{"gene":"MAF","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":1996,"finding":"c-Maf is a basic region/leucine zipper transcription factor that binds to a c-Maf response element (MARE) in the proximal IL-4 promoter and transactivates IL-4 gene expression; it acts in synergy with NF-ATp to initiate endogenous IL-4 production.","method":"EMSA/footprinting, transactivation reporter assays, ectopic expression in Th1 cells and B cells","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (DNA binding, reporter assay, ectopic expression) in foundational paper","pmids":["8674125"],"is_preprint":false},{"year":1999,"finding":"c-Maf has a critical and selective function in IL-4 gene transcription in vivo; c-maf−/− mice show markedly deficient IL-4 production in CD4+ T cells and NK T cells, but normal IL-13 and IgE levels.","method":"Germline knockout mouse, cytokine measurement by ELISA/intracellular staining","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotype, replicated in vivo","pmids":["10403649"],"is_preprint":false},{"year":1999,"finding":"c-Maf is indispensable for lens fiber cell differentiation in mice; c-maf null embryos lack normal lenses and show severe impairment of crystallin gene expression.","method":"Targeted gene disruption (knockout mouse), histology, lacZ reporter knockin","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — germline KO with specific cellular phenotype and downstream gene readout","pmids":["10383433"],"is_preprint":false},{"year":2009,"finding":"c-Maf directly transactivates IL-10 gene expression through binding to a MARE motif in the IL-10 promoter during Th17 polarization; this induction depends on STAT3.","method":"Retroviral transduction, MARE binding assay, reporter assay, STAT3 knockout analysis","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1–2 — direct promoter binding demonstrated with functional transactivation and genetic requirement for STAT3","pmids":["19414776"],"is_preprint":false},{"year":2010,"finding":"AhR binds directly to c-Maf and promotes transactivation of the Il10 and Il21 promoters synergistically, driving Tr1 cell development in response to IL-27.","method":"Co-immunoprecipitation (AhR-c-Maf interaction), reporter assay, AhR ligand manipulation, EAE model","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP plus functional reporter and in vivo disease model","pmids":["20676095"],"is_preprint":false},{"year":2004,"finding":"c-Maf transactivates the cyclin D2 promoter to enhance myeloma proliferation; it also drives integrin β7 expression to promote myeloma adhesion to bone marrow stroma and increase VEGF production.","method":"Gene expression profiling, reporter assay (cyclin D2 promoter), dominant-negative inhibition, xenograft tumor model","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal approaches including reporter assay, DN inhibition, and in vivo tumor model","pmids":["14998494"],"is_preprint":false},{"year":2007,"finding":"GSK-3 phosphorylates Maf (and MafA sequentially on S61, T57, T53, S49), increasing transcriptional activity through recruitment of coactivator P/CAF while also triggering ubiquitination and proteasomal degradation; P/CAF protects MafA from ubiquitination.","method":"In vitro kinase assay, mutagenesis of phosphorylation sites, microarray, Co-IP, ubiquitination assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 — in vitro kinase assay with mutagenesis plus mechanistic follow-up on coactivator recruitment and degradation","pmids":["18042454"],"is_preprint":false},{"year":2009,"finding":"Crystal structure of MafG-DNA complex reveals that Arg57 and Asn61 in the basic region make critical contacts with extended GC sequences of the MARE, defining an alternative bZIP DNA recognition mechanism.","method":"X-ray crystallography of MafG-DNA complex, mutagenesis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with mutagenesis validation","pmids":["19797082"],"is_preprint":false},{"year":2007,"finding":"Nrf2-MafG heterodimer and MafG homodimer bind the consensus MARE with high affinity but show differential binding to degenerate sequences; Ala-502 in Nrf2 (versus Tyr in Maf) is the critical determinant of this binding specificity difference.","method":"Surface plasmon resonance-microarray, mutagenesis (Nrf2 A502Y), target gene expression analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted binding assay with mutagenesis and in vivo gene regulation readout","pmids":["17875642"],"is_preprint":false},{"year":2001,"finding":"DNA sequence-dependent folding of both the basic and ancillary DNA-binding regions of Maf is required for MARE recognition; two basic region residues (not conserved in canonical bZIP proteins) facilitate the conformational change enabling extended DNA element binding.","method":"Secondary structure analysis, trypsin sensitivity, binding affinity/dissociation rate measurements, DNA contact analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — multiple biophysical assays establishing conformational mechanism","pmids":["11179227"],"is_preprint":false},{"year":2009,"finding":"Combined deficiency of MafB and c-Maf enables self-renewal of mature macrophages without loss of differentiated function; this proliferation requires upregulation of KLF4 and c-Myc (demonstrated by shRNA knockdown).","method":"Double-knockout mouse, shRNA knockdown of KLF4/c-Myc, in vivo transplantation","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 — genetic double KO with epistasis by shRNA and in vivo validation","pmids":["19892988"],"is_preprint":false},{"year":2016,"finding":"HERC4 is an E3 ubiquitin ligase that interacts with c-Maf, catalyzes its polyubiquitination at K85 and K297, and promotes its proteasomal degradation; the deubiquitinase USP5 reverses this polyubiquitination.","method":"Affinity chromatography, mass spectrometry, Co-IP, ubiquitination assay, mutagenesis, xenograft tumor model","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1–2 — MS-based identification of E3 ligase, biochemical ubiquitination assay with site mutagenesis, and in vivo tumor model","pmids":["26825710"],"is_preprint":false},{"year":2021,"finding":"Otub1 (OTU family deubiquitinase) interacts with c-Maf, removes K48-linked polyubiquitin chains to prevent its degradation, and enhances its transcriptional activity; this depends on Otub1 Lys71 and its N-terminus but is independent of UBE2O.","method":"Mass spectrometry interactome, Co-IP, ubiquitination assay, mutagenesis, xenograft model","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1–2 — MS-identified interaction, biochemical deubiquitination assay with mutagenesis and in vivo model","pmids":["32842143"],"is_preprint":false},{"year":2019,"finding":"USP7 interacts with c-Maf, MafA, and MafB, blocks their polyubiquitination and degradation, and promotes their transcriptional activity in myeloma cells.","method":"Mass spectrometry, Co-IP, ubiquitination assay, knockdown, luciferase reporter","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — MS-identified interaction with biochemical deubiquitination assay and functional reporter","pmids":["31822558"],"is_preprint":false},{"year":2014,"finding":"c-MAF ubiquitination is mediated by multiple lysine residues; K85 and K350 are sufficient but not the sole sites; c-MAF is also degraded via the lysosomal pathway.","method":"Mutagenesis (K→R substitutions), ubiquitination assay, luciferase reporter, mRNA/protein expression","journal":"The international journal of biochemistry & cell biology","confidence":"Medium","confidence_rationale":"Tier 1 — systematic mutagenesis with functional readout, single lab","pmids":["25448412"],"is_preprint":false},{"year":2010,"finding":"KSHV-encoded miRNAs silence MAF in endothelial cells, revealing MAF as a transcriptional repressor that maintains lymphatic endothelial cell (LEC) identity by suppressing blood endothelial cell (BEC)-specific genes.","method":"miRNA target validation, gene expression profiling, loss-of-function in LEC","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2–3 — functional loss-of-function with defined transcriptional repressor role, single lab","pmids":["20080955"],"is_preprint":false},{"year":2002,"finding":"A new long form of c-Maf (Lc-Maf) interacts with SOX9 through its bZIP domain (interacting with SOX9's HMG box), and they synergistically activate the type II collagen (Col2a1) gene promoter.","method":"Yeast two-hybrid, Co-IP, GST pull-down, domain mapping, luciferase reporter, in situ hybridization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — yeast two-hybrid confirmed by Co-IP and GST pull-down with domain mapping and functional reporter","pmids":["12381733"],"is_preprint":false},{"year":2001,"finding":"Hox proteins (Hoxd12 and MHox/Prx1) interact with c-Maf through its bZIP domain and the homeodomain of Hox, inhibiting c-Maf DNA binding, transcriptional activation, and transforming activity.","method":"Phage display, Co-IP, domain mutagenesis, EMSA, transactivation reporter, transformation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — multiple interaction and functional assays with domain mapping","pmids":["11036080"],"is_preprint":false},{"year":1999,"finding":"c-Maf physically interacts with c-Myb in myeloid cells to form inhibitory complexes; elevated c-Maf drives monocytic differentiation and eventual apoptosis through inhibition of c-Myb targets (Bcl-2, CD13/APN).","method":"Inducible c-Maf overexpression in bipotent myeloid progenitor lines, Co-IP (c-Maf/c-Myb), differentiation assays","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2–3 — Co-IP plus functional overexpression phenotype, single lab","pmids":["10477683"],"is_preprint":false},{"year":2000,"finding":"v-Maf binds as a homodimer to a variant MARE between -66 and -54 in the mouse p53 promoter and transactivates p53 expression; overexpression of v-Maf in primary cells leads to p53-dependent cell death.","method":"EMSA, reporter assay, overexpression in primary cells, p53-null rescue experiment","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — direct