{"gene":"TAOK1","run_date":"2026-04-28T21:42:58","timeline":{"discoveries":[{"year":2003,"finding":"MARKK (TAOK1) is an upstream activator of MARK/PAR-1 kinase; it phosphorylates MARK2 within the activation loop at T208, activating MARK and leading to downstream phosphorylation of microtubule-associated proteins (tau/MAP2/MAP4) at KXGS motifs, causing microtubule disassembly and, in neuronal cells, promoting neurite outgrowth.","method":"In vitro kinase assay, site-directed mutagenesis (T208 in MARK2), cell overexpression with microtubule dynamics readout","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — in vitro phosphorylation assay with mutagenesis identifying specific activation-loop site, functional cellular readout","pmids":["14517247"],"is_preprint":false},{"year":2008,"finding":"MARKK/TAO1 (TAOK1) interacts with two new binding partners identified by yeast two-hybrid: Spred1 (which binds MARKK without affecting its activity) and TESK1 (which binds and inhibits MARKK). TESK1 blocks MARKK-driven microtubule disruption, while Spred1 relieves TESK1 inhibition of cofilin phosphorylation, creating a three-way regulatory network linking microtubule and F-actin cytoskeleton dynamics.","method":"Yeast two-hybrid, co-immunoprecipitation, CHO cell overexpression with cytoskeletal phenotype readout","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — reciprocal binding and functional consequences validated in cells with multiple partners and orthogonal methods","pmids":["18216281"],"is_preprint":false},{"year":2006,"finding":"PSK2 (a TAOK1-related Ste20-like kinase) activates JNK and induces apoptotic morphology (cell contraction, membrane blebbing, apoptotic body formation); it also stimulates ROCK-I cleavage, and caspase 3 cleaves PSK2 itself; dominant-negative JNK or ROCK-I inhibition blocked these morphological responses, establishing PSK2 as an upstream regulator of JNK and ROCK-I in the execution phase of apoptosis.","method":"Dominant-negative expression, kinase activity assay, caspase substrate assay, morphological readout","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO/DN with defined cellular phenotype, but single lab study on PSK2 (TAOK1 paralog context; corpus identifies PSK2 as TAOK1-related)","pmids":["16407310"],"is_preprint":false},{"year":2018,"finding":"TAOK1 negatively regulates IL-17 signaling by physically interacting with IL-17 receptor A (IL-17RA) in a kinase-activity-independent manner and dose-dependently preventing formation of the IL-17R–Act1 complex, thereby suppressing downstream MAP kinase and NF-κB activation.","method":"Co-immunoprecipitation, TAOK1 knockdown with cytokine/signaling readout, kinase-dead mutant analysis, in vivo colitis model","journal":"Cellular & molecular immunology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP identifying binding partner, kinase-dead mutant dissecting mechanism, in vivo validation","pmids":["29400705"],"is_preprint":false},{"year":2020,"finding":"TAOK1 positively regulates TLR4-triggered 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 showed decreased susceptibility to endotoxin shock.","method":"Co-immunoprecipitation (TAOK1–TRAF6–TPL2 complex), TAOK1 knockdown/KO with ERK1/2 phosphorylation readout, in vivo endotoxin shock model","journal":"Molecular immunology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, clean KO in vivo with defined signaling phenotype","pmids":["32344244"],"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 NDD-associated variants can act as loss-of-function or dominant-negative alleles, establishing that TAOK1 kinase activity must be properly controlled for normal neuronal function.","method":"In utero electroporation (neural migration assay), primary neuron culture (maturation assay), patient fibroblast analysis, functional characterization of missense variants","journal":"Human mutation","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal in vivo and in vitro methods, loss-of-function and dominant-negative variants with defined phenotypes","pmids":["33565190"],"is_preprint":false},{"year":2023,"finding":"TAOK1 is a plasma membrane remodeling kinase: its coiled-coil triple-helical region C-terminal to the kinase domain directly binds phosphoinositides, targeting TAOK1 to the plasma membrane. Autophosphorylation of T440 and T443 within this region by the kinase domain blocks membrane association. NDD-associated TAOK1 missense mutants are catalytically inactive, become aberrantly trapped in a membrane-bound state, and induce abnormal membrane protrusions and aberrant dendritic arbor growth in hippocampal neurons.","method":"In vitro phospholipid-binding assay, autophosphorylation assay, mutagenesis of T440/T443, live-cell imaging, primary hippocampal neuron morphology assay, in silico structure prediction of triple helix","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 1 — reconstitution of phospholipid binding, autophosphorylation with mutagenesis, neuronal functional validation, multiple orthogonal methods","pmids":["36595571"],"is_preprint":false},{"year":2023,"finding":"TAOK1 positively regulates antiviral innate immune responses by constitutively associating with TBK1 and enhancing TBK1–IRF3 complex formation in a kinase-activity-dependent manner; viral infection induces TAOK1 to switch from binding MAP4 to binding dynein, enabling trafficking of TBK1 along microtubules to the perinuclear region where it binds IRF3, and microtubule depolymerization impairs this IRF3 activation.","method":"Co-immunoprecipitation (TAOK1–TBK1, TAOK1–dynein, TAOK1–MAP4), kinase-dead mutant, microtubule depolymerization, type I IFN production assay","journal":"Journal of innate immunity","confidence":"High","confidence_rationale":"Tier 2 — multiple reciprocal Co-IPs, kinase-dead mutant dissecting mechanism, microtubule functional test","pmids":["36649698"],"is_preprint":false},{"year":2023,"finding":"TAOK1 protein fully colocalizes with intracellular lipid droplets in human and mouse hepatocytes (determined by immunofluorescence); silencing TAOK1 inhibits ERK and JNK activation and represses ACC protein abundance, alleviating hepatocyte lipotoxicity by shifting fatty acid partitioning toward catabolism.","method":"Immunofluorescence