{"gene":"MAFB","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":1996,"finding":"MafB physically interacts with Ets-1 via its basic region or leucine-zipper domain (identified by yeast one-hybrid screen with DNA-bound Ets-1), and represses Ets-1 transactivation of synthetic promoters containing Ets binding sites as well as the endogenous transferrin receptor gene, thereby inhibiting erythroid differentiation.","method":"Yeast one-hybrid screen, co-immunoprecipitation/pulldown, transient transfection reporter assays, overexpression in erythroblast cell line with transferrin receptor gene readout","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal interaction identified by yeast screen, mechanism confirmed by reporter assays and functional differentiation readout, multiple orthogonal methods in a highly cited single study","pmids":["8620536"],"is_preprint":false},{"year":1994,"finding":"MafB forms homodimers through its leucine zipper, binds Maf-recognition elements (MAREs), forms heterodimers with v-Maf and Fos but not Jun, and acts as a transcriptional activator of MARE-containing promoters; overexpression transforms chicken embryo fibroblasts.","method":"DNA-binding assays, dimerization assays, transient cotransfection reporter assays, focus formation/transformation assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal biochemical and functional assays in founding characterization paper, widely replicated","pmids":["7935473"],"is_preprint":false},{"year":2000,"finding":"MafB overexpression in transformed chicken hematopoietic myeloblasts drives rapid macrophage differentiation (morphology, surface markers, phagocytic activity, nitric oxide release), while a dominant-negative MafB allele inhibits myeloid colony formation and myeloblast-to-macrophage differentiation, establishing MafB as a specific and essential determinant of the monocytic program.","method":"Retroviral overexpression and dominant-negative allele in transformed chicken hematopoietic precursors, colony assays, morphology, surface marker expression, phagocytosis and NO-release functional assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain-of-function and loss-of-function with multiple orthogonal phenotypic readouts; replicated in multiple subsequent studies","pmids":["10790365"],"is_preprint":false},{"year":2007,"finding":"MafB directly regulates transcription of Pdx1, Nkx6.1, and GLUT2 in developing islet beta-cells, as demonstrated by ChIP showing MafB binding within endogenous control region sequences of these genes; MafB-null embryos have reduced insulin+ and glucagon+ cells with normal total endocrine cell numbers.","method":"MafB knockout mouse analysis, immunohistochemistry, ChIP on endogenous gene control regions","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout phenotype with direct ChIP evidence for target gene binding, multiple orthogonal methods","pmids":["17360442"],"is_preprint":false},{"year":2006,"finding":"MafB negatively regulates RANKL-induced osteoclast differentiation: MafB proteins physically interfere with the DNA-binding ability of c-Fos, Mitf, and NFATc1, inhibiting their transactivation of NFATc1 and OSCAR; overexpression blocks TRAP+ multinuclear osteoclast formation while retaining phagocytic activity; RNAi knockdown of MafB enhances osteoclastogenesis.","method":"Overexpression and RNAi in bone marrow-derived monocyte/macrophage cells, TRAP staining, reporter assays, DNA-binding interference assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain-of-function and loss-of-function, mechanistic DNA-binding interference demonstrated, multiple orthogonal methods","pmids":["17158225"],"is_preprint":false},{"year":2007,"finding":"SUMO-1 modifies MafB in vitro and in vivo at lysines K32 and K297. SUMOylation reduces MafB-driven transactivation and macrophage differentiation potential; SUMOylation-deficient MafB (K32R K297R) resists v-Myb-mediated repression and can drive macrophage differentiation even in the presence of active Myb. Direct repression of MafB transactivation by v-Myb is strictly dependent on MafB SUMO modification.","method":"In vitro SUMOylation assay, site-directed mutagenesis (K32R K297R), inducible Myb alleles, macrophage differentiation assays, transactivation reporter assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro SUMOylation assay plus mutagenesis plus functional differentiation readout, single lab with multiple orthogonal methods","pmids":["17548468"],"is_preprint":false},{"year":2009,"finding":"Combined deficiency of MafB and c-Maf enables self-renewal of mature monocytes and macrophages without loss of differentiated phenotype; this continuous proliferation requires concomitant upregulation of pluripotent stem cell factors KLF4 and c-Myc, as shown by shRNA inactivation.","method":"MafB/c-Maf double-knockout, shRNA knockdown of KLF4 and c-Myc, in vitro expansion, transplantation assays","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic double-knockout combined with shRNA epistasis and in vivo transplantation, multiple orthogonal methods","pmids":["19892988"],"is_preprint":false},{"year":2009,"finding":"MafB specifically restricts M-CSF-mediated myeloid commitment divisions in hematopoietic stem cells (HSCs); MafB deficiency enhances HSC sensitivity to M-CSF and activates PU.1 in HSCs in vivo; single-cell analysis shows reduced MafB enables M-CSF to instruct asymmetric divisions producing PU.1+ progeny; competitive repopulation advantage is PU.1 and M-CSF-receptor dependent.","method":"MafB-deficient mouse model, single-cell analysis, competitive repopulation assays, serial transplantation, in vivo M-CSF receptor signaling analysis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse with single-cell analysis, epistasis with PU.1 and M-CSFR, serial transplantation, multiple orthogonal methods","pmids":["19632180"],"is_preprint":false},{"year":2004,"finding":"PU.1 directly binds MafB protein, inhibits its transcriptional activity in macrophages, and represses its ability to induce macrophage differentiation; high PU.1 activity favors DC fate by inhibiting both expression and activity of MafB, while constitutive MafB expression inhibits DC differentiation.","method":"Activated transcription factors in transformed myeloid progenitors, direct protein binding assay between PU.1 and MafB, reporter assays for transcriptional activity, DC/macrophage differentiation assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding demonstrated, gain-of-function experiments, multiple cell systems and readouts","pmids":["15598817"],"is_preprint":false},{"year":2004,"finding":"ERK signaling induces MafB/Kreisler expression during megakaryocyte differentiation; MafB synergizes with GATA and Ets factors to enhance transcription from the GPIIb (CD41) proximal promoter; dominant-negative or antisense suppression of MafB inhibits ERK-dependent GPIIb transactivation.","method":"ERK activation assays, dominant-negative and antisense MafB constructs, luciferase reporter assays with GPIIb promoter, cotransfection with GATA/Ets","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function and reporter assays, single lab, two orthogonal methods","pmids":["15121870"],"is_preprint":false},{"year":2006,"finding":"MafB is essential for podocyte differentiation and renal tubule survival; MafB-null mice show renal dysgenesis with abnormal podocyte differentiation, tubular apoptosis, and suppressed F4/80 expression in nonadherent macrophages; F4/80 expression is directly regulated by MafB in hematopoietic cells.","method":"mafB/GFP knock-in null mutant mouse, histology, immunofluorescence, primary culture of fetal liver hematopoietic cells","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse with direct GFP knock-in reporter, primary cell culture confirmation, multiple tissue phenotypes analyzed","pmids":["16847325"],"is_preprint":false},{"year":2002,"finding":"MafB/Kreisler is essential for cellular differentiation of glomerular visceral epithelial cells (podocytes); homozygous kr(enu) mice develop proteinuria, foot process fusion/effacement, and reduced Podocin and Nephrin levels; MafB acts downstream of Pod1 bHLH transcription factor during the capillary loop to mature stage transition.","method":"kr(enu) homozygous mouse model, histology, proteinuria measurement, electron microscopy of podocyte foot processes, gene expression analysis, epistasis with Pod1","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — knockout phenotype with epistasis placement downstream of Pod1, multiple structural and molecular readouts","pmids":["12217315"],"is_preprint":false},{"year":2011,"finding":"MafB interacts directly with Gcm2 to synergistically activate PTH gene expression; MafB is required for parathyroid separation from the thymus and migration toward the thyroid; MafB deficiency impairs PTH expression and secretion, reduces renal cyp27b1 expression, and reduces bone mineralization.","method":"MafB knockout mouse, co-immunoprecipitation of MafB and Gcm2, luciferase reporter assay for PTH promoter, histology, serum PTH/calcium measurements","journal":"Journal of bone and mineral research","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct protein-protein interaction by Co-IP, reporter assays, knockout phenotype with multiple functional readouts","pmids":["21713993"],"is_preprint":false},{"year":2014,"finding":"MafB mediates oxidized LDL-activated LXR/RXR-induced expression of apoptosis inhibitor of macrophages (AIM) in foam cells; without MafB, activated LXR/RXR fails to induce AIM expression; Mafb-deficient macrophages are prone to apoptosis and haematopoietic reconstitution with Mafb-deficient cells reduces early atherogenic lesion.","method":"Mafb-deficient mouse, hematopoietic reconstitution in LDL receptor-deficient mice, foam cell apoptosis assays, LXR/RXR activation experiments, gene expression analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo haematopoietic reconstitution, mechanistic LXR/RXR→MafB→AIM pathway, multiple orthogonal methods","pmids":["24445679"],"is_preprint":false},{"year":2017,"finding":"MafB is a critical transcriptional regulator of complement component C1q in macrophages; Mafb-deficient macrophages have reduced C1q expression and impaired efferocytosis; efferocytosis defect can be rescued by wild-type but not C1q-deficient mouse serum; MafB overexpression induces C1q-dependent gene expression; Mafb deficiency increases glomerular autoimmunity.","method":"Mafb-deficient mouse, hemolysis assay for classical complement pathway, efferocytosis rescue experiments with serum from WT vs C1q-deficient mice, MafB overexpression, immunohistochemistry","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including rescue experiment, functional complement assay, overexpression and knockout in same study","pmids":["29167450"],"is_preprint":false},{"year":2015,"finding":"MLL3 and MLL4 histone H3K4 methyltransferase complexes physically bind MAFB (and closely related MAFA) in islet beta-cells; MAFB was found in ~1.5 MDa MLL3/MLL4 complexes by size fractionation; knockdown of NCOA6 (core MLL3/4 subunit) reduces expression of MAFA and MAFB target genes in mouse and human beta-cell lines.","method":"Unbiased in-cell biochemical pulldown plus mass spectrometry, size-fractionation of beta-cell extracts, NCOA6 knockdown in mouse and human beta-cell lines, gene expression analysis","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mass spectrometry-confirmed interaction, size-fractionation biochemistry, functional knockdown, single lab with multiple orthogonal methods","pmids":["26180087"],"is_preprint":false},{"year":2009,"finding":"TFE3 transcription factor directly transactivates the MAFB promoter through an E-box element conserved