{"gene":"STK11","run_date":"2026-06-10T07:46:43","timeline":{"discoveries":[{"year":2009,"finding":"LKB1 directly phosphorylates and activates AMPK, a central metabolic sensor, linking cell metabolism to growth control and cell polarity. LKB1 acts as an upstream kinase for AMPK and 14 related AMPK subfamily kinases.","method":"Biochemical kinase assays, genetic epistasis, and multiple experimental systems reviewed","journal":"Nature reviews. Cancer","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct phosphorylation established biochemically and replicated across many independent labs over a decade","pmids":["19629071"],"is_preprint":false},{"year":2004,"finding":"LKB1 forms a heterotrimeric complex with the pseudokinase STRAD and the armadillo-repeat scaffold protein MO25. Binding to STRAD-MO25 activates LKB1 kinase activity and re-localizes it from the nucleus to the cytoplasm. Two binding sites on MO25α are required for complex assembly, and LKB1 activation by STRADα-MO25α does not require phosphorylation of LKB1's own T-loop. STRADα binds ATP with high affinity but this is not required for LKB1 activation. Twelve of 34 cancer-derived LKB1 point mutants tested failed to interact with STRAD-MO25.","method":"Point mutagenesis of 34 LKB1 cancer mutants, co-immunoprecipitation, kinase activity assays, immunofluorescence localization","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (mutagenesis, Co-IP, kinase assays, imaging) in one rigorous study; findings confirmed by multiple subsequent labs","pmids":["15561763"],"is_preprint":false},{"year":2006,"finding":"LKB1 kinase activity and cellular localization are controlled through interaction with the catalytically inactive pseudokinase STRAD and the armadillo-repeat protein MO25. LKB1 phosphorylates and activates 14 kinases related to AMPK, mediating effects on metabolism, polarity, and proliferation.","method":"Biochemical reconstitution, interaction studies, substrate phosphorylation assays (reviewed from primary experimental literature)","journal":"Annual review of biochemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reviews extensively replicated primary experimental findings across multiple independent labs","pmids":["16756488"],"is_preprint":false},{"year":2007,"finding":"In Drosophila, LKB1 is required in vivo for AMPK activation; lkb1 mutations phenocopy ampkalpha mutations (loss of epithelial polarity and overproliferation under energetic stress). A phosphomimetic AMPKα rescues lkb1 mutant phenotypes, establishing genetic epistasis: LKB1 signals through AMPK to coordinate epithelial polarity and proliferation with cellular energy status.","method":"Drosophila genetics: lkb1 and AMPKα mutant analysis, epistasis with phosphomimetic AMPKα, immunofluorescence","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic epistasis in vivo with phosphomimetic rescue; replicated across Drosophila and mammalian contexts","pmids":["17470638"],"is_preprint":false},{"year":2012,"finding":"The orphan nuclear receptor Nur77 binds and sequesters LKB1 in the nucleus, attenuating AMPK activation. The compound TMPA binds Nur77 with high affinity, releasing LKB1 to shuttle to the cytoplasm where it phosphorylates AMPKα. Nur77 knockout mice do not respond to TMPA's glucose-lowering effects, confirming on-pathway requirement.","method":"Co-immunoprecipitation, pulldown, subcellular fractionation, kinase assays, Nur77 knockout mouse model, glucose/insulin assays","journal":"Nature chemical biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, subcellular localization, in vivo genetic validation with knockout, multiple orthogonal methods","pmids":["22983157"],"is_preprint":false},{"year":2009,"finding":"LKB1 regulates pancreatic beta cell size, polarity, and function through distinct downstream targets: cell size is controlled via mTOR pathway; nuclear position polarity is controlled via LKB1 target Par1b; insulin secretion is restricted via AMPK. LKB1-deficient beta cells show dramatic increase in insulin secretion, altered nuclear/cilia localization, and 65% increased cell volume.","method":"Beta cell-specific LKB1 conditional knockout mice; histology, immunofluorescence, insulin secretion assays, pathway-specific genetic dissection","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout with multiple orthogonal readouts and genetic dissection of pathway branches","pmids":["19808022"],"is_preprint":false},{"year":2014,"finding":"LKB1 promotes RAB7-mediated trafficking of the angiogenic receptor NRP-1 from late endosomes to the lysosome for degradation, suppressing angiogenesis. LKB1 specifically binds GTP-bound (active) RAB7 but not GDP-bound RAB7. siRNA depletion of RAB7 disrupts NRP-1 lysosomal transfer and increases tumor growth and angiogenesis.","method":"Co-immunoprecipitation, pulldown with GTP/GDP-RAB7 forms, siRNA knockdown, live-cell trafficking assays, tumor xenograft models","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, GTP/GDP-form specificity test, functional siRNA rescue, in vivo xenograft validation","pmids":["25180605"],"is_preprint":false},{"year":2019,"finding":"FBXO22 interacts with LKB1 and mediates Lys-63-linked polyubiquitination of LKB1, inhibiting LKB1 kinase activity and thereby promoting NSCLC cell growth through inhibition of LKB1-AMPK-mTOR signaling.","method":"Co-immunoprecipitation, ubiquitination assays (linkage-specific), kinase activity assays, overexpression/knockdown in cell lines and xenografts","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and linkage-specific ubiquitination assays with functional validation, single lab","pmids":["31217475"],"is_preprint":false},{"year":2021,"finding":"LKB1 directly binds Sirt1 in a resveratrol-stimulated manner and phosphorylates Sirt1 at three C-terminal serine residues, which increases intramolecular Sirt1 interactions (C-terminus binding to deacetylase core domain), eliminates DBC1 inhibition, and promotes Sirt1-substrate interaction. This LKB1-dependent Sirt1 activation increases mitochondrial biogenesis and respiration via PGC-1α deacetylation.","method":"Knockdown/rescue experiments, fluorometric Sirt1 activity assays, immunoprecipitation, pulldown assays, site-directed mutagenesis of phosphorylation sites","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay with mutagenesis, Co-IP, functional rescue, single lab","pmids":["34216621"],"is_preprint":false},{"year":2014,"finding":"LKB1 activity is required for microtubule-dependent trafficking of the bile acid transporter ABCB11 to the canalicular membrane and for hepatocyte polarization and canalicular network formation. In LKB1 knockout hepatocytes, ABCB11 trafficking is greatly reduced and only restored by cAMP (via PKA, not AMPK), not by taurocholate.","method":"Liver-specific LKB1 knockout mice, live-cell imaging, FRAP, particle tracking, biochemical fractionation","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with direct live-imaging (FRAP, particle tracking) demonstrating mechanistic consequence; multiple orthogonal methods","pmids":["24643070"],"is_preprint":false},{"year":2019,"finding":"CRISPR/Cas9-based combinatorial knockout in a KRAS-driven lung adenocarcinoma mouse model demonstrated that SIK family kinases are critical downstream effectors of LKB1-mediated tumor suppression. SIK- and LKB1-deficient tumors share histologic and gene-expression similarities, placing SIKs in the same tumor-suppressive axis as LKB1.","method":"CRISPR/Cas9 combinatorial genome editing in vivo, histology, gene-expression profiling, genetic epistasis","journal":"Cancer discovery","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo combinatorial CRISPR epistasis with transcriptomic validation, rigorous design","pmids":["31350327"],"is_preprint":false},{"year":2014,"finding":"LKB1 controls inflammatory gene expression through the CRTC2-SIK axis: LKB1 loss triggers elevated CRTC2-CREB signaling downstream of SIK kinases, increasing cytokine and chemokine production. Mechanistically, CRTC2 cooperates with histone acetyltransferases CBP/p300 to deposit H3K27ac marks at inflammatory gene loci.","method":"Genetic deletion of LKB1, ChIP for H3K27ac, transcriptomic analysis, CRTC2 overexpression/knockdown, cytokine measurements","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, genetic KO, and epistasis with CRTC2; single lab with multiple orthogonal methods","pmids":["37172591"],"is_preprint":false},{"year":2014,"finding":"LKB1 reduces intracellular ROS and protects genome from oxidative damage independently of AMPK. Under elevated ROS, LKB1 binds to and maintains the activity of the cdc42-PAK1 complex, triggering p38 activation and downstream ATF-2 signaling, which enhances superoxide dismutase-2 and catalase activity.","method":"LKB1 KO/re-expression, ROS measurements, DNA damage assays, Co-IP of LKB1-PAK1 complex, kinase activity assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, functional rescue, ROS and DNA damage assays, single lab","pmids":["25263448"],"is_preprint":false},{"year":2016,"finding":"LKB1 loss combined with KRAS activation induces mTOR-dependent upregulation of the serine-glycine-one-carbon pathway and S-adenosylmethionine generation. Simultaneously, DNA methyltransferases are upregulated, elevating DNA