{"gene":"GLI1","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2014,"finding":"GLI1 binds DNA through its zinc finger domain, and Glabrescione B was identified as the first small molecule that binds to the GLI1 zinc finger domain and impairs GLI1 transcriptional activity by interfering with its interaction with DNA, inhibiting Hedgehog-dependent tumor cell growth and stem cell self-renewal in vitro and in vivo.","method":"Structural analysis of GLI1 zinc finger/DNA interaction, small molecule binding assay, Gli-luciferase reporter assay, in vitro and in vivo tumor growth assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — structural requirements defined, direct DNA-binding assay with mutagenesis/compound interference, validated in vitro and in vivo in single rigorous study","pmids":["25476449"],"is_preprint":false},{"year":2017,"finding":"The deubiquitinase USP48 directly interacts with GLI1 and cleaves ubiquitin from GLI1, thereby stabilizing GLI1 protein and activating Gli-dependent transcription. In turn, GLI1 transcriptionally activates USP48, forming a positive feedback loop to sustain Hedgehog signaling.","method":"Co-immunoprecipitation, deubiquitinase activity assay, Gli-luciferase reporter, siRNA knockdown, glioblastoma cell proliferation and tumorigenesis assays, chromatin immunoprecipitation","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct deubiquitinase activity shown, reciprocal interaction established, multiple orthogonal methods in single study","pmids":["28623188"],"is_preprint":false},{"year":2022,"finding":"ERK2 MAP kinase phosphorylates GLI1 on three evolutionarily conserved sites (S102, S116, S130) near the SUFU binding region, and multisite phosphorylation cooperatively weakens GLI1-SUFU binding affinity by over 25-fold, facilitating GLI1 nuclear transcriptional activity.","method":"In vitro kinase assay, site-directed mutagenesis, binding affinity measurements, Gli-luciferase reporter in mammalian cells, phosphomimetic substitution experiments","journal":"Life science alliance","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with mutagenesis, quantified binding affinity changes, cellular transcriptional readout, multiple orthogonal methods","pmids":["35831023"],"is_preprint":false},{"year":2018,"finding":"MEKK2 (MAP3K2) and MEKK3 (MAP3K3) phosphorylate GLI1 on multiple Ser/Thr sites, reducing GLI1 protein stability, DNA-binding ability, and increasing GLI1 association with SUFU, thereby inhibiting GLI1 transcriptional activity. MEKK2/3 mediate FGF2-induced inhibition of Hedgehog signaling.","method":"Co-immunoprecipitation, in vitro kinase assay, Gli-luciferase reporter, site-directed mutagenesis, medulloblastoma cell proliferation assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay, co-IP, DNA binding assay, and functional reporter assay, multiple orthogonal methods in single study","pmids":["29662197"],"is_preprint":false},{"year":2019,"finding":"Polo-like kinase 1 (Plk1) phosphorylates GLI1 at S481, promoting nuclear export of GLI1 and increasing its association with the negative regulator SUFU, thereby reducing Hedgehog signaling activity. GLI1 expression peaks during G1/S phases and is suppressed by Plk1 during other cell cycle phases.","method":"In vitro kinase assay, site-directed mutagenesis, co-immunoprecipitation, subcellular fractionation/nuclear export assay, Gli-luciferase reporter","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct phosphorylation shown in vitro with mutagenesis, SUFU binding and nuclear export demonstrated with multiple orthogonal methods","pmids":["30578313"],"is_preprint":false},{"year":2008,"finding":"Protein kinase Cδ (PKCδ) negatively regulates GLI1 transcriptional activity downstream of Smoothened; activated PKCδ decreases Gli-luciferase reporter activity and endogenous GLI1 and PTCH1 expression, while PKCδ siRNA increases these targets.","method":"Gli-luciferase reporter assay, siRNA knockdown, western blot, epistasis experiment (cyclopamine rescue with PKCδ siRNA)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis established (PKCδ acts downstream of Smo), reporter and endogenous gene assays, single lab with multiple methods","pmids":["19015273"],"is_preprint":false},{"year":2006,"finding":"In the absence of Hedgehog, sequential phosphorylation of Gli by PKA, GSK3, and CKI creates docking sites for the SCF(Slimb/β-TRCP) E3 ubiquitin ligase, promoting Gli ubiquitination and proteasome-mediated proteolytic processing to a truncated transcriptional repressor form.","method":"Biochemical phosphorylation assays, ubiquitination assays, proteasome inhibition experiments in Drosophila and mammalian cells","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical reconstitution of phosphorylation cascade and ubiquitination reviewed from multiple independent studies, but this paper is a review compiling others' data","pmids":["17102630"],"is_preprint":false},{"year":2015,"finding":"Stabilized β-catenin physically interacts with GLI1 protein, leading to GLI1 sequestration, reduced GLI1 transcriptional activity, and GLI1 degradation, resulting in suppression of Hedgehog signaling, reduced medulloblastoma cell proliferation, G2/M arrest, and promotion of a senescent-like state.","method":"Co-immunoprecipitation, proximity ligation assay, Gli-luciferase reporter, cell cycle analysis, medulloblastoma sphere assays, in vivo tumor transplantation","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct physical interaction confirmed by two orthogonal methods (Co-IP and PLA), functional consequences demonstrated in vitro and in vivo, single lab","pmids":["25645196"],"is_preprint":false},{"year":2017,"finding":"ADAR1-mediated Alu-dependent adenosine-to-inosine RNA editing of GLI1 enhances GLI1 transcriptional activity and promotes Hedgehog pathway activation; wild-type but not catalytically mutant ADAR1 drives this editing and increases GLI1-mediated transcription, promoting immunomodulatory drug resistance in multiple myeloma.","method":"RNA editing analysis, ADAR1 wild-type vs. mutant expression, GLI1 transcriptional reporter assay, siRNA knockdown, patient-derived xenograft transplantation","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic dissection using catalytic mutant ADAR1, RNA editing confirmed, transcriptional activity measured, in vivo xenograft validation","pmids":["29203771"],"is_preprint":false},{"year":2014,"finding":"Arhgap36 activates GLI transcription factors in a Smoothened-independent manner by inhibiting Gli repressor formation, promoting accumulation of full-length Gli proteins in the primary cilium, and functionally interacting with Suppressor of Fused (SUFU). Arhgap36-induced Gli activation requires KIF3A and IFT88, indicating ciliogenesis is required.","method":"Genome-scale cDNA overexpression screen, Gli-luciferase reporter, co-immunoprecipitation with SUFU, cilia accumulation imaging, genetic epistasis with KIF3A/IFT88 knockdown, transcriptional profiling","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional screen identified mechanism, biochemical interaction with SUFU shown, genetic epistasis with cilia components, single lab multiple methods","pmids":["25024229"],"is_preprint":false},{"year":2011,"finding":"GLI1 directly regulates DNMT1 gene expression in pancreatic cancer; ChIP assay showed GLI1 protein binds to the DNMT1 promoter. GLI1 also regulates DNMT3a expression, though not through direct promoter binding. GLI1-mediated regulation of DNMT1 affects APC gene methylation.","method":"ChIP assay, siRNA knockdown, lentiviral overexpression, qRT-PCR, western blot, methylation-specific PCR","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding demonstrated by ChIP, functional regulation confirmed by knockdown and overexpression with multiple methods, single lab","pmids":["22110720"],"is_preprint":false},{"year":2019,"finding":"ULK3 (unc-51 like kinase 3) activates GLI1, and ULK3-dependent GLI1 activation contributes to transcriptional upregulation of DNMT3A gene expression upon autophagy induction; proximity ligation assay and ChIP confirmed GLI1 activity at the DNMT3A promoter.","method":"Proximity ligation assay, ChIP, shRNA knockdown, qRT-PCR, Gli-luciferase reporter","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct GLI1 occupancy at DNMT3A promoter shown by ChIP, ULK3-GLI1 interaction by PLA, functional validation by