across mammalian species; EMSA identified the TFE3-binding site in the MAFB promoter; deletion or mutation of this E-box prevents TFE3-driven transactivation; TFE3 overexpression highly induces MAFB in human hematopoietic cells undergoing macrophage differentiation.","method":"EMSA with MAFB promoter E-box probe, luciferase reporter assay with E-box deletion/mutation constructs, TFE3 retroviral overexpression and siRNA knockdown in human hematopoietic cells","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA plus reporter assay plus functional overexpression, single lab, two orthogonal methods","pmids":["19332055"],"is_preprint":false},{"year":2008,"finding":"Vitamin D3 induces monocyte differentiation via a sequential transactivation cascade: VDR → Hox-A10 → MafB; Hox-A10 directly binds to the MafB promoter (demonstrated by EMSA and luciferase assay) and upregulates MafB expression, which in turn drives monocyte differentiation of CD34+ hematopoietic progenitors.","method":"Retroviral Hox-A10 transduction of CD34+ progenitors, EMSA with MafB promoter probe, luciferase reporter assay, vitamin D3 stimulation with RT-PCR for Hox-A10 and MafB","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding by EMSA plus reporter assay, functional monocyte differentiation readout, single lab","pmids":["18832725"],"is_preprint":false},{"year":2000,"finding":"The mouse mafB gene promoter contains Hox-A10-binding palindromic MARE/E-box elements and GC-boxes; the gene is positively auto-regulated by MafB itself (cotransfection assay); MyoD activates the mafB promoter; the gene lacks intron structure.","method":"Genomic cloning, RNase protection for transcription start site mapping, transient transfection luciferase reporter assays with 5'-flanking region deletions/mutations","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assays with promoter constructs and cotransfection, single lab, two orthogonal methods (functional and sequence analysis)","pmids":["10721736"],"is_preprint":false},{"year":2003,"finding":"In the developing chick hindbrain, MafB exhibits positive autoregulatory activity, represses Hoxb1 expression, and can synergize with or antagonize Krox20 activity in a spatially restricted manner; the kreisler mutation also causes ectopic MafB activation in rhombomere 3.","method":"Gain-of-function electroporation in chick embryo hindbrain, re-analysis of kreisler mutant mice, in situ hybridization","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function in vivo experiments with multiple gene expression readouts, single lab","pmids":["12490204"],"is_preprint":false},{"year":2000,"finding":"FGF signaling regulates MafB/kr expression in the hindbrain; exogenous FGFs induce ectopic mafB/kr expression while an FGF signaling inhibitor specifically downregulates mafB/kr in the hindbrain neuroepithelium and neural crest.","method":"Exogenous FGF protein application to chick neural tube, FGF signaling inhibitor treatment, in situ hybridization for mafB/kr","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function and loss-of-function FGF manipulation with gene expression readout, single study","pmids":["11044406"],"is_preprint":false},{"year":1998,"finding":"MafB/Kr expression in rhombomeres 5/6 is regulated by a posteriorizing signal present in posterior somites; retinoic acid mimics this effect, repressing MafB/Kr in r5/6 and inducing it more rostrally in a concentration-dependent manner, indicating that a threshold concentration of a posteriorizing morphogen (retinoic acid or related signal) defines the MafB/Kr expression domain.","method":"Quail/chick chimera grafting of rhombomeres and somites, retinoic acid bead implantation, in situ hybridization for MafB/Kr","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo grafting experiments with retinoic acid bead manipulation, multiple positional tests, single lab","pmids":["9477316"],"is_preprint":false},{"year":2014,"finding":"In developing chick limb buds, MafB/cFos heterodimers repress apoptosis while MafB/cJun heterodimers promote apoptosis; MafB and cJun directly activate expression of p63 and p73 (cell cycle arrest components) as demonstrated by ChIP-seq in chick limb buds.","method":"ChIP-seq in chick limb buds, gain-of-function overexpression of MafB/cFos and MafB/cJun heterodimers, apoptosis quantification, functional promoter analysis of p63 and p73","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq for direct target binding plus functional heterodimer experiments, single lab","pmids":["25005477"],"is_preprint":false},{"year":2016,"finding":"MAFB is necessary and sufficient for epidermal progenitor differentiation; MAF:MAFB regulates ~393 genes in epidermis; ANCR and TINCR lncRNAs act as upstream regulators of MAF:MAFB; ChIP-seq showed MAF:MAFB binding to epidermal differentiation TF genes (GRHL3, ZNF750, KLF4, PRDM1) whose expression they control; these downstream TFs rescue specific MAF:MAFB target gene subsets upon MAF:MAFB loss.","method":"Kinetic transcriptome analysis, ChIP-seq, lncRNA knockdown (ANCR, TINCR), TF rescue experiments, gain-of-function and loss-of-function of MAF/MAFB","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq for genome-wide binding, necessity/sufficiency experiments, epistasis established by rescue assays, multiple orthogonal methods","pmids":["25805135"],"is_preprint":false},{"year":2016,"finding":"Androgen receptor (AR) signaling is required for Mafb expression in male genital tubercle mesenchyme; two functional androgen response elements (AREs) were identified in the Mafb 3'UTR and shown to bind AR; β-catenin also regulates Mafb expression during urethral masculinization; Mafb KO male mice exhibit defective embryonic urethral formation.","method":"Mafb KO mouse, AR KO mouse, exogenous androgen treatment, luciferase reporter assay with Mafb 3'UTR AREs, ChIP for AR binding at 3'UTR AREs, immunohistochemistry","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct AR binding to Mafb 3'UTR by ChIP plus reporter assay, KO phenotype, single lab","pmids":["26636186"],"is_preprint":false},{"year":2009,"finding":"C/EBPβ isoform ratio regulates osteoclastogenesis through MafB: the long transactivating LAP isoform promotes MafB promoter activity and MafB gene expression (attenuating osteoclastogenesis), while the short repressive LIP isoform reduces MafB; rapamycin (mTOR inhibitor) increases LAP/LIP ratio and inhibits osteoclastogenesis via MafB in a C/EBPβ-dependent manner.","method":"C/EBPβ null and LIP knock-in mouse osteoclast precursors, rapamycin treatment, MafB promoter reporter assays with LAP and LIP constructs, qRT-PCR for MafB expression","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple mouse genetic models, direct promoter reporter assays, functional osteoclastogenesis readout, single lab","pmids":["19440205"],"is_preprint":false},{"year":2014,"finding":"MafB directly regulates Nephrin transcription in podocytes (shown by reporter assay); podocyte-specific MafB overexpression in diabetic mice ameliorates albuminuria and preserves Nephrin expression; Mafb overexpression also upregulates glutathione peroxidase and enhances Notch2 expression in podocytes.","method":"Podocyte-specific MafB transgenic mice with streptozotocin-induced diabetes, luciferase reporter assay for Nephrin promoter, histology, urine/serum biochemistry","journal":"Journal of the American Society of Nephrology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct reporter assay for Nephrin regulation, in vivo transgenic rescue, single lab","pmids":["24722438"],"is_preprint":false},{"year":2014,"finding":"MafB is a downstream target of the IL-10/STAT3 signaling pathway in macrophages; IL-10-activated STAT3 induces MafB, which in turn directly activates MMP9 and IL-7R gene transcription through MARE elements in their promoters (demonstrated by EMSA and luciferase reporter assay).","method":"MafB inactivation and overexpression in human primary macrophages, EMSA with MMP9 and IL-7R promoter MARE probes, luciferase reporter assay, IL-10/STAT3 pathway inhibition","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct DNA binding by EMSA plus reporter assay plus gain/loss-of-function in primary cells, single lab","pmids":["24472656"],"is_preprint":false},{"year":2017,"finding":"MAFB knockdown impairs acquisition of the anti-inflammatory profile of human M-CSF-driven macrophages and establishes the MAFB-dependent gene signature; macrophages from patients with multicentric carpotarsal osteolysis (caused by MAFB mutations) show skewed polarization, validating the MAFB anti-inflammatory role in human disease.","method":"MAFB siRNA knockdown in human monocyte-derived macrophages, gene expression profiling, functional polarization assays, analysis of patient macrophages with MAFB mutations","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function in primary human cells confirmed by human disease mutation, multiple readouts, single lab","pmids":["28093525"],"is_preprint":false},{"year":2022,"finding":"MAFB acts in synergy with glucocorticoid receptor (GR) to drive tolerogenic DC differentiation; GR and MAFB both interact with methylcytosine dioxygenase TET2 and bind to genomic loci that undergo specific demethylation in tolDCs; MAFB knockdown erases tolerogenic properties of tolDCs, reverses specific DNA demethylation, and reverts MAFB-dependent gene upregulation.","method":"Transcriptomic and epigenomic analysis, MAFB knockdown in human DCs, Co-IP of GR, MAFB, and TET2, ChIP for genomic binding, bisulfite sequencing for DNA methylation","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP demonstrating ternary complex with TET2, loss-of-function, epigenomic readout, single lab with multiple orthogonal methods","pmids":["34893889"],"is_preprint":false},{"year":2018,"finding":"MAFB enhances oncogenic Notch1 signaling in T-ALL by binding ETS2 and recruiting acetyltransferases PCAF and P300; MAFB and ETS2 synergistically enhance Notch1 signaling; MAFB knockdown reduces Notch1 target genes MYC and HES1 expression and impairs T-ALL growth.","method":"Gain-of-function screen in mouse T-ALL models, Co-IP for MAFB-ETS2 and MAFB-PCAF/P300 interactions, MAFB knockdown in mouse and human T-ALL cells, Notch target gene expression analysis","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct protein-protein interaction by Co-IP (MAFB-ETS2, MAFB-PCAF/P300), loss-of-function, in vivo mouse T-ALL model, multiple orthogonal methods","pmids":["29138297"],"is_preprint":false},{"year":2016,"finding":"SUMOylation of MAFB at lysine 32 by SUMO1 is critical for cell cycle regulation in colorectal cancer cells; SUMOylated MAFB directly binds the CDK6 promoter to regulate CDK6 transcription; MAFB knockdown blocks CRC cell proliferation by G0/G1 arrest; K32-mutant MAFB (non-SUMOylatable) shows reduced tumorigenic capacity in xenografts.","method":"SUMO1 SUMOylation assay, ChIP for MAFB binding to CDK6 promoter, shRNA knockdown, cell cycle analysis, K32 mutation, xenograft mouse model","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct ChIP for CDK6 promoter binding, mutagenesis of SUMOylation site, in vivo xenograft, single lab","pmids":["27829226"],"is_preprint":false},{"year":2018,"finding":"GSK3β activity and proteasome activity regulate MAFb protein stability (not mRNA level); inhibition of GSK3β or treatment with proteasome inhibitors (bortezomib, carfilzomib) prevents MAFb protein degradation; MAFb is constitutively degraded by the ubiquitin/proteasome system, and high MAFb protein confers resistance to proteasome inhibitors in multiple myeloma cells.","method":"GSK3β inhibitor treatment, proteasome inhibitor treatment, immunoblotting for MAFb protein vs mRNA, MAFb silencing by lentiviral knockdown, apoptosis/caspase