{"gene":"NLK","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1999,"finding":"TAK1 activation stimulates NLK kinase activity, and NLK phosphorylates TCF/LEF transcription factors, inhibiting the interaction of the β-catenin-TCF complex with DNA, thereby negatively regulating the Wnt/β-catenin signaling pathway. Injection of NLK suppresses β-catenin-induced axis duplication in Xenopus embryos.","method":"In vitro kinase assay, Xenopus microinjection, transcriptional reporter assay, DNA-binding assay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (in vitro kinase assay, embryo injection, DNA-binding assay), replicated across subsequent studies","pmids":["10391247"],"is_preprint":false},{"year":1998,"finding":"Murine NLK (Nlk) is a serine/threonine kinase that autophosphorylates; mutation of the ATP-binding Lys-155 to methionine or the activating threonine in kinase domain VIII abolishes autophosphorylation. NLK localizes predominantly to the nucleus (60–70%) with 30–40% cytoplasmic.","method":"Autophosphorylation kinase assay, site-directed mutagenesis, subcellular fractionation, immunofluorescence microscopy","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with mutagenesis plus direct localization by fractionation and immunofluorescence, single lab with multiple orthogonal methods","pmids":["9448268"],"is_preprint":false},{"year":2003,"finding":"The Wnt-5a/Ca2+ pathway activates CaMKII, which in turn stimulates the TAK1-NLK cascade. Wnt-5a overexpression in HEK293 cells activates NLK through TAK1, and activation of the chimeric receptor Rfz-2 activates endogenous CaMKII, TAK1, and NLK, inhibiting β-catenin-induced transcriptional activation.","method":"Kinase activity assay, chimeric receptor stimulation, transcriptional reporter assay, overexpression in HEK293 cells","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (kinase assays, chimeric receptor, reporter assay), replicated across labs","pmids":["12482967"],"is_preprint":false},{"year":2004,"finding":"NLK binds directly to c-Myb together with HIPK2, phosphorylates c-Myb at multiple sites, leading to its ubiquitination and proteasome-dependent degradation in response to Wnt-1 signaling via the TAK1-HIPK2-NLK pathway.","method":"Co-immunoprecipitation, in vitro kinase assay, ubiquitination assay, proteasome inhibitor experiments","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct binding confirmed by Co-IP, phosphorylation by in vitro kinase assay, degradation by proteasome inhibition, single lab with multiple methods","pmids":["15082531"],"is_preprint":false},{"year":2004,"finding":"The TAK1-NLK cascade phosphorylates STAT3 at serine residues; this phosphorylation is essential for TGF-β/activin-mediated mesoderm induction in Xenopus. Activin activates NLK, which directly phosphorylates STAT3.","method":"In vitro kinase assay, Xenopus morpholino depletion, co-expression rescue experiments, phosphorylation assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro phosphorylation of STAT3 by NLK, genetic depletion phenotype, multiple methods in single lab","pmids":["15004007"],"is_preprint":false},{"year":2006,"finding":"NLK associates with NARF (NLK-associated RING finger protein), an E3 ubiquitin ligase that uses E2-25K to ubiquitylate TCF/LEF. NLK kinase activity augments NARF binding and ubiquitylation of TCF/LEF, leading to proteasomal degradation of TCF/LEF and suppression of Wnt/β-catenin signaling.","method":"Yeast two-hybrid, Co-IP, in vitro ubiquitylation assay, Xenopus axis duplication assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro ubiquitylation reconstitution, reciprocal Co-IP, and Xenopus functional assay in single lab","pmids":["16714285"],"is_preprint":false},{"year":2005,"finding":"NLK phosphorylates A-Myb (but does not induce its degradation), inhibits the association between A-Myb and the coactivator CBP, and induces methylation of histone H3 at lysine-9 at A-Myb-bound promoters. NLK and HIPK2 both bind directly to A-Myb.","method":"Co-IP, in vitro kinase assay, chromatin immunoprecipitation, transcriptional reporter assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods (Co-IP, kinase assay, ChIP, reporter) in single lab","pmids":["16055500"],"is_preprint":false},{"year":2008,"finding":"Fbxw7α (F-box protein of SCF complex) directly binds c-Myb via its WD40 domain and induces c-Myb ubiquitination in a Wnt-1- and NLK-dependent manner. NLK phosphorylation of c-Myb enhances the c-Myb/Fbxw7α interaction; a c-Myb phosphorylation-site mutant fails to interact with Fbxw7α. NLK also binds Cul1 (SCF component).","method":"Co-IP, in vitro ubiquitination assay, mutant binding assay, siRNA knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro ubiquitination reconstitution, Co-IP, phosphorylation-site mutant analysis, multiple orthogonal methods in single lab","pmids":["18765672"],"is_preprint":false},{"year":2003,"finding":"HMG2L1 is an NLK-interacting protein identified by yeast two-hybrid screening; interaction confirmed in mammalian cells. HMG2L1 negatively regulates Wnt/β-catenin signaling, inhibiting β-catenin-stimulated transcriptional activity and Wnt-induced axis duplication in Xenopus.","method":"Yeast two-hybrid, Co-IP in mammalian cells, Xenopus axis duplication assay, transcriptional reporter assay","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid plus Co-IP and functional Xenopus assay, single lab","pmids":["12875653"],"is_preprint":false},{"year":2010,"finding":"TAB2 directly interacts with NLK and functions as a scaffold protein to facilitate the interaction between TAK1 and NLK. The intermediate region (residues 292–417) of TAB2 mediates NLK binding. TAB2 knockdown abolishes the TAK1-NLK interaction and NLK activation; TAB2 mediates TAK1-dependent NLK activation and LEF1 polyubiquitylation, inhibiting canonical Wnt signaling. Wnt3a stimulation increases the TAK1-TAB2-NLK complex.","method":"Co-IP, siRNA knockdown, domain-mapping mutant analysis, ubiquitylation assay, kinase assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, domain mapping, functional ubiquitylation and kinase assays, multiple orthogonal methods in single lab","pmids":["20194509"],"is_preprint":false},{"year":2011,"finding":"NLK phosphorylates the PERIOD (PER) protein at the 'per-short' domain in Drosophila, initiating a hierarchical phosphorylation cascade: NLK/NEMO phosphorylation at the per-short domain stimulates DOUBLETIME (DBT/CK1δ/ε) phosphorylation at nearby sites, delaying progressive DBT phosphorylation at distal sites required for SLIMB/β-TrCP recognition and proteasomal degradation, thereby setting circadian clock speed.","method":"Genetic epistasis in Drosophila, in vitro kinase assay, phosphorylation site mapping, mutant analysis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (genetics, in vitro kinase assay, phosphorylation mapping), published in high-impact journal with rigorous mechanistic dissection","pmids":["21514639"],"is_preprint":false},{"year":2011,"finding":"LIT-1 (C. elegans NLK ortholog) acts within glia to promote sensory compartment expansion in a Wnt-independent manner. LIT-1 localizes to the glial sensory compartment via its conserved C-terminus, which binds both actin and the Wnt-Aldrich syndrome protein (WASP) by two-hybrid and Co-IP. LIT-1 C-terminus localization requires neuronal signals and is necessary for its function.","method":"Genetic suppressor screen, electron microscopy reconstruction, yeast two-hybrid, Co-IP, fluorescence microscopy, fluorescence EM","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis, EM, Co-IP, yeast two-hybrid, and direct localization with functional consequence, multiple orthogonal methods","pmids":["21857800"],"is_preprint":false},{"year":2012,"finding":"NLK (Nlk2 in zebrafish) positively regulates Wnt/β-catenin signaling by phosphorylating LEF1, which causes LEF1 dissociation from HDAC, enabling transcriptional activation. NLK functions downstream of Dishevelled (Dvl) in Wnt/β-catenin signaling in neural progenitor cells.","method":"Zebrafish morpholino knockdown, epistasis analysis, in vitro kinase assay, Co-IP, reporter assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro kinase assay, genetic epistasis in zebrafish, Co-IP, reporter, multiple methods across species","pmids":["22373574"],"is_preprint":false},{"year":2015,"finding":"NLK phosphorylates Raptor at Ser863, disrupting its interaction with Rag GTPase, which is required for mTORC1 lysosomal recruitment. This inhibits mTORC1 lysosomal localization and suppresses mTORC1 activation in response to osmotic and oxidative stress. Cells with Nlk deletion or Raptor S863 phosphorylation-site knock-in are defective in rapid mTORC1 inhibition upon osmotic stress.","method":"In vitro kinase assay, phosphorylation site mutagenesis, Co-IP, lysosomal fractionation, Nlk knockout and knock-in mouse cells, mTORC1 activity assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay with mutagenesis, genetic knockout/knock-in validation, Co-IP, subcellular fractionation, multiple orthogonal approaches","pmids":["26588989"],"is_preprint":false},{"year":2016,"finding":"NLK phosphorylates YAP at Ser128 (both in vitro and in vivo), blocking YAP interaction with 14-3-3 and enhancing YAP nuclear localization and transcriptional activity. This is distinct from LATS-mediated Ser127 phosphorylation. Depletion of NLK increases YAP pSer127 and reduces YAP reporter activity. In Drosophila, Nemo knockdown reduces Yorkie target gene expression.","method":"In vitro kinase assay, co-immunoprecipitation, nuclear fractionation, luciferase reporter assay, Drosophila genetics","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay, Co-IP, nuclear fractionation, reporter assay, in vivo Drosophila genetics; replicated by independent