{"gene":"MAFB","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":1996,"finding":"MafB directly interacts with the DNA-binding domain of Ets-1 via its basic region/leucine-zipper domain, repressing Ets-1 transactivation of synthetic promoters containing Ets binding sites and inhibiting Ets-1-mediated transactivation of the transferrin receptor gene, thereby blocking erythroid differentiation.","method":"Yeast one-hybrid screen, co-immunoprecipitation/interaction assays, transactivation reporter assays, overexpression in erythroblast cell line","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1-2 — yeast interaction screen, direct binding mapped to domain, functional reporter assays, and in-cell differentiation phenotype; single foundational paper with multiple orthogonal methods","pmids":["8620536"],"is_preprint":false},{"year":1994,"finding":"MafB forms homodimers through its leucine zipper and binds Maf-recognition elements (MAREs); it forms heterodimers with v-Maf and Fos but not Jun; acts as a transcriptional activator at MARE-linked promoters and transforms chicken embryo fibroblasts.","method":"Dimerization assays, DNA-binding assays (EMSA), transient cotransfection reporter assays, transformation assay in chicken embryo fibroblasts","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 — multiple biochemical assays (dimerization, DNA binding, transcription) plus functional transformation assay; foundational characterization paper","pmids":["7935473"],"is_preprint":false},{"year":2007,"finding":"SUMO-1 modifies MafB in vitro and in vivo on lysines 32 and 297; SUMOylation reduces MafB transactivation capacity and macrophage differentiation potential, and is required for v-Myb-mediated repression of MafB, thereby controlling the balance between myeloid progenitor expansion and terminal macrophage differentiation.","method":"In vitro SUMOylation assay, in vivo SUMO modification confirmed by immunoprecipitation, site-directed mutagenesis (K32R K297R), functional differentiation assays, inducible Myb allele system","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 — reconstitution of SUMOylation in vitro and in vivo, mutagenesis of SUMO sites, multiple functional readouts; single paper with orthogonal methods","pmids":["17548468"],"is_preprint":false},{"year":2004,"finding":"ERK-induced MafB/Kreisler cooperates with GATA and Ets transcription factors to activate the megakaryocyte GPIIb/CD41 promoter; MafB is induced by ERK signaling during megakaryocyte differentiation and is required for GPIIb promoter transactivation within the proximal 114 bp.","method":"Promoter deletion/mutation reporter assays, dominant-negative and antisense suppression of MafB, ERK activation experiments, transactivation assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function (dominant-negative, antisense) with specific promoter readout, combined with gain-of-function; multiple approaches in one study","pmids":["15121870"],"is_preprint":false},{"year":2006,"finding":"MafB is required for podocyte (glomerular visceral epithelial cell) differentiation; MafB-null mice show proteinuria, foot process effacement, and reduced expression of Podocin and Nephrin, acting downstream of Pod1 transcription factor.","method":"Mafb/GFP knock-in null mutant mice, histology, immunofluorescence, gene expression analysis, genetic epistasis with Pod1","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — clean null mutant with specific cellular phenotype and pathway placement downstream of Pod1; replicated across multiple papers","pmids":["16847325"],"is_preprint":false},{"year":2006,"finding":"MafB activates glucagon gene transcription through a conserved control element between nucleotides -77 to -51 of the glucagon promoter in islet alpha-cells; MafB is also expressed in developing alpha- and beta-cells.","method":"Reporter assays with glucagon promoter deletion constructs, immunohistochemistry, transgenic mouse analysis (Pax4 and Pax6 knockouts)","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 1-2 — defined promoter element by deletion analysis, confirmed in multiple genetic backgrounds","pmids":["16443760"],"is_preprint":false},{"year":2007,"finding":"MafB is required for production of insulin+ and glucagon+ cells during pancreatic development and directly regulates transcription of Pdx1, Nkx6.1, and GLUT2 by binding within their endogenous control region sequences.","method":"MafB-null (kreisler) mouse analysis, chromatin immunoprecipitation (ChIP) at Pdx1, Nkx6.1, GLUT2 control regions, immunohistochemistry, in situ hybridization","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP demonstrating direct binding at endogenous loci plus null mutant phenotype; multiple target genes validated","pmids":["17360442"],"is_preprint":false},{"year":2008,"finding":"MafA and MafB regulate beta-cell-enriched Pdx1 expression exclusively through the Area II control region (-2153/-1923); MafA is bound to Area II in adult beta-cells by ChIP, and MafB binding was detected at Area II at embryonic day 18.5.","method":"Transient transfection reporter assays, quantitative ChIP, transgenic mouse analysis in MafB-/- background","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — direct binding shown by ChIP at specific regulatory element, functional reporter assays, and in vivo validation in knockout mice","pmids":["18522939"],"is_preprint":false},{"year":2010,"finding":"MafB acts as a transcriptional antagonist of antiviral type I interferon responses by blocking recruitment of coactivators to IRF3 at the IFNB1 promoter; MafB first acts as a weak positive basal regulator at AP-1-like sites, then upon interferon elicitor-induced IRF3 recruitment, MafB impairs IRF3-coactivator interactions.","method":"Reporter assays, promoter occupancy experiments, mathematical modeling, coactivator interaction assays","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 — direct mechanistic dissection of MafB-IRF3-coactivator interaction at specific promoter, supported by mathematical modeling","pmids":["20581830"],"is_preprint":false},{"year":2009,"finding":"C/EBPβ isoform ratio (LAP vs. LIP), controlled by mTOR-dependent alternative translation, regulates osteoclastogenesis by modulating MafB expression; the LAP isoform promotes MafB expression while LIP suppresses it, placing MafB downstream of the mTOR/C/EBPβ pathway as a negative regulator of osteoclastogenesis.","method":"C/EBPβ mutant mouse strains, LIP knock-in mice, rapamycin treatment, MafB promoter reporter assays, ectopic expression of LAP/LIP in monocytes","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — genetic models, pharmacological intervention, promoter activity assays; clear epistasis placing MafB downstream of mTOR/C/EBPβ","pmids":["19440205"],"is_preprint":false},{"year":2014,"finding":"MafB promotes foam-cell survival by mediating LXR/RXR-induced expression of the apoptosis inhibitor AIM; in the absence of MafB, activated LXR/RXR fails to induce AIM expression, rendering macrophages prone to apoptosis and attenuating early atherosclerotic lesion formation.","method":"Mafb-deficient fetal liver cell hematopoietic reconstitution in LDL receptor-deficient mice, gene expression analysis, loss-of-function in macrophages","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — in vivo hematopoietic reconstitution with defined phenotype, mechanistic link to LXR/AIM pathway identified","pmids":["24445679"],"is_preprint":false},{"year":2013,"finding":"Mafb drives postsynaptic density (PSD) formation in auditory ribbon synapses within spiral ganglion neurons (SGNs); Mafb acts downstream of the Gata3 transcriptional network, and restoration of Mafb rescues synapse defects in Gata3 mutants.","method":"Mafb mutant mouse analysis, synapse counting, electrophysiology (auditory brainstem responses), Gata3 mutant rescue by Mafb restoration, gain-of-function (increased Mafb accelerates synaptogenesis)","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — null mutant with specific cellular phenotype, epistasis rescue experiment (Mafb restores Gata3 mutant phenotype), gain-of-function confirmation","pmids":["24327562"],"is_preprint":false},{"year":2012,"finding":"MafB expression in hematopoietic stem/progenitor cells imposes an epigenetic (DNA methylation) program that is preserved in mature B cells, providing a novel mechanism for plasma cell neoplasia initiation.","method":"Transgenic mice expressing MafB in HS/PCs, genome-scale DNA methylation profiling, gene expression profiling, comparison to human multiple myeloma gene signatures","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 — transgenic mouse model with genome-scale epigenome profiling; single lab but multiple genomic methods","pmids":["22903061"],"is_preprint":false},{"year":2010,"finding":"Cdx1 directly represses early Mafb expression in the neural tube posterior to the r6/r7 boundary by binding to regulatory sequences within the Mafb locus, thereby defining the posterior Mafb expression boundary in hindbrain patterning.","method":"Chromatin immunoprecipitation (ChIP), in situ hybridization, immunofluorescence, regulatory sequence analysis, Cdx1 mutant mouse analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP demonstrating direct Cdx1 binding to Mafb regulatory sequences, combined with genetic null mutant and expression analysis","pmids":["21098558"],"is_preprint":false},{"year":2015,"finding":"MAFB is necessary and sufficient for epidermal progenitor differentiation; MAF:MAFB regulates 393 genes and binds (by ChIP-seq) to loci of downstream TFs including GRHL3, ZNF750, KLF4, and PRDM1; ANCR and TINCR lncRNAs act as upstream regulators of MAF:MAFB.","method":"Loss-of-function/gain-of-function in keratinocytes, kinetic transcriptome analysis, ChIP-seq for MAF:MAFB binding, epistasis with downstream TFs, lncRNA knockdown","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP-seq for genome-wide binding, sufficiency demonstrated, epistasis ordering within transcription factor network; multiple orthogonal methods","pmids":["25805135"],"is_preprint":false},{"year":2014,"finding":"MafB/cFos heterodimers repress apoptosis while MafB/cJun heterodimers promote apoptosis in developing chick limb buds; MafB/cJun directly activates p63 and p73 expression to arrest the cell cycle and drive apoptosis during limb morphogenesis.","method":"ChIP-seq in chick limb buds, functional overexpression/knockdown, reporter assays, immunostaining for apoptosis markers","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP-seq identifying direct targets, mechanistic dissection of heterodimer-specific activities, functional assays; multiple orthogonal methods","pmids":["25005477"],"is_preprint":false},{"year":2010,"finding":"HTLV-1 HBZ heterodimerizes with MafB via each bZIP domain, abrogates MafB DNA-binding activity at MARE elements, and reduces steady-state MafB protein levels via the proteasome pathway.","method":"Yeast two-hybrid screen, co-immunoprecipitation, luciferase reporter assays, proteasome inhibitor treatment, EMSA (MARE-bound MafB)","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal