{"gene":"GLI3","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":1990,"finding":"GLI3 encodes a 190 kDa protein with seven regions of similarity to GLI (53–88% identity), with zinc fingers as the most similar region; the GLI3 protein produced in vitro binds specifically to genomic DNA fragments containing GLI-binding sites, establishing it as a sequence-specific DNA-binding transcription factor.","method":"cDNA cloning, in vitro translation, DNA-binding assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 — direct in vitro DNA-binding assay with recombinant protein; foundational characterization paper","pmids":["2118997"],"is_preprint":false},{"year":1992,"finding":"Gli3 expression is reduced ~50% in heterozygous Xt/+ mice and completely absent in homozygous Xt/Xt mice, with expression detected in developing limb and brain — structures affected in the mutant — establishing Gli3 as the gene disrupted in the extra-toes mouse mutant.","method":"Northern blot, RNase protection assay, in situ hybridization","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods in a single study confirming loss of Gli3 expression correlates with the Xt mutant phenotype","pmids":["1289066"],"is_preprint":false},{"year":1996,"finding":"Sonic hedgehog differentially regulates GLI family members: it up-regulates GLI1 transcription while down-regulating GLI3 expression in limb bud mesenchyme; an activated form of GLI can induce Patched expression, placing GLI/GLI3 downstream of Shh in vertebrate hedgehog signaling.","method":"In situ hybridization, retroviral gain-of-function in chick limb bud, reporter assay","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — in vivo manipulation in chick limb combined with reporter assays; replicated in broader literature","pmids":["8948590"],"is_preprint":false},{"year":1999,"finding":"Full-length GLI3 localizes to the cytoplasm and activates PTCH1 expression (analogous to full-length Ci155); a PHS truncation mutant localizes to the nucleus and represses GLI3-activated PTCH1 expression (analogous to Ci75 repressor); GCPS mutants have no effect on PTCH1 transactivation, consistent with haploinsufficiency. This established that GLI3 undergoes nuclear/cytoplasmic partitioning and has both activator and repressor forms.","method":"Subcellular localization by immunofluorescence, reporter gene (PTCH1 promoter) transfection assays, site-directed mutagenesis reflecting disease mutations","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (localization + functional reporter) with disease-correlated mutant panel; replicated concept from Drosophila Ci studies","pmids":["10077605"],"is_preprint":false},{"year":1999,"finding":"Transactivation capacity of GLI3 was mapped to two independent adjacent activation domains (TA1 and TA2) in the C-terminal third of the protein, defined by cell transfection experiments using GAL4-GLI3 fusion proteins covering different segments.","method":"GAL4-fusion reporter transfection assays in cell culture","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — direct domain-mapping experiment with reporter assay; single lab","pmids":["10441342"],"is_preprint":false},{"year":2002,"finding":"Genetic analysis in Shh−/−;Gli3−/− double-mutant mice shows that Shh and Gli3 are dispensable for limb skeletal element formation, but their interaction is required for digit number and identity. The effects of Shh on skeletal patterning are necessarily mediated through Gli3, establishing Gli3 as the primary downstream effector of Shh in limb patterning.","method":"Genetic epistasis; mouse double-knockout analysis with skeletal phenotyping","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — clean genetic epistasis in vivo with rigorous compound mutant analysis; highly cited foundational study","pmids":["12198547"],"is_preprint":false},{"year":2002,"finding":"A targeted truncating mutation in mice mimicking the PHS mutation (removing sequences 3′ of the zinc-finger domain) causes central polydactyly and a full spectrum of PHS features, demonstrating that the truncated GLI3 protein acts as a constitutive repressor in vivo.","method":"Targeted gene mutation in mice, phenotypic characterization","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — in vivo knock-in truncation model with comprehensive phenotypic analysis recapitulating human disease; strong mechanistic inference","pmids":["11978771"],"is_preprint":false},{"year":2004,"finding":"Elevated Gli3 repressor levels (due to absence of Shh signaling) correlate with increased Bmp4 expression and apoptosis in the developing limb; exogenous Noggin prevents this apoptosis, indicating that Gli3R promotes BMP4-mediated cell death in a position-dependent manner.","method":"Posterior wing bud removal assay, protein immunodetection, bead implantation, Noggin application","journal":"Developmental dynamics","confidence":"Medium","confidence_rationale":"Tier 2 — multiple experimental approaches linking Gli3R levels to Bmp4 expression and apoptosis; moderate evidence as mechanism inferred from correlative and pharmacological data","pmids":["15305295"],"is_preprint":false},{"year":2006,"finding":"GLI3 physically interacts with MED12, a subunit of the RNA Pol II Mediator complex, through a transactivation domain (MBD); this interaction, together with histone acetyltransferase CBP, is required for Gli3-dependent transcriptional activation of Shh target genes. Dominant-negative interference with the Gli3-MED12 interaction inhibits, while MED12 RNAi enhances, both MBD transactivation and Gli3 target gene induction.","method":"Co-immunoprecipitation in vitro and in vivo, GST pulldown, reporter assays, RNAi, dominant-negative overexpression","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 — reciprocal binding assays combined with functional reporter and target gene induction experiments; multiple orthogonal methods in a single study","pmids":["17000779"],"is_preprint":false},{"year":2006,"finding":"GLI3-dependent transcriptional repression controls renal morphogenesis: in the absence of Shh-SMO signaling, GLI3 repressor binds to Shh target gene promoters (Pax2, Sall1, cyclin D1, MYCN, Gli1, Gli2) via chromatin immunoprecipitation, replacing GLI1/GLI2 activators; elimination of Gli3 in Shh−/− mice rescues kidney malformation.","method":"Chromatin immunoprecipitation (ChIP), genetic epistasis (Gli3;Shh double mutants), embryonic kidney explants with cyclopamine, protein immunoblotting","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1–2 — direct ChIP demonstrating GLI3 binding at target loci combined with in vivo genetic rescue; multiple orthogonal methods","pmids":["16396903"],"is_preprint":false},{"year":2007,"finding":"Canonical Wnt/β-catenin/Tcf signaling directly regulates Gli3 expression through conserved Tcf-binding sequences in non-coding DNA regions around the GLI3 gene; dorsal Gli3 expression in the neural tube is directly controlled by Wnt1/Wnt3a, and Gli3 in turn represses ventral Shh/Gli activity to pattern the spinal cord.","method":"Conserved non-coding DNA characterization, reporter assays (Tcf binding sites), in vivo gain/loss-of-function in chick neural tube","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 — reporter assays with identified binding sites plus in vivo functional evidence; single lab","pmids":["18057099"],"is_preprint":false},{"year":2008,"finding":"Identification of a minimal transcriptional repressor domain within GLI3 mapped to residues 106–236 in the N-terminal half; this domain does not utilize histone deacetylases (HDACs) to achieve repression, as demonstrated by HDAC inhibitor treatment and pulldown assays.","method":"Overexpression reporter assays, HDAC inhibitor treatment, pulldown assays, deletion mapping","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 — direct domain mapping with functional reporter assays; single lab, moderate evidence","pmids":["19084012"],"is_preprint":false},{"year":2009,"finding":"Sufu recruits GSK3β to form a trimolecular Gli3/Sufu/GSK3β complex that mediates phosphorylation of Gli3 by GSK3β, which is essential for Gli3 proteolytic processing to generate the transcriptional repressor form. Sonic Hh stimulation dissociates the Sufu/GSK3β complex from Gli3, blocking processing.","method":"Co-immunoprecipitation (Sufu-GSK3β, Sufu-Gli3), Sufu−/− MEFs and siRNA knockdown showing loss of processing, immunoblotting for Gli3 processing","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP establishing trimolecular complex combined with genetic (Sufu KO) and RNAi evidence; mechanistic conclusion well-supported","pmids":["19622347"],"is_preprint":false},{"year":2009,"finding":"Trps1 specifically binds the transactivation domain