concurrent study (PMID:27979971)","pmids":["27979972","27979971"],"is_preprint":false},{"year":2016,"finding":"Osmotic stress activates NLK to phosphorylate YAP at Ser128, interfering with 14-3-3 binding even when YAP Ser127 is phosphorylated, resulting in YAP nuclear accumulation and induction of target gene expression, enhancing cellular stress adaptation.","method":"In vitro kinase assay, phosphorylation assay, nuclear/cytoplasmic fractionation, target gene expression analysis, reporter assay","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay, fractionation, reporter, confirmed by concurrent independent study","pmids":["27979971"],"is_preprint":false},{"year":2016,"finding":"NLK phosphorylates HDAC1 at Serine 421 (kinase-inactive NLK fails to do so), and this phosphorylation negatively regulates Wnt signaling. NLK-deficient primary embryonic fibroblasts show sustained β-catenin/Lef1 interaction and elevated Wnt reporter activity.","method":"In vitro kinase assay, catalytically inactive mutant, NLK-knockout mouse cells, luciferase reporter, Co-IP","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with catalytic mutant control, genetic knockout cells, multiple methods in single lab","pmids":["27903773"],"is_preprint":false},{"year":2019,"finding":"NLK interacts with MAVS on mitochondria and peroxisomes and phosphorylates MAVS at multiple sites, inducing MAVS degradation and subsequent inactivation of IRF3, thereby inhibiting antiviral innate immune responses. NLK depletion promotes virus-induced antiviral cytokine production and decreases viral replication in vitro and in vivo.","method":"Co-IP, in vitro kinase/phosphorylation assay, NLK knockdown/reconstitution, mouse viral infection model, IRF3 activation assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, in vitro phosphorylation, genetic depletion and reconstitution, in vivo mouse model, multiple orthogonal methods","pmids":["31324787"],"is_preprint":false},{"year":2014,"finding":"NLK interacts with the IKK-associated complex and disrupts the TAK1-IKKβ interaction, thereby inhibiting IKKβ phosphorylation and blocking TNFα-induced NF-κB activation, p65 nuclear localization, and IκBα degradation.","method":"Co-IP, overexpression, NLK genetic inactivation, NF-κB reporter assay, IKKβ phosphorylation assay","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus NLK inactivation with defined functional readouts, single lab with multiple methods","pmids":["24721172"],"is_preprint":false},{"year":2011,"finding":"ZIPK (zipper-interacting protein kinase) is a novel NLK-binding partner; ZIPK regulates NLK-mediated repression of canonical Wnt/β-catenin signaling and affects the NLK-TCF4 complex formation. ZIPK siRNA reduces Wnt/β-catenin signaling and cell growth.","method":"Co-IP, siRNA knockdown, luciferase reporter assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP and functional reporter with siRNA, single lab","pmids":["21454679"],"is_preprint":false},{"year":2009,"finding":"NLK interacts with SMAD4 (identified by yeast two-hybrid, confirmed by Co-IP in vitro and in vivo) and phosphorylates SMAD4 at Thr9 and Ser138 within the MH1 domain in vitro, via the linker sequence of SMAD4.","method":"Yeast two-hybrid, Co-IP, in vitro kinase assay, phosphorylation site mapping","journal":"Molecular and cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — in vitro kinase assay with site identification, Co-IP, single lab, no functional downstream validation","pmids":["19690946"],"is_preprint":false},{"year":2017,"finding":"The phosphatase WIP1 directly interacts with NLK and dephosphorylates its activation site, thereby inhibiting NLK kinase activity. WIP1-mediated inhibition of NLK markedly decreases LEF1 phosphorylation, enhancing LEF1 interaction with β-catenin and increasing Wnt activity during germ cell development.","method":"Co-IP, in vitro phosphatase assay, NLK kinase activity assay, LEF1 phosphorylation assay, WIP1 knockout mouse embryonic stem cells","journal":"Biochimica et biophysica acta. Molecular basis of disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, in vitro phosphatase/kinase assays, genetic knockout cells, single lab with multiple methods","pmids":["28185954"],"is_preprint":false},{"year":2018,"finding":"NLK interacts with the E2F1 complex and promotes disassembly of the E2F1/HDAC1 complex, diminishing HDAC1's ability to repress E2F1 target genes and boosting cell cycle progression. NLK-deficient colorectal tumor cells show G1/S arrest and reduced E2F1 target gene expression; wild-type but not kinase-mutant NLK restores the phenotype.","method":"Co-IP, NLK deletion, RNA-seq, reporter assay, kinase-mutant rescue experiment","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, genetic deletion, RNA-seq, kinase mutant, single lab","pmids":["29803790"],"is_preprint":false},{"year":2022,"finding":"NLK phosphorylates SRF at serine residues 101/103, enhancing the SRF-ELK association and antagonizing the SRF/MKL pathway, thereby inhibiting myoblast differentiation in vitro. Skeletal muscle-specific Nlk conditional knockout mice show hypertrophic muscle growth with increased muscle and body mass, confirming NLK's role in modulating muscle development in vivo.","method":"In vitro kinase assay, phosphorylation site mutagenesis, Co-IP, Nlk conditional knockout mouse model, muscle phenotype analysis","journal":"Cell death discovery","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay with site mutagenesis, Co-IP, conditional KO mouse model with defined phenotype, multiple orthogonal methods","pmids":["35013153"],"is_preprint":false},{"year":2019,"finding":"NLK interacts with STAT3 and inhibits CCL2 expression by regulating STAT3 phosphorylation and O-GlcNAcylation, thereby inhibiting macrophage recruitment in the tumor microenvironment.","method":"Co-IP, reporter assay, macrophage co-culture assay","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP with limited mechanistic follow-up in a broader circRNA study context","pmids":["38008713"],"is_preprint":false},{"year":2016,"finding":"NLK interacts with the transcription factor STAT1 in cardiomyocytes; NLK transgenic mice show increased STAT1 levels and develop cardiac hypertrophy, fibrosis, and heart failure, while cardiac-specific Nlk deletion protects from cardiac dysfunction. NLK expression is induced by pathological cardiac stimuli.","method":"Cardiac-specific transgenic mice, cardiac-specific Nlk knockout (loxP/Cre), Co-IP, cardiac functional assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic gain- and loss-of-function mouse models with defined cardiac phenotype plus Co-IP, single lab","pmids":["27764156"],"is_preprint":false},{"year":2012,"finding":"NLK is synthetically lethal with PTEN deficiency; this lethality is mediated through FOXO1 (a proposed NLK substrate), as FOXO1 knockdown reverses the selectivity of NLK silencing for PTEN-deficient cells. NLK-depleted PTEN-deficient cells undergo senescence.","method":"High-throughput RNAi screen, isogenic PTEN-deficient cell models, FOXO1 knockdown rescue, senescence assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis by RNAi screen and rescue, isogenic models, single lab","pmids":["23144700"],"is_preprint":false},{"year":2020,"finding":"NLK interacts with 14-3-3ζ (YWHAZ) and prevents its dimerization; this interaction restores E-cadherin expression suppressed by 14-3-3ζ. A non-dissociable 14-3-3ζ dimer cannot be disrupted by NLK, confirming that NLK acts by preventing 14-3-3ζ dimerization.","method":"Co-IP, overexpression, 14-3-3ζ fusion dimer experiment, migration assay, western blot","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP with functional dimer mutant rescue experiment, single lab with multiple methods","pmids":["32236580"],"is_preprint":false},{"year":2002,"finding":"Xenopus NLK (xNLK) interacts with xSox11 in mammalian cells; kinase-inactive xNLK suppresses xSox11-induced neural marker gene expression. xNLK induces the anterior-neural marker Otx-2 and cooperates with xSox11 in neural induction.","method":"Co-IP in mammalian cells, dominant-negative kinase mutant, Xenopus embryo injection, neural marker gene expression assay","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP, kinase-dead mutant in functional assay, Xenopus in vivo, single lab","pmids":["12047350"],"is_preprint":false},{"year":2025,"finding":"USP14 (a deubiquitinase) interacts with NLK and facilitates its deubiquitination, thereby stabilizing NLK activity. This USP14-NLK interaction suppresses Wnt/β-catenin signaling and concurrently activates the NF-κB pathway in macrophages.","method":"Co-IP, USP14 overexpression/knockdown, deubiquitination assay, NF-κB reporter assay, Wnt reporter assay","journal":"Cytokine","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP and deubiquitination assay with functional readouts, single lab","pmids":["41353967"],"is_preprint":false},{"year":2026,"finding":"NLK associates with the N-terminal death effector domains (DEDs, amino acids 1–216) of Caspase-8 and enhances Caspase-8 recruitment and proximity-induced activation within FADD-RIPK1/3-containing PANoptosome complexes. NLK deletion impairs Caspase-8 cleavage and promotes RIPK1-RIPK3 necrosome assembly, redirecting cell death towards necroptosis in macrophages during sepsis.","method":"Co-IP, Nlk conditional knockout mice (Csf1r-iCre), LPS-stimulated bone-marrow-derived macrophages, Caspase-8 cleavage assay, Caspase-8 overexpression rescue, mouse sepsis model","journal":"Clinical and translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping, genetic conditional KO, rescue experiment, in vivo sepsis model, single lab","pmids":["41674095"],"is_preprint":false},{"year":2025,"finding":"NLK promotes mislocalization of TDP43 and other