{"gene":"ANK3","run_date":"2026-06-09T22:02:43","timeline":{"discoveries":[{"year":1995,"finding":"ANK3/Ank3 encodes a modular ankyrin protein (ankyrin-G) with an N-terminal repeat domain, a central spectrin-binding domain, and a C-terminal regulatory domain. The repeat domain is required for polarized membrane localization; isoforms lacking it show diffuse cytoplasmic distribution rather than polarized targeting in epithelial cells.","method":"cDNA cloning, Northern blotting, immunocytochemistry, immunoblotting of tissue-specific isoforms","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — full molecular characterization (cloning, domain mapping, localization) with multiple orthogonal methods; foundational study replicated across tissues","pmids":["7615634"],"is_preprint":false},{"year":1998,"finding":"Distinct ANK3 spliceoforms are differentially distributed between renal proximal and distal tubule cells: the larger 200/215 kDa isoforms (which bind Na-K-ATPase) are enriched in distal tubule, whereas proximal tubule expresses predominantly smaller isoforms, suggesting isoform-specific organization of Na-K-ATPase.","method":"Isolation of proximal vs. distal tubule fragments by fluorescence microscopy, immunoblotting with anti-regulatory-domain antibody, densitometric analysis; corroborated in LLC-PK1 and MDCK cell lines","journal":"The American journal of physiology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct fractionation with functional consequence (Na-K-ATPase ratio), replicated in two cell lines, single lab","pmids":["9458832"],"is_preprint":false},{"year":2011,"finding":"Ank3 is specifically upregulated in ventricular progenitors destined to become ependymal cells (not in neural stem cells) and is required for lateral adhesion of progenitors during SVZ niche assembly; Foxj1 transcriptionally controls Ank3 expression, and loss of the Foxj1-Ank3 pathway from mature ependyma depletes adult neurogenesis.","method":"Genetic knockout (Foxj1 conditional deletion), immunofluorescence, in vivo neurogenesis assays, inducible deletion of Foxj1-Ank3 in mature ependyma","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis (Foxj1→Ank3 pathway), loss-of-function with specific cellular phenotype, multiple orthogonal approaches in one study","pmids":["21745638"],"is_preprint":false},{"year":2014,"finding":"Ankyrin-G forms distinct nanodomain structures within the dendritic spine head and neck (resolved by superresolution microscopy), where it modulates mushroom spine morphology and AMPAR-mediated synaptic transmission, acts as a perisynaptic scaffold/barrier, accumulates in spine subdomains in response to neuronal activity, and differentially regulates NMDA receptor-dependent plasticity depending on location.","method":"Superresolution (STORM/PALM) microscopy, shRNA knockdown, electrophysiology (mEPSC recording), spine morphology analysis","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — superresolution structure combined with functional electrophysiology and loss-of-function; multiple orthogonal methods in single study","pmids":["25374361"],"is_preprint":false},{"year":2013,"finding":"Loss-of-function of ANK3 (complete disruption by balanced translocation in a patient, and homozygous truncating frameshift in a consanguineous family) causes intellectual disability, ADHD, autism, and sleep problems; ANK3 knockdown in a Drosophila model produces memory defects, establishing a causal role in cognitive function.","method":"Human genetics (balanced translocation, frameshift mutation), Drosophila unc-44 (ANK3 ortholog) RNAi knockdown with behavioral memory assays","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human loss-of-function genetics corroborated by model-organism knockdown with specific phenotypic readout; single lab, two orthogonal approaches","pmids":["23390136"],"is_preprint":false},{"year":2012,"finding":"Viral RNA interference of Ank3 specifically in hippocampal dentate gyrus reduces anxiety-related behaviors and increases light-phase activity in mice, effects reversible by chronic lithium treatment; heterozygous Ank3 knockout mice show similar anxiety/reward phenotypes that shift to depression-like features after chronic stress, and exhibit elevated serum corticosterone, demonstrating Ank3 regulates stress reactivity.","method":"Viral-mediated RNAi in hippocampus, heterozygous knockout mouse, behavioral battery (open field, light-dark, elevated plus maze), lithium treatment, corticosterone assay","journal":"Biological psychiatry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO plus region-specific RNAi with multiple behavioral readouts, pharmacological rescue with lithium, HPA-axis measurement; two complementary loss-of-function approaches","pmids":["23237312"],"is_preprint":false},{"year":2015,"finding":"A splice-site SNP (rs41283526) in an alternatively spliced exon of ANK3 is a loss-of-function variant that disables correct splicing of a minor isoform whose transcription is initiated in early adolescence; the minor allele is protective against bipolar disorder (OR=0.31) and schizophrenia (OR=0.21), indicating that elevated expression of this isoform promotes disease risk.","method":"Genome-wide genotyping (Illumina Human Exome BeadChip), case-control association, replication in two independent samples, qPCR splice-junction quantification in blood cDNA, BrainSpan developmental transcriptome analysis","journal":"Biological psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional splicing assay plus replication in two cohorts; isoform identity confirmed by expression data, single lab","pmids":["26682468"],"is_preprint":false},{"year":2015,"finding":"Alternative splicing of the Ank3 cardiac gene yields at least 28 splice variants including two new exons; exon 1d is heart/skeletal-muscle-specific (absent in brain, kidney, cerebellum, lung). Two rare variants excising part of the ZU5 motif (minimal spectrin-binding domain) abolish β-spectrin binding. Cardiac ankyrin-G co-localizes with NaV1.5 at the intercalated disc and also localizes to the Z-line.","method":"PCR-based splice-variant screen, qRT-PCR with exon-junction-spanning primers, immunoblotting, immunofluorescence co-localization with NaV1.5, β-spectrin binding assay for ZU5-deletion variants","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro binding assay (mutagenesis of ZU5 domain + β-spectrin binding) combined with localization imaging; multiple orthogonal methods","pmids":["26024478"],"is_preprint":false},{"year":2017,"finding":"Ank3 haploinsufficiency in mice is associated with proteomic changes in hippocampus that implicate kinesin-related axonal transport and glutamate signaling; targeted SRM proteomics confirmed altered abundance of ANK3 interaction partners in these pathways, and chronic lithium treatment reversed both behavioral phenotypes and this molecular signature.","method":"Heterozygous Ank3 knockout mouse, tandem mass spectrometry (MSE), selected reaction monitoring (SRM), protein-protein interaction network clustering, behavioral tests (NSF, EPM, PAT), lithium treatment","journal":"European neuropsychopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative proteomics plus SRM validation plus behavioral rescue; single lab, multiple orthogonal methods","pmids":["28109561"],"is_preprint":false},{"year":2018,"finding":"A minor ANK3 isoform (incorporating exon ENSE00001786716) is significantly overexpressed in bipolar disorder and schizophrenia patients relative to controls; its transcription start site is in the corpus callosum, and BD-risk GWAS alleles are located near this isoform's transcription start site and are significantly associated with its elevated expression (cis-eQTL).","method":"PacBio full-length cDNA sequencing (transcription start site mapping), ddPCR + high-throughput sequencing of indexed amplicons, quantitative PCR, genotype-expression association in large Norwegian cohort","journal":"Translational psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cis-eQTL plus direct TSS mapping by long-read sequencing; single lab, multiple orthogonal methods","pmids":["30297702"],"is_preprint":false},{"year":2022,"finding":"Ank3 conditional knockout in adult forebrain pyramidal neurons or AnkG knockdown in cortical cultures decreases dendritic arborization complexity and dendritic spine number; lithium rescues both deficits in vitro and in vivo. Mechanistically, GSK3β inhibition (CHIR99021) rescues spine morphology defects while adenylate cyclase activation (forskolin) rescues dendrite complexity, and synergistic action of both pathways is required to rescue dendrite and spine density together.","method":"Conditional Ank3 knockout mouse (forebrain pyramidal neurons), shRNA knockdown in cortical neuron cultures, confocal morphometry of dendrites and spines, pharmacological rescue (lithium, CHIR99021, forskolin)","journal":"Neuropsychopharmacology","confidence":"High","confidence_rationale":"Tier 2 / Strong — two complementary loss-of-function models (in vivo KO + in vitro KD), multiple pharmacological pathway probes, in vitro and in vivo rescue; single lab but multiple orthogonal methods","pmids":["36376465"],"is_preprint":false},{"year":2022,"finding":"ANK3 knockdown in zebrafish results in a coloboma/microphthalmia phenotype, establishing a developmental role for ankyrin-G in optic fissure morphogenesis; ank3a expression is localized to the optic fissure, periocular mesenchyme, and ciliary marginal zone.","method":"Zebrafish morpholino knockdown, in situ hybridization for spatiotemporal expression, phenotypic analysis (coloboma/microphthalmia), BMPR1B rescue as positive control","journal":"Genetics in medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockdown with specific morphological phenotype plus expression localization; zebrafish ortholog model, single lab","pmids":["35034853"],"is_preprint":false},{"year":2023,"finding":"Deletion of the Ank3-1b isoform in mice increases firing threshold and diminishes action potential dynamic range of parvalbumin (PV) interneurons, causes absence epilepsy, increases slow gamma (~25–45 Hz) EEG power, and disrupts sleep (reduced REM). These findings provide a biological mechanism linking PV interneuron dysfunction to epilepsy-bipolar disorder comorbidity.","method":"Ank3-1b knockout mouse, EEG/video recording, overnight home-cage behavioral analysis, REM/NREM sleep staging, gamma power analysis","journal":"Translational psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with specific electrophysiological and sleep readouts; single lab, multiple phenotypic measures","pmids":["38123552"],"is_preprint":false},{"year":2025,"finding":"The BD-associated ANK3 variant p.W1989R disrupts the ankyrin-G/GABARAP interaction, causing inhibitory (GABAergic) synaptic deficits and cortical pyramidal neuron hyperexcitability. Chronic lithium treatment rescues these deficits by selectively enhancing presynaptic GABAergic neurotransmission and partially restoring AIS length, an effect recapitulated by the selective GSK3β inhibitor Tideglusib.","method":"Knock-in mouse model (ANK3 p.W1989R), patch-clamp electrophysiology, immunofluorescence (GABAergic synapse density, AIS length), pharmacological rescue (lithium, Tideglusib), co-immunoprecipitation of ankyrin-G/GABARAP","journal":"Neuropharmacology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — variant knock-in mouse with binding interaction data (Co-IP), electrophysiological rescue, and AIS structural rescue; multiple orthogonal methods, both peer-reviewed and preprint concordant","pmids":["40849089","37961630"],"is_preprint":false},{"year":2025,"finding":"A deeply conserved microexon E35a in Ank3 is predominantly skipped in cortical glutamatergic neurons but included in cortical GABAergic neurons and cerebellar neurons, controlled by multiple neuronal splicing factors. E35a deletion increases interneuron excitability and somatic Ca2+ activity without disrupting AIS structure. Biochemically, E35a inclusion facilitates AnkG interaction with a complex containing inositol trisphosphate receptors (InsP3Rs), linking AnkG to intracellular Ca2+ signaling in a neuron type-specific manner.","method":"E35a-deletion mouse (CRISPR), single-cell electrophysiology, two-photon Ca2+ imaging, biochemical co-immunoprecipitation (AnkG–InsP3R complex), splicing factor knockdown assays, AIS immunostaining","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reconstitution-level biochemistry (IP of AnkG–InsP3R complex) combined with genetic KO, electrophysiology, and Ca2+ imaging; multiple orthogonal methods in peer-reviewed study","pmids":["41688438"],"is_preprint":false},{"year":2025,"finding":"ANK3 inhibits hepatocellular carcinoma metastasis by binding E-cadherin via its N-terminal ankyrin repeat domain, preventing E-cadherin protein degradation and suppressing the Wnt signaling pathway; ANK3 knockdown activates Wnt, downregulates E-cadherin, and promotes its degradation.","method":"shRNA knockdown in 786-O HCC cells, overexpression of ANK3-TV4, CCK-8 proliferation assay, invasion/migration assay, Western blot (E-cadherin, Wnt pathway components, EMT markers), in vivo xenograft, co-immunoprecipitation (ANK3–E-cadherin)","journal":"Frontiers in bioscience (Landmark edition)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying binding partner (E-cadherin via ankyrin repeat domain), KD + OE with functional pathway readouts; single lab","pmids":["41198552"],"is_preprint":false},{"year":2025,"finding":"Ank3-1b deletion disrupts cortical excitatory-inhibitory balance (reduced sink/source ratios, elevated AVREC), impairs sensory-evoked intra-columnar connectivity, increases low-frequency spike-field coherence, and delays inhibitory neuron latencies in a layer-specific manner, indicating thalamocortical circuit deficits downstream of PV interneuron dysfunction.","method":"Ank3-1b KO mouse, laminar electrophysiology, spike-field coherence analysis, single-unit recordings, current source density analysis","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — genetic KO with detailed electrophysiological circuit