DNA binding with functional transactivation and genetic rescue, single lab","pmids":["10747965"],"is_preprint":false},{"year":2006,"finding":"Pax6 and c-Maf co-bind the alphaA-crystallin locus in lens chromatin; high alphaA-crystallin expression correlates with increased c-Maf and CREB binding to the promoter and histone H3K9 hyperacetylation; c-Maf regulates chromatin-remodeling enzymes Brg1 and Snf2h at the locus.","method":"Chromatin immunoprecipitation (ChIP), reporter assays in lens explants, transgenic reporter mice","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — ChIP in native lens chromatin with multiple factors plus in vivo transgenic reporter","pmids":["16675956"],"is_preprint":false},{"year":2009,"finding":"c-Maf directly regulates F4/80 expression in macrophages by binding to a half-MARE site in the F4/80 promoter, as demonstrated by luciferase reporter and EMSA; c-maf null macrophages lose F4/80 expression but retain Mac-1.","method":"c-Maf knockout mouse, luciferase reporter, EMSA","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 — KO with direct promoter binding assays, single lab","pmids":["19539733"],"is_preprint":false},{"year":2012,"finding":"c-Maf is required for development of dorsal horn laminae III/IV neurons and for proper differentiation of MafA+/Ret+/GFRα2+ low-threshold mechanoreceptors in DRG; c-Maf loss compromises central and peripheral projections of mechanoreceptive afferents.","method":"c-Maf conditional knockout mouse, marker gene expression analysis, axon projection tracing","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — clean KO with specific cellular and projection phenotypes, multiple marker readouts","pmids":["22514301"],"is_preprint":false},{"year":2015,"finding":"MAF and MAFB are necessary and sufficient for epidermal progenitor differentiation; they regulate 393 differentiation genes and bind (ChIP-seq) to known epidermal TF genes (GRHL3, ZNF750, KLF4, PRDM1) acting upstream of these factors; lncRNAs ANCR and TINCR are essential upstream regulators of MAF:MAFB.","method":"ChIP-seq, transcriptome profiling (RNA-seq), knockdown/overexpression, epistasis rescue experiments","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP-seq genome-wide binding plus epistasis rescue with multiple orthogonal methods","pmids":["25805135"],"is_preprint":false},{"year":2018,"finding":"c-Maf is a universal transcription factor required for Tγδ17 cell commitment in the thymus; it promotes chromatin accessibility and expression of Rorc and Blk, while antagonizing TCF1 to prevent Tγδ1 (IFN-γ) fate; γδTCR signal strength tunes c-Maf expression.","method":"c-Maf conditional knockout in γδ T cells, ATAC-seq (chromatin accessibility), gene expression, epistasis with TCF1","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with chromatin accessibility profiling and epistasis, single lab but multiple orthogonal methods","pmids":["30538336"],"is_preprint":false},{"year":2018,"finding":"c-MAF inactivation in Treg cells impairs differentiation and IL-10 production of bacteria-specific iTreg cells, causing accumulation of colitogenic Th17 cells and spontaneous colitis; c-MAF is required for RORγt+FOXP3+ Treg identity and function.","method":"Treg-specific c-MAF conditional knockout, microbiota-specific T cell tracking, IL-10 measurement, colitis scoring","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with antigen-specific readout and in vivo disease phenotype","pmids":["29414937"],"is_preprint":false},{"year":2020,"finding":"c-Maf controls immunosuppressive macrophage (M2) polarization; it has direct binding sites in the Csf-1r gene conserved noncoding sequence; it also acts as a metabolic checkpoint regulating the TCA cycle and UDP-GlcNAc biosynthesis to promote M2 polarization.","method":"c-Maf myeloid-specific conditional knockout, ChIP (Csf-1r), metabolomics, T cell suppression assay, tumor growth models","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with direct ChIP evidence and metabolic profiling, multiple readouts","pmids":["31945018"],"is_preprint":false},{"year":2022,"finding":"c-Maf induction in endothelial cells is a critical postnatal switch for liver sinusoidal identity; endothelium-specific deletion of c-Maf disrupts sinusoidal development, expands postnatal hematopoiesis, and increases pro-fibrotic sensitivity; enforced c-Maf expression in generic endothelial cells activates a liver sinusoidal transcriptional program.","method":"scRNA-seq, endothelium-specific conditional KO, c-Maf overexpression in human ECs, functional hepatocyte co-culture","journal":"Cell stem cell","confidence":"High","confidence_rationale":"Tier 2 — conditional KO plus gain-of-function with scRNA-seq and functional validation","pmids":["35364013"],"is_preprint":false},{"year":2021,"finding":"MAF activates β/γ-crystallin expression in high myopia by directly binding crystallin gene promoters and by activating TGF-β1-Smad signaling, establishing a MAF-TGF-β1-crystallin axis in pathological lens growth.","method":"Reporter assay (crystallin promoters), ChIP, Smad signaling assays, myopia mouse models","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 — direct promoter binding with signaling pathway link, replicated in two mouse models","pmids":["33833231"],"is_preprint":false},{"year":2018,"finding":"SUMOylation of c-Maf suppresses IL-21 transactivation; SUMO-defective c-Maf preferentially transactivates Il21 by inhibiting Daxx/HDAC2 recruitment to the Il21 promoter and enhancing CBP/p300-mediated histone acetylation.","method":"Transgenic NOD mice (WT vs. SUMOylation-mutant c-Maf), ChIP (Daxx/HDAC2/CBP/p300), luciferase reporter, CBP30 pharmacological inhibition","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — in vivo transgenic comparison plus mechanistic ChIP and pharmacological confirmation","pmids":["30059018"],"is_preprint":false},{"year":2021,"finding":"c-MAF controls perivascular macrophage identity across multiple organs; myeloid-specific c-MAF deletion ablates LYVE1+/Folate receptor 2+/CD38+ perivascular macrophages and alters adipose tissue vascular branching; this population regulates metabolic syndrome.","method":"c-MAF myeloid conditional KO, flow cytometry, scRNA-seq, HFD metabolic phenotyping","journal":"Science immunology","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with scRNA-seq and in vivo metabolic phenotype","pmids":["34597123"],"is_preprint":false},{"year":2015,"finding":"Linc-MAF-4 is a chromatin-associated lncRNA that associates with LSD1 and EZH2 chromatin modifiers through long-range chromatin interactions to repress MAF transcription in Th1 cells; linc-MAF-4 knockdown skews T cell differentiation toward the Th2 phenotype.","method":"RNA-seq, 3C/chromatin interaction assay, RIP (LSD1/EZH2), linc-MAF-4 knockdown in primary human T cells","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 — chromatin interaction, RIP, and functional knockdown with defined mechanistic pathway","pmids":["25621826"],"is_preprint":false},{"year":2012,"finding":"Bcl6 and c-Maf cooperate in human Tfh cell differentiation: Bcl6 controls migration genes (CXCR4, CXCR5, CCR7) and T-B interaction molecules, while c-Maf induces IL-21 expression and CXCR5; coexpression reveals cooperative regulation of CXCR4, PD-1, and ICOS.","method":"Retroviral transduction of Bcl6 and/or Maf in primary human CD4+ T cells, gene expression profiling","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2–3 — direct gain-of-function in primary human cells with gene expression readout, single lab","pmids":["22427637"],"is_preprint":false},{"year":2011,"finding":"IL-2 drives c-MAF expression in human CD4+ T cells through STAT5 binding to specific sites in the C-MAF promoter, as demonstrated by ChIP; IL-2R blockade significantly inhibits TCR-induced c-MAF expression and downstream IL-4 production.","method":"ChIP (STAT5 at C-MAF promoter), daclizumab/JAK3 inhibitor treatment, cytokine measurement","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP evidence with pharmacological validation, single lab","pmids":["21876034"],"is_preprint":false},{"year":2005,"finding":"ARK5 is a direct transcriptional target of c-MAF and MAFB; c-MAF binds to MARE sequences in the ARK5 promoter (ChIP), and ARK5 mediates IGF-1-induced myeloma cell invasion.","method":"ChIP, reporter assay with MARE mutation/deletion, gene expression induction by c-MAF/MAFB overexpression, invasion assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP plus reporter assay and functional invasion readout, single lab","pmids":["16044163"],"is_preprint":false},{"year":2001,"finding":"c-Maf and Jun share downstream target genes required for cell transformation; transactivation through MARE is necessary for Maf-induced transformation; heterodimer formation with other bZIP factors is not required for transformation.","method":"Leucine zipper swap experiments, chimeric repressor (Mxi1-Sin3 domain), transformation assays in chicken embryo fibroblasts","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — domain swap and repressor fusion with functional transformation readout, single lab","pmids":["11461901"],"is_preprint":false},{"year":2019,"finding":"CRISPR-mediated deletion of MAF in Tph cells abrogates their ability to induce memory B cell differentiation into plasmablasts in vitro, indicating MAF is required for Tph cell helper function via IL-21.","method":"CRISPR KO of MAF in primary human Tph cells, B cell differentiation co-culture assay, IL-21 neutralization","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 — CRISPR KO with defined functional readout, single lab","pmids":["31536480"],"is_preprint":false},{"year":2017,"finding":"TCF-1 limits Tc17 (CD8+ IL-17-producing) cell development by sequentially suppressing MAF and RORγt expression in double-positive thymocytes, and TCF-1 ablation results in enhanced Tc17 differentiation.","method":"TCF-1 conditional KO, chromatin state analysis, gene expression profiling in