RNA-binding proteins by disrupting nuclear import. NLK levels are elevated in neurons exhibiting TDP43 mislocalization in ALS patient tissues, and genetic reduction of NLK reduces toxicity in human neuron models of ALS.","method":"Human ALS patient tissue analysis, human neuron ALS models, genetic NLK reduction, TDP43 localization assay","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, mechanism of nuclear import disruption not fully detailed in abstract, single study","pmids":["bio_10.1101_2025.01.27.635090"],"is_preprint":true},{"year":2010,"finding":"NLK forms a complex with the histone H3-K9 methyltransferase SETDB1 and suppresses PPARγ action in mesenchymal cells. NLK suppresses osteoblastic differentiation markers (ALP, type I collagen, runx2, osterix, osteocalcin) in a kinase-activity-dependent manner; kinase-inactive NLK fails to suppress differentiation. NLK also suppresses Runx2-driven osteocalcin promoter activity.","method":"Retrovirus-mediated overexpression, kinase-inactive NLK mutant, siRNA knockdown, alkaline phosphatase assay, bone marker gene expression, luciferase reporter assay","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — kinase-inactive mutant dissection plus siRNA and reporter assays, single lab with multiple methods","pmids":["20116374"],"is_preprint":false}],"current_model":"NLK is an evolutionarily conserved proline-directed serine/threonine kinase that acts downstream of the TAK1 MAP3K (activated by TGF-β, Wnt-5a/CaMKII, and other stimuli) to phosphorylate multiple substrates—including TCF/LEF factors (inhibiting β-catenin-TCF DNA binding), LEF1 (positively activating transcription in neural progenitors), YAP (Ser128, blocking 14-3-3 binding and promoting nuclear localization), Raptor (Ser863, disrupting Rag GTPase interaction to inhibit mTORC1), STAT3 (serine phosphorylation promoting mesoderm induction), MAVS (promoting degradation to suppress antiviral signaling), SRF (Ser101/103, shifting SRF from MKL to ELK co-activation), c-Myb/A-Myb (regulating degradation or CBP association), HDAC1 (Ser421, negatively regulating Wnt), Caspase-8 (enhancing PANoptosis), and SMAD4 (Thr9/Ser138)—with its activity modulated by upstream regulators including TAB2 (scaffold), WIP1 (dephosphorylation/inactivation), and USP14 (deubiquitination/stabilization), and it localizes predominantly to the nucleus where it coordinates transcriptional outcomes across Wnt/β-catenin, Hippo/YAP, mTOR, NF-κB, circadian clock, innate immune, and cytoskeletal signaling pathways."},"narrative":{"mechanistic_narrative":"NLK is an evolutionarily conserved, predominantly nuclear proline-directed serine/threonine kinase that acts as a signal-integrating node downstream of the TAK1 MAP3K to phosphorylate transcriptional regulators and thereby tune developmental and stress-response programs [PMID:10391247, PMID:9448268]. Its activation is scaffolded by TAB2, which bridges TAK1 and NLK and is required for TAK1-dependent NLK activation upon Wnt3a stimulation [PMID:20194509], and its activity is set bidirectionally by the phosphatase WIP1 (which dephosphorylates the activation site to inactivate NLK) and the deubiquitinase USP14 (which stabilizes NLK) [PMID:28185954, PMID:41353967]. NLK was first defined as a negative regulator of canonical Wnt/β-catenin signaling: acting downstream of TAK1 (and of the Wnt-5a/Ca2+/CaMKII branch), it phosphorylates TCF/LEF factors to block β-catenin–TCF DNA binding, and promotes ubiquitin-dependent degradation of TCF/LEF via the RING ligase NARF and of c-Myb via HIPK2 and SCF^Fbxw7α [PMID:10391247, PMID:12482967, PMID:16714285, PMID:15082531, PMID:18765672]. In a context-dependent reversal, NLK phosphorylates LEF1 downstream of Dishevelled in neural progenitors to dissociate LEF1 from HDAC and activate transcription, and phosphorylates HDAC1 at Ser421 to repress Wnt output [PMID:22373574, PMID:27903773]. Beyond Wnt, NLK phosphorylates substrates that reprogram multiple pathways: YAP at Ser128 to block 14-3-3 binding and drive nuclear YAP accumulation under osmotic stress [PMID:27979972, PMID:27979971]; Raptor at Ser863 to disrupt the Rag-GTPase interaction and inhibit mTORC1 lysosomal recruitment during stress [PMID:26588989]; STAT3 at serine residues to enable TGF-β/activin mesoderm induction [PMID:15004007]; SRF at Ser101/103 to shift it from MKL toward ELK co-activation and restrain myoblast differentiation in vivo [PMID:35013153]; and PERIOD in the Drosophila circadian clock to set clock speed [PMID:21514639]. NLK also restrains innate immune and inflammatory signaling, phosphorylating MAVS to promote its degradation and suppress antiviral IRF3 activation, and disrupting the TAK1–IKKβ interaction to block TNFα-induced NF-κB activation [PMID:31324787, PMID:24721172]. In macrophages it scaffolds Caspase-8 within FADD-RIPK1/3 PANoptosome complexes to favor apoptotic/PANoptotic cleavage over necroptosis [PMID:41674095].","teleology":[{"year":1998,"claim":"Establishing NLK as a bona fide autophosphorylating serine/threonine kinase with a defined catalytic lysine and a predominantly nuclear distribution set the biochemical foundation for all later substrate work.","evidence":"Autophosphorylation kinase assays with ATP-binding (K155M) and activation-loop mutants, plus subcellular fractionation and immunofluorescence in murine cells","pmids":["9448268"],"confidence":"High","gaps":["No physiological substrate identified at this stage","Upstream activator not yet defined"]},{"year":1999,"claim":"Linking NLK to the TAK1 cascade and showing it phosphorylates TCF/LEF to block β-catenin–TCF DNA binding answered how a kinase could antagonize Wnt signaling at the transcriptional endpoint.","evidence":"In vitro kinase assay, Xenopus axis-duplication injection, reporter and DNA-binding assays","pmids":["10391247"],"confidence":"High","gaps":["Did not define the upstream stimulus activating TAK1-NLK","Phosphosites on TCF/LEF not mapped here"]},{"year":2003,"claim":"Identifying the Wnt-5a/Ca2+/CaMKII branch as an upstream activator placed NLK at the convergence of non-canonical and canonical Wnt inputs.","evidence":"Kinase assays, chimeric Rfz-2 receptor stimulation, and reporter assays in HEK293 cells","pmids":["12482967"],"confidence":"High","gaps":["How CaMKII connects mechanistically to TAK1 not resolved","Other upstream stimuli not surveyed"]},{"year":2004,"claim":"Demonstrating NLK-driven ubiquitination/degradation of c-Myb (with HIPK2) and serine phosphorylation of STAT3 expanded NLK's substrate repertoire beyond TCF/LEF and into developmental induction.","evidence":"Co-IP, in vitro kinase assays, ubiquitination/proteasome-inhibitor experiments (c-Myb); kinase assay plus Xenopus morpholino depletion (STAT3)","pmids":["15082531","15004007"],"confidence":"High","gaps":["E3 ligase for c-Myb not yet identified","STAT3 phosphosites not mapped"]},{"year":2006,"claim":"Identifying NARF as an NLK-associated E3 ligase that ubiquitylates TCF/LEF explained how NLK couples phosphorylation to substrate degradation in Wnt suppression.","evidence":"Yeast two-hybrid, reciprocal Co-IP, in vitro ubiquitylation reconstitution, Xenopus axis-duplication assay","pmids":["16714285"],"confidence":"High","gaps":["In vivo requirement of NARF for endogenous Wnt regulation not established"]},{"year":2008,"claim":"Showing that NLK phosphorylation of c-Myb enhances its recognition by SCF^Fbxw7α defined the degradation machinery for an NLK substrate and a phospho-degron logic.","evidence":"Co-IP, in vitro ubiquitination, phosphosite-mutant binding assays, siRNA knockdown","pmids":["18765672"],"confidence":"High","gaps":["Whether Fbxw7α acts on other NLK substrates not tested"]},{"year":2010,"claim":"Defining TAB2 as the scaffold bridging TAK1 and NLK answered how the kinase is recruited and activated within the Wnt-responsive complex.","evidence":"Reciprocal Co-IP, domain mapping (TAB2 residues 292–417), siRNA knockdown, ubiquitylation and kinase assays with Wnt3a stimulation","pmids":["20194509"],"confidence":"High","gaps":["Structural basis of the TAK1-TAB2-NLK complex unresolved","Whether TAB2 governs non-Wnt NLK functions untested"]},{"year":2011,"claim":"Cross-species work revealed NLK as a clock-setting kinase (PERIOD phosphorylation in Drosophila) and a Wnt-independent cytoskeletal/glial regulator (LIT-1 binding actin and WASP in C. elegans), broadening its functional scope.","evidence":"Drosophila genetic epistasis and phosphosite mapping (PER); C. elegans genetic screen, EM, yeast two-hybrid and Co-IP (LIT-1)","pmids":["21514639","21857800"],"confidence":"High","gaps":["Mammalian circadian role of NLK not demonstrated","Direct actin/WASP binding by mammalian NLK not shown"]},{"year":2012,"claim":"Discovering that NLK can positively activate Wnt by phosphorylating LEF1 to release it from HDAC, downstream of Dishevelled, established context-dependent bidirectionality in NLK's Wnt output.","evidence":"Zebrafish morpholino knockdown, epistasis, in vitro kinase assay, Co-IP, reporter assay in neural progenitors","pmids":["22373574"],"confidence":"High","gaps":["What determines positive vs negative Wnt outcome not defined","LEF1 phosphosites not fully mapped"]},{"year":2015,"claim":"Identifying Raptor Ser863 as an NLK target that disrupts Rag-GTPase binding placed NLK as a stress-responsive inhibitor of mTORC1 lysosomal recruitment.","evidence":"In vitro kinase assay, phosphosite mutagenesis, Co-IP, lysosomal fractionation, Nlk knockout and S863 knock-in mouse cells","pmids":["26588989"],"confidence":"High","gaps":["How stress signals activate NLK toward Raptor not defined"]},{"year":2016,"claim":"Defining YAP Ser128 phosphorylation (blocking 14-3-3 binding) and HDAC1 Ser421 phosphorylation connected NLK to Hippo/YAP and refined its Wnt-repressive