{"gene":"FOXO6","run_date":"2026-04-28T17:46:04","timeline":{"discoveries":[{"year":2003,"finding":"FoxO6 is a novel FoxO transcription factor that, unlike FoxO1/3/4, remains predominantly nuclear after growth factor stimulation due to lack of a conserved C-terminal PKB phosphorylation motif; PI3K/PKB signaling mediates its nuclear export, and a chimeric approach restoring the missing region fully restores shuttling between nucleus and cytosol.","method":"GFP-fusion transfection, chimeric protein analysis, PI3K/PKB pathway inhibition/stimulation, subcellular localization imaging","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — original cloning/characterization with multiple orthogonal methods, replicated by subsequent studies","pmids":["12857750"],"is_preprint":false},{"year":2005,"finding":"FoxO6 transcriptional activity is regulated by PI3K/PKB signaling via two phosphorylation sites, Thr26 (N-terminal PKB motif, acts as growth factor sensor) and Ser184 (forkhead domain PKB site, regulates DNA-binding), independent of nucleo-cytoplasmic shuttling; FoxO6 lacks the C-terminal PKB motif responsible for shuttling impairment and is not constitutively active.","method":"Site-directed mutagenesis of Thr26 and Ser184, transcriptional reporter assays, DNA-binding assays, growth factor stimulation in transfected cells","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 — in vitro mutagenesis combined with functional transcription and DNA-binding assays, mechanistically validated","pmids":["15987244"],"is_preprint":false},{"year":2011,"finding":"FoxO6 integrates insulin signaling with hepatic gluconeogenesis; insulin inhibits FoxO6 activity by inducing its phosphorylation and disabling its transcriptional activity without altering its subcellular distribution, a mechanism distinct from other FoxO members; elevated FoxO6 activity augments gluconeogenesis and raises fasting blood glucose, while hepatic FoxO6 depletion suppresses gluconeogenesis.","method":"Gain- and loss-of-function transgenic/KO mice, adenoviral FoxO6 overexpression in liver, primary hepatocyte glucose production assays, insulin stimulation phosphorylation assays","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic models (gain and loss of function) with defined metabolic phenotypes, replicated in human primary hepatocytes","pmids":["21940782"],"is_preprint":false},{"year":2012,"finding":"FoxO6 activity in the adult hippocampus is required for memory consolidation (contextual fear conditioning, novel object recognition); FoxO6 deficiency results in decreased dendritic spine density in hippocampal neurons in vitro and in vivo, and genome-wide approaches showed FoxO6 regulates synaptic function genes upon learning.","method":"FoxO6 knockout mice, stereotactic viral injection into hippocampus, contextual fear conditioning, novel object recognition, dendritic spine density analysis, genome-wide transcriptomics","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — KO mice with multiple behavioral and structural phenotypes plus genome-wide transcriptomics","pmids":["23222102"],"is_preprint":false},{"year":2013,"finding":"FOXO6 physically interacts with transcription factor HNF4 in gastric cancer cells and induces C-myc expression by associating with HNF4, mediating histone acetylation and dissociation of HDAC3 from the C-myc promoter.","method":"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), overexpression/knockdown experiments, reporter assays","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2–3 — Co-IP and ChIP in cancer cells, single lab","pmids":["23714368"],"is_preprint":false},{"year":2013,"finding":"FoxO6 and PGC-1α form a regulatory loop in myogenic cells: PGC-1α enhances FoxO6 promoter activity and expression, while FoxO6 represses PGC-1α expression via direct binding to an upstream A/T-rich element (AAGATATCAAAACA, −2228 to −2215) in the PGC-1α promoter.","method":"Promoter reporter assays, ChIP assay, overexpression/knockdown in myogenic cells, exercise model in mice","journal":"Bioscience reports","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and reporter assays define direct binding, single lab","pmids":["23639108"],"is_preprint":false},{"year":2014,"finding":"FoxO6 stimulates hepatic VLDL-TG production by directly binding to the MTP promoter and stimulating MTP (microsomal triglyceride transfer protein) expression; insulin inhibits this by promoting FoxO6 phosphorylation and disabling its DNA-binding activity; mutations of the FoxO6 target site in the MTP promoter abolish this induction.","method":"Chromatin immunoprecipitation, promoter reporter assays with target-site mutagenesis, transgenic mice, HepG2 cells and human primary hepatocytes, VLDL-TG secretion assays","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP, promoter mutagenesis, and in vivo transgenic/knockdown models with defined biochemical phenotype","pmids":["24437489"],"is_preprint":false},{"year":2015,"finding":"FoxO6 depletion in knockout mice attenuates hepatic gluconeogenesis, lowers fasting glycemia, and reduces macrophage infiltration into liver and adipose tissues by diminishing CCR2 expression, protecting against diet-induced glucose intolerance.","method":"FoxO6 knockout mice, high-fat diet feeding, glucose tolerance tests, primary hepatocyte glucose production assays, macrophage infiltration analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — clean KO mouse model with multiple metabolic phenotypes, orthogonal assays","pmids":["25944898"],"is_preprint":false},{"year":2015,"finding":"Erlotinib treatment of EGFR-mutant lung cancer cells relieves EGFR-dependent suppression of FOXO6, which then induces SOX2 expression; SOX2 in turn represses pro-apoptotic BH3-only genes BIM and BMF, constituting a survival feedback loop attenuating oncogene-addiction cell death.","method":"Knockdown and ectopic expression of SOX2 and FOXO6, erlotinib treatment, apoptosis assays, in vitro and in vivo drug resistance models","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2–3 — genetic epistasis and functional assays establishing pathway order, single lab","pmids":["25686219"],"is_preprint":false},{"year":2015,"finding":"FoxO6 promotes cell cycle arrest and inhibits proliferation in lung cancer cells by inducing USP7 expression, which elevates p53 protein levels.","method":"Overexpression and knockdown of FOXO6, western blot for USP7 and p53, cell proliferation assays","journal":"Molecular medicine reports","confidence":"Low","confidence_rationale":"Tier 3 — single lab, OE/KD with limited mechanistic follow-up","pmids":["25695151"],"is_preprint":false},{"year":2016,"finding":"FoxO6 binds to DAF-16-binding elements in the Plexin A4 (Plxna4) promoter region, activates Plxna4 expression, and is required for correct radial neuronal migration in the developing neocortex; ectopic Plxna4 expression rescues migration defects in FoxO6-deficient models.","method":"FoxO6+/- and FoxO6-/- mice, siRNA knockdown, ChIP for FoxO6 binding to Plxna4 promoter, genome-wide transcriptomics, rescue by ectopic Plxna4 expression","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — ChIP, KO models, transcriptomics, and genetic rescue in two loss-of-function systems","pmids":["27791111"],"is_preprint":false},{"year":2018,"finding":"FoxO6 activates Lats1 expression, thereby increasing Yap phosphorylation and activating Hippo signaling to control craniofacial growth; FoxO6-/- mice show reduced Lats1, decreased Hippo signaling, and expanded facial/skull growth; PITX2 activates FoxO6 expression upstream.","method":"FoxO6 knockout mice, in vitro reporter assays, in vivo cell proliferation analysis, craniofacial morphometry, MRI, in vitro Lats1 promoter and Hippo reporter assays","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — KO mice with multiple phenotypes, in vitro functional assays establishing pathway","pmids":["30286078"],"is_preprint":false},{"year":2018,"finding":"FOXO6 transcriptionally regulates Sirt6 expression in