colocalization, siRNA knockdown, immunoblotting for ERK, JNK, ACC, functional metabolic assays","journal":"Hepatology communications","confidence":"Medium","confidence_rationale":"Tier 2–3 — direct colocalization plus signaling readout, but single lab, no reconstitution","pmids":["36930872"],"is_preprint":false},{"year":2023,"finding":"TAOK1 promotes cancer cachexia-associated muscle atrophy by activating the p38-MAPK pathway, leading to FoxO3 nuclear translocation and upregulation of ubiquitin-proteasome and autophagy-lysosome protein degradation pathways; Corylifol A was identified as a direct-binding inhibitor of TAOK1 (confirmed by biotin-streptavidin pulldown and microscale thermophoresis), and its ameliorating effect on muscle atrophy was reversed by siRNA knockdown of TAOK1 or pathway manipulation.","method":"Biotin-streptavidin pulldown, microscale thermophoresis, siRNA knockdown, Western blotting (p38/FoxO3 pathway), in vivo tumor-bearing mouse model","journal":"Journal of cachexia, sarcopenia and muscle","confidence":"High","confidence_rationale":"Tier 1–2 — direct binding demonstrated by biophysical assay, epistasis via siRNA, in vivo validation","pmids":["37439183"],"is_preprint":false},{"year":2023,"finding":"Taok1 haploinsufficiency in mice reduces activation of dorsal raphe nucleus (DRN) neurons during social interaction, causes aberrant phosphorylation of numerous proteins, and produces autistic-like behaviors; selective deletion of Taok1 in VGlut3-positive DRN neurons recapitulates this phenotype, and reintroduction of wild-type but not kinase-dead Taok1 into DRN rescues the behavior.","method":"Conditional knockout (Cre-mediated), viral rescue with kinase-dead mutant, in vivo calcium imaging of DRN neurons, behavioral assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific KO with behavioral phenotype, kinase-dead rescue experiment establishing kinase activity requirement","pmids":["37656623"],"is_preprint":false},{"year":2025,"finding":"TAOK1 phosphorylates USP7, thereby promoting USP7 deubiquitylase activity and preventing ubiquitylation and degradation of RAD51; this stabilizes RAD51 filament formation at DNA damage sites and supports homologous recombination (HR) repair; genetic or pharmacological inhibition of TAOK1 impairs USP7 function, causes RAD51 degradation, disrupts HR, and sensitizes tumor cells to PARP inhibitors.","method":"High-throughput kinase inhibitor screen, in vitro kinase assay (TAOK1 phosphorylating USP7), ubiquitylation assay, RAD51 foci/filament assay, HR reporter assay, PARP inhibitor sensitivity assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — in vitro kinase assay identifying substrate (USP7), mechanistic dissection via multiple orthogonal methods, functional HR readout","pmids":["40106350"],"is_preprint":false},{"year":2024,"finding":"ELFN1-AS1 lncRNA binds to the kinase domain of TAOK1 and disrupts the TAOK1–STK3 (MST2) interaction, leading to decreased STK3 phosphorylation, attenuation of the Hippo kinase cascade, reduced YAP1 phosphorylation, and increased nuclear YAP1/MYC signaling in gastric cancer cells.","method":"Co-immunoprecipitation (TAOK1–STK3 interaction), RNA–protein binding assay, Western blotting for Hippo pathway components, loss-of-function experiments","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP and functional knockdown from single lab without reconstitution","pmids":["39528458"],"is_preprint":false},{"year":2024,"finding":"TAOK1 interacts with CDC20 (confirmed by Co-IP), and TAOK1 overexpression protects endothelial cells from ox-LDL-induced apoptosis and senescence; CDC20 siRNA reverses these protective effects, placing CDC20 downstream of TAOK1 in endothelial stress signaling.","method":"Co-immunoprecipitation (TAOK1–CDC20), siRNA knockdown, flow cytometry for apoptosis and cell cycle, Western blotting","journal":"Discovery medicine","confidence":"Low","confidence_rationale":"Tier 3 — single Co-IP from single lab, limited mechanistic follow-up","pmids":["39726311"],"is_preprint":false},{"year":2025,"finding":"TAOK1 regulates replication fork (RF) stability independently of its kinase activity; it interacts with PCNA and regulates ISG15 levels to affect RF stability; TAOK1 depletion stabilizes RFs and reduces replication-associated DNA damage in BRCA1/2-deficient cells, conferring resistance to PARP inhibitors and ionizing radiation.","method":"CRISPR/siRNA depletion, kinase-dead mutant rescue, Co-IP (TAOK1–PCNA), DNA fiber assay (fork stability), ISG15 immunoblotting, PARP inhibitor/IR sensitivity assay","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — kinase-dead mutant establishing kinase-independent mechanism, Co-IP, DNA fiber assay; preprint, not yet peer-reviewed","pmids":["bio_10.1101_2025.10.14.682031"],"is_preprint":true},{"year":2025,"finding":"Schip1 interacts with Taok1 to activate the p38 MAPK signaling pathway, promoting osteoclast differentiation; genetic ablation of Schip1 in mice results in osteosclerosis and attenuates ovariectomy-induced osteoporosis.","method":"Co-immunoprecipitation (Schip1–Taok1), Schip1 knockout mice, osteoclast differentiation assay, Western blotting for p38 MAPK pathway","journal":"Bone","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus in vivo KO with defined bone phenotype, single lab","pmids":["40633827"],"is_preprint":false},{"year":2025,"finding":"LINC01198 directly associates with TAOK1/2, inhibits their phosphorylation, and elicits downstream Hippo signaling through the TAOK/LATS axis, redistributing YAP/TAZ to the nucleus and promoting IL-1β expression to drive vemurafenib resistance in melanoma.","method":"RNA pull-down/Co-IP (LINC01198–TAOK1/2 association), phosphorylation assay, loss-of-function experiments, YAP/TAZ nuclear localization assay","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 3 — RNA–protein binding and functional pathway data from single lab, limited biochemical reconstitution","pmids":["41145465"],"is_preprint":false},{"year":2019,"finding":"De novo variants in TAOK1 reduce mRNA levels via nonsense-mediated mRNA decay, abolish detectable phosphorylated TAO1 kinase and phosphorylated tau, and alter mitochondrial morphology in patient fibroblasts; knockdown