{"gene":"TAOK1","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2003,"finding":"MARKK (TAOK1) is a Ste20-like kinase that acts as an upstream activator of MARK/PAR-1 by phosphorylating MARK within its activation loop at T208 (in MARK2). This phosphorylation activates MARK, leading to downstream phosphorylation of microtubule-associated proteins (tau/MAP2/MAP4) at KXGS motifs, causing their detachment from microtubules and microtubule disassembly.","method":"In vitro kinase assay, phosphorylation site mapping, cell overexpression with readout of microtubule dynamics and tau phosphorylation","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro kinase assay with phosphorylation site identification, plus cellular validation of downstream signaling; foundational mechanistic paper","pmids":["14517247"],"is_preprint":false},{"year":2008,"finding":"MARKK/TAOK1 interacts with Spred1 and TESK1 via yeast two-hybrid and cellular assays. TESK1 binds to and inhibits MARKK/TAOK1, thereby blocking MARKK-mediated microtubule disruption. Spred1 binds MARKK without affecting its activity but inhibits TESK1, thus making F-actin fibers dynamic. This three-way interaction links regulation of both the microtubule and F-actin cytoskeleton.","method":"Yeast two-hybrid, co-immunoprecipitation, overexpression/knockdown in CHO cells with readout of microtubule and actin cytoskeletal organization","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal binding assays (yeast two-hybrid + Co-IP), functional cellular phenotypes with multiple interaction partners characterized","pmids":["18216281"],"is_preprint":false},{"year":2006,"finding":"PSK2 (TAOK1) activates JNK and induces apoptotic morphological changes (cell contraction, membrane blebbing, apoptotic body formation). PSK2 stimulates cleavage of ROCK-I, and both JNK and ROCK-I activities are required downstream of PSK2 to produce these apoptotic morphological responses. PSK2 is itself a substrate for caspase 3. Apoptotic stimuli increase endogenous PSK2 catalytic activity.","method":"Overexpression, dominant-negative JNK, pharmacological inhibitors, kinase activity assay, caspase substrate assay in cultured cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal approaches (dominant-negative, inhibitors, activity assays) in a single focused study establishing pathway placement","pmids":["16407310"],"is_preprint":false},{"year":2018,"finding":"TAOK1 functions as a negative regulator of IL-17-mediated signaling. TAOK1 interacts with IL-17 receptor A (IL-17RA) independently of its kinase activity, and dose-dependently prevents formation of the IL-17R–Act1 complex, thereby suppressing downstream MAPK and NF-κB activation. TAOK1 knockdown promotes IL-17-induced cytokine/chemokine expression, and TAOK1-deficient mice show exacerbated colitis in a TNBS model.","method":"Co-immunoprecipitation, siRNA knockdown, overexpression, TAOK1-deficient mouse model with inflammatory readout","journal":"Cellular & molecular immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP showing direct interaction with IL-17RA, kinase-dead mutant used to dissect kinase-independent mechanism, in vivo mouse model with phenotypic readout","pmids":["29400705"],"is_preprint":false},{"year":2020,"finding":"TAOK1 positively regulates TLR4-induced inflammatory responses in macrophages by constitutively interacting with TRAF6 and TPL2, promoting LPS-induced ERK1/2 activation and pro-inflammatory cytokine production. TAOK1-deficient mice show decreased susceptibility to endotoxin shock.","method":"Co-immunoprecipitation, siRNA knockdown, TAOK1-deficient mice with LPS/endotoxin shock model, cytokine measurement","journal":"Molecular immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — constitutive Co-IP with TRAF6/TPL2, in vivo knockout mouse model, ERK activation readout providing pathway placement","pmids":["32344244"],"is_preprint":false},{"year":2023,"finding":"TAOK1 functions as a plasma membrane remodeling kinase. It directly associates with phosphoinositides via a coiled-coil triple-helical region C-terminal to the kinase domain. Autophosphorylation of T440 and T443 in this triple-helical region by the kinase domain blocks plasma membrane association. NDD-associated TAOK1 mutants are catalytically inactive, aberrantly trapped in a membrane-bound state, and induce abnormal membrane protrusions and abnormal dendritic arbor growth in cultured mouse hippocampal neurons.","method":"Phosphoinositide binding assay, autophosphorylation assay, mutagenesis, expression in cultured mouse hippocampal neurons with morphological readout, in silico structural modeling","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct lipid-binding reconstitution, autophosphorylation mutagenesis, and neuronal morphology phenotype in a single rigorous study with multiple orthogonal methods","pmids":["36595571"],"is_preprint":false},{"year":2023,"finding":"TAOK1 controls antiviral innate immune responses by constitutively associating with TBK1 (independently of MAVS), promoting IRF3 activation by enhancing TBK1-IRF3 complex formation. Viral infection induces TAOK1 to switch binding from MAP4 to dynein, facilitating trafficking of TBK1 along microtubules to the perinuclear region where it binds IRF3. Microtubule depolymerization impairs virus-mediated IRF3 activation. TAOK1 promotes type I IFN production in a kinase activity-dependent manner.","method":"Co-immunoprecipitation, siRNA knockdown, kinase-dead mutant, microtubule depolymerization experiments, reporter assay for IFN production","journal":"Journal of innate immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — reciprocal Co-IP and kinase-dead mutant analysis in single lab; mechanistically detailed but not independently replicated","pmids":["36649698"],"is_preprint":false},{"year":2019,"finding":"Loss of TAOK1 in patient-derived fibroblasts results in undetectable phosphorylated TAO1 kinase and phosphorylated tau, and alters mitochondrial morphology. Knockdown of the Drosophila ortholog Tao1 causes altered ventral nerve cord and neuromuscular junction morphology, decreased synaptic bouton number, and altered mitochondrial distribution and size in motor neuron axons.","method":"Patient-derived fibroblast analysis (Western blot for phospho-tau/phospho-TAO1), Drosophila Tao1 RNAi knockdown with NMJ/mitochondria imaging","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function in both human cells and Drosophila model with defined cellular phenotypes, though mechanistic pathway placement is partial","pmids":["31230721"],"is_preprint":false},{"year":2021,"finding":"Altered TAOK1 expression levels in the embryonic mouse brain affect neural migration in vivo, and neuronal maturation in vitro. Missense variants can have loss-of-function or dominant-negative effects on TAOK1 activity.","method":"In utero electroporation for neural migration assay in mouse embryos, primary neuron cultures with TAOK1 manipulation","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo neural migration assay plus in vitro neuronal maturation assay with defined TAOK1 