of the full-length (activator) form of Gli3 in vitro and in vivo; the repressor form of Gli3 does not interact with Trps1. A 185-aa domain of Trps1 containing three predicted zinc fingers is sufficient for the interaction.","method":"Co-immunoprecipitation in vivo, in vitro binding assay, domain mapping with deletion constructs, compound mouse mutant analysis","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro and in vivo binding assays with domain mapping, plus genetic compound mutant validation","pmids":["19389374"],"is_preprint":false},{"year":2009,"finding":"PP2A and the ubiquitin ligase MID1 regulate the nuclear localization and transcriptional activity of GLI3; functional interaction between the MID1-α4-PP2A complex and GLI3 was mapped to amino acids 568–1100 of GLI3; GCPS-associated point mutations in this region lead to misregulation of GLI3 subcellular localization and transcriptional activity.","method":"Co-immunoprecipitation, deletion mapping, subcellular localization by immunofluorescence, reporter assays, GCPS disease mutations","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2–3 — multiple methods (CoIP, localization, reporter) but single lab; domain mapping plus disease mutation functional correlation","pmids":["19829694"],"is_preprint":false},{"year":2011,"finding":"Gli3 repressor (Gli3R) is required for specifying the fate of cortical neurons in temporal order and for maintaining cortical progenitors in active cell cycle; conditional deletion of Gli3 after patterning causes progenitors to exit the cell cycle prematurely, establishing a direct role for Gli3R in cortical neurogenesis.","method":"Conditional mouse knockout, birthdating experiments, in utero electroporation, cell cycle analysis","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with multiple orthogonal readouts (birthdating, in utero electroporation, cell cycle); strong mechanistic link","pmids":["21525285"],"is_preprint":false},{"year":2011,"finding":"Proteasome-mediated partial degradation (processing) of Gli3 requires a three-part signal: the zinc finger domain (as a folded structure), an adjacent linker sequence containing regions of low complexity, and a degron. Gli1 is not processed because its linker sequence and degron are ineffective, despite overall homology.","method":"In vitro proteasome processing assays, domain deletion and mutagenesis, cell-based reporter","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstitution of processing with systematic mutagenesis; mechanistic dissection of processing signal","pmids":["21921029"],"is_preprint":false},{"year":2012,"finding":"GLI3 binds to the VMP1 promoter and complexes with histone acetyltransferase p300 to regulate VMP1 promoter activity, mediating KRAS-induced autophagy downstream of the PI3K-AKT1 pathway in a Hedgehog-independent manner; GLI3 knockdown impairs autophagy and VMP1 expression.","method":"Chromatin immunoprecipitation (GLI3 at VMP1 promoter), Co-IP (GLI3-p300), RNAi knockdown, promoter-reporter assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — direct ChIP plus CoIP plus functional reporter assays; multiple orthogonal methods establishing a non-canonical GLI3 function","pmids":["22535956"],"is_preprint":false},{"year":2012,"finding":"Loss of primary cilia (via Kif3a deletion) or Gli3 alone reduces Gli3 repressor activity and increases cyclin D1 and Fgf15 expression, shortening the G1 phase and causing cortical overgrowth; levels of full-length and repressor Gli3 are tightly regulated during normal cortical development, establishing that primary cilia regulate Gli3 processing to control cortical progenitor cell cycle length.","method":"Conditional Kif3a KO, Gli3 KO, immunoblotting for Gli3 isoforms, cell cycle kinetics measurement, qPCR for target genes","journal":"Developmental neurobiology","confidence":"High","confidence_rationale":"Tier 2 — genetic loss-of-function with quantitative protein isoform detection and target gene analysis; mechanistic link between cilia, Gli3 processing, and cell cycle","pmids":["21976438"],"is_preprint":false},{"year":2016,"finding":"Set7 (a lysine methyltransferase) methylates full-length GLI3 at K436 and K595; methylation at K436 increases Gli3 protein stability, and methylation at K595 increases DNA-binding ability, both enhancing Shh signaling activation. The truncated/repressor form of Gli3 is not methylated.","method":"In vitro methylation assay, site-directed mutagenesis (K436A, K595A), protein stability assay (cycloheximide chase), DNA-binding assay, reporter assays, xenograft tumor models","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 — in vitro enzymatic assay with mutagenesis, combined with functional stability and DNA-binding assays; multiple orthogonal methods","pmids":["27146893"],"is_preprint":false},{"year":2016,"finding":"miR-378a-3p directly targets the Gli3 3′UTR; overexpression of miR-378a-3p reduces Gli3 expression in activated hepatic stellate cells (HSCs) and suppresses profibrotic gene expression; Smo blocks miR-378a-3p transcription via p65 NF-κB activation, revealing an Smo-NF-κB-miR-378a-3p-Gli3 regulatory axis in liver fibrosis.","method":"miRNA target validation (luciferase reporter), miRNA overexpression and inhibition in HSCs, in vivo CCl4 model, NF-κB ChIP/reporter","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — direct target validation by reporter assay plus in vivo and in vitro functional experiments; multiple orthogonal methods","pmids":["27001906"],"is_preprint":false},{"year":2017,"finding":"Hedgehog signaling inhibits PKA-mediated phosphorylation of Gli2 and Gli3 in primary cilia; the Talpid3 centriolar protein interacts with PKA regulatory subunit PKARIIβ at centrioles, and loss of Talpid3 reduces PKARIIβ centriolar localization, resulting in reduced Gli2/Gli3 phosphorylation and impaired processing to repressor forms.","method":"Co-immunoprecipitation (Talpid3-PKARIIβ), immunofluorescence localization, phosphorylation analysis by immunoblot, Gli3 processing assay in mutant cells","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — CoIP plus localization plus processing assays mechanistically linking centriolar PKA localization to Gli3 phosphorylation and processing","pmids":["28673820"],"is_preprint":false},{"year":2017,"finding":"Spop (an E3 ubiquitin ligase adaptor) negatively regulates the level and activator activity of Gli3 in spinal cord patterning; loss of Spop increases Gli3 protein levels and suppresses floor plate/V3 interneuron loss in Gli2 mutants by enhancing Gli3 activator function.","method":"Genetic epistasis (Spop;Gli2 double mutants, Spop;Gli1;Sufu triple mutants), quantitative immunoblotting of Gli3 protein levels","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis combined with quantitative protein level analysis; single lab","pmids":["28412462"],"is_preprint":false},{"year":2018,"finding":"Gli3 controls the onset of cortical neurogenesis by directly regulating Cdk6 expression, thereby setting G1 and S phase length in radial glial cells; pharmacological Cdk6 inhibition rescues the delayed neurogenesis seen in Gli3 conditional mutants.","method":"Conditional mouse KO, gene expression profiling, cell cycle measurements, ChIP (Gli3 at Cdk6 locus), pharmacological rescue with Cdk6 inhibitor","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP establishing direct Gli3 binding at Cdk6 locus, combined with genetic KO and pharmacological rescue; multiple orthogonal methods","pmids":["30093555"],"is_preprint":false},{"year":2019,"finding":"Gli3 activator (GLI3A) in fetal Leydig cells promotes their identity and stimulates INSL3 and testosterone synthesis; reintroduction of GLI3A into Gli3Xt/Xt testes restores Hedgehog pathway and steroidogenic gene expression, establishing a novel function for the activated form of GLI3 in translating Hedgehog signals to reinforce Leydig cell identity.","method":"Gli3XtJ mouse mutant analysis, androgen supplementation rescue, lentiviral GLI3A reintroduction, gene expression profiling","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — direct rescue by re-expression of GLI3A with target gene readout; multiple experimental approaches","pmids":["32497091"],"is_preprint":false},{"year":2019,"finding":"Trps1 and the activator form of Gli3 (Gli3A) directly bind two upstream regulatory sequences in the Wnt5a promoter (identified by ChIP and reporter assays) to activate Wnt5a expression at the onset of chondrocyte hypertrophy; loss of both factors decreases endogenous Wnt5a mRNA and protein levels.","method":"Chromatin immunoprecipitation (Trps1 and Gli3A at Wnt5a promoter), reporter gene assays, compound mouse mutant analysis, qRT-PCR and Western