR/Cas9 KCNJ13 knockout in hiPSCs, hiPSC-RPE differentiation, phagocytosis assay with fluorescent POS, qPCR\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout in human cell model with functional phagocytosis assay, single lab\",\n      \"pmids\": [\"32437550\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Kir7.1 channels carry a significant proportion of the whole-cell K+ conductance in oligodendrocytes isolated from mouse optic nerves. Pharmacological blockade of Kir7.1 with VU590 compromises oligodendrocyte cell integrity and exacerbates oligodendroglial loss in an oxygen-glucose deprivation model.\",\n      \"method\": \"Patch-clamp electrophysiology of isolated oligodendrocytes, VU590 pharmacological block, OGD ischemia model in isolated optic nerves, immunofluorescence\",\n      \"journal\": \"Brain structure & function\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patch-clamp with pharmacological block and functional outcome in ex vivo model, single lab\",\n      \"pmids\": [\"32086565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The R162W SVD mutation suppresses Kir7.1 through a dominant-negative mechanism dependent on the large, neutral side chain of Trp, which disrupts PIP2 binding at R162 (and K164/K159). Smaller neutral substitutions at R162 are tolerated or enhance function, confirming R162 as part of the PI(4,5)P2 binding site essential for channel gating.\",\n      \"method\": \"Xenopus oocyte expression, mutagenesis, chemical modification of Cys substitution, DrVSP voltage-dependent phosphatase PIP2 depletion, concatemeric channel constructs\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple mutagenesis strategies with chemical modification and PIP2 manipulation, concatemer approach, multiple orthogonal methods in single study\",\n      \"pmids\": [\"33219695\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Progesterone directly activates Kir7.1 channels in choroid plexus epithelial cells and RPE cells, causing membrane hyperpolarization, independently of classical progesterone receptors expressed in these tissues.\",\n      \"method\": \"Whole-cell patch-clamp of murine choroid plexus and RPE cells, current-clamp, recombinant Kir7.1 expression, pharmacological receptor antagonists\",\n      \"journal\": \"The Journal of general physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct patch-clamp in native cells and recombinant system, receptor-independence demonstrated pharmacologically, single lab with orthogonal approaches\",\n      \"pmids\": [\"34387656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SUMOylation of Kir7.1 by SUMO-1 (not SUMO-2/3) in spinal cord neurons decreases Kir7.1 membrane expression and contributes to neuropathic pain after spared nerve injury; inhibition of SUMOylation rescues surface Kir7.1 and reduces mechanical allodynia.\",\n      \"method\": \"Co-immunoprecipitation, Western blot (total and membrane fractions), shRNA knockdown, pharmacological inhibitors of SUMOylation (E1 inhibitor GA, UBC9 inhibitor 2-D08), von Frey test\",\n      \"journal\": \"CNS neuroscience & therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP identification of SUMO modification, surface fractionation, functional behavioral readout, single lab\",\n      \"pmids\": [\"35633059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The T153I disease mutation in Kir7.1 produces a full-length protein that reaches the cell membrane but exhibits negligible K+ conductance, failing to hyperpolarize the membrane. Side-chain polarity and length at position 153 (within the inner pore) govern K+ permeation: polar residues with pore radii comparable to WT (Cys, Ser) maintain conductance, while nonpolar substitutions (Ile, Leu, Ala, Gly) do not.\",\n      \"method\": \"Whole-cell patch-clamp, chord conductance analysis, site-directed mutagenesis, subcellular localization imaging\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — systematic mutagenesis with electrophysiology identifying pore residue determinants of conductance, single lab, multiple mutant series\",\n      \"pmids\": [\"35584325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Conditional knockout of Kcnj13 in RPE (VMD2-Cre) results in loss of outer nuclear layer photoreceptors, thinning of inner nuclear layer, and loss of bipolar cells with extinguished ERG, while RPE is preserved but morphologically disrupted. Lentiviral replacement of Kcnj13 restored ERG c-wave but not a- or b-waves.