mechanism.","evidence":"In vitro kinase assays, Co-IP, nuclear fractionation, reporter assays, Drosophila genetics (YAP); kinase assay with catalytic mutant and NLK-knockout cells (HDAC1); independent concurrent replication of YAP finding","pmids":["27979972","27979971","27903773"],"confidence":"High","gaps":["How osmotic stress directs NLK toward YAP vs other substrates unresolved"]},{"year":2014,"claim":"Showing NLK disrupts the TAK1-IKKβ interaction to block TNFα-induced NF-κB defined a kinase-substrate-independent, scaffold-disruption mode of NLK action in inflammatory signaling.","evidence":"Co-IP, overexpression, NLK genetic inactivation, NF-κB reporter and IKKβ phosphorylation assays","pmids":["24721172"],"confidence":"Medium","gaps":["Whether NLK kinase activity is required for IKKβ inhibition not clarified","Endogenous physiological context limited"]},{"year":2019,"claim":"Establishing that NLK phosphorylates MAVS to drive its degradation positioned NLK as a negative regulator of antiviral innate immunity.","evidence":"Co-IP, in vitro phosphorylation, NLK knockdown/reconstitution, IRF3 readouts, mouse viral infection model","pmids":["31324787"],"confidence":"High","gaps":["MAVS phosphosites and the responsible E3 ligase not defined"]},{"year":2022,"claim":"Identifying SRF Ser101/103 phosphorylation that shifts SRF from MKL to ELK co-activation, with a muscle phenotype in conditional knockouts, defined NLK's role in restraining myogenic differentiation in vivo.","evidence":"In vitro kinase assay, phosphosite mutagenesis, Co-IP, skeletal-muscle-specific Nlk conditional knockout mice","pmids":["35013153"],"confidence":"High","gaps":["Upstream signal directing NLK to SRF in muscle not defined"]},{"year":2025,"claim":"Defining WIP1 and USP14 as negative and positive regulators of NLK stability/activity, respectively, clarified how NLK output is tuned post-translationally across Wnt and NF-κB contexts.","evidence":"Co-IP, in vitro phosphatase/kinase assays, WIP1-knockout cells (WIP1); Co-IP, deubiquitination and reporter assays (USP14)","pmids":["28185954","41353967"],"confidence":"Medium","gaps":["The ubiquitin ligase counteracting USP14 on NLK unidentified","USP14-NLK study is single-lab with limited mechanistic depth"]},{"year":2026,"claim":"Showing NLK scaffolds Caspase-8 within PANoptosome complexes to bias cell death away from necroptosis extended NLK into programmed cell death control in macrophages.","evidence":"Co-IP with DED domain mapping, Csf1r-iCre Nlk conditional knockout mice, Caspase-8 cleavage and rescue assays, mouse sepsis model","pmids":["41674095"],"confidence":"Medium","gaps":["Whether NLK kinase activity (vs scaffolding) is required not resolved","Direct Caspase-8 phosphorylation not demonstrated"]},{"year":null,"claim":"It remains unresolved what determines NLK substrate selection and the positive-versus-negative direction of its outputs across the many pathways it touches, and whether a unifying activation logic links its Wnt, Hippo, mTOR, immune, and cell-death roles.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of substrate recognition","No comprehensive phosphoproteomic substrate map","Context determinants of positive vs negative regulation undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,4,13,14,16,23,17,20,10]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[1,3,13,14]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[1]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,12,22]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[17]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,2,12,14,13]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,3,4,16,22,23]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[17,18,30]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4,12,23,28]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[30]},{"term_id":"R-HSA-9909396","term_label":"Circadian clock","supporting_discovery_ids":[10]}],"complexes":["TAK1-TAB2-NLK complex","PANoptosome (FADD-RIPK1/3-Caspase-8)"],"partners":["TAK1","TAB2","TCF/LEF (LEF1)","YAP","MAVS","WIP1","USP14","HIPK2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UBE8","full_name":"Serine/threonine-protein kinase NLK","aliases":["Nemo-like kinase","Protein LAK1"],"length_aa":527,"mass_kda":58.3,"function":"Serine/threonine-protein kinase that regulates a number of transcription factors with key roles in cell fate determination (PubMed:12482967, PubMed:14960582, PubMed:15004007, PubMed:15764709, PubMed:20061393, PubMed:20874444, PubMed:21454679). Positive effector of the non-canonical Wnt signaling pathway, acting downstream of WNT5A, MAP3K7/TAK1 and HIPK2 (PubMed:15004007, PubMed:15764709). Negative regulator of the canonical Wnt/beta-catenin signaling pathway (PubMed:12482967). Binds to and phosphorylates TCF7L2/TCF4 and LEF1, promoting the dissociation of the TCF7L2/LEF1/beta-catenin complex from DNA, as well as the ubiquitination and subsequent proteolysis of LEF1 (PubMed:21454679). Together these effects inhibit the transcriptional activation of canonical Wnt/beta-catenin target genes (PubMed:12482967, PubMed:21454679). Negative regulator of the Notch signaling pathway (PubMed:20118921). Binds to and phosphorylates NOTCH1, thereby preventing the formation of a transcriptionally active ternary complex of NOTCH1, RBPJ/RBPSUH and MAML1 (PubMed:20118921). Negative regulator of the MYB family of transcription factors (PubMed:15082531). Phosphorylation of MYB leads to its subsequent proteolysis while phosphorylation of MYBL1 and MYBL2 inhibits their interaction with the coactivator CREBBP (PubMed:15082531). Other transcription factors may also be inhibited by direct phosphorylation of CREBBP itself (PubMed:15082531). Acts downstream of IL6 and MAP3K7/TAK1 to phosphorylate STAT3, which is in turn required for activation of NLK by MAP3K7/TAK1 (PubMed:15004007, PubMed:15764709). Upon IL1B stimulus, cooperates with ATF5 to activate the transactivation activity of C/EBP subfamily members (PubMed:25512613). Phosphorylates ATF5 but also stabilizes ATF5 protein levels in a kinase-independent manner (PubMed:25512613). Acts as an inhibitor of the mTORC1 complex in response to osmotic stress by mediating phosphorylation of RPTOR, thereby preventing recruitment of the mTORC1 complex to lysosomes (PubMed:26588989)","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9UBE8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NLK","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NLK","total_profiled":1310},"omim":[{"mim_id":"616319","title":"RING FINGER PROTEIN 138; RNF138","url":"https://www.omim.org/entry/616319"},{"mim_id":"611020","title":"MICRO RNA 21; MIR21","url":"https://www.omim.org/entry/611020"},{"mim_id":"609477","title":"SINGLE-PASS MEMBRANE PROTEIN WITH COILED-COIL DOMAINS 4; SMCO4","url":"https://www.omim.org/entry/609477"},{"mim_id":"609476","title":"NEMO-LIKE KINASE; NLK","url":"https://www.omim.org/entry/609476"},{"mim_id":"605801","title":"RALA-BINDING PROTEIN 1; RALBP1","url":"https://www.omim.org/entry/605801"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Nucleoli","reliability":"Additional"},{"location":"Cell Junctions","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"retina","ntpm":72.8}],"url":"https://www.proteinatlas.org/search/NLK"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q9UBE8","domains":[{"cath_id":"3.30.200.20","chopping":"141-220_472-504","consensus_level":"high","plddt":89.0896,"start":141,"end":504},{"cath_id":"1.10.510.10","chopping":"224-449","consensus_level":"high","plddt":93.4084,"start":224,"end":449}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UBE8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UBE8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UBE8-F1-predicted_aligned_error_v6.png","plddt_mean":75.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NLK","jax_strain_url":"https://www.jax.org/strain/search?query=NLK"},"sequence":{"accession":"Q9UBE8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UBE8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UBE8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UBE8"}},"corpus_meta":[{"pmid":"10391247","id":"PMC_10391247","title":"The 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immunology","url":"https://pubmed.ncbi.nlm.nih.gov/35231467","citation_count":6,"is_preprint":false},{"pmid":"32236580","id":"PMC_32236580","title":"NLK interacts with 14‑3‑3ζ to restore the expression of E‑cadherin.","date":"2020","source":"Oncology reports","url":"https://pubmed.ncbi.nlm.nih.gov/32236580","citation_count":6,"is_preprint":false},{"pmid":"23983589","id":"PMC_23983589","title":"Lentivirus-based RNA silencing of Nemo-like kinase (NLK) inhibits the CAL 27 human adenosquamos carcinoma cells proliferation and blocks G0/G1 phase to S phase.","date":"2013","source":"International journal of medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/23983589","citation_count":6,"is_preprint":false},{"pmid":"35013153","id":"PMC_35013153","title":"NLK is required for Ras/ERK/SRF/ELK signaling to tune skeletal muscle development by phosphorylating SRF and antagonizing the SRF/MKL pathway.","date":"2022","source":"Cell death discovery","url":"https://pubmed.ncbi.nlm.nih.gov/35013153","citation_count":4,"is_preprint":false},{"pmid":"11376940","id":"PMC_11376940","title":"The minisatellite of the GPI/AMF/NLK/MF gene: interspecies conservation and transcriptional activity.","date":"2001","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/11376940","citation_count":4,"is_preprint":false},{"pmid":"34729110","id":"PMC_34729110","title":"The expression of NLK is functionally associated with colorectal cancers (CRC).","date":"2021","source":"Journal of