{"gene":"MAFK","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":1993,"finding":"MafK encodes a small nuclear bZIP protein that lacks a transcriptional activation domain; when overexpressed via retroviral vector in chicken embryo fibroblasts, MafK protein localizes predominantly to the nucleus and does not induce morphological transformation but can promote colony formation in soft agar at low efficiency.","method":"Retroviral overexpression, immunofluorescence/subcellular fractionation, soft-agar colony assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, single-method localization with limited functional follow-up","pmids":["8361754"],"is_preprint":false},{"year":1995,"finding":"MafK binds to consensus NF-E2 sites in vitro in the absence of the large subunit p45, forming homodimers that repress transcription of NF-E2 site-dependent reporter genes; in the presence of p45, MafK confers sequence-specific DNA-binding activity to p45, and p45 in turn mediates transcriptional activation through its proline-rich domain.","method":"EMSA (in vitro DNA binding), transient transfection reporter assay, co-expression of p45 and MafK","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro binding assay combined with functional reporter assay; replicated in multiple cell systems","pmids":["7706310"],"is_preprint":false},{"year":1995,"finding":"Conditional overexpression of MafK in murine erythroleukemia cells induces hemoglobin accumulation (terminal erythroid differentiation) and increases NF-E2 DNA-binding activity containing MafK, demonstrating that MafK promotes the erythroid differentiation program.","method":"Metallothionein-inducible overexpression, hemoglobin assay, EMSA","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — conditional expression system with defined cellular phenotype and molecular readout","pmids":["7638211"],"is_preprint":false},{"year":1996,"finding":"Bach1 and Bach2 interact with MafK via bZIP heterodimerization (identified by yeast two-hybrid and confirmed in vitro binding to NF-E2 sites); Bach1/MafK and Bach2/MafK heterodimers bind NF-E2 recognition elements and function as transcriptional repressors in fibroblasts but show activator or repressor activity in erythroid cells depending on context.","method":"Yeast two-hybrid, in vitro EMSA, transient transfection reporter assay, native complex detection in brain cells","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (yeast two-hybrid, EMSA, reporter assay, native complex); foundational paper with >500 citations","pmids":["8887638"],"is_preprint":false},{"year":1996,"finding":"MafK expression during murine development is driven by two distinct promoters: a mesodermal promoter active from 7.5 dpc that directs expression in mesenchymal and hematopoietic cells, and a separate neuronal promoter located ~6 kb 3′ that drives MafK expression in neurons from ~13 dpc onward; in neurons, MafK associates with a partner molecule distinct from p45.","method":"Northern blot during development, transgenic reporter mice, in situ hybridization, co-immunoprecipitation","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"High","confidence_rationale":"Tier 2 — transgenic mouse promoter analysis combined with biochemical partner identification in neurons","pmids":["9140066"],"is_preprint":false},{"year":1996,"finding":"Targeted disruption of the p18 NF-E2 (MafK) gene in mice yields viable, healthy animals with normal erythropoiesis; NF-E2 heterodimer DNA-binding activity is retained in fetal liver erythroid cells of p18 NF-E2−/− mice, indicating that another small Maf family member can substitute for MafK in the p45/small-Maf NF-E2 complex in vivo.","method":"Homologous recombination knockout, EMSA on fetal liver nuclear extracts, phenotypic characterization","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — clean genetic knockout with biochemical and phenotypic analysis","pmids":["8622968"],"is_preprint":false},{"year":1997,"finding":"MafK (NF-E2p18) overexpression in Friend erythroleukemia cells increases NF-E2 DNA-binding activity and globin gene expression, while antisense inhibition of MafK blocks DMSO-induced differentiation; MafK is required to enhance NF-E2-dependent transcriptional activation during erythroid differentiation.","method":"Stable antisense/sense transfection, globin RT-PCR, EMSA, transient transfection reporter assay","journal":"Leukemia","confidence":"High","confidence_rationale":"Tier 2 — reciprocal gain- and loss-of-function with molecular readouts in the same cellular system","pmids":["9009092"],"is_preprint":false},{"year":2000,"finding":"The mafK hematopoietic and cardiac enhancer (HCEK), located 3′ to the mafK gene, drives tissue-specific expression in hematopoietic and cardiac muscle cells