blot","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 1–2 — direct ChIP plus reporter assays plus genetic validation; mechanistically establishes Wnt5a as direct Gli3A/Trps1 target","pmids":["31550480"],"is_preprint":false},{"year":2021,"finding":"GLI3 is a substrate of SPOP-mediated proteasomal degradation; cancer-driver mutations in SPOP abrogate GLI3 degradation and stabilize GLI3 protein. Stabilized GLI3 physically interacts with androgen receptor (AR) and functionally cooperates with it to drive an AR-dependent gene expression program supporting castration-resistant prostate cancer growth.","method":"Co-immunoprecipitation (GLI3-AR), proteasomal degradation assays (SPOP mutants), xenograft tumor models, gene expression analysis","journal":"Molecular cancer research","confidence":"High","confidence_rationale":"Tier 2 — direct CoIP plus degradation assays plus in vivo xenograft; multiple orthogonal methods establishing GLI3-SPOP-AR mechanism","pmids":["34610962"],"is_preprint":false},{"year":2022,"finding":"GLI3 processing by the primary cilium maintains satellite cells in G0 dormancy by suppressing mTORC1 signaling; loss of GLI3 activates mTORC1, driving satellite cells into GAlert and enhancing proliferation, self-renewal, and regenerative capacity without injury.","method":"Conditional satellite cell-specific Gli3 KO, mTORC1 signaling immunoblotting, single-cell cycle analysis, regeneration assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with specific signaling pathway readout (mTORC1) and multiple functional assays; rigorous mechanistic study","pmids":["35803939"],"is_preprint":false}],"current_model":"GLI3 is a bifunctional zinc-finger transcription factor downstream of Sonic Hedgehog (Shh) signaling that is constitutively processed by the proteasome (via a three-part signal requiring the zinc finger domain, a linker, and a degron, facilitated by a Sufu/GSK3β trimolecular complex and PKA-mediated phosphorylation in primary cilia) into a C-terminal repressor form (Gli3R), while Shh signaling blocks this processing to allow the full-length activator form (Gli3A) to translocate to the nucleus, recruit Mediator (via MED12) and CBP, and activate target genes including PTCH1, Gli1, Cdk6, and Wnt5a; Gli3R conversely binds target gene promoters to repress them, and the balance of Gli3A and Gli3R — graded along the AP axis of the limb by posteriorly restricted Shh — controls digit number and identity, cortical progenitor cell cycle length, and numerous other developmental patterning events, with additional post-translational regulation by Set7-mediated methylation (stabilizing Gli3A and enhancing DNA binding), SPOP-mediated ubiquitination/degradation, and PP2A/MID1-dependent nuclear localization control."},"narrative":{"teleology":[{"year":1990,"claim":"Establishing that GLI3 encodes a zinc-finger protein capable of sequence-specific DNA binding resolved the molecular identity of the gene and placed it in the GLI family of transcription factors.","evidence":"cDNA cloning with in vitro translation and DNA-binding assay","pmids":["2118997"],"confidence":"High","gaps":["No in vivo target genes identified","Activator vs. repressor function not yet distinguished","No link to signaling pathway"]},{"year":1992,"claim":"Demonstrating that Gli3 is the gene disrupted in the extra-toes (Xt) mouse mutant connected its molecular identity to a concrete developmental phenotype affecting limb and brain.","evidence":"Northern blot, RNase protection, and in situ hybridization in Xt/+ and Xt/Xt mice","pmids":["1289066"],"confidence":"High","gaps":["Mechanism of limb/brain defect not resolved","No protein-level analysis"]},{"year":1996,"claim":"Positioning GLI3 downstream of Sonic hedgehog signaling established the pathway context: Shh down-regulates Gli3 expression while GLI activates Patched, linking vertebrate Hh signaling to GLI-family transcription factors.","evidence":"In situ hybridization and retroviral gain-of-function in chick limb bud with reporter assays","pmids":["8948590"],"confidence":"High","gaps":["Post-translational processing not yet discovered","Repressor form not distinguished from transcriptional downregulation"]},{"year":1999,"claim":"Discovery that full-length GLI3 is a cytoplasmic activator of PTCH1 while disease-associated truncations produce a nuclear repressor established the bifunctional activator/repressor paradigm and linked it to Pallister–Hall and Greig syndromes.","evidence":"Immunofluorescence localization and PTCH1 promoter-reporter assays with disease-mimicking mutants","pmids":["10077605","10441342"],"confidence":"High","gaps":["Endogenous processing mechanism unknown","Proteasomal involvement not yet shown","In vivo repressor function not demonstrated"]},{"year":2002,"claim":"Genetic epistasis in Shh;Gli3 double-knockout mice and PHS-mimicking knock-in mice proved that Shh patterns the limb primarily by counteracting Gli3 repressor, and that truncated Gli3 is a constitutive repressor in vivo.","evidence":"Mouse compound knockout and targeted truncation mutation with skeletal phenotyping","pmids":["12198547","11978771"],"confidence":"High","gaps":["Biochemical basis of processing not resolved","Target genes of Gli3R in limb not identified"]},{"year":2006,"claim":"ChIP demonstration that Gli3R directly occupies target promoters (Pax2, Sall1, cyclin D1, MYCN, Gli1) in the absence of Shh, and identification of MED12/CBP as coactivators recruited by Gli3A, defined the transcriptional mechanism at both ends of the activator-repressor switch.","evidence":"Chromatin immunoprecipitation in embryonic kidney; Co-IP and GST pulldown of GLI3-MED12 and GLI3-CBP with reporter assays","pmids":["16396903","17000779"],"confidence":"High","gaps":["Genome-wide binding profile not determined","How Gli3R represses without HDACs not fully resolved"]},{"year":2009,"claim":"Identification of the Sufu/GSK3β trimolecular complex that phosphorylates Gli3 to enable processing, and the finding that Shh dissociates this complex, provided a biochemical mechanism for pathway-regulated generation of Gli3R.","evidence":"Co-immunoprecipitation in wild-type and Sufu−/− MEFs with processing assays","pmids":["19622347"],"confidence":"High","gaps":["Exact phosphorylation sites for GSK3β on Gli3 not mapped in this study","Role of PKA priming phosphorylation not integrated"]},{"year":2011,"claim":"Reconstitution of proteasomal processing revealed a tripartite processing signal (zinc finger fold, low-complexity linker, degron) intrinsic to Gli3, explaining why Gli1 escapes processing despite sequence homology.","evidence":"In vitro proteasome processing assay with systematic domain deletion and mutagenesis","pmids":["21921029"],"confidence":"High","gaps":["Structural basis of processing determinant not resolved","E3 ligase(s) delivering Gli3 to the proteasome for processing not identified here"]},{"year":2012,"claim":"Linking Gli3 processing in primary cilia to cortical progenitor cell cycle length (via cyclin D1 and Fgf15) extended the Gli3R paradigm beyond limb patterning to brain development, and revealed a non-canonical role for Gli3A in KRAS-induced autophagy via VMP1/p300.","evidence":"Conditional Kif3a/Gli3 KO with cell cycle kinetics; ChIP of GLI3 at VMP1 promoter with Co-IP of GLI3-p300","pmids":["21976438","22535956"],"confidence":"High","gaps":["Hedgehog-independent regulation of GLI3A activity in autophagy not fully characterized","Relative contributions of Gli3A vs. Gli3R in cortex not quantitatively resolved"]},{"year":2016,"claim":"Set7-mediated methylation at K436 and K595 was shown to stabilize Gli3A protein and enhance its DNA binding, revealing a post-translational activation mechanism that fine-tunes Gli3 activator output independently of processing.","evidence":"In vitro methylation assay, site-directed mutagenesis, cycloheximide chase, DNA-binding and reporter assays","pmids":["27146893"],"confidence":"High","gaps":["Physiological contexts where Set7 regulates Gli3 not broadly mapped","Interplay between methylation and other PTMs (phosphorylation, ubiquitination) not resolved"]},{"year":2017,"claim":"Demonstration that PKA localizes to centrioles via Talpid3-PKARIIβ interaction and that Hh inhibits PKA-mediated Gli3 phosphorylation at cilia established the spatial logic of Gli3 processing regulation within the cilium.","evidence":"Co-IP of Talpid3-PKARIIβ, immunofluorescence localization, phosphorylation and processing assays in mutant cells","pmids":["28673820"],"confidence":"High","gaps":["Direct measurement of ciliary PKA activity changes upon Hh stimulation not shown","Whether all PKA-dependent Gli3 phosphorylation occurs at cilia not established"]},{"year":2018,"claim":"ChIP