interaction assays, functional reporter, proteasome experiments; single lab but multiple methods","pmids":["20506502"],"is_preprint":false},{"year":2000,"finding":"The mouse mafB promoter contains TATA-like, CCAAT-box, GC-box elements, and palindromic MAREs/E-box sequences; MyoD activates the mafB promoter and MafB positively auto-regulates its own expression through these elements.","method":"Transient transfection reporter assays with 5'-flanking region deletions, cotransfection with MyoD, RNase protection for transcription start site","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 — promoter deletion analysis and cotransfection; single lab, mechanistic but limited to promoter context","pmids":["10721736"],"is_preprint":false},{"year":2008,"finding":"The vitamin D3 monocyte differentiation pathway operates through a transactivation cascade: vitamin D3 receptor → Hox-A10 → MafB; Hox-A10 directly binds to a conserved site in the MafB promoter to upregulate MafB expression during monocyte differentiation.","method":"EMSA identifying Hox-A10 binding site in MafB promoter, luciferase reporter assays with promoter deletion/mutation, retroviral Hox-A10 transduction in human CD34+ progenitors, qRT-PCR","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — direct binding to MafB promoter shown by EMSA, functional reporter with deletion confirmation; single lab","pmids":["18832725"],"is_preprint":false},{"year":2009,"finding":"TFE3 transcription factor directly activates MAFB expression by binding an EBox in the MAFB promoter; EBox deletion or mutation abolishes TFE3-mediated transactivation of the MAFB promoter.","method":"EMSA identifying TFE3-binding EBox in MAFB promoter, luciferase reporter assays, TFE3 ectopic expression and siRNA silencing in hematopoietic cells","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 — direct binding by EMSA, reporter assay with mutagenesis confirmation; single lab","pmids":["19332055"],"is_preprint":false},{"year":2014,"finding":"MafB promotes macrophage M2 polarization and cholesterol efflux from foam cells by directly upregulating key mediators of cholesterol efflux; MafB is itself regulated by metabolic/immunological stimuli including LXR-dependent and LXR-independent pathways, and is suppressed by miR-155 and miR-33.","method":"MafB overexpression/knockdown in macrophages, cholesterol efflux assays, gene expression analysis, miRNA regulation assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2-3 — functional assays with defined readouts (M2 markers, cholesterol efflux), single lab","pmids":["28790455"],"is_preprint":false},{"year":2016,"finding":"Prolactin receptor (PRLR) signaling in maternal beta-cells is required for transient gestational expression of MafB in a subset of beta-cells; MafB deletion in maternal beta-cells causes gestational diabetes with inadequate beta-cell expansion and failure to induce PRLR-dependent target genes.","method":"Conditional PRLR and MafB knockout mice (floxed alleles), beta-cell-specific Cre, glucose tolerance testing, BrdU proliferation assay, gene expression analysis","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 — conditional knockout mouse models with specific metabolic phenotype; epistasis placing MafB downstream of PRLR signaling","pmids":["27217483"],"is_preprint":false},{"year":2014,"finding":"MafB directly regulates Nephrin expression in podocytes (demonstrated by reporter assay); MafB overexpression in podocytes ameliorates diabetic nephropathy by maintaining Nephrin expression, upregulating glutathione peroxidase, and modulating Notch2 signaling.","method":"Nephrin promoter reporter assay, transgenic mice overexpressing Mafb in podocytes (nephrin promoter), streptozotocin-induced diabetes model, histology, biochemical assays","journal":"Journal of the American Society of Nephrology","confidence":"Medium","confidence_rationale":"Tier 2 — reporter assay for direct transcriptional regulation, in vivo transgenic model with functional readout; single lab","pmids":["24722438"],"is_preprint":false},{"year":2016,"finding":"MafB acts as a transcriptional regulator of epidermal keratinocyte differentiation; MafB-deficient mice show reduced expression of cornified envelope genes (filaggrin, repetin) and increased expression of lipid metabolism genes (Alox12e, Smpd3), with the upregulated genes enriched for targets of Gata3, Grhl3, and Klf4.","method":"MafB-knockout mouse analysis, transcriptional profiling, in vitro human keratinocyte differentiation, immunohistochemistry","journal":"The Journal of investigative dermatology","confidence":"Medium","confidence_rationale":"Tier 2 — null mutant with transcriptome profiling identifying specific gene targets; single lab","pmids":["27208706"],"is_preprint":false},{"year":2018,"finding":"MafB is a critical regulator of glucagon expression and alpha-cell function in adult mice; MafB directly regulates glucagon gene expression, arginine transporter gene expression (affecting arginine-stimulated glucagon secretion), and alpha-cell identity maintenance.","method":"Endocrine cell-specific and tamoxifen-inducible Mafb knockout mice, gene expression analysis, hormone measurement, arginine stimulation tests","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple conditional knockout strategies with specific functional phenotypes; single lab but multiple genetic models","pmids":["29378833"],"is_preprint":false},{"year":2015,"finding":"MAFB is rapidly induced by VEGF-C/VEGFR-3 signaling in lymphatic endothelial cells (LECs) and induces expression of PROX1 and other lymphatic differentiation markers; global Mafb-/- embryos show impaired lymphatic patterning in the skin.","method":"CAGE RNA-seq in LECs stimulated with VEGF-C, Mafb-null mouse analysis (E14.5 embryos), gene expression analysis","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 — transcriptomic approach with defined pathway (VEGF-C→MAFB→PROX1) and null mutant confirmation; single lab","pmids":["26549461"],"is_preprint":false},{"year":2020,"finding":"LEC-intrinsic MAFB controls lymphatic vascular morphogenesis during embryogenesis and tumor-induced lymphangiogenesis; conditional lymphatic-specific Mafb knockout shows increased lymphatic branching and enhanced tumor lymphangiogenesis.","method":"Conditional lymphatic-specific Mafb knockout mice (Prox1-Cre), embryonic lymphatic analysis, tumor implantation model, histology","journal":"Angiogenesis","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific conditional knockout with defined anatomical and functional phenotypes; confirms LECs as intrinsic site of action","pmids":["32307629"],"is_preprint":false},{"year":2018,"finding":"MafB drives cardiac neural crest transcription factor Sox10 expression; in MafB morphant chick embryos, Sox10 expression is specifically reduced in the cardiac neural crest.","method":"Transcriptome analysis of isolated cardiac neural crest (FoxD3-enhancer driven), MafB loss-of-function (morpholino), in situ hybridization for Sox10","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — transcriptome-guided functional test with specific molecular target; single lab, morpholino approach","pmids":["30236445"],"is_preprint":false},{"year":2017,"finding":"MAFB enhances oncogenic Notch1 signaling in T-ALL by binding ETS2 and interacting with acetyltransferases PCAF and P300, thereby recruiting coactivators to the Notch transcriptional complex; MAFB knockdown reduces expression of Notch1 targets MYC and HES1.","method":"Gain-of-function screen, co-immunoprecipitation of MAFB with ETS2 and PCAF/P300, luciferase reporter assays, mouse T-ALL models, shRNA knockdown in human T-ALL cells","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 — co-IP demonstrating protein-protein interactions, functional loss-of-function with specific target gene readout, multiple cell and mouse models","pmids":["29138297"],"is_preprint":false},{"year":2016,"finding":"MAFB can be SUMOylated by SUMO1 at lysine 32, and this modification is critical for cell cycle regulation by MAFB in colorectal cancer cells; SUMOylated MAFB directly regulates CDK6 transcription by binding its promoter.","method":"SUMO modification assays, K32 mutagenesis, ChIP for MAFB binding to CDK6 promoter, shRNA knockdown, xenograft in vivo tumor growth assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 — site-specific SUMOylation mapped by mutagenesis, ChIP at endogenous target, in vivo xenograft validation; single lab","pmids":["27829226"],"is_preprint":false},{"year":2014,"finding":"MafB is a direct transcriptional activator of MMP9 and IL-7R genes in human macrophages through MARE elements in their promoters; MafB is a downstream target of the IL-10/STAT3 signaling pathway that controls macrophage de-activation.","method":"EMSA and luciferase reporter assays for direct MARE-mediated activation, MafB inactivation/overexpression, IL-10/STAT3 pathway analysis in primary human macrophages","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 — direct binding by EMSA with functional reporter confirmation, pathway epistasis; single lab with human primary cells","pmids":["24472656"],"is_preprint":false},{"year":2021,"finding":"COX-2/PGE2/EP4 signaling in kidney macrophages induces MafB expression following acute kidney injury; myeloid MafB deletion recapitulates myeloid COX-2 or EP4 deletion phenotypes (delayed recovery, persistent inflammation, increased fibrosis), placing MafB downstream of PGE2/EP4 as an anti-inflammatory mediator.","method":"Myeloid-specific COX-2, EP4, and Mafb conditional knockout mice, acute kidney injury model, gene expression analysis, histology","journal":"Kidney international","confidence":"High","confidence_rationale":"Tier 2 — three parallel conditional knockout models with matching phenotypes establish epistasis; MafB placed downstream of COX-2/PGE2/EP4 axis","pmids":["34774558"],"is_preprint":false},{"year":2022,"finding":"MAFB acts in synergy with the glucocorticoid receptor (GR) to drive tolerogenic dendritic cell differentiation; GR and MAFB both interact with methylcytosine dioxygenase TET2 and co-bind genomic loci undergoing specific demethylation; MAFB knockdown erases the tolerogenic phenotype and reverts specific DNA demethylation.","method":"Co-immunoprecipitation of GR and MAFB with TET2, ChIP-seq, ATAC-seq, RRBS methylation profiling, MAFB knockdown in tolDCs, transcriptome analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1-2 — protein-protein interactions (GR-MAFB-TET2), genome-wide binding and methylation profiling, functional knockdown; multiple orthogonal methods","pmids":["34893889"],"is_preprint":false},{"year":2023,"finding":"MafB controls the transition from monocyte proliferation to lung interstitial macrophage (IM) subset specification during IM niche refilling; c-Maf specifically regulates the identity of the CD206+ IM subset downstream or in parallel to MafB.","method":"Inducible lung IM niche depletion/refilling model, time-course scRNA-seq, bone marrow chimeras, gene targeting (Mafb conditional KO), Csf1r inhibition","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 — in vivo conditional KO combined with single-cell transcriptomics and bone marrow chimeras; replicated across multiple experimental approaches","pmids":["36928411"],"is_preprint":false},{"year":2023,"finding":"MafB sustains p62 expression in macrophages, thereby maintaining autophagy/mitophagy, inhibiting mitochondrial damage and ROS production, and negatively regulating NLRP3 inflammasome activation; MafB protein is rapidly degraded by the ubiquitin/proteasome system.","method":"MafB knockdown and conditional KO macrophages, NLRP3 inflammasome activation assays, mitochondrial ROS and DNA assays, p62 expression analysis, in vivo LPS/infection models","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with specific mechanism (p62/autophagy axis), in vitro and in vivo phenotypes; multiple mechanistic layers tested","pmids":["37845329"],"is_preprint":false},{"year":2019,"finding":"miR-320a directly targets MafB mRNA (validated by AGO2 co-immunoprecipitation, luciferase reporter assay, and Western blotting); miR-320a-induced downregulation of MafB causes podocyte loss and dysfunction by reducing Nephrin and Gpx3 expression.","method":"AGO2 co-immunoprecipitation, luciferase 3'UTR reporter assay, Western blotting, adeno-associated viral delivery in db/db mice, MafB re-expression rescue","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2 — direct miRNA-target interaction validated by multiple methods (AGO2 RIP, luciferase, rescue); single lab","pmids":["31102503"],"is_preprint":false},{"year":2017,"finding":"MafB directly regulates parathyroid hormone (PTH) and cyclin D2 expression in parathyroid glands, as shown by reporter assay; MafB heterozygosity suppresses secondary hyperparathyroidism in a CKD mouse model.","method":"MafB heterozygous and tamoxifen-inducible KO mice, adenine-CKD model, promoter reporter assays for PTH and cyclin D2, RNA-seq of parathyroid glands","journal":"Kidney international","confidence":"Medium","confidence_rationale":"Tier 2 — reporter assay for direct transcriptional control, genetic models with specific endocrine phenotype; single lab","pmids":["28964572"],"is_preprint":false},{"year":2020,"finding":"MAFB knockout in human pluripotent stem cells (via CRISPR/Cas9) does not affect pancreatic progenitor specification but specifically impairs insulin- and glucagon-producing cell formation at the endocrine differentiation stage, favoring somatostatin- and pancreatic polypeptide-positive cells instead.","method":"CRISPR/Cas9 gene editing of hPSCs, endocrine differentiation protocol, immunostaining and flow cytometry for hormone-positive cell types","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — clean CRISPR KO in human system with specific stage-dependent phenotype; demonstrates species-specific role of MAFB in human beta-cell specification","pmids":["32488111"],"is_preprint":false},{"year":2019,"finding":"MafB contributes to spinal microglial activation underlying neuropathic pain development; peripheral nerve injury increases MafB expression in spinal microglia (mediated partly by decreased miR-152), and MafB deficiency (heterozygous mice, siRNA, or conditional KO) alleviates mechanical hypersensitivity.","method":"Heterozygous Mafb-deficient mice, siRNA intrathecal delivery, conditional Mafb KO mice, intrathecal transfer of Mafb-deficient microglia, peripheral nerve injury model","journal":"Glia","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic and pharmacological loss-of-function approaches with consistent phenotype; cell-transfer experiment confirms microglial-intrinsic role","pmids":["30485546"],"is_preprint":false},{"year":2019,"finding":"Mafb and c-Maf have compensatory prenatal roles in repressing SST+ cortical interneuron generation from MGE secondary progenitors, and distinct postnatal roles in interneuron morphological maturation and synaptogenesis.","method":"Conditional single and double Mafb/c-Maf KO mice (MGE-specific Cre), interneuron counting, morphological analysis, electrophysiology","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — single and double conditional KO with stage-specific phenotypic dissection; clean genetic epistasis","pmids":["30699346"],"is_preprint":false},{"year":2016,"finding":"MAFB mutations in the transactivation domain (amino acids 59-71) cause Multicentric Carpotarsal Osteolysis by reducing MAFB's ability to negatively regulate RANKL-mediated osteoclastogenesis; all pathogenic MAFB mutations cluster in this 13 amino acid stretch.","method":"Sequencing of MCTO patients, identification of domain-specific mutations, functional context from prior work on MAFB as negative regulator of RANKL-induced osteoclastogenesis","journal":"American journal of medical genetics. Part A","confidence":"Medium","confidence_rationale":"Tier 3 — genetic mapping of disease mutations to functional domain; mechanistic inference from domain location, no direct functional assay in this paper","pmids":["24989131"],"is_preprint":false},{"year":2018,"finding":"A MAFB p.Leu239Pro substitution in the DNA-binding domain significantly reduces transactivation of the F4/80 promoter (a known MAFB recognition element) in cultured monocytes and impairs podocyte differentiation in neonatal mice.","method":"Luciferase transactivation assay in monocytes, immunohistochemistry of patient podocytes, podocyte differentiation assay in neonatal mice, structural modeling","journal":"Kidney international","confidence":"Medium","confidence_rationale":"Tier 2 — direct functional assay on mutant protein, in vivo validation in mice; single lab","pmids":["29779709"],"is_preprint":false},{"year":2014,"finding":"Androgen receptor (AR) signaling is necessary for Mafb expression in male genital tubercle mesenchyme; Mafb is required for embryonic urethral masculinization, and androgen treatment fails to induce urethral masculinization in Mafb-null male mice.","method":"Mafb KO mice, AR KO mice, exogenous androgen treatment, morphological and gene expression analysis of genital tubercles","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — dual genetic models (Mafb KO, AR KO) with epistasis; androgen rescue experiment confirms pathway ordering","pmids":["25362053"],"is_preprint":false},{"year":2015,"finding":"Androgen regulates Mafb expression through two functional androgen response elements (AREs) in the Mafb 3'UTR; androgen receptor binds these AREs in vivo during urethral masculinization; β-catenin is an additional regulator of Mafb expression.","method":"Luciferase reporter assays with Mafb 3'UTR, chromatin immunoprecipitation of AR at Mafb 3'UTR AREs in vivo, β-catenin cotransfection assays","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP demonstrating AR binding to Mafb 3'UTR in vivo, reporter assay functional validation; single lab","pmids":["26636186"],"is_preprint":false},{"year":2008,"finding":"MAFB ectopic expression in multiple myeloma cell lines (inducible system) upregulates 284 transcripts including 14 genes also activated by C-MAF; functional promoter assays confirm MAFB directly drives these target gene promoters; MAFB expression confers antiapoptotic effects.","method":"Inducible MAFB expression system, microarray profiling, promoter reporter assays, comparison with ex vivo MM gene expression data","journal":"Experimental hematology","confidence":"Medium","confidence_rationale":"Tier 2 — inducible system with transcriptome readout and reporter validation; single lab but includes ex vivo confirmation","pmids":["19013005"],"is_preprint":false},{"year":2020,"finding":"Maf and Mafb positively regulate Mef2c and Snap25 to drive cortical interneuron morphological maturation; Maf and Mafb promote Mef2c expression to specify parvalbumin+ interneurons; conditional double KO decreases cortical interneuron survival and alters physiological properties.","method":"Conditional double KO (Maf and Mafb) with MGE-specific Cre, scRNA-seq, gene expression validation, electrophysiology","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — conditional double KO with scRNA-seq identifying specific gene targets and electrophysiological phenotype; multiple orthogonal approaches","pmids":["32452758"],"is_preprint":false}],"current_model":"MAFB is a bZIP transcription factor that binds Maf-recognition elements (MAREs) as homodimers or heterodimers with Fos (but not Jun), acts as a context-dependent transcriptional activator or repressor, is SUMOylated on K32/K297 (which modulates its transactivation capacity and susceptibility to repression by Myb), regulates macrophage differentiation, alpha-cell glucagon production, podocyte differentiation, epidermal keratinocyte differentiation, and lymphatic vessel patterning, and mechanistically antagonizes IRF3-coactivator interactions to dampen antiviral interferon responses, directly activates target gene promoters (including glucagon, Nephrin, PDX1, GPIIb/CD41, PTH, cyclin D2, MMP9, IL-7R, Sox10, p63, p73), and controls NLRP3 inflammasome activation through p62-dependent autophagy/mitophagy in macrophages."},"narrative":{"teleology":[{"year":1994,"claim":"Establishing that MAFB functions as a bZIP transcription factor that homodimerizes and selectively heterodimerizes with Fos (not Jun) to bind MAREs and activate transcription answered the fundamental question of how this protein recognizes DNA and with which partners.","evidence":"Dimerization assays, EMSA, reporter assays, and transformation assay in chicken embryo fibroblasts","pmids":["7935473"],"confidence":"High","gaps":["No crystal structure of MAFB homodimer or heterodimer on DNA","Endogenous target genes not yet identified"]},{"year":1996,"claim":"The discovery that MAFB physically interacts with Ets-1 via its bZIP domain and represses Ets-1 transactivation revealed that MAFB can function as a transcriptional repressor through protein-protein interactions independent of MARE binding, blocking erythroid differentiation.","evidence":"Yeast one-hybrid, co-IP, reporter assays, and erythroblast differentiation in cell line","pmids":["8620536"],"confidence":"High","gaps":["Physiological relevance in primary erythroid cells not tested","Whether MAFB-Ets-1 interaction occurs genome-wide or at select loci unknown"]},{"year":2006,"claim":"Parallel studies established MAFB as a direct activator of glucagon gene transcription through a conserved promoter element and as essential for podocyte differentiation (with null mice showing proteinuria and reduced Nephrin/Podocin), answering what endogenous tissues and target genes require MAFB.","evidence":"Glucagon promoter deletion/reporter assays; Mafb-null mice with kidney histology and gene expression analysis","pmids":["16443760","16847325"],"confidence":"High","gaps":["Direct ChIP at glucagon promoter not yet performed in this study","Mechanism of Nephrin/Podocin regulation not fully dissected"]},{"year":2007,"claim":"ChIP at endogenous Pdx1, Nkx6.1, and GLUT2 loci in the developing pancreas, combined with the null mutant phenotype, demonstrated that MAFB is a direct transcriptional regulator required for both insulin+ and glucagon+ cell production, extending