thymocytes","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with epistasis showing TCF-1→MAF→RORγt pathway, single lab","pmids":["31142588"],"is_preprint":false},{"year":2024,"finding":"TGF-β induces Tfh cell fate in CD4+ T cells through c-Maf; TGF-β-induced CXCR5 expression requires c-Maf but is independent of Bcl6; c-Maf acts as a cell-fate switch between Tfh and Th17 in TGF-β-rich environments.","method":"In vitro Tfh differentiation protocol, c-Maf conditional KO, Bcl6 KO comparison, CXCR5 reporter, in vivo validation","journal":"Science immunology","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with epistasis (Bcl6 vs. c-Maf) and in vivo validation, multiple orthogonal methods","pmids":["38427718"],"is_preprint":false},{"year":2015,"finding":"FGF signaling upregulates c-Maf expression via an FGF2-responsive element (FRE) in the c-Maf promoter containing AP-1 and Ets-binding sites; c-Jun and Etv5/ERM (nuclear effectors of ERK1/2) bind these regions in lens chromatin; FGF signaling also upregulates αA-crystallin directly and indirectly via c-Maf.","method":"ChIP (c-Jun, Etv5/ERM in lens), reporter assay, ERK1/2-deficient lens analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP in native lens chromatin with genetic (ERK KO) confirmation, single lab","pmids":["26719333"],"is_preprint":false}],"current_model":"c-MAF is a basic region/leucine zipper (bZIP) transcription factor that binds MARE sequences as a homodimer or heterodimer (with partners including AhR, NF-AT, SOX9, and CNC/Nrf2 family members) to transactivate tissue-specific target genes including IL-4, IL-10, IL-21, crystallins, cyclin D2, integrin β7, F4/80, ARK5, and Col2a1; its activity and stability are regulated post-translationally by GSK-3-mediated phosphorylation (enhancing transcriptional activity via P/CAF recruitment while triggering ubiquitin-proteasomal degradation), by SUMOylation (which suppresses preferential Il21 transactivation by recruiting Daxx/HDAC2), by polyubiquitination at multiple lysine residues (written by HERC4, erased by Otub1/USP7/USP5), and by lysosomal degradation; upstream, IL-2/STAT5, IL-6/STAT3, TGF-β, and FGF signaling induce c-MAF expression, while p53-dependent miR-34a/miR-145 and the lncRNA linc-MAF-4 (via LSD1/EZH2) repress it; functionally, c-MAF is essential for Th2 IL-4 production, Tr1/Tfh/Th17/Tγδ17/iTreg subset differentiation, macrophage polarization and identity, lens fiber cell differentiation, and liver sinusoidal endothelial cell specification."},"narrative":{"teleology":[{"year":1996,"claim":"Establishing c-Maf as a T cell transcription factor answered whether a bZIP protein could directly activate the IL-4 promoter, founding the concept that Maf factors control cytokine gene transcription.","evidence":"EMSA/footprinting plus reporter and ectopic expression in Th1/B cells","pmids":["8674125"],"confidence":"High","gaps":["No in vivo loss-of-function evidence at this stage","Whether c-Maf is sufficient for IL-4 in a physiological context was untested","Mechanism of cooperation with NFAT was not structurally resolved"]},{"year":1999,"claim":"Germline knockouts demonstrated that c-Maf is essential in vivo for both IL-4 production in CD4+ T cells and for lens fiber cell differentiation, establishing it as a lineage-determining factor in two unrelated tissues.","evidence":"c-maf−/− mice with cytokine measurement and lens histology/crystallin expression analysis","pmids":["10403649","10383433"],"confidence":"High","gaps":["Redundancy with MafB in macrophages/other tissues not addressed","Cell-intrinsic versus microenvironmental contributions to T cell phenotype not dissected","Conditional KO needed to exclude developmental versus functional roles"]},{"year":2001,"claim":"Biophysical analysis revealed that Maf proteins recognize extended MARE elements through a DNA-sequence-dependent conformational folding mechanism in the basic region, distinguishing them from canonical bZIP factors and explaining their unique target selectivity.","evidence":"Secondary structure analysis, trypsin sensitivity, binding affinity/dissociation measurements, and DNA contact mapping","pmids":["11179227"],"confidence":"High","gaps":["Full crystal structure of c-Maf itself not yet available (MafG structure came later)","How conformational change integrates with heterodimer partners was unknown"]},{"year":2001,"claim":"Interaction studies with Hox proteins and c-Myb showed that c-Maf's bZIP domain serves as a protein-interaction platform for both cooperative and inhibitory partnerships, broadening the model beyond simple DNA binding.","evidence":"Phage display, Co-IP, domain mutagenesis, EMSA, and transformation assays (Hox); Co-IP and differentiation assays (c-Myb)","pmids":["11036080","10477683"],"confidence":"High","gaps":["Structural basis of Hox-bZIP interaction unresolved","Physiological relevance of Hox-Maf antagonism in vivo not tested"]},{"year":2002,"claim":"Identification of the c-Maf–SOX9 interaction and synergistic activation of Col2a1 extended c-Maf's role into chondrogenesis and revealed that bZIP–HMG box hetero-partnerships drive cartilage gene expression.","evidence":"Yeast two-hybrid, Co-IP, GST pull-down, domain mapping, luciferase reporter","pmids":["12381733"],"confidence":"High","gaps":["In vivo cartilage phenotype of c-Maf loss not demonstrated","Whether SOX9 interaction is required for all chondrocyte targets unclear"]},{"year":2005,"claim":"Discovery that c-MAF transactivates cyclin D2, integrin β7, and ARK5 in myeloma provided the molecular basis for its oncogenic function—driving proliferation, adhesion, and invasion in t(14;16) myeloma.","evidence":"ChIP, reporter assays with MARE mutation, dominant-negative inhibition, xenograft tumor model, invasion assay","pmids":["14998494","16044163"],"confidence":"High","gaps":["Relative contribution of individual targets to in vivo myeloma progression not dissected","Whether c-MAF-driven myeloma depends on the same ubiquitin regulatory axis was unknown"]},{"year":2006,"claim":"ChIP studies at crystallin loci in lens revealed that c-Maf cooperates with Pax6 and CREB to recruit chromatin remodelers Brg1 and Snf2h, showing it acts as a chromatin organizer, not just a classical transactivator.","evidence":"ChIP in lens chromatin, reporter assays in lens explants, transgenic reporter mice","pmids":["16675956"],"confidence":"High","gaps":["Whether c-Maf directly recruits Brg1/Snf2h or does so indirectly was unresolved","Genome-wide chromatin remodeling by c-Maf in lens not profiled"]},{"year":2007,"claim":"GSK-3 phosphorylation was shown to create a dual switch—enhancing c-Maf transcriptional activity via P/CAF coactivator recruitment while simultaneously marking it for ubiquitin-proteasomal degradation—explaining how Maf protein turnover couples to peak transcriptional output.","evidence":"In vitro kinase assay, phosphosite mutagenesis, Co-IP with P/CAF, ubiquitination assay","pmids":["18042454"],"confidence":"High","gaps":["Specific E3 ligase recognizing phosphorylated Maf not identified at this point","Whether the same mechanism applies to c-Maf versus MafA in all tissues was unclear"]},{"year":2009,"claim":"Structural determination of the MafG–DNA complex and SPR binding studies with Nrf2–MafG heterodimers resolved how Maf basic-region residues (Arg57, Asn61) recognize flanking GC sequences and how a single residue difference (Ala-502 in Nrf2 vs. Tyr in Maf) dictates differential MARE binding specificity.","evidence":"X-ray crystallography of MafG–DNA, mutagenesis, surface plasmon resonance-microarray","pmids":["19797082","17875642"],"confidence":"High","gaps":["Crystal structure of full-length c-Maf or c-Maf homodimer on DNA still lacking","Structural basis of Maf–CNC heterodimer selectivity on endogenous chromatin unresolved"]},{"year":2009,"claim":"Demonstrating that combined MafB and c-Maf deficiency enables macrophage self-renewal (via KLF4/c-Myc upregulation) without dedifferentiation revealed that large Maf factors function as anti-proliferative gatekeepers in terminally differentiated macrophages.","evidence":"MafB/c-Maf double-knockout macrophages, shRNA knockdown of KLF4/c-Myc, in vivo transplantation","pmids":["19892988"],"confidence":"High","gaps":["Whether the self-renewal phenotype is tumor-prone in vivo was not assessed","Relative individual contributions of MafB versus c-Maf to the anti-proliferative block were not fully separated"]},{"year":2009,"claim":"c-Maf was shown to directly transactivate IL-10 via MARE binding in a STAT3-dependent manner during Th17 polarization, and with AhR to co-activate IL-10 and IL-21 for Tr1 cells, expanding its cytokine repertoire beyond IL-4 and linking it to anti-inflammatory T cell programs.","evidence":"Retroviral transduction, MARE binding assay, STAT3 KO analysis, AhR Co-IP, reporter assay, EAE model","pmids":["19414776","20676095"],"confidence":"High","gaps":["Genome-wide target overlap between Th2 and Tr1 c-Maf programs not mapped","Whether AhR–c-Maf interaction is direct or bridged by DNA was not structurally resolved"]},{"year":2015,"claim":"ChIP-seq and epistasis experiments established MAF and MAFB as master regulators of epidermal progenitor differentiation, binding upstream of 393 differentiation genes and key TFs (GRHL3, ZNF750, KLF4, PRDM1), while the lncRNA linc-MAF-4 was shown to recruit LSD1/EZH2 to repress MAF transcription in Th1 cells.","evidence":"ChIP-seq, RNA-seq, knockdown/overexpression, RIP with LSD1/EZH2, 3C chromatin interaction assay","pmids":["25805135","25621826"],"confidence":"High","gaps":["Mechanism by which ANCR/TINCR control MAF/MAFB expression not fully dissected","Whether linc-MAF-4 regulation operates in non-T cell contexts unknown"]},{"year":2016,"claim":"Identification of HERC4 as the E3 ubiquitin ligase for c-Maf (polyubiquitinating K85 and K297), and USP5 as its opposing deubiquitinase, provided the first defined writer-eraser pair controlling c-Maf stability in myeloma.","evidence":"Affinity chromatography/MS, Co-IP, ubiquitination assay with lysine mutagenesis, xenograft