identification of Cdk6 as a direct Gli3 target in cortical progenitors, with pharmacological rescue of the Gli3 mutant phenotype by Cdk6 inhibition, established a precise transcriptional mechanism linking Gli3 to cell cycle control in neurogenesis.","evidence":"Conditional KO, ChIP at Cdk6 locus, pharmacological Cdk6 inhibitor rescue","pmids":["30093555"],"confidence":"High","gaps":["Whether Gli3A or Gli3R binds the Cdk6 promoter not definitively resolved","Other direct cell cycle targets not comprehensively identified"]},{"year":2019,"claim":"Identification of Wnt5a as a direct co-regulated target of Gli3A and Trps1 during chondrocyte hypertrophy, and of Gli3A as a driver of fetal Leydig cell identity, broadened the activator's known target repertoire and tissue contexts.","evidence":"ChIP of Gli3A and Trps1 at Wnt5a promoter with compound mutant validation; lentiviral GLI3A rescue in Gli3Xt/Xt testes","pmids":["31550480","32497091"],"confidence":"High","gaps":["Full Gli3A cistrome in these tissues not determined","How Trps1 selectively binds Gli3A but not Gli3R structurally unexplained"]},{"year":2021,"claim":"Demonstrating that SPOP-mediated ubiquitination degrades Gli3 and that cancer-driver SPOP mutations stabilize Gli3 to cooperate with androgen receptor revealed a pathological consequence of disrupted Gli3 turnover in prostate cancer.","evidence":"Co-IP of GLI3-AR, SPOP-dependent degradation assays with cancer mutants, xenograft tumor models","pmids":["34610962"],"confidence":"High","gaps":["Whether Gli3A or both isoforms are SPOP substrates not fully clarified","GLI3-AR co-target genes not comprehensively identified"]},{"year":2022,"claim":"Conditional knockout in satellite cells showed that Gli3R processed in primary cilia suppresses mTORC1 to maintain G0 dormancy, extending the Gli3 paradigm to adult stem cell quiescence regulation.","evidence":"Satellite cell-specific conditional Gli3 KO with mTORC1 immunoblotting, single-cell cycle analysis, regeneration assays","pmids":["35803939"],"confidence":"High","gaps":["Direct transcriptional targets of Gli3R that suppress mTORC1 not identified","Whether pharmacological Hh modulation can toggle satellite cell states via Gli3 not tested"]},{"year":null,"claim":"A genome-wide map of Gli3A and Gli3R binding sites across tissues, the structural basis for proteasomal partial processing, and the integration of multiple post-translational inputs (PKA, GSK3β, Set7, SPOP, PP2A/MID1) into a quantitative model of Gli3 activator-repressor balance remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No genome-wide ChIP-seq across multiple tissues distinguishing Gli3A from Gli3R occupancy","Structural mechanism of proteasomal partial processing not solved","Quantitative integration of competing PTMs on Gli3 not modeled"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,9,19,25]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[3,4,8,9,11,17,23,24,25]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,14,15]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,12]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[18,21,27]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,5,12,21,27]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[8,9,17,23,25]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5,6,15,24]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[18,23,27]}],"complexes":["Gli3/Sufu/GSK3β processing complex"],"partners":["SUFU","GSK3B","MED12","CREBBP","TRPS1","SPOP","AR","MID1"],"other_free_text":[]},"mechanistic_narrative":"GLI3 is a bifunctional zinc-finger transcription factor that serves as the principal effector of Hedgehog (Hh) signaling in vertebrate development, toggling between a full-length transcriptional activator (Gli3A) and a proteolytically processed repressor (Gli3R) to control digit patterning, cortical neurogenesis, renal morphogenesis, and muscle stem cell quiescence [PMID:12198547, PMID:21525285, PMID:16396903, PMID:35803939]. Processing to Gli3R requires proteasomal partial degradation directed by a tripartite signal (zinc finger domain, linker, degron), facilitated by PKA phosphorylation at primary cilia and a Sufu/GSK3β complex, while Shh signaling blocks processing to allow Gli3A to accumulate and recruit Mediator (via MED12) and CBP/p300 to activate targets including PTCH1, Gli1, Cdk6, and Wnt5a [PMID:21921029, PMID:19622347, PMID:28673820, PMID:17000779, PMID:30093555, PMID:31550480]. Gli3A is further regulated by Set7-mediated methylation that stabilizes the protein and enhances DNA binding, and by SPOP-mediated ubiquitination that promotes its degradation; cancer-associated SPOP mutations stabilize GLI3, enabling cooperation with androgen receptor in prostate cancer [PMID:27146893, PMID:34610962]. Heterozygous loss-of-function mutations cause Greig cephalopolysyndactyly syndrome (GCPS), while truncating mutations producing a constitutive repressor cause Pallister–Hall syndrome (PHS), as demonstrated by knock-in mouse models [PMID:10077605, PMID:11978771]."},"prefetch_data":{"uniprot":{"accession":"P10071","full_name":"Transcriptional activator GLI3","aliases":["GLI3 form of 190 kDa","GLI3-190","GLI3 full-length protein","GLI3FL"],"length_aa":1580,"mass_kda":169.9,"function":"Has a dual function as a transcriptional activator and a repressor of the sonic hedgehog (Shh) pathway, and plays a role in limb development. The full-length GLI3 form (GLI3FL) after phosphorylation and nuclear translocation, acts as an activator (GLI3A) while GLI3R, its C-terminally truncated form, acts as a repressor. A proper balance between the GLI3 activator and the repressor GLI3R, rather than the repressor gradient itself or the activator/repressor ratio gradient, specifies limb digit number and identity. In concert with TRPS1, plays a role in regulating the size of the zone of distal chondrocytes, in restricting the zone of PTHLH expression in distal cells and in activating chondrocyte proliferation. 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: an official publication of the American Association of Anatomists","url":"https://pubmed.ncbi.nlm.nih.gov/17266131","citation_count":21,"is_preprint":false},{"pmid":"32497091","id":"PMC_32497091","title":"GLI3 resides at the intersection of hedgehog and androgen action to promote male sex differentiation.","date":"2020","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/32497091","citation_count":21,"is_preprint":false},{"pmid":"15065125","id":"PMC_15065125","title":"Loss of Gli3 and Shh function disrupts olfactory axon trajectories.","date":"2004","source":"The Journal of comparative neurology","url":"https://pubmed.ncbi.nlm.nih.gov/15065125","citation_count":21,"is_preprint":false},{"pmid":"25859185","id":"PMC_25859185","title":"Differential requirements for Gli2 and Gli3 in the regional specification of the mouse hypothalamus.","date":"2015","source":"Frontiers in 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transcription factor Gli3 promotes B cell development in fetal liver through repression of Shh.","date":"2017","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/28533268","citation_count":19,"is_preprint":false},{"pmid":"30445565","id":"PMC_30445565","title":"Altered GLI3 and FGF8 signaling underlies acrocallosal syndrome phenotypes in Kif7 depleted mice.","date":"2019","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/30445565","citation_count":18,"is_preprint":false},{"pmid":"21925158","id":"PMC_21925158","title":"Shh and Gli3 regulate formation of the telencephalic-diencephalic junction and suppress an isthmus-like signaling source in the forebrain.","date":"2011","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/21925158","citation_count":18,"is_preprint":false},{"pmid":"25267529","id":"PMC_25267529","title":"A novel GLI3 mutation affecting the zinc finger domain leads to preaxial-postaxial polydactyly-syndactyly complex.","date":"2014","source":"BMC medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25267529","citation_count":18,"is_preprint":false},{"pmid":"16867870","id":"PMC_16867870","title":"HIP/PAP, a member of the reg family, is expressed in glucagon-producing enteropancreatic endocrine cells and tumors.","date":"2006","source":"Human pathology","url":"https://pubmed.ncbi.nlm.nih.gov/16867870","citation_count":18,"is_preprint":false},{"pmid":"30225645","id":"PMC_30225645","title":"Imaging findings of sterile pyogenic arthritis, pyoderma gangrenosum and acne (PAPA) syndrome: differential diagnosis and review of the literature.","date":"2018","source":"Pediatric radiology","url":"https://pubmed.ncbi.nlm.nih.gov/30225645","citation_count":18,"is_preprint":false},{"pmid":"32708452","id":"PMC_32708452","title":"Downregulation