{"gene":"GADD45G","run_date":"2026-06-09T23:54:44","timeline":{"discoveries":[{"year":2002,"finding":"GADD45G (CR6) specifically interacts with the CDK1/CyclinB1 complex (but not other CDK/Cyclin complexes) both in vitro and in vivo, and inhibits CDK1/CyclinB1 kinase activity. Unlike GADD45A and GADD45B, GADD45G inhibits the kinase without disrupting the CDK1/CyclinB1 complex.","method":"In vitro binding assay, co-immunoprecipitation, kinase activity assay","journal":"Journal of cellular physiology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro kinase assays combined with in vivo co-IP, plus mechanistic distinction from paralogs; single lab but multiple orthogonal methods","pmids":["12124778"],"is_preprint":false},{"year":2001,"finding":"GADD45G mediates activation of p38 and JNK MAP kinase pathways downstream of TCR signaling in TH1 effector cells. GADD45G-deficient TH1 cells are severely defective in p38 and JNK activation, produce markedly less IFN-γ upon restimulation, and are deficient in activation-induced cell death (AICD). GADD45G-knockout mice also display reduced contact hypersensitivity.","method":"Genetic knockout mouse, kinase activity assays, cytokine measurement, in vivo hypersensitivity model","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO mouse with multiple defined cellular and biochemical phenotypes; in vivo and in vitro readouts","pmids":["11371360"],"is_preprint":false},{"year":2000,"finding":"GADD45G (CR6) interacts with PCNA via a domain shared with GADD45A and GADD45B, and also interacts with p21. Interaction of CR6 with PCNA impedes PCNA's function in negative growth control.","method":"Co-immunoprecipitation, domain mapping, functional growth assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — reciprocal co-IP with domain mapping and functional consequence established; single lab","pmids":["11022036"],"is_preprint":false},{"year":2004,"finding":"GADD45G and GADD45B act through MEKK4 (MAP3K4) to activate p38 and promote IFN-γ production in CD4+ T cells. Expression of GADD45G promotes IFN-γ production in MEKK4+/+ but not MEKK4−/− cells, and this pathway is independent of STAT4.","method":"MEKK4 knockout mouse, T-cell stimulation assays, cytokine measurement, epistasis analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis using KO mice, with multiple readouts; replicates and extends the GADD45G/p38/IFN-γ axis finding","pmids":["15044949"],"is_preprint":false},{"year":2008,"finding":"Crystal structure of GADD45G reveals an αβα sandwich fold with a central five-stranded mixed β-sheet. GADD45G forms dimers through a four-helix bundle interface involving the most conserved residues. Point mutants that disrupt dimerization while preserving tertiary structure abolish growth inhibition, demonstrating that dimerization is essential for GADD45G's growth-inhibitory function.","method":"X-ray crystallography, site-directed mutagenesis, cell-based growth assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with mutagenesis and functional validation in cells; multiple orthogonal methods in a single rigorous study","pmids":["18445651"],"is_preprint":false},{"year":2003,"finding":"CR6-interacting factor 1 (CRIF1) directly binds GADD45G (and other GADD45 family members), colocalizes with GADD45G in the nucleus, and additively inhibits CDK1/CyclinB1 kinase activity together with GADD45G.","method":"GST pull-down, mammalian two-hybrid, co-immunoprecipitation, histone H1 kinase assay, siRNA knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal binding assays (GST pulldown, two-hybrid, co-IP) plus functional kinase assay; single lab","pmids":["12716909"],"is_preprint":false},{"year":2012,"finding":"GADD45G is required for male sex determination in mice. Gadd45g-null XY mice exhibit complete gonadal sex reversal due to failure to achieve the Sry expression threshold. GADD45G functions upstream of p38 MAPK, and p38 MAPK activation is required for phosphorylation of GATA4, which in turn binds the Sry promoter to drive Sry expression. A signaling cascade GADD45G → p38 MAPK → GATA4 → SRY was established.","method":"Knockout mouse model, in situ hybridization, ChIP, p38 MAPK phosphorylation assays, genetic rescue (MAP3K4 transgene)","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent KO studies with overlapping mechanistic conclusions, genetic rescue, ChIP, and phosphorylation readouts; independently replicated across labs","pmids":["23102580","23102581"],"is_preprint":false},{"year":2013,"finding":"Gadd45g-deficient XY mice on a pure C57BL/6 background display complete sex reversal to female phenotype, confirming a specific (not redundant) role for Gadd45g in male sex determination through control of Sry expression. Gadd45a and Gadd45b deletions do not affect sex determination.","method":"Knockout mouse, phenotypic analysis, RT-PCR for Sry expression","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — definitive KO phenotype with paralog-specific controls; independently replicates two Developmental Cell papers","pmids":["23516551"],"is_preprint":false},{"year":2014,"finding":"GADD45G is a cold-induced activator of UCP1 and oxidative capacity in brown adipose tissue (BAT). GADD45G works by activating p38 MAPK, which potentiates ERRβ and ERRγ transcriptional function independently of PGC-1 coactivators, yet synergizes with PGC-1α to induce the thermogenic program. Gadd45g-knockout mice have defects in Ucp1 induction and thermogenic response to cold.","method":"Knockout mouse, genome-wide cDNA screen, cold-exposure assays, MAPK activity assays, ERR transcriptional reporter assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — KO mouse with physiological readouts, genome-wide screen, and mechanistic pathway dissection; single lab but multiple orthogonal approaches","pmids":["25071184"],"is_preprint":false},{"year":2014,"finding":"GADD45G instructs differentiation of long-term repopulating hematopoietic stem cells (LT-HSCs) by specifically activating MAP3K4-mediated MAPK p38 signaling. Overexpression induces and accelerates differentiation, while absence of GADD45G enhances self-renewal. Single-cell videomicroscopy showed GADD45G expression leads to lineage commitment within 36 hours with a selective reduction in megakaryocytic-erythroid progeny.","method":"Single-cell videomicroscopy tracking, genetic overexpression and knockout, MAPK activity assays","journal":"Stem cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — single-cell level tracking combined with loss- and gain-of-function and biochemical pathway analysis; single lab","pmids":["25068120"],"is_preprint":false},{"year":2015,"finding":"Gadd45γ overexpression in cardiomyocytes induces apoptosis, fibrosis, and left ventricular dysfunction, while genetic deletion confers resistance to ischemic injury. Mechanistically, Gadd45γ activates receptor-interacting protein 1 (RIP1) and caspase-8 in a p38 MAPK-dependent manner to promote cardiomyocyte death.","method":"Adeno-associated viral vector overexpression in vivo, knockout mouse, myocardial infarction model, Western blot for RIP1 and caspase-8 activation, p38 inhibitor experiments","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — both gain- and loss-of-function in vivo with mechanistic dissection of RIP1/caspase-8/p38 pathway; single lab but multiple complementary approaches","pmids":["26370247"],"is_preprint":false},{"year":2013,"finding":"SIRT1 activation reduces binding of NF-κB/STAT3 complexes to the GADD45G promoter, leading to transcriptional upregulation of GADD45G. EMSA revealed that NF-κB binds directly to the GADD45G promoter while STAT3 binds indirectly in complex with NF-κB, functioning as a co-repressor.","method":"ChIP assay, EMSA, siRNA knockdown, promoter reporter assay","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA and ChIP provide direct evidence of transcription factor binding; multiple methods but single lab","pmids":["23681230"],"is_preprint":false},{"year":2000,"finding":"Gadd45gamma gene expression is regulated transcriptionally by C/EBPβ and C/EBPδ binding to a non-canonical C/EBP-binding site in its promoter. This was identified as a mechanism by which IL-6 induces GADD45G expression during M1 cell differentiation.","method":"EMSA, reporter gene analysis, promoter cloning, expression correlation during differentiation","journal":"European journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — EMSA and reporter assay directly demonstrate transcription factor binding and promoter activity; single lab","pmids":["11012671"],"is_preprint":false},{"year":2001,"finding":"IL-2-induced expression of Gadd45gamma in peripheral T cells is dependent on signaling through the tyrosine kinase JAK3 and transcription factors STAT5a and STAT5b. Gadd45gamma-deficient mice develop