Cancer","url":"https://pubmed.ncbi.nlm.nih.gov/34729110","citation_count":3,"is_preprint":false},{"pmid":"41674095","id":"PMC_41674095","title":"NLK facilitates Caspase-8 activation to drive macrophage PANoptosis in sepsis.","date":"2026","source":"Clinical and translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/41674095","citation_count":3,"is_preprint":false},{"pmid":"40578571","id":"PMC_40578571","title":"The exosomal miRNA-3184-3p derived from highly metastatic melanoma cells promotes metastatic competency via the positive feedback loop of NLK/Wnt/S100A11.","date":"2025","source":"Biochemical pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/40578571","citation_count":2,"is_preprint":false},{"pmid":"41922900","id":"PMC_41922900","title":"Tim-3 agonist restrains ILC2 function and attenuates airway hyperreactivity via NLK pathway.","date":"2026","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/41922900","citation_count":1,"is_preprint":false},{"pmid":"41390118","id":"PMC_41390118","title":"Grain proteins ameliorate glucose metabolism disorders by activating intestinal AhR and the hepatic NLK/FOXO1 pathway via gut microbiota-derived indole metabolites.","date":"2025","source":"Journal of advanced research","url":"https://pubmed.ncbi.nlm.nih.gov/41390118","citation_count":1,"is_preprint":false},{"pmid":"34595271","id":"PMC_34595271","title":"In vitro NLK Kinase Assay.","date":"2017","source":"Bio-protocol","url":"https://pubmed.ncbi.nlm.nih.gov/34595271","citation_count":1,"is_preprint":false},{"pmid":"41573688","id":"PMC_41573688","title":"Crosstalk of Nemo-Like Kinase (NLK) and Yes-Associated Protein (YAP) Phosphorylation in Endometrial Epithelial Cells.","date":"2025","source":"Development & reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/41573688","citation_count":0,"is_preprint":false},{"pmid":"40280200","id":"PMC_40280200","title":"NLK knockdown in hBMSCs enhance repair of critical-size bone defects by modulating neurogenic and osteogenic differentiation.","date":"2025","source":"Biochimica et biophysica acta. Molecular basis of disease","url":"https://pubmed.ncbi.nlm.nih.gov/40280200","citation_count":0,"is_preprint":false},{"pmid":"41365991","id":"PMC_41365991","title":"Evolutionary analysis through structural modeling of FAM222 proteins reveals a novel disordered conserved domain in vertebrates that interacts with NLK.","date":"2025","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/41365991","citation_count":0,"is_preprint":false},{"pmid":"41353967","id":"PMC_41353967","title":"Macrophage USP14 suppresses Wnt/β-catenin signaling via NLK deubiquitination to enhance immune response.","date":"2025","source":"Cytokine","url":"https://pubmed.ncbi.nlm.nih.gov/41353967","citation_count":0,"is_preprint":false},{"pmid":"41235675","id":"PMC_41235675","title":"[Retracted] MicroRNA‑92b promotes tumor growth and activation of NF‑κB signaling via regulation of NLK in oral squamous cell carcinoma.","date":"2025","source":"Oncology reports","url":"https://pubmed.ncbi.nlm.nih.gov/41235675","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.01.27.635090","title":"Nemo-like kinase disrupts nuclear import and drives TDP43 mislocalization in ALS","date":"2025-01-28","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.27.635090","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.07.01.601538","title":"EFL-3/E2F7 modulates Wnt signalling through repressing the LIT-1 Nemo-like kinase during asymmetric epidermal cell division in  <i>Caenorhabditis elegans</i>","date":"2024-07-03","source":"bioRxiv","url":"https://doi.org/10.1101/2024.07.01.601538","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":34746,"output_tokens":8309,"usd":0.114436,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":17930,"output_tokens":5628,"usd":0.115175,"stage2_stop_reason":"end_turn"},"total_usd":0.229611,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"TAK1 activation stimulates NLK kinase activity, and NLK phosphorylates TCF/LEF transcription factors, inhibiting the interaction of the β-catenin-TCF complex with DNA, thereby negatively regulating the Wnt/β-catenin signaling pathway. Injection of NLK suppresses β-catenin-induced axis duplication in Xenopus embryos.\",\n      \"method\": \"In vitro kinase assay, Xenopus microinjection, transcriptional reporter assay, DNA-binding assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (in vitro kinase assay, embryo injection, DNA-binding assay), replicated across subsequent studies\",\n      \"pmids\": [\"10391247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Murine NLK (Nlk) is a serine/threonine kinase that autophosphorylates; mutation of the ATP-binding Lys-155 to methionine or the activating threonine in kinase domain VIII abolishes autophosphorylation. NLK localizes predominantly to the nucleus (60–70%) with 30–40% cytoplasmic.\",\n      \"method\": \"Autophosphorylation kinase assay, site-directed mutagenesis, subcellular fractionation, immunofluorescence microscopy\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with mutagenesis plus direct localization by fractionation and immunofluorescence, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"9448268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The Wnt-5a/Ca2+ pathway activates CaMKII, which in turn stimulates the TAK1-NLK cascade. Wnt-5a overexpression in HEK293 cells activates NLK through TAK1, and activation of the chimeric receptor Rfz-2 activates endogenous CaMKII, TAK1, and NLK, inhibiting β-catenin-induced transcriptional activation.\",\n      \"method\": \"Kinase activity assay, chimeric receptor stimulation, transcriptional reporter assay, overexpression in HEK293 cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (kinase assays, chimeric receptor, reporter assay), replicated across labs\",\n      \"pmids\": [\"12482967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NLK binds directly to c-Myb together with HIPK2, phosphorylates c-Myb at multiple sites, leading to its ubiquitination and proteasome-dependent degradation in response to Wnt-1 signaling via the TAK1-HIPK2-NLK pathway.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, ubiquitination assay, proteasome inhibitor experiments\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct binding confirmed by Co-IP, phosphorylation by in vitro kinase assay, degradation by proteasome inhibition, single lab with multiple methods\",\n      \"pmids\": [\"15082531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The TAK1-NLK cascade phosphorylates STAT3 at serine residues; this phosphorylation is essential for TGF-β/activin-mediated mesoderm induction in Xenopus. Activin activates NLK, which directly phosphorylates STAT3.\",\n      \"method\": \"In vitro kinase assay, Xenopus morpholino depletion, co-expression rescue experiments, phosphorylation assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro phosphorylation of STAT3 by NLK, genetic depletion phenotype, multiple methods in single lab\",\n      \"pmids\": [\"15004007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NLK associates with NARF (NLK-associated RING finger protein), an E3 ubiquitin ligase that uses E2-25K to ubiquitylate TCF/LEF. NLK kinase activity augments NARF binding and ubiquitylation of TCF/LEF, leading to proteasomal degradation of TCF/LEF and suppression of Wnt/β-catenin signaling.\",\n      \"method\": \"Yeast two-hybrid, Co-IP, in vitro ubiquitylation assay, Xenopus axis duplication assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ubiquitylation reconstitution, reciprocal Co-IP, and Xenopus functional assay in single lab\",\n      \"pmids\": [\"16714285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"NLK phosphorylates A-Myb (but does not induce its degradation), inhibits the association between A-Myb and the coactivator CBP, and induces methylation of histone H3 at lysine-9 at A-Myb-bound promoters. NLK and HIPK2 both bind directly to A-Myb.\",\n      \"method\": \"Co-IP, in vitro kinase assay, chromatin immunoprecipitation, transcriptional reporter assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods (Co-IP, kinase assay, ChIP, reporter) in single lab\",\n      \"pmids\": [\"16055500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Fbxw7α (F-box protein of SCF complex) directly binds c-Myb via its WD40 domain and induces c-Myb ubiquitination in a Wnt-1- and NLK-dependent manner. NLK phosphorylation of c-Myb enhances the c-Myb/Fbxw7α interaction; a c-Myb phosphorylation-site mutant fails to interact with Fbxw7α. NLK also binds Cul1 (SCF component).\",\n      \"method\": \"Co-IP, in vitro ubiquitination assay, mutant binding assay, siRNA knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ubiquitination reconstitution, Co-IP, phosphorylation-site mutant analysis, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"18765672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"HMG2L1 is an NLK-interacting protein identified by yeast two-hybrid screening; interaction confirmed in mammalian cells. HMG2L1 negatively regulates Wnt/β-catenin signaling, inhibiting β-catenin-stimulated transcriptional activity and Wnt-induced axis duplication in Xenopus.\",\n      \"method\": \"Yeast two-hybrid, Co-IP in mammalian cells, Xenopus axis duplication assay, transcriptional reporter assay\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid plus Co-IP and functional Xenopus assay, single lab\",\n      \"pmids\": [\"12875653\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TAB2 directly interacts with NLK and functions as a scaffold protein to facilitate the interaction between TAK1 and NLK. The intermediate region (residues 292–417) of TAB2 mediates NLK binding. TAB2 knockdown abolishes the TAK1-NLK interaction and NLK activation; TAB2 mediates TAK1-dependent NLK activation and LEF1 polyubiquitylation, inhibiting canonical Wnt signaling. Wnt3a stimulation increases the TAK1-TAB2-NLK complex.