of GLI3 Expression Mediates Chemotherapy Resistance in Acute Myeloid Leukemia.","date":"2020","source":"International journal of molecular 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Part A, Clinical and molecular teratology","url":"https://pubmed.ncbi.nlm.nih.gov/18655123","citation_count":17,"is_preprint":false},{"pmid":"26755158","id":"PMC_26755158","title":"Regulation of Expression of Uropathogenic Escherichia coli Nonfimbrial Adhesin TosA by PapB Homolog TosR in Conjunction with H-NS and Lrp.","date":"2016","source":"Infection and immunity","url":"https://pubmed.ncbi.nlm.nih.gov/26755158","citation_count":16,"is_preprint":false},{"pmid":"26656997","id":"PMC_26656997","title":"Direct Interactions Between Gli3, Wnt8b, and Fgfs Underlie Patterning of the Dorsal Telencephalon.","date":"2017","source":"Cerebral cortex (New York, N.Y. : 1991)","url":"https://pubmed.ncbi.nlm.nih.gov/26656997","citation_count":16,"is_preprint":false},{"pmid":"26288817","id":"PMC_26288817","title":"GLI3 Links Environmental Arsenic Exposure and Human Fetal Growth.","date":"2015","source":"EBioMedicine","url":"https://pubmed.ncbi.nlm.nih.gov/26288817","citation_count":16,"is_preprint":false},{"pmid":"24667698","id":"PMC_24667698","title":"Novel frame-shift mutations of GLI3 gene in non-syndromic postaxial polydactyly patients.","date":"2014","source":"Clinica chimica acta; international journal of clinical chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/24667698","citation_count":16,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":45721,"output_tokens":6726,"usd":0.119026},"stage2":{"model":"claude-opus-4-6","input_tokens":10478,"output_tokens":3766,"usd":0.21981},"total_usd":0.338836,"stage1_batch_id":"msgbatch_01DzrsgVgYngY1hvM3DU1yF2","stage2_batch_id":"msgbatch_01KA9b7iRzKFdhoBUT7vCvSe","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1990,\n      \"finding\": \"GLI3 encodes a 190 kDa protein with seven regions of similarity to GLI (53–88% identity), with zinc fingers as the most similar region; the GLI3 protein produced in vitro binds specifically to genomic DNA fragments containing GLI-binding sites, establishing it as a sequence-specific DNA-binding transcription factor.\",\n      \"method\": \"cDNA cloning, in vitro translation, DNA-binding assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct in vitro DNA-binding assay with recombinant protein; foundational characterization paper\",\n      \"pmids\": [\"2118997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Gli3 expression is reduced ~50% in heterozygous Xt/+ mice and completely absent in homozygous Xt/Xt mice, with expression detected in developing limb and brain — structures affected in the mutant — establishing Gli3 as the gene disrupted in the extra-toes mouse mutant.\",\n      \"method\": \"Northern blot, RNase protection assay, in situ hybridization\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in a single study confirming loss of Gli3 expression correlates with the Xt mutant phenotype\",\n      \"pmids\": [\"1289066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Sonic hedgehog differentially regulates GLI family members: it up-regulates GLI1 transcription while down-regulating GLI3 expression in limb bud mesenchyme; an activated form of GLI can induce Patched expression, placing GLI/GLI3 downstream of Shh in vertebrate hedgehog signaling.\",\n      \"method\": \"In situ hybridization, retroviral gain-of-function in chick limb bud, reporter assay\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo manipulation in chick limb combined with reporter assays; replicated in broader literature\",\n      \"pmids\": [\"8948590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Full-length GLI3 localizes to the cytoplasm and activates PTCH1 expression (analogous to full-length Ci155); a PHS truncation mutant localizes to the nucleus and represses GLI3-activated PTCH1 expression (analogous to Ci75 repressor); GCPS mutants have no effect on PTCH1 transactivation, consistent with haploinsufficiency. This established that GLI3 undergoes nuclear/cytoplasmic partitioning and has both activator and repressor forms.\",\n      \"method\": \"Subcellular localization by immunofluorescence, reporter gene (PTCH1 promoter) transfection assays, site-directed mutagenesis reflecting disease mutations\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (localization + functional reporter) with disease-correlated mutant panel; replicated concept from Drosophila Ci studies\",\n      \"pmids\": [\"10077605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Transactivation capacity of GLI3 was mapped to two independent adjacent activation domains (TA1 and TA2) in the C-terminal third of the protein, defined by cell transfection experiments using GAL4-GLI3 fusion proteins covering different segments.\",\n      \"method\": \"GAL4-fusion reporter transfection assays in cell culture\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct domain-mapping experiment with reporter assay; single lab\",\n      \"pmids\": [\"10441342\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Genetic analysis in Shh−/−;Gli3−/− double-mutant mice shows that Shh and Gli3 are dispensable for limb skeletal element formation, but their interaction is required for digit number and identity. The effects of Shh on skeletal patterning are necessarily mediated through Gli3, establishing Gli3 as the primary downstream effector of Shh in limb patterning.\",\n      \"method\": \"Genetic epistasis; mouse double-knockout analysis with skeletal phenotyping\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic epistasis in vivo with rigorous compound mutant analysis; highly cited foundational study\",\n      \"pmids\": [\"12198547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"A targeted truncating mutation in mice mimicking the PHS mutation (removing sequences 3′ of the zinc-finger domain) causes central polydactyly and a full spectrum of PHS features, demonstrating that the truncated GLI3 protein acts as a constitutive repressor in vivo.\",\n      \"method\": \"Targeted gene mutation in mice, phenotypic characterization\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo knock-in truncation model with comprehensive phenotypic analysis recapitulating human disease; strong mechanistic inference\",\n      \"pmids\": [\"11978771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Elevated Gli3 repressor levels (due to absence of Shh signaling) correlate with increased Bmp4 expression and apoptosis in the developing limb; exogenous Noggin prevents this apoptosis, indicating that Gli3R promotes BMP4-mediated cell death in a position-dependent manner.\",\n      \"method\": \"Posterior wing bud removal assay, protein immunodetection, bead implantation, Noggin application\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple experimental approaches linking Gli3R levels to Bmp4 expression and apoptosis; moderate evidence as mechanism inferred from correlative and pharmacological data\",\n      \"pmids\": [\"15305295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"GLI3 physically interacts with MED12, a subunit of the RNA Pol II Mediator complex, through a transactivation domain (MBD); this interaction, together with histone acetyltransferase CBP, is required for Gli3-dependent transcriptional activation of Shh target genes. Dominant-negative interference with the Gli3-MED12 interaction inhibits, while MED12 RNAi enhances, both MBD transactivation and Gli3 target gene induction.\",\n      \"method\": \"Co-immunoprecipitation in vitro and in vivo, GST pulldown, reporter assays, RNAi, dominant-negative overexpression\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reciprocal binding assays combined with functional reporter and target gene induction experiments; multiple orthogonal methods in a single study\",\n      \"pmids\": [\"17000779\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"GLI3-dependent transcriptional repression controls renal morphogenesis: in the absence of Shh-SMO signaling, GLI3 repressor binds to Shh target gene promoters (Pax2, Sall1, cyclin D1, MYCN, Gli1, Gli2) via chromatin immunoprecipitation, replacing GLI1/GLI2 activators; elimination of Gli3 in Shh−/− mice rescues kidney malformation.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), genetic epistasis (Gli3;Shh double mutants), embryonic kidney explants with cyclopamine, protein immunoblotting\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct ChIP demonstrating GLI3 binding at target loci combined with in vivo genetic rescue; multiple orthogonal methods\",\n      \"pmids\": [\"16396903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Canonical Wnt/β-catenin/Tcf signaling directly regulates Gli3 expression through conserved Tcf-binding sequences in non-coding DNA regions around the GLI3 gene; dorsal Gli3 expression in the neural tube is directly controlled by Wnt1/Wnt3a, and Gli3 in turn represses ventral Shh/Gli activity to pattern the spinal cord.