manipulation","pmids":["33565190"],"is_preprint":false},{"year":2023,"finding":"TAOK1 promotes the TAOK1/p38-MAPK/FoxO3 pathway in muscle to regulate protein degradation via the ubiquitin-proteasome system and autophagy. CYA was found to directly bind TAOK1 (biotin-streptavidin pull-down, microscale thermophoresis), inhibiting its activation and downstream p38-MAPK signaling, reducing FoxO3 nuclear localization, and ameliorating muscle atrophy in cancer cachexia.","method":"Biotin-streptavidin pull-down, microscale thermophoresis binding assay, siRNA knockdown, p38-MAPK pathway pharmacological activation/inhibition, Western blotting, C26 tumor-bearing mouse model","journal":"Journal of cachexia, sarcopenia and muscle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding confirmed by two orthogonal biochemical methods, pathway placement by siRNA and pharmacological rescue in vitro and in vivo","pmids":["37439183"],"is_preprint":false},{"year":2023,"finding":"TAOK1 haploinsufficiency in mice leads to autistic-like behaviors associated with reduced activation of dorsal raphe nucleus (DRN) neurons during social interactions. Genetic deletion of Taok1 specifically in VGlut3-positive DRN neurons recapitulates the social behavior deficit. Reintroduction of wild-type TAOK1, but not a kinase-dead variant, into the DRN of adult mice rescues the autistic-like behaviors, indicating that TAOK1's kinase activity is required for normal social behavior.","method":"Conditional knockout (VGlut3-Cre), AAV rescue with wild-type vs. kinase-dead TAOK1, in vivo calcium imaging of DRN neurons during social interaction, phosphoproteomics","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional cell-type-specific KO plus kinase-dead rescue distinguishing catalytic from non-catalytic function, with defined behavioral and neurophysiological phenotypes","pmids":["37656623"],"is_preprint":false},{"year":2023,"finding":"TAOK1 silencing in human hepatocytes inhibits ERK and JNK activation and represses acetyl-CoA carboxylase (ACC) protein abundance, and TAOK1 protein colocalizes with intracellular lipid droplets in human and mouse hepatocytes.","method":"siRNA knockdown, immunofluorescence microscopy for colocalization with lipid droplets, Western blotting for ERK/JNK/ACC, functional metabolic assays","journal":"Hepatology communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — single lab, direct subcellular localization by imaging plus knockdown/overexpression with pathway readouts, but no independent replication","pmids":["36930872"],"is_preprint":false},{"year":2025,"finding":"TAOK1 promotes homologous recombination (HR) repair by phosphorylating USP7, enhancing USP7 deubiquitylase activity and thereby preventing ubiquitylation and degradation of RAD51, which is required for RAD51 filament formation in HR repair. Genetic depletion or pharmacological inhibition of TAOK1 leads to RAD51 degradation, disrupted HR, and increased tumor cell sensitivity to PARP inhibitors.","method":"High-throughput kinase inhibitor screen, in vitro kinase assay (TAOK1 phosphorylates USP7), Co-IP, RAD51 ubiquitylation/degradation assay, HR repair reporter, PARP inhibitor sensitivity assay in human cancer cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct kinase assay demonstrating TAOK1 phosphorylates USP7, mechanistic dissection with substrate (RAD51), multiple orthogonal methods in single rigorous study","pmids":["40106350"],"is_preprint":false},{"year":2024,"finding":"TAOK1 interacts with STK3 (MST2) to phosphorylate it, activating the Hippo kinase cascade and leading to YAP1 phosphorylation and cytoplasmic retention. The lncRNA ELFN1-AS1 binds the kinase domain of TAOK1 and disrupts the TAOK1-STK3 interaction, reducing STK3 phosphorylation, decreasing YAP1 phosphorylation, and promoting YAP1 nuclear translocation and MYC expression.","method":"Co-immunoprecipitation, RNA pull-down (ELFN1-AS1 with TAOK1), phosphorylation assay for STK3, YAP1 localization by imaging, rescue experiments","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP interaction with STK3 and lncRNA-mediated disruption shown, mechanistic pathway placement via phosphorylation readouts, single lab","pmids":["39528458"],"is_preprint":false},{"year":2024,"finding":"TAOK1 interacts with CDC20 as shown by co-immunoprecipitation in human umbilical vein endothelial cells. TAOK1 overexpression counteracts ox-LDL-induced apoptosis, senescence, and pro-inflammatory signaling; these protective effects are reversed by CDC20 siRNA knockdown.","method":"Co-immunoprecipitation, siRNA knockdown of CDC20, overexpression, flow cytometry for apoptosis, β-galactosidase staining for senescence","journal":"Discovery medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP showing TAOK1-CDC20 interaction, functional rescue experiments but no deeper mechanistic dissection; single lab","pmids":["39726311"],"is_preprint":false},{"year":2025,"finding":"Schip1 interacts with Taok1 to activate the p38 MAPK signaling pathway, promoting osteoclast differentiation. Suppression of Schip1 reduces Rankl-induced osteoclast formation, and Schip1 genetic ablation in mice results in osteosclerosis and protection from ovariectomy-induced osteoporosis.","method":"Co-immunoprecipitation (Schip1-Taok1 interaction), siRNA knockdown, genetic ablation in mice, osteoclast differentiation assay, ovariectomy model","journal":"Bone","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP interaction, in vivo mouse genetic model with defined phenotype, pathway placement via p38 readout; single lab","pmids":["40633827"],"is_preprint":false},{"year":2025,"finding":"TAOK1 regulates replication fork (RF) stability in a kinase activity-independent manner. TAOK1 depletion stabilizes replication forks and reduces replication-associated DNA damage in BRCA1/2-deficient cells, conferring resistance to PARP inhibitors and ionizing radiation. TAOK1 interacts with PCNA and regulates ISG15 levels to affect RF stability.","method":"siRNA/genetic depletion, DNA fiber assay for RF stability, Co-IP with PCNA, ISG15 level measurement, PARP inhibitor and IR sensitivity assays in BRCA1/2-deficient cells","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — preprint; direct PCNA interaction by Co-IP, DNA fiber assay for RF dynamics, kinase-dead separation-of-function shown; single lab, not yet peer-reviewed","pmids":[],"is_preprint":true},{"year":2025,"finding":"TAOK1 MAPK signaling is activated downstream of GADD45B (a DNA demethylation sensor). Betulin increases DNA methylation at the TAOK1 promoter and decreases TAOK1 expression, attenuating p38 MAPK activation and reducing apoptosis in intestinal epithelial cells during sepsis. Overexpression of GADD45B or TAOK1 reversed the anti-apoptotic effect of betulin.","method":"qMSP (methylation-specific PCR), Western blotting, overexpression rescue, CLP mouse model, LPS-induced IEC-6 cell model","journal":"Journal of ethnopharmacology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pathway epistasis inferred from overexpression rescue; GADD45B-TAOK1 link relies on indirect methylation and