normally with intact hematopoiesis, and Gadd45gamma-deficient T lymphocytes show normal responses to IL-2, indicating dispensability for T cell proliferation under normal conditions.","method":"Knockout mouse, genetic pathway analysis (JAK3/STAT5 signaling), T-cell proliferation and hematopoiesis assays","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with pathway analysis; upstream regulator identified; single lab","pmids":["11287618"],"is_preprint":false},{"year":2010,"finding":"GADD45G is directly transcriptionally induced by the basic helix-loop-helix transcription factor Ascl1 during neuronal differentiation. Two E-box consensus sites in the Gadd45gamma promoter are required for Ascl1 regulation, and Ascl1 binding to these sites was confirmed by ChIP. Overexpression of GADD45G alone is sufficient to initiate some aspects of neuronal differentiation independent of Ascl1.","method":"Microarray, real-time PCR, chromatin immunoprecipitation (ChIP), transactivation reporter assay, gain-of-function overexpression","journal":"Molecular and cellular neurosciences","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP confirming in vivo Ascl1 binding plus mutagenesis of E-boxes plus functional overexpression; multiple orthogonal methods in single study","pmids":["20382226"],"is_preprint":false},{"year":2008,"finding":"GADD45G overexpression in Hep-G2 hepatoma cells activates both the p38 and JNK kinase pathways to induce G2/M arrest.","method":"Transient transfection, flow cytometry, kinase activity assays","journal":"Molecular biology reports","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — gain-of-function with defined pathway readouts; single lab, two cell line experiments","pmids":["19048389"],"is_preprint":false},{"year":2013,"finding":"GADD45G regulates dental epithelial cell proliferation through p38 MAPK-mediated upregulation of p21. Gadd45g is expressed in enamel knots, and its overexpression inhibits dental epithelial cell proliferation via the p38 MAPK/p21 axis.","method":"Expression analysis, overexpression experiments, Western blot/flow cytometry for p21 and p38, p38 inhibitor treatment","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — gain-of-function with biochemical pathway dissection; single lab","pmids":["23751077"],"is_preprint":false},{"year":2015,"finding":"GADD45G induces cellular senescence in liver tumor cells through transcriptional activation of SIP1 (Smad-interacting protein-1). JNK (but not p38) MAPK activation is required for GADD45G-mediated SIP1 upregulation, and SIP1 knockdown abrogates the senescence and growth-suppressive effects of GADD45G in vivo.","method":"Gain-of-function overexpression, siRNA knockdown, xenograft tumor model, JNK inhibitor treatment, gene expression analysis","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo xenograft rescue plus pharmacological inhibition; single lab","pmids":["26378039"],"is_preprint":false},{"year":2019,"finding":"GADD45G interacts directly with E-cadherin (confirmed by GST pull-down and co-immunoprecipitation), enhances E-cadherin membrane localization, and suppresses migration and invasion of esophageal squamous cell carcinoma cells. The dimer-dissociating mutant of GADD45G cannot interact with E-cadherin and loses its ability to suppress migration/invasion, linking dimerization to this function.","method":"GST pull-down, co-immunoprecipitation, subcellular fractionation, Transwell migration/invasion assay, loss- and gain-of-function","journal":"Digestive diseases and sciences","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — direct binding confirmed by two methods, functional consequence and dimerization-dependence established; single lab","pmids":["31562612"],"is_preprint":false},{"year":2019,"finding":"GADD45G reduction in the hippocampus impairs MAPK pathway activity (p38 and JNK) and disrupts activation of downstream targets ATF-2, c-Jun, and CREB, leading to age-like memory deficits in mice. GADD45G is required for induction of key early- and late-response genes associated with aging.","method":"Genetic knockdown in mouse hippocampus, behavioral memory tasks, kinase activity assays, gene expression analysis","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function with defined biochemical (p38/JNK/CREB) and behavioral readouts; single lab","pmids":["31826946"],"is_preprint":false},{"year":2022,"finding":"GADD45G/p38 MAPK/CDC25B signaling promotes neurite outgrowth in human neurons by facilitating microtubule polymerization through dephosphorylation of phosphorylated CRMP2 (which promotes microtubule assembly). GADD45G is highly expressed in developing human cerebral specimens.","method":"In vitro neuronal differentiation, GADD45G knockdown/overexpression, p38 inhibitor, CDC25B manipulation, microtubule polymerization assay, CRMP2 phosphorylation Western blot","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple pathway components interrogated with biochemical and cellular readouts; single lab","pmids":["35497000"],"is_preprint":false},{"year":2022,"finding":"Gadd45g mediates metformin-induced neuronal differentiation of neural stem cells (NSCs) via DNA demethylation. Gadd45g increases demethylation of the NeuroD1 promoter by regulating passive and active DNA demethylation enzymes through an AMPK-independent mechanism. Genetic deficiency of Gadd45g decreases hippocampal neurogenesis and leads to spatial memory decline and depression-like behaviors in mice.","method":"Knockout mouse, lentiviral overexpression in NSCs, bisulfite sequencing, neurogenic differentiation assays, behavioral testing","journal":"Stem cells (Dayton, Ohio)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse phenotype combined with mechanistic demethylation assay; single lab","pmids":["35511865"],"is_preprint":false},{"year":2024,"finding":"GADD45G insufficiency in the hematopoietic system leads to enhanced growth and self-renewal of myeloid-biased hematopoietic stem cells and MPN-like phenotypes. Mechanistically, GADD45G deficiency acts through sequential activation of RAC2, PAK1, and PI3K-AKT signaling pathways.","method":"Knockout/knockdown mouse model, hematopoietic stem cell assays, pathway inhibitor experiments, signaling assays","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo murine model with defined RAC2/PAK1/PI3K-AKT pathway cascade; single lab","pmids":["38582902"],"is_preprint":false},{"year":2021,"finding":"GADD45G upregulation in AML cells impairs homologous recombination DNA repair, leading to DNA damage accumulation, apoptosis, differentiation, and growth arrest. GADD45G is epigenetically silenced by histone deacetylation in AML, and its expression is further downregulated by oncogenes FLT3-ITD and MLL-AF9.","method":"Gain-of-function overexpression, DNA repair assay (HR assay), apoptosis/differentiation assays, ChIP for histone acetylation, cell line and patient sample analysis","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct HR assay plus epigenetic mechanism established; single lab, multiple methods","pmids":["33945602"],"is_preprint":false},{"year":2012,"finding":"GADD45G regulates TNF-α and IL-6 production in LPS-stimulated THP-1 monocyte cells through JNK activation. Knockdown of GADD45G reduces TNF-α protein by 75% and IL-6 by 60%; overexpression increases TNF-α six-fold and IL-6 eighty-fold. JNK inhibition reduces the pro-inflammatory effects of GADD45G.","method":"Lentiviral shRNA knockdown, overexpression, ELISA for cytokines, JNK inhibitor (SP600125)","journal":"Inflammation research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — bidirectional regulation (KD and OE) with pharmacological pathway validation; single lab","pmids":["22752116"],"is_preprint":false},{"year":2008,"finding":"GADD45G is rapidly and strongly upregulated in renal tubular cells following ureteral obstruction. Adenovirus-mediated GADD45G expression in cultured renal tubular cells activates p38 MAPK and upregulates chemokine ligands and fibrosis-related factors including TGF-β1, matrix metalloproteinases, decorin, and BMP2. Silencing GADD45G blunts inflammatory and fibrogenic mediators and monocyte infiltration in obstructed rat kidney.","method":"Differential display, adenoviral overexpression, siRNA knockdown, rat ureteral obstruction model, cytokine/chemokine expression assays","journal":"Kidney international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function in vivo and in vitro with multiple pathway readouts; single lab","pmids":["18354378"],"is_preprint":false},{"year":1999,"finding":"CR6/GADD45G suppresses colony formation of human lung carcinoma H1299 cells, establishing its function in negative growth control. CR6 is the murine homologue of human CR6 (GADD45G), with 97% amino acid identity, confirming evolutionary conservation.","method":"Colony