through two critical GATA-binding motifs; GATA-1 occupies these sites in hematopoietic cells and GATA-4/-6 in cardiac tissue, demonstrating that distinct GATA factors regulate mafK transcription through the same cis-element.","method":"Transgenic mouse reporter assay, EMSA with GATA factors, deletion/mutation analysis of enhancer","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 — in vivo transgenic validation combined with in vitro binding and mutagenesis","pmids":["10856242"],"is_preprint":false},{"year":2000,"finding":"Compound homozygous mafG/mafK null mice die postnatally and display severe anemia with abnormal erythrocyte morphology and membrane protein composition, profound thrombocytopenia due to defective proplatelet formation, and neurological disorders, demonstrating that MafK and MafG functionally collaborate to regulate erythropoiesis, megakaryopoiesis, and neurological function.","method":"Compound germline knockout, hematological analysis, erythrocyte membrane protein analysis, platelet counts","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — compound genetic knockout with multiple orthogonal phenotypic readouts; independent replication of mafG single-null phenotypes","pmids":["10716933"],"is_preprint":false},{"year":2000,"finding":"MafG and MafK homodimers bind the antioxidant response element (ARE) of the NQO1 gene in vitro; overexpression of either small Maf protein negatively regulates ARE-mediated expression and antioxidant induction of NQO1 and GST Ya genes by competing with Nrf2, while Maf-Nrf1 heterodimers fail to bind the NQO1 ARE.","method":"EMSA (band and supershift assay), transient transfection reporter assay in HepG2 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro DNA-binding combined with functional reporter assay; replicated for two small Maf paralogs","pmids":["11013233"],"is_preprint":false},{"year":2002,"finding":"MafK is an NGF-responsive immediate early gene in PC12 cells; NGF selectively elevates MafK transcript and protein levels through an atypical PKC isoform (but not MEK, PLCγ, or PI3K). Suppression of MafK by siRNA or dominant-negative strategies inhibits NGF-promoted neurite outgrowth and maintenance, establishing MafK as a regulator of neuronal differentiation downstream of NGF/PKC signaling.","method":"Serial analysis of gene expression (SAGE), Northern/Western blot, pharmacological inhibitors, siRNA knockdown, dominant-negative overexpression, neurite outgrowth assay","journal":"The Journal of neuroscience : the official journal of the Society for Neuroscience","confidence":"High","confidence_rationale":"Tier 2 — multiple inhibitor approaches plus siRNA knockdown with defined morphological phenotype","pmids":["12388604"],"is_preprint":false},{"year":2004,"finding":"The Nrf2/MafK heterodimer binds the GST-P gene enhancer element GPE1 in vitro (EMSA and footprinting) and activates GST-P reporter gene expression; chromatin immunoprecipitation demonstrates that both Nrf2 and MafK occupy GPE1 in pre-neoplastic hepatocytes and hepatoma cells but not in normal hepatocytes, establishing the Nrf2/MafK heterodimer as the activator of GST-P during hepatocarcinogenesis.","method":"EMSA, DNase I footprinting, luciferase reporter assay, ChIP, Northern blot","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal methods including in vitro binding, mutagenesis of GPE1, and ChIP in vivo","pmids":["14960151"],"is_preprint":false},{"year":2008,"finding":"NF-κB p65 recruits HDAC3 to the ARE by facilitating the interaction of HDAC3 with MafK (as well as with CBP), leading to local histone deacetylation and repression of ARE-driven gene expression; this identifies MafK as a direct co-repressor scaffold at the ARE for HDAC3 in the context of NF-κB-mediated suppression of Nrf2 target genes.","method":"Co-immunoprecipitation, ChIP, reporter assay, siRNA knockdown, overexpression","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP plus ChIP and reporter assay; multiple orthogonal methods in a single study","pmids":["18241676"],"is_preprint":false},{"year":2013,"finding":"TGF-β induces transcription of MafK (and Bach1); elevated MafK expression is sufficient to suppress electrophile-inducible HO-1 expression even in the presence of nuclear Nrf2. Pretreatment with TGF-β suppresses Nrf2 binding to ARE sites E1 and E2 while marginally increasing MafK binding to E2 together with Smads. siRNA knockdown of MafK and Bach1 together abolishes TGF-β-dependent HO-1 suppression.","method":"siRNA knockdown, ChIP, Western blot, reporter assay, overexpression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple methods (siRNA, ChIP, reporter) with reciprocal gain/loss-of-function","pmids":["23737527"],"is_preprint":false},{"year":2013,"finding":"JDP2 directly