expression data, single lab","pmids":["40653040"],"is_preprint":false}],"current_model":"TAOK1 (also known as MARKK, PSK2) is a Ste20-like serine/threonine kinase that acts upstream of multiple MAP kinase cascades: it activates MARK/PAR-1 by phosphorylating its activation loop (T208), thereby triggering microtubule-associated protein (tau/MAP2/MAP4) detachment and microtubule disassembly; it is inhibited by binding partner TESK1 and connected to actin cytoskeleton regulation via Spred1; it promotes apoptotic morphology through JNK and ROCK-I; it negatively regulates IL-17 signaling by blocking IL-17RA–Act1 complex formation independent of its kinase activity; it positively regulates TLR4-driven inflammation by scaffolding TRAF6–TPL2 to activate ERK1/2; it promotes antiviral type I IFN production by trafficking TBK1 along microtubules to bind IRF3; in neurons it remodels the plasma membrane through direct phosphoinositide binding regulated by autophosphorylation of T440/T443, and its kinase activity is required for normal social behavior via the dorsal raphe nucleus; and in the nucleus it promotes homologous recombination repair by phosphorylating USP7 to stabilize RAD51."},"narrative":{"mechanistic_narrative":"TAOK1 (MARKK/PSK2) is a Ste20-like serine/threonine kinase that operates as an upstream node integrating cytoskeletal dynamics, MAP kinase signaling, innate immunity, and genome maintenance [PMID:14517247, PMID:16407310]. Its founding biochemical activity is phosphorylation of the MARK/PAR-1 activation loop (T208), which drives MARK-mediated phosphorylation of microtubule-associated proteins (tau/MAP2/MAP4) at KXGS motifs and consequent microtubule disassembly [PMID:14517247]; this microtubule-regulatory activity is constrained by TESK1 binding, with Spred1 coupling the system to F-actin dynamics [PMID:18216281]. Through downstream activation of JNK and cleavage of ROCK-I, TAOK1 drives apoptotic morphological change and is itself a caspase-3 substrate [PMID:16407310]. In neurons, TAOK1 directly binds phosphoinositides through a coiled-coil triple-helical region C-terminal to the kinase domain, an association switched off by autophosphorylation at T440/T443; disease-associated catalytically inactive mutants are trapped on the membrane and produce aberrant membrane protrusions and dendritic arbor defects [PMID:36595571], and TAOK1 dosage and activity govern neural migration, neuronal maturation, and—via the dorsal raphe nucleus—social behavior [PMID:33565190, PMID:37656623]. In immune signaling TAOK1 acts bidirectionally: it suppresses IL-17 signaling kinase-independently by blocking IL-17RA–Act1 complex assembly [PMID:29400705], yet scaffolds TRAF6–TPL2 to promote TLR4-driven ERK1/2 activation and inflammation [PMID:32344244] and traffics TBK1 along microtubules to IRF3 to support type I IFN production [PMID:36649698]. In the nucleus TAOK1 promotes homologous recombination by phosphorylating USP7 to stabilize RAD51, and its loss sensitizes tumor cells to PARP inhibitors [PMID:40106350]. Loss-of-function and dominant-negative TAOK1 variants underlie a neurodevelopmental disorder, consistent with its roles in neuronal morphogenesis and behavior [PMID:31230721, PMID:33565190].","teleology":[{"year":2003,"claim":"Established TAOK1's foundational catalytic activity by identifying it as the kinase that activates MARK/PAR-1, explaining how an upstream signal controls microtubule-associated protein detachment.","evidence":"In vitro kinase assay with phosphosite mapping (T208 of MARK2) plus cellular readout of tau phosphorylation and microtubule dynamics","pmids":["14517247"],"confidence":"High","gaps":["Did not define upstream activators of TAOK1 itself","Physiological contexts of MARK activation not addressed"]},{"year":2006,"claim":"Placed TAOK1 in an apoptotic signaling axis, showing it drives apoptotic morphology through JNK and ROCK-I and is itself regulated by caspase cleavage.","evidence":"Overexpression, dominant-negative JNK, pharmacological inhibitors and caspase substrate assays in cultured cells","pmids":["16407310"],"confidence":"High","gaps":["Direct substrates linking TAOK1 to JNK activation not identified","Whether caspase cleavage is activating or inactivating unresolved"]},{"year":2008,"claim":"Defined regulatory inputs to TAOK1, showing TESK1 binds and inhibits it while Spred1 links its control to F-actin, integrating microtubule and actin cytoskeleton regulation.","evidence":"Yeast two-hybrid, Co-IP and overexpression/knockdown in CHO cells with cytoskeletal readouts","pmids":["18216281"],"confidence":"High","gaps":["Mechanism by which TESK1 inhibits kinase activity not structurally defined","Physiological stimulus controlling this switch unknown"]},{"year":2018,"claim":"Revealed a kinase-independent scaffolding function, showing TAOK1 suppresses IL-17 signaling by blocking IL-17RA–Act1 complex formation.","evidence":"Co-IP, siRNA, kinase-dead mutant and TAOK1-deficient mouse colitis model","pmids":["29400705"],"confidence":"High","gaps":["Structural basis of IL-17RA binding not determined","How kinase-dependent and -independent functions are partitioned unclear"]},{"year":2019,"claim":"Connected TAOK1 loss to a defined cellular and neuronal phenotype, supporting its role in a neurodevelopmental disorder.","evidence":"Patient fibroblast phospho-tau/phospho-TAO1 Western blots and Drosophila Tao1 RNAi with NMJ/mitochondria imaging","pmids":["31230721"],"confidence":"Medium","gaps":["Mechanism linking TAOK1 to mitochondrial morphology not established","Pathway placement of neuronal phenotype partial"]},{"year":2020,"claim":"Showed a context-opposite immune role, with TAOK1 scaffolding TRAF6–TPL2 to promote TLR4/ERK-driven inflammation.","evidence":"Constitutive Co-IP, siRNA and TAOK1-deficient mouse endotoxin shock model","pmids":["32344244"],"confidence":"High","gaps":["Whether TAOK1 kinase activity is required not dissected","Relationship to its IL-17-suppressive role unexplained"]},{"year":2021,"claim":"Demonstrated dosage-sensitivity of TAOK1 in brain development and that disease variants act by loss-of-function or dominant-negative mechanisms.","evidence":"In utero electroporation neural migration assay and primary neuron maturation assays with TAOK1 manipulation","pmids":["33565190"],"confidence":"Medium","gaps":["Molecular substrates in migrating neurons not identified","Distinction between LOF and dominant-negative variant mechanisms incomplete"]},{"year":2023,"claim":"Defined a direct membrane-remodeling mechanism, showing TAOK1 binds phosphoinositides via a triple-helical region switched off by T440/T443 autophosphorylation, and that disease mutants are catalytically dead and membrane-trapped.","evidence":"Phosphoinositide binding and autophosphorylation assays, mutagenesis and morphology in mouse hippocampal neurons with structural modeling","pmids":["36595571"],"confidence":"High","gaps":["In vivo physiological membrane substrates not mapped","Crystal/cryo-EM structure of the membrane-bound state lacking"]},{"year":2023,"claim":"Established a kinase-dependent antiviral role, showing