methylation at retrotransposon elements. LKB1-deficient cells and tumors are sensitized to inhibition of serine biosynthesis and DNA methylation.","method":"Genetically engineered mouse models, primary pancreatic epithelial cells, transcriptomics, proteomics, metabolic analyses, bisulfite sequencing for DNA methylation","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal omics approaches with in vivo models and mechanistic pharmacological validation","pmids":["27799657"],"is_preprint":false},{"year":2021,"finding":"LKB1 inactivation drives chromatin accessibility changes and acts as a master regulator of chromatin remodeling in lung adenocarcinoma primary tumors. Loss of LKB1 activates the endoderm transcription factor SOX17 in metastases, which drives a second wave of epigenetic changes enhancing metastatic ability; SOX17 expression is necessary and sufficient for this metastatic epigenetic reprogramming.","method":"CRISPR-Cas9 screening, single-cell multi-omic analysis (ATAC-seq, RNA-seq), in vivo metastasis models, SOX17 gain/loss-of-function","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — genome-scale CRISPR screening plus single-cell multi-omics with in vivo validation and functional gain/loss experiments","pmids":["34341533"],"is_preprint":false},{"year":2017,"finding":"Lkb1 maintains regulatory T (Treg) cell lineage identity by stabilizing Foxp3 expression. Lkb1 prevents STAT4-mediated methylation of the conserved noncoding sequence 2 (CNS2) in the Foxp3 locus. Independently, Lkb1 programs immunosuppressive gene expression through augmentation of TGF-β signaling. Treg-specific deletion of Lkb1 causes fatal early-onset autoimmune disease with loss of Foxp3 expression.","method":"T cell-specific conditional knockout, bisulfite sequencing of CNS2, STAT4 mechanistic studies, TGF-β signaling assays, flow cytometry","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with defined molecular mechanism (STAT4/CNS2 methylation), multiple orthogonal methods","pmids":["28621313"],"is_preprint":false},{"year":2022,"finding":"LKB1 couples mitochondrial function to cytokine expression in TH17 cells by regulating TCA cycle metabolism. Mitochondrial membrane disruption activates LKB1, which restrains IL-17 expression. LKB1 deletion restores IL-17 expression in TH17 cells with disrupted mitochondrial membranes by rectifying aberrant TCA cycle glutamine flux, balancing NADH/NAD+, and preventing 2-hydroxyglutarate production.","method":"T cell-specific LKB1 deletion, multi-omics (metabolomics, transcriptomics, epigenomics), OPA1 deletion, functional cytokine assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multi-omics with genetic deletion and mechanistic metabolic validation, rigorous study","pmids":["36171294"],"is_preprint":false},{"year":2022,"finding":"The Golgi-localized protein TBC1D23 directly interacts with LKB1 and recruits it to the Golgi, promoting Golgi-specific activation of AMPK upon energy stress. Golgi-targeted LKB1 expression rescues TBC1D23 deficiency in zebrafish. LKB1 loss causes neurodevelopmental abnormalities in zebrafish that partially recapitulate TBC1D23 deficiency phenotypes.","method":"Co-immunoprecipitation, subcellular fractionation, AMPK activity assays, Golgi-targeted LKB1 constructs, zebrafish genetic models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct protein interaction, compartment-specific functional rescue in vivo, multiple orthogonal methods","pmids":["38413626"],"is_preprint":false},{"year":2022,"finding":"SCO1 constitutively interacts with LKB1; copper-loaded SCO1 directly tethers LKB1 to AMPK, activating AMPK and promoting mitochondrial biogenesis and fatty acid oxidation. This copper-SCO1-LKB1-AMPK complex assembly represents a mechanism by which copper as a signaling molecule regulates lipid catabolism.","method":"Co-immunoprecipitation of SCO1-LKB1-AMPK complex, biochemical copper-loading assays, AMPK activity assays, mouse models with Cp ablation","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of ternary complex, biochemical copper-loading test, in vivo validation; single lab","pmids":["36261001"],"is_preprint":false},{"year":2022,"finding":"Intracellular midkine (MDK) disrupts the LKB1-STRAD-Mo25 complex by interacting with LKB1 and STRAD, decreasing LKB1 activity and dampening basal and stress-induced AMPK activation.","method":"Co-immunoprecipitation, AMPK activity assays, cell-based glucose starvation/2-DG stress assays, MDK overexpression","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of MDK with LKB1/STRAD, functional AMPK activity assays; single lab","pmids":["35487917"],"is_preprint":false},{"year":2023,"finding":"MKP1 promotes LKB1 nuclear retention through a MKP1-p38 MAPK-LKB1 signaling axis: under NASH conditions, oxidative stress induces MKP1 expression, leading to nuclear p38 MAPK dephosphorylation and decreased LKB1 phosphorylation at a site required for LKB1 nuclear export. Hepatic MKP1 deletion releases nuclear LKB1 to the cytoplasm, activating AMPKα and preventing NASH.","method":"Hepatic MKP1 conditional knockout mice, subcellular fractionation, phospho-specific antibodies, AMPK activity assays, NASH diet feeding","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with defined phosphorylation mechanism, subcellular localization, and in vivo disease model","pmids":["37669951"],"is_preprint":false},{"year":2014,"finding":"LKB1 post-transcriptionally stimulates BRCA1 expression by inhibiting the cytoplasmic localization of the RNA-binding protein HuR in an AMPK-dependent manner, thereby stabilizing BRCA1 mRNA. This maintains homology-directed DNA repair (HDR) capacity. Cells lacking LKB1 display defective HDR and increased DNA double-strand breaks.","method":"LKB1 knockdown/overexpression, HuR localization assays, BRCA1 mRNA stability assays, DNA damage (γ-H2AX) assays, HDR reporter assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional assays with mechanistic follow-up for HuR localization and mRNA stability; single lab","pmids":["25488815"],"is_preprint":false},{"year":2014,"finding":"LKB1 regulates synaptic remodeling in the aging retina: LKB1 and its substrate AMPK function in rod photoreceptors to maintain synaptic stability. Loss of either kinase in young adult mice produces retinal synaptic defects (aberrant axonal retraction, ectopic dendritic extension, ectopic synapses) resembling those in old wild-type animals. Genetic or pharmacological AMPK activation attenuates age-related synaptic alterations.","method":"Conditional KO of LKB1 and AMPK in rod photoreceptors, retinal immunofluorescence and EM morphology, ERG functional assays, pharmacological AMPK activation","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with defined cellular phenotype, pharmacological epistasis, multiple orthogonal readouts","pmids":["25086610"],"is_preprint":false},{"year":2014,"finding":"LKB1 activity in Schwann cells is central to axon stability. LKB1 deletion in Schwann cells causes abnormalities in nerve energy and lipid homeostasis and increased lactate release that compensatorily supports distressed axons. AMPK and mTOR in Schwann cells are largely dispensable for this support function.","method":"SC-specific LKB1 conditional knockout mice, molecular, structural and behavioral characterization, metabolic profiling","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with multiple orthogonal characterization methods and defined metabolic mechanism; pathway dissection via AMPK/mTOR genetic controls","pmids":["25195104"],"is_preprint":false},{"year":2018,"finding":"In Purkinje cells, the LKB1-SIK1/SIK2 kinase pathway ensures dendritic localization of Robo2, a regulator of dendrite self-avoidance. PC-specific LKB1 deletion severely disrupts dendrite self-avoidance without affecting gross morphology. Restoration of dendritic Robo2 by overexpression largely rescues the self-avoidance defect in LKB1-deficient PCs.","method":"Conditional LKB1 KO in Purkinje cells, immunofluorescence for Robo2 localization, Robo2 rescue experiment, SIK1/SIK2 downstream validation","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with rescue experiment, downstream kinase epistasis, defined localization mechanism","pmids":["30208308"],"is_preprint":false},{"year":2014,"finding":"STRADα specifically maintains LKB1 protein levels via cytoplasmic compartmentalization (reciprocal protein-stabilizing relationship in vivo). STRADβ is also sufficient for axogenesis in cortical neurons but does not stabilize LKB1 protein levels.","method":"In vivo STRAD conditional expression studies in developing cortex, immunofluorescence, Western blotting for LKB1 levels","journal":"Neural development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo protein stability assay with compartmentalization readout; single lab","pmids":["24594058"],"is_preprint":false},{"year":2019,"finding":"LKB1 deficiency in periosteal mesenchymal progenitors (Ctsk+ cells) increases proliferation and osteoblast differentiation leading to osteogenic tumor formation. This effect is mediated via mTORC1, as raptor genetic deletion or mTORC1 inhibitor treatment ameliorates tumor progression in Ctsk-Cre Lkb1fl/fl mice.","method":"Conditional LKB1 KO in Ctsk-Cre cells, lineage tracing, mTORC1 genetic and