analysis; preprint, single lab, not yet peer-reviewed","pmids":["bio_10.1101_2025.11.22.689933"],"is_preprint":true}],"current_model":"ANK3/ankyrin-G is a scaffolding protein with distinct domain architecture (ankyrin-repeat, spectrin-binding, and regulatory domains) that organizes the axon initial segment and nodes of Ranvier by clustering voltage-gated sodium channels, potassium channels (KCNQ2/3), and cell adhesion molecules; at glutamatergic synapses it forms perisynaptic nanodomains that regulate AMPAR-mediated transmission, spine morphology, and NMDAR-dependent plasticity; it stabilizes inhibitory synapses via direct interaction with GABARAP, and a BD-associated variant (p.W1989R) disrupts this interaction causing GABAergic deficits and pyramidal neuron hyperexcitability reversible by lithium through GSK3β inhibition; a neuron-type-specific microexon (E35a) controls interneuron excitability by linking AnkG to InsP3R-dependent Ca²⁺ signaling; in epithelia it tethers Na-K-ATPase and other membrane proteins to the spectrin skeleton in an isoform-dependent manner; and in the SVZ it mediates ependymal progenitor lateral adhesion downstream of Foxj1 to sustain the neurogenic niche."},"narrative":{"mechanistic_narrative":"ANK3 encodes ankyrin-G, a modular scaffolding protein (N-terminal ankyrin-repeat domain, central spectrin-binding domain, C-terminal regulatory domain) whose ankyrin-repeat domain is required for polarized membrane targeting and whose spectrin-binding ZU5 motif mediates β-spectrin association [PMID:7615634, PMID:26024478]. Through these domains it tethers membrane proteins to the spectrin cytoskeleton in a tissue- and isoform-specific manner: larger isoforms organize Na-K-ATPase in renal distal tubule epithelia [PMID:9458832], and a cardiac-specific isoform co-localizes with NaV1.5 at the intercalated disc and Z-line [PMID:26024478]. In neurons, ankyrin-G forms perisynaptic nanodomains within dendritic spines that modulate spine morphology, AMPAR-mediated transmission, and NMDAR-dependent plasticity [PMID:25374361], and loss of function in forebrain pyramidal neurons reduces dendritic arborization and spine density through GSK3β- and adenylate-cyclase-dependent pathways rescuable by lithium [PMID:36376465]. It stabilizes inhibitory synapses via direct interaction with GABARAP; the bipolar-disorder-associated variant p.W1989R disrupts this interaction, producing GABAergic deficits and pyramidal-neuron hyperexcitability reversible by lithium acting through GSK3β [PMID:40849089, PMID:37961630]. Isoform diversity tunes neuron-type-specific function: an Ank3-1b isoform sets parvalbumin interneuron firing threshold and its deletion causes absence epilepsy and disrupted sleep [PMID:38123552], while a conserved microexon E35a, included in GABAergic but skipped in glutamatergic neurons, links ankyrin-G to InsP3R-dependent intracellular Ca2+ signaling to control interneuron excitability [PMID:41688438]. Beyond the nervous system, ankyrin-G acts downstream of Foxj1 to mediate ependymal progenitor lateral adhesion sustaining the adult neurogenic niche [PMID:21745638], is required for optic fissure morphogenesis [PMID:35034853], and suppresses hepatocellular carcinoma metastasis by binding E-cadherin through its ankyrin-repeat domain to restrain Wnt signaling [PMID:41198552]. Human loss-of-function disrupting ANK3 causes intellectual disability, ADHD, autism, and sleep problems [PMID:23390136].","teleology":[{"year":1995,"claim":"Established the modular domain architecture of ankyrin-G and showed that the ankyrin-repeat domain, not the rest of the protein, drives polarized membrane targeting — defining the structural basis of its scaffolding function.","evidence":"cDNA cloning, isoform immunolocalization in epithelial cells","pmids":["7615634"],"confidence":"High","gaps":["Did not identify the membrane partners engaged by each domain","Mechanism of repeat-domain targeting not resolved at the binding level"]},{"year":1998,"claim":"Showed that distinct ANK3 spliceoforms partition between renal tubule segments and that the larger isoforms organize Na-K-ATPase, demonstrating isoform-specific tethering of membrane transporters to the spectrin skeleton.","evidence":"Tubule fractionation, isoform immunoblotting, replication in LLC-PK1/MDCK cells","pmids":["9458832"],"confidence":"High","gaps":["Direct binding stoichiometry to Na-K-ATPase not quantified","Functional consequence for transport activity inferred, not measured"]},{"year":2011,"claim":"Placed Ank3 in a Foxj1-controlled transcriptional pathway required for ependymal progenitor lateral adhesion, revealing a non-neuronal role in sustaining the adult neurogenic niche.","evidence":"Foxj1 conditional knockout, in vivo neurogenesis assays, inducible ependymal deletion","pmids":["21745638"],"confidence":"High","gaps":["Adhesion partners engaged by Ank3 in ependyma not identified","Whether the cytoskeletal mechanism mirrors that in neurons unknown"]},{"year":2012,"claim":"Demonstrated that region-specific Ank3 reduction in dentate gyrus and heterozygous loss alter stress reactivity and anxiety/reward behaviors reversibly by lithium, linking the gene to mood-disorder-relevant circuits.","evidence":"Hippocampal viral RNAi, heterozygous KO mouse, behavioral battery, corticosterone assay, lithium treatment","pmids":["23237312"],"confidence":"High","gaps":["Molecular target of lithium rescue not defined in this study","Cellular mechanism connecting Ank3 to HPA-axis output unresolved"]},{"year":2013,"claim":"Established that human ANK3 loss of function causes a neurodevelopmental disorder, with memory defects on ortholog knockdown, providing causal genetic evidence for a cognitive role.","evidence":"Human translocation/frameshift genetics, Drosophila unc-44 RNAi with memory assays","pmids":["23390136"],"confidence":"Medium","gaps":["Single family for the recessive allele","Cellular pathology underlying the cognitive phenotype not characterized"]},{"year":2014,"claim":"Resolved ankyrin-G into discrete nanodomains within dendritic spines that act as perisynaptic scaffolds/barriers regulating AMPAR transmission and NMDAR-dependent plasticity, extending its scaffolding role to excitatory synapses.","evidence":"STORM/PALM superresolution, shRNA knockdown, mEPSC electrophysiology, spine morphometry","pmids":["25374361"],"confidence":"High","gaps":["Synaptic binding partners within the nanodomain not enumerated","How activity drives subdomain accumulation mechanistically unclear"]},{"year":2015,"claim":"Linked specific minor ANK3 isoforms and their splicing/expression regulation to bipolar disorder and schizophrenia risk, indicating that isoform dosage rather than total ANK3 loss drives psychiatric risk.","evidence":"Exome genotyping with case-control association and replication, splice-junction qPCR, BrainSpan analysis; later confirmed by PacBio TSS mapping and cis-eQTL in a Norwegian cohort","pmids":["26682468","30297702"],"confidence":"Medium","gaps":["Functional protein consequence of the risk isoform not established","Causal cell