of Tao1 in Drosophila alters neuromuscular junction morphology and mitochondrial distribution in motor neuron axons.","method":"Patient fibroblast analysis (cycloheximide NMD assay, Western blot for p-TAO1 and p-tau, mitochondrial imaging), Drosophila Tao1 knockdown with NMJ morphology and mitochondrial readout","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods in patient cells and model organism, single study","pmids":["31230721"],"is_preprint":false}],"current_model":"TAOK1 is a Ste20-family serine/threonine kinase that acts at multiple cellular nodes: it activates MARK/PAR-1 by phosphorylating its activation loop (T208) to regulate microtubule dynamics and cell polarity; it remodels the plasma membrane through direct phosphoinositide binding via a C-terminal coiled-coil triple-helical region, with autophosphorylation at T440/T443 terminating membrane association; it promotes homologous recombination repair by phosphorylating USP7 to stabilize RAD51; it modulates innate immune signaling by scaffolding TBK1–IRF3 complex formation and trafficking TBK1 along microtubules in an antiviral context, and by interacting with IL-17RA to suppress IL-17/Act1 signaling; it drives p38-MAPK–FoxO3-mediated muscle protein degradation in cancer cachexia; and it is essential in the dorsal raphe nucleus for social behavior, with its kinase activity required for neuronal function and cortical migration."},"narrative":{"teleology":[{"year":2003,"claim":"Identifying TAOK1 as the activating kinase upstream of MARK/PAR-1 established the first defined substrate and linked TAOK1 to microtubule dynamics and cell polarity.","evidence":"In vitro kinase assay with T208 mutagenesis in MARK2, cell-based microtubule disassembly and neurite outgrowth readouts","pmids":["14517247"],"confidence":"High","gaps":["Other MARK activation-loop kinases not excluded","In vivo requirement for TAOK1-MARK axis not tested"]},{"year":2008,"claim":"Discovery of TESK1 as a TAOK1 inhibitor and Spred1 as a binding partner revealed a three-way regulatory circuit connecting microtubule and actin cytoskeleton dynamics upstream and downstream of TAOK1.","evidence":"Yeast two-hybrid, reciprocal Co-IP, CHO cell cytoskeletal phenotype assays","pmids":["18216281"],"confidence":"High","gaps":["Structural basis of TESK1 inhibition unknown","Physiological context of Spred1-TESK1-TAOK1 network not defined in vivo"]},{"year":2018,"claim":"Demonstrating that TAOK1 suppresses IL-17 signaling by physically blocking IL-17RA–Act1 interaction in a kinase-independent manner established a scaffolding role distinct from its catalytic functions.","evidence":"Co-IP, kinase-dead mutant, TAOK1 knockdown with cytokine readout, in vivo colitis model","pmids":["29400705"],"confidence":"High","gaps":["Binding interface between TAOK1 and IL-17RA not mapped","Relative contribution versus other IL-17R regulators unknown"]},{"year":2019,"claim":"Patient-derived de novo TAOK1 variants causing nonsense-mediated decay and loss of kinase activity linked TAOK1 haploinsufficiency to neurodevelopmental disorder, with altered mitochondrial morphology in patient fibroblasts and Drosophila neurons providing the first disease-associated phenotypes.","evidence":"Patient fibroblast NMD assay, Western blot for p-TAO1/p-tau, mitochondrial imaging, Drosophila Tao1 knockdown NMJ analysis","pmids":["31230721"],"confidence":"Medium","gaps":["Mechanism by which TAOK1 controls mitochondrial morphology not defined","Patient cohort limited; genotype-phenotype correlation incomplete"]},{"year":2020,"claim":"Identification of constitutive TAOK1–TRAF6–TPL2 complex formation driving TLR4-triggered ERK1/2 activation expanded TAOK1's immune role to innate inflammatory signaling in macrophages.","evidence":"Co-IP of endogenous complex, TAOK1-KO mice with reduced endotoxin shock susceptibility","pmids":["32344244"],"confidence":"High","gaps":["Direct phosphorylation of TPL2 or TRAF6 by TAOK1 not demonstrated","Kinase-dependent versus scaffolding role in TLR4 pathway not dissected"]},{"year":2021,"claim":"In utero electroporation and functional characterization of NDD-associated missense variants demonstrated that both TAOK1 loss-of-function and dominant-negative alleles disrupt cortical neuronal migration and maturation, establishing dosage sensitivity.","evidence":"In utero electroporation migration assay, primary neuron maturation assay, patient fibroblast analysis","pmids":["33565190"],"confidence":"High","gaps":["Downstream substrates mediating migration defect not identified","Whether dominant-negative effect operates through MARK or another pathway unclear"]},{"year":2023,"claim":"Reconstitution of direct phosphoinositide binding by the TAOK1 coiled-coil triple helix and identification of T440/T443 autophosphorylation as a membrane-release switch revealed how catalytic activity self-limits membrane association, explaining why kinase-dead NDD mutants become trapped at the membrane and cause aberrant dendritic morphology.","evidence":"In vitro phospholipid-binding assay, autophosphorylation mutagenesis, live-cell imaging, hippocampal neuron morphology","pmids":["36595571"],"confidence":"High","gaps":["Crystal structure of the triple-helical membrane-binding domain not solved","Whether membrane trapping fully explains NDD pathogenesis not tested in vivo"]},{"year":2023,"claim":"Demonstration that TAOK1 switches from MAP4 to dynein binding upon viral infection to traffic TBK1 along microtubules to perinuclear IRF3 established a microtubule-dependent antiviral signaling mechanism requiring TAOK1 kinase activity.","evidence":"Co-IP of TAOK1–TBK1/dynein/MAP4, kinase-dead mutant, microtubule depolymerization, type I IFN assay","pmids":["36649698"],"confidence":"High","gaps":["Direct TAOK1 phosphorylation target in TBK1–IRF3 axis not identified","Trigger for MAP4-to-dynein switch at the molecular level unknown"]},{"year":2023,"claim":"Identification of TAOK1–p38-MAPK–FoxO3 signaling driving ubiquitin-proteasome and autophagy-lysosome pathways in cancer cachexia-associated muscle atrophy, with Corylifol A validated as a direct TAOK1-binding inhibitor, connected TAOK1 to metabolic muscle wasting.","evidence":"Biotin-streptavidin pulldown and