binds the ARE core sequence and physically associates with both Nrf2 and MafK via bZIP domains; JDP2 increases DNA-binding activity of the Nrf2-MafK complex to the ARE and is required for full transcriptional activation of ARE-dependent genes including HO-1, GCLC, GCLM, NQO1; Jdp2-knockout MEFs show impaired ARE-gene induction and accumulate intracellular ROS.","method":"ChIP-qPCR, EMSA, ARE-reporter assay, Jdp2 knockout MEFs, ROS measurement","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro binding, genetic KO, and multiple functional assays in same study","pmids":["24232097"],"is_preprint":false},{"year":2015,"finding":"Compound Mafg−/−:Mafk+/− mice develop progressive lens defects and cataract by 4 months; microarray profiling of lens identifies 97 differentially regulated genes including oxidative stress, sterol synthesis, and other non-crystallin cataract-associated genes, establishing MafK (in cooperation with MafG) as a transcriptional regulator of non-crystallin genes in lens fiber cells.","method":"Compound null-allelic mouse genetics, phenotypic characterization, microarray expression profiling, bioinformatics integration with known Maf binding motifs","journal":"Human genetics","confidence":"High","confidence_rationale":"Tier 2 — genetic mouse model with defined phenotype and genome-wide expression profiling","pmids":["25896808"],"is_preprint":false},{"year":2017,"finding":"MAFK is induced by TGF-β signaling in triple-negative breast cancer; overexpression of MAFK in mouse mammary NMuMG cells induces EMT phenotypes and promotes tumor formation and invasion in vivo; MAFK directly drives transcription of GPNMB. Knockdown of MAFK in tumor cells suppresses tumor growth and progression, identifying GPNMB as a functionally important MAFK target gene in TNBC malignant progression.","method":"MAFK overexpression and knockdown (siRNA/shRNA), in vivo mouse subcutaneous implantation, EMT phenotyping, transcriptional reporter/target gene analysis","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 — reciprocal gain/loss-of-function with in vivo tumor models and defined target gene","pmids":["28400538"],"is_preprint":false},{"year":2014,"finding":"In zebrafish, MafK partners with Bach1b at MARE sites in zymogen gene promoters to repress transcription, and partners with Nrf2a to activate transcription; heme stimulates exchange of Bach1b for Nrf2a at MafK-occupied MARE sites as shown by ChIP. This reveals MafK as the DNA-tethering subunit mediating heme-dependent switching between repressive Bach1b-MafK and activating Nrf2a-MafK heterodimers.","method":"ChIP assay, luciferase reporter assay, overexpression and morpholino knockdown in zebrafish","journal":"Disease models & mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and reporter assay in zebrafish ortholog model; ortholog function consistent with mammalian MafK","pmids":["24652768"],"is_preprint":false}],"current_model":"MAFK (small Maf family protein K) is a nuclear bZIP transcription factor that lacks an intrinsic activation domain and functions as both a transcriptional repressor (as a homodimer binding MAREs/NF-E2/ARE sites) and as an obligatory DNA-tethering partner for CNC-family proteins (p45 NF-E2, Nrf1, Nrf2) and Bach proteins (Bach1, Bach2), whose heterodimers either activate or repress ARE/NF-E2-dependent target genes (including globin genes, phase-II detoxifying enzymes such as NQO1 and GST-P, and HO-1) depending on partner identity and cellular context; TGF-β induces MAFK expression to suppress Nrf2-dependent antioxidant genes, NF-κB p65 recruits HDAC3 via MafK to the ARE to silence Nrf2 targets, NGF regulates MafK via atypical PKC to promote neuronal differentiation, and in triple-negative breast cancer MAFK drives EMT and malignant progression by transcriptionally inducing GPNMB."},"narrative":{"teleology":[{"year":1993,"claim":"Identification of MafK as a nuclear bZIP protein lacking an activation domain established the structural basis for its subsequent characterization as an activation-domain-dependent heterodimerization partner rather than an autonomous activator.","evidence":"Retroviral overexpression in chicken embryo fibroblasts with immunofluorescence localization and transformation assays","pmids":["8361754"],"confidence":"Medium","gaps":["Single-lab characterization without independent replication of localization","No dimerization partners or DNA targets identified","Soft-agar phenotype not mechanistically explained"]},{"year":1995,"claim":"Demonstrating that MafK homodimers repress NF-E2 site-dependent transcription while p45/MafK heterodimers activate it resolved how a single factor could mediate opposing transcriptional outcomes—through partner-dependent switching—and that MafK overexpression induces