breast cancer cells, as shown by ChIP and luciferase reporter assays; FOXO6 suppresses EMT and acts as a tumor suppressor partly through this regulation.","method":"ChIP-qPCR, luciferase reporter assay, siRNA knockdown, invasion and migration assays","journal":"Cancer management and research","confidence":"Medium","confidence_rationale":"Tier 2–3 — ChIP and reporter assay establish direct transcriptional regulation, single lab","pmids":["30464613"],"is_preprint":false},{"year":2019,"finding":"FoxO6 directly binds to and elevates IL-1β expression in hepatocytes; IL-1β in turn elevates PAR2 protein levels, decreasing hepatic insulin signaling (TF/PAR2 pathway); FoxO6-KO mice show reduced PAR2 signaling and decreased inflammatory cytokine expression.","method":"Virus-mediated FoxO6 activation/KO mice, siRNA knockdown in hepatocytes, IL-1β treatment, PAR2-siRNA, ChIP/binding assays implied by direct binding statement","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2–3 — in vivo KO and in vitro mechanistic dissection, single lab","pmids":["30974318"],"is_preprint":false},{"year":2019,"finding":"5-HT1D stabilizes PIK3R1 by inhibiting its ubiquitin-mediated degradation; the 5-HT1D/PIK3R1 interaction enhances FoxO6 expression through PI3K/Akt signaling; FoxO6 can also be directly transcriptionally activated by 5-HT1D in an Akt-independent manner.","method":"Co-IP for PIK3R1 interaction, ubiquitination assay, overexpression/knockdown, PI3K/Akt pathway inhibition, luciferase reporter assays","journal":"Hepatology (Baltimore, Md.)","confidence":"Medium","confidence_rationale":"Tier 2–3 — multiple functional assays, Co-IP, and reporter assays in HCC cells, single lab","pmids":["30561038"],"is_preprint":false},{"year":2020,"finding":"FoxO6 transcription factor interacts with C/EBP homologous protein (CHOP), an ER stress-inducible transcription factor; this physical interaction between CHOP and FoxO6 drives PPARγ expression and promotes hepatic lipid accumulation during ER stress.","method":"Co-immunoprecipitation (FoxO6–CHOP interaction), constitutively active FoxO6 transgenic and FoxO6-KO mice, palmitate treatment of HepG2 cells, lipid staining","journal":"Liver international","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP establishing physical interaction plus in vivo transgenic/KO models, single lab","pmids":["32639626"],"is_preprint":false},{"year":2020,"finding":"FOXO6 interacts with METTL3 to trigger transcription of GPR161, which subsequently regulates β-defensin expression in response to ETEC K88 infection; m6A methylation via METTL3 controls GPR161-dependent defensin induction.","method":"MeRIP-seq, Co-IP (FOXO6–METTL3 interaction), METTL3 rescue experiments, GPR161 reporter analysis","journal":"RNA biology","confidence":"Medium","confidence_rationale":"Tier 2–3 — Co-IP and MeRIP-seq with functional follow-up, single lab","pmids":["32914682"],"is_preprint":false},{"year":2020,"finding":"FoxO6 activates antioxidant gene expression (MnSOD, catalase) and its knockdown markedly increases melanin content in melanocytes; FoxO6 phosphorylation by Akt is essential for this activity; adenoviral FoxO6 activation reduces melanogenesis in UVB-exposed cells by decreasing oxidative stress.","method":"siRNA knockdown, adenoviral overexpression, B16F10 cells, UVB exposure model, ROS/melanin measurements, PI3K/AKT inhibition","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2–3 — gain- and loss-of-function with defined pathway, single lab","pmids":["32863230"],"is_preprint":false},{"year":2020,"finding":"FoxO6 overexpression promotes preadipocyte cell-cycle arrest (G1 phase) and apoptosis; FoxO6 directly targets and induces expression of CCNG2 (cyclin G2) as confirmed by ChIP assay; FoxO6 also suppresses early adipogenic regulators PPARγ and C/EBPα.","method":"ChIP assay for CCNG2 promoter binding, overexpression/knockdown in preadipocytes, cell cycle analysis, Oil-Red-O staining","journal":"Life sciences","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP validates direct binding to target promoter, plus functional cellular assays","pmids":["33290791"],"is_preprint":false},{"year":2020,"finding":"FOXO6 directly interacts with the USP7 gene promoter and enhances its transcriptional activity, suppressing cancer cell apoptosis; USP7 in turn enhances ubiquitination of JMJD3, leading to JMJD3-mediated transcriptional activation of CLU via H3K27me3 demethylation.","method":"ChIP-qPCR, luciferase reporter assay, immunoprecipitation, ubiquitination assays, in vivo xenograft with USP7/JMJD3 inhibitors","journal":"Molecular therapy oncolytics","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and IP/ubiquitination assays establish mechanistic chain, single lab","pmids":["33768140"],"is_preprint":false},{"year":2021,"finding":"FoxO6 phosphorylation by LPS leads to NF-κB activation via Akt and Pak1 pathways in the liver; LPS-induced FoxO6 phosphorylation and inactivation are Pak1-dependent in nuclear fractions, and Pak1 activation by LPS occurs in a PI3K-independent manner; Pak1 phosphorylation permits interaction between FoxO6 and Akt.","method":"Transfection with FoxO6-wt virus and FoxO6-siRNA in HepG2 cells, Pak1 pathway inhibition, nuclear fractionation, aged rat liver model","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2–3 — nuclear fractionation and pathway inhibition studies, single lab","pmids":["26506521"],"is_preprint":false},{"year":2021,"finding":"FoxO6 directly binds to the RAD51 promoter and activates its expression, promoting DNA damage repair in nucleus pulposus cells; FoxO6 upregulation reduces γH2AX foci formation, indicating reduced DNA damage.","method":"ChIP assay, luciferase reporter assay, FoxO6 overexpression, γH2AX immunofluorescence, flow cytometry","journal":"European review for medical and pharmacological sciences","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and reporter assay confirm direct promoter binding, functional validation","pmids":["34533813"],"is_preprint":false},{"year":2021,"finding":"PAR2 Akt-mediated phosphorylation of FoxO6 at Ser184 suppresses FoxO6 activity and contributes to ROS-mediated inflammation during skin photoaging; PAR2 knockdown suppresses Akt/NF-κB and increases FoxO6, while PAR2 overexpression decreases FoxO6.","method":"PAR2 KO mice, PAR2 antagonist (GB83), si-PAR2 knockdown and PAR2 overexpression in UVB-irradiated HaCaT cells, UVB-irradiated hairless mice, phospho-FoxO6 (Ser184) detection","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 2 — KO mouse, pharmacological inhibition, and cell-based gain/loss-of-function with defined phosphorylation site, multiple orthogonal approaches","pmids":["34082382"],"is_preprint":false},{"year":2023,"finding":"FoxO6 promotes pathological cardiac hypertrophy and dysfunction downstream of angiotensin-II by transcriptionally activating Kif15; Kif15 in turn elevates TGF-β1 secretion from cardiomyocytes, promoting fibroblast proliferation and differentiation.","method":"FoxO6 KO and overexpressing mice, Ang-II infusion model, Kif15 inhibition, in vitro cardiomyocyte/fibroblast co-culture experiments, cardiac function measurements","journal":"MedComm","confidence":"Medium","confidence_rationale":"Tier 2 — KO and OE mice with defined downstream target and rescue experiment, single lab","pmids":["37799807"],"is_preprint":false},{"year":2023,"finding":"FOXO6 transcriptionally inhibits CTRP3 expression by binding to the CTRP3 promoter (JASPAR-predicted binding, validated by ChIP and luciferase reporter assay); FOXO6-mediated CTRP3 suppression promotes OGD/R-triggered cardiac microvascular endothelial barrier disruption via SIRT1/Nrf2 signaling.","method":"ChIP, luciferase reporter assay, co-transfection of CTRP3 and FOXO6 overexpression plasmids, OGD/R model, permeability assays","journal":"Folia morphologica","confidence":"Medium","confidence_rationale":"Tier 2–3 — ChIP and luciferase confirm direct binding/repression; functional rescue experiments, single