microscale thermophoresis for Corylifol A binding, siRNA epistasis, tumor-bearing mouse model","pmids":["37439183"],"confidence":"High","gaps":["Direct p38 phosphorylation by TAOK1 versus intermediate kinase not resolved","Whether Corylifol A is selective for TAOK1 over TAOK2/3 not fully profiled"]},{"year":2023,"claim":"Cell-type-specific deletion of Taok1 in VGlut3-positive dorsal raphe neurons recapitulated autistic-like social behavior, and rescue required kinase-active TAOK1, pinpointing the neural circuit and enzymatic requirement for TAOK1 in social behavior.","evidence":"Conditional Cre-mediated KO, viral kinase-dead rescue, in vivo calcium imaging of DRN neurons, behavioral assays","pmids":["37656623"],"confidence":"High","gaps":["DRN substrates of TAOK1 kinase not identified","Whether downstream mechanism involves MARK, p38, or a novel pathway not determined"]},{"year":2025,"claim":"TAOK1 phosphorylation of USP7 to stabilize RAD51 for homologous recombination established a new catalytic substrate and linked TAOK1 to DNA repair and PARP inhibitor sensitivity.","evidence":"In vitro kinase assay (TAOK1 phosphorylating USP7), ubiquitylation assay, RAD51 foci assay, HR reporter, PARP inhibitor sensitization","pmids":["40106350"],"confidence":"High","gaps":["Specific USP7 phosphorylation site(s) not mapped","Relative contribution of TAOK1 versus TAOK2/3 to HR in vivo not resolved"]},{"year":2025,"claim":"TAOK1 interaction with Schip1 activating p38 MAPK to promote osteoclast differentiation extended TAOK1's p38-activating role to bone remodeling.","evidence":"Co-IP (Schip1–Taok1), Schip1 KO mice with osteosclerosis phenotype, osteoclast differentiation assay","pmids":["40633827"],"confidence":"Medium","gaps":["Whether TAOK1 is the sole Schip1-activated kinase not excluded","Direct TAOK1 kinase substrate in osteoclast differentiation unknown"]},{"year":null,"claim":"Key open questions include the structural basis for TAOK1's phosphoinositide binding and membrane release, the full phosphoproteome of TAOK1 substrates across its diverse cellular roles, how TAOK1 kinase activity versus scaffolding functions are differentially regulated in immune versus neuronal contexts, and the mechanism by which TAOK1 controls replication fork stability independent of its kinase activity.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of TAOK1 triple-helical domain or kinase domain with substrates","Full phosphoproteome of TAOK1 not characterized","Kinase-independent replication fork stabilization mechanism not reconstituted"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,6,9,11]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[6]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,4,7]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,3,12]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[6]},{"term_id":"GO:0005811","term_label":"lipid droplet","supporting_discovery_ids":[8]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,7]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,3,4,7,9,12,15,16]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[3,4,7]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[11]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5,6,10,17]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[2]}],"complexes":["TRAF6–TPL2–TAOK1","TBK1–TAOK1"],"partners":["MARK2","TESK1","IL17RA","TRAF6","TPL2","TBK1","USP7","PCNA"],"other_free_text":[]},"mechanistic_narrative":"TAOK1 is a Ste20-family serine/threonine kinase that functions as a signaling hub linking cytoskeletal regulation, innate immunity, DNA repair, and neuronal development. It directly phosphorylates the MARK2 activation loop (T208) to drive microtubule disassembly and neurite outgrowth [PMID:14517247], binds plasma membrane phosphoinositides via a C-terminal coiled-coil triple-helical region with autophosphorylation at T440/T443 terminating membrane association to control dendritic arbor morphology [PMID:36595571], and phosphorylates USP7 to stabilize RAD51 and promote homologous recombination repair [PMID:40106350]. TAOK1 also scaffolds innate immune signaling complexes—constitutively associating with TBK1 to facilitate microtubule-dependent TBK1–IRF3 antiviral signaling [PMID:36649698], interacting with TRAF6–TPL2 to promote TLR4-triggered ERK1/2 activation [PMID:32344244], and suppressing IL-17R–Act1 complex formation in a kinase-independent manner [PMID:29400705]—while activating p38-MAPK to drive FoxO3-dependent muscle protein degradation in cancer cachexia [PMID:37439183] and Hippo pathway signaling through STK3/LATS [PMID:39528458]. De novo loss-of-function and dominant-negative TAOK1 variants cause neurodevelopmental disorder characterized by impaired cortical neuronal migration, altered mitochondrial morphology, and autistic-like social behavior deficits arising from dorsal raphe nucleus dysfunction [PMID:33565190, PMID:31230721, PMID:37656623]."},"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, a Ste20-like kinase, activates the polarity-inducing kinase MARK/PAR-1.","date":"2003","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/14517247","citation_count":165,"is_preprint":false},{"pmid":"31864017","id":"PMC_31864017","title":"miR-381-abundant small extracellular vesicles derived from kartogenin-preconditioned mesenchymal stem cells promote chondrogenesis of MSCs by targeting TAOK1.","date":"2019","source":"Biomaterials","url":"https://pubmed.ncbi.nlm.nih.gov/31864017","citation_count":58,"is_preprint":false},{"pmid":"18216281","id":"PMC_18216281","title":"Spred1 and TESK1--two new interaction partners of the kinase MARKK/TAO1 that link the microtubule and actin cytoskeleton.","date":"2008","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/18216281","citation_count":54,"is_preprint":false},{"pmid":"29400705","id":"PMC_29400705","title":"TAOK1 negatively regulates IL-17-mediated signaling and inflammation.","date":"2018","source":"Cellular & molecular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/29400705","citation_count":47,"is_preprint":false},{"pmid":"16407310","id":"PMC_16407310","title":"Prostate-derived sterile 20-like kinase 2 (PSK2) regulates apoptotic morphology via C-Jun N-terminal kinase and Rho kinase-1.