knockdown","pmids":["35226587"],"is_preprint":false},{"year":2020,"finding":"PRMT1 methylates GLI1 to upregulate its transcriptional activity and target gene expression; cytoplasmic PRMT5 methylates GLI1 and promotes GLI1 protein stabilization. Nuclear PRMT5 indirectly downregulates GLI1 activity via MENIN-mediated suppression of GAS1 expression.","method":"In vitro methylation assay, co-immunoprecipitation, Gli-luciferase reporter, protein stability assays (reviewed from multiple studies)","journal":"Cells","confidence":"Low","confidence_rationale":"Tier 3 / Weak — findings are compiled from multiple sources in a review-like paper; primary mechanistic data not directly presented in this abstract","pmids":["32859041"],"is_preprint":false},{"year":2016,"finding":"GLI1 and Gli2 directly bind to promoter regions of the NEK2A gene and induce its transcription, as demonstrated by chromatin immunoprecipitation; Nek2A in turn stabilizes SUFU and negatively regulates Hedgehog target genes, forming a negative feedback loop.","method":"Chromatin immunoprecipitation, Gli-luciferase reporter, protein stability assay, mRNA/protein expression analysis","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding confirmed by ChIP, functional feedback loop demonstrated with multiple assays, single lab","pmids":["28035348"],"is_preprint":false},{"year":2019,"finding":"GLI1 and GLI2 bind Gli binding sites (GBS) within the first intron of the human GLI1 gene in vitro, and elimination of key GBS attenuates transcriptional activation, demonstrating that GLI1 auto-regulates its own expression through a positive feedback loop. GLI1 also binds the histone variant H2A.Z.","method":"Electrophoretic mobility shift assay (in vitro DNA binding), transcriptional reporter assays with GBS mutants, ChIP for histone marks and BRD4, co-immunoprecipitation of GLI1 with H2A.Z","journal":"DNA repair","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro DNA binding with mutagenesis, transcriptional reporter with deletion constructs, multiple orthogonal methods in single lab","pmids":["31085420"],"is_preprint":false},{"year":2019,"finding":"In hypoxic colorectal cancer cells, CCT2 (T-complex protein 1 subunit beta) interacts with GLI1 and promotes proper folding of GLI1, protecting it from ubiquitination-mediated degradation by β-TrCP; CCT2 knockdown inhibits GLI1-driven tumor growth.","method":"Mass spectrometry interaction screen, co-immunoprecipitation, ubiquitination assay, siRNA knockdown, in vivo xenograft model","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS-identified interaction confirmed by co-IP, ubiquitination mechanism shown, functional consequence demonstrated in vivo, single lab","pmids":["31462707"],"is_preprint":false},{"year":2020,"finding":"GLI1 physically interacts with YAP1 in esophageal squamous cell carcinoma cells, as demonstrated by co-immunoprecipitation; GLI1 upregulates YAP1 in a LATS1-independent manner, while YAP1 induces GLI1 expression via PI3K/AKT signaling, and their interaction promotes tumor growth in vitro and in vivo.","method":"Co-immunoprecipitation, siRNA knockdown, western blot, in vitro and in vivo tumor growth assays","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — direct protein-protein interaction shown by co-IP, pathway cross-talk confirmed by knockdown experiments, in vivo validation, single lab","pmids":["31957872"],"is_preprint":false},{"year":2022,"finding":"STAT3 directly induces GLI1 gene expression in myelofibrosis fibrocytes; chromatin immunoprecipitation and luciferase assay showed STAT3 binds the GLI1 promoter and activates transcription. GLI1 in turn activates MMP2, MMP9, and procollagen-I expression, contributing to bone marrow fibrosis.","method":"Chromatin immunoprecipitation, luciferase reporter assay, siRNA knockdown, western blot, immunofluorescence","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct STAT3 binding to GLI1 promoter shown by ChIP and confirmed by luciferase reporter, downstream GLI1 targets identified, single lab multiple methods","pmids":["35595725"],"is_preprint":false},{"year":2004,"finding":"Gli proteins bind to a Gli-binding site in the promoter of the basonuclin gene and transcriptionally activate basonuclin expression, linking Hedgehog-Gli pathway activation to enhanced rRNA transcription in basal cell carcinoma.","method":"Gli-luciferase reporter with promoter deletion/mutation, electrophoretic mobility shift assay, in vivo BCC tissue analysis","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — direct promoter binding by EMSA with required binding site, transcriptional activation confirmed by reporter with mutagenesis, single lab","pmids":["15313903"],"is_preprint":false},{"year":2018,"finding":"Trichostatin A (a histone deacetylase inhibitor) promotes proteasome-dependent GLI1 protein degradation in multiple myeloma cells and inhibits nuclear accumulation of GLI1; p21 induction also contributes to GLI1 downregulation at the transcriptional level.","method":"Immunofluorescence for GLI1 nuclear localization, immunoprecipitation for ubiquitination, western blot, qPCR, proteasome inhibitor rescue experiment","journal":"Cancer management and research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — proteasome-dependent degradation shown by rescue experiment, nuclear localization by IF, but mechanism linking HDAC inhibition to GLI1 ubiquitination not fully established in this abstract","pmids":["30214285"],"is_preprint":false},{"year":2016,"finding":"In the MALAT1-GLI1 fusion identified in plexiform fibromyxoma, the truncated GLI1 protein retains its capacity to transcriptionally activate target genes, demonstrated by PCR/sequencing validation of fusion transcript and GLI1 protein overexpression with retained transcriptional activity.","method":"PCR on genomic DNA, Sanger sequencing, FISH, immunohistochemistry, transcriptional activation assay","journal":"The Journal of pathology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — fusion protein transcriptional activity inferred from target gene expression, not directly tested by reporter assay with isolated fusion construct in this abstract","pmids":["27101025"],"is_preprint":false},{"year":2010,"finding":"Genetic deletion of Gli1 in mice reveals that Gli1 regulates hematopoietic stem cell quiescence and myeloid progenitor proliferation; Gli1-null mice show increased quiescent long-term HSCs with enhanced engraftment, decreased myeloid colony formation, impaired G-CSF response, and reduced Cyclin D1 levels in progenitor cells.","method":"Gli1 homozygous knockout mouse, HSC/progenitor functional assays, transplantation/engraftment, colony formation assay, western blot for Cyclin D1","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic knockout with multiple defined phenotypic readouts and molecular endpoint (Cyclin D1), single lab","pmids":["20107231"],"is_preprint":false},{"year":2021,"finding":"Gli1 marks peripheral nerve perineurial glia, endoneurial fibroblasts, and pericytes by genetic fate mapping; Gli1 null mice show normal perineurium but form endoneurial minifascicles, demonstrating that Gli1 functions specifically in endoneurial fibroblasts to maintain normal peripheral nerve architecture. Gli1 expression in endoneurial fibroblasts is independent of Hedgehog/Dhh signaling (noncanonical).","method":"Genetic fate mapping (Gli1-Cre lineage tracing), Gli1 conditional and constitutive knockout, histological and ultrastructural analysis of peripheral nerves, Dhh null comparison","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic loss-of-function with specific phenotypic readout and pathway independence established by Dhh null comparison, single lab","pmids":["34772739"],"is_preprint":false},{"year":2020,"finding":"RAB23 acts as an upstream negative regulator of canonical Hh-GLI1 signaling and also non-canonically regulates GLI1 through pERK1/2; in Rab23-deficient mice, both canonical HH signaling and FGF10-driven pERK1/2 are elevated, leading to elevated GLI1 expression and aberrant osteoprogenitor proliferation causing craniosynostosis.","method":"Rab23 knockout mouse, western blot for GLI1/pERK1/2, pharmacological ERK inhibition with normalization of GLI1, histological analysis, genetic epistasis","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with pharmacological rescue establishing pathway position, multiple signaling endpoints measured, single lab","pmids":["32662771"],"is_preprint":false}],"current_model":"GLI1 is a zinc-finger transcription factor and terminal effector of the Hedgehog pathway that binds DNA through its zinc finger domain to activate target gene transcription; its activity is regulated by a complex network of post-translational modifications including phosphorylation by PKA/GSK3/CK1 (promoting proteasomal processing to a repressor), phosphorylation by ERK2 at S102/S116/S130 (weakening SUFU binding to activate GLI1), phosphorylation by Plk1 at S481 (promoting nuclear export and SUFU binding to inhibit GLI1), and phosphorylation by MEKK2/3 (reducing stability and DNA-binding); stabilization is achieved by the deubiquitinase USP48 which removes ubiquitin from GLI1; GLI1 is also regulated by arginine methylation by PRMT1/5, RNA editing by ADAR1, physical sequestration by β-catenin, and non-canonical activation through STAT3, RAS/ERK, PI3K/AKT, ULK3, and Arhgap36 pathways, with nuclear localization controlled by a bipartite NLS in its zinc-finger domain."