model","pmids":["26825710"],"confidence":"High","gaps":["Whether HERC4 recognizes GSK-3-phosphorylated c-Maf specifically was not tested","Role of HERC4 in non-myeloma c-Maf-expressing cells unknown"]},{"year":2018,"claim":"Conditional knockouts in γδ T cells and Treg cells revealed that c-Maf is a universal fate switch for Tγδ17 commitment (by promoting Rorc chromatin accessibility and antagonizing TCF1) and for RORγt+FOXP3+ iTreg differentiation and IL-10 production, with its loss causing spontaneous colitis.","evidence":"Conditional KO in γδ and Treg lineages, ATAC-seq, antigen-specific T cell tracking, colitis scoring","pmids":["30538336","29414937"],"confidence":"High","gaps":["Direct c-Maf binding sites at Rorc locus not mapped by ChIP","Whether c-Maf–TCF1 antagonism involves direct physical interaction or indirect competition was unresolved"]},{"year":2018,"claim":"SUMOylation of c-Maf was shown to differentially regulate target gene selection: SUMO modification recruits Daxx/HDAC2 to specifically repress Il21 while sparing other targets, and SUMO-deficient c-Maf preferentially activates Il21 via enhanced CBP/p300-mediated acetylation.","evidence":"Transgenic NOD mice expressing WT versus SUMO-mutant c-Maf, ChIP for Daxx/HDAC2/CBP/p300, pharmacological CBP inhibition","pmids":["30059018"],"confidence":"High","gaps":["Whether SUMOylation affects other c-Maf targets beyond Il21 was not comprehensively tested","The SUMO E3 ligase responsible for c-Maf SUMOylation in T cells was not identified"]},{"year":2020,"claim":"Myeloid-specific c-Maf deletion showed it controls M2 macrophage polarization by binding the Csf-1r conserved noncoding sequence and by acting as a metabolic checkpoint regulating the TCA cycle and UDP-GlcNAc biosynthesis, linking transcriptional identity to metabolic programming.","evidence":"Myeloid conditional KO, ChIP at Csf-1r, metabolomics, T cell suppression assay, tumor model","pmids":["31945018"],"confidence":"High","gaps":["Mechanism by which c-Maf directly controls metabolic enzyme expression not detailed","Whether metabolic effects are cell-autonomous or secondary to Csf-1r regulation was not fully dissected"]},{"year":2021,"claim":"Identification of Otub1 and USP7 as additional deubiquitinases that stabilize c-Maf (removing K48-linked chains) completed a multi-enzyme regulatory network controlling c-Maf abundance, particularly in myeloma.","evidence":"MS interactome, Co-IP, ubiquitination assays with mutagenesis, xenograft models","pmids":["32842143","31822558"],"confidence":"High","gaps":["Hierarchical or redundant relationships among USP5, USP7, and Otub1 not established","Tissue-specific usage of different DUBs for c-Maf regulation unknown"]},{"year":2022,"claim":"Endothelium-specific deletion showed c-Maf is a critical postnatal switch for liver sinusoidal endothelial cell identity, with enforced expression sufficient to activate the sinusoidal transcriptional program in generic endothelial cells.","evidence":"scRNA-seq, endothelium-specific conditional KO, c-Maf overexpression in human ECs, hepatocyte co-culture","pmids":["35364013"],"confidence":"High","gaps":["Upstream signals inducing c-Maf specifically in liver sinusoidal endothelium not identified","Direct genomic targets of c-Maf in sinusoidal endothelium not mapped by ChIP-seq"]},{"year":2024,"claim":"TGF-β was shown to induce Tfh fate through c-Maf independently of Bcl6, establishing c-Maf as a cell-fate switch between Tfh and Th17 in TGF-β-rich environments and dissociating the long-assumed Bcl6 requirement for CXCR5 induction.","evidence":"In vitro Tfh differentiation, c-Maf and Bcl6 conditional KO comparison, CXCR5 reporter, in vivo validation","pmids":["38427718"],"confidence":"High","gaps":["Whether c-Maf directly binds CXCR5 regulatory elements was not shown","How c-Maf integrates TGF-β and TCR signals to decide between Tfh and Th17 fate at the single-cell level remains unclear"]},{"year":null,"claim":"A comprehensive understanding of how c-Maf selects among its diverse target genes in different lineages—whether through combinatorial partner usage, chromatin context, or post-translational modification state—remains to be integrated into a unified model.","evidence":"","pmids":[],"confidence":"Low","gaps":["No genome-wide c-Maf ChIP-seq across multiple cell types exists for systematic comparison","Crystal structure of c-Maf homodimer or c-Maf–partner heterodimer on DNA has not been determined","SUMO E3 ligase and site-specific kinase crosstalk in non-myeloma contexts remain uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,7,8,9]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,3,5,20,23,24,26,27]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,6,20,29]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,3,4,25,30,38]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,22,23,27]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[20,31]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[6,11,12,14]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[5,34]}],"complexes":[],"partners":["AHR","SOX9","HERC4","OTUB1","USP7","USP5","DAXX","PAX6"],"other_free_text":[]},"mechanistic_narrative":"c-MAF is a large Maf-family bZIP transcription factor that functions as a lineage-determining regulator across multiple cell types, directing T helper subset specification (Th2, Tfh, Tr1, Tγδ17, iTreg), macrophage identity and polarization, lens fiber cell differentiation, epidermal progenitor differentiation, and liver sinusoidal endothelial cell specification [PMID:8674125, PMID:10403649, PMID:30538336, PMID:29414937, PMID:35364013, PMID:25805135]. It binds MARE (Maf recognition element) sequences as a homodimer or heterodimer with partners such as AhR, SOX9, and Nrf2, employing a DNA-sequence-dependent conformational change in its basic region that enables recognition of extended GC-flanking sequences distinct from canonical bZIP elements [PMID:11179227, PMID:19797082, PMID:17875642]. c-MAF directly transactivates key target genes—including IL-4, IL-10, IL-21, crystallins, cyclin D2, integrin β7, F4/80, and Csf-1r—and can also remodel chromatin by recruiting Pax6, CREB, Brg1/Snf2h at crystallin loci or by promoting chromatin accessibility at Rorc and Blk loci in γδ T cells [PMID:8674125, PMID:19414776, PMID:20676095, PMID:16675956, PMID:30538336]. Its stability and output are tuned by GSK-3 phosphorylation (which enhances transcriptional activity via P/CAF recruitment while triggering proteasomal degradation), by SUMOylation (which suppresses IL-21 transactivation through Daxx/HDAC2 recruitment), and by ubiquitin-dependent turnover mediated by the E3 ligase HERC4 and opposed by deubiquitinases Otub1, USP7, and USP5 [PMID:18042454, PMID:30059018, PMID:26825710, PMID:32842143, PMID:31822558]."},"prefetch_data":{"uniprot":{"accession":"O75444","full_name":"Transcription factor Maf","aliases":["Proto-oncogene c-Maf","V-maf musculoaponeurotic fibrosarcoma oncogene homolog"],"length_aa":373,"mass_kda":38.5,"function":"Acts as a transcriptional activator or repressor. Involved in embryonic lens fiber cell development. Recruits the transcriptional coactivators CREBBP and/or EP300 to crystallin promoters leading to up-regulation of crystallin gene during lens fiber cell differentiation. Activates the expression of IL4 in T helper 2 (Th2) cells. Increases T-cell susceptibility to apoptosis by interacting with MYB and decreasing BCL2 expression. Together with PAX6, transactivates strongly the glucagon gene promoter through the G1 element. Activates transcription of the CD13 proximal promoter in endothelial cells. Represses transcription of the CD13 promoter in early stages of myelopoiesis by affecting the ETS1 and MYB cooperative interaction. Involved in the initial chondrocyte terminal differentiation and the disappearance of hypertrophic chondrocytes during endochondral bone development. Binds to the sequence 5'-[GT]G[GC]N[GT]NCTCAGNN-3' in the L7 promoter. Binds to the T-MARE (Maf response element) sites of lens-specific alpha- and beta-crystallin gene promoters. Binds element G1 on the glucagon promoter. Binds an AT-rich region adjacent to the TGC motif (atypical Maf response element) in the CD13 proximal promoter in endothelial cells (By similarity). When overexpressed, represses anti-oxidant response element (ARE)-mediated transcription. Involved either as an oncogene or as a tumor suppressor, depending on the cell context. Binds to the ARE sites of detoxifying enzyme gene promoters","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/O75444/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MAF","classification":"Not Classified","n_dependent_lines":19,"n_total_lines":1208,"dependency_fraction":0.015728476821192054},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MAF","total_profiled":1310},"omim":[{"mim_id":"621376","title":"CILIA- AND FLAGELLA-ASSOCIATED PROTEIN 206; CFAP206","url":"https://www.omim.org/entry/621376"},{"mim_id":"620931","title":"IMMUNODEFICIENCY 126, SUSCEPTIBILITY TO; IMD126","url":"https://www.omim.org/entry/620931"},{"mim_id":"620923","title":"PARKINSON DISEASE 26, AUTOSOMAL DOMINANT, SUSCEPTIBILITY TO; PARK26","url":"https://www.omim.org/entry/620923"},{"mim_id":"620718","title":"OROFACIODIGITAL SYNDROME XX; OFD20","url":"https://www.omim.org/entry/620718"},{"mim_id":"620635","title":"CARDIOMYOPATHY, DILATED, 2J; CMD2J","url":"https://www.omim.org/entry/620635"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Nuclear bodies","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Additional"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/MAF"},"hgnc":{"alias_symbol":["c-MAF"],"prev_symbol":[]},"alphafold":{"accession":"O75444","domains":[{"cath_id":"1.20.5.170","chopping":"258-353","consensus_level":"medium","plddt":96.1322,"start":258,"end":353}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O75444","model_url":"https://alphafold.ebi.ac.uk/files/AF-O75444-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O75444-F1-predicted_aligned_error_v6.png","plddt_mean":59.34},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MAF","jax_strain_url":"https://www.jax.org/strain/search?query=MAF"},"sequence":{"accession":"O75444","fasta_url":"https://rest.uniprot.org/uniprotkb/O75444.