its role beyond alpha-cells; simultaneously, SUMOylation at K32/K297 was shown to attenuate MAFB transactivation and mediate v-Myb repression, establishing a key post-translational regulatory mechanism.","evidence":"ChIP at endogenous loci in MafB-null pancreas; in vitro/in vivo SUMOylation assays with site-directed mutagenesis and differentiation readouts","pmids":["17360442","17548468"],"confidence":"High","gaps":["Whether SUMOylation affects MAFB DNA-binding genome-wide unknown","SUMO E3 ligase specificity for MAFB not identified"]},{"year":2009,"claim":"Placing MAFB downstream of mTOR/C/EBPβ signaling as a negative regulator of osteoclastogenesis and downstream of TFE3 in hematopoietic cells defined the signaling inputs controlling MAFB expression in myeloid lineage decisions.","evidence":"C/EBPβ mutant and LIP knock-in mice with rapamycin; TFE3 EMSA/reporter assay with mutagenesis in hematopoietic cells","pmids":["19440205","19332055"],"confidence":"High","gaps":["Direct C/EBPβ binding to MAFB promoter not shown by ChIP","How mTOR/C/EBPβ and TFE3 inputs are integrated at the MAFB locus unclear"]},{"year":2010,"claim":"The demonstration that MAFB antagonizes IRF3-coactivator interactions at the IFNB1 promoter revealed a dual-mode mechanism: MAFB first provides basal positive regulation via AP-1-like sites, then actively dampens virus-induced interferon responses by blocking coactivator recruitment, answering how MAFB modulates innate immunity.","evidence":"Reporter assays, promoter occupancy studies, coactivator interaction assays, mathematical modeling","pmids":["20581830"],"confidence":"High","gaps":["Which specific coactivators are blocked not fully enumerated","In vivo antiviral phenotype of Mafb-deficient macrophages not shown in this study"]},{"year":2014,"claim":"Multiple concurrent discoveries broadened MAFB's functional scope: MafB/cJun heterodimers directly activate p63/p73 to drive apoptosis in limb morphogenesis, MAFB mediates LXR-dependent AIM expression for foam-cell survival in atherosclerosis, and MAFB directly activates MMP9 and IL-7R in macrophages through MARE elements, revealing heterodimer-specific transcriptional outputs and macrophage-specific target genes.","evidence":"ChIP-seq in chick limb buds; fetal liver reconstitution in LDLr-KO mice; EMSA/reporter in human macrophages","pmids":["25005477","24445679","24472656"],"confidence":"High","gaps":["How heterodimer partner choice (Fos vs Jun) is regulated in vivo remains unclear","Whether AIM is a direct MAFB target or indirect via LXR not resolved"]},{"year":2015,"claim":"ChIP-seq in keratinocytes showed that MAF/MAFB directly binds loci of downstream transcription factors (GRHL3, ZNF750, KLF4, PRDM1) to drive epidermal differentiation, and VEGF-C/VEGFR-3 signaling was shown to rapidly induce MAFB in lymphatic endothelial cells where it activates PROX1, establishing MAFB as a master regulator in two new tissue contexts.","evidence":"ChIP-seq, loss/gain-of-function in keratinocytes, CAGE RNA-seq in LECs, Mafb-null embryo lymphatic analysis","pmids":["25805135","26549461"],"confidence":"High","gaps":["Direct MAFB binding at PROX1 locus not confirmed by ChIP","Genome-wide MAFB binding in LECs not performed"]},{"year":2016,"claim":"Identification of MAFB transactivation domain mutations (aa 59-71) as causative for Multicentric Carpotarsal Osteolysis linked MAFB loss-of-function to a Mendelian skeletal disorder, while conditional PRLR-knockout studies placed MAFB downstream of prolactin signaling for gestational beta-cell expansion.","evidence":"Patient sequencing with domain mapping; conditional PRLR and MafB KO mice with glucose tolerance testing","pmids":["24989131","27217483"],"confidence":"Medium","gaps":["No direct functional assay of MCTO mutations on osteoclastogenesis in this study","MAFB transcriptional targets mediating beta-cell proliferation not identified"]},{"year":2018,"claim":"MAFB was shown to enhance Notch1 signaling in T-ALL by recruiting coactivators PCAF/P300 through ETS2 interaction, and conditional adult alpha-cell knockout confirmed MAFB is continuously required for glucagon expression and alpha-cell identity, not just during development.","evidence":"Co-IP of MAFB-ETS2-PCAF/P300, reporter assays, shRNA in T-ALL cells; tamoxifen-inducible Mafb KO with arginine stimulation tests","pmids":["29138297","29378833"],"confidence":"High","gaps":["Whether MAFB-PCAF/P300 interaction is direct or bridged entirely by ETS2 not resolved","Genome-wide MAFB targets in adult alpha-cells not mapped"]},{"year":2019,"claim":"MAFB was established as a regulator of cortical interneuron specification (compensatory with c-Maf in repressing SST+ interneuron generation, with distinct postnatal roles in maturation) and of spinal microglial activation in neuropathic pain, expanding its neural functions.","evidence":"Conditional single/double KO mice with MGE-specific Cre, electrophysiology; heterozygous/conditional Mafb KO with nerve injury model and intrathecal microglia transfer","pmids":["30699346","30485546"],"confidence":"High","gaps":["Direct transcriptional targets of MAFB in microglia driving pain sensitization not identified","Mechanism by which MAFB and c-Maf achieve compensatory vs distinct functions unclear"]},{"year":2020,"claim":"Lymphatic-specific conditional knockout confirmed MAFB controls lymphatic vascular morphogenesis cell-autonomously, and human PSC knockout demonstrated a species-specific requirement for MAFB in human insulin+ and glucagon+ cell differentiation, while Maf/Mafb double-KO revealed Mef2c and Snap25 as key targets for interneuron maturation.","evidence":"Prox1-Cre conditional KO with tumor lymphangiogenesis model; CRISPR KO in hPSCs with endocrine differentiation; conditional double KO with scRNA-seq","pmids":["32307629","32488111","32452758"],"confidence":"High","gaps":["MAFB binding sites at Mef2c and Snap25 loci not confirmed by ChIP","Human-specific MAFB targets in beta-cell specification not mapped"]},{"year":2022,"claim":"The finding that MAFB interacts with TET2 and the glucocorticoid receptor to drive site-specific DNA demethylation during tolerogenic dendritic cell differentiation revealed a novel epigenetic mechanism through which MAFB shapes immune cell identity.","evidence":"Co-IP of GR-MAFB-TET2, ChIP-seq, ATAC-seq, RRBS methylation profiling, MAFB knockdown in tolDCs","pmids":["34893889"],"confidence":"High","gaps":["Whether MAFB-TET2 interaction is direct or mediated by GR not resolved","Catalytic dependence of TET2 on MAFB binding not tested"]},{"year":2023,"claim":"Two studies established that MAFB controls the monocyte-to-interstitial macrophage transition during lung niche refilling and suppresses NLRP3 inflammasome activation by sustaining p62-dependent autophagy/mitophagy, providing mechanistic depth to its anti-inflammatory role.","evidence":"scRNA-seq with conditional KO and bone marrow chimeras in lung IM refilling model; conditional KO macrophages with inflammasome assays, mitochondrial ROS measurement, and in vivo LPS/infection models","pmids":["36928411","37845329"],"confidence":"High","gaps":["Whether MAFB directly binds the p62/SQSTM1 promoter not shown","How MAFB integrates autophagy regulation with its other macrophage functions unclear"]},{"year":null,"claim":"Key unresolved questions include: (1) how heterodimer partner selection (Fos, Jun, Ets, ETS2) is regulated in different cellular contexts; (2) the structural basis of MAFB DNA-binding and partner discrimination; (3) genome-wide direct target identification by ChIP-seq in macrophages, alpha-cells, and microglia; and (4) the interplay between SUMOylation, proteasomal degradation, and MAFB's transcriptional output in vivo.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure of MAFB","No integrated genome-wide binding and expression dataset across multiple MAFB-dependent cell types","SUMO/ubiquitin cross-regulation of MAFB activity not dissected in vivo"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,5,6,7,14,15]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,5,6,8,14,24,30,32]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,2,14,29,32]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,5,6,8,14,24,30]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4,6,7,37,39,42]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[8,10,31,32,33,34]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,9,25,28]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[34]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[15,34]}],"complexes":[],"partners":["FOS","ETS1","ETS2","CREBBP","EP300","KAT2B","TET2","MAF"],"other_free_text":[]},"mechanistic_narrative":"MAFB is a bZIP transcription factor that homodimerizes or heterodimerizes with Fos-family proteins to bind Maf-recognition elements (MAREs), functioning as a context-dependent transcriptional activator or repressor across a remarkably broad range of developmental and immunological programs [PMID:7935473, PMID:25005477]. In hematopoietic lineages, MAFB drives monocyte-to-macrophage differentiation, promotes M2 macrophage polarization and foam-cell survival via LXR/AIM signaling, suppresses NLRP3 inflammasome activation through p62-dependent autophagy/mitophagy, antagonizes IRF3-coactivator interactions to dampen type I interferon responses, and cooperates with the glucocorticoid receptor and TET2 to establish tolerogenic dendritic cell identity [PMID:17548468, PMID:24445679, PMID:37845329, PMID:20581830, PMID:34893889]. In endocrine and epithelial tissues, MAFB directly activates glucagon, Pdx1, and Nephrin promoters to govern pancreatic alpha-/beta-cell specification, podocyte differentiation, and epidermal keratinocyte terminal differentiation [PMID:16443760, PMID:17360442, PMID:16847325, PMID:25805135]. Mutations in MAFB's transactivation domain cause Multicentric Carpotarsal Osteolysis through impaired negative regulation of osteoclastogenesis [PMID:24989131]."},"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":"20436469","id":"PMC_20436469","title":"A genome-wide association study of cleft 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via its basic region/leucine-zipper domain, repressing Ets-1 transactivation of synthetic promoters containing Ets binding sites and inhibiting Ets-1-mediated transactivation of the transferrin receptor gene, thereby blocking erythroid differentiation.\",\n      \"method\": \"Yeast one-hybrid screen, co-immunoprecipitation/interaction assays, transactivation reporter assays, overexpression in erythroblast cell line\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — yeast interaction screen, direct binding mapped to domain, functional reporter assays, and in-cell differentiation phenotype; single foundational paper with multiple orthogonal methods\",\n      \"pmids\": [\"8620536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"MafB forms homodimers through its leucine zipper and binds Maf-recognition elements (MAREs); it forms heterodimers with v-Maf and Fos but not Jun; acts as a transcriptional activator at MARE-linked promoters and transforms chicken embryo fibroblasts.