formation assay, cDNA cloning, sequence analysis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — colony formation functional assay replicated across multiple GADD45 family members; single lab","pmids":["10490824"],"is_preprint":false},{"year":2001,"finding":"Ectopic expression of CR6/GADD45G causes G1 phase accumulation and retardation of cellular proliferation in the absence of genotoxic stress, and sensitizes M1 myeloblastic leukemia and H1299 lung carcinoma cells to apoptosis induced by UV, MMS, γ-irradiation, and VP16. In the absence of stress, GADD45G expression does not activate the MTK1/JNK/p38 stress cascade.","method":"Inducible expression system (IPTG), flow cytometry, apoptosis assays, kinase activity measurement","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — inducible expression in two cell lines, with multiple genotoxic stresses and kinase assays; single lab","pmids":["11251170"],"is_preprint":false},{"year":2014,"finding":"miR-383 directly targets the 3'-UTR of GADD45G mRNA, reducing its expression. Forced expression of miR-383 decreased Gadd45g protein levels and increased cellular sensitivity to DNA damage in breast cancer cells; this was rescued by ectopic GADD45G without the 3'-UTR. miR-383 also negatively regulates Gadd45g to modulate embryonic stem cell differentiation.","method":"miRNA overexpression/inhibition, 3'-UTR luciferase reporter assay, Western blot, rescue experiment","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — direct 3'-UTR binding demonstrated by reporter and rescue; single lab","pmids":["25415264"],"is_preprint":false},{"year":2021,"finding":"Gadd45g activates MAPK signaling during mouse ESC differentiation by increasing expression of positive modulators of the MAPK pathway (Csf1r, Igf2, Fgfr3), and this differentiation effect is abolished by MEK inhibition. Additionally, GADD45G overexpression inhibits breast cancer cell invasion and metastasis in vivo.","method":"ESC differentiation assays, MEK inhibitor treatment, gene expression analysis, xenograft metastasis model","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — pharmacological pathway validation plus in vivo metastasis model; single lab","pmids":["34601500"],"is_preprint":false}],"current_model":"GADD45G is a small nuclear stress-response protein that functions as a tumor suppressor and signaling scaffold: it directly inhibits CDK1/CyclinB1 kinase activity (without disrupting the complex), interacts with PCNA and p21 to impede DNA replication-coupled growth control, and promotes activation of p38 MAPK and JNK (via MAP3K4/MEKK4) to regulate IFN-γ production in TH1 cells, sex determination (through GATA4→SRY), brown adipose thermogenesis (via p38→ERRγ), hematopoietic stem cell differentiation, cardiomyocyte apoptosis (via RIP1/caspase-8), and neuronal differentiation and neurite outgrowth (via p38/CDC25B/CRMP2); its dimer structure—essential for function—is resolved crystallographically, and its expression is tightly regulated by transcription factors (C/EBPβ/δ, Ascl1, NF-κB/STAT3) and epigenetic silencing (promoter methylation, histone deacetylation) that are frequently dysregulated in cancer."},"narrative":{"mechanistic_narrative":"GADD45G (CR6) is a small nuclear stress-response protein and tumor suppressor that couples cell-cycle and growth control to stress-activated MAP kinase signaling [PMID:12124778, PMID:10490824]. It exerts direct growth control by specifically binding the CDK1/CyclinB1 complex and inhibiting its kinase activity without disrupting the complex—a mechanistic distinction from its paralogs—and by interacting with PCNA and p21 to impede PCNA-dependent negative growth control [PMID:12124778, PMID:11022036]; these activities translate into colony-formation suppression, cell-cycle arrest, and sensitization to genotoxic stress [PMID:10490824, PMID:11251170]. A second, dominant arm of GADD45G function is activation of the p38 and JNK MAP kinase cascades through the upstream kinase MEKK4 (MAP3K4) [PMID:15044949, PMID:25068120]. This MAPK axis is the common mechanistic thread linking GADD45G to a broad set of physiological outcomes: it drives IFN-γ production and activation-induced cell death in TH1/CD4+ T cells [PMID:11371360, PMID:15044949]; specifies male sex determination via a GADD45G→p38→GATA4→SRY cascade [PMID:23102580, PMID:23102581, PMID:23516551]; activates the brown-adipose thermogenic program by potentiating ERRβ/γ transcription [PMID:25071184]; instructs hematopoietic stem cell differentiation [PMID:25068120]; promotes p38-dependent RIP1/caspase-8 cardiomyocyte apoptosis [PMID:26370247]; and supports neuronal differentiation, neurite outgrowth via a p38/CDC25B/CRMP2 module, and hippocampal memory through p38/JNK→ATF-2/c-Jun/CREB signaling [PMID:31826946, PMID:35497000]. The function of GADD45G depends on dimerization through a four-helix-bundle interface defined by its αβα-sandwich crystal structure, since dimer-disrupting mutants abolish growth inhibition and abolish its interaction with E-cadherin in tumor-suppressive contexts [PMID:18445651, PMID:31562612]. GADD45G expression is tightly controlled transcriptionally by C/EBPβ/δ, Ascl1, JAK3/STAT5, and NF-κB/STAT3, and is silenced epigenetically and post-transcriptionally (histone deacetylation, miR-383) in cancers including AML, where its loss impairs homologous-recombination DNA repair control [PMID:11012671, PMID:20382226, PMID:23681230, PMID:33945602, PMID:25415264].","teleology":[{"year":1999,"claim":"Established that GADD45G has intrinsic growth-suppressive activity, framing it as a candidate tumor suppressor rather than merely a stress marker.","evidence":"Colony formation assay in H1299 lung carcinoma and cDNA cloning of the conserved murine homolog","pmids":["10490824"],"confidence":"Medium","gaps":["Did not identify the molecular target mediating growth suppression","No mechanism for how growth arrest is enforced"]},{"year":2001,"claim":"Defined the first physiological loss-of-function role: GADD45G is required for p38/JNK activation and IFN-γ production in TH1 cells, linking it to stress-MAPK signaling and immune effector function.","evidence":"Gadd45g knockout mouse with TH1 kinase, cytokine, and contact-hypersensitivity readouts","pmids":["11371360"],"confidence":"High","gaps":["Upstream kinase connecting TCR signaling to GADD45G not defined here","Direct molecular target of GADD45G in MAPK activation not identified"]},{"year":2000,"claim":"Identified the direct molecular partners (PCNA, p21) and CDK1/CyclinB1 underlying growth control, showing GADD45G inhibits CDK1 kinase without complex dissociation—distinguishing it mechanistically from paralogs.","evidence":"Co-IP, domain mapping, in vitro/in vivo binding and kinase activity assays","pmids":["11022036","12124778"],"confidence":"High","gaps":["Structural basis of selective CDK1/CyclinB1 inhibition not resolved at this stage","Whether PCNA and CDK1 binding are concurrent or mutually exclusive unclear"]},{"year":2003,"claim":"Showed GADD45G acts as a scaffold by recruiting CRIF1, which co-localizes in the nucleus and additively inhibits CDK1/CyclinB1, indicating cooperative rather than solo growth control.","evidence":"GST pull-down, mammalian two-hybrid, co-IP, histone H1 kinase assay, siRNA","pmids":["12716909"],"confidence":"High","gaps":["Stoichiometry of the GADD45G–CRIF1–CDK1 assembly unknown","Whether CRIF1 modulates the MAPK arm of GADD45G untested"]},{"year":2004,"claim":"Placed MEKK4 (MAP3K4) as the upstream kinase through which GADD45G activates p38, providing the missing mechanistic link between GADD45G and the stress-MAPK cascade.","evidence":"MEKK4 knockout mouse, T-cell stimulation, cytokine measurement, genetic epistasis","pmids":["15044949"],"confidence":"High","gaps":["Whether GADD45G binds MAP3K4 directly to relieve autoinhibition not shown structurally here","STAT4-independence defined but full transcriptional output not mapped"]},{"year":2008,"claim":"Resolved the GADD45G structure and proved dimerization through a four-helix-bundle interface is essential for growth-inhibitory function, providing a structural prerequisite for activity.","evidence":"X-ray crystallography, dimer-disrupting mutagenesis, cell-based growth assays","pmids":["18445651"],"confidence":"High","gaps":["Structure of GADD45G bound to CDK1/CyclinB1 or MAP3K4 not determined","How dimerization mechanically activates downstream kinases unresolved"]},{"year":2012,"claim":"Demonstrated a non-redundant developmental role: GADD45G drives male sex determination through a GADD45G→p38→GATA4→SRY cascade, achieving the Sry expression threshold.","evidence":"Knockout mice, in situ hybridization, ChIP of GATA4 on Sry promoter, p38 phosphorylation, MAP3K4 transgene rescue","pmids":["23102580","23102581"],"confidence":"High","gaps":["What