activation assays","journal":"BMC cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological dissection of GSK3 and proteasome roles in MAFb stability, knockdown with functional rescue, single lab","pmids":["29980194"],"is_preprint":false},{"year":2018,"finding":"MafB is a critical transcriptional regulator of glucagon production and secretion in adult mouse alpha-cells; endocrine cell-specific and tamoxifen-inducible MafB knockout mice show decreased Arx+glucagon+ cells and glucagon content; MafB regulates Arx expression; MafB-null islets fail to respond to arginine due to impaired arginine transporter gene expression.","method":"Conditional and inducible MafB knockout mice, immunohistochemistry, gene expression analysis, glucagon secretion assays with arginine challenge","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple conditional KO models (cell-type specific and inducible), functional secretion assays, multiple gene expression readouts","pmids":["29378833"],"is_preprint":false},{"year":2015,"finding":"MAFB is rapidly induced and activated by VEGF-C/VEGFR-3 signaling in lymphatic endothelial cells (LECs); MAFB induces PROX1 expression and other markers of differentiated LECs; Mafb-null embryos show impaired lymphatic patterning in the skin.","method":"CAGE RNA-seq for VEGF-C-induced transcriptional changes in LECs, Mafb global knockout mouse analysis of lymphatic patterning, MAFB knockdown in LECs","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CAGE-seq pathway activation combined with KO phenotype, single lab","pmids":["26549461"],"is_preprint":false},{"year":2020,"finding":"Lymphatic endothelial cell (LEC)-intrinsic MAFB controls lymphatic vascular morphogenesis; conditional lymphatic-specific Mafb knockout produces embryonic lymphatic patterning defects and increased branching postnatally; loss of lymphatic MAFB enhances tumor-induced lymphangiogenesis.","method":"Conditional lymphatic-specific Mafb knockout (Cre-lox), histological analysis of lymphatic vessels, tumor lymphangiogenesis model","journal":"Angiogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific conditional KO establishing cell-intrinsic function, multiple developmental and pathological contexts, single lab","pmids":["32307629"],"is_preprint":false},{"year":2021,"finding":"PGE2-mediated EP4 receptor activation induces MafB expression in kidney macrophages following acute injury; myeloid Mafb deletion recapitulates myeloid COX-2 or EP4 deletion, with delayed recovery, persistent pro-inflammatory macrophages, and increased kidney fibrosis; MafB upregulates anti-inflammatory genes and suppresses pro-inflammatory genes downstream of COX-2/PGE2/EP4.","method":"Myeloid-specific COX-2 KO, EP4 KO, and MafB KO mice, acute kidney injury model, macrophage phenotyping, gene expression analysis","journal":"Kidney international","confidence":"High","confidence_rationale":"Tier 2 / Strong — three parallel myeloid-specific KO models with epistasis establishing COX-2→PGE2→EP4→MafB pathway, consistent phenotypes across models","pmids":["34774558"],"is_preprint":false},{"year":2023,"finding":"MafB controls the transition from Ly6C+ monocyte local proliferation to interstitial macrophage (IM) subset specification in the lung; MafB-deficient monocytes fail to properly differentiate into IMs after niche engraftment; c-Maf specifically regulates CD206+ IM subset identity.","method":"Inducible lung IM niche depletion/refilling model, time-course single-cell RNA-seq, bone marrow chimeras, MafB conditional gene targeting","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO combined with scRNA-seq and bone marrow chimera system, multiple orthogonal methods from a rigorous study","pmids":["36928411"],"is_preprint":false},{"year":2023,"finding":"MafB sustains p62 expression in macrophages to inhibit NLRP3 inflammasome activation; MafB knockdown/knockout markedly enhances NLRP3 (but not NLRP1, NLRC4, or AIM2) inflammasome activation; MafB inhibits mitochondrial damage and mitochondrial ROS production; LPS-induced MafB downregulation accelerates NLRP3 activation; myeloid MafB-deficient mice show increased systemic IL-1β.","method":"MafB KO and knockdown macrophages, NLRP3 inflammasome activation assays, p62 expression analysis, mitochondrial ROS measurement, myeloid-specific MafB KO mice with in vivo LPS/P. aeruginosa challenge","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanistic pathway (MafB→p62→mitophagy→NLRP3) established with KO, knockdown, pharmacological induction, in vitro and in vivo, multiple orthogonal methods","pmids":["37845329"],"is_preprint":false},{"year":2018,"finding":"MafB acts as a transcriptional regulator of Sox10 expression specifically in the cardiac neural crest; loss of MafB function in chick cardiac neural crest reduces Sox10 expression without affecting other neural crest subpopulations.","method":"Transcriptome analysis of isolated cardiac neural crest, functional MafB knockdown in chick cardiac neural crest, in situ hybridization for Sox10","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional knockdown with specific gene expression readout in pure isolated cell population, single lab","pmids":["30236445"],"is_preprint":false},{"year":2016,"finding":"PRLR signaling in maternal beta-cells during pregnancy is required for transient gestational MafB expression; conditional beta-cell-specific PRLR deletion abolishes gestational MafB induction; beta-cell-specific MafB deletion produces gestational diabetes mellitus with inadequate beta-cell expansion and failure to induce PRLR-dependent proliferation genes.","method":"Floxed Prlr conditional KO, MafB conditional beta-cell KO, pregnancy model, beta-cell mass quantification, gene expression analysis (Foxm1, cyclins, Tph1, serotonin)","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two conditional KO models establishing PRLR→MafB pathway in beta-cells, functional GDM phenotype, single lab","pmids":["27217483"],"is_preprint":false},{"year":2019,"finding":"Maf and Mafb repress SST+ interneuron generation from MGE secondary progenitors; postnatal conditional deletion shows distinct roles of Mafb (morphological maturation) vs c-Maf in cortical interneuron development; Maf and Mafb positively regulate Mef2c and Snap25 to drive interneuron morphological maturation.","method":"Conditional MGE-specific single and double Mafb/c-Maf knockout mice, single-cell gene expression analysis, electrophysiology, morphological analysis","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with epistasis to Mef2c/Snap25, multiple developmental phenotypes, single lab","pmids":["30699346"],"is_preprint":false},{"year":2017,"finding":"MafB directly up-regulates key cellular mediators of cholesterol efflux from macrophage foam cells; MafB promotes macrophage M2 polarization; MafB expression is up-regulated by metabolic/immunological stimuli that promote M2 polarization or cholesterol efflux; MafB is downregulated by miR-155 and miR-33.","method":"MafB overexpression and knockdown in macrophages, cholesterol efflux assays, M2 marker expression, systems biology analysis of MafB target genes","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function and loss-of-function with functional cholesterol efflux readout, single lab","pmids":["28790455"],"is_preprint":false}],"current_model":"MAFB is a bZIP transcription factor that homodimerizes via its leucine zipper to bind Maf-recognition elements (MAREs), heterodimerizes with Fos (but not Jun), physically interacts with transcription factors including Ets-1, Gcm2, PU.1, ETS2, and the MLL3/4 methyltransferase complexes, and is post-translationally regulated by SUMO modification (at K32/K297) and ubiquitin/proteasome-dependent degradation (stabilized by GSK3β inhibition); it acts as a master regulator of monocyte/macrophage differentiation and anti-inflammatory polarization, drives alpha-cell glucagon production, contributes to islet beta-cell maturation during development, controls podocyte differentiation and renal integrity, regulates parathyroid development and PTH expression in cooperation with Gcm2, shapes hindbrain segmentation via retinoic acid-dependent positional signals, governs lymphatic endothelial identity downstream of VEGF-C/VEGFR-3, and negatively regulates the NLRP3 inflammasome by sustaining p62/mitophagy in macrophages."},"narrative":{"mechanistic_narrative":"MAFB is a bZIP transcription factor that homodimerizes through its leucine zipper to bind Maf-recognition elements (MAREs) and heterodimerizes selectively with Fos but not Jun, acting as a context-dependent transcriptional activator on MARE-containing promoters [PMID:7935473]. It functions as a master determinant of the monocyte/macrophage program: forced expression drives myeloblasts into mature macrophages while a dominant-negative allele blocks the monocytic fate [PMID:10790365], and within hematopoietic stem cells MAFB restrains M-CSF-driven myeloid commitment by antagonizing PU.1, which itself directly binds MAFB to inhibit its activity [PMID:19632180, PMID:15598817]. MAFB output is tuned by a network of upstream inputs—TFE3, vitamin D3/Hox-A10, C/EBPβ isoform ratio, IL-10/STAT3, PGE2/EP4, and positive autoregulation—that converge on its promoter and protein level [PMID:19332055, PMID:18832725, PMID:19440205, PMID:24472656, PMID:34774558, PMID:10721736]. In differentiated macrophages MAFB enforces an anti-inflammatory, tissue-repair phenotype: it directly drives complement C1q to enable efferocytosis [PMID:29167450], promotes M2 polarization and cholesterol-efflux machinery [PMID:28790455], sustains p62 to suppress NLRP3 inflammasome activation through mitophagy [PMID:37845329], and is required for monocyte-to-interstitial-macrophage specification [PMID:36928411]. Beyond myeloid cells, MAFB is an essential developmental and homeostatic regulator: it controls podocyte differentiation and renal integrity by directly activating Nephrin and related genes [PMID:16847325, PMID:12217315, PMID:24722438], cooperates with Gcm2 to drive PTH expression and parathyroid morphogenesis [PMID:21713993], governs pancreatic alpha-cell glucagon production via Arx and islet beta-cell gene programs through ChIP-defined targets Pdx1, Nkx6.1 and GLUT2 [PMID:29378833, PMID:17360442], and establishes lymphatic endothelial identity downstream of VEGF-C/VEGFR-3 by inducing PROX1 [PMID:26549461, PMID:32307629]. MAFB activity is modulated post-translationally by SUMOylation at K32/K297, which dampens transactivation and gates v-Myb repression [PMID:17548468], and by GSK3β- and proteasome-dependent turnover [PMID:29980194]. MAFB also partners with chromatin and signaling factors—the MLL3/4 H3K4 methyltransferase complex in beta-cells [PMID:26180087], TET2 with the glucocorticoid receptor in tolerogenic dendritic cells [PMID:34893889], and ETS2 with PCAF/P300 to amplify oncogenic Notch1 signaling in T-ALL [PMID:29138297]. Loss-of-function MAFB mutations cause multicentric carpotarsal osteolysis and skew human macrophage polarization [PMID:28093525].","teleology":[{"year":1994,"claim":"Established the fundamental biochemistry of MAFB—how it recognizes DNA and chooses dimerization partners—defining it as a bZIP transcriptional activator with oncogenic potential.","evidence":"DNA-binding, dimerization, reporter, and transformation assays in fibroblasts","pmids":["7935473"],"confidence":"High","gaps":["Did not establish physiological target genes or in vivo function","Partner selectivity (Fos vs Jun) consequences not yet linked to a cellular program"]},{"year":1996,"claim":"Showed MAFB acts not only through MAREs but by direct protein interference with another transcription factor, repressing Ets-1 to block erythroid differentiation, revealing a dual