\",\n      \"method\": \"Conserved non-coding DNA characterization, reporter assays (Tcf binding sites), in vivo gain/loss-of-function in chick neural tube\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reporter assays with identified binding sites plus in vivo functional evidence; single lab\",\n      \"pmids\": [\"18057099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Identification of a minimal transcriptional repressor domain within GLI3 mapped to residues 106–236 in the N-terminal half; this domain does not utilize histone deacetylases (HDACs) to achieve repression, as demonstrated by HDAC inhibitor treatment and pulldown assays.\",\n      \"method\": \"Overexpression reporter assays, HDAC inhibitor treatment, pulldown assays, deletion mapping\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct domain mapping with functional reporter assays; single lab, moderate evidence\",\n      \"pmids\": [\"19084012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Sufu recruits GSK3β to form a trimolecular Gli3/Sufu/GSK3β complex that mediates phosphorylation of Gli3 by GSK3β, which is essential for Gli3 proteolytic processing to generate the transcriptional repressor form. Sonic Hh stimulation dissociates the Sufu/GSK3β complex from Gli3, blocking processing.\",\n      \"method\": \"Co-immunoprecipitation (Sufu-GSK3β, Sufu-Gli3), Sufu−/− MEFs and siRNA knockdown showing loss of processing, immunoblotting for Gli3 processing\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP establishing trimolecular complex combined with genetic (Sufu KO) and RNAi evidence; mechanistic conclusion well-supported\",\n      \"pmids\": [\"19622347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Trps1 specifically binds the transactivation domain of the full-length (activator) form of Gli3 in vitro and in vivo; the repressor form of Gli3 does not interact with Trps1. A 185-aa domain of Trps1 containing three predicted zinc fingers is sufficient for the interaction.\",\n      \"method\": \"Co-immunoprecipitation in vivo, in vitro binding assay, domain mapping with deletion constructs, compound mouse mutant analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro and in vivo binding assays with domain mapping, plus genetic compound mutant validation\",\n      \"pmids\": [\"19389374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PP2A and the ubiquitin ligase MID1 regulate the nuclear localization and transcriptional activity of GLI3; functional interaction between the MID1-α4-PP2A complex and GLI3 was mapped to amino acids 568–1100 of GLI3; GCPS-associated point mutations in this region lead to misregulation of GLI3 subcellular localization and transcriptional activity.\",\n      \"method\": \"Co-immunoprecipitation, deletion mapping, subcellular localization by immunofluorescence, reporter assays, GCPS disease mutations\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — multiple methods (CoIP, localization, reporter) but single lab; domain mapping plus disease mutation functional correlation\",\n      \"pmids\": [\"19829694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Gli3 repressor (Gli3R) is required for specifying the fate of cortical neurons in temporal order and for maintaining cortical progenitors in active cell cycle; conditional deletion of Gli3 after patterning causes progenitors to exit the cell cycle prematurely, establishing a direct role for Gli3R in cortical neurogenesis.\",\n      \"method\": \"Conditional mouse knockout, birthdating experiments, in utero electroporation, cell cycle analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with multiple orthogonal readouts (birthdating, in utero electroporation, cell cycle); strong mechanistic link\",\n      \"pmids\": [\"21525285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Proteasome-mediated partial degradation (processing) of Gli3 requires a three-part signal: the zinc finger domain (as a folded structure), an adjacent linker sequence containing regions of low complexity, and a degron. Gli1 is not processed because its linker sequence and degron are ineffective, despite overall homology.\",\n      \"method\": \"In vitro proteasome processing assays, domain deletion and mutagenesis, cell-based reporter\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution of processing with systematic mutagenesis; mechanistic dissection of processing signal\",\n      \"pmids\": [\"21921029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GLI3 binds to the VMP1 promoter and complexes with histone acetyltransferase p300 to regulate VMP1 promoter activity, mediating KRAS-induced autophagy downstream of the PI3K-AKT1 pathway in a Hedgehog-independent manner; GLI3 knockdown impairs autophagy and VMP1 expression.\",\n      \"method\": \"Chromatin immunoprecipitation (GLI3 at VMP1 promoter), Co-IP (GLI3-p300), RNAi knockdown, promoter-reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct ChIP plus CoIP plus functional reporter assays; multiple orthogonal methods establishing a non-canonical GLI3 function\",\n      \"pmids\": [\"22535956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Loss of primary cilia (via Kif3a deletion) or Gli3 alone reduces Gli3 repressor activity and increases cyclin D1 and Fgf15 expression, shortening the G1 phase and causing cortical overgrowth; levels of full-length and repressor Gli3 are tightly regulated during normal cortical development, establishing that primary cilia regulate Gli3 processing to control cortical progenitor cell cycle length.\",\n      \"method\": \"Conditional Kif3a KO, Gli3 KO, immunoblotting for Gli3 isoforms, cell cycle kinetics measurement, qPCR for target genes\",\n      \"journal\": \"Developmental neurobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic loss-of-function with quantitative protein isoform detection and target gene analysis; mechanistic link between cilia, Gli3 processing, and cell cycle\",\n      \"pmids\": [\"21976438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Set7 (a lysine methyltransferase) methylates full-length GLI3 at K436 and K595; methylation at K436 increases Gli3 protein stability, and methylation at K595 increases DNA-binding ability, both enhancing Shh signaling activation. The truncated/repressor form of Gli3 is not methylated.\",\n      \"method\": \"In vitro methylation assay, site-directed mutagenesis (K436A, K595A), protein stability assay (cycloheximide chase), DNA-binding assay, reporter assays, xenograft tumor models\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro enzymatic assay with mutagenesis, combined with functional stability and DNA-binding assays; multiple orthogonal methods\",\n      \"pmids\": [\"27146893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"miR-378a-3p directly targets the Gli3 3′UTR; overexpression of miR-378a-3p reduces Gli3 expression in activated hepatic stellate cells (HSCs) and suppresses profibrotic gene expression; Smo blocks miR-378a-3p transcription via p65 NF-κB activation, revealing an Smo-NF-κB-miR-378a-3p-Gli3 regulatory axis in liver fibrosis.\",\n      \"method\": \"miRNA target validation (luciferase reporter), miRNA overexpression and inhibition in HSCs, in vivo CCl4 model, NF-κB ChIP/reporter\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct target validation by reporter assay plus in vivo and in vitro functional experiments; multiple orthogonal methods\",\n      \"pmids\": [\"27001906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Hedgehog signaling inhibits PKA-mediated phosphorylation of Gli2 and Gli3 in primary cilia; the Talpid3 centriolar protein interacts with PKA regulatory subunit PKARIIβ at centrioles, and loss of Talpid3 reduces PKARIIβ centriolar localization, resulting in reduced Gli2/Gli3 phosphorylation and impaired processing to repressor forms.\",\n      \"method\": \"Co-immunoprecipitation (Talpid3-PKARIIβ), immunofluorescence localization, phosphorylation analysis by immunoblot, Gli3 processing assay in mutant cells\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — CoIP plus localization plus processing assays mechanistically linking centriolar PKA localization to Gli3 phosphorylation and processing\",\n      \"pmids\": [\"28673820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Spop (an E3 ubiquitin ligase adaptor) negatively regulates the level and activator activity of Gli3 in spinal cord patterning; loss of Spop increases Gli3 protein levels and suppresses floor plate/V3 interneuron loss in Gli2 mutants by enhancing Gli3 activator function.