type and circuit for isoform effect unknown"]},{"year":2015,"claim":"Defined cardiac/muscle-specific exon usage and identified ZU5-deletion variants that abolish β-spectrin binding while mapping ankyrin-G to the intercalated disc and Z-line, establishing the spectrin-binding requirement at the molecular level.","evidence":"Splice-variant PCR screen, ZU5-mutagenesis β-spectrin binding assay, NaV1.5 co-localization imaging","pmids":["26024478"],"confidence":"High","gaps":["Physiological consequence of ZU5 variants in vivo not tested","Cardiac NaV1.5 organization mechanism not functionally validated"]},{"year":2017,"claim":"Connected Ank3 haploinsufficiency to hippocampal proteomic changes in axonal transport and glutamate signaling reversible by lithium, providing a molecular signature for the behavioral phenotype and its pharmacological rescue.","evidence":"Heterozygous KO mouse, MSE/SRM proteomics, interaction-network clustering, behavioral tests, lithium","pmids":["28109561"],"confidence":"Medium","gaps":["Correlative proteomics does not establish direct interaction changes","Direct lithium target not pinpointed"]},{"year":2022,"claim":"Showed that ankyrin-G maintains dendritic arborization and spine density in adult pyramidal neurons through parallel GSK3β and adenylate cyclase pathways, identifying the signaling axes through which lithium reverses structural deficits.","evidence":"Conditional forebrain KO, cortical neuron shRNA, confocal morphometry, pharmacological probes (lithium, CHIR99021, forskolin)","pmids":["36376465"],"confidence":"High","gaps":["How ankyrin-G mechanistically engages these signaling pathways unclear","Direct molecular substrates downstream not defined"]},{"year":2022,"claim":"Identified a developmental requirement for ankyrin-G in optic fissure morphogenesis, broadening its phenotypic spectrum beyond the nervous and epithelial systems.","evidence":"Zebrafish morpholino knockdown, in situ expression mapping, coloboma/microphthalmia phenotyping","pmids":["35034853"],"confidence":"Medium","gaps":["Morpholino specificity limitation","Molecular mechanism in ocular morphogenesis unknown"]},{"year":2023,"claim":"Established that the Ank3-1b isoform sets parvalbumin interneuron excitability and that its loss causes absence epilepsy and sleep disruption, providing a circuit mechanism for epilepsy-bipolar comorbidity.","evidence":"Ank3-1b KO mouse, EEG/video recording, sleep staging, gamma power analysis","pmids":["38123552"],"confidence":"Medium","gaps":["Molecular basis of altered PV firing threshold not resolved","Single lab, single isoform-specific model"]},{"year":2025,"claim":"Demonstrated that the BD-associated p.W1989R variant disrupts the ankyrin-G/GABARAP interaction to weaken inhibitory synapses and drive pyramidal hyperexcitability, with lithium and a selective GSK3β inhibitor rescuing the deficit — directly tying a disease variant, a binding partner, and a therapeutic mechanism.","evidence":"Knock-in mouse, patch-clamp, GABAergic synapse/AIS immunofluorescence, ankyrin-G/GABARAP Co-IP, lithium and Tideglusib rescue","pmids":["40849089","37961630"],"confidence":"High","gaps":["GABARAP-binding interface structure not resolved","How GSK3β inhibition reverses a binding-domain variant mechanistically unclear"]},{"year":2025,"claim":"Showed that a conserved microexon E35a, differentially spliced between glutamatergic and GABAergic neurons, links ankyrin-G to an InsP3R complex and intracellular Ca2+ signaling to set interneuron excitability independent of AIS structure, revealing isoform-encoded functional diversification.","evidence":"E35a-deletion CRISPR mouse, single-cell electrophysiology, two-photon Ca2+ imaging, AnkG-InsP3R Co-IP, splicing-factor knockdown","pmids":["41688438"],"confidence":"High","gaps":["Direct InsP3R-binding interface not mapped","Whether E35a regulation operates in other neuron classes unknown"]},{"year":2025,"claim":"Identified a tumor-suppressive role for ANK3 in hepatocellular carcinoma via ankyrin-repeat-domain binding of E-cadherin that stabilizes it and restrains Wnt signaling, extending its scaffolding role to adhesion-coupled oncogenic pathways.","evidence":"shRNA knockdown and ANK3-TV4 overexpression in HCC cells, proliferation/invasion assays, Western blot, xenograft, ANK3-E-cadherin Co-IP","pmids":["41198552"],"confidence":"Medium","gaps":["Single lab, single cell context","Mechanism by which ANK3 prevents E-cadherin degradation not resolved"]},{"year":null,"claim":"How distinct ANK3 isoforms and microexons are deployed across cell types to assemble partner-specific scaffolds — and how these molecular events translate into the divergent psychiatric, epilepsy, developmental, and oncogenic phenotypes — remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model of how each domain/exon selects its partner","Mechanism connecting lithium/GSK3β rescue to ankyrin-G scaffolding not defined","Causal link between specific risk isoforms and cellular pathology unestablished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1,7]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,13,14]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,7]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[2,15]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1,7]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,7]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,3]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[3,12,14]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10,13,15]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,11]}],"complexes":["axon initial segment","node of Ranvier"],"partners":["SPTBN (Β-SPECTRIN)","ATP1A (NA-K-ATPASE)","SCN5A (NAV1.5)","GABARAP","ITPR (INSP3R)","CDH1 (E-CADHERIN)"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q12955","full_name":"Ankyrin-3","aliases":["Ankyrin-G"],"length_aa":4377,"mass_kda":480.4,"function":"Membrane-cytoskeleton linker. May participate in the maintenance/targeting of ion channels and cell adhesion molecules at the nodes of Ranvier and axonal initial segments (PubMed:7836469). In skeletal muscle, required for costamere localization of DMD and betaDAG1 (By similarity). Regulates KCNA1 channel activity in function of dietary Mg(2+) levels, and thereby contributes to the regulation of renal Mg(2+) reabsorption (PubMed:23903368). Required for intracellular adhesion and junctional conductance in myocytes, potentially via stabilization of GJA1/CX43 protein abundance and promotion of PKP2, GJA1/CX43, and SCN5A/Nav1.5 localization to cell-cell junctions (By similarity) May be part of a Golgi-specific membrane cytoskeleton in association with beta-spectrin","subcellular_location":"Cytoplasm, cytoskeleton; Golgi apparatus","url":"https://www.uniprot.org/uniprotkb/Q12955/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ANK3","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ANK3","total_profiled":1310},"omim":[{"mim_id":"617519","title":"NEURODEVELOPMENTAL DISORDER WITH HYPOTONIA, NEUROPATHY, AND DEAFNESS; 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\"ANK3/Ank3 encodes a modular ankyrin protein (ankyrin-G) with an N-terminal repeat domain, a central spectrin-binding domain, and a C-terminal regulatory domain. The repeat domain is required for polarized membrane localization; isoforms lacking it show diffuse cytoplasmic distribution rather than polarized targeting in epithelial cells.