triggers GADD45G expression in the bipotential gonad not defined","Direct biochemical link from GADD45G to p38 in gonadal cells inferred from genetics"]},{"year":2013,"claim":"Confirmed strain-independent, paralog-specific requirement of GADD45G for sex determination, ruling out compensation by GADD45A/B.","evidence":"Knockout mice on pure C57BL/6 background, phenotyping, Sry RT-PCR","pmids":["23516551"],"confidence":"High","gaps":["Does not address species generalizability beyond mouse","Threshold mechanism of Sry control not quantified"]},{"year":2014,"claim":"Extended the GADD45G→p38 axis to metabolism, stem-cell fate, and cell death, showing it potentiates ERRβ/γ thermogenesis in brown fat, instructs HSC differentiation via MAP3K4/p38, and drives cardiomyocyte apoptosis via RIP1/caspase-8.","evidence":"Knockout mice, cold-exposure assays, ERR reporters, single-cell videomicroscopy, AAV overexpression, MI model, p38 inhibition","pmids":["25071184","25068120","26370247"],"confidence":"High","gaps":["How the same p38 output is channeled into divergent fates (thermogenesis vs apoptosis vs differentiation) unexplained","Cell-type-specific cofactors directing outcome unknown"]},{"year":2010,"claim":"Identified upstream transcriptional regulators (Ascl1, C/EBPβ/δ, JAK3/STAT5), establishing how lineage and cytokine signals induce GADD45G to couple to its effector programs.","evidence":"ChIP, E-box and C/EBP-site promoter mutagenesis, reporter assays, knockout mice","pmids":["20382226","11012671","11287618"],"confidence":"High","gaps":["Combinatorial logic among these inputs in any single cell type not integrated","Quantitative contribution of each factor to baseline vs induced expression unclear"]},{"year":2013,"claim":"Mapped repressive transcriptional control of GADD45G, showing SIRT1-regulated NF-κB/STAT3 complexes occupy the promoter as co-repressors, linking GADD45G silencing to oncogenic signaling.","evidence":"ChIP, EMSA, siRNA, promoter reporter assays","pmids":["23681230"],"confidence":"Medium","gaps":["Single-lab; physiological context of SIRT1-driven derepression not validated in vivo","Direct vs indirect STAT3 binding inferred from EMSA only"]},{"year":2015,"claim":"Diversified tumor-suppressive output, showing GADD45G induces JNK-dependent SIP1-mediated senescence in liver tumors and p38/p21-mediated proliferation control in dental epithelium.","evidence":"Overexpression, siRNA, xenograft rescue, JNK/p38 inhibitors, gene expression","pmids":["26378039","23751077"],"confidence":"Medium","gaps":["Why JNK vs p38 dominates in different tissues not mechanistically resolved","Single-lab findings per tissue"]},{"year":2019,"claim":"Established GADD45G as a direct E-cadherin partner that suppresses tumor invasion in a dimerization-dependent manner, and showed it sustains hippocampal MAPK→ATF-2/c-Jun/CREB signaling for memory.","evidence":"GST pull-down, co-IP, fractionation, Transwell assays, dimer mutant; hippocampal knockdown with behavioral and kinase readouts","pmids":["31562612","31826946"],"confidence":"Medium","gaps":["How a nuclear MAPK activator promotes E-cadherin membrane localization unresolved","Both single-lab; reciprocal in vivo validation limited"]},{"year":2021,"claim":"Connected GADD45G loss to AML through impaired HR DNA repair and epigenetic silencing, and showed GADD45G activates MAPK during ESC differentiation while suppressing breast cancer metastasis.","evidence":"HR repair assay, ChIP for histone acetylation, patient samples, ESC differentiation with MEK inhibition, xenograft metastasis","pmids":["33945602","34601500"],"confidence":"Medium","gaps":["Direct biochemical mechanism by which GADD45G modulates HR not defined","Single-lab per disease context"]},{"year":2022,"claim":"Defined two further neurogenic mechanisms—p38/CDC25B/CRMP2-driven microtubule polymerization for neurite outgrowth and DNA-demethylation-driven NeuroD1 activation for metformin-induced neurogenesis.","evidence":"Neuronal differentiation, p38 inhibitor, CDC25B manipulation, microtubule and CRMP2 phosphorylation assays; knockout mice, bisulfite sequencing, behavior","pmids":["35497000","35511865"],"confidence":"Medium","gaps":["How GADD45G engages DNA-demethylation enzymes mechanistically unresolved","Single-lab; integration with the MAPK arm unclear"]},{"year":2024,"claim":"Showed GADD45G insufficiency drives myeloid-biased HSC self-renewal and MPN-like disease via RAC2→PAK1→PI3K-AKT signaling, extending its tumor-suppressive role to a defined oncogenic cascade.","evidence":"Knockout/knockdown mice, HSC assays, pathway inhibitor experiments","pmids":["38582902"],"confidence":"Medium","gaps":["Whether GADD45G directly restrains RAC2 or acts indirectly not resolved","Single-lab"]},{"year":null,"claim":"It remains unresolved how a single dimeric GADD45G protein selectively channels its shared p38/JNK output into context-specific fates (differentiation, thermogenesis, senescence, apoptosis) and whether direct GADD45G–MAP3K4 binding mechanistically links its structure to kinase activation.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of GADD45G bound to MAP3K4 or CDK1/CyclinB1","Cell-type cofactors 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neuronal lineage in the developing mammalian brain.","date":"2014","source":"Development, growth & differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/24712911","citation_count":16,"is_preprint":false},{"pmid":"35511865","id":"PMC_35511865","title":"Gadd45g, A Novel Antidepressant Target, Mediates Metformin-Induced Neuronal Differentiation of Neural Stem Cells Via DNA Demethylation.","date":"2022","source":"Stem cells (Dayton, Ohio)","url":"https://pubmed.ncbi.nlm.nih.gov/35511865","citation_count":16,"is_preprint":false},{"pmid":"26378039","id":"PMC_26378039","title":"SIP1 is a downstream effector of GADD45G in senescence induction and growth inhibition of liver tumor cells.","date":"2015","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/26378039","citation_count":16,"is_preprint":false},{"pmid":"32828305","id":"PMC_32828305","title":"MicroRNA-128-1-5p attenuates myocardial ischemia/reperfusion injury by suppressing Gadd45g-mediated apoptotic 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[et al.]","url":"https://pubmed.ncbi.nlm.nih.gov/22752116","citation_count":11,"is_preprint":false},{"pmid":"38582902","id":"PMC_38582902","title":"Gadd45g insufficiency drives the pathogenesis of myeloproliferative neoplasms.","date":"2024","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/38582902","citation_count":10,"is_preprint":false},{"pmid":"25245461","id":"PMC_25245461","title":"GADD45γ induces G2/M arrest in human pharynx and nasopharyngeal carcinoma cells by cucurbitacin E.","date":"2014","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/25245461","citation_count":10,"is_preprint":false},{"pmid":"21315755","id":"PMC_21315755","title":"Carcinogenic heavy metals, As3+ and Cr6+, increase affinity of nuclear mono-ubiquitinated annexin A1 for DNA containing 8-oxo-guanosine, and promote translesion DNA synthesis.","date":"2011","source":"Toxicology and applied pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/21315755","citation_count":10,"is_preprint":false},{"pmid":"32711258","id":"PMC_32711258","title":"Modeling human age-associated increase in Gadd45γ expression leads to spatial recognition memory impairments in young adult mice.","date":"2020","source":"Neurobiology of aging","url":"https://pubmed.ncbi.nlm.nih.gov/32711258","citation_count":9,"is_preprint":false},{"pmid":"25997448","id":"PMC_25997448","title":"Nuclear lymphocyte-specific protein tyrosine kinase and its interaction with CR6-interacting factor 1 promote the survival of human leukemic T cells.","date":"2015","source":"Oncology reports","url":"https://pubmed.ncbi.nlm.nih.gov/25997448","citation_count":9,"is_preprint":false},{"pmid":"32138671","id":"PMC_32138671","title":"Novel myocardial markers GADD45G and NDUFS5 identified by RNA-sequencing predicts left ventricular reverse remodeling in advanced non-ischemic heart failure: a retrospective cohort study.","date":"2020","source":"BMC cardiovascular disorders","url":"https://pubmed.ncbi.nlm.nih.gov/32138671","citation_count":9,"is_preprint":false},{"pmid":"19293565","id":"PMC_19293565","title":"Urinary GADD45gamma expression is associated with progression of lgA nephropathy.","date":"2009","source":"American journal of nephrology","url":"https://pubmed.ncbi.nlm.nih.gov/19293565","citation_count":9,"is_preprint":false},{"pmid":"18671277","id":"PMC_18671277","title":"Fine temporal analysis of DHT transcriptional modulation of the ATM/Gadd45g signaling pathways in the mouse uterus.","date":"2009","source":"Molecular reproduction and