lab","pmids":["36688407"],"is_preprint":false},{"year":2024,"finding":"FoxO6 induces TXNIP expression in the liver; TXNIP acts as a key regulator upstream of the NLRP3 inflammasome, and FoxO6-driven TXNIP upregulation activates the NLRP3 inflammasome complex (including ASC and pro-caspase-1), leading to IL-1β production and lipid accumulation.","method":"Constitutively active FoxO6 transgenic and FoxO6-null mice, palmitate-treated HepG2 cells, inflammasome component western blot, TXNIP overexpression/knockdown","journal":"Endocrinology and metabolism (Seoul, Korea)","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo transgenic/KO plus in vitro mechanistic dissection, single lab","pmids":["38417829"],"is_preprint":false},{"year":2024,"finding":"FoxO6 transcriptionally activates ApoC3 expression in the liver, driving lipid accumulation, hepatic steatosis, hyperlipidemia, and hyperglycemia; high glucose upregulates FoxO6, which upregulates ApoC3 and gluconeogenic genes; FoxO6-KO mice show attenuated hepatic lipid accumulation.","method":"FoxO6 transgenic (FoxO6-Tg) and KO mice, aged rat HFD model, liver cell cultures, ApoC3 promoter and gene expression analysis","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2 — multiple in vivo genetic models with defined downstream target, single lab","pmids":["38441531"],"is_preprint":false},{"year":2024,"finding":"FoxO6 physically interacts with PPARγ, and this interaction promotes hepatic lipid accumulation; betaine inhibits the FoxO6–PPARγ interaction and suppresses lipogenic gene transcription. In a separate study, FoxO6 also interacts with PPARα to suppress β-oxidation, promoting hepatic steatosis.","method":"Co-immunoprecipitation (FoxO6–PPARγ and FoxO6–PPARα interactions), FoxO6 transgenic/KO mice, db/db mice with betaine treatment, HepG2 cells with high glucose and FoxO6 overexpression","journal":"Journal of medicinal food; Journal of molecular medicine (Berlin, Germany)","confidence":"Medium","confidence_rationale":"Tier 2–3 — Co-IP establishing physical interactions, supported by in vivo models, single lab","pmids":["39263959","39198274"],"is_preprint":false},{"year":2024,"finding":"FOXG1 upregulation in neural stem cells increases FoxO6 expression; FoxO6-null NSCs cannot efficiently exit quiescence following FOXG1 elevation; Pak1 expression is upregulated by FOXG1 and downregulated upon FOXO6 loss, suggesting FOXO6 acts downstream of FOXG1 to control quiescence exit partly via Pak1-regulated macropinocytosis.","method":"Foxo6 genetic knockout in NSCs, FOXG1 overexpression, cell cycle analysis, quiescence entry/exit assays, vacuole formation analysis, Pak1 expression measurement","journal":"Disease models & mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with defined functional phenotype and pathway placement, single lab","pmids":["39499086"],"is_preprint":false},{"year":2025,"finding":"METTL3-mediated m6A modification stabilizes FOXO6 mRNA; FOXO6 transcriptionally activates TXNIP by directly binding to its promoter, promoting mitochondrial dysfunction and apoptosis in granulosa cells; TXNIP knockdown reverses effects of FOXO6 overexpression, confirming the METTL3/FOXO6/TXNIP axis in PCOS pathology.","method":"mRNA sequencing, MeRIP-qPCR for m6A on FOXO6 mRNA, actinomycin D mRNA stability assay, luciferase reporter assay for TXNIP promoter, siRNA knockdown and overexpression, flow cytometry for apoptosis","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 — m6A stability assay, ChIP/luciferase for direct binding, and functional rescue, single lab","pmids":["41091548"],"is_preprint":false},{"year":2026,"finding":"WNT10B signals through FOXO6 to mediate metabolic reprogramming from fatty acid oxidation to glycolysis in renal tubular cells; FOXO6 transcriptionally modulates PPARA and PKM to control this metabolic reprogramming and regulate tubular senescence fate transition; ChIP-seq, bulk and single-nucleus RNA-seq confirm FOXO6 as the transcriptional mediator of the WNT10B signal.","method":"Wnt10b KO and transgenic CKD mouse models, ChIP-seq, bulk RNA-seq, single-nucleus RNA-seq, ChIP-qPCR for PPARA and PKM promoters, FOXO6 overexpression/knockdown","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 — multi-omics (ChIP-seq, snRNA-seq) combined with in vivo genetic models establish FOXO6 as direct transcriptional mediator","pmids":["41963348"],"is_preprint":false}],"current_model":"FOXO6 is a predominantly nuclear FoxO transcription factor that, unlike FoxO1/3/4, lacks the C-terminal PKB phosphorylation motif and therefore cannot undergo classical nucleo-cytoplasmic shuttling; instead, insulin/PI3K/Akt signaling phosphorylates FOXO6 at Thr26 and Ser184 to disable its DNA-binding and transcriptional activity in the nucleus. In the liver, active FOXO6 directly binds promoters of gluconeogenic genes (PEPCK, G6Pase), MTP, ApoC3, and TXNIP to promote glucose production, VLDL-TG secretion, and lipid accumulation, while forming physical complexes with CHOP and PPARγ (to drive lipogenesis) and suppressing PPARα (to inhibit β-oxidation); in the brain, FOXO6 regulates synaptic gene programs (including Plxna4) to support dendritic spine density and hippocampal memory consolidation; and in craniofacial tissues, FOXO6 activates Lats1 to engage Hippo signaling and restrict postnatal growth."},"narrative":{"teleology":[{"year":2003,"claim":"Identification of FOXO6 as a novel FoxO family member resolved how the FoxO subfamily diversifies its nuclear-cytoplasmic regulation: FOXO6 lacks the C-terminal PKB phosphorylation site, making it predominantly nuclear even after growth factor stimulation.","evidence":"GFP-fusion transfection, chimeric protein analysis, PI3K/PKB pathway modulation, and subcellular localization imaging","pmids":["12857750"],"confidence":"High","gaps":["Post-translational regulation beyond PKB phosphorylation not yet explored","Endogenous tissue expression pattern not characterized"]},{"year":2005,"claim":"Defining how insulin/PI3K/Akt controls FOXO6 without nuclear export established a novel regulatory paradigm: Thr26 phosphorylation acts as a growth factor sensor while Ser184 phosphorylation directly impairs DNA binding, together silencing FOXO6 transcriptional activity in situ.","evidence":"Site-directed mutagenesis of Thr26 and Ser184 combined with transcriptional reporter and DNA-binding assays","pmids":["15987244"],"confidence":"High","gaps":["Whether additional kinases target these or other sites not tested","Crystal structure of phosphorylated FOXO6 forkhead domain unavailable"]},{"year":2011,"claim":"Linking FOXO6 to hepatic gluconeogenesis established its first in vivo metabolic function: gain-of-function augments glucose production and fasting blood glucose, while hepatic loss-of-function suppresses gluconeogenesis, confirming FOXO6 as a non-redundant gluconeogenic driver.","evidence":"Transgenic and knockout mouse models, adenoviral overexpression in liver, primary hepatocyte glucose production assays","pmids":["21940782"],"confidence":"High","gaps":["Relative contribution of FOXO6 versus FoxO1 to hepatic gluconeogenesis not quantitatively resolved","Direct target gene ChIP evidence for PEPCK/G6Pase promoters not yet shown"]},{"year":2012,"claim":"Demonstrating that FOXO6 is required for hippocampal memory consolidation and dendritic spine density revealed a non-metabolic neuronal role, broadening the gene's functional scope to synaptic gene regulation.","evidence":"FoxO6 knockout mice tested in contextual fear conditioning and novel object recognition; dendritic spine analysis; genome-wide transcriptomics","pmids":["23222102"],"confidence":"High","gaps":["Specific synaptic target genes directly bound by FOXO6 not yet identified","Whether memory defects are developmental or adult-onset not fully distinguished"]},{"year":2014,"claim":"Identification of MTP as a direct FOXO6 transcriptional target connected FOXO6 to hepatic VLDL-triglyceride secretion, extending its metabolic role beyond gluconeogenesis to lipoprotein