TAOK1 traffics TBK1 along microtubules to IRF3 to promote type I IFN.","evidence":"Reciprocal Co-IP, kinase-dead mutant, microtubule depolymerization and IFN reporter assays","pmids":["36649698"],"confidence":"Medium","gaps":["TBK1/dynein trafficking switch not independently replicated","Phosphorylation target driving IRF3 activation not identified"]},{"year":2023,"claim":"Linked TAOK1 kinase activity to social behavior through dorsal raphe nucleus neurons, providing in vivo causal evidence for autism-like phenotypes.","evidence":"VGlut3-Cre conditional knockout, AAV rescue with WT vs kinase-dead TAOK1, in vivo calcium imaging and phosphoproteomics","pmids":["37656623"],"confidence":"High","gaps":["Behaviorally relevant phosphorylation substrates in DRN neurons not pinpointed","Circuit downstream of DRN not mapped"]},{"year":2023,"claim":"Extended TAOK1 to metabolic regulation, implicating TAOK1/p38-MAPK/FoxO3 signaling in muscle protein degradation and cachexia, and lipid-droplet-associated ERK/JNK signaling in hepatocytes.","evidence":"Direct binding (pull-down, microscale thermophoresis), siRNA, pathway inhibition, tumor-bearing mouse model; and hepatocyte siRNA with lipid-droplet colocalization imaging","pmids":["37439183","36930872"],"confidence":"Medium","gaps":["Direct phosphorylation substrates in p38/FoxO3 axis not defined","Hepatocyte lipid-droplet role single-lab without replication"]},{"year":2024,"claim":"Placed TAOK1 upstream of the Hippo pathway via STK3/MST2 phosphorylation, with an lncRNA-mediated disruption mechanism affecting YAP1 localization.","evidence":"Co-IP, RNA pull-down, STK3 phosphorylation assays and YAP1 localization imaging","pmids":["39528458"],"confidence":"Medium","gaps":["Direct STK3 phosphosite not mapped","Physiological relevance beyond cancer context unknown"]},{"year":2025,"claim":"Identified a nuclear genome-maintenance role, showing TAOK1 phosphorylates USP7 to stabilize RAD51 and enable homologous recombination, with therapeutic relevance to PARP inhibitor sensitivity.","evidence":"Kinase inhibitor screen, in vitro kinase assay, Co-IP, RAD51 ubiquitylation/degradation and HR reporter assays in cancer cells","pmids":["40106350"],"confidence":"High","gaps":["USP7 phosphosite and how it enhances DUB activity not fully defined","How TAOK1 is recruited to sites of HR repair unknown"]},{"year":2025,"claim":"Revealed a kinase-independent role at replication forks, where TAOK1 depletion stabilizes forks and confers PARP inhibitor/IR resistance in BRCA-deficient cells.","evidence":"siRNA/genetic depletion, DNA fiber assays, PCNA Co-IP and ISG15 measurement in BRCA1/2-deficient cells (preprint)","pmids":[],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed","Apparent opposition to the HR-promoting role at forks not reconciled"]},{"year":null,"claim":"How TAOK1's catalytic versus scaffolding modes are switched across its many contexts—and what upstream signals select among cytoskeletal, immune, metabolic, behavioral, and DNA-repair functions—remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unifying model for context-specific substrate selection","Upstream activators of TAOK1 across pathways largely uncharacterized","Reconciliation of opposing pro- and anti-inflammatory and pro- and anti-fork-stability roles lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,12,13]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,5,12]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[5]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[4,6]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[5]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,6]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[12]},{"term_id":"GO:0005811","term_label":"lipid droplet","supporting_discovery_ids":[11]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,2,13]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[3,4,6]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[12]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5,8,10]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[2]}],"complexes":[],"partners":["MARK2","TESK1","SPRED1","TRAF6","TPL2","TBK1","USP7","STK3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q7L7X3","full_name":"Serine/threonine-protein kinase TAO1","aliases":["Kinase from chicken homolog B","hKFC-B","MARK Kinase","MARKK","Prostate-derived sterile 20-like kinase 2","PSK-2","PSK2","Prostate-derived STE20-like kinase 2","Thousand and one amino acid protein kinase 1","TAOK1","hTAOK1"],"length_aa":1001,"mass_kda":116.1,"function":"Serine/threonine-protein kinase involved in various processes such as p38/MAPK14 stress-activated MAPK cascade, DNA damage response and regulation of cytoskeleton stability. Phosphorylates MAP2K3, MAP2K6 and MARK2. Acts as an activator of the p38/MAPK14 stress-activated MAPK cascade by mediating phosphorylation and subsequent activation of the upstream MAP2K3 and MAP2K6 kinases. Involved in G-protein coupled receptor signaling to p38/MAPK14. In response to DNA damage, involved in the G2/M transition DNA damage checkpoint by activating the p38/MAPK14 stress-activated MAPK cascade, probably by mediating phosphorylation of MAP2K3 and MAP2K6. Acts as a regulator of cytoskeleton stability by phosphorylating 'Thr-208' of MARK2, leading to activate MARK2 kinase activity and subsequent phosphorylation and detachment of MAPT/TAU from microtubules. Also acts as a regulator of apoptosis: regulates apoptotic morphological changes, including cell contraction, membrane blebbing and apoptotic bodies formation via activation of the MAPK8/JNK cascade. Plays an essential role in the regulation of neuronal development in the central nervous system (PubMed:33565190). Also plays a role in the regulation of neuronal migration to the cortical plate (By similarity)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q7L7X3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TAOK1","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000160551","cell_line_id":"CID001287","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"big_aggregates","grade":1}],"interactors":[{"gene":"LDHA","stoichiometry":0.2},{"gene":"RASSF2","stoichiometry":0.2},{"gene":"S100A7","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001287","total_profiled":1310},"omim":[{"mim_id":"619575","title":"DEVELOPMENTAL DELAY WITH OR WITHOUT INTELLECTUAL IMPAIRMENT OR BEHAVIORAL ABNORMALITIES; DDIB","url":"https://www.omim.org/entry/619575"},{"mim_id":"616711","title":"TAO KINASE 3; TAOK3","url":"https://www.omim.org/entry/616711"},{"mim_id":"613199","title":"TAO KINASE 2; TAOK2","url":"https://www.omim.org/entry/613199"},{"mim_id":"612575","title":"MEAN PLATELET VOLUME/COUNT QUANTITATIVE TRAIT LOCUS 3; MPVCQTL3","url":"https://www.omim.org/entry/612575"},{"mim_id":"610266","title":"TAO KINASE 1; TAOK1","url":"https://www.omim.org/entry/610266"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"},{"location":"Vesicles","reliability":"Additional"},{"location":"Primary cilium","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TAOK1"},"hgnc":{"alias_symbol":["KIAA1361","MARKK","PSK2","MAP3K16","FLJ14314","TAO1","hTAOK1","hKFC-B"],"prev_symbol":[]},"alphafold":{"accession":"Q7L7X3","domains":[{"cath_id":"3.30.200.20","chopping":"13-107","consensus_level":"medium","plddt":91.6309,"start":13,"end":107},{"cath_id":"1.10.510.10","chopping":"109-314_438-442","consensus_level":"medium","plddt":91.6628,"start":109,"end":442},{"cath_id":"-","chopping":"474-574_588-884","consensus_level":"medium","plddt":93.2189,"start":474,"end":884}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q7L7X3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q7L7X3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q7L7X3-F1-predicted_aligned_error_v6.png","plddt_mean":76.