development","url":"https://pubmed.ncbi.nlm.nih.gov/18671277","citation_count":9,"is_preprint":false},{"pmid":"19710206","id":"PMC_19710206","title":"Cytoprotection against Cr(6+)-induced DNA damage by alpha-lipoic acid: implications in reducing occupational cancer risk.","date":"2009","source":"Mutagenesis","url":"https://pubmed.ncbi.nlm.nih.gov/19710206","citation_count":9,"is_preprint":false},{"pmid":"35497000","id":"PMC_35497000","title":"The GADD45G/p38 MAPK/CDC25B signaling pathway enhances neurite outgrowth by promoting microtubule polymerization.","date":"2022","source":"iScience","url":"https://pubmed.ncbi.nlm.nih.gov/35497000","citation_count":8,"is_preprint":false},{"pmid":"35166061","id":"PMC_35166061","title":"B Cell-Specific Deletion of CR6-Interacting Factor 1 Drives Lupus-like Autoimmunity by Activation of Interleukin-17, Interleukin-6, and Pathogenic Follicular Helper T Cells in a Mouse Model.","date":"2022","source":"Arthritis & rheumatology (Hoboken, N.J.)","url":"https://pubmed.ncbi.nlm.nih.gov/35166061","citation_count":8,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50431,"output_tokens":7298,"usd":0.130382,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16542,"output_tokens":5387,"usd":0.108692,"stage2_stop_reason":"end_turn"},"total_usd":0.239074,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"GADD45G (CR6) specifically interacts with the CDK1/CyclinB1 complex (but not other CDK/Cyclin complexes) both in vitro and in vivo, and inhibits CDK1/CyclinB1 kinase activity. Unlike GADD45A and GADD45B, GADD45G inhibits the kinase without disrupting the CDK1/CyclinB1 complex.\",\n      \"method\": \"In vitro binding assay, co-immunoprecipitation, kinase activity assay\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro kinase assays combined with in vivo co-IP, plus mechanistic distinction from paralogs; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"12124778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"GADD45G mediates activation of p38 and JNK MAP kinase pathways downstream of TCR signaling in TH1 effector cells. GADD45G-deficient TH1 cells are severely defective in p38 and JNK activation, produce markedly less IFN-γ upon restimulation, and are deficient in activation-induced cell death (AICD). GADD45G-knockout mice also display reduced contact hypersensitivity.\",\n      \"method\": \"Genetic knockout mouse, kinase activity assays, cytokine measurement, in vivo hypersensitivity model\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO mouse with multiple defined cellular and biochemical phenotypes; in vivo and in vitro readouts\",\n      \"pmids\": [\"11371360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"GADD45G (CR6) interacts with PCNA via a domain shared with GADD45A and GADD45B, and also interacts with p21. Interaction of CR6 with PCNA impedes PCNA's function in negative growth control.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, functional growth assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — reciprocal co-IP with domain mapping and functional consequence established; single lab\",\n      \"pmids\": [\"11022036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"GADD45G and GADD45B act through MEKK4 (MAP3K4) to activate p38 and promote IFN-γ production in CD4+ T cells. Expression of GADD45G promotes IFN-γ production in MEKK4+/+ but not MEKK4−/− cells, and this pathway is independent of STAT4.\",\n      \"method\": \"MEKK4 knockout mouse, T-cell stimulation assays, cytokine measurement, epistasis analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis using KO mice, with multiple readouts; replicates and extends the GADD45G/p38/IFN-γ axis finding\",\n      \"pmids\": [\"15044949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Crystal structure of GADD45G reveals an αβα sandwich fold with a central five-stranded mixed β-sheet. GADD45G forms dimers through a four-helix bundle interface involving the most conserved residues. Point mutants that disrupt dimerization while preserving tertiary structure abolish growth inhibition, demonstrating that dimerization is essential for GADD45G's growth-inhibitory function.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, cell-based growth assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with mutagenesis and functional validation in cells; multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"18445651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CR6-interacting factor 1 (CRIF1) directly binds GADD45G (and other GADD45 family members), colocalizes with GADD45G in the nucleus, and additively inhibits CDK1/CyclinB1 kinase activity together with GADD45G.\",\n      \"method\": \"GST pull-down, mammalian two-hybrid, co-immunoprecipitation, histone H1 kinase assay, siRNA knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal binding assays (GST pulldown, two-hybrid, co-IP) plus functional kinase assay; single lab\",\n      \"pmids\": [\"12716909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GADD45G is required for male sex determination in mice. Gadd45g-null XY mice exhibit complete gonadal sex reversal due to failure to achieve the Sry expression threshold. GADD45G functions upstream of p38 MAPK, and p38 MAPK activation is required for phosphorylation of GATA4, which in turn binds the Sry promoter to drive Sry expression. A signaling cascade GADD45G → p38 MAPK → GATA4 → SRY was established.\",\n      \"method\": \"Knockout mouse model, in situ hybridization, ChIP, p38 MAPK phosphorylation assays, genetic rescue (MAP3K4 transgene)\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent KO studies with overlapping mechanistic conclusions, genetic rescue, ChIP, and phosphorylation readouts; independently replicated across labs\",\n      \"pmids\": [\"23102580\", \"23102581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Gadd45g-deficient XY mice on a pure C57BL/6 background display complete sex reversal to female phenotype, confirming a specific (not redundant) role for Gadd45g in male sex determination through control of Sry expression. Gadd45a and Gadd45b deletions do not affect sex determination.\",\n      \"method\": \"Knockout mouse, phenotypic analysis, RT-PCR for Sry expression\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — definitive KO phenotype with paralog-specific controls; independently replicates two Developmental Cell papers\",\n      \"pmids\": [\"23516551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"GADD45G is a cold-induced activator of UCP1 and oxidative capacity in brown adipose tissue (BAT). GADD45G works by activating p38 MAPK, which potentiates ERRβ and ERRγ transcriptional function independently of PGC-1 coactivators, yet synergizes with PGC-1α to induce the thermogenic program. Gadd45g-knockout mice have defects in Ucp1 induction and thermogenic response to cold.\",\n      \"method\": \"Knockout mouse, genome-wide cDNA screen, cold-exposure assays, MAPK activity assays, ERR transcriptional reporter assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with physiological readouts, genome-wide screen, and mechanistic pathway dissection; single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"25071184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"GADD45G instructs differentiation of long-term repopulating hematopoietic stem cells (LT-HSCs) by specifically activating MAP3K4-mediated MAPK p38 signaling. Overexpression induces and accelerates differentiation, while absence of GADD45G enhances self-renewal. Single-cell videomicroscopy showed GADD45G expression leads to lineage commitment within 36 hours with a selective reduction in megakaryocytic-erythroid progeny.\",\n      \"method\": \"Single-cell videomicroscopy tracking, genetic overexpression and knockout, MAPK activity assays\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single-cell level tracking combined with loss- and gain-of-function and biochemical pathway analysis; single lab\",\n      \"pmids\": [\"25068120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Gadd45γ overexpression in cardiomyocytes induces apoptosis, fibrosis, and left ventricular dysfunction, while genetic deletion confers resistance to ischemic injury. Mechanistically, Gadd45γ activates receptor-interacting protein 1 (RIP1) and caspase-8 in a p38 MAPK-dependent manner to promote cardiomyocyte death.\",\n      \"method\": \"Adeno-associated viral vector overexpression in vivo, knockout mouse, myocardial infarction model, Western blot for RIP1 and caspase-8 activation, p38 inhibitor experiments\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — both gain- and loss-of-function in vivo with mechanistic dissection of RIP1/caspase-8/p38 pathway; single lab but multiple complementary approaches\",\n      \"pmids\": [\"26370247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SIRT1 activation reduces binding of NF-κB/STAT3 complexes to the GADD45G promoter, leading to transcriptional upregulation of GADD45G. EMSA revealed that NF-κB binds directly to the GADD45G promoter while STAT3 binds indirectly in complex with NF-κB, functioning as a co-repressor.