erythroid differentiation by enhancing NF-E2 activity.","evidence":"EMSA and reporter assays with co-expressed p45 and MafK; conditional MafK overexpression in murine erythroleukemia cells with hemoglobin accumulation readout","pmids":["7706310","7638211"],"confidence":"High","gaps":["Identity of endogenous chromatin targets beyond NF-E2 sites unknown","Whether MafK is rate-limiting in vivo for erythropoiesis not established"]},{"year":1996,"claim":"Identification of Bach1 and Bach2 as bZIP heterodimerization partners that convert MafK into a transcriptional repressor at NF-E2 sites expanded the partner repertoire beyond p45 and introduced the concept of competitive partner exchange at MARE sites, while knockout of MafK alone showed functional redundancy with other small Mafs in vivo.","evidence":"Yeast two-hybrid, EMSA, reporter assays in erythroid and fibroblast cells for Bach partners; homologous recombination knockout of MafK in mice with hematological and EMSA analysis","pmids":["8887638","8622968"],"confidence":"High","gaps":["Which small Maf substitutes for MafK in knockout mice not determined","Relative affinities of Bach vs. CNC partners for MafK not measured","In vivo chromatin occupancy not assessed"]},{"year":2000,"claim":"Compound MafG/MafK knockout mice revealed that small Maf redundancy is limited—loss of both produces lethal anemia, thrombocytopenia, and neurological defects—while demonstration that MafK homodimers repress ARE-dependent antioxidant genes (NQO1, GST Ya) by competing with Nrf2 extended MafK's role from erythropoiesis to the oxidative stress response.","evidence":"Compound germline knockout with hematological and neurological phenotyping; EMSA and reporter assays in HepG2 cells for ARE binding and repression; transgenic enhancer analysis for mafK regulation by GATA factors","pmids":["10716933","11013233","10856242"],"confidence":"High","gaps":["Direct Nrf2/MafK heterodimer binding to ARE not shown in this study","Neurological phenotype mechanism unexplored","Megakaryocyte target genes not identified"]},{"year":2002,"claim":"Identifying MafK as an NGF-responsive immediate early gene required for neurite outgrowth established a non-hematopoietic role and connected MafK to atypical PKC signaling in neuronal differentiation.","evidence":"SAGE, Northern/Western blot, pharmacological inhibitors, siRNA knockdown, and neurite outgrowth assay in PC12 cells","pmids":["12388604"],"confidence":"High","gaps":["Target genes of MafK in neurons not identified","Which CNC/Bach partner operates in NGF-stimulated neurons unknown","Atypical PKC isoform specificity not resolved"]},{"year":2004,"claim":"ChIP demonstration that Nrf2/MafK heterodimers occupy the GST-P enhancer in preneoplastic hepatocytes but not normal liver provided the first in vivo chromatin evidence for context-dependent MafK partner occupancy and linked the complex to hepatocarcinogenesis.","evidence":"ChIP, EMSA, DNase I footprinting, and reporter assays in rat hepatocytes and hepatoma cells","pmids":["14960151"],"confidence":"High","gaps":["Whether MafK occupancy changes during tumor progression not tracked longitudinally","Mechanism of selective Nrf2/MafK recruitment in preneoplastic cells unknown"]},{"year":2008,"claim":"Showing that NF-κB p65 recruits HDAC3 to MafK at the ARE, causing histone deacetylation and silencing of Nrf2 targets, revealed MafK as a scaffold integrating inflammatory (NF-κB) and antioxidant (Nrf2) signaling at chromatin.","evidence":"Co-immunoprecipitation, ChIP, reporter assay, and siRNA in human cells","pmids":["18241676"],"confidence":"High","gaps":["Whether HDAC3/MafK interaction is direct or bridged by other factors not fully resolved","Genome-wide scope of NF-κB/MafK co-repression unknown"]},{"year":2013,"claim":"Demonstrating that TGF-β transcriptionally induces MafK (and Bach1) to suppress Nrf2 binding at the HO-1 ARE, and that JDP2 physically augments Nrf2/MafK DNA binding at ARE sites, defined upstream signals and cofactors that modulate the MafK partner-switching mechanism.","evidence":"siRNA knockdown, ChIP, reporter assays, and Jdp2-knockout MEFs with ROS measurement","pmids":["23737527","24232097"],"confidence":"High","gaps":["How TGF-β/Smad signaling mechanistically induces MafK transcription not fully delineated","Stoichiometric relationship among JDP2, Nrf2, and MafK at ARE not determined"]},{"year":2014,"claim":"ChIP in zebrafish showed that heme triggers displacement of Bach1b by Nrf2a at MafK-occupied MARE sites, providing direct in vivo evidence for the heme-dependent partner-exchange model at MafK-tethered elements.","evidence":"ChIP assay, reporter assay, and morpholino knockdown in zebrafish","pmids":["24652768"],"confidence":"Medium","gaps":["Zebrafish ortholog