\",\n      \"method\": \"cDNA cloning, Northern blotting, immunocytochemistry, immunoblotting of tissue-specific isoforms\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — full molecular characterization (cloning, domain mapping, localization) with multiple orthogonal methods; foundational study replicated across tissues\",\n      \"pmids\": [\"7615634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Distinct ANK3 spliceoforms are differentially distributed between renal proximal and distal tubule cells: the larger 200/215 kDa isoforms (which bind Na-K-ATPase) are enriched in distal tubule, whereas proximal tubule expresses predominantly smaller isoforms, suggesting isoform-specific organization of Na-K-ATPase.\",\n      \"method\": \"Isolation of proximal vs. distal tubule fragments by fluorescence microscopy, immunoblotting with anti-regulatory-domain antibody, densitometric analysis; corroborated in LLC-PK1 and MDCK cell lines\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct fractionation with functional consequence (Na-K-ATPase ratio), replicated in two cell lines, single lab\",\n      \"pmids\": [\"9458832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Ank3 is specifically upregulated in ventricular progenitors destined to become ependymal cells (not in neural stem cells) and is required for lateral adhesion of progenitors during SVZ niche assembly; Foxj1 transcriptionally controls Ank3 expression, and loss of the Foxj1-Ank3 pathway from mature ependyma depletes adult neurogenesis.\",\n      \"method\": \"Genetic knockout (Foxj1 conditional deletion), immunofluorescence, in vivo neurogenesis assays, inducible deletion of Foxj1-Ank3 in mature ependyma\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis (Foxj1→Ank3 pathway), loss-of-function with specific cellular phenotype, multiple orthogonal approaches in one study\",\n      \"pmids\": [\"21745638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Ankyrin-G forms distinct nanodomain structures within the dendritic spine head and neck (resolved by superresolution microscopy), where it modulates mushroom spine morphology and AMPAR-mediated synaptic transmission, acts as a perisynaptic scaffold/barrier, accumulates in spine subdomains in response to neuronal activity, and differentially regulates NMDA receptor-dependent plasticity depending on location.\",\n      \"method\": \"Superresolution (STORM/PALM) microscopy, shRNA knockdown, electrophysiology (mEPSC recording), spine morphology analysis\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — superresolution structure combined with functional electrophysiology and loss-of-function; multiple orthogonal methods in single study\",\n      \"pmids\": [\"25374361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Loss-of-function of ANK3 (complete disruption by balanced translocation in a patient, and homozygous truncating frameshift in a consanguineous family) causes intellectual disability, ADHD, autism, and sleep problems; ANK3 knockdown in a Drosophila model produces memory defects, establishing a causal role in cognitive function.\",\n      \"method\": \"Human genetics (balanced translocation, frameshift mutation), Drosophila unc-44 (ANK3 ortholog) RNAi knockdown with behavioral memory assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human loss-of-function genetics corroborated by model-organism knockdown with specific phenotypic readout; single lab, two orthogonal approaches\",\n      \"pmids\": [\"23390136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Viral RNA interference of Ank3 specifically in hippocampal dentate gyrus reduces anxiety-related behaviors and increases light-phase activity in mice, effects reversible by chronic lithium treatment; heterozygous Ank3 knockout mice show similar anxiety/reward phenotypes that shift to depression-like features after chronic stress, and exhibit elevated serum corticosterone, demonstrating Ank3 regulates stress reactivity.\",\n      \"method\": \"Viral-mediated RNAi in hippocampus, heterozygous knockout mouse, behavioral battery (open field, light-dark, elevated plus maze), lithium treatment, corticosterone assay\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO plus region-specific RNAi with multiple behavioral readouts, pharmacological rescue with lithium, HPA-axis measurement; two complementary loss-of-function approaches\",\n      \"pmids\": [\"23237312\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A splice-site SNP (rs41283526) in an alternatively spliced exon of ANK3 is a loss-of-function variant that disables correct splicing of a minor isoform whose transcription is initiated in early adolescence; the minor allele is protective against bipolar disorder (OR=0.31) and schizophrenia (OR=0.21), indicating that elevated expression of this isoform promotes disease risk.\",\n      \"method\": \"Genome-wide genotyping (Illumina Human Exome BeadChip), case-control association, replication in two independent samples, qPCR splice-junction quantification in blood cDNA, BrainSpan developmental transcriptome analysis\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional splicing assay plus replication in two cohorts; isoform identity confirmed by expression data, single lab\",\n      \"pmids\": [\"26682468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Alternative splicing of the Ank3 cardiac gene yields at least 28 splice variants including two new exons; exon 1d is heart/skeletal-muscle-specific (absent in brain, kidney, cerebellum, lung). Two rare variants excising part of the ZU5 motif (minimal spectrin-binding domain) abolish β-spectrin binding. Cardiac ankyrin-G co-localizes with NaV1.5 at the intercalated disc and also localizes to the Z-line.\",\n      \"method\": \"PCR-based splice-variant screen, qRT-PCR with exon-junction-spanning primers, immunoblotting, immunofluorescence co-localization with NaV1.5, β-spectrin binding assay for ZU5-deletion variants\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro binding assay (mutagenesis of ZU5 domain + β-spectrin binding) combined with localization imaging; multiple orthogonal methods\",\n      \"pmids\": [\"26024478\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Ank3 haploinsufficiency in mice is associated with proteomic changes in hippocampus that implicate kinesin-related axonal transport and glutamate signaling; targeted SRM proteomics confirmed altered abundance of ANK3 interaction partners in these pathways, and chronic lithium treatment reversed both behavioral phenotypes and this molecular signature.