\",\n      \"method\": \"Conditional knockout mouse (gene-trap + Cre), fundoscopy, OCT, ERG, histology, lentiviral gene replacement\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with gene replacement (lentiviral rescue), multiple structural and functional endpoints, replicated loss-of-function phenotype\",\n      \"pmids\": [\"35096838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Base editing delivery to RPE via silica nanocapsules corrected the KCNJ13 W53X mutation in patient fibroblasts (47%) and hiPSC-RPE (17%), restoring functional Kir7.1 channels in edited LCA16-iPSC-RPE. In vivo delivery in an LCA16 mouse model preserved normal vision by ERG and OCT.\",\n      \"method\": \"Adenine base editor (ABE8e) delivery, patch-clamp of edited hiPSC-RPE, full-field ERG, multifocal ERG, OCT\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — functional channel rescue confirmed by patch-clamp, in vivo ERG and OCT endpoints, human cell and mouse model\",\n      \"pmids\": [\"37561581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Clozapine inhibits MC4R-expressing PVN neurons by enhancing MC4R–Kir7.1 coupling, opening the channel independently of canonical Gαs signaling; neither clozapine nor risperidone affects MC4R ligand binding or Gαs signaling. Deletion of Kir7.1 in Mc4r-Cre neurons prevents clozapine-induced weight gain.\",\n      \"method\": \"MC4R-Cre conditional Kcnj13 knockout, hypothalamic slice electrophysiology, radioligand binding, cAMP assay, metabolic phenotyping, Kir7.1 blocker pharmacology\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with electrophysiological and metabolic phenotypes, preprint, multiple orthogonal methods\",\n      \"pmids\": [\"38895206\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The first cryo-EM/structural characterization of human Kir7.1 revealed conformational changes associated with pathogenic mutations R162Q and E276A that illuminate the gating pathway. ML418 blockade was structurally resolved within the pore. Preliminary structural data on an MC4R–Kir7.1 tandem fusion suggest the complex forms a homotetrameric channel that retains MC4R ligand regulation. Channel block in vivo with ML418 activates PVN MC4R neurons, inhibiting food intake and inducing weight loss.\",\n      \"method\": \"Cryo-EM structure determination, mutagenesis, pharmacological in vivo blockade, patch-clamp\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structure with mutagenesis validation and in vivo pharmacology; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"38895219\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The I120T mutation in Kir7.1 produces a full-length but completely inactive channel that reaches the plasma membrane; in heterozygous WT/I120T mice, RPE Kir7.1 current is reduced ~50% proportional to WT gene dosage with no dominant-negative effect, and vision is normal. Mutant I120T channels do not form heterotetramers with WT in vitro.\",\n      \"method\": \"CRISPR knockin mice, RPE patch-clamp with Rb+ charge carrier, mixed transfection and tandem tetrameric constructs, ERG, behavioral vision testing\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro mutagenesis with heterotetrameric concatemer analysis corroborated by in vivo knockin mouse electrophysiology and behavior, multiple orthogonal methods\",\n      \"pmids\": [\"38406825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Progesterone and synthetic progestins (17α-hydroxyprogesterone caproate, dydrogesterone) directly activate Kir7.1 in myometrial and placental pericyte cells through a nongenomic mechanism, hyperpolarizing these cells and maintaining uterine quiescence during gestation.\",\n      \"method\": \"Patch-clamp electrophysiology of human and murine myometrium and placental pericytes, pharmacological progestin panel, subcellular localization\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct patch-clamp in native human and mouse cells with panel of steroids, nongenomic mechanism established, replicates and extends prior progesterone-Kir7.1 finding\",\n      \"pmids\": [\"40043131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Kir7.1 is the primary K+-independent conductance in choroid plexus epithelial (CPE) cells and is critical for setting CSF K+ concentration: conditional knockout reduces [K+]CSF while M125R knock-in (converting K+-independence to K+-dependence) increases it. Kir7.1 loss also strongly inhibits NKCC1 activity in CPE despite unchanged expression, suggesting Kir7.1 functions as part of an apical complex with Na+-K+-ATPase and NKCC1.