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O75444/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O75444"}},"corpus_meta":[{"pmid":"20676095","id":"PMC_20676095","title":"The aryl hydrocarbon receptor interacts 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immunology","url":"https://pubmed.ncbi.nlm.nih.gov/35359922","citation_count":31,"is_preprint":false},{"pmid":"24664492","id":"PMC_24664492","title":"Identification of a novel missense mutation of MAF in a Japanese family with congenital cataract by whole exome sequencing: a clinical report and review of literature.","date":"2014","source":"American journal of medical genetics. 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IL-4 promoter and transactivates IL-4 gene expression; it acts in synergy with NF-ATp to initiate endogenous IL-4 production.\",\n      \"method\": \"EMSA/footprinting, transactivation reporter assays, ectopic expression in Th1 cells and B cells\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (DNA binding, reporter assay, ectopic expression) in foundational paper\",\n      \"pmids\": [\"8674125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"c-Maf has a critical and selective function in IL-4 gene transcription in vivo; c-maf−/− mice show markedly deficient IL-4 production in CD4+ T cells and NK T cells, but normal IL-13 and IgE levels.\",\n      \"method\": \"Germline knockout mouse, cytokine measurement by ELISA/intracellular staining\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype, replicated in vivo\",\n      \"pmids\": [\"10403649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"c-Maf is indispensable for lens fiber cell differentiation in mice; c-maf null embryos lack normal lenses and show severe impairment of crystallin gene expression.\",\n      \"method\": \"Targeted gene disruption (knockout mouse), histology, lacZ reporter knockin\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — germline KO with specific cellular phenotype and downstream gene readout\",\n      \"pmids\": [\"10383433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"c-Maf directly transactivates IL-10 gene expression through binding to a MARE motif in the IL-10 promoter during Th17 polarization; this induction depends on STAT3.\",\n      \"method\": \"Retroviral transduction, MARE binding assay, reporter assay, STAT3 knockout analysis\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct promoter binding demonstrated with functional transactivation and genetic requirement for STAT3\",\n      \"pmids\": [\"19414776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"AhR binds directly to c-Maf and promotes transactivation of the Il10 and Il21 promoters synergistically, driving Tr1 cell development in response to IL-27.\",\n      \"method\": \"Co-immunoprecipitation (AhR-c-Maf interaction), reporter assay, AhR ligand manipulation, EAE model\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus functional reporter and in vivo disease model\",\n      \"pmids\": [\"20676095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"c-Maf transactivates the cyclin D2 promoter to enhance myeloma proliferation; it also drives integrin β7 expression to promote myeloma adhesion to bone marrow stroma and increase VEGF production.\",\n      \"method\": \"Gene expression profiling, reporter assay (cyclin D2 promoter), dominant-negative inhibition, xenograft tumor model\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal approaches including reporter assay, DN inhibition, and in vivo tumor model\",\n      \"pmids\": [\"14998494\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"GSK-3 phosphorylates Maf (and MafA sequentially on S61, T57, T53, S49), increasing transcriptional activity through recruitment of coactivator P/CAF while also triggering ubiquitination and proteasomal degradation; P/CAF protects MafA from ubiquitination.\",\n      \"method\": \"In vitro kinase assay, mutagenesis of phosphorylation sites, microarray, Co-IP, ubiquitination assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinase assay with mutagenesis plus mechanistic follow-up on coactivator recruitment and degradation\",\n      \"pmids\": [\"18042454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Crystal structure of MafG-DNA complex reveals that Arg57 and Asn61 in the basic region make critical contacts with extended GC sequences of the MARE, defining an alternative bZIP DNA recognition mechanism.\",\n      \"method\": \"X-ray crystallography of MafG-DNA complex, mutagenesis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with mutagenesis validation\",\n      \"pmids\": [\"19797082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Nrf2-MafG heterodimer and MafG homodimer bind the consensus MARE with high affinity but show differential binding to degenerate sequences; Ala-502 in Nrf2 (versus Tyr in Maf) is the critical determinant of this binding specificity difference.\",\n      \"method\": \"Surface plasmon resonance-microarray, mutagenesis (Nrf2 A502Y), target gene expression analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted binding assay with mutagenesis and in vivo gene regulation readout\",\n      \"pmids\": [\"17875642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"DNA sequence-dependent folding of both the basic and ancillary DNA-binding regions of Maf is required for MARE recognition; two basic region residues (not conserved in canonical bZIP proteins) facilitate the conformational change enabling extended DNA element binding.\",\n      \"method\": \"Secondary structure analysis, trypsin sensitivity, binding affinity/dissociation rate measurements, DNA contact analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple biophysical assays establishing conformational mechanism\",\n      \"pmids\": [\"11179227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Combined deficiency of MafB and c-Maf enables self-renewal of mature macrophages without loss of differentiated function; this proliferation requires upregulation of KLF4 and c-Myc (demonstrated by shRNA knockdown).\",\n      \"method\": \"Double-knockout mouse, shRNA knockdown of KLF4/c-Myc, in vivo transplantation\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic double KO with epistasis by shRNA and in vivo validation\",\n      \"pmids\": [\"19892988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"HERC4 is an E3 ubiquitin ligase that interacts with c-Maf, catalyzes its polyubiquitination at K85 and K297, and promotes its proteasomal degradation; the deubiquitinase USP5 reverses this polyubiquitination.\",\n      \"method\": \"Affinity chromatography, mass spectrometry, Co-IP, ubiquitination assay, mutagenesis, xenograft tumor model\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — MS-based identification of E3 ligase, biochemical ubiquitination assay with site mutagenesis, and in vivo tumor model\",\n      \"pmids\": [\"26825710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Otub1 (OTU family deubiquitinase) interacts with c-Maf, removes K48-linked polyubiquitin chains to prevent its degradation, and enhances its transcriptional activity; this depends on Otub1 Lys71 and its N-terminus but is independent of UBE2O.\",\n      \"method\": \"Mass spectrometry interactome, Co-IP, ubiquitination assay, mutagenesis, xenograft model\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — MS-identified interaction, biochemical deubiquitination assay with mutagenesis and in vivo model\",\n      \"pmids\": [\"32842143\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"USP7 interacts with c-Maf, MafA, and MafB, blocks their polyubiquitination and degradation, and promotes their transcriptional activity in myeloma cells.\",\n      \"method\": \"Mass spectrometry, Co-IP, ubiquitination assay, knockdown, luciferase reporter\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — MS-identified interaction with biochemical deubiquitination assay and functional reporter\",\n      \"pmids\": [\"31822558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"c-MAF ubiquitination is mediated by multiple lysine residues; K85 and K350 are sufficient but not the sole sites; c-MAF is also degraded via the lysosomal pathway.\",\n      \"method\": \"Mutagenesis (K→R substitutions), ubiquitination assay, luciferase reporter, mRNA/protein expression\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — systematic mutagenesis with functional readout, single lab\",\n      \"pmids\": [\"25448412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"KSHV-encoded miRNAs silence MAF in endothelial cells, revealing MAF as a transcriptional repressor that maintains lymphatic endothelial cell (LEC) identity by suppressing blood endothelial cell (BEC)-specific genes.\",\n      \"method\": \"miRNA target validation, gene expression profiling, loss-of-function in LEC\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — functional loss-of-function with defined transcriptional repressor role, single lab\",\n      \"pmids\": [\"20080955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"A new long form of c-Maf (Lc-Maf) interacts with SOX9 through its bZIP domain (interacting with SOX9's HMG box), and they synergistically activate the type II collagen (Col2a1) gene promoter.\",\n      \"method\": \"Yeast two-hybrid, Co-IP, GST pull-down, domain mapping, luciferase reporter, in situ hybridization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — yeast two-hybrid confirmed by Co-IP and GST pull-down with domain mapping and functional reporter\",\n      \"pmids\": [\"12381733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Hox proteins (Hoxd12 and MHox/Prx1) interact with c-Maf through its bZIP domain and the homeodomain of Hox, inhibiting c-Maf DNA binding, transcriptional activation, and transforming activity.