findings require confirmation in mammalian systems","Kinetics and mechanism of heme-triggered exchange not resolved"]},{"year":2015,"claim":"Compound MafG-null/MafK-heterozygous mice developing progressive cataract extended MafK's physiological roles to lens maintenance and identified non-crystallin oxidative stress and sterol synthesis genes as collaborative MafG/MafK targets.","evidence":"Compound allelic mouse model with phenotyping and microarray expression profiling of lens tissue","pmids":["25896808"],"confidence":"High","gaps":["Direct ChIP validation of MafK occupancy at identified lens target genes not performed","Whether cataract phenotype is Nrf2-dependent not tested"]},{"year":2017,"claim":"Identifying MAFK as a TGF-β-induced driver of EMT and GPNMB transcription in triple-negative breast cancer connected MafK's transcriptional function to tumor invasion and defined a specific oncogenic target gene.","evidence":"MAFK overexpression/knockdown, in vivo mouse tumor implantation, EMT phenotyping, and transcriptional target analysis in TNBC cells","pmids":["28400538"],"confidence":"High","gaps":["Whether MAFK acts via Nrf2 or other partners to induce GPNMB not determined","Genome-wide MAFK cistrome in TNBC not mapped","Therapeutic relevance of MAFK inhibition not tested"]},{"year":null,"claim":"A genome-wide map of MAFK's chromatin occupancy across tissues, and the rules governing competitive partner selection (Nrf2 vs. Bach1 vs. other CNC factors) at individual loci, remain undefined.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of MafK heterodimer selectivity exists","Genome-wide ChIP-seq across tissues and conditions not comprehensively reported","Post-translational regulation of MafK protein stability and partner affinity largely unexplored"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,3,9,11,14]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,2,6,9,11,12,13,16]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1,2]}],"pathway":[{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[9,12,13,14]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10,13,16]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,4,8,10]}],"complexes":["NF-E2 (p45/MafK)","Nrf2/MafK","Bach1/MafK","Bach2/MafK"],"partners":["NFE2","NRF2","BACH1","BACH2","MAFG","JDP2","HDAC3","RELA"],"other_free_text":[]},"mechanistic_narrative":"MAFK is a small nuclear bZIP transcription factor that lacks an intrinsic activation domain and functions as a context-dependent transcriptional switch at MARE/NF-E2/ARE cis-elements: as a homodimer it represses target genes, while as an obligatory DNA-tethering partner for CNC-family (p45 NF-E2, Nrf2) or Bach-family (Bach1, Bach2) proteins it mediates activation or repression depending on partner identity [PMID:7706310, PMID:8887638, PMID:11013233]. In erythroid cells, the p45/MafK heterodimer drives globin gene expression and terminal differentiation, with functional redundancy among small Maf paralogs revealed by the normal erythropoiesis of MafK-null mice versus the severe anemia and thrombocytopenia of compound MafG/MafK knockouts [PMID:7638211, PMID:8622968, PMID:10716933]. At antioxidant response elements, MafK serves as a scaffold for signal-dependent partner exchange—TGF-β and NF-κB p65/HDAC3 signaling increase MafK-mediated repression of Nrf2 targets such as HO-1 and NQO1, whereas heme promotes displacement of repressive Bach1 by activating Nrf2 on MafK-occupied sites [PMID:23737527, PMID:18241676, PMID:24652768]. Beyond the antioxidant response, MAFK is induced by NGF via atypical PKC to promote neuronal differentiation and is co-opted by TGF-β signaling in triple-negative breast cancer to drive EMT and tumor progression through transcriptional induction of GPNMB [PMID:12388604, PMID:28400538]."},"prefetch_data":{"uniprot":{"accession":"O60675","full_name":"Transcription factor MafK","aliases":["Erythroid transcription factor NF-E2 p18 subunit"],"length_aa":156,"mass_kda":17.5,"function":"Since they lack a putative transactivation domain, the small Mafs behave as transcriptional repressors when they dimerize among themselves (PubMed:9150357). However, they act as transcriptional activators by dimerizing with other (usually larger) basic-zipper proteins, such as NFE2, NFE2L1/NRF1, NFE2L2/NRF2 and NFE2L3/NRF3, and recruiting them to specific DNA-binding sites (PubMed:8932385, PubMed:9150357). Small Maf proteins heterodimerize with Fos and may act as competitive repressors of the NF-E2 transcription factor (PubMed:9150357)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/O60675/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MAFK","classification":"Not