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16407310","citation_count":44,"is_preprint":false},{"pmid":"31230721","id":"PMC_31230721","title":"De Novo Variants in TAOK1 Cause Neurodevelopmental Disorders.","date":"2019","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/31230721","citation_count":38,"is_preprint":false},{"pmid":"33565190","id":"PMC_33565190","title":"TAOK1 is associated with neurodevelopmental disorder and essential for neuronal maturation and cortical development.","date":"2021","source":"Human 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mutagenesis (T208 in MARK2), cell overexpression with microtubule dynamics readout\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro phosphorylation assay with mutagenesis identifying specific activation-loop site, functional cellular readout\",\n      \"pmids\": [\"14517247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"MARKK/TAO1 (TAOK1) interacts with two new binding partners identified by yeast two-hybrid: Spred1 (which binds MARKK without affecting its activity) and TESK1 (which binds and inhibits MARKK). TESK1 blocks MARKK-driven microtubule disruption, while Spred1 relieves TESK1 inhibition of cofilin phosphorylation, creating a three-way regulatory network linking microtubule and F-actin cytoskeleton dynamics.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, CHO cell overexpression with cytoskeletal phenotype readout\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding and functional consequences validated in cells with multiple partners and orthogonal methods\",\n      \"pmids\": [\"18216281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PSK2 (a TAOK1-related Ste20-like kinase) activates JNK and induces apoptotic morphology (cell contraction, membrane blebbing, apoptotic body formation); it also stimulates ROCK-I cleavage, and caspase 3 cleaves PSK2 itself; dominant-negative JNK or ROCK-I inhibition blocked these morphological responses, establishing PSK2 as an upstream regulator of JNK and ROCK-I in the execution phase of apoptosis.\",\n      \"method\": \"Dominant-negative expression, kinase activity assay, caspase substrate assay, morphological readout\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO/DN with defined cellular phenotype, but single lab study on PSK2 (TAOK1 paralog context; corpus identifies PSK2 as TAOK1-related)\",\n      \"pmids\": [\"16407310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TAOK1 negatively regulates IL-17 signaling by physically interacting with IL-17 receptor A (IL-17RA) in a kinase-activity-independent manner and dose-dependently preventing formation of the IL-17R–Act1 complex, thereby suppressing downstream MAP kinase and NF-κB activation.\",\n      \"method\": \"Co-immunoprecipitation, TAOK1 knockdown with cytokine/signaling readout, kinase-dead mutant analysis, in vivo colitis model\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP identifying binding partner, kinase-dead mutant dissecting mechanism, in vivo validation\",\n      \"pmids\": [\"29400705\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TAOK1 positively regulates TLR4-triggered 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 showed decreased susceptibility to endotoxin shock.\",\n      \"method\": \"Co-immunoprecipitation (TAOK1–TRAF6–TPL2 complex), TAOK1 knockdown/KO with ERK1/2 phosphorylation readout, in vivo endotoxin shock model\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, clean KO in vivo with defined signaling phenotype\",\n      \"pmids\": [\"32344244\"],\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 NDD-associated variants can act as loss-of-function or dominant-negative alleles, establishing that TAOK1 kinase activity must be properly controlled for normal neuronal function.\",\n      \"method\": \"In utero electroporation (neural migration assay), primary neuron culture (maturation assay), patient fibroblast analysis, functional characterization of missense variants\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal in vivo and in vitro methods, loss-of-function and dominant-negative variants with defined phenotypes\",\n      \"pmids\": [\"33565190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TAOK1 is a plasma membrane remodeling kinase: its coiled-coil triple-helical region C-terminal to the kinase domain directly binds phosphoinositides, targeting TAOK1 to the plasma membrane. Autophosphorylation of T440 and T443 within this region by the kinase domain blocks membrane association. NDD-associated TAOK1 missense mutants are catalytically inactive, become aberrantly trapped in a membrane-bound state, and induce abnormal membrane protrusions and aberrant dendritic arbor growth in hippocampal neurons.\",\n      \"method\": \"In vitro phospholipid-binding assay, autophosphorylation assay, mutagenesis of T440/T443, live-cell imaging, primary hippocampal neuron morphology assay, in silico structure prediction of triple helix\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution of phospholipid binding, autophosphorylation with mutagenesis, neuronal functional validation, multiple orthogonal methods\",\n      \"pmids\": [\"36595571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TAOK1 positively regulates antiviral innate immune responses by constitutively associating with TBK1 and enhancing TBK1–IRF3 complex formation in a kinase-activity-dependent manner; viral infection induces TAOK1 to switch from binding MAP4 to binding dynein, enabling trafficking of TBK1 along microtubules to the perinuclear region where it binds IRF3, and microtubule depolymerization impairs this IRF3 activation.\",\n      \"method\": \"Co-immunoprecipitation (TAOK1–TBK1, TAOK1–dynein, TAOK1–MAP4), kinase-dead mutant, microtubule depolymerization, type I IFN production assay\",\n      \"journal\": \"Journal of innate immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple reciprocal Co-IPs, kinase-dead mutant dissecting mechanism, microtubule functional test\",\n      \"pmids\": [\"36649698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TAOK1 protein fully colocalizes with intracellular lipid droplets in human and mouse hepatocytes (determined by immunofluorescence); silencing TAOK1 inhibits ERK and JNK activation and represses ACC protein abundance, alleviating hepatocyte lipotoxicity by shifting fatty acid partitioning toward catabolism.