\",\n      \"method\": \"Conditional KO and M125R knockin mice, patch-clamp of CPE cells, in vivo CSF collection and K+ measurement, NKCC1 activity assay, Western blot for NKCC1 phosphorylation\",\n      \"journal\": \"Acta physiologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — bidirectional genetic manipulation (KO and gain-of-function knockin) with in vivo CSF measurements and biochemical NKCC1 analysis, multiple orthogonal methods\",\n      \"pmids\": [\"41212743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Kir7.1-M125R mice, in which the channel loses its inverse K+-dependence, show altered RPE cell membrane potential relative to controls but normal photoreceptor and bipolar cell ERG responses (normal a- and b-waves), indicating that altered subretinal K+ buffering alone does not impair light signal processing; other Kir7.1 functions (such as photoreceptor outer segment recycling) are implicated in disease pathogenesis.\",\n      \"method\": \"Kir7.1-M125R knockin mouse, RPE patch-clamp, full-field ERG\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockin with patch-clamp and ERG, single lab, informative negative finding\",\n      \"pmids\": [\"41247777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"OPN3 (opsin 3) in PVN hypothalamic neurons coexpressed with MC4R potentiates Kir7.1 channel activity via Gαi/o signaling under baseline conditions, opposing MC4R-mediated channel closure, and thereby promotes food intake.\",\n      \"method\": \"Patch-clamp electrophysiology, Gαi/o pharmacological inhibition, Opn3 conditional knockout in Mc4r neurons, cAMP assay, feeding behavior\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology with pharmacological pathway dissection and conditional KO, single lab, extends MC4R-Kir7.1 signaling axis\",\n      \"pmids\": [\"39951488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Kir7.1 maintains resting membrane potential in neutrophils and is required for directional sensing (but not cell polarization) during chemotaxis. Oscillating membrane potential depolarizations occur in pseudopods toward chemokine sources, and Kir7.1 is required for this polarized depolarization. Focal depolarization biases pseudopod selection and Kir7.1 regulates GPCR signaling activation.\",\n      \"method\": \"Pharmacological and genetic Kir7.1 inhibition in neutrophils, genetically encoded voltage indicators in zebrafish neutrophils, optogenetic focal depolarization, chemotaxis assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacological loss-of-function with live imaging and optogenetics, preprint not peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.03.06.641746\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Anticodon-engineered tRNA (ACE-tRNA) targeting the W53X premature stop codon in KCNJ13 restores full-length Kir7.1 protein and channel function in patient hiPSC-RPE cells, and HDAd delivery in a W53X LCA16 mouse model durably restores vision as measured by retinography.\",\n      \"method\": \"ACE-tRNA suppression, HDAd viral delivery, patch-clamp of hiPSC-RPE, retinography in mouse model\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — channel function rescue confirmed by patch-clamp, in vivo retinography, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.07.10.660754\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"KCNJ13/Kir7.1 is an inwardly rectifying K+ channel with unusually low single-channel conductance (~2 pS), mild rectification, inverse dependence on extracellular K+, and selectivity for K+ and Rb+, that localizes to apical membranes of RPE, choroid plexus, and other epithelia where it co-localizes with Na+,K+-ATPase to recycle K+ and maintain ion homeostasis; its gating is controlled by PIP2 binding at R162/K164, intracellular pH via H26, PKA (Ser287) and PKC (Ser201) phosphorylation, glycosylation at its sole N-glycosylation site, and SUMO-1 modification; in RPE it is essential for photoreceptor survival by maintaining subretinal K+ homeostasis and supporting phagocytosis, and mutations cause LCA16 (recessive loss-of-function) or snowflake vitreoretinal degeneration (dominant-negative R162W); in hypothalamic MC4R neurons it mediates G-protein-independent melanocortin regulation of energy homeostasis by coupling receptor activation to channel opening or closing; in uterine myometrium it is directly activated by progesterone to maintain gestational quiescence; and in the choroid plexus it sets CSF K+ concentration and is functionally coupled to NKCC1.