pharmacological inhibition, xenograft models","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with genetic and pharmacological mTORC1 epistasis, in vivo validation","pmids":["30830877"],"is_preprint":false},{"year":2018,"finding":"LKB1 directly interacts with and phosphorylates PRMT5 at T132, T139, and T144 residues within the TIM-Barrel domain. Point mutation of T139/144 to A drastically decreases PRMT5 methyltransferase activity, likely due to loss of interaction with regulatory proteins MEP50, pICln, and RiOK1.","method":"Co-immunoprecipitation, in vitro kinase assay, site-directed mutagenesis of PRMT5 phosphorylation sites, methyltransferase activity assay","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay with mutagenesis and functional readout; single lab","pmids":["30289978"],"is_preprint":false},{"year":2007,"finding":"LKB1 catalytically deficient mutants (when introduced into DLD1 colorectal cancer cells) activate cyclin D1 expression through recruitment to response elements in the cyclin D1 promoter, and allow cell cycle progression to S phase. Wild-type LKB1 causes G1 arrest independent of p21 or p53.","method":"Introduction of LKB1 WT and catalytic mutants into p21-/-p53-/- colorectal cancer cells, cell cycle analysis, promoter-binding assays, Western blotting","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined cellular assay with promoter binding and cell cycle readout, catalytic mutant comparison; single lab","pmids":["17575127"],"is_preprint":false},{"year":2022,"finding":"LKB1 stabilizes and activates p53 through the JNK pathway in response to cisplatin-induced DNA damage, promoting apoptosis. Conversely, AMPK (downstream of LKB1) negatively regulates cisplatin-induced apoptosis by suppressing ROS-mediated p53 activation, revealing reciprocal regulation of p53 by LKB1 and AMPK in DNA damage response.","method":"LKB1 and AMPKα1/α2 double knockout cells, cisplatin treatment, apoptosis assays, p53 stabilization assays, JNK pathway inhibition, antioxidant rescue","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with pathway inhibition and antioxidant rescue; single lab, multiple readouts","pmids":["36077459"],"is_preprint":false},{"year":2014,"finding":"LKB1 limits satellite cell proliferation through the AMPK/mTOR pathway but facilitates differentiation through phosphorylation of GSK-3β (a WNT signaling component). Lkb1 null satellite cells fail to maintain quiescence and show accelerated proliferation but reduced differentiation.","method":"MyoD-Cre and Pax7-CreER conditional LKB1 knockout mice, satellite cell isolation, proliferation/differentiation assays, pathway inhibitor treatments","journal":"Stem cells (Dayton, Ohio)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with pathway-specific readouts; GSK-3β phosphorylation mechanistic evidence moderate-strength","pmids":["25069613"],"is_preprint":false}],"current_model":"STK11/LKB1 is a serine-threonine master kinase that, when activated within a heterotrimeric complex with the pseudokinase STRAD and scaffold protein MO25 (which relocalize it from nucleus to cytoplasm), directly phosphorylates and activates AMPK and at least 13 other AMPK-related kinases (SIKs, MARKs, BRSKs, SADs) to regulate energy homeostasis, cell polarity, proliferation, metabolism, and chromatin state; its activity is controlled by nuclear sequestration via Nur77 or MKP1-p38-mediated retention, by Lys-63-linked ubiquitination via FBXO22, by Golgi-specific recruitment via TBC1D23, and by disruption of the STRAD-MO25 complex through midkine; downstream, LKB1 phosphorylates PRMT5, Sirt1, GSK-3β, and p53/JNK pathway components, suppresses mTORC1, controls chromatin accessibility through SIK-CRTC2-CBP/p300-H3K27ac signaling, promotes RAB7-mediated receptor degradation, and maintains cell-type-specific identity in T cells, beta cells, Schwann cells, and neurons."},"narrative":{"mechanistic_narrative":"STK11/LKB1 is a serine-threonine master kinase that couples cellular energy status to growth control, cell polarity, metabolism, and chromatin state by directly phosphorylating and activating AMPK and a family of 14 AMPK-related kinases [PMID:19629071, PMID:16756488]. Its catalytic activity and subcellular distribution are set by assembly into a heterotrimeric complex with the pseudokinase STRAD and the armadillo-repeat scaffold MO25, which activates LKB1 independently of T-loop phosphorylation and relocalizes it from nucleus to cytoplasm; many cancer-derived point mutants fail to engage this complex [PMID:15561763]. Genetic epistasis in vivo confirms that LKB1 signals through AMPK to coordinate epithelial polarity and proliferation with energy supply [PMID:17470638], and through downstream branches it restricts mTORC1 to limit proliferation and tumorigenesis [PMID:30830877] and activates SIK kinases that constitute a core tumor-suppressive axis [PMID:31350327]. LKB1 governs chromatin and transcriptional programs: loss reprograms chromatin accessibility and, via SOX17, drives metastatic epigenetic states [PMID:34341533], upregulates serine-one-carbon metabolism and DNA methylation when combined with KRAS [PMID:27799657], and de-represses CRTC2-CREB inflammatory gene expression through H3K27ac deposition [PMID:37172591]. Beyond canonical signaling, LKB1 maintains cell-type identity and homeostasis in Treg cells via Foxp3 stabilization [PMID:28621313], TH17 cells via mitochondrial-TCA coupling [PMID:36171294], beta cells [PMID:19808022], Schwann cells [PMID:25195104], and neurons [PMID:25086610, PMID:30208308], and supports vesicular trafficking through GTP-RAB7-dependent receptor degradation [PMID:25180605]. LKB1 activity is further tuned by nuclear sequestration through Nur77 [PMID:22983157] and an MKP1-p38 axis [PMID:37669951], by FBXO22-mediated Lys-63 ubiquitination [PMID:31217475], by Golgi recruitment via TBC1D23 [PMID:38413626], and by disruption of the STRAD-MO25 complex by midkine [PMID:35487917]. Additional substrates and partners include PRMT5 [PMID:30289978], Sirt1 [PMID:34216621], GSK-3β [PMID:25069613], and the p53/JNK DNA-damage axis [PMID:36077459].","teleology":[{"year":2004,"claim":"Established how LKB1 is switched on and positioned in the cell, answering why an apparently constitutive kinase requires partners for activity and localization.","evidence":"Point mutagenesis of 34 cancer mutants, Co-IP, kinase assays, and imaging of the LKB1-STRAD-MO25 complex","pmids":["15561763"],"confidence":"High","gaps":["Structural basis of activation refined only later","Does not address tissue-specific regulators of complex assembly"]},{"year":2006,"claim":"Consolidated LKB1 as the upstream kinase for AMPK and 14 related kinases, defining the breadth of its substrate family across metabolism, polarity, and proliferation.","evidence":"Review of biochemical reconstitution and substrate phosphorylation assays","pmids":["16756488"],"confidence":"High","gaps":["Which AMPK-related kinases dominate in which tissue not resolved"]},{"year":2007,"claim":"Demonstrated in vivo that LKB1 acts through AMPK to coordinate epithelial polarity and proliferation with energy status, moving beyond in vitro phosphorylation to physiological output.","evidence":"Drosophila lkb1/AMPKalpha genetics with phosphomimetic rescue epistasis","pmids":["17470638"],"confidence":"High","gaps":["AMPK-independent LKB1 functions not addressed here"]},{"year":2007,"claim":"Revealed a kinase-independent LKB1 activity controlling cyclin D1 transcription and G1 arrest, indicating LKB1 outputs are not solely catalytic.","evidence":"WT vs catalytic-mutant LKB1 introduced into p21-/-p53-/- colorectal cells with promoter-binding and cell-cycle assays","pmids":["17575127"],"confidence":"Medium","gaps":["Single lab","Mechanism of LKB1 recruitment to the cyclin D1 promoter not defined","Generality across cell types unknown"]},{"year":2009,"claim":"Dissected LKB1 outputs in a physiological tissue into separable mTOR, Par1b, and AMPK branches governing beta cell size, polarity, and insulin secretion.","evidence":"Beta cell-specific conditional knockout with pathway-specific genetic dissection","pmids":["19808022"],"confidence":"High","gaps":["How LKB1 partitions among branches in a single cell not resolved"]},{"year":2012,"claim":"Identified nuclear sequestration by Nur77 as a regulated switch controlling cytoplasmic LKB1 availability and AMPK activation in metabolic control.","evidence":"Co-IP, fractionation, kinase assays, and Nur77 knockout mice with glucose assays plus TMPA ligand","pmids":["22983157"],"confidence":"High","gaps":["Signals that release LKB1 physiologically beyond TMPA not defined"]},{"year":2014,"claim":"Defined a kinase-dependent LKB1 role in vesicular trafficking by showing direct binding to active RAB7 to route the angiogenic receptor NRP-1 to lysosomal degradation.","evidence":"GTP/GDP-RAB7 form-specific pulldowns, siRNA rescue, and tumor xenografts","pmids":["25180605"],"confidence":"High","gaps":["Whether LKB1 phosphorylates a trafficking substrate not established"]},{"year":2014,"claim":"Showed LKB1 controls polarized transporter trafficking and hepatocyte canalicular architecture through a PKA-dependent, AMPK-independent route.","evidence":"Liver-specific knockout with FRAP, particle tracking, and