Classified","n_dependent_lines":29,"n_total_lines":1208,"dependency_fraction":0.024006622516556293},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MAFK","total_profiled":1310},"omim":[{"mim_id":"605394","title":"BTB AND CNC HOMOLOGY 2; BACH2","url":"https://www.omim.org/entry/605394"},{"mim_id":"604135","title":"NUCLEAR FACTOR ERYTHROID 2-LIKE 3; NFE2L3","url":"https://www.omim.org/entry/604135"},{"mim_id":"602751","title":"BTB AND CNC HOMOLOGY 1; BACH1","url":"https://www.omim.org/entry/602751"},{"mim_id":"602020","title":"MAF bZIP TRANSCRIPTION FACTOR G; MAFG","url":"https://www.omim.org/entry/602020"},{"mim_id":"601637","title":"CYTOCHROME P450, FAMILY 51, SUBFAMILY A, POLYPEPTIDE 1; CYP51A1","url":"https://www.omim.org/entry/601637"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/MAFK"},"hgnc":{"alias_symbol":["P18","NFE2U"],"prev_symbol":[]},"alphafold":{"accession":"O60675","domains":[{"cath_id":"1.20.5.170","chopping":"27-124","consensus_level":"medium","plddt":96.8121,"start":27,"end":124}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O60675","model_url":"https://alphafold.ebi.ac.uk/files/AF-O60675-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O60675-F1-predicted_aligned_error_v6.png","plddt_mean":83.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MAFK","jax_strain_url":"https://www.jax.org/strain/search?query=MAFK"},"sequence":{"accession":"O60675","fasta_url":"https://rest.uniprot.org/uniprotkb/O60675.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O60675/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O60675"}},"corpus_meta":[{"pmid":"8001816","id":"PMC_8001816","title":"Growth suppression by p18, a p16INK4/MTS1- and p14INK4B/MTS2-related CDK6 inhibitor, correlates with wild-type pRb function.","date":"1994","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/8001816","citation_count":765,"is_preprint":false},{"pmid":"7739547","id":"PMC_7739547","title":"Novel INK4 proteins, p19 and p18, are specific inhibitors of the cyclin D-dependent kinases CDK4 and CDK6.","date":"1995","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/7739547","citation_count":618,"is_preprint":false},{"pmid":"18241676","id":"PMC_18241676","title":"NF-kappaB/p65 antagonizes Nrf2-ARE pathway by depriving CBP from Nrf2 and facilitating recruitment of HDAC3 to MafK.","date":"2008","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/18241676","citation_count":576,"is_preprint":false},{"pmid":"8887638","id":"PMC_8887638","title":"Bach proteins belong to a novel family of BTB-basic leucine zipper transcription factors that interact with MafK and regulate transcription through the NF-E2 site.","date":"1996","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/8887638","citation_count":567,"is_preprint":false},{"pmid":"9639410","id":"PMC_9639410","title":"Review of alterations of the cyclin-dependent kinase inhibitor INK4 family genes p15, p16, p18 and p19 in human leukemia-lymphoma cells.","date":"1998","source":"Leukemia","url":"https://pubmed.ncbi.nlm.nih.gov/9639410","citation_count":350,"is_preprint":false},{"pmid":"9744866","id":"PMC_9744866","title":"CDK inhibitors p18(INK4c) and p27(Kip1) mediate two separate pathways to collaboratively suppress pituitary tumorigenesis.","date":"1998","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/9744866","citation_count":330,"is_preprint":false},{"pmid":"22685290","id":"PMC_22685290","title":"Elevation of highly up-regulated in liver cancer (HULC) by hepatitis B virus X protein promotes hepatoma cell proliferation via 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reports","url":"https://pubmed.ncbi.nlm.nih.gov/32945431","citation_count":23,"is_preprint":false},{"pmid":"12668976","id":"PMC_12668976","title":"p18(INK4c) collaborates with other CDK-inhibitory proteins in the regenerating liver.","date":"2003","source":"Hepatology (Baltimore, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/12668976","citation_count":23,"is_preprint":false},{"pmid":"15584024","id":"PMC_15584024","title":"Tumorigenesis in p27/p53- and p18/p53-double null mice: functional collaboration between the pRb and p53 pathways.","date":"2005","source":"Molecular carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/15584024","citation_count":21,"is_preprint":false},{"pmid":"26985855","id":"PMC_26985855","title":"CDKIs p18(INK4c) and p57(Kip2) are involved in quiescence of CML leukemic stem cells after treatment with TKI.","date":"2016","source":"Cell cycle (Georgetown, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/26985855","citation_count":21,"is_preprint":false},{"pmid":"21595987","id":"PMC_21595987","title":"Y-box protein-1/p18 fragment identifies malignancies in patients with chronic liver disease.","date":"2011","source":"BMC cancer","url":"https://pubmed.ncbi.nlm.nih.gov/21595987","citation_count":21,"is_preprint":false},{"pmid":"24652768","id":"PMC_24652768","title":"Heme