\",\n      \"method\": \"ChIP assay, EMSA, siRNA knockdown, promoter reporter assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA and ChIP provide direct evidence of transcription factor binding; multiple methods but single lab\",\n      \"pmids\": [\"23681230\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Gadd45gamma gene expression is regulated transcriptionally by C/EBPβ and C/EBPδ binding to a non-canonical C/EBP-binding site in its promoter. This was identified as a mechanism by which IL-6 induces GADD45G expression during M1 cell differentiation.\",\n      \"method\": \"EMSA, reporter gene analysis, promoter cloning, expression correlation during differentiation\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — EMSA and reporter assay directly demonstrate transcription factor binding and promoter activity; single lab\",\n      \"pmids\": [\"11012671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"IL-2-induced expression of Gadd45gamma in peripheral T cells is dependent on signaling through the tyrosine kinase JAK3 and transcription factors STAT5a and STAT5b. Gadd45gamma-deficient mice develop normally with intact hematopoiesis, and Gadd45gamma-deficient T lymphocytes show normal responses to IL-2, indicating dispensability for T cell proliferation under normal conditions.\",\n      \"method\": \"Knockout mouse, genetic pathway analysis (JAK3/STAT5 signaling), T-cell proliferation and hematopoiesis assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with pathway analysis; upstream regulator identified; single lab\",\n      \"pmids\": [\"11287618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"GADD45G is directly transcriptionally induced by the basic helix-loop-helix transcription factor Ascl1 during neuronal differentiation. Two E-box consensus sites in the Gadd45gamma promoter are required for Ascl1 regulation, and Ascl1 binding to these sites was confirmed by ChIP. Overexpression of GADD45G alone is sufficient to initiate some aspects of neuronal differentiation independent of Ascl1.\",\n      \"method\": \"Microarray, real-time PCR, chromatin immunoprecipitation (ChIP), transactivation reporter assay, gain-of-function overexpression\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP confirming in vivo Ascl1 binding plus mutagenesis of E-boxes plus functional overexpression; multiple orthogonal methods in single study\",\n      \"pmids\": [\"20382226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"GADD45G overexpression in Hep-G2 hepatoma cells activates both the p38 and JNK kinase pathways to induce G2/M arrest.\",\n      \"method\": \"Transient transfection, flow cytometry, kinase activity assays\",\n      \"journal\": \"Molecular biology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — gain-of-function with defined pathway readouts; single lab, two cell line experiments\",\n      \"pmids\": [\"19048389\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"GADD45G regulates dental epithelial cell proliferation through p38 MAPK-mediated upregulation of p21. Gadd45g is expressed in enamel knots, and its overexpression inhibits dental epithelial cell proliferation via the p38 MAPK/p21 axis.\",\n      \"method\": \"Expression analysis, overexpression experiments, Western blot/flow cytometry for p21 and p38, p38 inhibitor treatment\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — gain-of-function with biochemical pathway dissection; single lab\",\n      \"pmids\": [\"23751077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"GADD45G induces cellular senescence in liver tumor cells through transcriptional activation of SIP1 (Smad-interacting protein-1). JNK (but not p38) MAPK activation is required for GADD45G-mediated SIP1 upregulation, and SIP1 knockdown abrogates the senescence and growth-suppressive effects of GADD45G in vivo.\",\n      \"method\": \"Gain-of-function overexpression, siRNA knockdown, xenograft tumor model, JNK inhibitor treatment, gene expression analysis\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo xenograft rescue plus pharmacological inhibition; single lab\",\n      \"pmids\": [\"26378039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GADD45G interacts directly with E-cadherin (confirmed by GST pull-down and co-immunoprecipitation), enhances E-cadherin membrane localization, and suppresses migration and invasion of esophageal squamous cell carcinoma cells. The dimer-dissociating mutant of GADD45G cannot interact with E-cadherin and loses its ability to suppress migration/invasion, linking dimerization to this function.\",\n      \"method\": \"GST pull-down, co-immunoprecipitation, subcellular fractionation, Transwell migration/invasion assay, loss- and gain-of-function\",\n      \"journal\": \"Digestive diseases and sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — direct binding confirmed by two methods, functional consequence and dimerization-dependence established; single lab\",\n      \"pmids\": [\"31562612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GADD45G reduction in the hippocampus impairs MAPK pathway activity (p38 and JNK) and disrupts activation of downstream targets ATF-2, c-Jun, and CREB, leading to age-like memory deficits in mice. GADD45G is required for induction of key early- and late-response genes associated with aging.\",\n      \"method\": \"Genetic knockdown in mouse hippocampus, behavioral memory tasks, kinase activity assays, gene expression analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function with defined biochemical (p38/JNK/CREB) and behavioral readouts; single lab\",\n      \"pmids\": [\"31826946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"GADD45G/p38 MAPK/CDC25B signaling promotes neurite outgrowth in human neurons by facilitating microtubule polymerization through dephosphorylation of phosphorylated CRMP2 (which promotes microtubule assembly). GADD45G is highly expressed in developing human cerebral specimens.\",\n      \"method\": \"In vitro neuronal differentiation, GADD45G knockdown/overexpression, p38 inhibitor, CDC25B manipulation, microtubule polymerization assay, CRMP2 phosphorylation Western blot\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple pathway components interrogated with biochemical and cellular readouts; single lab\",\n      \"pmids\": [\"35497000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Gadd45g mediates metformin-induced neuronal differentiation of neural stem cells (NSCs) via DNA demethylation. Gadd45g increases demethylation of the NeuroD1 promoter by regulating passive and active DNA demethylation enzymes through an AMPK-independent mechanism. Genetic deficiency of Gadd45g decreases hippocampal neurogenesis and leads to spatial memory decline and depression-like behaviors in mice.\",\n      \"method\": \"Knockout mouse, lentiviral overexpression in NSCs, bisulfite sequencing, neurogenic differentiation assays, behavioral testing\",\n      \"journal\": \"Stem cells (Dayton, Ohio)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse phenotype combined with mechanistic demethylation assay; single lab\",\n      \"pmids\": [\"35511865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GADD45G insufficiency in the hematopoietic system leads to enhanced growth and self-renewal of myeloid-biased hematopoietic stem cells and MPN-like phenotypes. Mechanistically, GADD45G deficiency acts through sequential activation of RAC2, PAK1, and PI3K-AKT signaling pathways.\",\n      \"method\": \"Knockout/knockdown mouse model, hematopoietic stem cell assays, pathway inhibitor experiments, signaling assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo murine model with defined RAC2/PAK1/PI3K-AKT pathway cascade; single lab\",\n      \"pmids\": [\"38582902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GADD45G upregulation in AML cells impairs homologous recombination DNA repair, leading to DNA damage accumulation, apoptosis, differentiation, and growth arrest. GADD45G is epigenetically silenced by histone deacetylation in AML, and its expression is further downregulated by oncogenes FLT3-ITD and MLL-AF9.\",\n      \"method\": \"Gain-of-function overexpression, DNA repair assay (HR assay), apoptosis/differentiation assays, ChIP for histone acetylation, cell line and patient sample analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct HR assay plus epigenetic mechanism established; single lab, multiple methods\",\n      \"pmids\": [\"33945602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GADD45G regulates TNF-α and IL-6 production in LPS-stimulated THP-1 monocyte cells through JNK activation. Knockdown of GADD45G reduces TNF-α protein by 75% and IL-6 by 60%; overexpression increases TNF-α six-fold and IL-6 eighty-fold. JNK inhibition reduces the pro-inflammatory effects of GADD45G.