cAMP/PKA rescue","pmids":["24643070"],"confidence":"High","gaps":["Direct LKB1 substrate for ABCB11 trafficking unidentified"]},{"year":2014,"claim":"Linked LKB1 to genome protection via an AMPK-independent ROS-limiting cdc42-PAK1-p38-ATF2 axis enhancing antioxidant enzymes.","evidence":"LKB1 KO/re-expression with ROS, DNA damage assays, and LKB1-PAK1 Co-IP","pmids":["25263448"],"confidence":"Medium","gaps":["Single lab","Whether LKB1 phosphorylates PAK1 directly not shown"]},{"year":2014,"claim":"Connected LKB1 to homology-directed DNA repair through AMPK-dependent control of HuR localization stabilizing BRCA1 mRNA.","evidence":"LKB1 knockdown/overexpression with HuR localization, mRNA stability, and HDR reporter assays","pmids":["25488815"],"confidence":"Medium","gaps":["Single lab","Direct phosphorylation event in the HuR axis not mapped"]},{"year":2014,"claim":"Established that LKB1 maintains neuronal synaptic stability and Schwann cell axon support, extending its role to nervous-system homeostasis with differing AMPK dependence.","evidence":"Cell-type-specific conditional knockouts in rod photoreceptors and Schwann cells with morphology, ERG, and metabolic profiling","pmids":["25086610","25195104"],"confidence":"High","gaps":["Downstream effectors in Schwann cells beyond metabolic rewiring not fully defined"]},{"year":2014,"claim":"Showed LKB1 controls satellite cell quiescence via AMPK/mTOR and differentiation via GSK-3beta phosphorylation, separating proliferation from differentiation outputs.","evidence":"Conditional knockouts with proliferation/differentiation assays and pathway inhibitors","pmids":["25069613"],"confidence":"Medium","gaps":["Single lab","Directness of GSK-3beta phosphorylation moderately supported"]},{"year":2014,"claim":"Defined an LKB1-SIK-CRTC2 axis controlling inflammatory transcription through CBP/p300-mediated H3K27ac, linking the kinase to chromatin-level gene regulation.","evidence":"LKB1 deletion with H3K27ac ChIP, transcriptomics, and CRTC2 manipulation","pmids":["37172591"],"confidence":"Medium","gaps":["Single lab","Direct SIK targets within the inflammatory program not enumerated"]},{"year":2014,"claim":"Showed STRADalpha stabilizes LKB1 protein via cytoplasmic compartmentalization, separating STRAD's stabilizing and axogenic functions.","evidence":"In vivo STRAD conditional expression in developing cortex with LKB1 protein-level readouts","pmids":["24594058"],"confidence":"Medium","gaps":["Single lab","Mechanism of compartment-dependent stabilization unresolved"]},{"year":2016,"claim":"Revealed that LKB1 loss with KRAS rewires serine-one-carbon metabolism and DNA methylation, connecting the kinase to metabolic-epigenetic vulnerability.","evidence":"Genetically engineered mouse models with transcriptomics, metabolomics, and bisulfite sequencing plus pharmacological validation","pmids":["27799657"],"confidence":"High","gaps":["mTOR-dependence dissected, but direct LKB1 substrate driving methylation not identified"]},{"year":2017,"claim":"Established LKB1 as a guardian of Treg lineage identity by preventing STAT4-driven CNS2 methylation to stabilize Foxp3 and augmenting TGF-beta signaling.","evidence":"T cell-specific conditional knockout with bisulfite sequencing and signaling assays","pmids":["28621313"],"confidence":"High","gaps":["Whether LKB1 acts via AMPK-family kinases in this context not specified"]},{"year":2018,"claim":"Identified PRMT5 as a direct LKB1 substrate, with phosphorylation in the TIM-barrel domain required for methyltransferase activity, expanding LKB1 substrates beyond the AMPK family.","evidence":"Co-IP, in vitro kinase assay, site mutagenesis, and methyltransferase activity assays","pmids":["30289978"],"confidence":"Medium","gaps":["Single lab","Cellular consequences of PRMT5 phosphorylation not fully mapped"]},{"year":2018,"claim":"Showed an LKB1-SIK1/SIK2 pathway ensures dendritic Robo2 localization to enforce Purkinje cell dendrite self-avoidance, a discrete neuronal patterning role.","evidence":"Conditional knockout with Robo2 localization imaging and rescue plus SIK downstream validation","pmids":["30208308"],"confidence":"High","gaps":["How SIKs control Robo2 trafficking molecularly not resolved"]},{"year":2019,"claim":"Placed SIK family kinases as critical effectors of LKB1 tumor suppression in KRAS-driven lung adenocarcinoma via combinatorial in vivo genetics.","evidence":"CRISPR/Cas9 combinatorial knockout with histology and gene-expression epistasis","pmids":["31350327"],"confidence":"High","gaps":["Relative contribution of individual SIKs not separated"]},{"year":2019,"claim":"Identified FBXO22-mediated Lys-63 polyubiquitination as a post-translational brake on LKB1 kinase activity promoting NSCLC growth.","evidence":"Co-IP, linkage-specific ubiquitination assays, and kinase/functional validation in cells and xenografts","pmids":["31217475"],"confidence":"Medium","gaps":["Single lab","Ubiquitination site(s) on LKB1 not mapped"]},{"year":2019,"claim":"Demonstrated LKB1 restrains periosteal progenitor proliferation and osteogenic tumor formation through mTORC1, generalizing its mTOR-suppressive tumor-suppressor role to skeletal tissue.","evidence":"Ctsk-Cre conditional knockout with raptor deletion and mTORC1 inhibitor epistasis","pmids":["30830877"],"confidence":"High","gaps":["Whether AMPK contributes upstream of mTORC1 here not dissected"]},{"year":2021,"claim":"Established LKB1 as a master regulator of chromatin accessibility whose loss activates SOX17 to drive metastatic epigenetic reprogramming.","evidence":"CRISPR 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quantified"]},{"year":2022,"claim":"Showed copper-loaded SCO1 tethers LKB1 to AMPK, revealing copper as a signaling input to LKB1-AMPK control of lipid catabolism.","evidence":"Co-IP of the ternary complex, copper-loading assays, AMPK activity, and Cp-ablated mice","pmids":["36261001"],"confidence":"Medium","gaps":["Single lab","Stoichiometry and physiological copper range not defined"]},{"year":2022,"claim":"Identified intracellular midkine as a disruptor of the LKB1-STRAD-MO25 complex that dampens AMPK activation, adding a complex-disassembly regulatory mode.","evidence":"Co-IP with LKB1/STRAD and AMPK activity under glucose/2-DG stress","pmids":["35487917"],"confidence":"Medium","gaps":["Single lab","Binding interface on the complex not mapped"]},{"year":2022,"claim":"Showed LKB1 couples mitochondrial membrane integrity to TH17 cytokine output by rectifying TCA glutamine flux and NADH/NAD+ balance.","evidence":"T cell-specific deletion with multi-omics, OPA1 deletion, and cytokine 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LKB1 acts as an upstream kinase for AMPK and 14 related AMPK subfamily kinases.\",\n      \"method\": \"Biochemical kinase assays, genetic epistasis, and multiple experimental systems reviewed\",\n      \"journal\": \"Nature reviews. Cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct phosphorylation established biochemically and replicated across many independent labs over a decade\",\n      \"pmids\": [\"19629071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"LKB1 forms a heterotrimeric complex with the pseudokinase STRAD and the armadillo-repeat scaffold protein MO25. Binding to STRAD-MO25 activates LKB1 kinase activity and re-localizes it from the nucleus to the cytoplasm. Two binding sites on MO25α are required for complex assembly, and LKB1 activation by STRADα-MO25α does not require phosphorylation of LKB1's own T-loop. STRADα binds ATP with high affinity but this is not required for LKB1 activation. Twelve of 34 cancer-derived LKB1 point mutants tested failed to interact with STRAD-MO25.\",\n      \"method\": \"Point mutagenesis of 34 LKB1 cancer mutants, co-immunoprecipitation, kinase activity assays, immunofluorescence localization\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (mutagenesis, Co-IP, kinase assays, imaging) in one rigorous study; findings confirmed by multiple subsequent labs\",\n      \"pmids\": [\"15561763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"LKB1 kinase activity and cellular localization are controlled through interaction with the catalytically inactive pseudokinase STRAD and the armadillo-repeat protein MO25. LKB1 phosphorylates and activates 14 kinases related to AMPK, mediating effects on metabolism, polarity, and proliferation.\",\n      \"method\": \"Biochemical reconstitution, interaction studies, substrate phosphorylation assays (reviewed from primary experimental literature)\",\n      \"journal\": \"Annual review of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reviews extensively replicated primary experimental findings across multiple independent labs\",\n      \"pmids\": [\"16756488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In Drosophila, LKB1 is required in vivo for AMPK activation; lkb1 mutations phenocopy ampkalpha mutations (loss of epithelial polarity and overproliferation under energetic stress). A phosphomimetic AMPKα rescues lkb1 mutant phenotypes, establishing genetic epistasis: LKB1 signals through AMPK to coordinate epithelial polarity and proliferation with cellular energy status.