acts through the Bach1b/Nrf2a-MafK pathway to regulate exocrine peptidase precursor genes in porphyric zebrafish.","date":"2014","source":"Disease models & mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/24652768","citation_count":20,"is_preprint":false},{"pmid":"10856242","id":"PMC_10856242","title":"One enhancer mediates mafK transcriptional activation in both hematopoietic and cardiac muscle cells.","date":"2000","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/10856242","citation_count":20,"is_preprint":false},{"pmid":"3667522","id":"PMC_3667522","title":"Purification and properties of alpha-pinene oxide lyase from Nocardia sp. strain P18.3.","date":"1987","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/3667522","citation_count":20,"is_preprint":false},{"pmid":"15107819","id":"PMC_15107819","title":"Activation of protein kinase C promotes human cancer cell growth through downregulation of p18(INK4c).","date":"2004","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/15107819","citation_count":20,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49699,"output_tokens":4565,"usd":0.108786},"stage2":{"model":"claude-opus-4-6","input_tokens":8075,"output_tokens":3267,"usd":0.183075},"total_usd":0.291861,"stage1_batch_id":"msgbatch_01Mgbec4vM6c9vXht7JVJzss","stage2_batch_id":"msgbatch_01JkuuH5RB2BdJNsgnhjbC6s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1993,\n      \"finding\": \"MafK encodes a small nuclear bZIP protein that lacks a transcriptional activation domain; when overexpressed via retroviral vector in chicken embryo fibroblasts, MafK protein localizes predominantly to the nucleus and does not induce morphological transformation but can promote colony formation in soft agar at low efficiency.\",\n      \"method\": \"Retroviral overexpression, immunofluorescence/subcellular fractionation, soft-agar colony assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, single-method localization with limited functional follow-up\",\n      \"pmids\": [\"8361754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"MafK binds to consensus NF-E2 sites in vitro in the absence of the large subunit p45, forming homodimers that repress transcription of NF-E2 site-dependent reporter genes; in the presence of p45, MafK confers sequence-specific DNA-binding activity to p45, and p45 in turn mediates transcriptional activation through its proline-rich domain.\",\n      \"method\": \"EMSA (in vitro DNA binding), transient transfection reporter assay, co-expression of p45 and MafK\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro binding assay combined with functional reporter assay; replicated in multiple cell systems\",\n      \"pmids\": [\"7706310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Conditional overexpression of MafK in murine erythroleukemia cells induces hemoglobin accumulation (terminal erythroid differentiation) and increases NF-E2 DNA-binding activity containing MafK, demonstrating that MafK promotes the erythroid differentiation program.\",\n      \"method\": \"Metallothionein-inducible overexpression, hemoglobin assay, EMSA\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional expression system with defined cellular phenotype and molecular readout\",\n      \"pmids\": [\"7638211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Bach1 and Bach2 interact with MafK via bZIP heterodimerization (identified by yeast two-hybrid and confirmed in vitro binding to NF-E2 sites); Bach1/MafK and Bach2/MafK heterodimers bind NF-E2 recognition elements and function as transcriptional repressors in fibroblasts but show activator or repressor activity in erythroid cells depending on context.\",\n      \"method\": \"Yeast two-hybrid, in vitro EMSA, transient transfection reporter assay, native complex detection in brain cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (yeast two-hybrid, EMSA, reporter assay, native complex); foundational paper with >500 citations\",\n      \"pmids\": [\"8887638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"MafK expression during murine development is driven by two distinct promoters: a mesodermal promoter active from 7.5 dpc that directs expression in mesenchymal and hematopoietic cells, and a separate neuronal promoter located ~6 kb 3′ that drives MafK expression in neurons from ~13 dpc onward; in neurons, MafK associates with a partner molecule distinct from p45.