transactivator/repressor mode.","evidence":"Yeast one-hybrid screen, co-IP, reporter assays, erythroblast differentiation readout","pmids":["8620536"],"confidence":"High","gaps":["Mechanism of interaction domain not fully resolved","Relevance to native erythropoiesis in vivo untested"]},{"year":2000,"claim":"Defined MAFB as a specific and essential instructor of the macrophage fate, moving it from a biochemical entity to a lineage master regulator.","evidence":"Retroviral gain-of-function and dominant-negative in chicken myeloid precursors with morphology, marker, phagocytosis and NO readouts","pmids":["10790365"],"confidence":"High","gaps":["Direct transcriptional targets driving the macrophage program not identified","Did not address mammalian HSC-level regulation"]},{"year":2004,"claim":"Identified PU.1 as a direct MAFB-binding antagonist and ERK as an inducer, placing MAFB within signaling-controlled fate-choice circuits in myeloid and megakaryocytic lineages.","evidence":"Direct binding assays, reporter assays, DC/macrophage and megakaryocyte differentiation systems","pmids":["15598817","15121870"],"confidence":"High","gaps":["Stoichiometry and structural basis of PU.1-MAFB interaction unresolved","ERK-to-MAFB induction mechanism indirect (Medium-confidence megakaryocyte arm)"]},{"year":2006,"claim":"Extended the protein-interference mechanism to bone, showing MAFB blocks osteoclastogenesis by binding and disabling c-Fos, Mitf and NFATc1, while C/EBPβ isoform ratio and mTOR set MAFB levels upstream.","evidence":"Gain/loss-of-function in marrow macrophages, DNA-binding interference, reporter assays; C/EBPβ-null and LIP knock-in mice with rapamycin","pmids":["17158225","19440205"],"confidence":"High","gaps":["Whether interference is competitive DNA occupancy or sequestration not fully dissected","C/EBPβ regulation single-lab (Medium)"]},{"year":2007,"claim":"Demonstrated MAFB is post-translationally gated by SUMOylation at K32/K297, which restrains transactivation and is the obligate substrate for v-Myb repression, adding a regulatory layer over its differentiation activity.","evidence":"In vitro SUMOylation, K32R/K297R mutagenesis, inducible Myb, differentiation and reporter assays","pmids":["17548468"],"confidence":"High","gaps":["SUMO E3 ligase and deSUMOylating enzyme unidentified","Physiological signals controlling MAFB SUMO state unknown"]},{"year":2007,"claim":"Provided direct ChIP evidence that MAFB binds endocrine pancreas genes (Pdx1, Nkx6.1, GLUT2), establishing it as a developmental regulator of islet beta-cell gene programs.","evidence":"MafB knockout mouse, immunohistochemistry, ChIP on endogenous control regions","pmids":["17360442"],"confidence":"High","gaps":["Did not separate developmental from adult beta-cell requirements","Functional consequence on insulin secretion not fully resolved"]},{"year":2009,"claim":"Revealed that MAFB (with c-Maf) enforces terminal differentiation by suppressing self-renewal, and that it restrains HSC myeloid commitment via PU.1, linking lineage choice to proliferative arrest.","evidence":"MafB/c-Maf double-KO with KLF4/c-Myc shRNA epistasis; MafB-deficient single-cell HSC analysis, competitive repopulation and serial transplantation","pmids":["19892988","19632180"],"confidence":"High","gaps":["How MAFB transcriptionally represses KLF4/c-Myc not defined","Direct vs indirect control of M-CSFR sensitivity unresolved"]},{"year":2002,"claim":"Identified MAFB as essential for podocyte maturation downstream of Pod1, establishing a non-hematopoietic developmental role and a basis for glomerular disease.","evidence":"kr(enu) mouse, proteinuria, EM of foot processes, Podocin/Nephrin analysis, Pod1 epistasis; mafB/GFP knock-in null with renal and macrophage phenotypes","pmids":["12217315","16847325"],"confidence":"High","gaps":["Direct podocyte target genes not yet defined at this stage","Tubular apoptosis mechanism unclear"]},{"year":2011,"claim":"Showed MAFB cooperates physically with Gcm2 to drive PTH expression and is required for parathyroid morphogenesis, defining a tissue-specific transcriptional partnership.","evidence":"MafB KO mouse, Co-IP of MafB and Gcm2, PTH promoter reporter, serum PTH/calcium","pmids":["21713993"],"confidence":"High","gaps":["Interaction interface and DNA co-occupancy not structurally defined","Broader parathyroid target set unmapped"]},{"year":2014,"claim":"Defined MAFB as the macrophage effector of multiple homeostatic and anti-atherogenic programs—LXR/RXR→AIM survival, podocyte Nephrin protection, and IL-10/STAT3→MMP9/IL-7R—showing direct MARE-mediated target activation in disease contexts.","evidence":"Mafb-deficient mice with hematopoietic reconstitution, foam-cell apoptosis assays, podocyte-specific transgenics in diabetes, EMSA/reporter on MMP9 and IL-7R promoters; limb-bud ChIP-seq for Fos/Jun heterodimer-dependent p63/p73","pmids":["24445679","24722438","24472656","25005477"],"confidence":"High","gaps":["Several arms single-lab (Medium)","How partner choice (Fos vs Jun) is set in vivo not resolved","Direct vs indirect target distinctions vary by study"]},{"year":2015,"claim":"Connected MAFB to chromatin-modifying machinery and a new lineage—showing it associates with MLL3/4 H3K4 methyltransferase complexes in beta-cells and is induced by VEGF-C to drive lymphatic PROX1 identity.","evidence":"Mass-spec pulldown and size fractionation of MLL3/4 complexes with NCOA6 knockdown; CAGE-seq of VEGF-C-induced LECs with Mafb-null lymphatic phenotype","pmids":["26180087","26549461"],"confidence":"High","gaps":["Whether MAFB recruits MLL3/4 to specific loci genome-wide not shown","VEGF-C-to-MAFB induction mechanism (Medium) indirect"]},{"year":2016,"claim":"Demonstrated MAFB necessity/sufficiency for epidermal differentiation and direct hormonal/lncRNA control of its expression, broadening it to a general epithelial and developmental differentiation regulator.","evidence":"Epidermal ChIP-seq with ANCR/TINCR knockdown and TF rescue; AR ChIP on Mafb 3'UTR AREs with KO genital phenotype; PRLR-conditional KO linking gestational beta-cell MafB; SUMO-K32→CDK6 in colorectal cancer","pmids":["25805135","26636186","27217483","27829226"],"confidence":"High","gaps":["Tissue-specific cofactor logic distinguishing epidermal vs other programs not unified","SUMO/CDK6 and PRLR arms single-lab (Medium)"]},{"year":2018,"claim":"Identified MAFB as a protein-stability-regulated oncogenic cofactor—stabilized by GSK3β inhibition/proteasome blockade and partnering with ETS2/PCAF/P300 to amplify Notch1 in T-ALL—linking its turnover to cancer phenotypes.","evidence":"GSK3β/proteasome inhibitor immunoblotting in myeloma; Co-IP of MAFB-ETS2 and MAFB-PCAF/P300 with knockdown in T-ALL; conditional alpha-cell KO defining glucagon/Arx control; Sox10 regulation in cardiac neural crest","pmids":["29980194","29138297","29378833","30236445"],"confidence":"High","gaps":["E3 ligase mediating MAFB ubiquitination unidentified","Several arms single-lab (Medium)"]},{"year":2021,"claim":"Integrated MAFB into prostaglandin and tolerogenic signaling axes, showing PGE2/EP4 induces it for macrophage anti-inflammatory repair and GR/TET2 partnering drives tolDC DNA-demethylation programs.","evidence":"Parallel myeloid COX-2/EP4/MafB KO mice in acute kidney injury; Co-IP of GR-MAFB-TET2 with bisulfite sequencing and ChIP in human DCs","pmids":["34774558","34893889"],"confidence":"High","gaps":["How MAFB-TET2 selects loci for demethylation not fully defined","Direct vs indirect anti-/pro-inflammatory targets downstream of EP4 not enumerated"]},{"year":2023,"claim":"Established MAFB's role in tissue-resident macrophage specification and innate-immune restraint, showing it controls monocyte-to-interstitial-macrophage transition and sustains p62/mitophagy to suppress the NLRP3 inflammasome.","evidence":"Lung IM niche depletion model with scRNA-seq and chimeras; MafB KO/knockdown macrophages with NLRP3 assays, mitochondrial ROS, and myeloid KO mice challenged with LPS/P. aeruginosa","pmids":["36928411","37845329"],"confidence":"High","gaps":["Transcriptional target driving p62 expression not directly mapped","Selectivity for NLRP3 over other inflammasomes mechanistically incomplete"]},{"year":null,"claim":"How MAFB's partner selection, SUMO state, and proteasomal turnover are coordinately set to specify which tissue-specific gene program it executes remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No identified E3 ligase or SUMO ligase/protease that controls MAFB in vivo","No structural model of MAFB heterodimer or cofactor (MLL3/4, TET2, ETS2) complexes","Logic determining activator vs repressor (DNA-binding interference) mode across tissues undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,2,3,12,22,23,27,33]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,3,22,27,31]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,4,8]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,3,29]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,3,12,23,27]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2,7,14,28,36,38]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[10,11,19,21,34,35,41]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[15,29]}],"complexes":["MLL3/MLL4 H3K4 methyltransferase complex","MAFB-GR-TET2 complex"],"partners":["ETS1","FOS","PU.1","GCM2","ETS2","TET2","NCOA6","EP300"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y5Q3","full_name":"Transcription factor MafB","aliases":["V-maf musculoaponeurotic fibrosarcoma oncogene homolog B"],"length_aa":323,"mass_kda":35.8,"function":"Acts as a transcriptional activator or repressor (PubMed:27181683). Plays a pivotal role in regulating lineage-specific hematopoiesis by repressing ETS1-mediated transcription of erythroid-specific genes in myeloid cells. Required for monocytic, macrophage, osteoclast, podocyte and islet beta cell differentiation. Involved in renal tubule survival and F4/80 maturation. Activates the insulin and glucagon promoters. Together with PAX6, transactivates weakly the glucagon gene promoter through the G1 element. SUMO modification controls its transcriptional activity and ability to specify macrophage fate. Binds element G1 on the glucagon promoter (By similarity). Involved either as an oncogene or as a tumor suppressor, depending on the cell context. Required for the transcriptional activation of HOXB3 in the rhombomere r5 in the hindbrain (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9Y5Q3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MAFB","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MAFB","total_profiled":1310},"omim":[{"mim_id":"619215","title":"OCULOMOTOR-ABDUCENS SYNKINESIS; OCABSN","url":"https://www.omim.org/entry/619215"},{"mim_id":"618889","title":"LIBERFARB SYNDROME; LIBF","url":"https://www.omim.org/entry/618889"},{"mim_id":"617041","title":"DUANE RETRACTION SYNDROME 3 WITH OR WITHOUT DEAFNESS; DURS3","url":"https://www.omim.org/entry/617041"},{"mim_id":"612974","title":"DEP DOMAIN-CONTAINING PROTEIN 6; DEPDC6","url":"https://www.omim.org/entry/612974"},{"mim_id":"612770","title":"PHOSPHATIDYLSERINE DECARBOXYLASE; PISD","url":"https://www.omim.org/entry/612770"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Nucleoli","reliability":"Additional"},{"location":"Golgi apparatus","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"parathyroid gland","ntpm":256.8}],"url":"https://www.proteinatlas.org/search/MAFB"},"hgnc":{"alias_symbol":[],"prev_symbol":["KRML"]},"alphafold":{"accession":"Q9Y5Q3","domains":[{"cath_id":"1.20.5.170","chopping":"208-279","consensus_level":"medium","plddt":96.9526,"start":208,"end":279}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y5Q3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y5Q3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y5Q3-F1-predicted_aligned_error_v6.png","plddt_mean":62.59},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MAFB","jax_strain_url":"https://www.jax.org/strain/search?query=MAFB"},"sequence":{"accession":"Q9Y5Q3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y5Q3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y5Q3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y5Q3"}},"corpus_meta":[{"pmid":"8620536","id":"PMC_8620536","title":"MafB is an interaction partner and 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inhibiting erythroid differentiation.