\",\n      \"method\": \"Heterozygous Ank3 knockout mouse, tandem mass spectrometry (MSE), selected reaction monitoring (SRM), protein-protein interaction network clustering, behavioral tests (NSF, EPM, PAT), lithium treatment\",\n      \"journal\": \"European neuropsychopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative proteomics plus SRM validation plus behavioral rescue; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"28109561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"A minor ANK3 isoform (incorporating exon ENSE00001786716) is significantly overexpressed in bipolar disorder and schizophrenia patients relative to controls; its transcription start site is in the corpus callosum, and BD-risk GWAS alleles are located near this isoform's transcription start site and are significantly associated with its elevated expression (cis-eQTL).\",\n      \"method\": \"PacBio full-length cDNA sequencing (transcription start site mapping), ddPCR + high-throughput sequencing of indexed amplicons, quantitative PCR, genotype-expression association in large Norwegian cohort\",\n      \"journal\": \"Translational psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cis-eQTL plus direct TSS mapping by long-read sequencing; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"30297702\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Ank3 conditional knockout in adult forebrain pyramidal neurons or AnkG knockdown in cortical cultures decreases dendritic arborization complexity and dendritic spine number; lithium rescues both deficits in vitro and in vivo. Mechanistically, GSK3β inhibition (CHIR99021) rescues spine morphology defects while adenylate cyclase activation (forskolin) rescues dendrite complexity, and synergistic action of both pathways is required to rescue dendrite and spine density together.\",\n      \"method\": \"Conditional Ank3 knockout mouse (forebrain pyramidal neurons), shRNA knockdown in cortical neuron cultures, confocal morphometry of dendrites and spines, pharmacological rescue (lithium, CHIR99021, forskolin)\",\n      \"journal\": \"Neuropsychopharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two complementary loss-of-function models (in vivo KO + in vitro KD), multiple pharmacological pathway probes, in vitro and in vivo rescue; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"36376465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ANK3 knockdown in zebrafish results in a coloboma/microphthalmia phenotype, establishing a developmental role for ankyrin-G in optic fissure morphogenesis; ank3a expression is localized to the optic fissure, periocular mesenchyme, and ciliary marginal zone.\",\n      \"method\": \"Zebrafish morpholino knockdown, in situ hybridization for spatiotemporal expression, phenotypic analysis (coloboma/microphthalmia), BMPR1B rescue as positive control\",\n      \"journal\": \"Genetics in medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockdown with specific morphological phenotype plus expression localization; zebrafish ortholog model, single lab\",\n      \"pmids\": [\"35034853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Deletion of the Ank3-1b isoform in mice increases firing threshold and diminishes action potential dynamic range of parvalbumin (PV) interneurons, causes absence epilepsy, increases slow gamma (~25–45 Hz) EEG power, and disrupts sleep (reduced REM). These findings provide a biological mechanism linking PV interneuron dysfunction to epilepsy-bipolar disorder comorbidity.\",\n      \"method\": \"Ank3-1b knockout mouse, EEG/video recording, overnight home-cage behavioral analysis, REM/NREM sleep staging, gamma power analysis\",\n      \"journal\": \"Translational psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with specific electrophysiological and sleep readouts; single lab, multiple phenotypic measures\",\n      \"pmids\": [\"38123552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The BD-associated ANK3 variant p.W1989R disrupts the ankyrin-G/GABARAP interaction, causing inhibitory (GABAergic) synaptic deficits and cortical pyramidal neuron hyperexcitability. Chronic lithium treatment rescues these deficits by selectively enhancing presynaptic GABAergic neurotransmission and partially restoring AIS length, an effect recapitulated by the selective GSK3β inhibitor Tideglusib.\",\n      \"method\": \"Knock-in mouse model (ANK3 p.W1989R), patch-clamp electrophysiology, immunofluorescence (GABAergic synapse density, AIS length), pharmacological rescue (lithium, Tideglusib), co-immunoprecipitation of ankyrin-G/GABARAP\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — variant knock-in mouse with binding interaction data (Co-IP), electrophysiological rescue, and AIS structural rescue; multiple orthogonal methods, both peer-reviewed and preprint concordant\",\n      \"pmids\": [\"40849089\", \"37961630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A deeply conserved microexon E35a in Ank3 is predominantly skipped in cortical glutamatergic neurons but included in cortical GABAergic neurons and cerebellar neurons, controlled by multiple neuronal splicing factors. E35a deletion increases interneuron excitability and somatic Ca2+ activity without disrupting AIS structure. Biochemically, E35a inclusion facilitates AnkG interaction with a complex containing inositol trisphosphate receptors (InsP3Rs), linking AnkG to intracellular Ca2+ signaling in a neuron type-specific manner.\",\n      \"method\": \"E35a-deletion mouse (CRISPR), single-cell electrophysiology, two-photon Ca2+ imaging, biochemical co-immunoprecipitation (AnkG–InsP3R complex), splicing factor knockdown assays, AIS immunostaining\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reconstitution-level biochemistry (IP of AnkG–InsP3R complex) combined with genetic KO, electrophysiology, and Ca2+ imaging; multiple orthogonal methods in peer-reviewed study\",\n      \"pmids\": [\"41688438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ANK3 inhibits hepatocellular carcinoma metastasis by binding E-cadherin via its N-terminal ankyrin repeat domain, preventing E-cadherin protein degradation and suppressing the Wnt signaling pathway; ANK3 knockdown activates Wnt, downregulates E-cadherin, and promotes its degradation.\",\n      \"method\": \"shRNA knockdown in 786-O HCC cells, overexpression of ANK3-TV4, CCK-8 proliferation assay, invasion/migration assay, Western blot (E-cadherin, Wnt pathway components, EMT markers), in vivo xenograft, co-immunoprecipitation (ANK3–E-cadherin)\",\n      \"journal\": \"Frontiers in bioscience (Landmark edition)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying binding partner (E-cadherin via ankyrin repeat domain), KD + OE with functional pathway readouts; single lab\",\n      \"pmids\": [\"41198552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Ank3-1b deletion disrupts cortical excitatory-inhibitory balance (reduced sink/source ratios, elevated AVREC), impairs sensory-evoked intra-columnar connectivity, increases low-frequency spike-field coherence, and delays inhibitory neuron latencies in a layer-specific manner, indicating thalamocortical circuit deficits downstream of PV interneuron dysfunction.