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"KCNJ13 encodes Kir7.1, an inwardly rectifying K+ channel with a distinctive low (~2 pS) unitary conductance, mild rectification, an inverse dependence on extracellular K+, and a K+≈Rb+>>Cs+>Na+ selectivity that constitutes the apical K+ conductance of polarized epithelia [#1, #2]. Across tissues it localizes to membrane domains adjacent to Na+,K+-ATPase, consistent with a role in recycling K+ to sustain pump-driven transport [#0, #2]. Channel gating is governed by PIP2 binding at R162 (with K159/K164), by intracellular pH via the N-terminal H26, and by dual phosphorylation (PKC-inhibitory Ser201, PKA-stimulatory Ser287); complex glycosylation at its sole N-glycosylation site sets conductance and open probability, and SUMO-1 modification controls surface expression [#27, #7, #9, #21, #29]. C-terminal length is required for plasma-membrane targeting [#6], and conserved inner-pore residues (T153, M125) determine both K+ permeation and inhibitor access [#30, #19, #37]. In the retinal pigment epithelium Kir7.1 maintains subretinal K+ homeostasis and supports phagocytosis of photoreceptor outer segments, and its loss causes photoreceptor degeneration; this RPE requirement is cell-autonomous as shown by mosaic and tissue-specific deletion [#14, #22, #25, #17]. Human mutations cause inherited blindness: recessive loss-of-function alleles (e.g. W53X, T153I, L241P) underlie Leber congenital amaurosis type 16, while the dominant R162W allele converts the channel to a nonselective cation conductance and acts dominant-negatively by disrupting PIP2 gating in snowflake vitreoretinal degeneration [#15, #30, #8, #10, #27]. Beyond the eye, Kir7.1 acts as a G-protein-independent effector of MC4R signaling in hypothalamic PVN neurons to regulate energy homeostasis [#13, #23], is directly activated by progesterone through a nongenomic mechanism to maintain uterine quiescence [#12, #28, #36], and sets cerebrospinal fluid K+ in choroid plexus where it is functionally coupled to NKCC1 and Na+,K+-ATPase [#37]. Gene-correction strategies including base editing and tRNA suppression restore channel function and vision in LCA16 models [#32, #41].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established where Kir7.1 protein resides in epithelia, linking it to transepithelial ion transport machinery rather than a defined function.\",\n      \"evidence\": \"Immunohistochemistry and fractionation in thyroid and choroid plexus epithelia\",\n      \"pmids\": [\"10455019\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional reconstitution of channel activity\", \"Co-localization does not prove physical or functional coupling to Na+,K+-ATPase\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined Kir7.1 as the molecular identity of the RPE apical K+ conductance and characterized its unusual biophysical signature, converting a candidate gene into a functional channel.\",\n      \"evidence\": \"Two-electrode voltage-clamp in oocytes and patch-clamp of native bovine RPE with noise analysis, plus EM localization and heterologous patch-clamp\",\n      \"pmids\": [\"11230507\", \"11179389\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of low conductance and inverse K+ dependence unresolved\", \"Gating regulators not yet identified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified C-terminal length as a trafficking determinant and used a zebrafish pigment mutant to show channel activity governs cellular signaling output, broadening Kir7.1 roles beyond epithelial K+ recycling.\",\n      \"evidence\": \"Deletion mutagenesis with surface biotinylation in MDCK; positional cloning, patch-clamp and BAC rescue in zebrafish jaguar/obelix\",\n      \"pmids\": [\"16406822\", \"17121467\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Trafficking motif within the C-terminus not pinpointed\", \"Mechanism linking channel activity to melanosome dispersion downstream of adrenoceptors unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined gating regulators (pH via H26, PKC/PKA phosphorylation) and the molecular pathology of the dominant SVD R162W allele, distinguishing it as a gain-of-toxic-function changing ion selectivity.\",\n      \"evidence\": \"Oocyte voltage-clamp with site-directed mutagenesis; CHO patch-clamp and molecular modeling of R162W\",\n      \"pmids\": [\"18094146\", \"18976636\", \"18179896\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological kinase signaling inputs in vivo not established\", \"Initial selectivity-change interpretation not yet reconciled with later dominant-negative gating model\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Resolved the R162W mechanism as a PIP2-gating-disrupting dominant-negative that still traffics to the membrane, clarifying why SVD is dominant.