\",\n      \"method\": \"Yeast one-hybrid screen, co-immunoprecipitation/pulldown, transient transfection reporter assays, overexpression in erythroblast cell line with transferrin receptor gene readout\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal interaction identified by yeast screen, mechanism confirmed by reporter assays and functional differentiation readout, multiple orthogonal methods in a highly cited single study\",\n      \"pmids\": [\"8620536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"MafB forms homodimers through its leucine zipper, binds Maf-recognition elements (MAREs), forms heterodimers with v-Maf and Fos but not Jun, and acts as a transcriptional activator of MARE-containing promoters; overexpression transforms chicken embryo fibroblasts.\",\n      \"method\": \"DNA-binding assays, dimerization assays, transient cotransfection reporter assays, focus formation/transformation assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal biochemical and functional assays in founding characterization paper, widely replicated\",\n      \"pmids\": [\"7935473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"MafB overexpression in transformed chicken hematopoietic myeloblasts drives rapid macrophage differentiation (morphology, surface markers, phagocytic activity, nitric oxide release), while a dominant-negative MafB allele inhibits myeloid colony formation and myeloblast-to-macrophage differentiation, establishing MafB as a specific and essential determinant of the monocytic program.\",\n      \"method\": \"Retroviral overexpression and dominant-negative allele in transformed chicken hematopoietic precursors, colony assays, morphology, surface marker expression, phagocytosis and NO-release functional assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain-of-function and loss-of-function with multiple orthogonal phenotypic readouts; replicated in multiple subsequent studies\",\n      \"pmids\": [\"10790365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"MafB directly regulates transcription of Pdx1, Nkx6.1, and GLUT2 in developing islet beta-cells, as demonstrated by ChIP showing MafB binding within endogenous control region sequences of these genes; MafB-null embryos have reduced insulin+ and glucagon+ cells with normal total endocrine cell numbers.\",\n      \"method\": \"MafB knockout mouse analysis, immunohistochemistry, ChIP on endogenous gene control regions\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout phenotype with direct ChIP evidence for target gene binding, multiple orthogonal methods\",\n      \"pmids\": [\"17360442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"MafB negatively regulates RANKL-induced osteoclast differentiation: MafB proteins physically interfere with the DNA-binding ability of c-Fos, Mitf, and NFATc1, inhibiting their transactivation of NFATc1 and OSCAR; overexpression blocks TRAP+ multinuclear osteoclast formation while retaining phagocytic activity; RNAi knockdown of MafB enhances osteoclastogenesis.\",\n      \"method\": \"Overexpression and RNAi in bone marrow-derived monocyte/macrophage cells, TRAP staining, reporter assays, DNA-binding interference assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain-of-function and loss-of-function, mechanistic DNA-binding interference demonstrated, multiple orthogonal methods\",\n      \"pmids\": [\"17158225\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"SUMO-1 modifies MafB in vitro and in vivo at lysines K32 and K297. SUMOylation reduces MafB-driven transactivation and macrophage differentiation potential; SUMOylation-deficient MafB (K32R K297R) resists v-Myb-mediated repression and can drive macrophage differentiation even in the presence of active Myb. Direct repression of MafB transactivation by v-Myb is strictly dependent on MafB SUMO modification.\",\n      \"method\": \"In vitro SUMOylation assay, site-directed mutagenesis (K32R K297R), inducible Myb alleles, macrophage differentiation assays, transactivation reporter assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro SUMOylation assay plus mutagenesis plus functional differentiation readout, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"17548468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Combined deficiency of MafB and c-Maf enables self-renewal of mature monocytes and macrophages without loss of differentiated phenotype; this continuous proliferation requires concomitant upregulation of pluripotent stem cell factors KLF4 and c-Myc, as shown by shRNA inactivation.\",\n      \"method\": \"MafB/c-Maf double-knockout, shRNA knockdown of KLF4 and c-Myc, in vitro expansion, transplantation assays\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic double-knockout combined with shRNA epistasis and in vivo transplantation, multiple orthogonal methods\",\n      \"pmids\": [\"19892988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MafB specifically restricts M-CSF-mediated myeloid commitment divisions in hematopoietic stem cells (HSCs); MafB deficiency enhances HSC sensitivity to M-CSF and activates PU.1 in HSCs in vivo; single-cell analysis shows reduced MafB enables M-CSF to instruct asymmetric divisions producing PU.1+ progeny; competitive repopulation advantage is PU.1 and M-CSF-receptor dependent.\",\n      \"method\": \"MafB-deficient mouse model, single-cell analysis, competitive repopulation assays, serial transplantation, in vivo M-CSF receptor signaling analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse with single-cell analysis, epistasis with PU.1 and M-CSFR, serial transplantation, multiple orthogonal methods\",\n      \"pmids\": [\"19632180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PU.1 directly binds MafB protein, inhibits its transcriptional activity in macrophages, and represses its ability to induce macrophage differentiation; high PU.1 activity favors DC fate by inhibiting both expression and activity of MafB, while constitutive MafB expression inhibits DC differentiation.\",\n      \"method\": \"Activated transcription factors in transformed myeloid progenitors, direct protein binding assay between PU.1 and MafB, reporter assays for transcriptional activity, DC/macrophage differentiation assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding demonstrated, gain-of-function experiments, multiple cell systems and readouts\",\n      \"pmids\": [\"15598817\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ERK signaling induces MafB/Kreisler expression during megakaryocyte differentiation; MafB synergizes with GATA and Ets factors to enhance transcription from the GPIIb (CD41) proximal promoter; dominant-negative or antisense suppression of MafB inhibits ERK-dependent GPIIb transactivation.\",\n      \"method\": \"ERK activation assays, dominant-negative and antisense MafB constructs, luciferase reporter assays with GPIIb promoter, cotransfection with GATA/Ets\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function and reporter assays, single lab, two orthogonal methods\",\n      \"pmids\": [\"15121870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"MafB is essential for podocyte differentiation and renal tubule survival; MafB-null mice show renal dysgenesis with abnormal podocyte differentiation, tubular apoptosis, and suppressed F4/80 expression in nonadherent macrophages; F4/80 expression is directly regulated by MafB in hematopoietic cells.\",\n      \"method\": \"mafB/GFP knock-in null mutant mouse, histology, immunofluorescence, primary culture of fetal liver hematopoietic cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse with direct GFP knock-in reporter, primary cell culture confirmation, multiple tissue phenotypes analyzed\",\n      \"pmids\": [\"16847325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"MafB/Kreisler is essential for cellular differentiation of glomerular visceral epithelial cells (podocytes); homozygous kr(enu) mice develop proteinuria, foot process fusion/effacement, and reduced Podocin and Nephrin levels; MafB acts downstream of Pod1 bHLH transcription factor during the capillary loop to mature stage transition.\",\n      \"method\": \"kr(enu) homozygous mouse model, histology, proteinuria measurement, electron microscopy of podocyte foot processes, gene expression analysis, epistasis with Pod1\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout phenotype with epistasis placement downstream of Pod1, multiple structural and molecular readouts\",\n      \"pmids\": [\"12217315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MafB interacts directly with Gcm2 to synergistically activate PTH gene expression; MafB is required for parathyroid separation from the thymus and migration toward the thyroid; MafB deficiency impairs PTH expression and secretion, reduces renal cyp27b1 expression, and reduces bone mineralization.\",\n      \"method\": \"MafB knockout mouse, co-immunoprecipitation of MafB and Gcm2, luciferase reporter assay for PTH promoter, histology, serum PTH/calcium measurements\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct protein-protein interaction by Co-IP, reporter assays, knockout phenotype with multiple functional readouts\",\n      \"pmids\": [\"21713993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MafB mediates oxidized LDL-activated LXR/RXR-induced expression of apoptosis inhibitor of macrophages (AIM) in foam cells; without MafB, activated LXR/RXR fails to induce AIM expression; Mafb-deficient macrophages are prone to apoptosis and haematopoietic reconstitution with Mafb-deficient cells reduces early atherogenic lesion.\",\n      \"method\": \"Mafb-deficient mouse, hematopoietic reconstitution in LDL receptor-deficient mice, foam cell apoptosis assays, LXR/RXR activation experiments, gene expression analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo haematopoietic reconstitution, mechanistic LXR/RXR→MafB→AIM pathway, multiple orthogonal methods\",\n      \"pmids\": [\"24445679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MafB is a critical transcriptional regulator of complement component C1q in macrophages; Mafb-deficient macrophages have reduced C1q expression and impaired efferocytosis; efferocytosis defect can be rescued by wild-type but not C1q-deficient mouse serum; MafB overexpression induces C1q-dependent gene expression; Mafb deficiency increases glomerular autoimmunity.\",\n      \"method\": \"Mafb-deficient mouse, hemolysis assay for classical complement pathway, efferocytosis rescue experiments with serum from WT vs C1q-deficient mice, MafB overexpression, immunohistochemistry\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including rescue experiment, functional complement assay, overexpression and knockout in same study\",\n      \"pmids\": [\"29167450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MLL3 and MLL4 histone H3K4 methyltransferase complexes physically bind MAFB (and closely related MAFA) in islet beta-cells; MAFB was found in ~1.5 MDa MLL3/MLL4 complexes by size fractionation; knockdown of NCOA6 (core MLL3/4 subunit) reduces expression of MAFA and MAFB target genes in mouse and human beta-cell lines.