\",\n      \"method\": \"Phage display, Co-IP, domain mutagenesis, EMSA, transactivation reporter, transformation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple interaction and functional assays with domain mapping\",\n      \"pmids\": [\"11036080\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"c-Maf physically interacts with c-Myb in myeloid cells to form inhibitory complexes; elevated c-Maf drives monocytic differentiation and eventual apoptosis through inhibition of c-Myb targets (Bcl-2, CD13/APN).\",\n      \"method\": \"Inducible c-Maf overexpression in bipotent myeloid progenitor lines, Co-IP (c-Maf/c-Myb), differentiation assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — Co-IP plus functional overexpression phenotype, single lab\",\n      \"pmids\": [\"10477683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"v-Maf binds as a homodimer to a variant MARE between -66 and -54 in the mouse p53 promoter and transactivates p53 expression; overexpression of v-Maf in primary cells leads to p53-dependent cell death.\",\n      \"method\": \"EMSA, reporter assay, overexpression in primary cells, p53-null rescue experiment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct DNA binding with functional transactivation and genetic rescue, single lab\",\n      \"pmids\": [\"10747965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Pax6 and c-Maf co-bind the alphaA-crystallin locus in lens chromatin; high alphaA-crystallin expression correlates with increased c-Maf and CREB binding to the promoter and histone H3K9 hyperacetylation; c-Maf regulates chromatin-remodeling enzymes Brg1 and Snf2h at the locus.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), reporter assays in lens explants, transgenic reporter mice\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP in native lens chromatin with multiple factors plus in vivo transgenic reporter\",\n      \"pmids\": [\"16675956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"c-Maf directly regulates F4/80 expression in macrophages by binding to a half-MARE site in the F4/80 promoter, as demonstrated by luciferase reporter and EMSA; c-maf null macrophages lose F4/80 expression but retain Mac-1.\",\n      \"method\": \"c-Maf knockout mouse, luciferase reporter, EMSA\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO with direct promoter binding assays, single lab\",\n      \"pmids\": [\"19539733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"c-Maf is required for development of dorsal horn laminae III/IV neurons and for proper differentiation of MafA+/Ret+/GFRα2+ low-threshold mechanoreceptors in DRG; c-Maf loss compromises central and peripheral projections of mechanoreceptive afferents.\",\n      \"method\": \"c-Maf conditional knockout mouse, marker gene expression analysis, axon projection tracing\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with specific cellular and projection phenotypes, multiple marker readouts\",\n      \"pmids\": [\"22514301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MAF and MAFB are necessary and sufficient for epidermal progenitor differentiation; they regulate 393 differentiation genes and bind (ChIP-seq) to known epidermal TF genes (GRHL3, ZNF750, KLF4, PRDM1) acting upstream of these factors; lncRNAs ANCR and TINCR are essential upstream regulators of MAF:MAFB.\",\n      \"method\": \"ChIP-seq, transcriptome profiling (RNA-seq), knockdown/overexpression, epistasis rescue experiments\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP-seq genome-wide binding plus epistasis rescue with multiple orthogonal methods\",\n      \"pmids\": [\"25805135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"c-Maf is a universal transcription factor required for Tγδ17 cell commitment in the thymus; it promotes chromatin accessibility and expression of Rorc and Blk, while antagonizing TCF1 to prevent Tγδ1 (IFN-γ) fate; γδTCR signal strength tunes c-Maf expression.\",\n      \"method\": \"c-Maf conditional knockout in γδ T cells, ATAC-seq (chromatin accessibility), gene expression, epistasis with TCF1\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with chromatin accessibility profiling and epistasis, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"30538336\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"c-MAF inactivation in Treg cells impairs differentiation and IL-10 production of bacteria-specific iTreg cells, causing accumulation of colitogenic Th17 cells and spontaneous colitis; c-MAF is required for RORγt+FOXP3+ Treg identity and function.\",\n      \"method\": \"Treg-specific c-MAF conditional knockout, microbiota-specific T cell tracking, IL-10 measurement, colitis scoring\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with antigen-specific readout and in vivo disease phenotype\",\n      \"pmids\": [\"29414937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"c-Maf controls immunosuppressive macrophage (M2) polarization; it has direct binding sites in the Csf-1r gene conserved noncoding sequence; it also acts as a metabolic checkpoint regulating the TCA cycle and UDP-GlcNAc biosynthesis to promote M2 polarization.\",\n      \"method\": \"c-Maf myeloid-specific conditional knockout, ChIP (Csf-1r), metabolomics, T cell suppression assay, tumor growth models\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with direct ChIP evidence and metabolic profiling, multiple readouts\",\n      \"pmids\": [\"31945018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"c-Maf induction in endothelial cells is a critical postnatal switch for liver sinusoidal identity; endothelium-specific deletion of c-Maf disrupts sinusoidal development, expands postnatal hematopoiesis, and increases pro-fibrotic sensitivity; enforced c-Maf expression in generic endothelial cells activates a liver sinusoidal transcriptional program.\",\n      \"method\": \"scRNA-seq, endothelium-specific conditional KO, c-Maf overexpression in human ECs, functional hepatocyte co-culture\",\n      \"journal\": \"Cell stem cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO plus gain-of-function with scRNA-seq and functional validation\",\n      \"pmids\": [\"35364013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MAF activates β/γ-crystallin expression in high myopia by directly binding crystallin gene promoters and by activating TGF-β1-Smad signaling, establishing a MAF-TGF-β1-crystallin axis in pathological lens growth.\",\n      \"method\": \"Reporter assay (crystallin promoters), ChIP, Smad signaling assays, myopia mouse models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct promoter binding with signaling pathway link, replicated in two mouse models\",\n      \"pmids\": [\"33833231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SUMOylation of c-Maf suppresses IL-21 transactivation; SUMO-defective c-Maf preferentially transactivates Il21 by inhibiting Daxx/HDAC2 recruitment to the Il21 promoter and enhancing CBP/p300-mediated histone acetylation.\",\n      \"method\": \"Transgenic NOD mice (WT vs. SUMOylation-mutant c-Maf), ChIP (Daxx/HDAC2/CBP/p300), luciferase reporter, CBP30 pharmacological inhibition\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo transgenic comparison plus mechanistic ChIP and pharmacological confirmation\",\n      \"pmids\": [\"30059018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"c-MAF controls perivascular macrophage identity across multiple organs; myeloid-specific c-MAF deletion ablates LYVE1+/Folate receptor 2+/CD38+ perivascular macrophages and alters adipose tissue vascular branching; this population regulates metabolic syndrome.\",\n      \"method\": \"c-MAF myeloid conditional KO, flow cytometry, scRNA-seq, HFD metabolic phenotyping\",\n      \"journal\": \"Science immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with scRNA-seq and in vivo metabolic phenotype\",\n      \"pmids\": [\"34597123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Linc-MAF-4 is a chromatin-associated lncRNA that associates with LSD1 and EZH2 chromatin modifiers through long-range chromatin interactions to repress MAF transcription in Th1 cells; linc-MAF-4 knockdown skews T cell differentiation toward the Th2 phenotype.\",\n      \"method\": \"RNA-seq, 3C/chromatin interaction assay, RIP (LSD1/EZH2), linc-MAF-4 knockdown in primary human T cells\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — chromatin interaction, RIP, and functional knockdown with defined mechanistic pathway\",\n      \"pmids\": [\"25621826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Bcl6 and c-Maf cooperate in human Tfh cell differentiation: Bcl6 controls migration genes (CXCR4, CXCR5, CCR7) and T-B interaction molecules, while c-Maf induces IL-21 expression and CXCR5; coexpression reveals cooperative regulation of CXCR4, PD-1, and ICOS.\",\n      \"method\": \"Retroviral transduction of Bcl6 and/or Maf in primary human CD4+ T cells, gene expression profiling\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — direct gain-of-function in primary human cells with gene expression readout, single lab\",\n      \"pmids\": [\"22427637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"IL-2 drives c-MAF expression in human CD4+ T cells through STAT5 binding to specific sites in the C-MAF promoter, as demonstrated by ChIP; IL-2R blockade significantly inhibits TCR-induced c-MAF expression and downstream IL-4 production.\",\n      \"method\": \"ChIP (STAT5 at C-MAF promoter), daclizumab/JAK3 inhibitor treatment, cytokine measurement\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP evidence with pharmacological validation, single lab\",\n      \"pmids\": [\"21876034\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ARK5 is a direct transcriptional target of c-MAF and MAFB; c-MAF binds to MARE sequences in the ARK5 promoter (ChIP), and ARK5 mediates IGF-1-induced myeloma cell invasion.