\",\n      \"evidence\": \"Co-injection oocyte voltage-clamp and immunostaining; CHO co-expression and homology modeling\",\n      \"pmids\": [\"23255580\", \"23977131\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct demonstration of PIP2-binding loss awaited\", \"Stoichiometry of mutant/WT subunit mixing not quantified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended Kir7.1 function to myometrial physiology, showing it sets membrane potential to enforce gestational quiescence.\",\n      \"evidence\": \"Bidirectional lentiviral knockdown/overexpression, contractility assays, VU590 pharmacology and patch-clamp\",\n      \"pmids\": [\"25056913\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream regulator driving labor-associated Kir7.1 downregulation not identified at this stage\", \"Direct activator of the channel in myometrium unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated a novel G-protein-independent signaling role: MC4R directly couples to Kir7.1 in hypothalamic neurons to control energy balance, with α-MSH closing and AgRP opening the channel.\",\n      \"evidence\": \"Hypothalamic slice patch-clamp in mice with Gαs pathway dissection and ligand-binding studies\",\n      \"pmids\": [\"25600267\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physical nature of the MC4R–Kir7.1 coupling not structurally defined\", \"How a single channel produces opposite responses to two ligands unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established in vivo that RPE Kir7.1 is required cell-autonomously for photoreceptor survival and explained recessive LCA16 inheritance, distinguishing it from dominant SVD.\",\n      \"evidence\": \"CRISPR mosaic deletion, Kcnj13 knockout, shRNA knockdown with ERG; heterologous expression of LCA nonsense mutant showing no dominant-negative effect\",\n      \"pmids\": [\"25666713\", \"26402555\", \"25921210\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Complete-knockout postnatal lethality precluded adult retinal analysis\", \"Whether degeneration reflects K+ buffering versus other RPE functions unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Tied RPE Kir7.1 function to whole-retina electrophysiology via subretinal K+ control and mapped the VU590 inhibitor binding mechanism within the pore.\",\n      \"evidence\": \"In vivo shRNA/VU590 with ERG and isolated-retina controls; native RPE patch-clamp; mutagenesis and modeling of pore residues; OXTR modulation experiments\",\n      \"pmids\": [\"28878288\", \"28619748\", \"28603013\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ERG deficits arise solely from altered subretinal K+ unresolved\", \"Physiological role of oxytocin modulation of RPE Kir7.1 unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealed glycosylation as a GPCR-tunable modulator of channel activity and uncovered developmental roles in palatogenesis and tracheal smooth-muscle morphogenesis linking ion homeostasis to AKT-dependent actin polymerization.\",\n      \"evidence\": \"Glycosylation-site mutagenesis with single-channel recording across GPCRs; conditional RPE knockout with ERG/OCT; ENU mutant mouse with AKT pharmacological rescue\",\n      \"pmids\": [\"30257863\", \"30009826\", \"30022023\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling chain from channel activity to AKT phosphorylation not fully defined\", \"How GPCRs reduce glycosylation mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Confirmed in vivo that Kir7.1 is the downstream effector of MC4R for energy homeostasis and dissected RPE phagosome/mitochondrial pathology preceding degeneration.\",\n      \"evidence\": \"MC4R-Cre conditional Kcnj13 knockout with slice electrophysiology and metabolic phenotyping; zebrafish mutant EM, ATP and mitochondrial analysis\",\n      \"pmids\": [\"30561082\", \"30846767\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether phagosome defect is primary or secondary to ion imbalance unresolved\", \"Molecular link between channel activity and phagocytic gene expression unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated a direct requirement for Kir7.1 in human RPE phagocytosis and identified additional roles in oligodendrocyte integrity under ischemic stress.