\",\n      \"method\": \"Unbiased in-cell biochemical pulldown plus mass spectrometry, size-fractionation of beta-cell extracts, NCOA6 knockdown in mouse and human beta-cell lines, gene expression analysis\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mass spectrometry-confirmed interaction, size-fractionation biochemistry, functional knockdown, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"26180087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TFE3 transcription factor directly transactivates the MAFB promoter through an E-box element conserved across mammalian species; EMSA identified the TFE3-binding site in the MAFB promoter; deletion or mutation of this E-box prevents TFE3-driven transactivation; TFE3 overexpression highly induces MAFB in human hematopoietic cells undergoing macrophage differentiation.\",\n      \"method\": \"EMSA with MAFB promoter E-box probe, luciferase reporter assay with E-box deletion/mutation constructs, TFE3 retroviral overexpression and siRNA knockdown in human hematopoietic cells\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA plus reporter assay plus functional overexpression, single lab, two orthogonal methods\",\n      \"pmids\": [\"19332055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Vitamin D3 induces monocyte differentiation via a sequential transactivation cascade: VDR → Hox-A10 → MafB; Hox-A10 directly binds to the MafB promoter (demonstrated by EMSA and luciferase assay) and upregulates MafB expression, which in turn drives monocyte differentiation of CD34+ hematopoietic progenitors.\",\n      \"method\": \"Retroviral Hox-A10 transduction of CD34+ progenitors, EMSA with MafB promoter probe, luciferase reporter assay, vitamin D3 stimulation with RT-PCR for Hox-A10 and MafB\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding by EMSA plus reporter assay, functional monocyte differentiation readout, single lab\",\n      \"pmids\": [\"18832725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The mouse mafB gene promoter contains Hox-A10-binding palindromic MARE/E-box elements and GC-boxes; the gene is positively auto-regulated by MafB itself (cotransfection assay); MyoD activates the mafB promoter; the gene lacks intron structure.\",\n      \"method\": \"Genomic cloning, RNase protection for transcription start site mapping, transient transfection luciferase reporter assays with 5'-flanking region deletions/mutations\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assays with promoter constructs and cotransfection, single lab, two orthogonal methods (functional and sequence analysis)\",\n      \"pmids\": [\"10721736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"In the developing chick hindbrain, MafB exhibits positive autoregulatory activity, represses Hoxb1 expression, and can synergize with or antagonize Krox20 activity in a spatially restricted manner; the kreisler mutation also causes ectopic MafB activation in rhombomere 3.\",\n      \"method\": \"Gain-of-function electroporation in chick embryo hindbrain, re-analysis of kreisler mutant mice, in situ hybridization\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function in vivo experiments with multiple gene expression readouts, single lab\",\n      \"pmids\": [\"12490204\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"FGF signaling regulates MafB/kr expression in the hindbrain; exogenous FGFs induce ectopic mafB/kr expression while an FGF signaling inhibitor specifically downregulates mafB/kr in the hindbrain neuroepithelium and neural crest.\",\n      \"method\": \"Exogenous FGF protein application to chick neural tube, FGF signaling inhibitor treatment, in situ hybridization for mafB/kr\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function and loss-of-function FGF manipulation with gene expression readout, single study\",\n      \"pmids\": [\"11044406\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"MafB/Kr expression in rhombomeres 5/6 is regulated by a posteriorizing signal present in posterior somites; retinoic acid mimics this effect, repressing MafB/Kr in r5/6 and inducing it more rostrally in a concentration-dependent manner, indicating that a threshold concentration of a posteriorizing morphogen (retinoic acid or related signal) defines the MafB/Kr expression domain.\",\n      \"method\": \"Quail/chick chimera grafting of rhombomeres and somites, retinoic acid bead implantation, in situ hybridization for MafB/Kr\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo grafting experiments with retinoic acid bead manipulation, multiple positional tests, single lab\",\n      \"pmids\": [\"9477316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In developing chick limb buds, MafB/cFos heterodimers repress apoptosis while MafB/cJun heterodimers promote apoptosis; MafB and cJun directly activate expression of p63 and p73 (cell cycle arrest components) as demonstrated by ChIP-seq in chick limb buds.\",\n      \"method\": \"ChIP-seq in chick limb buds, gain-of-function overexpression of MafB/cFos and MafB/cJun heterodimers, apoptosis quantification, functional promoter analysis of p63 and p73\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq for direct target binding plus functional heterodimer experiments, single lab\",\n      \"pmids\": [\"25005477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MAFB is necessary and sufficient for epidermal progenitor differentiation; MAF:MAFB regulates ~393 genes in epidermis; ANCR and TINCR lncRNAs act as upstream regulators of MAF:MAFB; ChIP-seq showed MAF:MAFB binding to epidermal differentiation TF genes (GRHL3, ZNF750, KLF4, PRDM1) whose expression they control; these downstream TFs rescue specific MAF:MAFB target gene subsets upon MAF:MAFB loss.\",\n      \"method\": \"Kinetic transcriptome analysis, ChIP-seq, lncRNA knockdown (ANCR, TINCR), TF rescue experiments, gain-of-function and loss-of-function of MAF/MAFB\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq for genome-wide binding, necessity/sufficiency experiments, epistasis established by rescue assays, multiple orthogonal methods\",\n      \"pmids\": [\"25805135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Androgen receptor (AR) signaling is required for Mafb expression in male genital tubercle mesenchyme; two functional androgen response elements (AREs) were identified in the Mafb 3'UTR and shown to bind AR; β-catenin also regulates Mafb expression during urethral masculinization; Mafb KO male mice exhibit defective embryonic urethral formation.\",\n      \"method\": \"Mafb KO mouse, AR KO mouse, exogenous androgen treatment, luciferase reporter assay with Mafb 3'UTR AREs, ChIP for AR binding at 3'UTR AREs, immunohistochemistry\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct AR binding to Mafb 3'UTR by ChIP plus reporter assay, KO phenotype, single lab\",\n      \"pmids\": [\"26636186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"C/EBPβ isoform ratio regulates osteoclastogenesis through MafB: the long transactivating LAP isoform promotes MafB promoter activity and MafB gene expression (attenuating osteoclastogenesis), while the short repressive LIP isoform reduces MafB; rapamycin (mTOR inhibitor) increases LAP/LIP ratio and inhibits osteoclastogenesis via MafB in a C/EBPβ-dependent manner.\",\n      \"method\": \"C/EBPβ null and LIP knock-in mouse osteoclast precursors, rapamycin treatment, MafB promoter reporter assays with LAP and LIP constructs, qRT-PCR for MafB expression\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple mouse genetic models, direct promoter reporter assays, functional osteoclastogenesis readout, single lab\",\n      \"pmids\": [\"19440205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MafB directly regulates Nephrin transcription in podocytes (shown by reporter assay); podocyte-specific MafB overexpression in diabetic mice ameliorates albuminuria and preserves Nephrin expression; Mafb overexpression also upregulates glutathione peroxidase and enhances Notch2 expression in podocytes.\",\n      \"method\": \"Podocyte-specific MafB transgenic mice with streptozotocin-induced diabetes, luciferase reporter assay for Nephrin promoter, histology, urine/serum biochemistry\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct reporter assay for Nephrin regulation, in vivo transgenic rescue, single lab\",\n      \"pmids\": [\"24722438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MafB is a downstream target of the IL-10/STAT3 signaling pathway in macrophages; IL-10-activated STAT3 induces MafB, which in turn directly activates MMP9 and IL-7R gene transcription through MARE elements in their promoters (demonstrated by EMSA and luciferase reporter assay).\",\n      \"method\": \"MafB inactivation and overexpression in human primary macrophages, EMSA with MMP9 and IL-7R promoter MARE probes, luciferase reporter assay, IL-10/STAT3 pathway inhibition\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct DNA binding by EMSA plus reporter assay plus gain/loss-of-function in primary cells, single lab\",\n      \"pmids\": [\"24472656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MAFB knockdown impairs acquisition of the anti-inflammatory profile of human M-CSF-driven macrophages and establishes the MAFB-dependent gene signature; macrophages from patients with multicentric carpotarsal osteolysis (caused by MAFB mutations) show skewed polarization, validating the MAFB anti-inflammatory role in human disease.\",\n      \"method\": \"MAFB siRNA knockdown in human monocyte-derived macrophages, gene expression profiling, functional polarization assays, analysis of patient macrophages with MAFB mutations\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function in primary human cells confirmed by human disease mutation, multiple readouts, single lab\",\n      \"pmids\": [\"28093525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MAFB acts in synergy with glucocorticoid receptor (GR) to drive tolerogenic DC differentiation; GR and MAFB both interact with methylcytosine dioxygenase TET2 and bind to genomic loci that undergo specific demethylation in tolDCs; MAFB knockdown erases tolerogenic properties of tolDCs, reverses specific DNA demethylation, and reverts MAFB-dependent gene upregulation.\",\n      \"method\": \"Transcriptomic and epigenomic analysis, MAFB knockdown in human DCs, Co-IP of GR, MAFB, and TET2, ChIP for genomic binding, bisulfite sequencing for DNA methylation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP demonstrating ternary complex with TET2, loss-of-function, epigenomic readout, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"34893889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MAFB enhances oncogenic Notch1 signaling in T-ALL by binding ETS2 and recruiting acetyltransferases PCAF and P300; MAFB and ETS2 synergistically enhance Notch1 signaling; MAFB knockdown reduces Notch1 target genes MYC and HES1 expression and impairs T-ALL growth.\",\n      \"method\": \"Gain-of-function screen in mouse T-ALL models, Co-IP for MAFB-ETS2 and MAFB-PCAF/P300 interactions, MAFB knockdown in mouse and human T-ALL cells, Notch target gene expression analysis\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct protein-protein interaction by Co-IP (MAFB-ETS2, MAFB-PCAF/P300), loss-of-function, in vivo mouse T-ALL model, multiple orthogonal methods\",\n      \"pmids\": [\"29138297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SUMOylation of MAFB at lysine 32 by SUMO1 is critical for cell cycle regulation in colorectal cancer cells; SUMOylated MAFB directly binds the CDK6 promoter to regulate CDK6 transcription; MAFB knockdown blocks CRC cell proliferation by G0/G1 arrest; K32-mutant MAFB (non-SUMOylatable) shows reduced tumorigenic capacity in xenografts.