\",\n      \"method\": \"Genetic epistasis (Spop;Gli2 double mutants, Spop;Gli1;Sufu triple mutants), quantitative immunoblotting of Gli3 protein levels\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis combined with quantitative protein level analysis; single lab\",\n      \"pmids\": [\"28412462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Gli3 controls the onset of cortical neurogenesis by directly regulating Cdk6 expression, thereby setting G1 and S phase length in radial glial cells; pharmacological Cdk6 inhibition rescues the delayed neurogenesis seen in Gli3 conditional mutants.\",\n      \"method\": \"Conditional mouse KO, gene expression profiling, cell cycle measurements, ChIP (Gli3 at Cdk6 locus), pharmacological rescue with Cdk6 inhibitor\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP establishing direct Gli3 binding at Cdk6 locus, combined with genetic KO and pharmacological rescue; multiple orthogonal methods\",\n      \"pmids\": [\"30093555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Gli3 activator (GLI3A) in fetal Leydig cells promotes their identity and stimulates INSL3 and testosterone synthesis; reintroduction of GLI3A into Gli3Xt/Xt testes restores Hedgehog pathway and steroidogenic gene expression, establishing a novel function for the activated form of GLI3 in translating Hedgehog signals to reinforce Leydig cell identity.\",\n      \"method\": \"Gli3XtJ mouse mutant analysis, androgen supplementation rescue, lentiviral GLI3A reintroduction, gene expression profiling\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct rescue by re-expression of GLI3A with target gene readout; multiple experimental approaches\",\n      \"pmids\": [\"32497091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Trps1 and the activator form of Gli3 (Gli3A) directly bind two upstream regulatory sequences in the Wnt5a promoter (identified by ChIP and reporter assays) to activate Wnt5a expression at the onset of chondrocyte hypertrophy; loss of both factors decreases endogenous Wnt5a mRNA and protein levels.\",\n      \"method\": \"Chromatin immunoprecipitation (Trps1 and Gli3A at Wnt5a promoter), reporter gene assays, compound mouse mutant analysis, qRT-PCR and Western blot\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct ChIP plus reporter assays plus genetic validation; mechanistically establishes Wnt5a as direct Gli3A/Trps1 target\",\n      \"pmids\": [\"31550480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GLI3 is a substrate of SPOP-mediated proteasomal degradation; cancer-driver mutations in SPOP abrogate GLI3 degradation and stabilize GLI3 protein. Stabilized GLI3 physically interacts with androgen receptor (AR) and functionally cooperates with it to drive an AR-dependent gene expression program supporting castration-resistant prostate cancer growth.\",\n      \"method\": \"Co-immunoprecipitation (GLI3-AR), proteasomal degradation assays (SPOP mutants), xenograft tumor models, gene expression analysis\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct CoIP plus degradation assays plus in vivo xenograft; multiple orthogonal methods establishing GLI3-SPOP-AR mechanism\",\n      \"pmids\": [\"34610962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"GLI3 processing by the primary cilium maintains satellite cells in G0 dormancy by suppressing mTORC1 signaling; loss of GLI3 activates mTORC1, driving satellite cells into GAlert and enhancing proliferation, self-renewal, and regenerative capacity without injury.\",\n      \"method\": \"Conditional satellite cell-specific Gli3 KO, mTORC1 signaling immunoblotting, single-cell cycle analysis, regeneration assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with specific signaling pathway readout (mTORC1) and multiple functional assays; rigorous mechanistic study\",\n      \"pmids\": [\"35803939\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GLI3 is a bifunctional zinc-finger transcription factor downstream of Sonic Hedgehog (Shh) signaling that is constitutively processed by the proteasome (via a three-part signal requiring the zinc finger domain, a linker, and a degron, facilitated by a Sufu/GSK3β trimolecular complex and PKA-mediated phosphorylation in primary cilia) into a C-terminal repressor form (Gli3R), while Shh signaling blocks this processing to allow the full-length activator form (Gli3A) to translocate to the nucleus, recruit Mediator (via MED12) and CBP, and activate target genes including PTCH1, Gli1, Cdk6, and Wnt5a; Gli3R conversely binds target gene promoters to repress them, and the balance of Gli3A and Gli3R — graded along the AP axis of the limb by posteriorly restricted Shh — controls digit number and identity, cortical progenitor cell cycle length, and numerous other developmental patterning events, with additional post-translational regulation by Set7-mediated methylation (stabilizing Gli3A and enhancing DNA binding), SPOP-mediated ubiquitination/degradation, and PP2A/MID1-dependent nuclear localization control.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"GLI3 is a bifunctional zinc-finger transcription factor that serves as the principal effector of Hedgehog (Hh) signaling in vertebrate development, toggling between a full-length transcriptional activator (Gli3A) and a proteolytically processed repressor (Gli3R) to control digit patterning, cortical neurogenesis, renal morphogenesis, and muscle stem cell quiescence [PMID:12198547, PMID:21525285, PMID:16396903, PMID:35803939]. Processing to Gli3R requires proteasomal partial degradation directed by a tripartite signal (zinc finger domain, linker, degron), facilitated by PKA phosphorylation at primary cilia and a Sufu/GSK3β complex, while Shh signaling blocks processing to allow Gli3A to accumulate and recruit Mediator (via MED12) and CBP/p300 to activate targets including PTCH1, Gli1, Cdk6, and Wnt5a [PMID:21921029, PMID:19622347, PMID:28673820, PMID:17000779, PMID:30093555, PMID:31550480]. Gli3A is further regulated by Set7-mediated methylation that stabilizes the protein and enhances DNA binding, and by SPOP-mediated ubiquitination that promotes its degradation; cancer-associated SPOP mutations stabilize GLI3, enabling cooperation with androgen receptor in prostate cancer [PMID:27146893, PMID:34610962]. Heterozygous loss-of-function mutations cause Greig cephalopolysyndactyly syndrome (GCPS), while truncating mutations producing a constitutive repressor cause Pallister–Hall syndrome (PHS), as demonstrated by knock-in mouse models [PMID:10077605, PMID:11978771].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Establishing that GLI3 encodes a zinc-finger protein capable of sequence-specific DNA binding resolved the molecular identity of the gene and placed it in the GLI family of transcription factors.\",\n      \"evidence\": \"cDNA cloning with in vitro translation and DNA-binding assay\",\n      \"pmids\": [\"2118997\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No in vivo target genes identified\", \"Activator vs. repressor function not yet distinguished\", \"No link to signaling pathway\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Demonstrating that Gli3 is the gene disrupted in the extra-toes (Xt) mouse mutant connected its molecular identity to a concrete developmental phenotype affecting limb and brain.\",\n      \"evidence\": \"Northern blot, RNase protection, and in situ hybridization in Xt/+ and Xt/Xt mice\",\n      \"pmids\": [\"1289066\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of limb/brain defect not resolved\", \"No protein-level analysis\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Positioning GLI3 downstream of Sonic hedgehog signaling established the pathway context: Shh down-regulates Gli3 expression while GLI activates Patched, linking vertebrate Hh signaling to GLI-family transcription factors.\",\n      \"evidence\": \"In situ hybridization and retroviral gain-of-function in chick limb bud with reporter assays\",\n      \"pmids\": [\"8948590\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Post-translational processing not yet discovered\", \"Repressor form not distinguished from transcriptional downregulation\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Discovery that full-length GLI3 is a cytoplasmic activator of PTCH1 while disease-associated truncations produce a nuclear repressor established the bifunctional activator/repressor paradigm and linked it to Pallister–Hall and Greig syndromes.