\",\n      \"method\": \"Immunofluorescence colocalization, siRNA knockdown, immunoblotting for ERK, JNK, ACC, functional metabolic assays\",\n      \"journal\": \"Hepatology communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — direct colocalization plus signaling readout, but single lab, no reconstitution\",\n      \"pmids\": [\"36930872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TAOK1 promotes cancer cachexia-associated muscle atrophy by activating the p38-MAPK pathway, leading to FoxO3 nuclear translocation and upregulation of ubiquitin-proteasome and autophagy-lysosome protein degradation pathways; Corylifol A was identified as a direct-binding inhibitor of TAOK1 (confirmed by biotin-streptavidin pulldown and microscale thermophoresis), and its ameliorating effect on muscle atrophy was reversed by siRNA knockdown of TAOK1 or pathway manipulation.\",\n      \"method\": \"Biotin-streptavidin pulldown, microscale thermophoresis, siRNA knockdown, Western blotting (p38/FoxO3 pathway), in vivo tumor-bearing mouse model\",\n      \"journal\": \"Journal of cachexia, sarcopenia and muscle\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct binding demonstrated by biophysical assay, epistasis via siRNA, in vivo validation\",\n      \"pmids\": [\"37439183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Taok1 haploinsufficiency in mice reduces activation of dorsal raphe nucleus (DRN) neurons during social interaction, causes aberrant phosphorylation of numerous proteins, and produces autistic-like behaviors; selective deletion of Taok1 in VGlut3-positive DRN neurons recapitulates this phenotype, and reintroduction of wild-type but not kinase-dead Taok1 into DRN rescues the behavior.\",\n      \"method\": \"Conditional knockout (Cre-mediated), viral rescue with kinase-dead mutant, in vivo calcium imaging of DRN neurons, behavioral assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific KO with behavioral phenotype, kinase-dead rescue experiment establishing kinase activity requirement\",\n      \"pmids\": [\"37656623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TAOK1 phosphorylates USP7, thereby promoting USP7 deubiquitylase activity and preventing ubiquitylation and degradation of RAD51; this stabilizes RAD51 filament formation at DNA damage sites and supports homologous recombination (HR) repair; genetic or pharmacological inhibition of TAOK1 impairs USP7 function, causes RAD51 degradation, disrupts HR, and sensitizes tumor cells to PARP inhibitors.\",\n      \"method\": \"High-throughput kinase inhibitor screen, in vitro kinase assay (TAOK1 phosphorylating USP7), ubiquitylation assay, RAD51 foci/filament assay, HR reporter assay, PARP inhibitor sensitivity assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinase assay identifying substrate (USP7), mechanistic dissection via multiple orthogonal methods, functional HR readout\",\n      \"pmids\": [\"40106350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ELFN1-AS1 lncRNA binds to the kinase domain of TAOK1 and disrupts the TAOK1–STK3 (MST2) interaction, leading to decreased STK3 phosphorylation, attenuation of the Hippo kinase cascade, reduced YAP1 phosphorylation, and increased nuclear YAP1/MYC signaling in gastric cancer cells.\",\n      \"method\": \"Co-immunoprecipitation (TAOK1–STK3 interaction), RNA–protein binding assay, Western blotting for Hippo pathway components, loss-of-function experiments\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP and functional knockdown from single lab without reconstitution\",\n      \"pmids\": [\"39528458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TAOK1 interacts with CDC20 (confirmed by Co-IP), and TAOK1 overexpression protects endothelial cells from ox-LDL-induced apoptosis and senescence; CDC20 siRNA reverses these protective effects, placing CDC20 downstream of TAOK1 in endothelial stress signaling.\",\n      \"method\": \"Co-immunoprecipitation (TAOK1–CDC20), siRNA knockdown, flow cytometry for apoptosis and cell cycle, Western blotting\",\n      \"journal\": \"Discovery medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP from single lab, limited mechanistic follow-up\",\n      \"pmids\": [\"39726311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TAOK1 regulates replication fork (RF) stability independently of its kinase activity; it interacts with PCNA and regulates ISG15 levels to affect RF stability; TAOK1 depletion stabilizes RFs and reduces replication-associated DNA damage in BRCA1/2-deficient cells, conferring resistance to PARP inhibitors and ionizing radiation.\",\n      \"method\": \"CRISPR/siRNA depletion, kinase-dead mutant rescue, Co-IP (TAOK1–PCNA), DNA fiber assay (fork stability), ISG15 immunoblotting, PARP inhibitor/IR sensitivity assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — kinase-dead mutant establishing kinase-independent mechanism, Co-IP, DNA fiber assay; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.10.14.682031\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Schip1 interacts with Taok1 to activate the p38 MAPK signaling pathway, promoting osteoclast differentiation; genetic ablation of Schip1 in mice results in osteosclerosis and attenuates ovariectomy-induced osteoporosis.\",\n      \"method\": \"Co-immunoprecipitation (Schip1–Taok1), Schip1 knockout mice, osteoclast differentiation assay, Western blotting for p38 MAPK pathway\",\n      \"journal\": \"Bone\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus in vivo KO with defined bone phenotype, single lab\",\n      \"pmids\": [\"40633827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LINC01198 directly associates with TAOK1/2, inhibits their phosphorylation, and elicits downstream Hippo signaling through the TAOK/LATS axis, redistributing YAP/TAZ to the nucleus and promoting IL-1β expression to drive vemurafenib resistance in melanoma.