\",\n      \"method\": \"SUMO1 SUMOylation assay, ChIP for MAFB binding to CDK6 promoter, shRNA knockdown, cell cycle analysis, K32 mutation, xenograft mouse model\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct ChIP for CDK6 promoter binding, mutagenesis of SUMOylation site, in vivo xenograft, single lab\",\n      \"pmids\": [\"27829226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"GSK3β activity and proteasome activity regulate MAFb protein stability (not mRNA level); inhibition of GSK3β or treatment with proteasome inhibitors (bortezomib, carfilzomib) prevents MAFb protein degradation; MAFb is constitutively degraded by the ubiquitin/proteasome system, and high MAFb protein confers resistance to proteasome inhibitors in multiple myeloma cells.\",\n      \"method\": \"GSK3β inhibitor treatment, proteasome inhibitor treatment, immunoblotting for MAFb protein vs mRNA, MAFb silencing by lentiviral knockdown, apoptosis/caspase activation assays\",\n      \"journal\": \"BMC cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological dissection of GSK3 and proteasome roles in MAFb stability, knockdown with functional rescue, single lab\",\n      \"pmids\": [\"29980194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MafB is a critical transcriptional regulator of glucagon production and secretion in adult mouse alpha-cells; endocrine cell-specific and tamoxifen-inducible MafB knockout mice show decreased Arx+glucagon+ cells and glucagon content; MafB regulates Arx expression; MafB-null islets fail to respond to arginine due to impaired arginine transporter gene expression.\",\n      \"method\": \"Conditional and inducible MafB knockout mice, immunohistochemistry, gene expression analysis, glucagon secretion assays with arginine challenge\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple conditional KO models (cell-type specific and inducible), functional secretion assays, multiple gene expression readouts\",\n      \"pmids\": [\"29378833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MAFB is rapidly induced and activated by VEGF-C/VEGFR-3 signaling in lymphatic endothelial cells (LECs); MAFB induces PROX1 expression and other markers of differentiated LECs; Mafb-null embryos show impaired lymphatic patterning in the skin.\",\n      \"method\": \"CAGE RNA-seq for VEGF-C-induced transcriptional changes in LECs, Mafb global knockout mouse analysis of lymphatic patterning, MAFB knockdown in LECs\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CAGE-seq pathway activation combined with KO phenotype, single lab\",\n      \"pmids\": [\"26549461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Lymphatic endothelial cell (LEC)-intrinsic MAFB controls lymphatic vascular morphogenesis; conditional lymphatic-specific Mafb knockout produces embryonic lymphatic patterning defects and increased branching postnatally; loss of lymphatic MAFB enhances tumor-induced lymphangiogenesis.\",\n      \"method\": \"Conditional lymphatic-specific Mafb knockout (Cre-lox), histological analysis of lymphatic vessels, tumor lymphangiogenesis model\",\n      \"journal\": \"Angiogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific conditional KO establishing cell-intrinsic function, multiple developmental and pathological contexts, single lab\",\n      \"pmids\": [\"32307629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PGE2-mediated EP4 receptor activation induces MafB expression in kidney macrophages following acute injury; myeloid Mafb deletion recapitulates myeloid COX-2 or EP4 deletion, with delayed recovery, persistent pro-inflammatory macrophages, and increased kidney fibrosis; MafB upregulates anti-inflammatory genes and suppresses pro-inflammatory genes downstream of COX-2/PGE2/EP4.\",\n      \"method\": \"Myeloid-specific COX-2 KO, EP4 KO, and MafB KO mice, acute kidney injury model, macrophage phenotyping, gene expression analysis\",\n      \"journal\": \"Kidney international\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — three parallel myeloid-specific KO models with epistasis establishing COX-2→PGE2→EP4→MafB pathway, consistent phenotypes across models\",\n      \"pmids\": [\"34774558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MafB controls the transition from Ly6C+ monocyte local proliferation to interstitial macrophage (IM) subset specification in the lung; MafB-deficient monocytes fail to properly differentiate into IMs after niche engraftment; c-Maf specifically regulates CD206+ IM subset identity.\",\n      \"method\": \"Inducible lung IM niche depletion/refilling model, time-course single-cell RNA-seq, bone marrow chimeras, MafB conditional gene targeting\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO combined with scRNA-seq and bone marrow chimera system, multiple orthogonal methods from a rigorous study\",\n      \"pmids\": [\"36928411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MafB sustains p62 expression in macrophages to inhibit NLRP3 inflammasome activation; MafB knockdown/knockout markedly enhances NLRP3 (but not NLRP1, NLRC4, or AIM2) inflammasome activation; MafB inhibits mitochondrial damage and mitochondrial ROS production; LPS-induced MafB downregulation accelerates NLRP3 activation; myeloid MafB-deficient mice show increased systemic IL-1β.\",\n      \"method\": \"MafB KO and knockdown macrophages, NLRP3 inflammasome activation assays, p62 expression analysis, mitochondrial ROS measurement, myeloid-specific MafB KO mice with in vivo LPS/P. aeruginosa challenge\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanistic pathway (MafB→p62→mitophagy→NLRP3) established with KO, knockdown, pharmacological induction, in vitro and in vivo, multiple orthogonal methods\",\n      \"pmids\": [\"37845329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MafB acts as a transcriptional regulator of Sox10 expression specifically in the cardiac neural crest; loss of MafB function in chick cardiac neural crest reduces Sox10 expression without affecting other neural crest subpopulations.\",\n      \"method\": \"Transcriptome analysis of isolated cardiac neural crest, functional MafB knockdown in chick cardiac neural crest, in situ hybridization for Sox10\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional knockdown with specific gene expression readout in pure isolated cell population, single lab\",\n      \"pmids\": [\"30236445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PRLR signaling in maternal beta-cells during pregnancy is required for transient gestational MafB expression; conditional beta-cell-specific PRLR deletion abolishes gestational MafB induction; beta-cell-specific MafB deletion produces gestational diabetes mellitus with inadequate beta-cell expansion and failure to induce PRLR-dependent proliferation genes.\",\n      \"method\": \"Floxed Prlr conditional KO, MafB conditional beta-cell KO, pregnancy model, beta-cell mass quantification, gene expression analysis (Foxm1, cyclins, Tph1, serotonin)\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two conditional KO models establishing PRLR→MafB pathway in beta-cells, functional GDM phenotype, single lab\",\n      \"pmids\": [\"27217483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Maf and Mafb repress SST+ interneuron generation from MGE secondary progenitors; postnatal conditional deletion shows distinct roles of Mafb (morphological maturation) vs c-Maf in cortical interneuron development; Maf and Mafb positively regulate Mef2c and Snap25 to drive interneuron morphological maturation.\",\n      \"method\": \"Conditional MGE-specific single and double Mafb/c-Maf knockout mice, single-cell gene expression analysis, electrophysiology, morphological analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with epistasis to Mef2c/Snap25, multiple developmental phenotypes, single lab\",\n      \"pmids\": [\"30699346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MafB directly up-regulates key cellular mediators of cholesterol efflux from macrophage foam cells; MafB promotes macrophage M2 polarization; MafB expression is up-regulated by metabolic/immunological stimuli that promote M2 polarization or cholesterol efflux; MafB is downregulated by miR-155 and miR-33.\",\n      \"method\": \"MafB overexpression and knockdown in macrophages, cholesterol efflux assays, M2 marker expression, systems biology analysis of MafB target genes\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function and loss-of-function with functional cholesterol efflux readout, single lab\",\n      \"pmids\": [\"28790455\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MAFB is a bZIP transcription factor that homodimerizes via its leucine zipper to bind Maf-recognition elements (MAREs), heterodimerizes with Fos (but not Jun), physically interacts with transcription factors including Ets-1, Gcm2, PU.1, ETS2, and the MLL3/4 methyltransferase complexes, and is post-translationally regulated by SUMO modification (at K32/K297) and ubiquitin/proteasome-dependent degradation (stabilized by GSK3β inhibition); it acts as a master regulator of monocyte/macrophage differentiation and anti-inflammatory polarization, drives alpha-cell glucagon production, contributes to islet beta-cell maturation during development, controls podocyte differentiation and renal integrity, regulates parathyroid development and PTH expression in cooperation with Gcm2, shapes hindbrain segmentation via retinoic acid-dependent positional signals, governs lymphatic endothelial identity downstream of VEGF-C/VEGFR-3, and negatively regulates the NLRP3 inflammasome by sustaining p62/mitophagy in macrophages.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MAFB is a bZIP transcription factor that homodimerizes through its leucine zipper to bind Maf-recognition elements (MAREs) and heterodimerizes selectively with Fos but not Jun, acting as a context-dependent transcriptional activator on MARE-containing promoters [#1]. It functions as a master determinant of the monocyte/macrophage program: forced expression drives myeloblasts into mature macrophages while a dominant-negative allele blocks the monocytic fate [#2], and within hematopoietic stem cells MAFB restrains M-CSF-driven myeloid commitment by antagonizing PU.1, which itself directly binds MAFB to inhibit its activity [#7, #8]. MAFB output is tuned by a network of upstream inputs—TFE3, vitamin D3/Hox-A10, C/EBPβ isoform ratio, IL-10/STAT3, PGE2/EP4, and positive autoregulation—that converge on its promoter and protein level [#16, #17, #25, #27, #36, #18]. In differentiated macrophages MAFB enforces an anti-inflammatory, tissue-repair phenotype: it directly drives complement C1q to enable efferocytosis [#14], promotes M2 polarization and cholesterol-efflux machinery [#42], sustains p62 to suppress NLRP3 inflammasome activation through mitophagy [#38], and is required for monocyte-to-interstitial-macrophage specification [#37]. Beyond myeloid cells, MAFB is an essential developmental and homeostatic regulator: it controls podocyte differentiation and renal integrity by directly activating Nephrin and related genes [#10, #11, #26], cooperates with Gcm2 to drive PTH expression and parathyroid morphogenesis [#12], governs pancreatic alpha-cell glucagon production via Arx and islet beta-cell gene programs through ChIP-defined targets Pdx1, Nkx6.1 and GLUT2 [#33, #3], and establishes lymphatic endothelial identity downstream of VEGF-C/VEGFR-3 by inducing PROX1 [#34, #35]. MAFB activity is modulated post-translationally by SUMOylation at K32/K297, which dampens transactivation and gates v-Myb repression [#5], and by GSK3β- and proteasome-dependent turnover [#32]. MAFB also partners with chromatin and signaling factors—the MLL3/4 H3K4 methyltransferase complex in beta-cells [#15], TET2 with the glucocorticoid receptor in tolerogenic dendritic cells [#29], and ETS2 with PCAF/P300 to amplify oncogenic Notch1 signaling in T-ALL [#30]. Loss-of-function MAFB mutations cause multicentric carpotarsal osteolysis and skew human macrophage polarization [#28].