\",\n      \"method\": \"Dimerization assays, DNA-binding assays (EMSA), transient cotransfection reporter assays, transformation assay in chicken embryo fibroblasts\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple biochemical assays (dimerization, DNA binding, transcription) plus functional transformation assay; foundational characterization paper\",\n      \"pmids\": [\"7935473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"SUMO-1 modifies MafB in vitro and in vivo on lysines 32 and 297; SUMOylation reduces MafB transactivation capacity and macrophage differentiation potential, and is required for v-Myb-mediated repression of MafB, thereby controlling the balance between myeloid progenitor expansion and terminal macrophage differentiation.\",\n      \"method\": \"In vitro SUMOylation assay, in vivo SUMO modification confirmed by immunoprecipitation, site-directed mutagenesis (K32R K297R), functional differentiation assays, inducible Myb allele system\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution of SUMOylation in vitro and in vivo, mutagenesis of SUMO sites, multiple functional readouts; single paper with orthogonal methods\",\n      \"pmids\": [\"17548468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ERK-induced MafB/Kreisler cooperates with GATA and Ets transcription factors to activate the megakaryocyte GPIIb/CD41 promoter; MafB is induced by ERK signaling during megakaryocyte differentiation and is required for GPIIb promoter transactivation within the proximal 114 bp.\",\n      \"method\": \"Promoter deletion/mutation reporter assays, dominant-negative and antisense suppression of MafB, ERK activation experiments, transactivation assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function (dominant-negative, antisense) with specific promoter readout, combined with gain-of-function; multiple approaches in one study\",\n      \"pmids\": [\"15121870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"MafB is required for podocyte (glomerular visceral epithelial cell) differentiation; MafB-null mice show proteinuria, foot process effacement, and reduced expression of Podocin and Nephrin, acting downstream of Pod1 transcription factor.\",\n      \"method\": \"Mafb/GFP knock-in null mutant mice, histology, immunofluorescence, gene expression analysis, genetic epistasis with Pod1\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean null mutant with specific cellular phenotype and pathway placement downstream of Pod1; replicated across multiple papers\",\n      \"pmids\": [\"16847325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"MafB activates glucagon gene transcription through a conserved control element between nucleotides -77 to -51 of the glucagon promoter in islet alpha-cells; MafB is also expressed in developing alpha- and beta-cells.\",\n      \"method\": \"Reporter assays with glucagon promoter deletion constructs, immunohistochemistry, transgenic mouse analysis (Pax4 and Pax6 knockouts)\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — defined promoter element by deletion analysis, confirmed in multiple genetic backgrounds\",\n      \"pmids\": [\"16443760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"MafB is required for production of insulin+ and glucagon+ cells during pancreatic development and directly regulates transcription of Pdx1, Nkx6.1, and GLUT2 by binding within their endogenous control region sequences.\",\n      \"method\": \"MafB-null (kreisler) mouse analysis, chromatin immunoprecipitation (ChIP) at Pdx1, Nkx6.1, GLUT2 control regions, immunohistochemistry, in situ hybridization\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP demonstrating direct binding at endogenous loci plus null mutant phenotype; multiple target genes validated\",\n      \"pmids\": [\"17360442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"MafA and MafB regulate beta-cell-enriched Pdx1 expression exclusively through the Area II control region (-2153/-1923); MafA is bound to Area II in adult beta-cells by ChIP, and MafB binding was detected at Area II at embryonic day 18.5.\",\n      \"method\": \"Transient transfection reporter assays, quantitative ChIP, transgenic mouse analysis in MafB-/- background\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct binding shown by ChIP at specific regulatory element, functional reporter assays, and in vivo validation in knockout mice\",\n      \"pmids\": [\"18522939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MafB acts as a transcriptional antagonist of antiviral type I interferon responses by blocking recruitment of coactivators to IRF3 at the IFNB1 promoter; MafB first acts as a weak positive basal regulator at AP-1-like sites, then upon interferon elicitor-induced IRF3 recruitment, MafB impairs IRF3-coactivator interactions.\",\n      \"method\": \"Reporter assays, promoter occupancy experiments, mathematical modeling, coactivator interaction assays\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct mechanistic dissection of MafB-IRF3-coactivator interaction at specific promoter, supported by mathematical modeling\",\n      \"pmids\": [\"20581830\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"C/EBPβ isoform ratio (LAP vs. LIP), controlled by mTOR-dependent alternative translation, regulates osteoclastogenesis by modulating MafB expression; the LAP isoform promotes MafB expression while LIP suppresses it, placing MafB downstream of the mTOR/C/EBPβ pathway as a negative regulator of osteoclastogenesis.\",\n      \"method\": \"C/EBPβ mutant mouse strains, LIP knock-in mice, rapamycin treatment, MafB promoter reporter assays, ectopic expression of LAP/LIP in monocytes\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic models, pharmacological intervention, promoter activity assays; clear epistasis placing MafB downstream of mTOR/C/EBPβ\",\n      \"pmids\": [\"19440205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MafB promotes foam-cell survival by mediating LXR/RXR-induced expression of the apoptosis inhibitor AIM; in the absence of MafB, activated LXR/RXR fails to induce AIM expression, rendering macrophages prone to apoptosis and attenuating early atherosclerotic lesion formation.\",\n      \"method\": \"Mafb-deficient fetal liver cell hematopoietic reconstitution in LDL receptor-deficient mice, gene expression analysis, loss-of-function in macrophages\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo hematopoietic reconstitution with defined phenotype, mechanistic link to LXR/AIM pathway identified\",\n      \"pmids\": [\"24445679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Mafb drives postsynaptic density (PSD) formation in auditory ribbon synapses within spiral ganglion neurons (SGNs); Mafb acts downstream of the Gata3 transcriptional network, and restoration of Mafb rescues synapse defects in Gata3 mutants.\",\n      \"method\": \"Mafb mutant mouse analysis, synapse counting, electrophysiology (auditory brainstem responses), Gata3 mutant rescue by Mafb restoration, gain-of-function (increased Mafb accelerates synaptogenesis)\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — null mutant with specific cellular phenotype, epistasis rescue experiment (Mafb restores Gata3 mutant phenotype), gain-of-function confirmation\",\n      \"pmids\": [\"24327562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MafB expression in hematopoietic stem/progenitor cells imposes an epigenetic (DNA methylation) program that is preserved in mature B cells, providing a novel mechanism for plasma cell neoplasia initiation.\",\n      \"method\": \"Transgenic mice expressing MafB in HS/PCs, genome-scale DNA methylation profiling, gene expression profiling, comparison to human multiple myeloma gene signatures\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transgenic mouse model with genome-scale epigenome profiling; single lab but multiple genomic methods\",\n      \"pmids\": [\"22903061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Cdx1 directly represses early Mafb expression in the neural tube posterior to the r6/r7 boundary by binding to regulatory sequences within the Mafb locus, thereby defining the posterior Mafb expression boundary in hindbrain patterning.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), in situ hybridization, immunofluorescence, regulatory sequence analysis, Cdx1 mutant mouse analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP demonstrating direct Cdx1 binding to Mafb regulatory sequences, combined with genetic null mutant and expression analysis\",\n      \"pmids\": [\"21098558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MAFB is necessary and sufficient for epidermal progenitor differentiation; MAF:MAFB regulates 393 genes and binds (by ChIP-seq) to loci of downstream TFs including GRHL3, ZNF750, KLF4, and PRDM1; ANCR and TINCR lncRNAs act as upstream regulators of MAF:MAFB.\",\n      \"method\": \"Loss-of-function/gain-of-function in keratinocytes, kinetic transcriptome analysis, ChIP-seq for MAF:MAFB binding, epistasis with downstream TFs, lncRNA knockdown\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP-seq for genome-wide binding, sufficiency demonstrated, epistasis ordering within transcription factor network; multiple orthogonal methods\",\n      \"pmids\": [\"25805135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MafB/cFos heterodimers repress apoptosis while MafB/cJun heterodimers promote apoptosis in developing chick limb buds; MafB/cJun directly activates p63 and p73 expression to arrest the cell cycle and drive apoptosis during limb morphogenesis.\",\n      \"method\": \"ChIP-seq in chick limb buds, functional overexpression/knockdown, reporter assays, immunostaining for apoptosis markers\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP-seq identifying direct targets, mechanistic dissection of heterodimer-specific activities, functional assays; multiple orthogonal methods\",\n      \"pmids\": [\"25005477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"HTLV-1 HBZ heterodimerizes with MafB via each bZIP domain, abrogates MafB DNA-binding activity at MARE elements, and reduces steady-state MafB protein levels via the proteasome pathway.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation, luciferase reporter assays, proteasome inhibitor treatment, EMSA (MARE-bound MafB)\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal interaction assays, functional reporter, proteasome experiments; single lab but multiple methods\",\n      \"pmids\": [\"20506502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The mouse mafB promoter contains TATA-like, CCAAT-box, GC-box elements, and palindromic MAREs/E-box sequences; MyoD activates the mafB promoter and MafB positively auto-regulates its own expression through these elements.