\",\n      \"method\": \"RNA pull-down/Co-IP (LINC01198–TAOK1/2 association), phosphorylation assay, loss-of-function experiments, YAP/TAZ nuclear localization assay\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — RNA–protein binding and functional pathway data from single lab, limited biochemical reconstitution\",\n      \"pmids\": [\"41145465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"De novo variants in TAOK1 reduce mRNA levels via nonsense-mediated mRNA decay, abolish detectable phosphorylated TAO1 kinase and phosphorylated tau, and alter mitochondrial morphology in patient fibroblasts; knockdown of Tao1 in Drosophila alters neuromuscular junction morphology and mitochondrial distribution in motor neuron axons.\",\n      \"method\": \"Patient fibroblast analysis (cycloheximide NMD assay, Western blot for p-TAO1 and p-tau, mitochondrial imaging), Drosophila Tao1 knockdown with NMJ morphology and mitochondrial readout\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in patient cells and model organism, single study\",\n      \"pmids\": [\"31230721\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TAOK1 is a Ste20-family serine/threonine kinase that acts at multiple cellular nodes: it activates MARK/PAR-1 by phosphorylating its activation loop (T208) to regulate microtubule dynamics and cell polarity; it remodels the plasma membrane through direct phosphoinositide binding via a C-terminal coiled-coil triple-helical region, with autophosphorylation at T440/T443 terminating membrane association; it promotes homologous recombination repair by phosphorylating USP7 to stabilize RAD51; it modulates innate immune signaling by scaffolding TBK1–IRF3 complex formation and trafficking TBK1 along microtubules in an antiviral context, and by interacting with IL-17RA to suppress IL-17/Act1 signaling; it drives p38-MAPK–FoxO3-mediated muscle protein degradation in cancer cachexia; and it is essential in the dorsal raphe nucleus for social behavior, with its kinase activity required for neuronal function and cortical migration.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TAOK1 is a Ste20-family serine/threonine kinase that functions as a signaling hub linking cytoskeletal regulation, innate immunity, DNA repair, and neuronal development. It directly phosphorylates the MARK2 activation loop (T208) to drive microtubule disassembly and neurite outgrowth [PMID:14517247], binds plasma membrane phosphoinositides via a C-terminal coiled-coil triple-helical region with autophosphorylation at T440/T443 terminating membrane association to control dendritic arbor morphology [PMID:36595571], and phosphorylates USP7 to stabilize RAD51 and promote homologous recombination repair [PMID:40106350]. TAOK1 also scaffolds innate immune signaling complexes—constitutively associating with TBK1 to facilitate microtubule-dependent TBK1–IRF3 antiviral signaling [PMID:36649698], interacting with TRAF6–TPL2 to promote TLR4-triggered ERK1/2 activation [PMID:32344244], and suppressing IL-17R–Act1 complex formation in a kinase-independent manner [PMID:29400705]—while activating p38-MAPK to drive FoxO3-dependent muscle protein degradation in cancer cachexia [PMID:37439183] and Hippo pathway signaling through STK3/LATS [PMID:39528458]. De novo loss-of-function and dominant-negative TAOK1 variants cause neurodevelopmental disorder characterized by impaired cortical neuronal migration, altered mitochondrial morphology, and autistic-like social behavior deficits arising from dorsal raphe nucleus dysfunction [PMID:33565190, PMID:31230721, PMID:37656623].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Identifying TAOK1 as the activating kinase upstream of MARK/PAR-1 established the first defined substrate and linked TAOK1 to microtubule dynamics and cell polarity.\",\n      \"evidence\": \"In vitro kinase assay with T208 mutagenesis in MARK2, cell-based microtubule disassembly and neurite outgrowth readouts\",\n      \"pmids\": [\"14517247\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Other MARK activation-loop kinases not excluded\", \"In vivo requirement for TAOK1-MARK axis not tested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Discovery of TESK1 as a TAOK1 inhibitor and Spred1 as a binding partner revealed a three-way regulatory circuit connecting microtubule and actin cytoskeleton dynamics upstream and downstream of TAOK1.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal Co-IP, CHO cell cytoskeletal phenotype assays\",\n      \"pmids\": [\"18216281\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of TESK1 inhibition unknown\", \"Physiological context of Spred1-TESK1-TAOK1 network not defined in vivo\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrating that TAOK1 suppresses IL-17 signaling by physically blocking IL-17RA–Act1 interaction in a kinase-independent manner established a scaffolding role distinct from its catalytic functions.\",\n      \"evidence\": \"Co-IP, kinase-dead mutant, TAOK1 knockdown with cytokine readout, in vivo colitis model\",\n      \"pmids\": [\"29400705\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding interface between TAOK1 and IL-17RA not mapped\", \"Relative contribution versus other IL-17R regulators unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Patient-derived de novo TAOK1 variants causing nonsense-mediated decay and loss of kinase activity linked TAOK1 haploinsufficiency to neurodevelopmental disorder, with altered mitochondrial morphology in patient fibroblasts and Drosophila neurons providing the first disease-associated phenotypes.\",\n      \"evidence\": \"Patient fibroblast NMD assay, Western blot for p-TAO1/p-tau, mitochondrial imaging, Drosophila Tao1 knockdown NMJ analysis\",\n      \"pmids\": [\"31230721\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which TAOK1 controls mitochondrial morphology not defined\", \"Patient cohort limited; genotype-phenotype correlation incomplete\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identification of constitutive TAOK1–TRAF6–TPL2 complex formation driving TLR4-triggered ERK1/2 activation expanded TAOK1's immune role to innate inflammatory signaling in macrophages.