},"narrative":{"mechanistic_narrative":"GLI1 is a zinc-finger transcription factor and terminal effector of the Hedgehog pathway that binds DNA through its zinc-finger domain to activate target gene transcription, and disrupting this DNA contact with the small molecule Glabrescione B suppresses Hedgehog-dependent tumor growth and stem cell self-renewal [PMID:25476449]. GLI1 autoregulates its own expression through Gli-binding sites in its first intron and engages the histone variant H2A.Z at chromatin, establishing a positive transcriptional feedback loop [PMID:31085420], and directly activates a broad target program including DNMT1/DNMT3a [PMID:22110720], DNMT3A upon autophagy induction [PMID:35226587], NEK2A [PMID:28035348], basonuclin [PMID:15313903], and MMP2/MMP9/procollagen-I [PMID:35595725]. GLI1 activity is gated by an extensive kinase network: ERK2 phosphorylation at S102/S116/S130 cooperatively weakens GLI1–SUFU binding to license nuclear transcriptional activity [PMID:35831023], whereas MEKK2/3 phosphorylation reduces GLI1 stability and DNA binding while enhancing SUFU association downstream of FGF2 [PMID:29662197], and Plk1 phosphorylation at S481 drives nuclear export and SUFU binding in a cell-cycle-dependent manner [PMID:30578313]. Protein-level stability is set opposingly by the deubiquitinase USP48, which removes ubiquitin from GLI1 in a reciprocal positive feedback loop [PMID:28623188], and the chaperonin subunit CCT2, which folds GLI1 and shields it from β-TrCP-mediated degradation [PMID:31462707]. GLI1 is further regulated by physical sequestration by β-catenin [PMID:25645196], ADAR1-mediated A-to-I RNA editing that enhances its activity [PMID:29203771], and non-canonical inputs from STAT3 [PMID:35595725], YAP1/PI3K-AKT [PMID:31957872], ULK3 [PMID:35226587], and Arhgap36 [PMID:25024229]. Genetically, Gli1 regulates hematopoietic stem cell quiescence and myeloid progenitor proliferation [PMID:20107231] and maintains peripheral nerve architecture through endoneurial fibroblasts independently of Hedgehog signaling [PMID:34772739].","teleology":[{"year":2004,"claim":"Establishing that GLI1 acts as a direct sequence-specific transcriptional activator required showing it binds a defined promoter element and drives target expression in a disease context.","evidence":"Gli-luciferase reporter with promoter mutagenesis and EMSA on the basonuclin promoter in basal cell carcinoma","pmids":["15313903"],"confidence":"Medium","gaps":["Limited to one target gene","Did not address GLI1 post-translational regulation"]},{"year":2006,"claim":"Defining how GLI is switched off in the absence of Hedgehog clarified the kinase cascade converting full-length GLI to a repressor form.","evidence":"Biochemical phosphorylation and ubiquitination assays compiling PKA/GSK3/CKI-primed SCF(Slimb/β-TRCP) processing in Drosophila and mammalian cells (review)","pmids":["17102630"],"confidence":"Medium","gaps":["Review compiling others' data","Focus on repressor processing, not GLI1 activation"]},{"year":2008,"claim":"Identifying negative regulators downstream of Smoothened placed PKCδ in the pathway as a suppressor of GLI1 output.","evidence":"Gli-luciferase reporter, siRNA knockdown, and cyclopamine epistasis in mammalian cells","pmids":["19015273"],"confidence":"Medium","gaps":["No direct GLI1 phosphorylation site mapped","Mechanism of GLI1 inhibition not defined"]},{"year":2010,"claim":"Genetic deletion revealed an organismal role for Gli1 in regulating hematopoietic stem cell quiescence and myeloid proliferation.","evidence":"Gli1 homozygous knockout mouse with HSC/progenitor functional, transplantation, and Cyclin D1 assays","pmids":["20107231"],"confidence":"Medium","gaps":["Direct GLI1 target genes in HSCs not defined","Did not separate canonical vs non-canonical contributions"]},{"year":2011,"claim":"Linking GLI1 to epigenetic machinery showed it directly controls DNA methyltransferase expression and downstream gene methylation.","evidence":"ChIP at the DNMT1 promoter, knockdown/overexpression, and methylation-specific PCR in pancreatic cancer","pmids":["22110720"],"confidence":"Medium","gaps":["DNMT3a regulation is indirect","Genome-wide methylation consequences not mapped"]},{"year":2014,"claim":"Demonstrating that the zinc-finger/DNA interface is druggable established GLI1's DNA-binding domain as the functional and therapeutic core.","evidence":"Structural analysis, small-molecule (Glabrescione B) binding/interference assay, Gli-luciferase reporter, and in vitro/in vivo tumor assays","pmids":["25476449"],"confidence":"High","gaps":["No high-resolution GLI1–DNA co-structure reported here","Effect on non-canonical GLI1 activation not addressed"]},{"year":2014,"claim":"A non-canonical, Smoothened-independent activator (Arhgap36) was identified that promotes full-length GLI accumulation via the cilium and SUFU interaction.","evidence":"Genome-scale cDNA overexpression screen, co-IP with SUFU, cilia imaging, and KIF3A/IFT88 epistasis","pmids":["25024229"],"confidence":"Medium","gaps":["Direct vs indirect SUFU modulation unclear","Physiological contexts of Arhgap36-GLI1 axis not defined"]},{"year":2015,"claim":"Cross-talk with Wnt was established by showing β-catenin physically sequesters and destabilizes GLI1 to suppress Hedgehog output.","evidence":"Co-IP, proximity ligation assay, Gli-luciferase reporter, cell-cycle analysis, and in vivo medulloblastoma transplantation","pmids":["25645196"],"confidence":"Medium","gaps":["Interaction interface not mapped","Single lab without reciprocal genetic validation"]},{"year":2016,"claim":"GLI1 was shown to nucleate a negative feedback loop by directly transactivating NEK2A, which stabilizes the inhibitor SUFU.","evidence":"ChIP at the NEK2A promoter, reporter assay, and SUFU stability measurements","pmids":["28035348"],"confidence":"Medium","gaps":["Kinetics of feedback not quantified","Generalizability across tissues untested"]},{"year":2017,"claim":"Opposing the repressor-processing pathway, USP48 was identified as a deubiquitinase that directly stabilizes GLI1, forming a positive feedback loop sustaining Hedgehog signaling.","evidence":"Co-IP, deubiquitinase activity assay, ChIP, reporter, and glioblastoma tumorigenesis assays","pmids":["28623188"],"confidence":"High","gaps":["Ubiquitin chain linkage specificity not defined","Site of deubiquitination on GLI1 unmapped"]},{"year":2017,"claim":"An RNA-level regulatory layer was uncovered: ADAR1-mediated A-to-I editing of GLI1 enhances its transcriptional activity and drives drug resistance.","evidence":"RNA editing analysis, catalytic-mutant ADAR1 comparison, reporter assay, and patient-derived xenografts in multiple myeloma","pmids":["29203771"],"confidence":"Medium","gaps":["Edited residue effect on GLI1 protein not mechanistically dissected","Editing prevalence across tissues unknown"]},{"year":2018,"claim":"MEKK2/3 were defined as inhibitory kinases that destabilize GLI1, reduce its DNA binding, and enhance SUFU association downstream of FGF2.","evidence":"In vitro kinase assay, co-IP, DNA-binding assay, reporter, and medulloblastoma proliferation assays","pmids":["29662197"],"confidence":"High","gaps":["Exact phosphosites only partially mapped","In vivo relevance of FGF2-MEKK axis not tested"]},{"year":2019,"claim":"Plk1 was shown to impose