\",\n      \"evidence\": \"CRISPR knockout in hiPSC-RPE with phagocytosis assays and qPCR; oligodendrocyte patch-clamp with VU590 in an OGD model\",\n      \"pmids\": [\"32437550\", \"32086565\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism coupling K+ conductance to phagocytic machinery undefined\", \"Oligodendrocyte phenotype rests on pharmacology without genetic confirmation\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified progesterone as a direct, receptor-independent activator of Kir7.1, providing a molecular basis for hormonal control of channel-dependent tissues.\",\n      \"evidence\": \"Patch-clamp of native choroid plexus and RPE cells and recombinant channel with receptor antagonists\",\n      \"pmids\": [\"34387656\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding site for progesterone on the channel not localized\", \"Physiological consequences in choroid plexus and RPE not tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined pore residue determinants of conductance through disease mutations and identified SUMOylation as a surface-expression regulator relevant to neuropathic pain.\",\n      \"evidence\": \"Systematic mutagenesis of T153 with patch-clamp; Co-IP, surface fractionation, SUMOylation inhibitors and von Frey behavior; conditional RPE knockout with lentiviral rescue\",\n      \"pmids\": [\"35584325\", \"35633059\", \"35096838\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SUMO-1 acceptor lysine on Kir7.1 not mapped\", \"Lentiviral rescue restored only the c-wave, leaving photoreceptor-level rescue unachieved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showed that gene correction restores Kir7.1 function and vision, establishing therapeutic tractability of LCA16.\",\n      \"evidence\": \"Adenine base editing of W53X in patient fibroblasts and hiPSC-RPE with patch-clamp, and in vivo ERG/OCT in an LCA16 mouse\",\n      \"pmids\": [\"37561581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Editing efficiency in RPE remained partial\", \"Durability and off-target profile not fully resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Provided the first structural views of human Kir7.1 gating and the MC4R–Kir7.1 complex, and showed the channel is a clinically relevant target for antipsychotic-associated weight effects.\",\n      \"evidence\": \"Cryo-EM with mutagenesis and ML418 pharmacology (preprint); MC4R-Cre conditional knockout with electrophysiology, binding/cAMP assays and metabolic phenotyping (preprint)\",\n      \"pmids\": [\"38895219\", \"38895206\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural data are preprint and not peer-reviewed\", \"Assembly stoichiometry of the MC4R–Kir7.1 complex only preliminary\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Distinguished Kir7.1 functions in disease by separating K+-buffering from other roles, extended its physiology to CSF homeostasis, neutrophil chemotaxis and OPN3 modulation, and broadened progesterone activation across reproductive tissues.\",\n      \"evidence\": \"M125R and conditional knockin/knockout mice with CSF K+ and NKCC1 assays, RPE patch-clamp/ERG; native myometrium and pericyte patch-clamp with progestin panel; OPN3 conditional KO with electrophysiology; voltage-imaging/optogenetics in neutrophils (preprint); ACE-tRNA rescue (preprint)\",\n      \"pmids\": [\"41212743\", \"41247777\", \"40043131\", \"39951488\", \"41212743\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The non-K+-buffering RPE function driving degeneration remains unidentified\", \"Mechanism of Kir7.1–NKCC1 coupling not biochemically resolved\", \"Neutrophil and tRNA-rescue findings remain preprint\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How Kir7.1 physically couples to MC4R and to NKCC1/Na+,K+-ATPase, and which RPE function beyond subretinal K+ buffering drives photoreceptor degeneration, remain the central open mechanistic questions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No peer-reviewed structure of the MC4R–Kir7.1 complex\", \"Direct progesterone-binding site on the channel unmapped\", \"The disease-relevant non-K+-buffering RPE role unidentified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [1, 2, 30, 37]},\n      {\"term_id\": \"GO:0005216\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [13, 23]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2, 3, 6, 35]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [1, 37]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [13, 23, 39]},\n      {\"term_id\": \"R-HSA-9709957\", \"supporting_discovery_ids\": [14, 17, 22]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"MC4R\", \"NKCC1\", \"OPN3\", \"OXTR\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}