\",\n      \"evidence\": \"Co-IP of endogenous complex, TAOK1-KO mice with reduced endotoxin shock susceptibility\",\n      \"pmids\": [\"32344244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct phosphorylation of TPL2 or TRAF6 by TAOK1 not demonstrated\", \"Kinase-dependent versus scaffolding role in TLR4 pathway not dissected\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"In utero electroporation and functional characterization of NDD-associated missense variants demonstrated that both TAOK1 loss-of-function and dominant-negative alleles disrupt cortical neuronal migration and maturation, establishing dosage sensitivity.\",\n      \"evidence\": \"In utero electroporation migration assay, primary neuron maturation assay, patient fibroblast analysis\",\n      \"pmids\": [\"33565190\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream substrates mediating migration defect not identified\", \"Whether dominant-negative effect operates through MARK or another pathway unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Reconstitution of direct phosphoinositide binding by the TAOK1 coiled-coil triple helix and identification of T440/T443 autophosphorylation as a membrane-release switch revealed how catalytic activity self-limits membrane association, explaining why kinase-dead NDD mutants become trapped at the membrane and cause aberrant dendritic morphology.\",\n      \"evidence\": \"In vitro phospholipid-binding assay, autophosphorylation mutagenesis, live-cell imaging, hippocampal neuron morphology\",\n      \"pmids\": [\"36595571\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crystal structure of the triple-helical membrane-binding domain not solved\", \"Whether membrane trapping fully explains NDD pathogenesis not tested in vivo\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstration that TAOK1 switches from MAP4 to dynein binding upon viral infection to traffic TBK1 along microtubules to perinuclear IRF3 established a microtubule-dependent antiviral signaling mechanism requiring TAOK1 kinase activity.\",\n      \"evidence\": \"Co-IP of TAOK1–TBK1/dynein/MAP4, kinase-dead mutant, microtubule depolymerization, type I IFN assay\",\n      \"pmids\": [\"36649698\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct TAOK1 phosphorylation target in TBK1–IRF3 axis not identified\", \"Trigger for MAP4-to-dynein switch at the molecular level unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identification of TAOK1–p38-MAPK–FoxO3 signaling driving ubiquitin-proteasome and autophagy-lysosome pathways in cancer cachexia-associated muscle atrophy, with Corylifol A validated as a direct TAOK1-binding inhibitor, connected TAOK1 to metabolic muscle wasting.\",\n      \"evidence\": \"Biotin-streptavidin pulldown and microscale thermophoresis for Corylifol A binding, siRNA epistasis, tumor-bearing mouse model\",\n      \"pmids\": [\"37439183\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct p38 phosphorylation by TAOK1 versus intermediate kinase not resolved\", \"Whether Corylifol A is selective for TAOK1 over TAOK2/3 not fully profiled\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Cell-type-specific deletion of Taok1 in VGlut3-positive dorsal raphe neurons recapitulated autistic-like social behavior, and rescue required kinase-active TAOK1, pinpointing the neural circuit and enzymatic requirement for TAOK1 in social behavior.\",\n      \"evidence\": \"Conditional Cre-mediated KO, viral kinase-dead rescue, in vivo calcium imaging of DRN neurons, behavioral assays\",\n      \"pmids\": [\"37656623\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"DRN substrates of TAOK1 kinase not identified\", \"Whether downstream mechanism involves MARK, p38, or a novel pathway not determined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"TAOK1 phosphorylation of USP7 to stabilize RAD51 for homologous recombination established a new catalytic substrate and linked TAOK1 to DNA repair and PARP inhibitor sensitivity.\",\n      \"evidence\": \"In vitro kinase assay (TAOK1 phosphorylating USP7), ubiquitylation assay, RAD51 foci assay, HR reporter, PARP inhibitor sensitization\",\n      \"pmids\": [\"40106350\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific USP7 phosphorylation site(s) not mapped\", \"Relative contribution of TAOK1 versus TAOK2/3 to HR in vivo not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"TAOK1 interaction with Schip1 activating p38 MAPK to promote osteoclast differentiation extended TAOK1's p38-activating role to bone remodeling.\",\n      \"evidence\": \"Co-IP (Schip1–Taok1), Schip1 KO mice with osteosclerosis phenotype, osteoclast differentiation assay\",\n      \"pmids\": [\"40633827\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether TAOK1 is the sole Schip1-activated kinase not excluded\", \"Direct TAOK1 kinase substrate in osteoclast differentiation unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include the structural basis for TAOK1's phosphoinositide binding and membrane release, the full phosphoproteome of TAOK1 substrates across its diverse cellular roles, how TAOK1 kinase activity versus scaffolding functions are differentially regulated in immune versus neuronal contexts, and the mechanism by which TAOK1 controls replication fork stability independent of its kinase activity.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of TAOK1 triple-helical domain or kinase domain with substrates\", \"Full phosphoproteome of TAOK1 not characterized\", \"Kinase-independent replication fork stabilization mechanism not reconstituted\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 6, 9, 11]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 4, 7]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 3, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0005811\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 7]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 3, 4, 7, 9, 12, 15, 16]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [3, 4, 7]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [11]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 6, 10, 17]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [\n      \"TRAF6–TPL2–TAOK1\",\n      \"TBK1–TAOK1\"\n    ],\n    \"partners\": [\n      \"MARK2\",\n      \"TESK1\",\n      \"IL17RA\",\n      \"TRAF6\",\n      \"TPL2\",\n      \"TBK1\",\n      \"USP7\",\n      \"PCNA\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}