\",\n      \"method\": \"Ank3-1b KO mouse, laminar electrophysiology, spike-field coherence analysis, single-unit recordings, current source density analysis\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — genetic KO with detailed electrophysiological circuit analysis; preprint, single lab, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.11.22.689933\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"ANK3/ankyrin-G is a scaffolding protein with distinct domain architecture (ankyrin-repeat, spectrin-binding, and regulatory domains) that organizes the axon initial segment and nodes of Ranvier by clustering voltage-gated sodium channels, potassium channels (KCNQ2/3), and cell adhesion molecules; at glutamatergic synapses it forms perisynaptic nanodomains that regulate AMPAR-mediated transmission, spine morphology, and NMDAR-dependent plasticity; it stabilizes inhibitory synapses via direct interaction with GABARAP, and a BD-associated variant (p.W1989R) disrupts this interaction causing GABAergic deficits and pyramidal neuron hyperexcitability reversible by lithium through GSK3β inhibition; a neuron-type-specific microexon (E35a) controls interneuron excitability by linking AnkG to InsP3R-dependent Ca²⁺ signaling; in epithelia it tethers Na-K-ATPase and other membrane proteins to the spectrin skeleton in an isoform-dependent manner; and in the SVZ it mediates ependymal progenitor lateral adhesion downstream of Foxj1 to sustain the neurogenic niche.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ANK3 encodes ankyrin-G, a modular scaffolding protein (N-terminal ankyrin-repeat domain, central spectrin-binding domain, C-terminal regulatory domain) whose ankyrin-repeat domain is required for polarized membrane targeting and whose spectrin-binding ZU5 motif mediates β-spectrin association [#0, #7]. Through these domains it tethers membrane proteins to the spectrin cytoskeleton in a tissue- and isoform-specific manner: larger isoforms organize Na-K-ATPase in renal distal tubule epithelia [#1], and a cardiac-specific isoform co-localizes with NaV1.5 at the intercalated disc and Z-line [#7]. In neurons, ankyrin-G forms perisynaptic nanodomains within dendritic spines that modulate spine morphology, AMPAR-mediated transmission, and NMDAR-dependent plasticity [#3], and loss of function in forebrain pyramidal neurons reduces dendritic arborization and spine density through GSK3β- and adenylate-cyclase-dependent pathways rescuable by lithium [#10]. It stabilizes inhibitory synapses via direct interaction with GABARAP; the bipolar-disorder-associated variant p.W1989R disrupts this interaction, producing GABAergic deficits and pyramidal-neuron hyperexcitability reversible by lithium acting through GSK3β [#13]. Isoform diversity tunes neuron-type-specific function: an Ank3-1b isoform sets parvalbumin interneuron firing threshold and its deletion causes absence epilepsy and disrupted sleep [#12], while a conserved microexon E35a, included in GABAergic but skipped in glutamatergic neurons, links ankyrin-G to InsP3R-dependent intracellular Ca2+ signaling to control interneuron excitability [#14]. Beyond the nervous system, ankyrin-G acts downstream of Foxj1 to mediate ependymal progenitor lateral adhesion sustaining the adult neurogenic niche [#2], is required for optic fissure morphogenesis [#11], and suppresses hepatocellular carcinoma metastasis by binding E-cadherin through its ankyrin-repeat domain to restrain Wnt signaling [#15]. Human loss-of-function disrupting ANK3 causes intellectual disability, ADHD, autism, and sleep problems [#4].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established the modular domain architecture of ankyrin-G and showed that the ankyrin-repeat domain, not the rest of the protein, drives polarized membrane targeting — defining the structural basis of its scaffolding function.\",\n      \"evidence\": \"cDNA cloning, isoform immunolocalization in epithelial cells\",\n      \"pmids\": [\"7615634\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the membrane partners engaged by each domain\", \"Mechanism of repeat-domain targeting not resolved at the binding level\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Showed that distinct ANK3 spliceoforms partition between renal tubule segments and that the larger isoforms organize Na-K-ATPase, demonstrating isoform-specific tethering of membrane transporters to the spectrin skeleton.\",\n      \"evidence\": \"Tubule fractionation, isoform immunoblotting, replication in LLC-PK1/MDCK cells\",\n      \"pmids\": [\"9458832\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding stoichiometry to Na-K-ATPase not quantified\", \"Functional consequence for transport activity inferred, not measured\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Placed Ank3 in a Foxj1-controlled transcriptional pathway required for ependymal progenitor lateral adhesion, revealing a non-neuronal role in sustaining the adult neurogenic niche.\",\n      \"evidence\": \"Foxj1 conditional knockout, in vivo neurogenesis assays, inducible ependymal deletion\",\n      \"pmids\": [\"21745638\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Adhesion partners engaged by Ank3 in ependyma not identified\", \"Whether the cytoskeletal mechanism mirrors that in neurons unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated that region-specific Ank3 reduction in dentate gyrus and heterozygous loss alter stress reactivity and anxiety/reward behaviors reversibly by lithium, linking the gene to mood-disorder-relevant circuits.\",\n      \"evidence\": \"Hippocampal viral RNAi, heterozygous KO mouse, behavioral battery, corticosterone assay, lithium treatment\",\n      \"pmids\": [\"23237312\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular target of lithium rescue not defined in this study\", \"Cellular mechanism connecting Ank3 to HPA-axis output unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established that human ANK3 loss of function causes a neurodevelopmental disorder, with memory defects on ortholog knockdown, providing causal genetic evidence for a cognitive role.\",\n      \"evidence\": \"Human translocation/frameshift genetics, Drosophila unc-44 RNAi with memory assays\",\n      \"pmids\": [\"23390136\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single family for the recessive allele\", \"Cellular pathology underlying the cognitive phenotype not characterized\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Resolved ankyrin-G into discrete nanodomains within dendritic spines that act as perisynaptic scaffolds/barriers regulating AMPAR transmission and NMDAR-dependent plasticity, extending its scaffolding role to excitatory synapses.\",\n      \"evidence\": \"STORM/PALM superresolution, shRNA knockdown, mEPSC electrophysiology, spine morphometry\",\n      \"pmids\": [\"25374361\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Synaptic binding partners within the nanodomain not enumerated\", \"How activity drives subdomain accumulation mechanistically unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linked specific minor ANK3 isoforms and their splicing/expression regulation to bipolar disorder and schizophrenia risk, indicating that isoform dosage rather than total ANK3 loss drives psychiatric risk.