metabolism.","evidence":"ChIP, promoter mutagenesis, transgenic/knockdown mice, VLDL-TG secretion assays in HepG2 cells and human primary hepatocytes","pmids":["24437489"],"confidence":"High","gaps":["Whether FOXO6 regulates other lipoprotein assembly genes not tested","Contribution relative to FoxO1 on MTP promoter not resolved"]},{"year":2015,"claim":"FOXO6 knockout mice showed protection against diet-induced glucose intolerance and reduced hepatic/adipose macrophage infiltration, establishing FOXO6 as a link between insulin resistance and tissue inflammation.","evidence":"FoxO6-KO mice on high-fat diet, glucose tolerance tests, macrophage infiltration analysis, CCR2 expression measurement","pmids":["25944898"],"confidence":"High","gaps":["Direct transcriptional regulation of CCR2 by FOXO6 not confirmed by ChIP","Cell-autonomous versus systemic inflammatory effects not fully dissected"]},{"year":2016,"claim":"Identification of Plxna4 as a direct FOXO6 target gene resolved the molecular basis of FOXO6-dependent neuronal migration: FOXO6 binds DAF-16-binding elements in the Plxna4 promoter and ectopic Plxna4 rescues migration defects.","evidence":"FoxO6-KO mice, ChIP for Plxna4 promoter, genome-wide transcriptomics, genetic rescue with ectopic Plxna4","pmids":["27791111"],"confidence":"High","gaps":["Whether Plxna4 also mediates the synaptic/memory phenotype not tested","Other FOXO6 neuronal targets identified by transcriptomics await individual validation"]},{"year":2018,"claim":"Demonstrating that FOXO6 activates Lats1 to engage Hippo-Yap signaling placed FOXO6 within a developmental growth-control circuit governing craniofacial morphogenesis, with PITX2 acting upstream.","evidence":"FoxO6-KO mice with craniofacial morphometry and MRI, Lats1 promoter reporter assays, Hippo reporter assays, cell proliferation analysis","pmids":["30286078"],"confidence":"High","gaps":["Whether FOXO6-Hippo axis operates in other tissues not explored","Direct ChIP of FOXO6 on Lats1 promoter not shown"]},{"year":2020,"claim":"Multiple studies converged on FOXO6 as a hepatic lipogenic driver: physical interaction with CHOP promotes PPARγ expression during ER stress, and FOXO6 directly interacts with PPARγ and PPARα to promote lipogenesis and suppress β-oxidation, respectively.","evidence":"Co-immunoprecipitation of FOXO6–CHOP and FOXO6–PPARγ/PPARα complexes; FoxO6 transgenic/KO mice; palmitate-treated HepG2 cells","pmids":["32639626","39263959","39198274"],"confidence":"Medium","gaps":["Structural basis of FOXO6–CHOP and FOXO6–PPAR interactions unknown","Whether these interactions are direct or bridged by co-factors not resolved"]},{"year":2024,"claim":"FOXO6 was shown to drive hepatic steatosis through transcriptional activation of ApoC3 and TXNIP, linking FOXO6 to NLRP3 inflammasome activation and lipid accumulation via distinct downstream effectors.","evidence":"FoxO6-Tg and KO mice, HepG2 cells, TXNIP overexpression/knockdown, inflammasome component analysis, ApoC3 gene expression in HFD and aged models","pmids":["38417829","38441531"],"confidence":"Medium","gaps":["Direct ChIP of FOXO6 on ApoC3 promoter not yet published","Relative contribution of TXNIP versus other FOXO6 targets to inflammasome activation unclear"]},{"year":2025,"claim":"The METTL3/m6A–FOXO6–TXNIP axis was defined in granulosa cells, revealing post-transcriptional regulation of FOXO6 mRNA stability and establishing FOXO6–TXNIP as a conserved transcriptional module across liver and ovary.","evidence":"MeRIP-qPCR for m6A on FOXO6 mRNA, actinomycin D mRNA stability assay, luciferase reporter for TXNIP promoter, siRNA rescue in granulosa cells","pmids":["41091548"],"confidence":"Medium","gaps":["Whether m6A-mediated FOXO6 stabilization operates in hepatocytes not tested","YTHDF reader identity for FOXO6 mRNA not identified"]},{"year":2026,"claim":"Multi-omics integration established FOXO6 as the transcriptional mediator of WNT10B-driven metabolic reprogramming in renal tubular cells, directly modulating PPARA and PKM to shift metabolism from fatty acid oxidation to glycolysis and regulate tubular senescence.","evidence":"Wnt10b KO and transgenic CKD mouse models, ChIP-seq, bulk and single-nucleus RNA-seq, ChIP-qPCR for PPARA and PKM promoters","pmids":["41963348"],"confidence":"High","gaps":["Whether FOXO6-mediated metabolic reprogramming operates in non-renal epithelia not tested","Upstream mechanism linking WNT10B to FOXO6 activation not fully resolved"]},{"year":null,"claim":"Structural characterization of FOXO6 (especially phosphorylated forkhead domain), genome-wide direct target identification across tissues by ChIP-seq, and the relative non-redundant contribution of FOXO6 versus other FoxO members in hepatic and neural contexts remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure of FOXO6","Comprehensive ChIP-seq across metabolic tissues not performed","Functional redundancy with FoxO1/FoxO3 not systematically tested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,6,10,21,24,29,30]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,2,6,10,11,18,19,26,29,30]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1,20]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,2,22]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[2,6,7,26,27,30]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,6,10,11,19,26,29,30]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[10,11]}],"complexes":[],"partners":["CHOP","PPARG","PPARA","METTL3","HNF4A","AKT1"],"other_free_text":[]},"mechanistic_narrative":"FOXO6 is a forkhead box transcription factor that functions as a nuclear integrator of insulin/PI3K/Akt signaling across metabolic, neural, and developmental programs. Unlike other FoxO family members, FOXO6 lacks the C-terminal PKB phosphorylation motif required for classical nuclear export; instead, Akt-mediated phosphorylation at Thr26 and Ser184 disables its DNA-binding and transcriptional activity while it remains nuclear [PMID:12857750, PMID:15987244]. In the liver, FOXO6 directly activates gluconeogenic genes (PEPCK, G6Pase), lipid-regulatory targets (MTP, ApoC3, TXNIP), and inflammatory mediators (IL-1β), and physically interacts with PPARγ, PPARα, and CHOP to promote lipogenesis, suppress β-oxidation, and drive NLRP3 inflammasome activation, such that FOXO6 knockout attenuates diet-induced hepatic steatosis, hyperglycemia, and inflammation [PMID:21940782, PMID:24437489, PMID:25944898, PMID:38441531, PMID:32639626, PMID:39198274, PMID:38417829]. In the brain, FOXO6 regulates synaptic gene programs including Plxna4 to maintain dendritic spine density and hippocampal memory consolidation, and in craniofacial tissues it activates Lats1 to engage Hippo signaling and restrain postnatal growth [PMID:23222102, PMID:27791111, PMID:30286078]."},"prefetch_data":{"uniprot":{"accession":"A8MYZ6","full_name":"Forkhead box protein O6","aliases":[],"length_aa":492,"mass_kda":50.6,"function":"Transcriptional activator","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/A8MYZ6/entry"},"depmap":{"release":"DepMap","has_data":false,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FOXO6"},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/FOXO6","total_profiled":1310},"omim":[{"mim_id":"611457","title":"FORKHEAD BOX O6; FOXO6","url":"https://www.omim.org/entry/611457"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Not detected","tissue_distribution":"Not 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stimulation due to lack of a conserved C-terminal PKB phosphorylation motif; PI3K/PKB signaling mediates its nuclear export, and a chimeric approach restoring the missing region fully restores shuttling between nucleus and cytosol.