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TAOK1","jax_strain_url":"https://www.jax.org/strain/search?query=TAOK1"},"sequence":{"accession":"Q7L7X3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q7L7X3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q7L7X3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q7L7X3"}},"corpus_meta":[{"pmid":"14517247","id":"PMC_14517247","title":"MARKK, 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ameliorates muscle atrophy by inhibiting TAOK1/p38-MAPK/FoxO3 pathway in cancer cachexia.","date":"2023","source":"Journal of cachexia, sarcopenia and muscle","url":"https://pubmed.ncbi.nlm.nih.gov/37439183","citation_count":20,"is_preprint":false},{"pmid":"35091509","id":"PMC_35091509","title":"Inherited and de novo variants extend the etiology of TAOK1-associated neurodevelopmental disorder.","date":"2022","source":"Cold Spring Harbor molecular case studies","url":"https://pubmed.ncbi.nlm.nih.gov/35091509","citation_count":16,"is_preprint":false},{"pmid":"33167727","id":"PMC_33167727","title":"Identification of a dual TAOK1 and MAP4K5 inhibitor using a structure-based virtual screening approach.","date":"2021","source":"Journal of enzyme inhibition and medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/33167727","citation_count":16,"is_preprint":false},{"pmid":"36595571","id":"PMC_36595571","title":"Neurodevelopmental disorder-associated mutations in TAOK1 reveal its 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This phosphorylation activates MARK, leading to downstream phosphorylation of microtubule-associated proteins (tau/MAP2/MAP4) at KXGS motifs, causing their detachment from microtubules and microtubule disassembly.\",\n      \"method\": \"In vitro kinase assay, phosphorylation site mapping, cell overexpression with readout of microtubule dynamics and tau phosphorylation\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro kinase assay with phosphorylation site identification, plus cellular validation of downstream signaling; foundational mechanistic paper\",\n      \"pmids\": [\"14517247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"MARKK/TAOK1 interacts with Spred1 and TESK1 via yeast two-hybrid and cellular assays. TESK1 binds to and inhibits MARKK/TAOK1, thereby blocking MARKK-mediated microtubule disruption. Spred1 binds MARKK without affecting its activity but inhibits TESK1, thus making F-actin fibers dynamic. This three-way interaction links regulation of both the microtubule and F-actin cytoskeleton.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, overexpression/knockdown in CHO cells with readout of microtubule and actin cytoskeletal organization\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding assays (yeast two-hybrid + Co-IP), functional cellular phenotypes with multiple interaction partners characterized\",\n      \"pmids\": [\"18216281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PSK2 (TAOK1) activates JNK and induces apoptotic morphological changes (cell contraction, membrane blebbing, apoptotic body formation). PSK2 stimulates cleavage of ROCK-I, and both JNK and ROCK-I activities are required downstream of PSK2 to produce these apoptotic morphological responses. PSK2 is itself a substrate for caspase 3. Apoptotic stimuli increase endogenous PSK2 catalytic activity.\",\n      \"method\": \"Overexpression, dominant-negative JNK, pharmacological inhibitors, kinase activity assay, caspase substrate assay in cultured cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal approaches (dominant-negative, inhibitors, activity assays) in a single focused study establishing pathway placement\",\n      \"pmids\": [\"16407310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TAOK1 functions as a negative regulator of IL-17-mediated signaling. TAOK1 interacts with IL-17 receptor A (IL-17RA) independently of its kinase activity, and dose-dependently prevents formation of the IL-17R–Act1 complex, thereby suppressing downstream MAPK and NF-κB activation. TAOK1 knockdown promotes IL-17-induced cytokine/chemokine expression, and TAOK1-deficient mice show exacerbated colitis in a TNBS model.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, overexpression, TAOK1-deficient mouse model with inflammatory readout\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP showing direct interaction with IL-17RA, kinase-dead mutant used to dissect kinase-independent mechanism, in vivo mouse model with phenotypic readout\",\n      \"pmids\": [\"29400705\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TAOK1 positively regulates TLR4-induced inflammatory responses in macrophages by constitutively interacting with TRAF6 and TPL2, promoting LPS-induced ERK1/2 activation and pro-inflammatory cytokine production. TAOK1-deficient mice show decreased susceptibility to endotoxin shock.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, TAOK1-deficient mice with LPS/endotoxin shock model, cytokine measurement\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — constitutive Co-IP with TRAF6/TPL2, in vivo knockout mouse model, ERK activation readout providing pathway placement\",\n      \"pmids\": [\"32344244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TAOK1 functions as a plasma membrane remodeling kinase. It directly associates with phosphoinositides via a coiled-coil triple-helical region C-terminal to the kinase domain. Autophosphorylation of T440 and T443 in this triple-helical region by the kinase domain blocks plasma membrane association. NDD-associated TAOK1 mutants are catalytically inactive, aberrantly trapped in a membrane-bound state, and induce abnormal membrane protrusions and abnormal dendritic arbor growth in cultured mouse hippocampal neurons.