cell-cycle control on GLI1 by phosphorylating S481 to drive nuclear export and SUFU binding.","evidence":"In vitro kinase assay, mutagenesis, subcellular fractionation, co-IP, and reporter assay","pmids":["30578313"],"confidence":"High","gaps":["Nuclear export machinery for GLI1 not identified","Consequences for cell-cycle-coupled target gene timing not detailed"]},{"year":2019,"claim":"GLI1 was shown to autoregulate via intronic Gli-binding sites and engage H2A.Z chromatin, defining a self-amplifying transcriptional loop.","evidence":"EMSA with GBS mutants, reporter assays with deletion constructs, ChIP for histone marks/BRD4, and co-IP with H2A.Z","pmids":["31085420"],"confidence":"Medium","gaps":["Functional consequence of H2A.Z interaction unresolved","Quantitative contribution of autoregulation in vivo unclear"]},{"year":2019,"claim":"A chaperonin requirement was established: CCT2 folds GLI1 and protects it from β-TrCP-mediated degradation under hypoxia.","evidence":"Mass spectrometry interaction screen, co-IP, ubiquitination assay, knockdown, and xenograft model","pmids":["31462707"],"confidence":"Medium","gaps":["GLI1 folding intermediates not characterized","Hypoxia-specificity mechanism not defined"]},{"year":2019,"claim":"ULK3 was connected to autophagy-driven GLI1 activation at the DNMT3A promoter, extending GLI1 into autophagy signaling.","evidence":"Proximity ligation assay, ChIP at DNMT3A promoter, shRNA knockdown, and reporter assay","pmids":["35226587"],"confidence":"Medium","gaps":["Direct ULK3 phosphorylation of GLI1 not demonstrated","Physiological autophagy contexts not broadly tested"]},{"year":2020,"claim":"ERK2-equivalent and cross-pathway inputs were clarified, with YAP1/PI3K-AKT cross-talk shown to reciprocally amplify GLI1 in esophageal carcinoma.","evidence":"Co-IP, knockdown, and in vitro/in vivo tumor growth assays","pmids":["31957872"],"confidence":"Medium","gaps":["GLI1-YAP1 interaction interface unmapped","Direct vs indirect transcriptional cooperation unresolved"]},{"year":2020,"claim":"PRMT-mediated arginine methylation was reported as a modulator of GLI1 activity and stability with context-dependent direction.","evidence":"In vitro methylation, co-IP, reporter, and stability assays compiled in a review-like paper","pmids":["32859041"],"confidence":"Low","gaps":["Findings compiled from multiple sources, not primary data here","Methylation sites and direction of effect not directly demonstrated"]},{"year":2020,"claim":"RAB23 was positioned as an upstream negative regulator acting both canonically and via pERK1/2 to restrain GLI1 in osteoprogenitors.","evidence":"Rab23 knockout mouse, western blot for GLI1/pERK1/2, pharmacological ERK inhibition rescue, and histology","pmids":["32662771"],"confidence":"Medium","gaps":["Direct RAB23 mechanism on GLI1 not shown","Separation of canonical vs ERK contributions incomplete"]},{"year":2021,"claim":"Lineage tracing and knockout revealed a Hedgehog-independent role for Gli1 in endoneurial fibroblasts maintaining peripheral nerve architecture.","evidence":"Gli1-Cre fate mapping, conditional/constitutive knockout, ultrastructural nerve analysis, and Dhh-null comparison","pmids":["34772739"],"confidence":"Medium","gaps":["Driver of Hedgehog-independent Gli1 expression unknown","Target genes in endoneurial fibroblasts not identified"]},{"year":2022,"claim":"ERK2 was defined as a direct activating kinase that phosphorylates S102/S116/S130 to cooperatively release GLI1 from SUFU.","evidence":"In vitro kinase assay, mutagenesis, quantitative binding affinity, and phosphomimetic reporter experiments","pmids":["35831023"],"confidence":"High","gaps":["Upstream ERK-activating signals into GLI1 not fully traced","In vivo relevance of the >25-fold affinity shift untested"]},{"year":2022,"claim":"STAT3 was identified as a direct transcriptional inducer of GLI1, with GLI1 driving fibrotic gene expression in myelofibrosis.","evidence":"ChIP at the GLI1 promoter, luciferase reporter, knockdown, and immunofluorescence in fibrocytes","pmids":["35595725"],"confidence":"Medium","gaps":["STAT3-GLI1 axis specificity across tissues unclear","Whether STAT3 also modulates GLI1 protein activity not addressed"]},{"year":null,"claim":"How the many opposing post-translational, RNA-editing, and cross-pathway inputs are integrated to set net GLI1 transcriptional output in a given cellular context remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model reconciling activating (ERK2, USP48, CCT2) and inhibitory (Plk1, MEKK2/3, β-catenin) inputs","Lack of high-resolution GLI1-DNA structure","Mechanism of Hedgehog-independent GLI1 expression undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,14,18]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,10,13,14,17,18]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[4,19]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[9]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,2,3,4]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[10,13,14,17,18]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,1,7,8,16,17]}],"complexes":[],"partners":["SUFU","USP48","CCT2","CTNNB1","YAP1","H2AFZ"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P08151","full_name":"Zinc finger protein GLI1","aliases":["Glioma-associated oncogene","Oncogene GLI"],"length_aa":1106,"mass_kda":117.9,"function":"Acts as a transcriptional activator (PubMed:10806483, PubMed:19706761, PubMed:19878745, PubMed:24076122, PubMed:24217340, PubMed:24311597). Binds to the DNA consensus sequence 5'-GACCACCCA-3' (PubMed:2105456, PubMed:24217340, PubMed:8378770). Regulates the transcription of specific genes during normal development (PubMed:19706761). Plays a role in craniofacial development and digital development, as well as development of the central nervous system and gastrointestinal tract. Mediates SHH signaling (PubMed:19706761, PubMed:28973407). Plays a role in cell proliferation and differentiation via its role in SHH signaling (PubMed:11238441, PubMed:28973407) Acts as a transcriptional activator, but activates a different set of genes than isoform 1. Activates expression of CD24, unlike isoform 1. Mediates SHH signaling. 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fibrocytes.","date":"2022","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/35595725","citation_count":18,"is_preprint":false},{"pmid":"28035348","id":"PMC_28035348","title":"Nek2A/SuFu feedback loop regulates Gli-mediated Hedgehog signaling pathway.","date":"2016","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/28035348","citation_count":18,"is_preprint":false},{"pmid":"37914731","id":"PMC_37914731","title":"Gli1 marks a sentinel muscle stem cell population for muscle regeneration.","date":"2023","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/37914731","citation_count":17,"is_preprint":false},{"pmid":"35831023","id":"PMC_35831023","title":"ERK2 MAP kinase regulates SUFU binding by multisite phosphorylation of GLI1.","date":"2022","source":"Life science 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in Ovarian Cancer.","date":"2019","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/30736319","citation_count":14,"is_preprint":false},{"pmid":"31957872","id":"PMC_31957872","title":"Gli1 interacts with YAP1 to promote tumorigenesis in esophageal squamous cell carcinoma.","date":"2020","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/31957872","citation_count":14,"is_preprint":false},{"pmid":"34837604","id":"PMC_34837604","title":"Advances in glioma-associated oncogene (GLI) inhibitors for cancer therapy.","date":"2021","source":"Investigational new drugs","url":"https://pubmed.ncbi.nlm.nih.gov/34837604","citation_count":13,"is_preprint":false},{"pmid":"34772739","id":"PMC_34772739","title":"Gli1 Regulates the Postnatal Acquisition of Peripheral Nerve Architecture.","date":"2021","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/34772739","citation_count":13,"is_preprint":false},{"pmid":"30578313","id":"PMC_30578313","title":"The Plk1 kinase negatively regulates the Hedgehog signaling pathway by phosphorylating Gli1.","date":"2019","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/30578313","citation_count":13,"is_preprint":false},{"pmid":"39400124","id":"PMC_39400124","title":"β-catenin Orchestrates Gli1+ Cell Fate in Condylar Development and TMJOA.","date":"2024","source":"Journal