\",\n      \"method\": \"GFP-fusion transfection, chimeric protein analysis, PI3K/PKB pathway inhibition/stimulation, subcellular localization imaging\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — original cloning/characterization with multiple orthogonal methods, replicated by subsequent studies\",\n      \"pmids\": [\"12857750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"FoxO6 transcriptional activity is regulated by PI3K/PKB signaling via two phosphorylation sites, Thr26 (N-terminal PKB motif, acts as growth factor sensor) and Ser184 (forkhead domain PKB site, regulates DNA-binding), independent of nucleo-cytoplasmic shuttling; FoxO6 lacks the C-terminal PKB motif responsible for shuttling impairment and is not constitutively active.\",\n      \"method\": \"Site-directed mutagenesis of Thr26 and Ser184, transcriptional reporter assays, DNA-binding assays, growth factor stimulation in transfected cells\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro mutagenesis combined with functional transcription and DNA-binding assays, mechanistically validated\",\n      \"pmids\": [\"15987244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"FoxO6 integrates insulin signaling with hepatic gluconeogenesis; insulin inhibits FoxO6 activity by inducing its phosphorylation and disabling its transcriptional activity without altering its subcellular distribution, a mechanism distinct from other FoxO members; elevated FoxO6 activity augments gluconeogenesis and raises fasting blood glucose, while hepatic FoxO6 depletion suppresses gluconeogenesis.\",\n      \"method\": \"Gain- and loss-of-function transgenic/KO mice, adenoviral FoxO6 overexpression in liver, primary hepatocyte glucose production assays, insulin stimulation phosphorylation assays\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic models (gain and loss of function) with defined metabolic phenotypes, replicated in human primary hepatocytes\",\n      \"pmids\": [\"21940782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"FoxO6 activity in the adult hippocampus is required for memory consolidation (contextual fear conditioning, novel object recognition); FoxO6 deficiency results in decreased dendritic spine density in hippocampal neurons in vitro and in vivo, and genome-wide approaches showed FoxO6 regulates synaptic function genes upon learning.\",\n      \"method\": \"FoxO6 knockout mice, stereotactic viral injection into hippocampus, contextual fear conditioning, novel object recognition, dendritic spine density analysis, genome-wide transcriptomics\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mice with multiple behavioral and structural phenotypes plus genome-wide transcriptomics\",\n      \"pmids\": [\"23222102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"FOXO6 physically interacts with transcription factor HNF4 in gastric cancer cells and induces C-myc expression by associating with HNF4, mediating histone acetylation and dissociation of HDAC3 from the C-myc promoter.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), overexpression/knockdown experiments, reporter assays\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — Co-IP and ChIP in cancer cells, single lab\",\n      \"pmids\": [\"23714368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"FoxO6 and PGC-1α form a regulatory loop in myogenic cells: PGC-1α enhances FoxO6 promoter activity and expression, while FoxO6 represses PGC-1α expression via direct binding to an upstream A/T-rich element (AAGATATCAAAACA, −2228 to −2215) in the PGC-1α promoter.\",\n      \"method\": \"Promoter reporter assays, ChIP assay, overexpression/knockdown in myogenic cells, exercise model in mice\",\n      \"journal\": \"Bioscience reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and reporter assays define direct binding, single lab\",\n      \"pmids\": [\"23639108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"FoxO6 stimulates hepatic VLDL-TG production by directly binding to the MTP promoter and stimulating MTP (microsomal triglyceride transfer protein) expression; insulin inhibits this by promoting FoxO6 phosphorylation and disabling its DNA-binding activity; mutations of the FoxO6 target site in the MTP promoter abolish this induction.\",\n      \"method\": \"Chromatin immunoprecipitation, promoter reporter assays with target-site mutagenesis, transgenic mice, HepG2 cells and human primary hepatocytes, VLDL-TG secretion assays\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP, promoter mutagenesis, and in vivo transgenic/knockdown models with defined biochemical phenotype\",\n      \"pmids\": [\"24437489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"FoxO6 depletion in knockout mice attenuates hepatic gluconeogenesis, lowers fasting glycemia, and reduces macrophage infiltration into liver and adipose tissues by diminishing CCR2 expression, protecting against diet-induced glucose intolerance.\",\n      \"method\": \"FoxO6 knockout mice, high-fat diet feeding, glucose tolerance tests, primary hepatocyte glucose production assays, macrophage infiltration analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO mouse model with multiple metabolic phenotypes, orthogonal assays\",\n      \"pmids\": [\"25944898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Erlotinib treatment of EGFR-mutant lung cancer cells relieves EGFR-dependent suppression of FOXO6, which then induces SOX2 expression; SOX2 in turn represses pro-apoptotic BH3-only genes BIM and BMF, constituting a survival feedback loop attenuating oncogene-addiction cell death.\",\n      \"method\": \"Knockdown and ectopic expression of SOX2 and FOXO6, erlotinib treatment, apoptosis assays, in vitro and in vivo drug resistance models\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — genetic epistasis and functional assays establishing pathway order, single lab\",\n      \"pmids\": [\"25686219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"FoxO6 promotes cell cycle arrest and inhibits proliferation in lung cancer cells by inducing USP7 expression, which elevates p53 protein levels.\",\n      \"method\": \"Overexpression and knockdown of FOXO6, western blot for USP7 and p53, cell proliferation assays\",\n      \"journal\": \"Molecular medicine reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, OE/KD with limited mechanistic follow-up\",\n      \"pmids\": [\"25695151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"FoxO6 binds to DAF-16-binding elements in the Plexin A4 (Plxna4) promoter region, activates Plxna4 expression, and is required for correct radial neuronal migration in the developing neocortex; ectopic Plxna4 expression rescues migration defects in FoxO6-deficient models.\",\n      \"method\": \"FoxO6+/- and FoxO6-/- mice, siRNA knockdown, ChIP for FoxO6 binding to Plxna4 promoter, genome-wide transcriptomics, rescue by ectopic Plxna4 expression\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP, KO models, transcriptomics, and genetic rescue in two loss-of-function systems\",\n      \"pmids\": [\"27791111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FoxO6 activates Lats1 expression, thereby increasing Yap phosphorylation and activating Hippo signaling to control craniofacial growth; FoxO6-/- mice show reduced Lats1, decreased Hippo signaling, and expanded facial/skull growth; PITX2 activates FoxO6 expression upstream.\",\n      \"method\": \"FoxO6 knockout mice, in vitro reporter assays, in vivo cell proliferation analysis, craniofacial morphometry, MRI, in vitro Lats1 promoter and Hippo reporter assays\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mice with multiple phenotypes, in vitro functional assays establishing pathway\",\n      \"pmids\": [\"30286078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FOXO6 transcriptionally regulates Sirt6 expression in breast cancer cells, as shown by ChIP and luciferase reporter assays; FOXO6 suppresses EMT and acts as a tumor suppressor partly through this regulation.