\",\n      \"evidence\": \"Exome genotyping with case-control association and replication, splice-junction qPCR, BrainSpan analysis; later confirmed by PacBio TSS mapping and cis-eQTL in a Norwegian cohort\",\n      \"pmids\": [\"26682468\", \"30297702\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional protein consequence of the risk isoform not established\", \"Causal cell type and circuit for isoform effect unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined cardiac/muscle-specific exon usage and identified ZU5-deletion variants that abolish β-spectrin binding while mapping ankyrin-G to the intercalated disc and Z-line, establishing the spectrin-binding requirement at the molecular level.\",\n      \"evidence\": \"Splice-variant PCR screen, ZU5-mutagenesis β-spectrin binding assay, NaV1.5 co-localization imaging\",\n      \"pmids\": [\"26024478\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological consequence of ZU5 variants in vivo not tested\", \"Cardiac NaV1.5 organization mechanism not functionally validated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected Ank3 haploinsufficiency to hippocampal proteomic changes in axonal transport and glutamate signaling reversible by lithium, providing a molecular signature for the behavioral phenotype and its pharmacological rescue.\",\n      \"evidence\": \"Heterozygous KO mouse, MSE/SRM proteomics, interaction-network clustering, behavioral tests, lithium\",\n      \"pmids\": [\"28109561\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Correlative proteomics does not establish direct interaction changes\", \"Direct lithium target not pinpointed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed that ankyrin-G maintains dendritic arborization and spine density in adult pyramidal neurons through parallel GSK3β and adenylate cyclase pathways, identifying the signaling axes through which lithium reverses structural deficits.\",\n      \"evidence\": \"Conditional forebrain KO, cortical neuron shRNA, confocal morphometry, pharmacological probes (lithium, CHIR99021, forskolin)\",\n      \"pmids\": [\"36376465\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ankyrin-G mechanistically engages these signaling pathways unclear\", \"Direct molecular substrates downstream not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified a developmental requirement for ankyrin-G in optic fissure morphogenesis, broadening its phenotypic spectrum beyond the nervous and epithelial systems.\",\n      \"evidence\": \"Zebrafish morpholino knockdown, in situ expression mapping, coloboma/microphthalmia phenotyping\",\n      \"pmids\": [\"35034853\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Morpholino specificity limitation\", \"Molecular mechanism in ocular morphogenesis unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established that the Ank3-1b isoform sets parvalbumin interneuron excitability and that its loss causes absence epilepsy and sleep disruption, providing a circuit mechanism for epilepsy-bipolar comorbidity.\",\n      \"evidence\": \"Ank3-1b KO mouse, EEG/video recording, sleep staging, gamma power analysis\",\n      \"pmids\": [\"38123552\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of altered PV firing threshold not resolved\", \"Single lab, single isoform-specific model\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated that the BD-associated p.W1989R variant disrupts the ankyrin-G/GABARAP interaction to weaken inhibitory synapses and drive pyramidal hyperexcitability, with lithium and a selective GSK3β inhibitor rescuing the deficit — directly tying a disease variant, a binding partner, and a therapeutic mechanism.\",\n      \"evidence\": \"Knock-in mouse, patch-clamp, GABAergic synapse/AIS immunofluorescence, ankyrin-G/GABARAP Co-IP, lithium and Tideglusib rescue\",\n      \"pmids\": [\"40849089\", \"37961630\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"GABARAP-binding interface structure not resolved\", \"How GSK3β inhibition reverses a binding-domain variant mechanistically unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed that a conserved microexon E35a, differentially spliced between glutamatergic and GABAergic neurons, links ankyrin-G to an InsP3R complex and intracellular Ca2+ signaling to set interneuron excitability independent of AIS structure, revealing isoform-encoded functional diversification.\",\n      \"evidence\": \"E35a-deletion CRISPR mouse, single-cell electrophysiology, two-photon Ca2+ imaging, AnkG-InsP3R Co-IP, splicing-factor knockdown\",\n      \"pmids\": [\"41688438\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct InsP3R-binding interface not mapped\", \"Whether E35a regulation operates in other neuron classes unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified a tumor-suppressive role for ANK3 in hepatocellular carcinoma via ankyrin-repeat-domain binding of E-cadherin that stabilizes it and restrains Wnt signaling, extending its scaffolding role to adhesion-coupled oncogenic pathways.\",\n      \"evidence\": \"shRNA knockdown and ANK3-TV4 overexpression in HCC cells, proliferation/invasion assays, Western blot, xenograft, ANK3-E-cadherin Co-IP\",\n      \"pmids\": [\"41198552\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, single cell context\", \"Mechanism by which ANK3 prevents E-cadherin degradation not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How distinct ANK3 isoforms and microexons are deployed across cell types to assemble partner-specific scaffolds — and how these molecular events translate into the divergent psychiatric, epilepsy, developmental, and oncogenic phenotypes — remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model of how each domain/exon selects its partner\", \"Mechanism connecting lithium/GSK3β rescue to ankyrin-G scaffolding not defined\", \"Causal link between specific risk isoforms and cellular pathology unestablished\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1, 7]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 13, 14]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 7]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [2, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 7]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 7]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0112316\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [3, 12, 14]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 13, 15]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 11]}\n    ],\n    \"complexes\": [\"axon initial segment\", \"node of Ranvier\"],\n    \"partners\": [\"SPTBN (β-spectrin)\", \"ATP1A (Na-K-ATPase)\", \"SCN5A (NaV1.5)\", \"GABARAP\", \"ITPR (InsP3R)\", \"CDH1 (E-cadherin)\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}