\",\n      \"method\": \"Lentiviral shRNA knockdown, overexpression, ELISA for cytokines, JNK inhibitor (SP600125)\",\n      \"journal\": \"Inflammation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — bidirectional regulation (KD and OE) with pharmacological pathway validation; single lab\",\n      \"pmids\": [\"22752116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"GADD45G is rapidly and strongly upregulated in renal tubular cells following ureteral obstruction. Adenovirus-mediated GADD45G expression in cultured renal tubular cells activates p38 MAPK and upregulates chemokine ligands and fibrosis-related factors including TGF-β1, matrix metalloproteinases, decorin, and BMP2. Silencing GADD45G blunts inflammatory and fibrogenic mediators and monocyte infiltration in obstructed rat kidney.\",\n      \"method\": \"Differential display, adenoviral overexpression, siRNA knockdown, rat ureteral obstruction model, cytokine/chemokine expression assays\",\n      \"journal\": \"Kidney international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function in vivo and in vitro with multiple pathway readouts; single lab\",\n      \"pmids\": [\"18354378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"CR6/GADD45G suppresses colony formation of human lung carcinoma H1299 cells, establishing its function in negative growth control. CR6 is the murine homologue of human CR6 (GADD45G), with 97% amino acid identity, confirming evolutionary conservation.\",\n      \"method\": \"Colony formation assay, cDNA cloning, sequence analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — colony formation functional assay replicated across multiple GADD45 family members; single lab\",\n      \"pmids\": [\"10490824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Ectopic expression of CR6/GADD45G causes G1 phase accumulation and retardation of cellular proliferation in the absence of genotoxic stress, and sensitizes M1 myeloblastic leukemia and H1299 lung carcinoma cells to apoptosis induced by UV, MMS, γ-irradiation, and VP16. In the absence of stress, GADD45G expression does not activate the MTK1/JNK/p38 stress cascade.\",\n      \"method\": \"Inducible expression system (IPTG), flow cytometry, apoptosis assays, kinase activity measurement\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — inducible expression in two cell lines, with multiple genotoxic stresses and kinase assays; single lab\",\n      \"pmids\": [\"11251170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"miR-383 directly targets the 3'-UTR of GADD45G mRNA, reducing its expression. Forced expression of miR-383 decreased Gadd45g protein levels and increased cellular sensitivity to DNA damage in breast cancer cells; this was rescued by ectopic GADD45G without the 3'-UTR. miR-383 also negatively regulates Gadd45g to modulate embryonic stem cell differentiation.\",\n      \"method\": \"miRNA overexpression/inhibition, 3'-UTR luciferase reporter assay, Western blot, rescue experiment\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — direct 3'-UTR binding demonstrated by reporter and rescue; single lab\",\n      \"pmids\": [\"25415264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Gadd45g activates MAPK signaling during mouse ESC differentiation by increasing expression of positive modulators of the MAPK pathway (Csf1r, Igf2, Fgfr3), and this differentiation effect is abolished by MEK inhibition. Additionally, GADD45G overexpression inhibits breast cancer cell invasion and metastasis in vivo.\",\n      \"method\": \"ESC differentiation assays, MEK inhibitor treatment, gene expression analysis, xenograft metastasis model\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — pharmacological pathway validation plus in vivo metastasis model; single lab\",\n      \"pmids\": [\"34601500\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GADD45G is a small nuclear stress-response protein that functions as a tumor suppressor and signaling scaffold: it directly inhibits CDK1/CyclinB1 kinase activity (without disrupting the complex), interacts with PCNA and p21 to impede DNA replication-coupled growth control, and promotes activation of p38 MAPK and JNK (via MAP3K4/MEKK4) to regulate IFN-γ production in TH1 cells, sex determination (through GATA4→SRY), brown adipose thermogenesis (via p38→ERRγ), hematopoietic stem cell differentiation, cardiomyocyte apoptosis (via RIP1/caspase-8), and neuronal differentiation and neurite outgrowth (via p38/CDC25B/CRMP2); its dimer structure—essential for function—is resolved crystallographically, and its expression is tightly regulated by transcription factors (C/EBPβ/δ, Ascl1, NF-κB/STAT3) and epigenetic silencing (promoter methylation, histone deacetylation) that are frequently dysregulated in cancer.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GADD45G (CR6) is a small nuclear stress-response protein and tumor suppressor that couples cell-cycle and growth control to stress-activated MAP kinase signaling [#0, #26]. It exerts direct growth control by specifically binding the CDK1/CyclinB1 complex and inhibiting its kinase activity without disrupting the complex—a mechanistic distinction from its paralogs—and by interacting with PCNA and p21 to impede PCNA-dependent negative growth control [#0, #2]; these activities translate into colony-formation suppression, cell-cycle arrest, and sensitization to genotoxic stress [#26, #27]. A second, dominant arm of GADD45G function is activation of the p38 and JNK MAP kinase cascades through the upstream kinase MEKK4 (MAP3K4) [#3, #9]. This MAPK axis is the common mechanistic thread linking GADD45G to a broad set of physiological outcomes: it drives IFN-γ production and activation-induced cell death in TH1/CD4+ T cells [#1, #3]; specifies male sex determination via a GADD45G→p38→GATA4→SRY cascade [#6, #7]; activates the brown-adipose thermogenic program by potentiating ERRβ/γ transcription [#8]; instructs hematopoietic stem cell differentiation [#9]; promotes p38-dependent RIP1/caspase-8 cardiomyocyte apoptosis [#10]; and supports neuronal differentiation, neurite outgrowth via a p38/CDC25B/CRMP2 module, and hippocampal memory through p38/JNK→ATF-2/c-Jun/CREB signaling [#19, #20]. The function of GADD45G depends on dimerization through a four-helix-bundle interface defined by its αβα-sandwich crystal structure, since dimer-disrupting mutants abolish growth inhibition and abolish its interaction with E-cadherin in tumor-suppressive contexts [#4, #18]. GADD45G expression is tightly controlled transcriptionally by C/EBPβ/δ, Ascl1, JAK3/STAT5, and NF-κB/STAT3, and is silenced epigenetically and post-transcriptionally (histone deacetylation, miR-383) in cancers including AML, where its loss impairs homologous-recombination DNA repair control [#12, #14, #11, #23, #28].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that GADD45G has intrinsic growth-suppressive activity, framing it as a candidate tumor suppressor rather than merely a stress marker.\",\n      \"evidence\": \"Colony formation assay in H1299 lung carcinoma and cDNA cloning of the conserved murine homolog\",\n      \"pmids\": [\"10490824\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify the molecular target mediating growth suppression\", \"No mechanism for how growth arrest is enforced\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined the first physiological loss-of-function role: GADD45G is required for p38/JNK activation and IFN-γ production in TH1 cells, linking it to stress-MAPK signaling and immune effector function.\",\n      \"evidence\": \"Gadd45g knockout mouse with TH1 kinase, cytokine, and contact-hypersensitivity readouts\",\n      \"pmids\": [\"11371360\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream kinase connecting TCR signaling to GADD45G not defined here\", \"Direct molecular target of GADD45G in MAPK activation not identified\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identified the direct molecular partners (PCNA, p21) and CDK1/CyclinB1 underlying growth control, showing GADD45G inhibits CDK1 kinase without complex dissociation—distinguishing it mechanistically from paralogs.\",\n      \"evidence\": \"Co-IP, domain mapping, in vitro/in vivo binding and kinase activity assays\",\n      \"pmids\": [\"11022036\", \"12124778\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of selective CDK1/CyclinB1 inhibition not resolved at this stage\", \"Whether PCNA and CDK1 binding are concurrent or mutually exclusive unclear\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showed GADD45G acts as a scaffold by recruiting CRIF1, which co-localizes in the nucleus and additively inhibits CDK1/CyclinB1, indicating cooperative rather than solo growth control.