\",\n      \"method\": \"Co-IP, siRNA knockdown, domain-mapping mutant analysis, ubiquitylation assay, kinase assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, domain mapping, functional ubiquitylation and kinase assays, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"20194509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NLK phosphorylates the PERIOD (PER) protein at the 'per-short' domain in Drosophila, initiating a hierarchical phosphorylation cascade: NLK/NEMO phosphorylation at the per-short domain stimulates DOUBLETIME (DBT/CK1δ/ε) phosphorylation at nearby sites, delaying progressive DBT phosphorylation at distal sites required for SLIMB/β-TrCP recognition and proteasomal degradation, thereby setting circadian clock speed.\",\n      \"method\": \"Genetic epistasis in Drosophila, in vitro kinase assay, phosphorylation site mapping, mutant analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (genetics, in vitro kinase assay, phosphorylation mapping), published in high-impact journal with rigorous mechanistic dissection\",\n      \"pmids\": [\"21514639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"LIT-1 (C. elegans NLK ortholog) acts within glia to promote sensory compartment expansion in a Wnt-independent manner. LIT-1 localizes to the glial sensory compartment via its conserved C-terminus, which binds both actin and the Wnt-Aldrich syndrome protein (WASP) by two-hybrid and Co-IP. LIT-1 C-terminus localization requires neuronal signals and is necessary for its function.\",\n      \"method\": \"Genetic suppressor screen, electron microscopy reconstruction, yeast two-hybrid, Co-IP, fluorescence microscopy, fluorescence EM\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis, EM, Co-IP, yeast two-hybrid, and direct localization with functional consequence, multiple orthogonal methods\",\n      \"pmids\": [\"21857800\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NLK (Nlk2 in zebrafish) positively regulates Wnt/β-catenin signaling by phosphorylating LEF1, which causes LEF1 dissociation from HDAC, enabling transcriptional activation. NLK functions downstream of Dishevelled (Dvl) in Wnt/β-catenin signaling in neural progenitor cells.\",\n      \"method\": \"Zebrafish morpholino knockdown, epistasis analysis, in vitro kinase assay, Co-IP, reporter assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro kinase assay, genetic epistasis in zebrafish, Co-IP, reporter, multiple methods across species\",\n      \"pmids\": [\"22373574\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"NLK phosphorylates Raptor at Ser863, disrupting its interaction with Rag GTPase, which is required for mTORC1 lysosomal recruitment. This inhibits mTORC1 lysosomal localization and suppresses mTORC1 activation in response to osmotic and oxidative stress. Cells with Nlk deletion or Raptor S863 phosphorylation-site knock-in are defective in rapid mTORC1 inhibition upon osmotic stress.\",\n      \"method\": \"In vitro kinase assay, phosphorylation site mutagenesis, Co-IP, lysosomal fractionation, Nlk knockout and knock-in mouse cells, mTORC1 activity assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay with mutagenesis, genetic knockout/knock-in validation, Co-IP, subcellular fractionation, multiple orthogonal approaches\",\n      \"pmids\": [\"26588989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NLK phosphorylates YAP at Ser128 (both in vitro and in vivo), blocking YAP interaction with 14-3-3 and enhancing YAP nuclear localization and transcriptional activity. This is distinct from LATS-mediated Ser127 phosphorylation. Depletion of NLK increases YAP pSer127 and reduces YAP reporter activity. In Drosophila, Nemo knockdown reduces Yorkie target gene expression.\",\n      \"method\": \"In vitro kinase assay, co-immunoprecipitation, nuclear fractionation, luciferase reporter assay, Drosophila genetics\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay, Co-IP, nuclear fractionation, reporter assay, in vivo Drosophila genetics; replicated by independent concurrent study (PMID:27979971)\",\n      \"pmids\": [\"27979972\", \"27979971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Osmotic stress activates NLK to phosphorylate YAP at Ser128, interfering with 14-3-3 binding even when YAP Ser127 is phosphorylated, resulting in YAP nuclear accumulation and induction of target gene expression, enhancing cellular stress adaptation.\",\n      \"method\": \"In vitro kinase assay, phosphorylation assay, nuclear/cytoplasmic fractionation, target gene expression analysis, reporter assay\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay, fractionation, reporter, confirmed by concurrent independent study\",\n      \"pmids\": [\"27979971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NLK phosphorylates HDAC1 at Serine 421 (kinase-inactive NLK fails to do so), and this phosphorylation negatively regulates Wnt signaling. NLK-deficient primary embryonic fibroblasts show sustained β-catenin/Lef1 interaction and elevated Wnt reporter activity.\",\n      \"method\": \"In vitro kinase assay, catalytically inactive mutant, NLK-knockout mouse cells, luciferase reporter, Co-IP\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with catalytic mutant control, genetic knockout cells, multiple methods in single lab\",\n      \"pmids\": [\"27903773\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NLK interacts with MAVS on mitochondria and peroxisomes and phosphorylates MAVS at multiple sites, inducing MAVS degradation and subsequent inactivation of IRF3, thereby inhibiting antiviral innate immune responses. NLK depletion promotes virus-induced antiviral cytokine production and decreases viral replication in vitro and in vivo.\",\n      \"method\": \"Co-IP, in vitro kinase/phosphorylation assay, NLK knockdown/reconstitution, mouse viral infection model, IRF3 activation assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, in vitro phosphorylation, genetic depletion and reconstitution, in vivo mouse model, multiple orthogonal methods\",\n      \"pmids\": [\"31324787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NLK interacts with the IKK-associated complex and disrupts the TAK1-IKKβ interaction, thereby inhibiting IKKβ phosphorylation and blocking TNFα-induced NF-κB activation, p65 nuclear localization, and IκBα degradation.\",\n      \"method\": \"Co-IP, overexpression, NLK genetic inactivation, NF-κB reporter assay, IKKβ phosphorylation assay\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus NLK inactivation with defined functional readouts, single lab with multiple methods\",\n      \"pmids\": [\"24721172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ZIPK (zipper-interacting protein kinase) is a novel NLK-binding partner; ZIPK regulates NLK-mediated repression of canonical Wnt/β-catenin signaling and affects the NLK-TCF4 complex formation. ZIPK siRNA reduces Wnt/β-catenin signaling and cell growth.\",\n      \"method\": \"Co-IP, siRNA knockdown, luciferase reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP and functional reporter with siRNA, single lab\",\n      \"pmids\": [\"21454679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NLK interacts with SMAD4 (identified by yeast two-hybrid, confirmed by Co-IP in vitro and in vivo) and phosphorylates SMAD4 at Thr9 and Ser138 within the MH1 domain in vitro, via the linker sequence of SMAD4.\",\n      \"method\": \"Yeast two-hybrid, Co-IP, in vitro kinase assay, phosphorylation site mapping\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — in vitro kinase assay with site identification, Co-IP, single lab, no functional downstream validation\",\n      \"pmids\": [\"19690946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The phosphatase WIP1 directly interacts with NLK and dephosphorylates its activation site, thereby inhibiting NLK kinase activity. WIP1-mediated inhibition of NLK markedly decreases LEF1 phosphorylation, enhancing LEF1 interaction with β-catenin and increasing Wnt activity during germ cell development.\",\n      \"method\": \"Co-IP, in vitro phosphatase assay, NLK kinase activity assay, LEF1 phosphorylation assay, WIP1 knockout mouse embryonic stem cells\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, in vitro phosphatase/kinase assays, genetic knockout cells, single lab with multiple methods\",\n      \"pmids\": [\"28185954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NLK interacts with the E2F1 complex and promotes disassembly of the E2F1/HDAC1 complex, diminishing HDAC1's ability to repress E2F1 target genes and boosting cell cycle progression. NLK-deficient colorectal tumor cells show G1/S arrest and reduced E2F1 target gene expression; wild-type but not kinase-mutant NLK restores the phenotype.\",\n      \"method\": \"Co-IP, NLK deletion, RNA-seq, reporter assay, kinase-mutant rescue experiment\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, genetic deletion, RNA-seq, kinase mutant, single lab\",\n      \"pmids\": [\"29803790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NLK phosphorylates SRF at serine residues 101/103, enhancing the SRF-ELK association and antagonizing the SRF/MKL pathway, thereby inhibiting myoblast differentiation in vitro. Skeletal muscle-specific Nlk conditional knockout mice show hypertrophic muscle growth with increased muscle and body mass, confirming NLK's role in modulating muscle development in vivo.