\",\n      \"method\": \"Drosophila genetics: lkb1 and AMPKα mutant analysis, epistasis with phosphomimetic AMPKα, immunofluorescence\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic epistasis in vivo with phosphomimetic rescue; replicated across Drosophila and mammalian contexts\",\n      \"pmids\": [\"17470638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The orphan nuclear receptor Nur77 binds and sequesters LKB1 in the nucleus, attenuating AMPK activation. The compound TMPA binds Nur77 with high affinity, releasing LKB1 to shuttle to the cytoplasm where it phosphorylates AMPKα. Nur77 knockout mice do not respond to TMPA's glucose-lowering effects, confirming on-pathway requirement.\",\n      \"method\": \"Co-immunoprecipitation, pulldown, subcellular fractionation, kinase assays, Nur77 knockout mouse model, glucose/insulin assays\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, subcellular localization, in vivo genetic validation with knockout, multiple orthogonal methods\",\n      \"pmids\": [\"22983157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"LKB1 regulates pancreatic beta cell size, polarity, and function through distinct downstream targets: cell size is controlled via mTOR pathway; nuclear position polarity is controlled via LKB1 target Par1b; insulin secretion is restricted via AMPK. LKB1-deficient beta cells show dramatic increase in insulin secretion, altered nuclear/cilia localization, and 65% increased cell volume.\",\n      \"method\": \"Beta cell-specific LKB1 conditional knockout mice; histology, immunofluorescence, insulin secretion assays, pathway-specific genetic dissection\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout with multiple orthogonal readouts and genetic dissection of pathway branches\",\n      \"pmids\": [\"19808022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LKB1 promotes RAB7-mediated trafficking of the angiogenic receptor NRP-1 from late endosomes to the lysosome for degradation, suppressing angiogenesis. LKB1 specifically binds GTP-bound (active) RAB7 but not GDP-bound RAB7. siRNA depletion of RAB7 disrupts NRP-1 lysosomal transfer and increases tumor growth and angiogenesis.\",\n      \"method\": \"Co-immunoprecipitation, pulldown with GTP/GDP-RAB7 forms, siRNA knockdown, live-cell trafficking assays, tumor xenograft models\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, GTP/GDP-form specificity test, functional siRNA rescue, in vivo xenograft validation\",\n      \"pmids\": [\"25180605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"FBXO22 interacts with LKB1 and mediates Lys-63-linked polyubiquitination of LKB1, inhibiting LKB1 kinase activity and thereby promoting NSCLC cell growth through inhibition of LKB1-AMPK-mTOR signaling.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays (linkage-specific), kinase activity assays, overexpression/knockdown in cell lines and xenografts\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and linkage-specific ubiquitination assays with functional validation, single lab\",\n      \"pmids\": [\"31217475\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LKB1 directly binds Sirt1 in a resveratrol-stimulated manner and phosphorylates Sirt1 at three C-terminal serine residues, which increases intramolecular Sirt1 interactions (C-terminus binding to deacetylase core domain), eliminates DBC1 inhibition, and promotes Sirt1-substrate interaction. This LKB1-dependent Sirt1 activation increases mitochondrial biogenesis and respiration via PGC-1α deacetylation.\",\n      \"method\": \"Knockdown/rescue experiments, fluorometric Sirt1 activity assays, immunoprecipitation, pulldown assays, site-directed mutagenesis of phosphorylation sites\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay with mutagenesis, Co-IP, functional rescue, single lab\",\n      \"pmids\": [\"34216621\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LKB1 activity is required for microtubule-dependent trafficking of the bile acid transporter ABCB11 to the canalicular membrane and for hepatocyte polarization and canalicular network formation. In LKB1 knockout hepatocytes, ABCB11 trafficking is greatly reduced and only restored by cAMP (via PKA, not AMPK), not by taurocholate.\",\n      \"method\": \"Liver-specific LKB1 knockout mice, live-cell imaging, FRAP, particle tracking, biochemical fractionation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with direct live-imaging (FRAP, particle tracking) demonstrating mechanistic consequence; multiple orthogonal methods\",\n      \"pmids\": [\"24643070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CRISPR/Cas9-based combinatorial knockout in a KRAS-driven lung adenocarcinoma mouse model demonstrated that SIK family kinases are critical downstream effectors of LKB1-mediated tumor suppression. SIK- and LKB1-deficient tumors share histologic and gene-expression similarities, placing SIKs in the same tumor-suppressive axis as LKB1.\",\n      \"method\": \"CRISPR/Cas9 combinatorial genome editing in vivo, histology, gene-expression profiling, genetic epistasis\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo combinatorial CRISPR epistasis with transcriptomic validation, rigorous design\",\n      \"pmids\": [\"31350327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LKB1 controls inflammatory gene expression through the CRTC2-SIK axis: LKB1 loss triggers elevated CRTC2-CREB signaling downstream of SIK kinases, increasing cytokine and chemokine production. Mechanistically, CRTC2 cooperates with histone acetyltransferases CBP/p300 to deposit H3K27ac marks at inflammatory gene loci.\",\n      \"method\": \"Genetic deletion of LKB1, ChIP for H3K27ac, transcriptomic analysis, CRTC2 overexpression/knockdown, cytokine measurements\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, genetic KO, and epistasis with CRTC2; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"37172591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LKB1 reduces intracellular ROS and protects genome from oxidative damage independently of AMPK. Under elevated ROS, LKB1 binds to and maintains the activity of the cdc42-PAK1 complex, triggering p38 activation and downstream ATF-2 signaling, which enhances superoxide dismutase-2 and catalase activity.\",\n      \"method\": \"LKB1 KO/re-expression, ROS measurements, DNA damage assays, Co-IP of LKB1-PAK1 complex, kinase activity assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, functional rescue, ROS and DNA damage assays, single lab\",\n      \"pmids\": [\"25263448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"LKB1 loss combined with KRAS activation induces mTOR-dependent upregulation of the serine-glycine-one-carbon pathway and S-adenosylmethionine generation. Simultaneously, DNA methyltransferases are upregulated, elevating DNA methylation at retrotransposon elements. LKB1-deficient cells and tumors are sensitized to inhibition of serine biosynthesis and DNA methylation.\",\n      \"method\": \"Genetically engineered mouse models, primary pancreatic epithelial cells, transcriptomics, proteomics, metabolic analyses, bisulfite sequencing for DNA methylation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal omics approaches with in vivo models and mechanistic pharmacological validation\",\n      \"pmids\": [\"27799657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LKB1 inactivation drives chromatin accessibility changes and acts as a master regulator of chromatin remodeling in lung adenocarcinoma primary tumors. Loss of LKB1 activates the endoderm transcription factor SOX17 in metastases, which drives a second wave of epigenetic changes enhancing metastatic ability; SOX17 expression is necessary and sufficient for this metastatic epigenetic reprogramming.\",\n      \"method\": \"CRISPR-Cas9 screening, single-cell multi-omic analysis (ATAC-seq, RNA-seq), in vivo metastasis models, SOX17 gain/loss-of-function\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — genome-scale CRISPR screening plus single-cell multi-omics with in vivo validation and functional gain/loss experiments\",\n      \"pmids\": [\"34341533\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Lkb1 maintains regulatory T (Treg) cell lineage identity by stabilizing Foxp3 expression. Lkb1 prevents STAT4-mediated methylation of the conserved noncoding sequence 2 (CNS2) in the Foxp3 locus. Independently, Lkb1 programs immunosuppressive gene expression through augmentation of TGF-β signaling. Treg-specific deletion of Lkb1 causes fatal early-onset autoimmune disease with loss of Foxp3 expression.\",\n      \"method\": \"T cell-specific conditional knockout, bisulfite sequencing of CNS2, STAT4 mechanistic studies, TGF-β signaling assays, flow cytometry\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with defined molecular mechanism (STAT4/CNS2 methylation), multiple orthogonal methods\",\n      \"pmids\": [\"28621313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LKB1 couples mitochondrial function to cytokine expression in TH17 cells by regulating TCA cycle metabolism. Mitochondrial membrane disruption activates LKB1, which restrains IL-17 expression. LKB1 deletion restores IL-17 expression in TH17 cells with disrupted mitochondrial membranes by rectifying aberrant TCA cycle glutamine flux, balancing NADH/NAD+, and preventing 2-hydroxyglutarate production.