\",\n      \"method\": \"Phosphoinositide binding assay, autophosphorylation assay, mutagenesis, expression in cultured mouse hippocampal neurons with morphological readout, in silico structural modeling\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct lipid-binding reconstitution, autophosphorylation mutagenesis, and neuronal morphology phenotype in a single rigorous study with multiple orthogonal methods\",\n      \"pmids\": [\"36595571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TAOK1 controls antiviral innate immune responses by constitutively associating with TBK1 (independently of MAVS), promoting IRF3 activation by enhancing TBK1-IRF3 complex formation. Viral infection induces TAOK1 to switch binding from MAP4 to dynein, facilitating trafficking of TBK1 along microtubules to the perinuclear region where it binds IRF3. Microtubule depolymerization impairs virus-mediated IRF3 activation. TAOK1 promotes type I IFN production in a kinase activity-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, kinase-dead mutant, microtubule depolymerization experiments, reporter assay for IFN production\",\n      \"journal\": \"Journal of innate immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — reciprocal Co-IP and kinase-dead mutant analysis in single lab; mechanistically detailed but not independently replicated\",\n      \"pmids\": [\"36649698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Loss of TAOK1 in patient-derived fibroblasts results in undetectable phosphorylated TAO1 kinase and phosphorylated tau, and alters mitochondrial morphology. Knockdown of the Drosophila ortholog Tao1 causes altered ventral nerve cord and neuromuscular junction morphology, decreased synaptic bouton number, and altered mitochondrial distribution and size in motor neuron axons.\",\n      \"method\": \"Patient-derived fibroblast analysis (Western blot for phospho-tau/phospho-TAO1), Drosophila Tao1 RNAi knockdown with NMJ/mitochondria imaging\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function in both human cells and Drosophila model with defined cellular phenotypes, though mechanistic pathway placement is partial\",\n      \"pmids\": [\"31230721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Altered TAOK1 expression levels in the embryonic mouse brain affect neural migration in vivo, and neuronal maturation in vitro. Missense variants can have loss-of-function or dominant-negative effects on TAOK1 activity.\",\n      \"method\": \"In utero electroporation for neural migration assay in mouse embryos, primary neuron cultures with TAOK1 manipulation\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo neural migration assay plus in vitro neuronal maturation assay with defined TAOK1 manipulation\",\n      \"pmids\": [\"33565190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TAOK1 promotes the TAOK1/p38-MAPK/FoxO3 pathway in muscle to regulate protein degradation via the ubiquitin-proteasome system and autophagy. CYA was found to directly bind TAOK1 (biotin-streptavidin pull-down, microscale thermophoresis), inhibiting its activation and downstream p38-MAPK signaling, reducing FoxO3 nuclear localization, and ameliorating muscle atrophy in cancer cachexia.\",\n      \"method\": \"Biotin-streptavidin pull-down, microscale thermophoresis binding assay, siRNA knockdown, p38-MAPK pathway pharmacological activation/inhibition, Western blotting, C26 tumor-bearing mouse model\",\n      \"journal\": \"Journal of cachexia, sarcopenia and muscle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding confirmed by two orthogonal biochemical methods, pathway placement by siRNA and pharmacological rescue in vitro and in vivo\",\n      \"pmids\": [\"37439183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TAOK1 haploinsufficiency in mice leads to autistic-like behaviors associated with reduced activation of dorsal raphe nucleus (DRN) neurons during social interactions. Genetic deletion of Taok1 specifically in VGlut3-positive DRN neurons recapitulates the social behavior deficit. Reintroduction of wild-type TAOK1, but not a kinase-dead variant, into the DRN of adult mice rescues the autistic-like behaviors, indicating that TAOK1's kinase activity is required for normal social behavior.\",\n      \"method\": \"Conditional knockout (VGlut3-Cre), AAV rescue with wild-type vs. kinase-dead TAOK1, in vivo calcium imaging of DRN neurons during social interaction, phosphoproteomics\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional cell-type-specific KO plus kinase-dead rescue distinguishing catalytic from non-catalytic function, with defined behavioral and neurophysiological phenotypes\",\n      \"pmids\": [\"37656623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TAOK1 silencing in human hepatocytes inhibits ERK and JNK activation and represses acetyl-CoA carboxylase (ACC) protein abundance, and TAOK1 protein colocalizes with intracellular lipid droplets in human and mouse hepatocytes.\",\n      \"method\": \"siRNA knockdown, immunofluorescence microscopy for colocalization with lipid droplets, Western blotting for ERK/JNK/ACC, functional metabolic assays\",\n      \"journal\": \"Hepatology communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — single lab, direct subcellular localization by imaging plus knockdown/overexpression with pathway readouts, but no independent replication\",\n      \"pmids\": [\"36930872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TAOK1 promotes homologous recombination (HR) repair by phosphorylating USP7, enhancing USP7 deubiquitylase activity and thereby preventing ubiquitylation and degradation of RAD51, which is required for RAD51 filament formation in HR repair. Genetic depletion or pharmacological inhibition of TAOK1 leads to RAD51 degradation, disrupted HR, and increased tumor cell sensitivity to PARP inhibitors.\",\n      \"method\": \"High-throughput kinase inhibitor screen, in vitro kinase assay (TAOK1 phosphorylates USP7), Co-IP, RAD51 ubiquitylation/degradation assay, HR repair reporter, PARP inhibitor sensitivity assay in human cancer cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct kinase assay demonstrating TAOK1 phosphorylates USP7, mechanistic dissection with substrate (RAD51), multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"40106350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TAOK1 interacts with STK3 (MST2) to phosphorylate it, activating the Hippo kinase cascade and leading to YAP1 phosphorylation and cytoplasmic retention. The lncRNA ELFN1-AS1 binds the kinase domain of TAOK1 and disrupts the TAOK1-STK3 interaction, reducing STK3 phosphorylation, decreasing YAP1 phosphorylation, and promoting YAP1 nuclear translocation and MYC expression.\",\n      \"method\": \"Co-immunoprecipitation, RNA pull-down (ELFN1-AS1 with TAOK1), phosphorylation assay for STK3, YAP1 localization by imaging, rescue experiments\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP interaction with STK3 and lncRNA-mediated disruption shown, mechanistic pathway placement via phosphorylation readouts, single lab\",\n      \"pmids\": [\"39528458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TAOK1 interacts with CDC20 as shown by co-immunoprecipitation in human umbilical vein endothelial cells. TAOK1 overexpression counteracts ox-LDL-induced apoptosis, senescence, and pro-inflammatory signaling; these protective effects are reversed by CDC20 siRNA knockdown.