\",\n      \"method\": \"ChIP-qPCR, luciferase reporter assay, siRNA knockdown, invasion and migration assays\",\n      \"journal\": \"Cancer management and research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — ChIP and reporter assay establish direct transcriptional regulation, single lab\",\n      \"pmids\": [\"30464613\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"FoxO6 directly binds to and elevates IL-1β expression in hepatocytes; IL-1β in turn elevates PAR2 protein levels, decreasing hepatic insulin signaling (TF/PAR2 pathway); FoxO6-KO mice show reduced PAR2 signaling and decreased inflammatory cytokine expression.\",\n      \"method\": \"Virus-mediated FoxO6 activation/KO mice, siRNA knockdown in hepatocytes, IL-1β treatment, PAR2-siRNA, ChIP/binding assays implied by direct binding statement\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — in vivo KO and in vitro mechanistic dissection, single lab\",\n      \"pmids\": [\"30974318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"5-HT1D stabilizes PIK3R1 by inhibiting its ubiquitin-mediated degradation; the 5-HT1D/PIK3R1 interaction enhances FoxO6 expression through PI3K/Akt signaling; FoxO6 can also be directly transcriptionally activated by 5-HT1D in an Akt-independent manner.\",\n      \"method\": \"Co-IP for PIK3R1 interaction, ubiquitination assay, overexpression/knockdown, PI3K/Akt pathway inhibition, luciferase reporter assays\",\n      \"journal\": \"Hepatology (Baltimore, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — multiple functional assays, Co-IP, and reporter assays in HCC cells, single lab\",\n      \"pmids\": [\"30561038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FoxO6 transcription factor interacts with C/EBP homologous protein (CHOP), an ER stress-inducible transcription factor; this physical interaction between CHOP and FoxO6 drives PPARγ expression and promotes hepatic lipid accumulation during ER stress.\",\n      \"method\": \"Co-immunoprecipitation (FoxO6–CHOP interaction), constitutively active FoxO6 transgenic and FoxO6-KO mice, palmitate treatment of HepG2 cells, lipid staining\",\n      \"journal\": \"Liver international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP establishing physical interaction plus in vivo transgenic/KO models, single lab\",\n      \"pmids\": [\"32639626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FOXO6 interacts with METTL3 to trigger transcription of GPR161, which subsequently regulates β-defensin expression in response to ETEC K88 infection; m6A methylation via METTL3 controls GPR161-dependent defensin induction.\",\n      \"method\": \"MeRIP-seq, Co-IP (FOXO6–METTL3 interaction), METTL3 rescue experiments, GPR161 reporter analysis\",\n      \"journal\": \"RNA biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — Co-IP and MeRIP-seq with functional follow-up, single lab\",\n      \"pmids\": [\"32914682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FoxO6 activates antioxidant gene expression (MnSOD, catalase) and its knockdown markedly increases melanin content in melanocytes; FoxO6 phosphorylation by Akt is essential for this activity; adenoviral FoxO6 activation reduces melanogenesis in UVB-exposed cells by decreasing oxidative stress.\",\n      \"method\": \"siRNA knockdown, adenoviral overexpression, B16F10 cells, UVB exposure model, ROS/melanin measurements, PI3K/AKT inhibition\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — gain- and loss-of-function with defined pathway, single lab\",\n      \"pmids\": [\"32863230\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FoxO6 overexpression promotes preadipocyte cell-cycle arrest (G1 phase) and apoptosis; FoxO6 directly targets and induces expression of CCNG2 (cyclin G2) as confirmed by ChIP assay; FoxO6 also suppresses early adipogenic regulators PPARγ and C/EBPα.\",\n      \"method\": \"ChIP assay for CCNG2 promoter binding, overexpression/knockdown in preadipocytes, cell cycle analysis, Oil-Red-O staining\",\n      \"journal\": \"Life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP validates direct binding to target promoter, plus functional cellular assays\",\n      \"pmids\": [\"33290791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FOXO6 directly interacts with the USP7 gene promoter and enhances its transcriptional activity, suppressing cancer cell apoptosis; USP7 in turn enhances ubiquitination of JMJD3, leading to JMJD3-mediated transcriptional activation of CLU via H3K27me3 demethylation.\",\n      \"method\": \"ChIP-qPCR, luciferase reporter assay, immunoprecipitation, ubiquitination assays, in vivo xenograft with USP7/JMJD3 inhibitors\",\n      \"journal\": \"Molecular therapy oncolytics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and IP/ubiquitination assays establish mechanistic chain, single lab\",\n      \"pmids\": [\"33768140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FoxO6 phosphorylation by LPS leads to NF-κB activation via Akt and Pak1 pathways in the liver; LPS-induced FoxO6 phosphorylation and inactivation are Pak1-dependent in nuclear fractions, and Pak1 activation by LPS occurs in a PI3K-independent manner; Pak1 phosphorylation permits interaction between FoxO6 and Akt.\",\n      \"method\": \"Transfection with FoxO6-wt virus and FoxO6-siRNA in HepG2 cells, Pak1 pathway inhibition, nuclear fractionation, aged rat liver model\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — nuclear fractionation and pathway inhibition studies, single lab\",\n      \"pmids\": [\"26506521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FoxO6 directly binds to the RAD51 promoter and activates its expression, promoting DNA damage repair in nucleus pulposus cells; FoxO6 upregulation reduces γH2AX foci formation, indicating reduced DNA damage.\",\n      \"method\": \"ChIP assay, luciferase reporter assay, FoxO6 overexpression, γH2AX immunofluorescence, flow cytometry\",\n      \"journal\": \"European review for medical and pharmacological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and reporter assay confirm direct promoter binding, functional validation\",\n      \"pmids\": [\"34533813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PAR2 Akt-mediated phosphorylation of FoxO6 at Ser184 suppresses FoxO6 activity and contributes to ROS-mediated inflammation during skin photoaging; PAR2 knockdown suppresses Akt/NF-κB and increases FoxO6, while PAR2 overexpression decreases FoxO6.\",\n      \"method\": \"PAR2 KO mice, PAR2 antagonist (GB83), si-PAR2 knockdown and PAR2 overexpression in UVB-irradiated HaCaT cells, UVB-irradiated hairless mice, phospho-FoxO6 (Ser184) detection\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse, pharmacological inhibition, and cell-based gain/loss-of-function with defined phosphorylation site, multiple orthogonal approaches\",\n      \"pmids\": [\"34082382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"FoxO6 promotes pathological cardiac hypertrophy and dysfunction downstream of angiotensin-II by transcriptionally activating Kif15; Kif15 in turn elevates TGF-β1 secretion from cardiomyocytes, promoting fibroblast proliferation and differentiation.\",\n      \"method\": \"FoxO6 KO and overexpressing mice, Ang-II infusion model, Kif15 inhibition, in vitro cardiomyocyte/fibroblast co-culture experiments, cardiac function measurements\",\n      \"journal\": \"MedComm\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO and OE mice with defined downstream target and rescue experiment, single lab\",\n      \"pmids\": [\"37799807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"FOXO6 transcriptionally inhibits CTRP3 expression by binding to the CTRP3 promoter (JASPAR-predicted binding, validated by ChIP and luciferase reporter assay); FOXO6-mediated CTRP3 suppression promotes OGD/R-triggered cardiac microvascular endothelial barrier disruption via SIRT1/Nrf2 signaling.\",\n      \"method\": \"ChIP, luciferase reporter assay, co-transfection of CTRP3 and FOXO6 overexpression plasmids, OGD/R model, permeability assays\",\n      \"journal\": \"Folia morphologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — ChIP and luciferase confirm direct binding/repression; functional rescue experiments, single lab\",\n      \"pmids\": [\"36688407\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FoxO6 induces TXNIP expression in the liver; TXNIP acts as a key regulator upstream of the NLRP3 inflammasome, and FoxO6-driven TXNIP upregulation activates the NLRP3 inflammasome complex (including ASC and pro-caspase-1), leading to IL-1β production and lipid accumulation.