of dental research","url":"https://pubmed.ncbi.nlm.nih.gov/39400124","citation_count":12,"is_preprint":false},{"pmid":"38284236","id":"PMC_38284236","title":"Gli1+ Periodontal Mesenchymal Stem Cells in Periodontitis.","date":"2024","source":"Journal of dental research","url":"https://pubmed.ncbi.nlm.nih.gov/38284236","citation_count":12,"is_preprint":false},{"pmid":"32430068","id":"PMC_32430068","title":"Gli1 regulates stemness characteristics in gastric adenocarcinoma.","date":"2020","source":"Diagnostic pathology","url":"https://pubmed.ncbi.nlm.nih.gov/32430068","citation_count":12,"is_preprint":false},{"pmid":"30214285","id":"PMC_30214285","title":"Trichostatin A promotes GLI1 degradation and P21 expression in multiple myeloma cells.","date":"2018","source":"Cancer management and research","url":"https://pubmed.ncbi.nlm.nih.gov/30214285","citation_count":12,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":45473,"output_tokens":6064,"usd":0.113689,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14975,"output_tokens":5990,"usd":0.112312,"stage2_stop_reason":"end_turn"},"total_usd":0.226001,"stage1_batch_id":"msgbatch_01DUPACZi7AAWwuZiUjseQF4","stage2_batch_id":"msgbatch_018yt7chE3f48PEFtDwtj6AE","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2014,\n      \"finding\": \"GLI1 binds DNA through its zinc finger domain, and Glabrescione B was identified as the first small molecule that binds to the GLI1 zinc finger domain and impairs GLI1 transcriptional activity by interfering with its interaction with DNA, inhibiting Hedgehog-dependent tumor cell growth and stem cell self-renewal in vitro and in vivo.\",\n      \"method\": \"Structural analysis of GLI1 zinc finger/DNA interaction, small molecule binding assay, Gli-luciferase reporter assay, in vitro and in vivo tumor growth assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structural requirements defined, direct DNA-binding assay with mutagenesis/compound interference, validated in vitro and in vivo in single rigorous study\",\n      \"pmids\": [\"25476449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The deubiquitinase USP48 directly interacts with GLI1 and cleaves ubiquitin from GLI1, thereby stabilizing GLI1 protein and activating Gli-dependent transcription. In turn, GLI1 transcriptionally activates USP48, forming a positive feedback loop to sustain Hedgehog signaling.\",\n      \"method\": \"Co-immunoprecipitation, deubiquitinase activity assay, Gli-luciferase reporter, siRNA knockdown, glioblastoma cell proliferation and tumorigenesis assays, chromatin immunoprecipitation\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct deubiquitinase activity shown, reciprocal interaction established, multiple orthogonal methods in single study\",\n      \"pmids\": [\"28623188\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ERK2 MAP kinase phosphorylates GLI1 on three evolutionarily conserved sites (S102, S116, S130) near the SUFU binding region, and multisite phosphorylation cooperatively weakens GLI1-SUFU binding affinity by over 25-fold, facilitating GLI1 nuclear transcriptional activity.\",\n      \"method\": \"In vitro kinase assay, site-directed mutagenesis, binding affinity measurements, Gli-luciferase reporter in mammalian cells, phosphomimetic substitution experiments\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with mutagenesis, quantified binding affinity changes, cellular transcriptional readout, multiple orthogonal methods\",\n      \"pmids\": [\"35831023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MEKK2 (MAP3K2) and MEKK3 (MAP3K3) phosphorylate GLI1 on multiple Ser/Thr sites, reducing GLI1 protein stability, DNA-binding ability, and increasing GLI1 association with SUFU, thereby inhibiting GLI1 transcriptional activity. MEKK2/3 mediate FGF2-induced inhibition of Hedgehog signaling.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, Gli-luciferase reporter, site-directed mutagenesis, medulloblastoma cell proliferation assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay, co-IP, DNA binding assay, and functional reporter assay, multiple orthogonal methods in single study\",\n      \"pmids\": [\"29662197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Polo-like kinase 1 (Plk1) phosphorylates GLI1 at S481, promoting nuclear export of GLI1 and increasing its association with the negative regulator SUFU, thereby reducing Hedgehog signaling activity. GLI1 expression peaks during G1/S phases and is suppressed by Plk1 during other cell cycle phases.\",\n      \"method\": \"In vitro kinase assay, site-directed mutagenesis, co-immunoprecipitation, subcellular fractionation/nuclear export assay, Gli-luciferase reporter\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct phosphorylation shown in vitro with mutagenesis, SUFU binding and nuclear export demonstrated with multiple orthogonal methods\",\n      \"pmids\": [\"30578313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Protein kinase Cδ (PKCδ) negatively regulates GLI1 transcriptional activity downstream of Smoothened; activated PKCδ decreases Gli-luciferase reporter activity and endogenous GLI1 and PTCH1 expression, while PKCδ siRNA increases these targets.\",\n      \"method\": \"Gli-luciferase reporter assay, siRNA knockdown, western blot, epistasis experiment (cyclopamine rescue with PKCδ siRNA)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis established (PKCδ acts downstream of Smo), reporter and endogenous gene assays, single lab with multiple methods\",\n      \"pmids\": [\"19015273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In the absence of Hedgehog, sequential phosphorylation of Gli by PKA, GSK3, and CKI creates docking sites for the SCF(Slimb/β-TRCP) E3 ubiquitin ligase, promoting Gli ubiquitination and proteasome-mediated proteolytic processing to a truncated transcriptional repressor form.\",\n      \"method\": \"Biochemical phosphorylation assays, ubiquitination assays, proteasome inhibition experiments in Drosophila and mammalian cells\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical reconstitution of phosphorylation cascade and ubiquitination reviewed from multiple independent studies, but this paper is a review compiling others' data\",\n      \"pmids\": [\"17102630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Stabilized β-catenin physically interacts with GLI1 protein, leading to GLI1 sequestration, reduced GLI1 transcriptional activity, and GLI1 degradation, resulting in suppression of Hedgehog signaling, reduced medulloblastoma cell proliferation, G2/M arrest, and promotion of a senescent-like state.\",\n      \"method\": \"Co-immunoprecipitation, proximity ligation assay, Gli-luciferase reporter, cell cycle analysis, medulloblastoma sphere assays, in vivo tumor transplantation\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct physical interaction confirmed by two orthogonal methods (Co-IP and PLA), functional consequences demonstrated in vitro and in vivo, single lab\",\n      \"pmids\": [\"25645196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ADAR1-mediated Alu-dependent adenosine-to-inosine RNA editing of GLI1 enhances GLI1 transcriptional activity and promotes Hedgehog pathway activation; wild-type but not catalytically mutant ADAR1 drives this editing and increases GLI1-mediated transcription, promoting immunomodulatory drug resistance in multiple myeloma.\",\n      \"method\": \"RNA editing analysis, ADAR1 wild-type vs. mutant expression, GLI1 transcriptional reporter assay, siRNA knockdown, patient-derived xenograft transplantation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic dissection using catalytic mutant ADAR1, RNA editing confirmed, transcriptional activity measured, in vivo xenograft validation\",\n      \"pmids\": [\"29203771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Arhgap36 activates GLI transcription factors in a Smoothened-independent manner by inhibiting Gli repressor formation, promoting accumulation of full-length Gli proteins in the primary cilium, and functionally interacting with Suppressor of Fused (SUFU). Arhgap36-induced Gli activation requires KIF3A and IFT88, indicating ciliogenesis is required.