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown of CDC20, overexpression, flow cytometry for apoptosis, β-galactosidase staining for senescence\",\n      \"journal\": \"Discovery medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP showing TAOK1-CDC20 interaction, functional rescue experiments but no deeper mechanistic dissection; single lab\",\n      \"pmids\": [\"39726311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Schip1 interacts with Taok1 to activate the p38 MAPK signaling pathway, promoting osteoclast differentiation. Suppression of Schip1 reduces Rankl-induced osteoclast formation, and Schip1 genetic ablation in mice results in osteosclerosis and protection from ovariectomy-induced osteoporosis.\",\n      \"method\": \"Co-immunoprecipitation (Schip1-Taok1 interaction), siRNA knockdown, genetic ablation in mice, osteoclast differentiation assay, ovariectomy model\",\n      \"journal\": \"Bone\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP interaction, in vivo mouse genetic model with defined phenotype, pathway placement via p38 readout; single lab\",\n      \"pmids\": [\"40633827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TAOK1 regulates replication fork (RF) stability in a kinase activity-independent manner. TAOK1 depletion stabilizes replication forks and reduces replication-associated DNA damage in BRCA1/2-deficient cells, conferring resistance to PARP inhibitors and ionizing radiation. TAOK1 interacts with PCNA and regulates ISG15 levels to affect RF stability.\",\n      \"method\": \"siRNA/genetic depletion, DNA fiber assay for RF stability, Co-IP with PCNA, ISG15 level measurement, PARP inhibitor and IR sensitivity assays in BRCA1/2-deficient cells\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — preprint; direct PCNA interaction by Co-IP, DNA fiber assay for RF dynamics, kinase-dead separation-of-function shown; single lab, not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TAOK1 MAPK signaling is activated downstream of GADD45B (a DNA demethylation sensor). Betulin increases DNA methylation at the TAOK1 promoter and decreases TAOK1 expression, attenuating p38 MAPK activation and reducing apoptosis in intestinal epithelial cells during sepsis. Overexpression of GADD45B or TAOK1 reversed the anti-apoptotic effect of betulin.\",\n      \"method\": \"qMSP (methylation-specific PCR), Western blotting, overexpression rescue, CLP mouse model, LPS-induced IEC-6 cell model\",\n      \"journal\": \"Journal of ethnopharmacology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pathway epistasis inferred from overexpression rescue; GADD45B-TAOK1 link relies on indirect methylation and expression data, single lab\",\n      \"pmids\": [\"40653040\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TAOK1 (also known as MARKK, PSK2) is a Ste20-like serine/threonine kinase that acts upstream of multiple MAP kinase cascades: it activates MARK/PAR-1 by phosphorylating its activation loop (T208), thereby triggering microtubule-associated protein (tau/MAP2/MAP4) detachment and microtubule disassembly; it is inhibited by binding partner TESK1 and connected to actin cytoskeleton regulation via Spred1; it promotes apoptotic morphology through JNK and ROCK-I; it negatively regulates IL-17 signaling by blocking IL-17RA–Act1 complex formation independent of its kinase activity; it positively regulates TLR4-driven inflammation by scaffolding TRAF6–TPL2 to activate ERK1/2; it promotes antiviral type I IFN production by trafficking TBK1 along microtubules to bind IRF3; in neurons it remodels the plasma membrane through direct phosphoinositide binding regulated by autophosphorylation of T440/T443, and its kinase activity is required for normal social behavior via the dorsal raphe nucleus; and in the nucleus it promotes homologous recombination repair by phosphorylating USP7 to stabilize RAD51.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TAOK1 (MARKK/PSK2) is a Ste20-like serine/threonine kinase that operates as an upstream node integrating cytoskeletal dynamics, MAP kinase signaling, innate immunity, and genome maintenance [#0, #2]. Its founding biochemical activity is phosphorylation of the MARK/PAR-1 activation loop (T208), which drives MARK-mediated phosphorylation of microtubule-associated proteins (tau/MAP2/MAP4) at KXGS motifs and consequent microtubule disassembly [#0]; this microtubule-regulatory activity is constrained by TESK1 binding, with Spred1 coupling the system to F-actin dynamics [#1]. Through downstream activation of JNK and cleavage of ROCK-I, TAOK1 drives apoptotic morphological change and is itself a caspase-3 substrate [#2]. In neurons, TAOK1 directly binds phosphoinositides through a coiled-coil triple-helical region C-terminal to the kinase domain, an association switched off by autophosphorylation at T440/T443; disease-associated catalytically inactive mutants are trapped on the membrane and produce aberrant membrane protrusions and dendritic arbor defects [#5], and TAOK1 dosage and activity govern neural migration, neuronal maturation, and—via the dorsal raphe nucleus—social behavior [#8, #10]. In immune signaling TAOK1 acts bidirectionally: it suppresses IL-17 signaling kinase-independently by blocking IL-17RA–Act1 complex assembly [#3], yet scaffolds TRAF6–TPL2 to promote TLR4-driven ERK1/2 activation and inflammation [#4] and traffics TBK1 along microtubules to IRF3 to support type I IFN production [#6]. In the nucleus TAOK1 promotes homologous recombination by phosphorylating USP7 to stabilize RAD51, and its loss sensitizes tumor cells to PARP inhibitors [#12]. Loss-of-function and dominant-negative TAOK1 variants underlie a neurodevelopmental disorder, consistent with its roles in neuronal morphogenesis and behavior [#7, #8].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established TAOK1's foundational catalytic activity by identifying it as the kinase that activates MARK/PAR-1, explaining how an upstream signal controls microtubule-associated protein detachment.\",\n      \"evidence\": \"In vitro kinase assay with phosphosite mapping (T208 of MARK2) plus cellular readout of tau phosphorylation and microtubule dynamics\",\n      \"pmids\": [\"14517247\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define upstream activators of TAOK1 itself\", \"Physiological contexts of MARK activation not addressed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Placed TAOK1 in an apoptotic signaling axis, showing it drives apoptotic morphology through JNK and ROCK-I and is itself regulated by caspase cleavage.\",\n      \"evidence\": \"Overexpression, dominant-negative JNK, pharmacological inhibitors and caspase substrate assays in cultured cells\",\n      \"pmids\": [\"16407310\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct substrates linking TAOK1 to JNK activation not identified\", \"Whether caspase cleavage is activating or inactivating unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined regulatory inputs to TAOK1, showing TESK1 binds and inhibits it while Spred1 links its control to F-actin, integrating microtubule and actin cytoskeleton regulation.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP and overexpression/knockdown in CHO cells with cytoskeletal readouts\",\n      \"pmids\": [\"18216281\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which TESK1 inhibits kinase activity not structurally defined\", \"Physiological stimulus controlling this switch unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealed a kinase-independent scaffolding function, showing TAOK1 suppresses IL-17 signaling by blocking IL-17RA–Act1 complex formation.