\",\n      \"method\": \"Constitutively active FoxO6 transgenic and FoxO6-null mice, palmitate-treated HepG2 cells, inflammasome component western blot, TXNIP overexpression/knockdown\",\n      \"journal\": \"Endocrinology and metabolism (Seoul, Korea)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo transgenic/KO plus in vitro mechanistic dissection, single lab\",\n      \"pmids\": [\"38417829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FoxO6 transcriptionally activates ApoC3 expression in the liver, driving lipid accumulation, hepatic steatosis, hyperlipidemia, and hyperglycemia; high glucose upregulates FoxO6, which upregulates ApoC3 and gluconeogenic genes; FoxO6-KO mice show attenuated hepatic lipid accumulation.\",\n      \"method\": \"FoxO6 transgenic (FoxO6-Tg) and KO mice, aged rat HFD model, liver cell cultures, ApoC3 promoter and gene expression analysis\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple in vivo genetic models with defined downstream target, single lab\",\n      \"pmids\": [\"38441531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FoxO6 physically interacts with PPARγ, and this interaction promotes hepatic lipid accumulation; betaine inhibits the FoxO6–PPARγ interaction and suppresses lipogenic gene transcription. In a separate study, FoxO6 also interacts with PPARα to suppress β-oxidation, promoting hepatic steatosis.\",\n      \"method\": \"Co-immunoprecipitation (FoxO6–PPARγ and FoxO6–PPARα interactions), FoxO6 transgenic/KO mice, db/db mice with betaine treatment, HepG2 cells with high glucose and FoxO6 overexpression\",\n      \"journal\": \"Journal of medicinal food; Journal of molecular medicine (Berlin, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — Co-IP establishing physical interactions, supported by in vivo models, single lab\",\n      \"pmids\": [\"39263959\", \"39198274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FOXG1 upregulation in neural stem cells increases FoxO6 expression; FoxO6-null NSCs cannot efficiently exit quiescence following FOXG1 elevation; Pak1 expression is upregulated by FOXG1 and downregulated upon FOXO6 loss, suggesting FOXO6 acts downstream of FOXG1 to control quiescence exit partly via Pak1-regulated macropinocytosis.\",\n      \"method\": \"Foxo6 genetic knockout in NSCs, FOXG1 overexpression, cell cycle analysis, quiescence entry/exit assays, vacuole formation analysis, Pak1 expression measurement\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined functional phenotype and pathway placement, single lab\",\n      \"pmids\": [\"39499086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"METTL3-mediated m6A modification stabilizes FOXO6 mRNA; FOXO6 transcriptionally activates TXNIP by directly binding to its promoter, promoting mitochondrial dysfunction and apoptosis in granulosa cells; TXNIP knockdown reverses effects of FOXO6 overexpression, confirming the METTL3/FOXO6/TXNIP axis in PCOS pathology.\",\n      \"method\": \"mRNA sequencing, MeRIP-qPCR for m6A on FOXO6 mRNA, actinomycin D mRNA stability assay, luciferase reporter assay for TXNIP promoter, siRNA knockdown and overexpression, flow cytometry for apoptosis\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — m6A stability assay, ChIP/luciferase for direct binding, and functional rescue, single lab\",\n      \"pmids\": [\"41091548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"WNT10B signals through FOXO6 to mediate metabolic reprogramming from fatty acid oxidation to glycolysis in renal tubular cells; FOXO6 transcriptionally modulates PPARA and PKM to control this metabolic reprogramming and regulate tubular senescence fate transition; ChIP-seq, bulk and single-nucleus RNA-seq confirm FOXO6 as the transcriptional mediator of the WNT10B signal.\",\n      \"method\": \"Wnt10b KO and transgenic CKD mouse models, ChIP-seq, bulk RNA-seq, single-nucleus RNA-seq, ChIP-qPCR for PPARA and PKM promoters, FOXO6 overexpression/knockdown\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multi-omics (ChIP-seq, snRNA-seq) combined with in vivo genetic models establish FOXO6 as direct transcriptional mediator\",\n      \"pmids\": [\"41963348\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FOXO6 is a predominantly nuclear FoxO transcription factor that, unlike FoxO1/3/4, lacks the C-terminal PKB phosphorylation motif and therefore cannot undergo classical nucleo-cytoplasmic shuttling; instead, insulin/PI3K/Akt signaling phosphorylates FOXO6 at Thr26 and Ser184 to disable its DNA-binding and transcriptional activity in the nucleus. In the liver, active FOXO6 directly binds promoters of gluconeogenic genes (PEPCK, G6Pase), MTP, ApoC3, and TXNIP to promote glucose production, VLDL-TG secretion, and lipid accumulation, while forming physical complexes with CHOP and PPARγ (to drive lipogenesis) and suppressing PPARα (to inhibit β-oxidation); in the brain, FOXO6 regulates synaptic gene programs (including Plxna4) to support dendritic spine density and hippocampal memory consolidation; and in craniofacial tissues, FOXO6 activates Lats1 to engage Hippo signaling and restrict postnatal growth.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"FOXO6 is a forkhead box transcription factor that functions as a nuclear integrator of insulin/PI3K/Akt signaling across metabolic, neural, and developmental programs. Unlike other FoxO family members, FOXO6 lacks the C-terminal PKB phosphorylation motif required for classical nuclear export; instead, Akt-mediated phosphorylation at Thr26 and Ser184 disables its DNA-binding and transcriptional activity while it remains nuclear [PMID:12857750, PMID:15987244]. In the liver, FOXO6 directly activates gluconeogenic genes (PEPCK, G6Pase), lipid-regulatory targets (MTP, ApoC3, TXNIP), and inflammatory mediators (IL-1β), and physically interacts with PPARγ, PPARα, and CHOP to promote lipogenesis, suppress β-oxidation, and drive NLRP3 inflammasome activation, such that FOXO6 knockout attenuates diet-induced hepatic steatosis, hyperglycemia, and inflammation [PMID:21940782, PMID:24437489, PMID:25944898, PMID:38441531, PMID:32639626, PMID:39198274, PMID:38417829]. In the brain, FOXO6 regulates synaptic gene programs including Plxna4 to maintain dendritic spine density and hippocampal memory consolidation, and in craniofacial tissues it activates Lats1 to engage Hippo signaling and restrain postnatal growth [PMID:23222102, PMID:27791111, PMID:30286078].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Identification of FOXO6 as a novel FoxO family member resolved how the FoxO subfamily diversifies its nuclear-cytoplasmic regulation: FOXO6 lacks the C-terminal PKB phosphorylation site, making it predominantly nuclear even after growth factor stimulation.\",\n      \"evidence\": \"GFP-fusion transfection, chimeric protein analysis, PI3K/PKB pathway modulation, and subcellular localization imaging\",\n      \"pmids\": [\"12857750\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Post-translational regulation beyond PKB phosphorylation not yet explored\", \"Endogenous tissue expression pattern not characterized\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defining how insulin/PI3K/Akt controls FOXO6 without nuclear export established a novel regulatory paradigm: Thr26 phosphorylation acts as a growth factor sensor while Ser184 phosphorylation directly impairs DNA binding, together silencing FOXO6 transcriptional activity in situ.