\",\n      \"method\": \"Genome-scale cDNA overexpression screen, Gli-luciferase reporter, co-immunoprecipitation with SUFU, cilia accumulation imaging, genetic epistasis with KIF3A/IFT88 knockdown, transcriptional profiling\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional screen identified mechanism, biochemical interaction with SUFU shown, genetic epistasis with cilia components, single lab multiple methods\",\n      \"pmids\": [\"25024229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GLI1 directly regulates DNMT1 gene expression in pancreatic cancer; ChIP assay showed GLI1 protein binds to the DNMT1 promoter. GLI1 also regulates DNMT3a expression, though not through direct promoter binding. GLI1-mediated regulation of DNMT1 affects APC gene methylation.\",\n      \"method\": \"ChIP assay, siRNA knockdown, lentiviral overexpression, qRT-PCR, western blot, methylation-specific PCR\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding demonstrated by ChIP, functional regulation confirmed by knockdown and overexpression with multiple methods, single lab\",\n      \"pmids\": [\"22110720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ULK3 (unc-51 like kinase 3) activates GLI1, and ULK3-dependent GLI1 activation contributes to transcriptional upregulation of DNMT3A gene expression upon autophagy induction; proximity ligation assay and ChIP confirmed GLI1 activity at the DNMT3A promoter.\",\n      \"method\": \"Proximity ligation assay, ChIP, shRNA knockdown, qRT-PCR, Gli-luciferase reporter\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct GLI1 occupancy at DNMT3A promoter shown by ChIP, ULK3-GLI1 interaction by PLA, functional validation by knockdown\",\n      \"pmids\": [\"35226587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PRMT1 methylates GLI1 to upregulate its transcriptional activity and target gene expression; cytoplasmic PRMT5 methylates GLI1 and promotes GLI1 protein stabilization. Nuclear PRMT5 indirectly downregulates GLI1 activity via MENIN-mediated suppression of GAS1 expression.\",\n      \"method\": \"In vitro methylation assay, co-immunoprecipitation, Gli-luciferase reporter, protein stability assays (reviewed from multiple studies)\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — findings are compiled from multiple sources in a review-like paper; primary mechanistic data not directly presented in this abstract\",\n      \"pmids\": [\"32859041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GLI1 and Gli2 directly bind to promoter regions of the NEK2A gene and induce its transcription, as demonstrated by chromatin immunoprecipitation; Nek2A in turn stabilizes SUFU and negatively regulates Hedgehog target genes, forming a negative feedback loop.\",\n      \"method\": \"Chromatin immunoprecipitation, Gli-luciferase reporter, protein stability assay, mRNA/protein expression analysis\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding confirmed by ChIP, functional feedback loop demonstrated with multiple assays, single lab\",\n      \"pmids\": [\"28035348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GLI1 and GLI2 bind Gli binding sites (GBS) within the first intron of the human GLI1 gene in vitro, and elimination of key GBS attenuates transcriptional activation, demonstrating that GLI1 auto-regulates its own expression through a positive feedback loop. GLI1 also binds the histone variant H2A.Z.\",\n      \"method\": \"Electrophoretic mobility shift assay (in vitro DNA binding), transcriptional reporter assays with GBS mutants, ChIP for histone marks and BRD4, co-immunoprecipitation of GLI1 with H2A.Z\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro DNA binding with mutagenesis, transcriptional reporter with deletion constructs, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"31085420\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In hypoxic colorectal cancer cells, CCT2 (T-complex protein 1 subunit beta) interacts with GLI1 and promotes proper folding of GLI1, protecting it from ubiquitination-mediated degradation by β-TrCP; CCT2 knockdown inhibits GLI1-driven tumor growth.\",\n      \"method\": \"Mass spectrometry interaction screen, co-immunoprecipitation, ubiquitination assay, siRNA knockdown, in vivo xenograft model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-identified interaction confirmed by co-IP, ubiquitination mechanism shown, functional consequence demonstrated in vivo, single lab\",\n      \"pmids\": [\"31462707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"GLI1 physically interacts with YAP1 in esophageal squamous cell carcinoma cells, as demonstrated by co-immunoprecipitation; GLI1 upregulates YAP1 in a LATS1-independent manner, while YAP1 induces GLI1 expression via PI3K/AKT signaling, and their interaction promotes tumor growth in vitro and in vivo.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, western blot, in vitro and in vivo tumor growth assays\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — direct protein-protein interaction shown by co-IP, pathway cross-talk confirmed by knockdown experiments, in vivo validation, single lab\",\n      \"pmids\": [\"31957872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"STAT3 directly induces GLI1 gene expression in myelofibrosis fibrocytes; chromatin immunoprecipitation and luciferase assay showed STAT3 binds the GLI1 promoter and activates transcription. GLI1 in turn activates MMP2, MMP9, and procollagen-I expression, contributing to bone marrow fibrosis.\",\n      \"method\": \"Chromatin immunoprecipitation, luciferase reporter assay, siRNA knockdown, western blot, immunofluorescence\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct STAT3 binding to GLI1 promoter shown by ChIP and confirmed by luciferase reporter, downstream GLI1 targets identified, single lab multiple methods\",\n      \"pmids\": [\"35595725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Gli proteins bind to a Gli-binding site in the promoter of the basonuclin gene and transcriptionally activate basonuclin expression, linking Hedgehog-Gli pathway activation to enhanced rRNA transcription in basal cell carcinoma.\",\n      \"method\": \"Gli-luciferase reporter with promoter deletion/mutation, electrophoretic mobility shift assay, in vivo BCC tissue analysis\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct promoter binding by EMSA with required binding site, transcriptional activation confirmed by reporter with mutagenesis, single lab\",\n      \"pmids\": [\"15313903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Trichostatin A (a histone deacetylase inhibitor) promotes proteasome-dependent GLI1 protein degradation in multiple myeloma cells and inhibits nuclear accumulation of GLI1; p21 induction also contributes to GLI1 downregulation at the transcriptional level.\",\n      \"method\": \"Immunofluorescence for GLI1 nuclear localization, immunoprecipitation for ubiquitination, western blot, qPCR, proteasome inhibitor rescue experiment\",\n      \"journal\": \"Cancer management and research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — proteasome-dependent degradation shown by rescue experiment, nuclear localization by IF, but mechanism linking HDAC inhibition to GLI1 ubiquitination not fully established in this abstract\",\n      \"pmids\": [\"30214285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In the MALAT1-GLI1 fusion identified in plexiform fibromyxoma, the truncated GLI1 protein retains its capacity to transcriptionally activate target genes, demonstrated by PCR/sequencing validation of fusion transcript and GLI1 protein overexpression with retained transcriptional activity.\",\n      \"method\": \"PCR on genomic DNA, Sanger sequencing, FISH, immunohistochemistry, transcriptional activation assay\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — fusion protein transcriptional activity inferred from target gene expression, not directly tested by reporter assay with isolated fusion construct in this abstract\",\n      \"pmids\": [\"27101025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Genetic deletion of Gli1 in mice reveals that Gli1 regulates hematopoietic stem cell quiescence and myeloid progenitor proliferation; Gli1-null mice show increased quiescent long-term HSCs with enhanced engraftment, decreased myeloid colony formation, impaired G-CSF response, and reduced Cyclin D1 levels in progenitor cells.