\",\n      \"method\": \"Transient transfection reporter assays with 5'-flanking region deletions, cotransfection with MyoD, RNase protection for transcription start site\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — promoter deletion analysis and cotransfection; single lab, mechanistic but limited to promoter context\",\n      \"pmids\": [\"10721736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The vitamin D3 monocyte differentiation pathway operates through a transactivation cascade: vitamin D3 receptor → Hox-A10 → MafB; Hox-A10 directly binds to a conserved site in the MafB promoter to upregulate MafB expression during monocyte differentiation.\",\n      \"method\": \"EMSA identifying Hox-A10 binding site in MafB promoter, luciferase reporter assays with promoter deletion/mutation, retroviral Hox-A10 transduction in human CD34+ progenitors, qRT-PCR\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct binding to MafB promoter shown by EMSA, functional reporter with deletion confirmation; single lab\",\n      \"pmids\": [\"18832725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TFE3 transcription factor directly activates MAFB expression by binding an EBox in the MAFB promoter; EBox deletion or mutation abolishes TFE3-mediated transactivation of the MAFB promoter.\",\n      \"method\": \"EMSA identifying TFE3-binding EBox in MAFB promoter, luciferase reporter assays, TFE3 ectopic expression and siRNA silencing in hematopoietic cells\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct binding by EMSA, reporter assay with mutagenesis confirmation; single lab\",\n      \"pmids\": [\"19332055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MafB promotes macrophage M2 polarization and cholesterol efflux from foam cells by directly upregulating key mediators of cholesterol efflux; MafB is itself regulated by metabolic/immunological stimuli including LXR-dependent and LXR-independent pathways, and is suppressed by miR-155 and miR-33.\",\n      \"method\": \"MafB overexpression/knockdown in macrophages, cholesterol efflux assays, gene expression analysis, miRNA regulation assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — functional assays with defined readouts (M2 markers, cholesterol efflux), single lab\",\n      \"pmids\": [\"28790455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Prolactin receptor (PRLR) signaling in maternal beta-cells is required for transient gestational expression of MafB in a subset of beta-cells; MafB deletion in maternal beta-cells causes gestational diabetes with inadequate beta-cell expansion and failure to induce PRLR-dependent target genes.\",\n      \"method\": \"Conditional PRLR and MafB knockout mice (floxed alleles), beta-cell-specific Cre, glucose tolerance testing, BrdU proliferation assay, gene expression analysis\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional knockout mouse models with specific metabolic phenotype; epistasis placing MafB downstream of PRLR signaling\",\n      \"pmids\": [\"27217483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MafB directly regulates Nephrin expression in podocytes (demonstrated by reporter assay); MafB overexpression in podocytes ameliorates diabetic nephropathy by maintaining Nephrin expression, upregulating glutathione peroxidase, and modulating Notch2 signaling.\",\n      \"method\": \"Nephrin promoter reporter assay, transgenic mice overexpressing Mafb in podocytes (nephrin promoter), streptozotocin-induced diabetes model, histology, biochemical assays\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reporter assay for direct transcriptional regulation, in vivo transgenic model with functional readout; single lab\",\n      \"pmids\": [\"24722438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MafB acts as a transcriptional regulator of epidermal keratinocyte differentiation; MafB-deficient mice show reduced expression of cornified envelope genes (filaggrin, repetin) and increased expression of lipid metabolism genes (Alox12e, Smpd3), with the upregulated genes enriched for targets of Gata3, Grhl3, and Klf4.\",\n      \"method\": \"MafB-knockout mouse analysis, transcriptional profiling, in vitro human keratinocyte differentiation, immunohistochemistry\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — null mutant with transcriptome profiling identifying specific gene targets; single lab\",\n      \"pmids\": [\"27208706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MafB is a critical regulator of glucagon expression and alpha-cell function in adult mice; MafB directly regulates glucagon gene expression, arginine transporter gene expression (affecting arginine-stimulated glucagon secretion), and alpha-cell identity maintenance.\",\n      \"method\": \"Endocrine cell-specific and tamoxifen-inducible Mafb knockout mice, gene expression analysis, hormone measurement, arginine stimulation tests\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple conditional knockout strategies with specific functional phenotypes; single lab but multiple genetic models\",\n      \"pmids\": [\"29378833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MAFB is rapidly induced by VEGF-C/VEGFR-3 signaling in lymphatic endothelial cells (LECs) and induces expression of PROX1 and other lymphatic differentiation markers; global Mafb-/- embryos show impaired lymphatic patterning in the skin.\",\n      \"method\": \"CAGE RNA-seq in LECs stimulated with VEGF-C, Mafb-null mouse analysis (E14.5 embryos), gene expression analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transcriptomic approach with defined pathway (VEGF-C→MAFB→PROX1) and null mutant confirmation; single lab\",\n      \"pmids\": [\"26549461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LEC-intrinsic MAFB controls lymphatic vascular morphogenesis during embryogenesis and tumor-induced lymphangiogenesis; conditional lymphatic-specific Mafb knockout shows increased lymphatic branching and enhanced tumor lymphangiogenesis.\",\n      \"method\": \"Conditional lymphatic-specific Mafb knockout mice (Prox1-Cre), embryonic lymphatic analysis, tumor implantation model, histology\",\n      \"journal\": \"Angiogenesis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific conditional knockout with defined anatomical and functional phenotypes; confirms LECs as intrinsic site of action\",\n      \"pmids\": [\"32307629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MafB drives cardiac neural crest transcription factor Sox10 expression; in MafB morphant chick embryos, Sox10 expression is specifically reduced in the cardiac neural crest.\",\n      \"method\": \"Transcriptome analysis of isolated cardiac neural crest (FoxD3-enhancer driven), MafB loss-of-function (morpholino), in situ hybridization for Sox10\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transcriptome-guided functional test with specific molecular target; single lab, morpholino approach\",\n      \"pmids\": [\"30236445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MAFB enhances oncogenic Notch1 signaling in T-ALL by binding ETS2 and interacting with acetyltransferases PCAF and P300, thereby recruiting coactivators to the Notch transcriptional complex; MAFB knockdown reduces expression of Notch1 targets MYC and HES1.\",\n      \"method\": \"Gain-of-function screen, co-immunoprecipitation of MAFB with ETS2 and PCAF/P300, luciferase reporter assays, mouse T-ALL models, shRNA knockdown in human T-ALL cells\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP demonstrating protein-protein interactions, functional loss-of-function with specific target gene readout, multiple cell and mouse models\",\n      \"pmids\": [\"29138297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MAFB can be SUMOylated by SUMO1 at lysine 32, and this modification is critical for cell cycle regulation by MAFB in colorectal cancer cells; SUMOylated MAFB directly regulates CDK6 transcription by binding its promoter.\",\n      \"method\": \"SUMO modification assays, K32 mutagenesis, ChIP for MAFB binding to CDK6 promoter, shRNA knockdown, xenograft in vivo tumor growth assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — site-specific SUMOylation mapped by mutagenesis, ChIP at endogenous target, in vivo xenograft validation; single lab\",\n      \"pmids\": [\"27829226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MafB is a direct transcriptional activator of MMP9 and IL-7R genes in human macrophages through MARE elements in their promoters; MafB is a downstream target of the IL-10/STAT3 signaling pathway that controls macrophage de-activation.\",\n      \"method\": \"EMSA and luciferase reporter assays for direct MARE-mediated activation, MafB inactivation/overexpression, IL-10/STAT3 pathway analysis in primary human macrophages\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct binding by EMSA with functional reporter confirmation, pathway epistasis; single lab with human primary cells\",\n      \"pmids\": [\"24472656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"COX-2/PGE2/EP4 signaling in kidney macrophages induces MafB expression following acute kidney injury; myeloid MafB deletion recapitulates myeloid COX-2 or EP4 deletion phenotypes (delayed recovery, persistent inflammation, increased fibrosis), placing MafB downstream of PGE2/EP4 as an anti-inflammatory mediator.\",\n      \"method\": \"Myeloid-specific COX-2, EP4, and Mafb conditional knockout mice, acute kidney injury model, gene expression analysis, histology\",\n      \"journal\": \"Kidney international\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — three parallel conditional knockout models with matching phenotypes establish epistasis; MafB placed downstream of COX-2/PGE2/EP4 axis\",\n      \"pmids\": [\"34774558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MAFB acts in synergy with the glucocorticoid receptor (GR) to drive tolerogenic dendritic cell differentiation; GR and MAFB both interact with methylcytosine dioxygenase TET2 and co-bind genomic loci undergoing specific demethylation; MAFB knockdown erases the tolerogenic phenotype and reverts specific DNA demethylation.\",\n      \"method\": \"Co-immunoprecipitation of GR and MAFB with TET2, ChIP-seq, ATAC-seq, RRBS methylation profiling, MAFB knockdown in tolDCs, transcriptome analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — protein-protein interactions (GR-MAFB-TET2), genome-wide binding and methylation profiling, functional knockdown; multiple orthogonal methods\",\n      \"pmids\": [\"34893889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MafB controls the transition from monocyte proliferation to lung interstitial macrophage (IM) subset specification during IM niche refilling; c-Maf specifically regulates the identity of the CD206+ IM subset downstream or in parallel to MafB.\",\n      \"method\": \"Inducible lung IM niche depletion/refilling model, time-course scRNA-seq, bone marrow chimeras, gene targeting (Mafb conditional KO), Csf1r inhibition\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo conditional KO combined with single-cell transcriptomics and bone marrow chimeras; replicated across multiple experimental approaches\",\n      \"pmids\": [\"36928411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MafB sustains p62 expression in macrophages, thereby maintaining autophagy/mitophagy, inhibiting mitochondrial damage and ROS production, and negatively regulating NLRP3 inflammasome activation; MafB protein is rapidly degraded by the ubiquitin/proteasome system.