\",\n      \"method\": \"ChIP, reporter assay with MARE mutation/deletion, gene expression induction by c-MAF/MAFB overexpression, invasion assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP plus reporter assay and functional invasion readout, single lab\",\n      \"pmids\": [\"16044163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"c-Maf and Jun share downstream target genes required for cell transformation; transactivation through MARE is necessary for Maf-induced transformation; heterodimer formation with other bZIP factors is not required for transformation.\",\n      \"method\": \"Leucine zipper swap experiments, chimeric repressor (Mxi1-Sin3 domain), transformation assays in chicken embryo fibroblasts\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain swap and repressor fusion with functional transformation readout, single lab\",\n      \"pmids\": [\"11461901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CRISPR-mediated deletion of MAF in Tph cells abrogates their ability to induce memory B cell differentiation into plasmablasts in vitro, indicating MAF is required for Tph cell helper function via IL-21.\",\n      \"method\": \"CRISPR KO of MAF in primary human Tph cells, B cell differentiation co-culture assay, IL-21 neutralization\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO with defined functional readout, single lab\",\n      \"pmids\": [\"31536480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TCF-1 limits Tc17 (CD8+ IL-17-producing) cell development by sequentially suppressing MAF and RORγt expression in double-positive thymocytes, and TCF-1 ablation results in enhanced Tc17 differentiation.\",\n      \"method\": \"TCF-1 conditional KO, chromatin state analysis, gene expression profiling in thymocytes\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with epistasis showing TCF-1→MAF→RORγt pathway, single lab\",\n      \"pmids\": [\"31142588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TGF-β induces Tfh cell fate in CD4+ T cells through c-Maf; TGF-β-induced CXCR5 expression requires c-Maf but is independent of Bcl6; c-Maf acts as a cell-fate switch between Tfh and Th17 in TGF-β-rich environments.\",\n      \"method\": \"In vitro Tfh differentiation protocol, c-Maf conditional KO, Bcl6 KO comparison, CXCR5 reporter, in vivo validation\",\n      \"journal\": \"Science immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with epistasis (Bcl6 vs. c-Maf) and in vivo validation, multiple orthogonal methods\",\n      \"pmids\": [\"38427718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"FGF signaling upregulates c-Maf expression via an FGF2-responsive element (FRE) in the c-Maf promoter containing AP-1 and Ets-binding sites; c-Jun and Etv5/ERM (nuclear effectors of ERK1/2) bind these regions in lens chromatin; FGF signaling also upregulates αA-crystallin directly and indirectly via c-Maf.\",\n      \"method\": \"ChIP (c-Jun, Etv5/ERM in lens), reporter assay, ERK1/2-deficient lens analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP in native lens chromatin with genetic (ERK KO) confirmation, single lab\",\n      \"pmids\": [\"26719333\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"c-MAF is a basic region/leucine zipper (bZIP) transcription factor that binds MARE sequences as a homodimer or heterodimer (with partners including AhR, NF-AT, SOX9, and CNC/Nrf2 family members) to transactivate tissue-specific target genes including IL-4, IL-10, IL-21, crystallins, cyclin D2, integrin β7, F4/80, ARK5, and Col2a1; its activity and stability are regulated post-translationally by GSK-3-mediated phosphorylation (enhancing transcriptional activity via P/CAF recruitment while triggering ubiquitin-proteasomal degradation), by SUMOylation (which suppresses preferential Il21 transactivation by recruiting Daxx/HDAC2), by polyubiquitination at multiple lysine residues (written by HERC4, erased by Otub1/USP7/USP5), and by lysosomal degradation; upstream, IL-2/STAT5, IL-6/STAT3, TGF-β, and FGF signaling induce c-MAF expression, while p53-dependent miR-34a/miR-145 and the lncRNA linc-MAF-4 (via LSD1/EZH2) repress it; functionally, c-MAF is essential for Th2 IL-4 production, Tr1/Tfh/Th17/Tγδ17/iTreg subset differentiation, macrophage polarization and identity, lens fiber cell differentiation, and liver sinusoidal endothelial cell specification.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"c-MAF is a large Maf-family bZIP transcription factor that functions as a lineage-determining regulator across multiple cell types, directing T helper subset specification (Th2, Tfh, Tr1, Tγδ17, iTreg), macrophage identity and polarization, lens fiber cell differentiation, epidermal progenitor differentiation, and liver sinusoidal endothelial cell specification [PMID:8674125, PMID:10403649, PMID:30538336, PMID:29414937, PMID:35364013, PMID:25805135]. It binds MARE (Maf recognition element) sequences as a homodimer or heterodimer with partners such as AhR, SOX9, and Nrf2, employing a DNA-sequence-dependent conformational change in its basic region that enables recognition of extended GC-flanking sequences distinct from canonical bZIP elements [PMID:11179227, PMID:19797082, PMID:17875642]. c-MAF directly transactivates key target genes—including IL-4, IL-10, IL-21, crystallins, cyclin D2, integrin β7, F4/80, and Csf-1r—and can also remodel chromatin by recruiting Pax6, CREB, Brg1/Snf2h at crystallin loci or by promoting chromatin accessibility at Rorc and Blk loci in γδ T cells [PMID:8674125, PMID:19414776, PMID:20676095, PMID:16675956, PMID:30538336]. Its stability and output are tuned by GSK-3 phosphorylation (which enhances transcriptional activity via P/CAF recruitment while triggering proteasomal degradation), by SUMOylation (which suppresses IL-21 transactivation through Daxx/HDAC2 recruitment), and by ubiquitin-dependent turnover mediated by the E3 ligase HERC4 and opposed by deubiquitinases Otub1, USP7, and USP5 [PMID:18042454, PMID:30059018, PMID:26825710, PMID:32842143, PMID:31822558].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing c-Maf as a T cell transcription factor answered whether a bZIP protein could directly activate the IL-4 promoter, founding the concept that Maf factors control cytokine gene transcription.\",\n      \"evidence\": \"EMSA/footprinting plus reporter and ectopic expression in Th1/B cells\",\n      \"pmids\": [\"8674125\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No in vivo loss-of-function evidence at this stage\", \"Whether c-Maf is sufficient for IL-4 in a physiological context was untested\", \"Mechanism of cooperation with NFAT was not structurally resolved\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Germline knockouts demonstrated that c-Maf is essential in vivo for both IL-4 production in CD4+ T cells and for lens fiber cell differentiation, establishing it as a lineage-determining factor in two unrelated tissues.\",\n      \"evidence\": \"c-maf−/− mice with cytokine measurement and lens histology/crystallin expression analysis\",\n      \"pmids\": [\"10403649\", \"10383433\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Redundancy with MafB in macrophages/other tissues not addressed\", \"Cell-intrinsic versus microenvironmental contributions to T cell phenotype not dissected\", \"Conditional KO needed to exclude developmental versus functional roles\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Biophysical analysis revealed that Maf proteins recognize extended MARE elements through a DNA-sequence-dependent conformational folding mechanism in the basic region, distinguishing them from canonical bZIP factors and explaining their unique target selectivity.\",\n      \"evidence\": \"Secondary structure analysis, trypsin sensitivity, binding affinity/dissociation measurements, and DNA contact mapping\",\n      \"pmids\": [\"11179227\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full crystal structure of c-Maf itself not yet available (MafG structure came later)\", \"How conformational change integrates with heterodimer partners was unknown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Interaction studies with Hox proteins and c-Myb showed that c-Maf's bZIP domain serves as a protein-interaction platform for both cooperative and inhibitory partnerships, broadening the model beyond simple DNA binding.\",\n      \"evidence\": \"Phage display, Co-IP, domain mutagenesis, EMSA, and transformation assays (Hox); Co-IP and differentiation assays (c-Myb)\",\n      \"pmids\": [\"11036080\", \"10477683\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of Hox-bZIP interaction unresolved\", \"Physiological relevance of Hox-Maf antagonism in vivo not tested\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of the c-Maf–SOX9 interaction and synergistic activation of Col2a1 extended c-Maf's role into chondrogenesis and revealed that bZIP–HMG box hetero-partnerships drive cartilage gene expression.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP, GST pull-down, domain mapping, luciferase reporter\",\n      \"pmids\": [\"12381733\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo cartilage phenotype of c-Maf loss not demonstrated\", \"Whether SOX9 interaction is required for all chondrocyte targets unclear\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Discovery that c-MAF transactivates cyclin D2, integrin β7, and ARK5 in myeloma provided the molecular basis for its oncogenic function—driving proliferation, adhesion, and invasion in t(14;16) myeloma.\",\n      \"evidence\": \"ChIP, reporter assays with MARE mutation, dominant-negative inhibition, xenograft tumor model, invasion assay\",\n      \"pmids\": [\"14998494\", \"16044163\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of individual targets to in vivo myeloma progression not dissected\", \"Whether c-MAF-driven myeloma depends on the same ubiquitin regulatory axis was unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"ChIP studies at crystallin loci in lens revealed that c-Maf cooperates with Pax6 and CREB to recruit chromatin remodelers Brg1 and Snf2h, showing it acts as a chromatin organizer, not just a classical transactivator.