\",\n      \"method\": \"Gli1 homozygous knockout mouse, HSC/progenitor functional assays, transplantation/engraftment, colony formation assay, western blot for Cyclin D1\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic knockout with multiple defined phenotypic readouts and molecular endpoint (Cyclin D1), single lab\",\n      \"pmids\": [\"20107231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Gli1 marks peripheral nerve perineurial glia, endoneurial fibroblasts, and pericytes by genetic fate mapping; Gli1 null mice show normal perineurium but form endoneurial minifascicles, demonstrating that Gli1 functions specifically in endoneurial fibroblasts to maintain normal peripheral nerve architecture. Gli1 expression in endoneurial fibroblasts is independent of Hedgehog/Dhh signaling (noncanonical).\",\n      \"method\": \"Genetic fate mapping (Gli1-Cre lineage tracing), Gli1 conditional and constitutive knockout, histological and ultrastructural analysis of peripheral nerves, Dhh null comparison\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic loss-of-function with specific phenotypic readout and pathway independence established by Dhh null comparison, single lab\",\n      \"pmids\": [\"34772739\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RAB23 acts as an upstream negative regulator of canonical Hh-GLI1 signaling and also non-canonically regulates GLI1 through pERK1/2; in Rab23-deficient mice, both canonical HH signaling and FGF10-driven pERK1/2 are elevated, leading to elevated GLI1 expression and aberrant osteoprogenitor proliferation causing craniosynostosis.\",\n      \"method\": \"Rab23 knockout mouse, western blot for GLI1/pERK1/2, pharmacological ERK inhibition with normalization of GLI1, histological analysis, genetic epistasis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with pharmacological rescue establishing pathway position, multiple signaling endpoints measured, single lab\",\n      \"pmids\": [\"32662771\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GLI1 is a zinc-finger transcription factor and terminal effector of the Hedgehog pathway that binds DNA through its zinc finger domain to activate target gene transcription; its activity is regulated by a complex network of post-translational modifications including phosphorylation by PKA/GSK3/CK1 (promoting proteasomal processing to a repressor), phosphorylation by ERK2 at S102/S116/S130 (weakening SUFU binding to activate GLI1), phosphorylation by Plk1 at S481 (promoting nuclear export and SUFU binding to inhibit GLI1), and phosphorylation by MEKK2/3 (reducing stability and DNA-binding); stabilization is achieved by the deubiquitinase USP48 which removes ubiquitin from GLI1; GLI1 is also regulated by arginine methylation by PRMT1/5, RNA editing by ADAR1, physical sequestration by β-catenin, and non-canonical activation through STAT3, RAS/ERK, PI3K/AKT, ULK3, and Arhgap36 pathways, with nuclear localization controlled by a bipartite NLS in its zinc-finger domain.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GLI1 is a zinc-finger transcription factor and terminal effector of the Hedgehog pathway that binds DNA through its zinc-finger domain to activate target gene transcription, and disrupting this DNA contact with the small molecule Glabrescione B suppresses Hedgehog-dependent tumor growth and stem cell self-renewal [#0]. GLI1 autoregulates its own expression through Gli-binding sites in its first intron and engages the histone variant H2A.Z at chromatin, establishing a positive transcriptional feedback loop [#14], and directly activates a broad target program including DNMT1/DNMT3a [#10], DNMT3A upon autophagy induction [#11], NEK2A [#13], basonuclin [#18], and MMP2/MMP9/procollagen-I [#17]. GLI1 activity is gated by an extensive kinase network: ERK2 phosphorylation at S102/S116/S130 cooperatively weakens GLI1–SUFU binding to license nuclear transcriptional activity [#2], whereas MEKK2/3 phosphorylation reduces GLI1 stability and DNA binding while enhancing SUFU association downstream of FGF2 [#3], and Plk1 phosphorylation at S481 drives nuclear export and SUFU binding in a cell-cycle-dependent manner [#4]. Protein-level stability is set opposingly by the deubiquitinase USP48, which removes ubiquitin from GLI1 in a reciprocal positive feedback loop [#1], and the chaperonin subunit CCT2, which folds GLI1 and shields it from β-TrCP-mediated degradation [#15]. GLI1 is further regulated by physical sequestration by β-catenin [#7], ADAR1-mediated A-to-I RNA editing that enhances its activity [#8], and non-canonical inputs from STAT3 [#17], YAP1/PI3K-AKT [#16], ULK3 [#11], and Arhgap36 [#9]. Genetically, Gli1 regulates hematopoietic stem cell quiescence and myeloid progenitor proliferation [#21] and maintains peripheral nerve architecture through endoneurial fibroblasts independently of Hedgehog signaling [#22].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Establishing that GLI1 acts as a direct sequence-specific transcriptional activator required showing it binds a defined promoter element and drives target expression in a disease context.\",\n      \"evidence\": \"Gli-luciferase reporter with promoter mutagenesis and EMSA on the basonuclin promoter in basal cell carcinoma\",\n      \"pmids\": [\"15313903\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Limited to one target gene\", \"Did not address GLI1 post-translational regulation\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defining how GLI is switched off in the absence of Hedgehog clarified the kinase cascade converting full-length GLI to a repressor form.\",\n      \"evidence\": \"Biochemical phosphorylation and ubiquitination assays compiling PKA/GSK3/CKI-primed SCF(Slimb/β-TRCP) processing in Drosophila and mammalian cells (review)\",\n      \"pmids\": [\"17102630\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Review compiling others' data\", \"Focus on repressor processing, not GLI1 activation\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identifying negative regulators downstream of Smoothened placed PKCδ in the pathway as a suppressor of GLI1 output.\",\n      \"evidence\": \"Gli-luciferase reporter, siRNA knockdown, and cyclopamine epistasis in mammalian cells\",\n      \"pmids\": [\"19015273\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct GLI1 phosphorylation site mapped\", \"Mechanism of GLI1 inhibition not defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Genetic deletion revealed an organismal role for Gli1 in regulating hematopoietic stem cell quiescence and myeloid proliferation.\",\n      \"evidence\": \"Gli1 homozygous knockout mouse with HSC/progenitor functional, transplantation, and Cyclin D1 assays\",\n      \"pmids\": [\"20107231\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GLI1 target genes in HSCs not defined\", \"Did not separate canonical vs non-canonical contributions\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Linking GLI1 to epigenetic machinery showed it directly controls DNA methyltransferase expression and downstream gene methylation.\",\n      \"evidence\": \"ChIP at the DNMT1 promoter, knockdown/overexpression, and methylation-specific PCR in pancreatic cancer\",\n      \"pmids\": [\"22110720\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"DNMT3a regulation is indirect\", \"Genome-wide methylation consequences not mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrating that the zinc-finger/DNA interface is druggable established GLI1's DNA-binding domain as the functional and therapeutic core.\",\n      \"evidence\": \"Structural analysis, small-molecule (Glabrescione B) binding/interference assay, Gli-luciferase reporter, and in vitro/in vivo tumor assays\",\n      \"pmids\": [\"25476449\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution GLI1–DNA co-structure reported here\", \"Effect on non-canonical GLI1 activation not addressed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"A non-canonical, Smoothened-independent activator (Arhgap36) was identified that promotes full-length GLI accumulation via the cilium and SUFU interaction.\",\n      \"evidence\": \"Genome-scale cDNA overexpression screen, co-IP with SUFU, cilia imaging, and KIF3A/IFT88 epistasis\",\n      \"pmids\": [\"25024229\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect SUFU modulation unclear\", \"Physiological contexts of Arhgap36-GLI1 axis not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Cross-talk with Wnt was established by showing β-catenin physically sequesters and destabilizes GLI1 to suppress Hedgehog output.