\",\n      \"method\": \"In vitro kinase assay, phosphorylation site mutagenesis, Co-IP, Nlk conditional knockout mouse model, muscle phenotype analysis\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay with site mutagenesis, Co-IP, conditional KO mouse model with defined phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"35013153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NLK interacts with STAT3 and inhibits CCL2 expression by regulating STAT3 phosphorylation and O-GlcNAcylation, thereby inhibiting macrophage recruitment in the tumor microenvironment.\",\n      \"method\": \"Co-IP, reporter assay, macrophage co-culture assay\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP with limited mechanistic follow-up in a broader circRNA study context\",\n      \"pmids\": [\"38008713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NLK interacts with the transcription factor STAT1 in cardiomyocytes; NLK transgenic mice show increased STAT1 levels and develop cardiac hypertrophy, fibrosis, and heart failure, while cardiac-specific Nlk deletion protects from cardiac dysfunction. NLK expression is induced by pathological cardiac stimuli.\",\n      \"method\": \"Cardiac-specific transgenic mice, cardiac-specific Nlk knockout (loxP/Cre), Co-IP, cardiac functional assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic gain- and loss-of-function mouse models with defined cardiac phenotype plus Co-IP, single lab\",\n      \"pmids\": [\"27764156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NLK is synthetically lethal with PTEN deficiency; this lethality is mediated through FOXO1 (a proposed NLK substrate), as FOXO1 knockdown reverses the selectivity of NLK silencing for PTEN-deficient cells. NLK-depleted PTEN-deficient cells undergo senescence.\",\n      \"method\": \"High-throughput RNAi screen, isogenic PTEN-deficient cell models, FOXO1 knockdown rescue, senescence assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis by RNAi screen and rescue, isogenic models, single lab\",\n      \"pmids\": [\"23144700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"NLK interacts with 14-3-3ζ (YWHAZ) and prevents its dimerization; this interaction restores E-cadherin expression suppressed by 14-3-3ζ. A non-dissociable 14-3-3ζ dimer cannot be disrupted by NLK, confirming that NLK acts by preventing 14-3-3ζ dimerization.\",\n      \"method\": \"Co-IP, overexpression, 14-3-3ζ fusion dimer experiment, migration assay, western blot\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP with functional dimer mutant rescue experiment, single lab with multiple methods\",\n      \"pmids\": [\"32236580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Xenopus NLK (xNLK) interacts with xSox11 in mammalian cells; kinase-inactive xNLK suppresses xSox11-induced neural marker gene expression. xNLK induces the anterior-neural marker Otx-2 and cooperates with xSox11 in neural induction.\",\n      \"method\": \"Co-IP in mammalian cells, dominant-negative kinase mutant, Xenopus embryo injection, neural marker gene expression assay\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP, kinase-dead mutant in functional assay, Xenopus in vivo, single lab\",\n      \"pmids\": [\"12047350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"USP14 (a deubiquitinase) interacts with NLK and facilitates its deubiquitination, thereby stabilizing NLK activity. This USP14-NLK interaction suppresses Wnt/β-catenin signaling and concurrently activates the NF-κB pathway in macrophages.\",\n      \"method\": \"Co-IP, USP14 overexpression/knockdown, deubiquitination assay, NF-κB reporter assay, Wnt reporter assay\",\n      \"journal\": \"Cytokine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP and deubiquitination assay with functional readouts, single lab\",\n      \"pmids\": [\"41353967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"NLK associates with the N-terminal death effector domains (DEDs, amino acids 1–216) of Caspase-8 and enhances Caspase-8 recruitment and proximity-induced activation within FADD-RIPK1/3-containing PANoptosome complexes. NLK deletion impairs Caspase-8 cleavage and promotes RIPK1-RIPK3 necrosome assembly, redirecting cell death towards necroptosis in macrophages during sepsis.\",\n      \"method\": \"Co-IP, Nlk conditional knockout mice (Csf1r-iCre), LPS-stimulated bone-marrow-derived macrophages, Caspase-8 cleavage assay, Caspase-8 overexpression rescue, mouse sepsis model\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping, genetic conditional KO, rescue experiment, in vivo sepsis model, single lab\",\n      \"pmids\": [\"41674095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NLK promotes mislocalization of TDP43 and other RNA-binding proteins by disrupting nuclear import. NLK levels are elevated in neurons exhibiting TDP43 mislocalization in ALS patient tissues, and genetic reduction of NLK reduces toxicity in human neuron models of ALS.\",\n      \"method\": \"Human ALS patient tissue analysis, human neuron ALS models, genetic NLK reduction, TDP43 localization assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, mechanism of nuclear import disruption not fully detailed in abstract, single study\",\n      \"pmids\": [\"bio_10.1101_2025.01.27.635090\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NLK forms a complex with the histone H3-K9 methyltransferase SETDB1 and suppresses PPARγ action in mesenchymal cells. NLK suppresses osteoblastic differentiation markers (ALP, type I collagen, runx2, osterix, osteocalcin) in a kinase-activity-dependent manner; kinase-inactive NLK fails to suppress differentiation. NLK also suppresses Runx2-driven osteocalcin promoter activity.\",\n      \"method\": \"Retrovirus-mediated overexpression, kinase-inactive NLK mutant, siRNA knockdown, alkaline phosphatase assay, bone marker gene expression, luciferase reporter assay\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase-inactive mutant dissection plus siRNA and reporter assays, single lab with multiple methods\",\n      \"pmids\": [\"20116374\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NLK is an evolutionarily conserved proline-directed serine/threonine kinase that acts downstream of the TAK1 MAP3K (activated by TGF-β, Wnt-5a/CaMKII, and other stimuli) to phosphorylate multiple substrates—including TCF/LEF factors (inhibiting β-catenin-TCF DNA binding), LEF1 (positively activating transcription in neural progenitors), YAP (Ser128, blocking 14-3-3 binding and promoting nuclear localization), Raptor (Ser863, disrupting Rag GTPase interaction to inhibit mTORC1), STAT3 (serine phosphorylation promoting mesoderm induction), MAVS (promoting degradation to suppress antiviral signaling), SRF (Ser101/103, shifting SRF from MKL to ELK co-activation), c-Myb/A-Myb (regulating degradation or CBP association), HDAC1 (Ser421, negatively regulating Wnt), Caspase-8 (enhancing PANoptosis), and SMAD4 (Thr9/Ser138)—with its activity modulated by upstream regulators including TAB2 (scaffold), WIP1 (dephosphorylation/inactivation), and USP14 (deubiquitination/stabilization), and it localizes predominantly to the nucleus where it coordinates transcriptional outcomes across Wnt/β-catenin, Hippo/YAP, mTOR, NF-κB, circadian clock, innate immune, and cytoskeletal signaling pathways.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NLK is an evolutionarily conserved, predominantly nuclear proline-directed serine/threonine kinase that acts as a signal-integrating node downstream of the TAK1 MAP3K to phosphorylate transcriptional regulators and thereby tune developmental and stress-response programs [#0, #1]. Its activation is scaffolded by TAB2, which bridges TAK1 and NLK and is required for TAK1-dependent NLK activation upon Wnt3a stimulation [#9], and its activity is set bidirectionally by the phosphatase WIP1 (which dephosphorylates the activation site to inactivate NLK) and the deubiquitinase USP14 (which stabilizes NLK) [#21, #29]. NLK was first defined as a negative regulator of canonical Wnt/\\u03b2-catenin signaling: acting downstream of TAK1 (and of the Wnt-5a/Ca2+/CaMKII branch), it phosphorylates TCF/LEF factors to block \\u03b2-catenin\\u2013TCF DNA binding, and promotes ubiquitin-dependent degradation of TCF/LEF via the RING ligase NARF and of c-Myb via HIPK2 and SCF^Fbxw7\\u03b1 [#0, #2, #5, #3, #7]. In a context-dependent reversal, NLK phosphorylates LEF1 downstream of Dishevelled in neural progenitors to dissociate LEF1 from HDAC and activate transcription, and phosphorylates HDAC1 at Ser421 to repress Wnt output [#12, #16]. Beyond Wnt, NLK phosphorylates substrates that reprogram multiple pathways: YAP at Ser128 to block 14-3-3 binding and drive nuclear YAP accumulation under osmotic stress [#14, #15]; Raptor at Ser863 to disrupt the Rag-GTPase interaction and inhibit mTORC1 lysosomal recruitment during stress [#13]; STAT3 at serine residues to enable TGF-\\u03b2/activin mesoderm induction [#4]; SRF at Ser101/103 to shift it from MKL toward ELK co-activation and restrain myoblast differentiation in vivo [#23]; and PERIOD in the Drosophila circadian clock to set clock speed [#10]. NLK also restrains innate immune and inflammatory signaling, phosphorylating MAVS to promote its degradation and suppress antiviral IRF3 activation, and disrupting the TAK1\\u2013IKK\\u03b2 interaction to block TNF\\u03b1-induced NF-\\u03baB activation [#17, #18]. In macrophages it scaffolds Caspase-8 within FADD-RIPK1/3 PANoptosome complexes to favor apoptotic/PANoptotic cleavage over necroptosis [#30].\"\n  ,\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing NLK as a bona fide autophosphorylating serine/threonine kinase with a defined catalytic lysine and a predominantly nuclear distribution set the biochemical foundation for all later substrate work.