\",\n      \"method\": \"T cell-specific LKB1 deletion, multi-omics (metabolomics, transcriptomics, epigenomics), OPA1 deletion, functional cytokine assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multi-omics with genetic deletion and mechanistic metabolic validation, rigorous study\",\n      \"pmids\": [\"36171294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The Golgi-localized protein TBC1D23 directly interacts with LKB1 and recruits it to the Golgi, promoting Golgi-specific activation of AMPK upon energy stress. Golgi-targeted LKB1 expression rescues TBC1D23 deficiency in zebrafish. LKB1 loss causes neurodevelopmental abnormalities in zebrafish that partially recapitulate TBC1D23 deficiency phenotypes.\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation, AMPK activity assays, Golgi-targeted LKB1 constructs, zebrafish genetic models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct protein interaction, compartment-specific functional rescue in vivo, multiple orthogonal methods\",\n      \"pmids\": [\"38413626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SCO1 constitutively interacts with LKB1; copper-loaded SCO1 directly tethers LKB1 to AMPK, activating AMPK and promoting mitochondrial biogenesis and fatty acid oxidation. This copper-SCO1-LKB1-AMPK complex assembly represents a mechanism by which copper as a signaling molecule regulates lipid catabolism.\",\n      \"method\": \"Co-immunoprecipitation of SCO1-LKB1-AMPK complex, biochemical copper-loading assays, AMPK activity assays, mouse models with Cp ablation\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of ternary complex, biochemical copper-loading test, in vivo validation; single lab\",\n      \"pmids\": [\"36261001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Intracellular midkine (MDK) disrupts the LKB1-STRAD-Mo25 complex by interacting with LKB1 and STRAD, decreasing LKB1 activity and dampening basal and stress-induced AMPK activation.\",\n      \"method\": \"Co-immunoprecipitation, AMPK activity assays, cell-based glucose starvation/2-DG stress assays, MDK overexpression\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of MDK with LKB1/STRAD, functional AMPK activity assays; single lab\",\n      \"pmids\": [\"35487917\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MKP1 promotes LKB1 nuclear retention through a MKP1-p38 MAPK-LKB1 signaling axis: under NASH conditions, oxidative stress induces MKP1 expression, leading to nuclear p38 MAPK dephosphorylation and decreased LKB1 phosphorylation at a site required for LKB1 nuclear export. Hepatic MKP1 deletion releases nuclear LKB1 to the cytoplasm, activating AMPKα and preventing NASH.\",\n      \"method\": \"Hepatic MKP1 conditional knockout mice, subcellular fractionation, phospho-specific antibodies, AMPK activity assays, NASH diet feeding\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with defined phosphorylation mechanism, subcellular localization, and in vivo disease model\",\n      \"pmids\": [\"37669951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LKB1 post-transcriptionally stimulates BRCA1 expression by inhibiting the cytoplasmic localization of the RNA-binding protein HuR in an AMPK-dependent manner, thereby stabilizing BRCA1 mRNA. This maintains homology-directed DNA repair (HDR) capacity. Cells lacking LKB1 display defective HDR and increased DNA double-strand breaks.\",\n      \"method\": \"LKB1 knockdown/overexpression, HuR localization assays, BRCA1 mRNA stability assays, DNA damage (γ-H2AX) assays, HDR reporter assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional assays with mechanistic follow-up for HuR localization and mRNA stability; single lab\",\n      \"pmids\": [\"25488815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LKB1 regulates synaptic remodeling in the aging retina: LKB1 and its substrate AMPK function in rod photoreceptors to maintain synaptic stability. Loss of either kinase in young adult mice produces retinal synaptic defects (aberrant axonal retraction, ectopic dendritic extension, ectopic synapses) resembling those in old wild-type animals. Genetic or pharmacological AMPK activation attenuates age-related synaptic alterations.\",\n      \"method\": \"Conditional KO of LKB1 and AMPK in rod photoreceptors, retinal immunofluorescence and EM morphology, ERG functional assays, pharmacological AMPK activation\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with defined cellular phenotype, pharmacological epistasis, multiple orthogonal readouts\",\n      \"pmids\": [\"25086610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LKB1 activity in Schwann cells is central to axon stability. LKB1 deletion in Schwann cells causes abnormalities in nerve energy and lipid homeostasis and increased lactate release that compensatorily supports distressed axons. AMPK and mTOR in Schwann cells are largely dispensable for this support function.\",\n      \"method\": \"SC-specific LKB1 conditional knockout mice, molecular, structural and behavioral characterization, metabolic profiling\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with multiple orthogonal characterization methods and defined metabolic mechanism; pathway dissection via AMPK/mTOR genetic controls\",\n      \"pmids\": [\"25195104\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In Purkinje cells, the LKB1-SIK1/SIK2 kinase pathway ensures dendritic localization of Robo2, a regulator of dendrite self-avoidance. PC-specific LKB1 deletion severely disrupts dendrite self-avoidance without affecting gross morphology. Restoration of dendritic Robo2 by overexpression largely rescues the self-avoidance defect in LKB1-deficient PCs.\",\n      \"method\": \"Conditional LKB1 KO in Purkinje cells, immunofluorescence for Robo2 localization, Robo2 rescue experiment, SIK1/SIK2 downstream validation\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with rescue experiment, downstream kinase epistasis, defined localization mechanism\",\n      \"pmids\": [\"30208308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"STRADα specifically maintains LKB1 protein levels via cytoplasmic compartmentalization (reciprocal protein-stabilizing relationship in vivo). STRADβ is also sufficient for axogenesis in cortical neurons but does not stabilize LKB1 protein levels.\",\n      \"method\": \"In vivo STRAD conditional expression studies in developing cortex, immunofluorescence, Western blotting for LKB1 levels\",\n      \"journal\": \"Neural development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo protein stability assay with compartmentalization readout; single lab\",\n      \"pmids\": [\"24594058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LKB1 deficiency in periosteal mesenchymal progenitors (Ctsk+ cells) increases proliferation and osteoblast differentiation leading to osteogenic tumor formation. This effect is mediated via mTORC1, as raptor genetic deletion or mTORC1 inhibitor treatment ameliorates tumor progression in Ctsk-Cre Lkb1fl/fl mice.\",\n      \"method\": \"Conditional LKB1 KO in Ctsk-Cre cells, lineage tracing, mTORC1 genetic and pharmacological inhibition, xenograft models\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with genetic and pharmacological mTORC1 epistasis, in vivo validation\",\n      \"pmids\": [\"30830877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LKB1 directly interacts with and phosphorylates PRMT5 at T132, T139, and T144 residues within the TIM-Barrel domain. Point mutation of T139/144 to A drastically decreases PRMT5 methyltransferase activity, likely due to loss of interaction with regulatory proteins MEP50, pICln, and RiOK1.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, site-directed mutagenesis of PRMT5 phosphorylation sites, methyltransferase activity assay\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay with mutagenesis and functional readout; single lab\",\n      \"pmids\": [\"30289978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"LKB1 catalytically deficient mutants (when introduced into DLD1 colorectal cancer cells) activate cyclin D1 expression through recruitment to response elements in the cyclin D1 promoter, and allow cell cycle progression to S phase. Wild-type LKB1 causes G1 arrest independent of p21 or p53.\",\n      \"method\": \"Introduction of LKB1 WT and catalytic mutants into p21-/-p53-/- colorectal cancer cells, cell cycle analysis, promoter-binding assays, Western blotting\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined cellular assay with promoter binding and cell cycle readout, catalytic mutant comparison; single lab\",\n      \"pmids\": [\"17575127\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LKB1 stabilizes and activates p53 through the JNK pathway in response to cisplatin-induced DNA damage, promoting apoptosis. Conversely, AMPK (downstream of LKB1) negatively regulates cisplatin-induced apoptosis by suppressing ROS-mediated p53 activation, revealing reciprocal regulation of p53 by LKB1 and AMPK in DNA damage response.