\",\n      \"evidence\": \"Site-directed mutagenesis of Thr26 and Ser184 combined with transcriptional reporter and DNA-binding assays\",\n      \"pmids\": [\"15987244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional kinases target these or other sites not tested\", \"Crystal structure of phosphorylated FOXO6 forkhead domain unavailable\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Linking FOXO6 to hepatic gluconeogenesis established its first in vivo metabolic function: gain-of-function augments glucose production and fasting blood glucose, while hepatic loss-of-function suppresses gluconeogenesis, confirming FOXO6 as a non-redundant gluconeogenic driver.\",\n      \"evidence\": \"Transgenic and knockout mouse models, adenoviral overexpression in liver, primary hepatocyte glucose production assays\",\n      \"pmids\": [\"21940782\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of FOXO6 versus FoxO1 to hepatic gluconeogenesis not quantitatively resolved\", \"Direct target gene ChIP evidence for PEPCK/G6Pase promoters not yet shown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrating that FOXO6 is required for hippocampal memory consolidation and dendritic spine density revealed a non-metabolic neuronal role, broadening the gene's functional scope to synaptic gene regulation.\",\n      \"evidence\": \"FoxO6 knockout mice tested in contextual fear conditioning and novel object recognition; dendritic spine analysis; genome-wide transcriptomics\",\n      \"pmids\": [\"23222102\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific synaptic target genes directly bound by FOXO6 not yet identified\", \"Whether memory defects are developmental or adult-onset not fully distinguished\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identification of MTP as a direct FOXO6 transcriptional target connected FOXO6 to hepatic VLDL-triglyceride secretion, extending its metabolic role beyond gluconeogenesis to lipoprotein metabolism.\",\n      \"evidence\": \"ChIP, promoter mutagenesis, transgenic/knockdown mice, VLDL-TG secretion assays in HepG2 cells and human primary hepatocytes\",\n      \"pmids\": [\"24437489\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether FOXO6 regulates other lipoprotein assembly genes not tested\", \"Contribution relative to FoxO1 on MTP promoter not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"FOXO6 knockout mice showed protection against diet-induced glucose intolerance and reduced hepatic/adipose macrophage infiltration, establishing FOXO6 as a link between insulin resistance and tissue inflammation.\",\n      \"evidence\": \"FoxO6-KO mice on high-fat diet, glucose tolerance tests, macrophage infiltration analysis, CCR2 expression measurement\",\n      \"pmids\": [\"25944898\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional regulation of CCR2 by FOXO6 not confirmed by ChIP\", \"Cell-autonomous versus systemic inflammatory effects not fully dissected\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identification of Plxna4 as a direct FOXO6 target gene resolved the molecular basis of FOXO6-dependent neuronal migration: FOXO6 binds DAF-16-binding elements in the Plxna4 promoter and ectopic Plxna4 rescues migration defects.\",\n      \"evidence\": \"FoxO6-KO mice, ChIP for Plxna4 promoter, genome-wide transcriptomics, genetic rescue with ectopic Plxna4\",\n      \"pmids\": [\"27791111\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Plxna4 also mediates the synaptic/memory phenotype not tested\", \"Other FOXO6 neuronal targets identified by transcriptomics await individual validation\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrating that FOXO6 activates Lats1 to engage Hippo-Yap signaling placed FOXO6 within a developmental growth-control circuit governing craniofacial morphogenesis, with PITX2 acting upstream.\",\n      \"evidence\": \"FoxO6-KO mice with craniofacial morphometry and MRI, Lats1 promoter reporter assays, Hippo reporter assays, cell proliferation analysis\",\n      \"pmids\": [\"30286078\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether FOXO6-Hippo axis operates in other tissues not explored\", \"Direct ChIP of FOXO6 on Lats1 promoter not shown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Multiple studies converged on FOXO6 as a hepatic lipogenic driver: physical interaction with CHOP promotes PPARγ expression during ER stress, and FOXO6 directly interacts with PPARγ and PPARα to promote lipogenesis and suppress β-oxidation, respectively.\",\n      \"evidence\": \"Co-immunoprecipitation of FOXO6–CHOP and FOXO6–PPARγ/PPARα complexes; FoxO6 transgenic/KO mice; palmitate-treated HepG2 cells\",\n      \"pmids\": [\"32639626\", \"39263959\", \"39198274\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of FOXO6–CHOP and FOXO6–PPAR interactions unknown\", \"Whether these interactions are direct or bridged by co-factors not resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"FOXO6 was shown to drive hepatic steatosis through transcriptional activation of ApoC3 and TXNIP, linking FOXO6 to NLRP3 inflammasome activation and lipid accumulation via distinct downstream effectors.\",\n      \"evidence\": \"FoxO6-Tg and KO mice, HepG2 cells, TXNIP overexpression/knockdown, inflammasome component analysis, ApoC3 gene expression in HFD and aged models\",\n      \"pmids\": [\"38417829\", \"38441531\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ChIP of FOXO6 on ApoC3 promoter not yet published\", \"Relative contribution of TXNIP versus other FOXO6 targets to inflammasome activation unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"The METTL3/m6A–FOXO6–TXNIP axis was defined in granulosa cells, revealing post-transcriptional regulation of FOXO6 mRNA stability and establishing FOXO6–TXNIP as a conserved transcriptional module across liver and ovary.\",\n      \"evidence\": \"MeRIP-qPCR for m6A on FOXO6 mRNA, actinomycin D mRNA stability assay, luciferase reporter for TXNIP promoter, siRNA rescue in granulosa cells\",\n      \"pmids\": [\"41091548\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether m6A-mediated FOXO6 stabilization operates in hepatocytes not tested\", \"YTHDF reader identity for FOXO6 mRNA not identified\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Multi-omics integration established FOXO6 as the transcriptional mediator of WNT10B-driven metabolic reprogramming in renal tubular cells, directly modulating PPARA and PKM to shift metabolism from fatty acid oxidation to glycolysis and regulate tubular senescence.\",\n      \"evidence\": \"Wnt10b KO and transgenic CKD mouse models, ChIP-seq, bulk and single-nucleus RNA-seq, ChIP-qPCR for PPARA and PKM promoters\",\n      \"pmids\": [\"41963348\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether FOXO6-mediated metabolic reprogramming operates in non-renal epithelia not tested\", \"Upstream mechanism linking WNT10B to FOXO6 activation not fully resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Structural characterization of FOXO6 (especially phosphorylated forkhead domain), genome-wide direct target identification across tissues by ChIP-seq, and the relative non-redundant contribution of FOXO6 versus other FoxO members in hepatic and neural contexts remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure of FOXO6\", \"Comprehensive ChIP-seq across metabolic tissues not performed\", \"Functional redundancy with FoxO1/FoxO3 not systematically tested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 6, 10, 21, 24, 29, 30]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 2, 6, 10, 11, 18, 19, 26, 29, 30]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1, 20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0162582\", \"supporting_discovery_ids\": [0, 1, 2, 22]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 2, 22]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [2, 6, 7, 26, 27, 30]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 6, 10, 11, 19, 26, 29, 30]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [10, 11]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CHOP\",\n      \"PPARG\",\n      \"PPARA\",\n      \"METTL3\",\n      \"HNF4A\",\n      \"AKT1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}