\",\n      \"evidence\": \"Immunofluorescence localization and PTCH1 promoter-reporter assays with disease-mimicking mutants\",\n      \"pmids\": [\"10077605\", \"10441342\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous processing mechanism unknown\", \"Proteasomal involvement not yet shown\", \"In vivo repressor function not demonstrated\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Genetic epistasis in Shh;Gli3 double-knockout mice and PHS-mimicking knock-in mice proved that Shh patterns the limb primarily by counteracting Gli3 repressor, and that truncated Gli3 is a constitutive repressor in vivo.\",\n      \"evidence\": \"Mouse compound knockout and targeted truncation mutation with skeletal phenotyping\",\n      \"pmids\": [\"12198547\", \"11978771\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical basis of processing not resolved\", \"Target genes of Gli3R in limb not identified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"ChIP demonstration that Gli3R directly occupies target promoters (Pax2, Sall1, cyclin D1, MYCN, Gli1) in the absence of Shh, and identification of MED12/CBP as coactivators recruited by Gli3A, defined the transcriptional mechanism at both ends of the activator-repressor switch.\",\n      \"evidence\": \"Chromatin immunoprecipitation in embryonic kidney; Co-IP and GST pulldown of GLI3-MED12 and GLI3-CBP with reporter assays\",\n      \"pmids\": [\"16396903\", \"17000779\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide binding profile not determined\", \"How Gli3R represses without HDACs not fully resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identification of the Sufu/GSK3β trimolecular complex that phosphorylates Gli3 to enable processing, and the finding that Shh dissociates this complex, provided a biochemical mechanism for pathway-regulated generation of Gli3R.\",\n      \"evidence\": \"Co-immunoprecipitation in wild-type and Sufu−/− MEFs with processing assays\",\n      \"pmids\": [\"19622347\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Exact phosphorylation sites for GSK3β on Gli3 not mapped in this study\", \"Role of PKA priming phosphorylation not integrated\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Reconstitution of proteasomal processing revealed a tripartite processing signal (zinc finger fold, low-complexity linker, degron) intrinsic to Gli3, explaining why Gli1 escapes processing despite sequence homology.\",\n      \"evidence\": \"In vitro proteasome processing assay with systematic domain deletion and mutagenesis\",\n      \"pmids\": [\"21921029\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of processing determinant not resolved\", \"E3 ligase(s) delivering Gli3 to the proteasome for processing not identified here\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Linking Gli3 processing in primary cilia to cortical progenitor cell cycle length (via cyclin D1 and Fgf15) extended the Gli3R paradigm beyond limb patterning to brain development, and revealed a non-canonical role for Gli3A in KRAS-induced autophagy via VMP1/p300.\",\n      \"evidence\": \"Conditional Kif3a/Gli3 KO with cell cycle kinetics; ChIP of GLI3 at VMP1 promoter with Co-IP of GLI3-p300\",\n      \"pmids\": [\"21976438\", \"22535956\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Hedgehog-independent regulation of GLI3A activity in autophagy not fully characterized\", \"Relative contributions of Gli3A vs. Gli3R in cortex not quantitatively resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Set7-mediated methylation at K436 and K595 was shown to stabilize Gli3A protein and enhance its DNA binding, revealing a post-translational activation mechanism that fine-tunes Gli3 activator output independently of processing.\",\n      \"evidence\": \"In vitro methylation assay, site-directed mutagenesis, cycloheximide chase, DNA-binding and reporter assays\",\n      \"pmids\": [\"27146893\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological contexts where Set7 regulates Gli3 not broadly mapped\", \"Interplay between methylation and other PTMs (phosphorylation, ubiquitination) not resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstration that PKA localizes to centrioles via Talpid3-PKARIIβ interaction and that Hh inhibits PKA-mediated Gli3 phosphorylation at cilia established the spatial logic of Gli3 processing regulation within the cilium.\",\n      \"evidence\": \"Co-IP of Talpid3-PKARIIβ, immunofluorescence localization, phosphorylation and processing assays in mutant cells\",\n      \"pmids\": [\"28673820\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct measurement of ciliary PKA activity changes upon Hh stimulation not shown\", \"Whether all PKA-dependent Gli3 phosphorylation occurs at cilia not established\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"ChIP identification of Cdk6 as a direct Gli3 target in cortical progenitors, with pharmacological rescue of the Gli3 mutant phenotype by Cdk6 inhibition, established a precise transcriptional mechanism linking Gli3 to cell cycle control in neurogenesis.\",\n      \"evidence\": \"Conditional KO, ChIP at Cdk6 locus, pharmacological Cdk6 inhibitor rescue\",\n      \"pmids\": [\"30093555\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Gli3A or Gli3R binds the Cdk6 promoter not definitively resolved\", \"Other direct cell cycle targets not comprehensively identified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of Wnt5a as a direct co-regulated target of Gli3A and Trps1 during chondrocyte hypertrophy, and of Gli3A as a driver of fetal Leydig cell identity, broadened the activator's known target repertoire and tissue contexts.\",\n      \"evidence\": \"ChIP of Gli3A and Trps1 at Wnt5a promoter with compound mutant validation; lentiviral GLI3A rescue in Gli3Xt/Xt testes\",\n      \"pmids\": [\"31550480\", \"32497091\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full Gli3A cistrome in these tissues not determined\", \"How Trps1 selectively binds Gli3A but not Gli3R structurally unexplained\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrating that SPOP-mediated ubiquitination degrades Gli3 and that cancer-driver SPOP mutations stabilize Gli3 to cooperate with androgen receptor revealed a pathological consequence of disrupted Gli3 turnover in prostate cancer.\",\n      \"evidence\": \"Co-IP of GLI3-AR, SPOP-dependent degradation assays with cancer mutants, xenograft tumor models\",\n      \"pmids\": [\"34610962\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Gli3A or both isoforms are SPOP substrates not fully clarified\", \"GLI3-AR co-target genes not comprehensively identified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Conditional knockout in satellite cells showed that Gli3R processed in primary cilia suppresses mTORC1 to maintain G0 dormancy, extending the Gli3 paradigm to adult stem cell quiescence regulation.\",\n      \"evidence\": \"Satellite cell-specific conditional Gli3 KO with mTORC1 immunoblotting, single-cell cycle analysis, regeneration assays\",\n      \"pmids\": [\"35803939\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets of Gli3R that suppress mTORC1 not identified\", \"Whether pharmacological Hh modulation can toggle satellite cell states via Gli3 not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A genome-wide map of Gli3A and Gli3R binding sites across tissues, the structural basis for proteasomal partial processing, and the integration of multiple post-translational inputs (PKA, GSK3β, Set7, SPOP, PP2A/MID1) into a quantitative model of Gli3 activator-repressor balance remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No genome-wide ChIP-seq across multiple tissues distinguishing Gli3A from Gli3R occupancy\", \"Structural mechanism of proteasomal partial processing not solved\", \"Quantitative integration of competing PTMs on Gli3 not modeled\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 9, 19, 25]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [3, 4, 8, 9, 11, 17, 23, 24, 25]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 14, 15]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 12]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [18, 21, 27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 5, 12, 21, 27]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [8, 9, 17, 23, 25]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 6, 15, 24]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [18, 23, 27]}\n    ],\n    \"complexes\": [\n      \"Gli3/Sufu/GSK3β processing complex\"\n    ],\n    \"partners\": [\n      \"SUFU\",\n      \"GSK3B\",\n      \"MED12\",\n      \"CREBBP\",\n      \"TRPS1\",\n      \"SPOP\",\n      \"AR\",\n      \"MID1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}