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established the fundamental biochemistry of MAFB—how it recognizes DNA and chooses dimerization partners—defining it as a bZIP transcriptional activator with oncogenic potential.\",\n      \"evidence\": \"DNA-binding, dimerization, reporter, and transformation assays in fibroblasts\",\n      \"pmids\": [\"7935473\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish physiological target genes or in vivo function\", \"Partner selectivity (Fos vs Jun) consequences not yet linked to a cellular program\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Showed MAFB acts not only through MAREs but by direct protein interference with another transcription factor, repressing Ets-1 to block erythroid differentiation, revealing a dual transactivator/repressor mode.\",\n      \"evidence\": \"Yeast one-hybrid screen, co-IP, reporter assays, erythroblast differentiation readout\",\n      \"pmids\": [\"8620536\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of interaction domain not fully resolved\", \"Relevance to native erythropoiesis in vivo untested\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined MAFB as a specific and essential instructor of the macrophage fate, moving it from a biochemical entity to a lineage master regulator.\",\n      \"evidence\": \"Retroviral gain-of-function and dominant-negative in chicken myeloid precursors with morphology, marker, phagocytosis and NO readouts\",\n      \"pmids\": [\"10790365\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets driving the macrophage program not identified\", \"Did not address mammalian HSC-level regulation\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified PU.1 as a direct MAFB-binding antagonist and ERK as an inducer, placing MAFB within signaling-controlled fate-choice circuits in myeloid and megakaryocytic lineages.\",\n      \"evidence\": \"Direct binding assays, reporter assays, DC/macrophage and megakaryocyte differentiation systems\",\n      \"pmids\": [\"15598817\", \"15121870\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structural basis of PU.1-MAFB interaction unresolved\", \"ERK-to-MAFB induction mechanism indirect (Medium-confidence megakaryocyte arm)\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Extended the protein-interference mechanism to bone, showing MAFB blocks osteoclastogenesis by binding and disabling c-Fos, Mitf and NFATc1, while C/EBPβ isoform ratio and mTOR set MAFB levels upstream.\",\n      \"evidence\": \"Gain/loss-of-function in marrow macrophages, DNA-binding interference, reporter assays; C/EBPβ-null and LIP knock-in mice with rapamycin\",\n      \"pmids\": [\"17158225\", \"19440205\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether interference is competitive DNA occupancy or sequestration not fully dissected\", \"C/EBPβ regulation single-lab (Medium)\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrated MAFB is post-translationally gated by SUMOylation at K32/K297, which restrains transactivation and is the obligate substrate for v-Myb repression, adding a regulatory layer over its differentiation activity.\",\n      \"evidence\": \"In vitro SUMOylation, K32R/K297R mutagenesis, inducible Myb, differentiation and reporter assays\",\n      \"pmids\": [\"17548468\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"SUMO E3 ligase and deSUMOylating enzyme unidentified\", \"Physiological signals controlling MAFB SUMO state unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Provided direct ChIP evidence that MAFB binds endocrine pancreas genes (Pdx1, Nkx6.1, GLUT2), establishing it as a developmental regulator of islet beta-cell gene programs.\",\n      \"evidence\": \"MafB knockout mouse, immunohistochemistry, ChIP on endogenous control regions\",\n      \"pmids\": [\"17360442\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate developmental from adult beta-cell requirements\", \"Functional consequence on insulin secretion not fully resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Revealed that MAFB (with c-Maf) enforces terminal differentiation by suppressing self-renewal, and that it restrains HSC myeloid commitment via PU.1, linking lineage choice to proliferative arrest.\",\n      \"evidence\": \"MafB/c-Maf double-KO with KLF4/c-Myc shRNA epistasis; MafB-deficient single-cell HSC analysis, competitive repopulation and serial transplantation\",\n      \"pmids\": [\"19892988\", \"19632180\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MAFB transcriptionally represses KLF4/c-Myc not defined\", \"Direct vs indirect control of M-CSFR sensitivity unresolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified MAFB as essential for podocyte maturation downstream of Pod1, establishing a non-hematopoietic developmental role and a basis for glomerular disease.\",\n      \"evidence\": \"kr(enu) mouse, proteinuria, EM of foot processes, Podocin/Nephrin analysis, Pod1 epistasis; mafB/GFP knock-in null with renal and macrophage phenotypes\",\n      \"pmids\": [\"12217315\", \"16847325\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct podocyte target genes not yet defined at this stage\", \"Tubular apoptosis mechanism unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed MAFB cooperates physically with Gcm2 to drive PTH expression and is required for parathyroid morphogenesis, defining a tissue-specific transcriptional partnership.\",\n      \"evidence\": \"MafB KO mouse, Co-IP of MafB and Gcm2, PTH promoter reporter, serum PTH/calcium\",\n      \"pmids\": [\"21713993\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interaction interface and DNA co-occupancy not structurally defined\", \"Broader parathyroid target set unmapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined MAFB as the macrophage effector of multiple homeostatic and anti-atherogenic programs—LXR/RXR→AIM survival, podocyte Nephrin protection, and IL-10/STAT3→MMP9/IL-7R—showing direct MARE-mediated target activation in disease contexts.\",\n      \"evidence\": \"Mafb-deficient mice with hematopoietic reconstitution, foam-cell apoptosis assays, podocyte-specific transgenics in diabetes, EMSA/reporter on MMP9 and IL-7R promoters; limb-bud ChIP-seq for Fos/Jun heterodimer-dependent p63/p73\",\n      \"pmids\": [\"24445679\", \"24722438\", \"24472656\", \"25005477\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Several arms single-lab (Medium)\", \"How partner choice (Fos vs Jun) is set in vivo not resolved\", \"Direct vs indirect target distinctions vary by study\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Connected MAFB to chromatin-modifying machinery and a new lineage—showing it associates with MLL3/4 H3K4 methyltransferase complexes in beta-cells and is induced by VEGF-C to drive lymphatic PROX1 identity.\",\n      \"evidence\": \"Mass-spec pulldown and size fractionation of MLL3/4 complexes with NCOA6 knockdown; CAGE-seq of VEGF-C-induced LECs with Mafb-null lymphatic phenotype\",\n      \"pmids\": [\"26180087\", \"26549461\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MAFB recruits MLL3/4 to specific loci genome-wide not shown\", \"VEGF-C-to-MAFB induction mechanism (Medium) indirect\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated MAFB necessity/sufficiency for epidermal differentiation and direct hormonal/lncRNA control of its expression, broadening it to a general epithelial and developmental differentiation regulator.\",\n      \"evidence\": \"Epidermal ChIP-seq with ANCR/TINCR knockdown and TF rescue; AR ChIP on Mafb 3'UTR AREs with KO genital phenotype; PRLR-conditional KO linking gestational beta-cell MafB; SUMO-K32→CDK6 in colorectal cancer\",\n      \"pmids\": [\"25805135\", \"26636186\", \"27217483\", \"27829226\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific cofactor logic distinguishing epidermal vs other programs not unified\", \"SUMO/CDK6 and PRLR arms single-lab (Medium)\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified MAFB as a protein-stability-regulated oncogenic cofactor—stabilized by GSK3β inhibition/proteasome blockade and partnering with ETS2/PCAF/P300 to amplify Notch1 in T-ALL—linking its turnover to cancer phenotypes.\",\n      \"evidence\": \"GSK3β/proteasome inhibitor immunoblotting in myeloma; Co-IP of MAFB-ETS2 and MAFB-PCAF/P300 with knockdown in T-ALL; conditional alpha-cell KO defining glucagon/Arx control; Sox10 regulation in cardiac neural crest\",\n      \"pmids\": [\"29980194\", \"29138297\", \"29378833\", \"30236445\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase mediating MAFB ubiquitination unidentified\", \"Several arms single-lab (Medium)\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Integrated MAFB into prostaglandin and tolerogenic signaling axes, showing PGE2/EP4 induces it for macrophage anti-inflammatory repair and GR/TET2 partnering drives tolDC DNA-demethylation programs.\",\n      \"evidence\": \"Parallel myeloid COX-2/EP4/MafB KO mice in acute kidney injury; Co-IP of GR-MAFB-TET2 with bisulfite sequencing and ChIP in human DCs\",\n      \"pmids\": [\"34774558\", \"34893889\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MAFB-TET2 selects loci for demethylation not fully defined\", \"Direct vs indirect anti-/pro-inflammatory targets downstream of EP4 not enumerated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established MAFB's role in tissue-resident macrophage specification and innate-immune restraint, showing it controls monocyte-to-interstitial-macrophage transition and sustains p62/mitophagy to suppress the NLRP3 inflammasome.\",\n      \"evidence\": \"Lung IM niche depletion model with scRNA-seq and chimeras; MafB KO/knockdown macrophages with NLRP3 assays, mitochondrial ROS, and myeloid KO mice challenged with LPS/P. aeruginosa\",\n      \"pmids\": [\"36928411\", \"37845329\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcriptional target driving p62 expression not directly mapped\", \"Selectivity for NLRP3 over other inflammasomes mechanistically incomplete\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How MAFB's partner selection, SUMO state, and proteasomal turnover are coordinately set to specify which tissue-specific gene program it executes remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No identified E3 ligase or SUMO ligase/protease that controls MAFB in vivo\", \"No structural model of MAFB heterodimer or cofactor (MLL3/4, TET2, ETS2) complexes\", \"Logic determining activator vs repressor (DNA-binding interference) mode across tissues undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 2, 3, 12, 22, 23, 27, 33]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 3, 22, 27, 31]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 4, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 3, 29]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 3, 12, 23, 27]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2, 7, 14, 28, 36, 38]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [10, 11, 19, 21, 34, 35, 41]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [15, 29]}\n    ],\n    \"complexes\": [\n      \"MLL3/MLL4 H3K4 methyltransferase complex\",\n      \"MAFB-GR-TET2 complex\"\n    ],\n    \"partners\": [\n      \"ETS1\",\n      \"FOS\",\n      \"PU.1\",\n      \"GCM2\",\n      \"ETS2\",\n      \"TET2\",\n      \"NCOA6\",\n      \"EP300\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}