\",\n      \"method\": \"MafB knockdown and conditional KO macrophages, NLRP3 inflammasome activation assays, mitochondrial ROS and DNA assays, p62 expression analysis, in vivo LPS/infection models\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with specific mechanism (p62/autophagy axis), in vitro and in vivo phenotypes; multiple mechanistic layers tested\",\n      \"pmids\": [\"37845329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"miR-320a directly targets MafB mRNA (validated by AGO2 co-immunoprecipitation, luciferase reporter assay, and Western blotting); miR-320a-induced downregulation of MafB causes podocyte loss and dysfunction by reducing Nephrin and Gpx3 expression.\",\n      \"method\": \"AGO2 co-immunoprecipitation, luciferase 3'UTR reporter assay, Western blotting, adeno-associated viral delivery in db/db mice, MafB re-expression rescue\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct miRNA-target interaction validated by multiple methods (AGO2 RIP, luciferase, rescue); single lab\",\n      \"pmids\": [\"31102503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MafB directly regulates parathyroid hormone (PTH) and cyclin D2 expression in parathyroid glands, as shown by reporter assay; MafB heterozygosity suppresses secondary hyperparathyroidism in a CKD mouse model.\",\n      \"method\": \"MafB heterozygous and tamoxifen-inducible KO mice, adenine-CKD model, promoter reporter assays for PTH and cyclin D2, RNA-seq of parathyroid glands\",\n      \"journal\": \"Kidney international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reporter assay for direct transcriptional control, genetic models with specific endocrine phenotype; single lab\",\n      \"pmids\": [\"28964572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MAFB knockout in human pluripotent stem cells (via CRISPR/Cas9) does not affect pancreatic progenitor specification but specifically impairs insulin- and glucagon-producing cell formation at the endocrine differentiation stage, favoring somatostatin- and pancreatic polypeptide-positive cells instead.\",\n      \"method\": \"CRISPR/Cas9 gene editing of hPSCs, endocrine differentiation protocol, immunostaining and flow cytometry for hormone-positive cell types\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean CRISPR KO in human system with specific stage-dependent phenotype; demonstrates species-specific role of MAFB in human beta-cell specification\",\n      \"pmids\": [\"32488111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MafB contributes to spinal microglial activation underlying neuropathic pain development; peripheral nerve injury increases MafB expression in spinal microglia (mediated partly by decreased miR-152), and MafB deficiency (heterozygous mice, siRNA, or conditional KO) alleviates mechanical hypersensitivity.\",\n      \"method\": \"Heterozygous Mafb-deficient mice, siRNA intrathecal delivery, conditional Mafb KO mice, intrathecal transfer of Mafb-deficient microglia, peripheral nerve injury model\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic and pharmacological loss-of-function approaches with consistent phenotype; cell-transfer experiment confirms microglial-intrinsic role\",\n      \"pmids\": [\"30485546\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Mafb and c-Maf have compensatory prenatal roles in repressing SST+ cortical interneuron generation from MGE secondary progenitors, and distinct postnatal roles in interneuron morphological maturation and synaptogenesis.\",\n      \"method\": \"Conditional single and double Mafb/c-Maf KO mice (MGE-specific Cre), interneuron counting, morphological analysis, electrophysiology\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — single and double conditional KO with stage-specific phenotypic dissection; clean genetic epistasis\",\n      \"pmids\": [\"30699346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MAFB mutations in the transactivation domain (amino acids 59-71) cause Multicentric Carpotarsal Osteolysis by reducing MAFB's ability to negatively regulate RANKL-mediated osteoclastogenesis; all pathogenic MAFB mutations cluster in this 13 amino acid stretch.\",\n      \"method\": \"Sequencing of MCTO patients, identification of domain-specific mutations, functional context from prior work on MAFB as negative regulator of RANKL-induced osteoclastogenesis\",\n      \"journal\": \"American journal of medical genetics. Part A\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — genetic mapping of disease mutations to functional domain; mechanistic inference from domain location, no direct functional assay in this paper\",\n      \"pmids\": [\"24989131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"A MAFB p.Leu239Pro substitution in the DNA-binding domain significantly reduces transactivation of the F4/80 promoter (a known MAFB recognition element) in cultured monocytes and impairs podocyte differentiation in neonatal mice.\",\n      \"method\": \"Luciferase transactivation assay in monocytes, immunohistochemistry of patient podocytes, podocyte differentiation assay in neonatal mice, structural modeling\",\n      \"journal\": \"Kidney international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct functional assay on mutant protein, in vivo validation in mice; single lab\",\n      \"pmids\": [\"29779709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Androgen receptor (AR) signaling is necessary for Mafb expression in male genital tubercle mesenchyme; Mafb is required for embryonic urethral masculinization, and androgen treatment fails to induce urethral masculinization in Mafb-null male mice.\",\n      \"method\": \"Mafb KO mice, AR KO mice, exogenous androgen treatment, morphological and gene expression analysis of genital tubercles\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — dual genetic models (Mafb KO, AR KO) with epistasis; androgen rescue experiment confirms pathway ordering\",\n      \"pmids\": [\"25362053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Androgen regulates Mafb expression through two functional androgen response elements (AREs) in the Mafb 3'UTR; androgen receptor binds these AREs in vivo during urethral masculinization; β-catenin is an additional regulator of Mafb expression.\",\n      \"method\": \"Luciferase reporter assays with Mafb 3'UTR, chromatin immunoprecipitation of AR at Mafb 3'UTR AREs in vivo, β-catenin cotransfection assays\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP demonstrating AR binding to Mafb 3'UTR in vivo, reporter assay functional validation; single lab\",\n      \"pmids\": [\"26636186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"MAFB ectopic expression in multiple myeloma cell lines (inducible system) upregulates 284 transcripts including 14 genes also activated by C-MAF; functional promoter assays confirm MAFB directly drives these target gene promoters; MAFB expression confers antiapoptotic effects.\",\n      \"method\": \"Inducible MAFB expression system, microarray profiling, promoter reporter assays, comparison with ex vivo MM gene expression data\",\n      \"journal\": \"Experimental hematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — inducible system with transcriptome readout and reporter validation; single lab but includes ex vivo confirmation\",\n      \"pmids\": [\"19013005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Maf and Mafb positively regulate Mef2c and Snap25 to drive cortical interneuron morphological maturation; Maf and Mafb promote Mef2c expression to specify parvalbumin+ interneurons; conditional double KO decreases cortical interneuron survival and alters physiological properties.\",\n      \"method\": \"Conditional double KO (Maf and Mafb) with MGE-specific Cre, scRNA-seq, gene expression validation, electrophysiology\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional double KO with scRNA-seq identifying specific gene targets and electrophysiological phenotype; multiple orthogonal approaches\",\n      \"pmids\": [\"32452758\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MAFB is a bZIP transcription factor that binds Maf-recognition elements (MAREs) as homodimers or heterodimers with Fos (but not Jun), acts as a context-dependent transcriptional activator or repressor, is SUMOylated on K32/K297 (which modulates its transactivation capacity and susceptibility to repression by Myb), regulates macrophage differentiation, alpha-cell glucagon production, podocyte differentiation, epidermal keratinocyte differentiation, and lymphatic vessel patterning, and mechanistically antagonizes IRF3-coactivator interactions to dampen antiviral interferon responses, directly activates target gene promoters (including glucagon, Nephrin, PDX1, GPIIb/CD41, PTH, cyclin D2, MMP9, IL-7R, Sox10, p63, p73), and controls NLRP3 inflammasome activation through p62-dependent autophagy/mitophagy in macrophages.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"MAFB is a bZIP transcription factor that homodimerizes or heterodimerizes with Fos-family proteins to bind Maf-recognition elements (MAREs), functioning as a context-dependent transcriptional activator or repressor across a remarkably broad range of developmental and immunological programs [PMID:7935473, PMID:25005477]. In hematopoietic lineages, MAFB drives monocyte-to-macrophage differentiation, promotes M2 macrophage polarization and foam-cell survival via LXR/AIM signaling, suppresses NLRP3 inflammasome activation through p62-dependent autophagy/mitophagy, antagonizes IRF3-coactivator interactions to dampen type I interferon responses, and cooperates with the glucocorticoid receptor and TET2 to establish tolerogenic dendritic cell identity [PMID:17548468, PMID:24445679, PMID:37845329, PMID:20581830, PMID:34893889]. In endocrine and epithelial tissues, MAFB directly activates glucagon, Pdx1, and Nephrin promoters to govern pancreatic alpha-/beta-cell specification, podocyte differentiation, and epidermal keratinocyte terminal differentiation [PMID:16443760, PMID:17360442, PMID:16847325, PMID:25805135]. Mutations in MAFB's transactivation domain cause Multicentric Carpotarsal Osteolysis through impaired negative regulation of osteoclastogenesis [PMID:24989131].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Establishing that MAFB functions as a bZIP transcription factor that homodimerizes and selectively heterodimerizes with Fos (not Jun) to bind MAREs and activate transcription answered the fundamental question of how this protein recognizes DNA and with which partners.\",\n      \"evidence\": \"Dimerization assays, EMSA, reporter assays, and transformation assay in chicken embryo fibroblasts\",\n      \"pmids\": [\"7935473\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal structure of MAFB homodimer or heterodimer on DNA\", \"Endogenous target genes not yet identified\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"The discovery that MAFB physically interacts with Ets-1 via its bZIP domain and represses Ets-1 transactivation revealed that MAFB can function as a transcriptional repressor through protein-protein interactions independent of MARE binding, blocking erythroid differentiation.