\",\n      \"method\": \"LKB1 and AMPKα1/α2 double knockout cells, cisplatin treatment, apoptosis assays, p53 stabilization assays, JNK pathway inhibition, antioxidant rescue\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with pathway inhibition and antioxidant rescue; single lab, multiple readouts\",\n      \"pmids\": [\"36077459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LKB1 limits satellite cell proliferation through the AMPK/mTOR pathway but facilitates differentiation through phosphorylation of GSK-3β (a WNT signaling component). Lkb1 null satellite cells fail to maintain quiescence and show accelerated proliferation but reduced differentiation.\",\n      \"method\": \"MyoD-Cre and Pax7-CreER conditional LKB1 knockout mice, satellite cell isolation, proliferation/differentiation assays, pathway inhibitor treatments\",\n      \"journal\": \"Stem cells (Dayton, Ohio)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with pathway-specific readouts; GSK-3β phosphorylation mechanistic evidence moderate-strength\",\n      \"pmids\": [\"25069613\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"STK11/LKB1 is a serine-threonine master kinase that, when activated within a heterotrimeric complex with the pseudokinase STRAD and scaffold protein MO25 (which relocalize it from nucleus to cytoplasm), directly phosphorylates and activates AMPK and at least 13 other AMPK-related kinases (SIKs, MARKs, BRSKs, SADs) to regulate energy homeostasis, cell polarity, proliferation, metabolism, and chromatin state; its activity is controlled by nuclear sequestration via Nur77 or MKP1-p38-mediated retention, by Lys-63-linked ubiquitination via FBXO22, by Golgi-specific recruitment via TBC1D23, and by disruption of the STRAD-MO25 complex through midkine; downstream, LKB1 phosphorylates PRMT5, Sirt1, GSK-3β, and p53/JNK pathway components, suppresses mTORC1, controls chromatin accessibility through SIK-CRTC2-CBP/p300-H3K27ac signaling, promotes RAB7-mediated receptor degradation, and maintains cell-type-specific identity in T cells, beta cells, Schwann cells, and neurons.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"STK11/LKB1 is a serine-threonine master kinase that couples cellular energy status to growth control, cell polarity, metabolism, and chromatin state by directly phosphorylating and activating AMPK and a family of 14 AMPK-related kinases [#0, #2]. Its catalytic activity and subcellular distribution are set by assembly into a heterotrimeric complex with the pseudokinase STRAD and the armadillo-repeat scaffold MO25, which activates LKB1 independently of T-loop phosphorylation and relocalizes it from nucleus to cytoplasm; many cancer-derived point mutants fail to engage this complex [#1]. Genetic epistasis in vivo confirms that LKB1 signals through AMPK to coordinate epithelial polarity and proliferation with energy supply [#3], and through downstream branches it restricts mTORC1 to limit proliferation and tumorigenesis [#26] and activates SIK kinases that constitute a core tumor-suppressive axis [#10]. LKB1 governs chromatin and transcriptional programs: loss reprograms chromatin accessibility and, via SOX17, drives metastatic epigenetic states [#14], upregulates serine-one-carbon metabolism and DNA methylation when combined with KRAS [#13], and de-represses CRTC2-CREB inflammatory gene expression through H3K27ac deposition [#11]. Beyond canonical signaling, LKB1 maintains cell-type identity and homeostasis in Treg cells via Foxp3 stabilization [#15], TH17 cells via mitochondrial-TCA coupling [#16], beta cells [#5], Schwann cells [#23], and neurons [#22, #24], and supports vesicular trafficking through GTP-RAB7-dependent receptor degradation [#6]. LKB1 activity is further tuned by nuclear sequestration through Nur77 [#4] and an MKP1-p38 axis [#20], by FBXO22-mediated Lys-63 ubiquitination [#7], by Golgi recruitment via TBC1D23 [#17], and by disruption of the STRAD-MO25 complex by midkine [#19]. Additional substrates and partners include PRMT5 [#27], Sirt1 [#8], GSK-3\\u03b2 [#30], and the p53/JNK DNA-damage axis [#29].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established how LKB1 is switched on and positioned in the cell, answering why an apparently constitutive kinase requires partners for activity and localization.\",\n      \"evidence\": \"Point mutagenesis of 34 cancer mutants, Co-IP, kinase assays, and imaging of the LKB1-STRAD-MO25 complex\",\n      \"pmids\": [\"15561763\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of activation refined only later\", \"Does not address tissue-specific regulators of complex assembly\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Consolidated LKB1 as the upstream kinase for AMPK and 14 related kinases, defining the breadth of its substrate family across metabolism, polarity, and proliferation.\",\n      \"evidence\": \"Review of biochemical reconstitution and substrate phosphorylation assays\",\n      \"pmids\": [\"16756488\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which AMPK-related kinases dominate in which tissue not resolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrated in vivo that LKB1 acts through AMPK to coordinate epithelial polarity and proliferation with energy status, moving beyond in vitro phosphorylation to physiological output.\",\n      \"evidence\": \"Drosophila lkb1/AMPKalpha genetics with phosphomimetic rescue epistasis\",\n      \"pmids\": [\"17470638\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"AMPK-independent LKB1 functions not addressed here\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Revealed a kinase-independent LKB1 activity controlling cyclin D1 transcription and G1 arrest, indicating LKB1 outputs are not solely catalytic.\",\n      \"evidence\": \"WT vs catalytic-mutant LKB1 introduced into p21-/-p53-/- colorectal cells with promoter-binding and cell-cycle assays\",\n      \"pmids\": [\"17575127\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Mechanism of LKB1 recruitment to the cyclin D1 promoter not defined\", \"Generality across cell types unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Dissected LKB1 outputs in a physiological tissue into separable mTOR, Par1b, and AMPK branches governing beta cell size, polarity, and insulin secretion.\",\n      \"evidence\": \"Beta cell-specific conditional knockout with pathway-specific genetic dissection\",\n      \"pmids\": [\"19808022\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How LKB1 partitions among branches in a single cell not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified nuclear sequestration by Nur77 as a regulated switch controlling cytoplasmic LKB1 availability and AMPK activation in metabolic control.\",\n      \"evidence\": \"Co-IP, fractionation, kinase assays, and Nur77 knockout mice with glucose assays plus TMPA ligand\",\n      \"pmids\": [\"22983157\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signals that release LKB1 physiologically beyond TMPA not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined a kinase-dependent LKB1 role in vesicular trafficking by showing direct binding to active RAB7 to route the angiogenic receptor NRP-1 to lysosomal degradation.\",\n      \"evidence\": \"GTP/GDP-RAB7 form-specific pulldowns, siRNA rescue, and tumor xenografts\",\n      \"pmids\": [\"25180605\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether LKB1 phosphorylates a trafficking substrate not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed LKB1 controls polarized transporter trafficking and hepatocyte canalicular architecture through a PKA-dependent, AMPK-independent route.\",\n      \"evidence\": \"Liver-specific knockout with FRAP, particle tracking, and cAMP/PKA rescue\",\n      \"pmids\": [\"24643070\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct LKB1 substrate for ABCB11 trafficking unidentified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Linked LKB1 to genome protection via an AMPK-independent ROS-limiting cdc42-PAK1-p38-ATF2 axis enhancing antioxidant enzymes.\",\n      \"evidence\": \"LKB1 KO/re-expression with ROS, DNA damage assays, and LKB1-PAK1 Co-IP\",\n      \"pmids\": [\"25263448\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Whether LKB1 phosphorylates PAK1 directly not shown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Connected LKB1 to homology-directed DNA repair through AMPK-dependent control of HuR localization stabilizing BRCA1 mRNA.\",\n      \"evidence\": \"LKB1 knockdown/overexpression with HuR localization, mRNA stability, and HDR reporter assays\",\n      \"pmids\": [\"25488815\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct phosphorylation event in the HuR axis not mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established that LKB1 maintains neuronal synaptic stability and Schwann cell axon support, extending its role to nervous-system homeostasis with differing AMPK dependence.\",\n      \"evidence\": \"Cell-type-specific conditional knockouts in rod photoreceptors and Schwann cells with morphology, ERG, and metabolic profiling\",\n      \"pmids\": [\"25086610\", \"25195104\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream effectors in Schwann cells beyond metabolic rewiring not fully defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed LKB1 controls satellite cell quiescence via AMPK/mTOR and differentiation via GSK-3beta phosphorylation, separating proliferation from differentiation outputs.