\",\n      \"evidence\": \"ChIP in lens chromatin, reporter assays in lens explants, transgenic reporter mice\",\n      \"pmids\": [\"16675956\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether c-Maf directly recruits Brg1/Snf2h or does so indirectly was unresolved\", \"Genome-wide chromatin remodeling by c-Maf in lens not profiled\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"GSK-3 phosphorylation was shown to create a dual switch—enhancing c-Maf transcriptional activity via P/CAF coactivator recruitment while simultaneously marking it for ubiquitin-proteasomal degradation—explaining how Maf protein turnover couples to peak transcriptional output.\",\n      \"evidence\": \"In vitro kinase assay, phosphosite mutagenesis, Co-IP with P/CAF, ubiquitination assay\",\n      \"pmids\": [\"18042454\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific E3 ligase recognizing phosphorylated Maf not identified at this point\", \"Whether the same mechanism applies to c-Maf versus MafA in all tissues was unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Structural determination of the MafG–DNA complex and SPR binding studies with Nrf2–MafG heterodimers resolved how Maf basic-region residues (Arg57, Asn61) recognize flanking GC sequences and how a single residue difference (Ala-502 in Nrf2 vs. Tyr in Maf) dictates differential MARE binding specificity.\",\n      \"evidence\": \"X-ray crystallography of MafG–DNA, mutagenesis, surface plasmon resonance-microarray\",\n      \"pmids\": [\"19797082\", \"17875642\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crystal structure of full-length c-Maf or c-Maf homodimer on DNA still lacking\", \"Structural basis of Maf–CNC heterodimer selectivity on endogenous chromatin unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrating that combined MafB and c-Maf deficiency enables macrophage self-renewal (via KLF4/c-Myc upregulation) without dedifferentiation revealed that large Maf factors function as anti-proliferative gatekeepers in terminally differentiated macrophages.\",\n      \"evidence\": \"MafB/c-Maf double-knockout macrophages, shRNA knockdown of KLF4/c-Myc, in vivo transplantation\",\n      \"pmids\": [\"19892988\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the self-renewal phenotype is tumor-prone in vivo was not assessed\", \"Relative individual contributions of MafB versus c-Maf to the anti-proliferative block were not fully separated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"c-Maf was shown to directly transactivate IL-10 via MARE binding in a STAT3-dependent manner during Th17 polarization, and with AhR to co-activate IL-10 and IL-21 for Tr1 cells, expanding its cytokine repertoire beyond IL-4 and linking it to anti-inflammatory T cell programs.\",\n      \"evidence\": \"Retroviral transduction, MARE binding assay, STAT3 KO analysis, AhR Co-IP, reporter assay, EAE model\",\n      \"pmids\": [\"19414776\", \"20676095\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide target overlap between Th2 and Tr1 c-Maf programs not mapped\", \"Whether AhR–c-Maf interaction is direct or bridged by DNA was not structurally resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"ChIP-seq and epistasis experiments established MAF and MAFB as master regulators of epidermal progenitor differentiation, binding upstream of 393 differentiation genes and key TFs (GRHL3, ZNF750, KLF4, PRDM1), while the lncRNA linc-MAF-4 was shown to recruit LSD1/EZH2 to repress MAF transcription in Th1 cells.\",\n      \"evidence\": \"ChIP-seq, RNA-seq, knockdown/overexpression, RIP with LSD1/EZH2, 3C chromatin interaction assay\",\n      \"pmids\": [\"25805135\", \"25621826\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which ANCR/TINCR control MAF/MAFB expression not fully dissected\", \"Whether linc-MAF-4 regulation operates in non-T cell contexts unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identification of HERC4 as the E3 ubiquitin ligase for c-Maf (polyubiquitinating K85 and K297), and USP5 as its opposing deubiquitinase, provided the first defined writer-eraser pair controlling c-Maf stability in myeloma.\",\n      \"evidence\": \"Affinity chromatography/MS, Co-IP, ubiquitination assay with lysine mutagenesis, xenograft model\",\n      \"pmids\": [\"26825710\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HERC4 recognizes GSK-3-phosphorylated c-Maf specifically was not tested\", \"Role of HERC4 in non-myeloma c-Maf-expressing cells unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Conditional knockouts in γδ T cells and Treg cells revealed that c-Maf is a universal fate switch for Tγδ17 commitment (by promoting Rorc chromatin accessibility and antagonizing TCF1) and for RORγt+FOXP3+ iTreg differentiation and IL-10 production, with its loss causing spontaneous colitis.\",\n      \"evidence\": \"Conditional KO in γδ and Treg lineages, ATAC-seq, antigen-specific T cell tracking, colitis scoring\",\n      \"pmids\": [\"30538336\", \"29414937\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct c-Maf binding sites at Rorc locus not mapped by ChIP\", \"Whether c-Maf–TCF1 antagonism involves direct physical interaction or indirect competition was unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"SUMOylation of c-Maf was shown to differentially regulate target gene selection: SUMO modification recruits Daxx/HDAC2 to specifically repress Il21 while sparing other targets, and SUMO-deficient c-Maf preferentially activates Il21 via enhanced CBP/p300-mediated acetylation.\",\n      \"evidence\": \"Transgenic NOD mice expressing WT versus SUMO-mutant c-Maf, ChIP for Daxx/HDAC2/CBP/p300, pharmacological CBP inhibition\",\n      \"pmids\": [\"30059018\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SUMOylation affects other c-Maf targets beyond Il21 was not comprehensively tested\", \"The SUMO E3 ligase responsible for c-Maf SUMOylation in T cells was not identified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Myeloid-specific c-Maf deletion showed it controls M2 macrophage polarization by binding the Csf-1r conserved noncoding sequence and by acting as a metabolic checkpoint regulating the TCA cycle and UDP-GlcNAc biosynthesis, linking transcriptional identity to metabolic programming.\",\n      \"evidence\": \"Myeloid conditional KO, ChIP at Csf-1r, metabolomics, T cell suppression assay, tumor model\",\n      \"pmids\": [\"31945018\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which c-Maf directly controls metabolic enzyme expression not detailed\", \"Whether metabolic effects are cell-autonomous or secondary to Csf-1r regulation was not fully dissected\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of Otub1 and USP7 as additional deubiquitinases that stabilize c-Maf (removing K48-linked chains) completed a multi-enzyme regulatory network controlling c-Maf abundance, particularly in myeloma.\",\n      \"evidence\": \"MS interactome, Co-IP, ubiquitination assays with mutagenesis, xenograft models\",\n      \"pmids\": [\"32842143\", \"31822558\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Hierarchical or redundant relationships among USP5, USP7, and Otub1 not established\", \"Tissue-specific usage of different DUBs for c-Maf regulation unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Endothelium-specific deletion showed c-Maf is a critical postnatal switch for liver sinusoidal endothelial cell identity, with enforced expression sufficient to activate the sinusoidal transcriptional program in generic endothelial cells.\",\n      \"evidence\": \"scRNA-seq, endothelium-specific conditional KO, c-Maf overexpression in human ECs, hepatocyte co-culture\",\n      \"pmids\": [\"35364013\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signals inducing c-Maf specifically in liver sinusoidal endothelium not identified\", \"Direct genomic targets of c-Maf in sinusoidal endothelium not mapped by ChIP-seq\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"TGF-β was shown to induce Tfh fate through c-Maf independently of Bcl6, establishing c-Maf as a cell-fate switch between Tfh and Th17 in TGF-β-rich environments and dissociating the long-assumed Bcl6 requirement for CXCR5 induction.\",\n      \"evidence\": \"In vitro Tfh differentiation, c-Maf and Bcl6 conditional KO comparison, CXCR5 reporter, in vivo validation\",\n      \"pmids\": [\"38427718\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether c-Maf directly binds CXCR5 regulatory elements was not shown\", \"How c-Maf integrates TGF-β and TCR signals to decide between Tfh and Th17 fate at the single-cell level remains unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A comprehensive understanding of how c-Maf selects among its diverse target genes in different lineages—whether through combinatorial partner usage, chromatin context, or post-translational modification state—remains to be integrated into a unified model.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No genome-wide c-Maf ChIP-seq across multiple cell types exists for systematic comparison\", \"Crystal structure of c-Maf homodimer or c-Maf–partner heterodimer on DNA has not been determined\", \"SUMO E3 ligase and site-specific kinase crosstalk in non-myeloma contexts remain uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 7, 8, 9]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 3, 5, 20, 23, 24, 26, 27]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 6, 20, 29]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0074160\", \"supporting_discovery_ids\": [0, 3, 20, 23, 24, 27]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 3, 4, 25, 30, 38]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 22, 23, 27]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [20, 31]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [6, 11, 12, 14]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [5, 34]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"AhR\", \"SOX9\", \"HERC4\", \"Otub1\", \"USP7\", \"USP5\", \"Daxx\", \"Pax6\"],\n    \"other_free_text\": []\n  }\n}\n```"}