\",\n      \"evidence\": \"Co-IP, proximity ligation assay, Gli-luciferase reporter, cell-cycle analysis, and in vivo medulloblastoma transplantation\",\n      \"pmids\": [\"25645196\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interaction interface not mapped\", \"Single lab without reciprocal genetic validation\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"GLI1 was shown to nucleate a negative feedback loop by directly transactivating NEK2A, which stabilizes the inhibitor SUFU.\",\n      \"evidence\": \"ChIP at the NEK2A promoter, reporter assay, and SUFU stability measurements\",\n      \"pmids\": [\"28035348\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Kinetics of feedback not quantified\", \"Generalizability across tissues untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Opposing the repressor-processing pathway, USP48 was identified as a deubiquitinase that directly stabilizes GLI1, forming a positive feedback loop sustaining Hedgehog signaling.\",\n      \"evidence\": \"Co-IP, deubiquitinase activity assay, ChIP, reporter, and glioblastoma tumorigenesis assays\",\n      \"pmids\": [\"28623188\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin chain linkage specificity not defined\", \"Site of deubiquitination on GLI1 unmapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"An RNA-level regulatory layer was uncovered: ADAR1-mediated A-to-I editing of GLI1 enhances its transcriptional activity and drives drug resistance.\",\n      \"evidence\": \"RNA editing analysis, catalytic-mutant ADAR1 comparison, reporter assay, and patient-derived xenografts in multiple myeloma\",\n      \"pmids\": [\"29203771\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Edited residue effect on GLI1 protein not mechanistically dissected\", \"Editing prevalence across tissues unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"MEKK2/3 were defined as inhibitory kinases that destabilize GLI1, reduce its DNA binding, and enhance SUFU association downstream of FGF2.\",\n      \"evidence\": \"In vitro kinase assay, co-IP, DNA-binding assay, reporter, and medulloblastoma proliferation assays\",\n      \"pmids\": [\"29662197\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Exact phosphosites only partially mapped\", \"In vivo relevance of FGF2-MEKK axis not tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Plk1 was shown to impose cell-cycle control on GLI1 by phosphorylating S481 to drive nuclear export and SUFU binding.\",\n      \"evidence\": \"In vitro kinase assay, mutagenesis, subcellular fractionation, co-IP, and reporter assay\",\n      \"pmids\": [\"30578313\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nuclear export machinery for GLI1 not identified\", \"Consequences for cell-cycle-coupled target gene timing not detailed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"GLI1 was shown to autoregulate via intronic Gli-binding sites and engage H2A.Z chromatin, defining a self-amplifying transcriptional loop.\",\n      \"evidence\": \"EMSA with GBS mutants, reporter assays with deletion constructs, ChIP for histone marks/BRD4, and co-IP with H2A.Z\",\n      \"pmids\": [\"31085420\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of H2A.Z interaction unresolved\", \"Quantitative contribution of autoregulation in vivo unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"A chaperonin requirement was established: CCT2 folds GLI1 and protects it from β-TrCP-mediated degradation under hypoxia.\",\n      \"evidence\": \"Mass spectrometry interaction screen, co-IP, ubiquitination assay, knockdown, and xenograft model\",\n      \"pmids\": [\"31462707\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"GLI1 folding intermediates not characterized\", \"Hypoxia-specificity mechanism not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"ULK3 was connected to autophagy-driven GLI1 activation at the DNMT3A promoter, extending GLI1 into autophagy signaling.\",\n      \"evidence\": \"Proximity ligation assay, ChIP at DNMT3A promoter, shRNA knockdown, and reporter assay\",\n      \"pmids\": [\"35226587\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ULK3 phosphorylation of GLI1 not demonstrated\", \"Physiological autophagy contexts not broadly tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"ERK2-equivalent and cross-pathway inputs were clarified, with YAP1/PI3K-AKT cross-talk shown to reciprocally amplify GLI1 in esophageal carcinoma.\",\n      \"evidence\": \"Co-IP, knockdown, and in vitro/in vivo tumor growth assays\",\n      \"pmids\": [\"31957872\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"GLI1-YAP1 interaction interface unmapped\", \"Direct vs indirect transcriptional cooperation unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"PRMT-mediated arginine methylation was reported as a modulator of GLI1 activity and stability with context-dependent direction.\",\n      \"evidence\": \"In vitro methylation, co-IP, reporter, and stability assays compiled in a review-like paper\",\n      \"pmids\": [\"32859041\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Findings compiled from multiple sources, not primary data here\", \"Methylation sites and direction of effect not directly demonstrated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"RAB23 was positioned as an upstream negative regulator acting both canonically and via pERK1/2 to restrain GLI1 in osteoprogenitors.\",\n      \"evidence\": \"Rab23 knockout mouse, western blot for GLI1/pERK1/2, pharmacological ERK inhibition rescue, and histology\",\n      \"pmids\": [\"32662771\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct RAB23 mechanism on GLI1 not shown\", \"Separation of canonical vs ERK contributions incomplete\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Lineage tracing and knockout revealed a Hedgehog-independent role for Gli1 in endoneurial fibroblasts maintaining peripheral nerve architecture.\",\n      \"evidence\": \"Gli1-Cre fate mapping, conditional/constitutive knockout, ultrastructural nerve analysis, and Dhh-null comparison\",\n      \"pmids\": [\"34772739\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Driver of Hedgehog-independent Gli1 expression unknown\", \"Target genes in endoneurial fibroblasts not identified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"ERK2 was defined as a direct activating kinase that phosphorylates S102/S116/S130 to cooperatively release GLI1 from SUFU.\",\n      \"evidence\": \"In vitro kinase assay, mutagenesis, quantitative binding affinity, and phosphomimetic reporter experiments\",\n      \"pmids\": [\"35831023\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream ERK-activating signals into GLI1 not fully traced\", \"In vivo relevance of the >25-fold affinity shift untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"STAT3 was identified as a direct transcriptional inducer of GLI1, with GLI1 driving fibrotic gene expression in myelofibrosis.\",\n      \"evidence\": \"ChIP at the GLI1 promoter, luciferase reporter, knockdown, and immunofluorescence in fibrocytes\",\n      \"pmids\": [\"35595725\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"STAT3-GLI1 axis specificity across tissues unclear\", \"Whether STAT3 also modulates GLI1 protein activity not addressed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the many opposing post-translational, RNA-editing, and cross-pathway inputs are integrated to set net GLI1 transcriptional output in a given cellular context remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model reconciling activating (ERK2, USP48, CCT2) and inhibitory (Plk1, MEKK2/3, β-catenin) inputs\", \"Lack of high-resolution GLI1-DNA structure\", \"Mechanism of Hedgehog-independent GLI1 expression undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 14, 18]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 10, 13, 14, 17, 18]},\n      {\"term_id\": \"GO:0003700\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [4, 19]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2, 3, 4]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [10, 13, 14, 17, 18]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 1, 7, 8, 16, 17]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SUFU\", \"USP48\", \"CCT2\", \"CTNNB1\", \"YAP1\", \"H2AFZ\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}