\",\n      \"evidence\": \"Co-IP, siRNA, kinase-dead mutant and TAOK1-deficient mouse colitis model\",\n      \"pmids\": [\"29400705\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of IL-17RA binding not determined\", \"How kinase-dependent and -independent functions are partitioned unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Connected TAOK1 loss to a defined cellular and neuronal phenotype, supporting its role in a neurodevelopmental disorder.\",\n      \"evidence\": \"Patient fibroblast phospho-tau/phospho-TAO1 Western blots and Drosophila Tao1 RNAi with NMJ/mitochondria imaging\",\n      \"pmids\": [\"31230721\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking TAOK1 to mitochondrial morphology not established\", \"Pathway placement of neuronal phenotype partial\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed a context-opposite immune role, with TAOK1 scaffolding TRAF6–TPL2 to promote TLR4/ERK-driven inflammation.\",\n      \"evidence\": \"Constitutive Co-IP, siRNA and TAOK1-deficient mouse endotoxin shock model\",\n      \"pmids\": [\"32344244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TAOK1 kinase activity is required not dissected\", \"Relationship to its IL-17-suppressive role unexplained\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated dosage-sensitivity of TAOK1 in brain development and that disease variants act by loss-of-function or dominant-negative mechanisms.\",\n      \"evidence\": \"In utero electroporation neural migration assay and primary neuron maturation assays with TAOK1 manipulation\",\n      \"pmids\": [\"33565190\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular substrates in migrating neurons not identified\", \"Distinction between LOF and dominant-negative variant mechanisms incomplete\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined a direct membrane-remodeling mechanism, showing TAOK1 binds phosphoinositides via a triple-helical region switched off by T440/T443 autophosphorylation, and that disease mutants are catalytically dead and membrane-trapped.\",\n      \"evidence\": \"Phosphoinositide binding and autophosphorylation assays, mutagenesis and morphology in mouse hippocampal neurons with structural modeling\",\n      \"pmids\": [\"36595571\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo physiological membrane substrates not mapped\", \"Crystal/cryo-EM structure of the membrane-bound state lacking\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established a kinase-dependent antiviral role, showing TAOK1 traffics TBK1 along microtubules to IRF3 to promote type I IFN.\",\n      \"evidence\": \"Reciprocal Co-IP, kinase-dead mutant, microtubule depolymerization and IFN reporter assays\",\n      \"pmids\": [\"36649698\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"TBK1/dynein trafficking switch not independently replicated\", \"Phosphorylation target driving IRF3 activation not identified\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked TAOK1 kinase activity to social behavior through dorsal raphe nucleus neurons, providing in vivo causal evidence for autism-like phenotypes.\",\n      \"evidence\": \"VGlut3-Cre conditional knockout, AAV rescue with WT vs kinase-dead TAOK1, in vivo calcium imaging and phosphoproteomics\",\n      \"pmids\": [\"37656623\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Behaviorally relevant phosphorylation substrates in DRN neurons not pinpointed\", \"Circuit downstream of DRN not mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extended TAOK1 to metabolic regulation, implicating TAOK1/p38-MAPK/FoxO3 signaling in muscle protein degradation and cachexia, and lipid-droplet-associated ERK/JNK signaling in hepatocytes.\",\n      \"evidence\": \"Direct binding (pull-down, microscale thermophoresis), siRNA, pathway inhibition, tumor-bearing mouse model; and hepatocyte siRNA with lipid-droplet colocalization imaging\",\n      \"pmids\": [\"37439183\", \"36930872\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct phosphorylation substrates in p38/FoxO3 axis not defined\", \"Hepatocyte lipid-droplet role single-lab without replication\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Placed TAOK1 upstream of the Hippo pathway via STK3/MST2 phosphorylation, with an lncRNA-mediated disruption mechanism affecting YAP1 localization.\",\n      \"evidence\": \"Co-IP, RNA pull-down, STK3 phosphorylation assays and YAP1 localization imaging\",\n      \"pmids\": [\"39528458\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct STK3 phosphosite not mapped\", \"Physiological relevance beyond cancer context unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified a nuclear genome-maintenance role, showing TAOK1 phosphorylates USP7 to stabilize RAD51 and enable homologous recombination, with therapeutic relevance to PARP inhibitor sensitivity.\",\n      \"evidence\": \"Kinase inhibitor screen, in vitro kinase assay, Co-IP, RAD51 ubiquitylation/degradation and HR reporter assays in cancer cells\",\n      \"pmids\": [\"40106350\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"USP7 phosphosite and how it enhances DUB activity not fully defined\", \"How TAOK1 is recruited to sites of HR repair unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed a kinase-independent role at replication forks, where TAOK1 depletion stabilizes forks and confers PARP inhibitor/IR resistance in BRCA-deficient cells.\",\n      \"evidence\": \"siRNA/genetic depletion, DNA fiber assays, PCNA Co-IP and ISG15 measurement in BRCA1/2-deficient cells (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed\", \"Apparent opposition to the HR-promoting role at forks not reconciled\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TAOK1's catalytic versus scaffolding modes are switched across its many contexts—and what upstream signals select among cytoskeletal, immune, metabolic, behavioral, and DNA-repair functions—remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unifying model for context-specific substrate selection\", \"Upstream activators of TAOK1 across pathways largely uncharacterized\", \"Reconciliation of opposing pro- and anti-inflammatory and pro- and anti-fork-stability roles lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 12, 13]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 5, 12]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [4, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 6]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"GO:0005811\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2, 13]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [3, 4, 6]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 8, 10]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"MARK2\", \"TESK1\", \"Spred1\", \"TRAF6\", \"TPL2\", \"TBK1\", \"USP7\", \"STK3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}