\",\n      \"evidence\": \"Autophosphorylation kinase assays with ATP-binding (K155M) and activation-loop mutants, plus subcellular fractionation and immunofluorescence in murine cells\",\n      \"pmids\": [\"9448268\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No physiological substrate identified at this stage\", \"Upstream activator not yet defined\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Linking NLK to the TAK1 cascade and showing it phosphorylates TCF/LEF to block \\u03b2-catenin\\u2013TCF DNA binding answered how a kinase could antagonize Wnt signaling at the transcriptional endpoint.\",\n      \"evidence\": \"In vitro kinase assay, Xenopus axis-duplication injection, reporter and DNA-binding assays\",\n      \"pmids\": [\"10391247\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the upstream stimulus activating TAK1-NLK\", \"Phosphosites on TCF/LEF not mapped here\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identifying the Wnt-5a/Ca2+/CaMKII branch as an upstream activator placed NLK at the convergence of non-canonical and canonical Wnt inputs.\",\n      \"evidence\": \"Kinase assays, chimeric Rfz-2 receptor stimulation, and reporter assays in HEK293 cells\",\n      \"pmids\": [\"12482967\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CaMKII connects mechanistically to TAK1 not resolved\", \"Other upstream stimuli not surveyed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrating NLK-driven ubiquitination/degradation of c-Myb (with HIPK2) and serine phosphorylation of STAT3 expanded NLK's substrate repertoire beyond TCF/LEF and into developmental induction.\",\n      \"evidence\": \"Co-IP, in vitro kinase assays, ubiquitination/proteasome-inhibitor experiments (c-Myb); kinase assay plus Xenopus morpholino depletion (STAT3)\",\n      \"pmids\": [\"15082531\", \"15004007\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase for c-Myb not yet identified\", \"STAT3 phosphosites not mapped\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identifying NARF as an NLK-associated E3 ligase that ubiquitylates TCF/LEF explained how NLK couples phosphorylation to substrate degradation in Wnt suppression.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal Co-IP, in vitro ubiquitylation reconstitution, Xenopus axis-duplication assay\",\n      \"pmids\": [\"16714285\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo requirement of NARF for endogenous Wnt regulation not established\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showing that NLK phosphorylation of c-Myb enhances its recognition by SCF^Fbxw7\\u03b1 defined the degradation machinery for an NLK substrate and a phospho-degron logic.\",\n      \"evidence\": \"Co-IP, in vitro ubiquitination, phosphosite-mutant binding assays, siRNA knockdown\",\n      \"pmids\": [\"18765672\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Fbxw7\\u03b1 acts on other NLK substrates not tested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defining TAB2 as the scaffold bridging TAK1 and NLK answered how the kinase is recruited and activated within the Wnt-responsive complex.\",\n      \"evidence\": \"Reciprocal Co-IP, domain mapping (TAB2 residues 292\\u2013417), siRNA knockdown, ubiquitylation and kinase assays with Wnt3a stimulation\",\n      \"pmids\": [\"20194509\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the TAK1-TAB2-NLK complex unresolved\", \"Whether TAB2 governs non-Wnt NLK functions untested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Cross-species work revealed NLK as a clock-setting kinase (PERIOD phosphorylation in Drosophila) and a Wnt-independent cytoskeletal/glial regulator (LIT-1 binding actin and WASP in C. elegans), broadening its functional scope.\",\n      \"evidence\": \"Drosophila genetic epistasis and phosphosite mapping (PER); C. elegans genetic screen, EM, yeast two-hybrid and Co-IP (LIT-1)\",\n      \"pmids\": [\"21514639\", \"21857800\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mammalian circadian role of NLK not demonstrated\", \"Direct actin/WASP binding by mammalian NLK not shown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Discovering that NLK can positively activate Wnt by phosphorylating LEF1 to release it from HDAC, downstream of Dishevelled, established context-dependent bidirectionality in NLK's Wnt output.\",\n      \"evidence\": \"Zebrafish morpholino knockdown, epistasis, in vitro kinase assay, Co-IP, reporter assay in neural progenitors\",\n      \"pmids\": [\"22373574\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"What determines positive vs negative Wnt outcome not defined\", \"LEF1 phosphosites not fully mapped\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identifying Raptor Ser863 as an NLK target that disrupts Rag-GTPase binding placed NLK as a stress-responsive inhibitor of mTORC1 lysosomal recruitment.\",\n      \"evidence\": \"In vitro kinase assay, phosphosite mutagenesis, Co-IP, lysosomal fractionation, Nlk knockout and S863 knock-in mouse cells\",\n      \"pmids\": [\"26588989\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How stress signals activate NLK toward Raptor not defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defining YAP Ser128 phosphorylation (blocking 14-3-3 binding) and HDAC1 Ser421 phosphorylation connected NLK to Hippo/YAP and refined its Wnt-repressive mechanism.\",\n      \"evidence\": \"In vitro kinase assays, Co-IP, nuclear fractionation, reporter assays, Drosophila genetics (YAP); kinase assay with catalytic mutant and NLK-knockout cells (HDAC1); independent concurrent replication of YAP finding\",\n      \"pmids\": [\"27979972\", \"27979971\", \"27903773\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How osmotic stress directs NLK toward YAP vs other substrates unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showing NLK disrupts the TAK1-IKK\\u03b2 interaction to block TNF\\u03b1-induced NF-\\u03baB defined a kinase-substrate-independent, scaffold-disruption mode of NLK action in inflammatory signaling.\",\n      \"evidence\": \"Co-IP, overexpression, NLK genetic inactivation, NF-\\u03baB reporter and IKK\\u03b2 phosphorylation assays\",\n      \"pmids\": [\"24721172\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether NLK kinase activity is required for IKK\\u03b2 inhibition not clarified\", \"Endogenous physiological context limited\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Establishing that NLK phosphorylates MAVS to drive its degradation positioned NLK as a negative regulator of antiviral innate immunity.\",\n      \"evidence\": \"Co-IP, in vitro phosphorylation, NLK knockdown/reconstitution, IRF3 readouts, mouse viral infection model\",\n      \"pmids\": [\"31324787\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"MAVS phosphosites and the responsible E3 ligase not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identifying SRF Ser101/103 phosphorylation that shifts SRF from MKL to ELK co-activation, with a muscle phenotype in conditional knockouts, defined NLK's role in restraining myogenic differentiation in vivo.\",\n      \"evidence\": \"In vitro kinase assay, phosphosite mutagenesis, Co-IP, skeletal-muscle-specific Nlk conditional knockout mice\",\n      \"pmids\": [\"35013153\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signal directing NLK to SRF in muscle not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defining WIP1 and USP14 as negative and positive regulators of NLK stability/activity, respectively, clarified how NLK output is tuned post-translationally across Wnt and NF-\\u03baB contexts.\",\n      \"evidence\": \"Co-IP, in vitro phosphatase/kinase assays, WIP1-knockout cells (WIP1); Co-IP, deubiquitination and reporter assays (USP14)\",\n      \"pmids\": [\"28185954\", \"41353967\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The ubiquitin ligase counteracting USP14 on NLK unidentified\", \"USP14-NLK study is single-lab with limited mechanistic depth\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Showing NLK scaffolds Caspase-8 within PANoptosome complexes to bias cell death away from necroptosis extended NLK into programmed cell death control in macrophages.\",\n      \"evidence\": \"Co-IP with DED domain mapping, Csf1r-iCre Nlk conditional knockout mice, Caspase-8 cleavage and rescue assays, mouse sepsis model\",\n      \"pmids\": [\"41674095\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether NLK kinase activity (vs scaffolding) is required not resolved\", \"Direct Caspase-8 phosphorylation not demonstrated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved what determines NLK substrate selection and the positive-versus-negative direction of its outputs across the many pathways it touches, and whether a unifying activation logic links its Wnt, Hippo, mTOR, immune, and cell-death roles.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of substrate recognition\", \"No comprehensive phosphoproteomic substrate map\", \"Context determinants of positive vs negative regulation undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 4, 13, 14, 16, 23, 17, 20, 10]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [1, 3, 13, 14]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 12, 22]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2, 12, 14, 13]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 3, 4, 16, 22, 23]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [17, 18, 30]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4, 12, 23, 28]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [30]},\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"complexes\": [\n      \"TAK1-TAB2-NLK complex\",\n      \"PANoptosome (FADD-RIPK1/3-Caspase-8)\"\n    ],\n    \"partners\": [\n      \"TAK1\",\n      \"TAB2\",\n      \"TCF/LEF (LEF1)\",\n      \"YAP\",\n      \"MAVS\",\n      \"WIP1\",\n      \"USP14\",\n      \"HIPK2\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}