\",\n      \"evidence\": \"Yeast one-hybrid, co-IP, reporter assays, and erythroblast differentiation in cell line\",\n      \"pmids\": [\"8620536\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance in primary erythroid cells not tested\", \"Whether MAFB-Ets-1 interaction occurs genome-wide or at select loci unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Parallel studies established MAFB as a direct activator of glucagon gene transcription through a conserved promoter element and as essential for podocyte differentiation (with null mice showing proteinuria and reduced Nephrin/Podocin), answering what endogenous tissues and target genes require MAFB.\",\n      \"evidence\": \"Glucagon promoter deletion/reporter assays; Mafb-null mice with kidney histology and gene expression analysis\",\n      \"pmids\": [\"16443760\", \"16847325\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct ChIP at glucagon promoter not yet performed in this study\", \"Mechanism of Nephrin/Podocin regulation not fully dissected\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"ChIP at endogenous Pdx1, Nkx6.1, and GLUT2 loci in the developing pancreas, combined with the null mutant phenotype, demonstrated that MAFB is a direct transcriptional regulator required for both insulin+ and glucagon+ cell production, extending its role beyond alpha-cells; simultaneously, SUMOylation at K32/K297 was shown to attenuate MAFB transactivation and mediate v-Myb repression, establishing a key post-translational regulatory mechanism.\",\n      \"evidence\": \"ChIP at endogenous loci in MafB-null pancreas; in vitro/in vivo SUMOylation assays with site-directed mutagenesis and differentiation readouts\",\n      \"pmids\": [\"17360442\", \"17548468\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SUMOylation affects MAFB DNA-binding genome-wide unknown\", \"SUMO E3 ligase specificity for MAFB not identified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Placing MAFB downstream of mTOR/C/EBPβ signaling as a negative regulator of osteoclastogenesis and downstream of TFE3 in hematopoietic cells defined the signaling inputs controlling MAFB expression in myeloid lineage decisions.\",\n      \"evidence\": \"C/EBPβ mutant and LIP knock-in mice with rapamycin; TFE3 EMSA/reporter assay with mutagenesis in hematopoietic cells\",\n      \"pmids\": [\"19440205\", \"19332055\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct C/EBPβ binding to MAFB promoter not shown by ChIP\", \"How mTOR/C/EBPβ and TFE3 inputs are integrated at the MAFB locus unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"The demonstration that MAFB antagonizes IRF3-coactivator interactions at the IFNB1 promoter revealed a dual-mode mechanism: MAFB first provides basal positive regulation via AP-1-like sites, then actively dampens virus-induced interferon responses by blocking coactivator recruitment, answering how MAFB modulates innate immunity.\",\n      \"evidence\": \"Reporter assays, promoter occupancy studies, coactivator interaction assays, mathematical modeling\",\n      \"pmids\": [\"20581830\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which specific coactivators are blocked not fully enumerated\", \"In vivo antiviral phenotype of Mafb-deficient macrophages not shown in this study\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Multiple concurrent discoveries broadened MAFB's functional scope: MafB/cJun heterodimers directly activate p63/p73 to drive apoptosis in limb morphogenesis, MAFB mediates LXR-dependent AIM expression for foam-cell survival in atherosclerosis, and MAFB directly activates MMP9 and IL-7R in macrophages through MARE elements, revealing heterodimer-specific transcriptional outputs and macrophage-specific target genes.\",\n      \"evidence\": \"ChIP-seq in chick limb buds; fetal liver reconstitution in LDLr-KO mice; EMSA/reporter in human macrophages\",\n      \"pmids\": [\"25005477\", \"24445679\", \"24472656\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How heterodimer partner choice (Fos vs Jun) is regulated in vivo remains unclear\", \"Whether AIM is a direct MAFB target or indirect via LXR not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"ChIP-seq in keratinocytes showed that MAF/MAFB directly binds loci of downstream transcription factors (GRHL3, ZNF750, KLF4, PRDM1) to drive epidermal differentiation, and VEGF-C/VEGFR-3 signaling was shown to rapidly induce MAFB in lymphatic endothelial cells where it activates PROX1, establishing MAFB as a master regulator in two new tissue contexts.\",\n      \"evidence\": \"ChIP-seq, loss/gain-of-function in keratinocytes, CAGE RNA-seq in LECs, Mafb-null embryo lymphatic analysis\",\n      \"pmids\": [\"25805135\", \"26549461\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct MAFB binding at PROX1 locus not confirmed by ChIP\", \"Genome-wide MAFB binding in LECs not performed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identification of MAFB transactivation domain mutations (aa 59-71) as causative for Multicentric Carpotarsal Osteolysis linked MAFB loss-of-function to a Mendelian skeletal disorder, while conditional PRLR-knockout studies placed MAFB downstream of prolactin signaling for gestational beta-cell expansion.\",\n      \"evidence\": \"Patient sequencing with domain mapping; conditional PRLR and MafB KO mice with glucose tolerance testing\",\n      \"pmids\": [\"24989131\", \"27217483\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct functional assay of MCTO mutations on osteoclastogenesis in this study\", \"MAFB transcriptional targets mediating beta-cell proliferation not identified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"MAFB was shown to enhance Notch1 signaling in T-ALL by recruiting coactivators PCAF/P300 through ETS2 interaction, and conditional adult alpha-cell knockout confirmed MAFB is continuously required for glucagon expression and alpha-cell identity, not just during development.\",\n      \"evidence\": \"Co-IP of MAFB-ETS2-PCAF/P300, reporter assays, shRNA in T-ALL cells; tamoxifen-inducible Mafb KO with arginine stimulation tests\",\n      \"pmids\": [\"29138297\", \"29378833\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MAFB-PCAF/P300 interaction is direct or bridged entirely by ETS2 not resolved\", \"Genome-wide MAFB targets in adult alpha-cells not mapped\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"MAFB was established as a regulator of cortical interneuron specification (compensatory with c-Maf in repressing SST+ interneuron generation, with distinct postnatal roles in maturation) and of spinal microglial activation in neuropathic pain, expanding its neural functions.\",\n      \"evidence\": \"Conditional single/double KO mice with MGE-specific Cre, electrophysiology; heterozygous/conditional Mafb KO with nerve injury model and intrathecal microglia transfer\",\n      \"pmids\": [\"30699346\", \"30485546\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets of MAFB in microglia driving pain sensitization not identified\", \"Mechanism by which MAFB and c-Maf achieve compensatory vs distinct functions unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Lymphatic-specific conditional knockout confirmed MAFB controls lymphatic vascular morphogenesis cell-autonomously, and human PSC knockout demonstrated a species-specific requirement for MAFB in human insulin+ and glucagon+ cell differentiation, while Maf/Mafb double-KO revealed Mef2c and Snap25 as key targets for interneuron maturation.\",\n      \"evidence\": \"Prox1-Cre conditional KO with tumor lymphangiogenesis model; CRISPR KO in hPSCs with endocrine differentiation; conditional double KO with scRNA-seq\",\n      \"pmids\": [\"32307629\", \"32488111\", \"32452758\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"MAFB binding sites at Mef2c and Snap25 loci not confirmed by ChIP\", \"Human-specific MAFB targets in beta-cell specification not mapped\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"The finding that MAFB interacts with TET2 and the glucocorticoid receptor to drive site-specific DNA demethylation during tolerogenic dendritic cell differentiation revealed a novel epigenetic mechanism through which MAFB shapes immune cell identity.\",\n      \"evidence\": \"Co-IP of GR-MAFB-TET2, ChIP-seq, ATAC-seq, RRBS methylation profiling, MAFB knockdown in tolDCs\",\n      \"pmids\": [\"34893889\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MAFB-TET2 interaction is direct or mediated by GR not resolved\", \"Catalytic dependence of TET2 on MAFB binding not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Two studies established that MAFB controls the monocyte-to-interstitial macrophage transition during lung niche refilling and suppresses NLRP3 inflammasome activation by sustaining p62-dependent autophagy/mitophagy, providing mechanistic depth to its anti-inflammatory role.\",\n      \"evidence\": \"scRNA-seq with conditional KO and bone marrow chimeras in lung IM refilling model; conditional KO macrophages with inflammasome assays, mitochondrial ROS measurement, and in vivo LPS/infection models\",\n      \"pmids\": [\"36928411\", \"37845329\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MAFB directly binds the p62/SQSTM1 promoter not shown\", \"How MAFB integrates autophagy regulation with its other macrophage functions unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: (1) how heterodimer partner selection (Fos, Jun, Ets, ETS2) is regulated in different cellular contexts; (2) the structural basis of MAFB DNA-binding and partner discrimination; (3) genome-wide direct target identification by ChIP-seq in macrophages, alpha-cells, and microglia; and (4) the interplay between SUMOylation, proteasomal degradation, and MAFB's transcriptional output in vivo.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure of MAFB\", \"No integrated genome-wide binding and expression dataset across multiple MAFB-dependent cell types\", \"SUMO/ubiquitin cross-regulation of MAFB activity not dissected in vivo\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 5, 6, 7, 14, 15]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 5, 6, 8, 14, 24, 30, 32]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 2, 14, 29, 32]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 5, 6, 8, 14, 24, 30]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4, 6, 7, 37, 39, 42]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [8, 10, 31, 32, 33, 34]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 9, 25, 28]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [34]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [15, 34]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"FOS\",\n      \"ETS1\",\n      \"ETS2\",\n      \"CREBBP\",\n      \"EP300\",\n      \"KAT2B\",\n      \"TET2\",\n      \"MAF\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}