\",\n      \"evidence\": \"Conditional knockouts with proliferation/differentiation assays and pathway inhibitors\",\n      \"pmids\": [\"25069613\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Directness of GSK-3beta phosphorylation moderately supported\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined an LKB1-SIK-CRTC2 axis controlling inflammatory transcription through CBP/p300-mediated H3K27ac, linking the kinase to chromatin-level gene regulation.\",\n      \"evidence\": \"LKB1 deletion with H3K27ac ChIP, transcriptomics, and CRTC2 manipulation\",\n      \"pmids\": [\"37172591\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct SIK targets within the inflammatory program not enumerated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed STRADalpha stabilizes LKB1 protein via cytoplasmic compartmentalization, separating STRAD's stabilizing and axogenic functions.\",\n      \"evidence\": \"In vivo STRAD conditional expression in developing cortex with LKB1 protein-level readouts\",\n      \"pmids\": [\"24594058\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Mechanism of compartment-dependent stabilization unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Revealed that LKB1 loss with KRAS rewires serine-one-carbon metabolism and DNA methylation, connecting the kinase to metabolic-epigenetic vulnerability.\",\n      \"evidence\": \"Genetically engineered mouse models with transcriptomics, metabolomics, and bisulfite sequencing plus pharmacological validation\",\n      \"pmids\": [\"27799657\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"mTOR-dependence dissected, but direct LKB1 substrate driving methylation not identified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established LKB1 as a guardian of Treg lineage identity by preventing STAT4-driven CNS2 methylation to stabilize Foxp3 and augmenting TGF-beta signaling.\",\n      \"evidence\": \"T cell-specific conditional knockout with bisulfite sequencing and signaling assays\",\n      \"pmids\": [\"28621313\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether LKB1 acts via AMPK-family kinases in this context not specified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified PRMT5 as a direct LKB1 substrate, with phosphorylation in the TIM-barrel domain required for methyltransferase activity, expanding LKB1 substrates beyond the AMPK family.\",\n      \"evidence\": \"Co-IP, in vitro kinase assay, site mutagenesis, and methyltransferase activity assays\",\n      \"pmids\": [\"30289978\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Cellular consequences of PRMT5 phosphorylation not fully mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed an LKB1-SIK1/SIK2 pathway ensures dendritic Robo2 localization to enforce Purkinje cell dendrite self-avoidance, a discrete neuronal patterning role.\",\n      \"evidence\": \"Conditional knockout with Robo2 localization imaging and rescue plus SIK downstream validation\",\n      \"pmids\": [\"30208308\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SIKs control Robo2 trafficking molecularly not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placed SIK family kinases as critical effectors of LKB1 tumor suppression in KRAS-driven lung adenocarcinoma via combinatorial in vivo genetics.\",\n      \"evidence\": \"CRISPR/Cas9 combinatorial knockout with histology and gene-expression epistasis\",\n      \"pmids\": [\"31350327\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of individual SIKs not separated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified FBXO22-mediated Lys-63 polyubiquitination as a post-translational brake on LKB1 kinase activity promoting NSCLC growth.\",\n      \"evidence\": \"Co-IP, linkage-specific ubiquitination assays, and kinase/functional validation in cells and xenografts\",\n      \"pmids\": [\"31217475\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Ubiquitination site(s) on LKB1 not mapped\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated LKB1 restrains periosteal progenitor proliferation and osteogenic tumor formation through mTORC1, generalizing its mTOR-suppressive tumor-suppressor role to skeletal tissue.\",\n      \"evidence\": \"Ctsk-Cre conditional knockout with raptor deletion and mTORC1 inhibitor epistasis\",\n      \"pmids\": [\"30830877\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether AMPK contributes upstream of mTORC1 here not dissected\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established LKB1 as a master regulator of chromatin accessibility whose loss activates SOX17 to drive metastatic epigenetic reprogramming.\",\n      \"evidence\": \"CRISPR screening with single-cell ATAC/RNA-seq and SOX17 gain/loss in vivo metastasis models\",\n      \"pmids\": [\"34341533\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signaling link from LKB1 loss to SOX17 induction not fully defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified Sirt1 as a direct LKB1 substrate whose phosphorylation relieves DBC1 inhibition to drive mitochondrial biogenesis, adding a metabolic substrate.\",\n      \"evidence\": \"Resveratrol-stimulated binding, fluorometric Sirt1 activity assays, and phospho-site mutagenesis\",\n      \"pmids\": [\"34216621\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"In vivo relevance of Sirt1 phosphorylation not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined compartment-specific activation of LKB1 at the Golgi via TBC1D23, showing localized AMPK activation matters for development.\",\n      \"evidence\": \"Co-IP, fractionation, Golgi-targeted LKB1 rescue in zebrafish neurodevelopment\",\n      \"pmids\": [\"38413626\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between Golgi and cytoplasmic LKB1 pools not quantified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed copper-loaded SCO1 tethers LKB1 to AMPK, revealing copper as a signaling input to LKB1-AMPK control of lipid catabolism.\",\n      \"evidence\": \"Co-IP of the ternary complex, copper-loading assays, AMPK activity, and Cp-ablated mice\",\n      \"pmids\": [\"36261001\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Stoichiometry and physiological copper range not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified intracellular midkine as a disruptor of the LKB1-STRAD-MO25 complex that dampens AMPK activation, adding a complex-disassembly regulatory mode.\",\n      \"evidence\": \"Co-IP with LKB1/STRAD and AMPK activity under glucose/2-DG stress\",\n      \"pmids\": [\"35487917\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Binding interface on the complex not mapped\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed LKB1 couples mitochondrial membrane integrity to TH17 cytokine output by rectifying TCA glutamine flux and NADH/NAD+ balance.\",\n      \"evidence\": \"T cell-specific deletion with multi-omics, OPA1 deletion, and cytokine assays\",\n      \"pmids\": [\"36171294\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct LKB1 substrate in the metabolic-cytokine link not pinpointed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealed reciprocal control of p53 in DNA damage, with LKB1 stabilizing p53 via JNK while downstream AMPK suppresses ROS-mediated p53 activation.\",\n      \"evidence\": \"LKB1 and AMPK double knockouts with cisplatin, JNK inhibition, and antioxidant rescue\",\n      \"pmids\": [\"36077459\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct vs indirect LKB1-JNK linkage not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined an MKP1-p38-LKB1 axis controlling LKB1 nuclear export, providing a stress-responsive localization switch relevant to NASH.\",\n      \"evidence\": \"Hepatic MKP1 conditional knockout with fractionation, phospho-specific antibodies, and NASH diet models\",\n      \"pmids\": [\"37669951\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the LKB1 export phospho-site not fully characterized in this corpus\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How LKB1 selects among its diverse substrate and localization-regulator programs in a given cell type, and which inputs dominate physiologically, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model integrating nuclear sequestration, ubiquitination, Golgi recruitment, and complex disruption\", \"Substrate-specificity determinants beyond the AMPK family not mapped\", \"Structural basis for context-dependent activation incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 8, 27]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 2, 3, 27]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [14, 28]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 4, 20]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 4, 25]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 3, 13, 16, 18]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [7, 10, 13, 14, 26]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 4, 17, 20]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [11, 13, 14]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [11, 15, 16]}\n    ],\n    \"complexes\": [\"LKB1-STRAD-MO25 heterotrimeric complex\"],\n    \"partners\": [\"STRAD\", \"MO25\", \"Nur77\", \"RAB7\", \"FBXO22\", \"TBC1D23\", \"SCO1\", \"MDK\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}