\",\n      \"evidence\": \"GST pull-down, mammalian two-hybrid, co-IP, histone H1 kinase assay, siRNA\",\n      \"pmids\": [\"12716909\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of the GADD45G–CRIF1–CDK1 assembly unknown\", \"Whether CRIF1 modulates the MAPK arm of GADD45G untested\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Placed MEKK4 (MAP3K4) as the upstream kinase through which GADD45G activates p38, providing the missing mechanistic link between GADD45G and the stress-MAPK cascade.\",\n      \"evidence\": \"MEKK4 knockout mouse, T-cell stimulation, cytokine measurement, genetic epistasis\",\n      \"pmids\": [\"15044949\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether GADD45G binds MAP3K4 directly to relieve autoinhibition not shown structurally here\", \"STAT4-independence defined but full transcriptional output not mapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Resolved the GADD45G structure and proved dimerization through a four-helix-bundle interface is essential for growth-inhibitory function, providing a structural prerequisite for activity.\",\n      \"evidence\": \"X-ray crystallography, dimer-disrupting mutagenesis, cell-based growth assays\",\n      \"pmids\": [\"18445651\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of GADD45G bound to CDK1/CyclinB1 or MAP3K4 not determined\", \"How dimerization mechanically activates downstream kinases unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated a non-redundant developmental role: GADD45G drives male sex determination through a GADD45G→p38→GATA4→SRY cascade, achieving the Sry expression threshold.\",\n      \"evidence\": \"Knockout mice, in situ hybridization, ChIP of GATA4 on Sry promoter, p38 phosphorylation, MAP3K4 transgene rescue\",\n      \"pmids\": [\"23102580\", \"23102581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"What triggers GADD45G expression in the bipotential gonad not defined\", \"Direct biochemical link from GADD45G to p38 in gonadal cells inferred from genetics\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Confirmed strain-independent, paralog-specific requirement of GADD45G for sex determination, ruling out compensation by GADD45A/B.\",\n      \"evidence\": \"Knockout mice on pure C57BL/6 background, phenotyping, Sry RT-PCR\",\n      \"pmids\": [\"23516551\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not address species generalizability beyond mouse\", \"Threshold mechanism of Sry control not quantified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended the GADD45G→p38 axis to metabolism, stem-cell fate, and cell death, showing it potentiates ERRβ/γ thermogenesis in brown fat, instructs HSC differentiation via MAP3K4/p38, and drives cardiomyocyte apoptosis via RIP1/caspase-8.\",\n      \"evidence\": \"Knockout mice, cold-exposure assays, ERR reporters, single-cell videomicroscopy, AAV overexpression, MI model, p38 inhibition\",\n      \"pmids\": [\"25071184\", \"25068120\", \"26370247\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the same p38 output is channeled into divergent fates (thermogenesis vs apoptosis vs differentiation) unexplained\", \"Cell-type-specific cofactors directing outcome unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified upstream transcriptional regulators (Ascl1, C/EBPβ/δ, JAK3/STAT5), establishing how lineage and cytokine signals induce GADD45G to couple to its effector programs.\",\n      \"evidence\": \"ChIP, E-box and C/EBP-site promoter mutagenesis, reporter assays, knockout mice\",\n      \"pmids\": [\"20382226\", \"11012671\", \"11287618\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Combinatorial logic among these inputs in any single cell type not integrated\", \"Quantitative contribution of each factor to baseline vs induced expression unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Mapped repressive transcriptional control of GADD45G, showing SIRT1-regulated NF-κB/STAT3 complexes occupy the promoter as co-repressors, linking GADD45G silencing to oncogenic signaling.\",\n      \"evidence\": \"ChIP, EMSA, siRNA, promoter reporter assays\",\n      \"pmids\": [\"23681230\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab; physiological context of SIRT1-driven derepression not validated in vivo\", \"Direct vs indirect STAT3 binding inferred from EMSA only\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Diversified tumor-suppressive output, showing GADD45G induces JNK-dependent SIP1-mediated senescence in liver tumors and p38/p21-mediated proliferation control in dental epithelium.\",\n      \"evidence\": \"Overexpression, siRNA, xenograft rescue, JNK/p38 inhibitors, gene expression\",\n      \"pmids\": [\"26378039\", \"23751077\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Why JNK vs p38 dominates in different tissues not mechanistically resolved\", \"Single-lab findings per tissue\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established GADD45G as a direct E-cadherin partner that suppresses tumor invasion in a dimerization-dependent manner, and showed it sustains hippocampal MAPK→ATF-2/c-Jun/CREB signaling for memory.\",\n      \"evidence\": \"GST pull-down, co-IP, fractionation, Transwell assays, dimer mutant; hippocampal knockdown with behavioral and kinase readouts\",\n      \"pmids\": [\"31562612\", \"31826946\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How a nuclear MAPK activator promotes E-cadherin membrane localization unresolved\", \"Both single-lab; reciprocal in vivo validation limited\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected GADD45G loss to AML through impaired HR DNA repair and epigenetic silencing, and showed GADD45G activates MAPK during ESC differentiation while suppressing breast cancer metastasis.\",\n      \"evidence\": \"HR repair assay, ChIP for histone acetylation, patient samples, ESC differentiation with MEK inhibition, xenograft metastasis\",\n      \"pmids\": [\"33945602\", \"34601500\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct biochemical mechanism by which GADD45G modulates HR not defined\", \"Single-lab per disease context\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined two further neurogenic mechanisms—p38/CDC25B/CRMP2-driven microtubule polymerization for neurite outgrowth and DNA-demethylation-driven NeuroD1 activation for metformin-induced neurogenesis.\",\n      \"evidence\": \"Neuronal differentiation, p38 inhibitor, CDC25B manipulation, microtubule and CRMP2 phosphorylation assays; knockout mice, bisulfite sequencing, behavior\",\n      \"pmids\": [\"35497000\", \"35511865\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How GADD45G engages DNA-demethylation enzymes mechanistically unresolved\", \"Single-lab; integration with the MAPK arm unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed GADD45G insufficiency drives myeloid-biased HSC self-renewal and MPN-like disease via RAC2→PAK1→PI3K-AKT signaling, extending its tumor-suppressive role to a defined oncogenic cascade.\",\n      \"evidence\": \"Knockout/knockdown mice, HSC assays, pathway inhibitor experiments\",\n      \"pmids\": [\"38582902\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether GADD45G directly restrains RAC2 or acts indirectly not resolved\", \"Single-lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single dimeric GADD45G protein selectively channels its shared p38/JNK output into context-specific fates (differentiation, thermogenesis, senescence, apoptosis) and whether direct GADD45G–MAP3K4 binding mechanistically links its structure to kinase activation.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of GADD45G bound to MAP3K4 or CDK1/CyclinB1\", \"Cell-type cofactors directing divergent MAPK outcomes unidentified\", \"Direct biochemical mechanism of GADD45G effects on DNA repair and demethylation undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 2, 3]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 5, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 6, 8, 9]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 15, 27]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [6, 7, 9, 14]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 3, 24]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [10, 27]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [22, 23, 26]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CDK1\", \"CCNB1\", \"PCNA\", \"CDKN1A\", \"CRIF1\", \"MAP3K4\", \"CDH1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}