\",\n      \"method\": \"Northern blot during development, transgenic reporter mice, in situ hybridization, co-immunoprecipitation\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — transgenic mouse promoter analysis combined with biochemical partner identification in neurons\",\n      \"pmids\": [\"9140066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Targeted disruption of the p18 NF-E2 (MafK) gene in mice yields viable, healthy animals with normal erythropoiesis; NF-E2 heterodimer DNA-binding activity is retained in fetal liver erythroid cells of p18 NF-E2−/− mice, indicating that another small Maf family member can substitute for MafK in the p45/small-Maf NF-E2 complex in vivo.\",\n      \"method\": \"Homologous recombination knockout, EMSA on fetal liver nuclear extracts, phenotypic characterization\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic knockout with biochemical and phenotypic analysis\",\n      \"pmids\": [\"8622968\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"MafK (NF-E2p18) overexpression in Friend erythroleukemia cells increases NF-E2 DNA-binding activity and globin gene expression, while antisense inhibition of MafK blocks DMSO-induced differentiation; MafK is required to enhance NF-E2-dependent transcriptional activation during erythroid differentiation.\",\n      \"method\": \"Stable antisense/sense transfection, globin RT-PCR, EMSA, transient transfection reporter assay\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal gain- and loss-of-function with molecular readouts in the same cellular system\",\n      \"pmids\": [\"9009092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The mafK hematopoietic and cardiac enhancer (HCEK), located 3′ to the mafK gene, drives tissue-specific expression in hematopoietic and cardiac muscle cells through two critical GATA-binding motifs; GATA-1 occupies these sites in hematopoietic cells and GATA-4/-6 in cardiac tissue, demonstrating that distinct GATA factors regulate mafK transcription through the same cis-element.\",\n      \"method\": \"Transgenic mouse reporter assay, EMSA with GATA factors, deletion/mutation analysis of enhancer\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vivo transgenic validation combined with in vitro binding and mutagenesis\",\n      \"pmids\": [\"10856242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Compound homozygous mafG/mafK null mice die postnatally and display severe anemia with abnormal erythrocyte morphology and membrane protein composition, profound thrombocytopenia due to defective proplatelet formation, and neurological disorders, demonstrating that MafK and MafG functionally collaborate to regulate erythropoiesis, megakaryopoiesis, and neurological function.\",\n      \"method\": \"Compound germline knockout, hematological analysis, erythrocyte membrane protein analysis, platelet counts\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — compound genetic knockout with multiple orthogonal phenotypic readouts; independent replication of mafG single-null phenotypes\",\n      \"pmids\": [\"10716933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"MafG and MafK homodimers bind the antioxidant response element (ARE) of the NQO1 gene in vitro; overexpression of either small Maf protein negatively regulates ARE-mediated expression and antioxidant induction of NQO1 and GST Ya genes by competing with Nrf2, while Maf-Nrf1 heterodimers fail to bind the NQO1 ARE.\",\n      \"method\": \"EMSA (band and supershift assay), transient transfection reporter assay in HepG2 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro DNA-binding combined with functional reporter assay; replicated for two small Maf paralogs\",\n      \"pmids\": [\"11013233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"MafK is an NGF-responsive immediate early gene in PC12 cells; NGF selectively elevates MafK transcript and protein levels through an atypical PKC isoform (but not MEK, PLCγ, or PI3K). Suppression of MafK by siRNA or dominant-negative strategies inhibits NGF-promoted neurite outgrowth and maintenance, establishing MafK as a regulator of neuronal differentiation downstream of NGF/PKC signaling.\",\n      \"method\": \"Serial analysis of gene expression (SAGE), Northern/Western blot, pharmacological inhibitors, siRNA knockdown, dominant-negative overexpression, neurite outgrowth assay\",\n      \"journal\": \"The Journal of neuroscience : the official journal of the Society for Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple inhibitor approaches plus siRNA knockdown with defined morphological phenotype\",\n      \"pmids\": [\"12388604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The Nrf2/MafK heterodimer binds the GST-P gene enhancer element GPE1 in vitro (EMSA and footprinting) and activates GST-P reporter gene expression; chromatin immunoprecipitation demonstrates that both Nrf2 and MafK occupy GPE1 in pre-neoplastic hepatocytes and hepatoma cells but not in normal hepatocytes, establishing the Nrf2/MafK heterodimer as the activator of GST-P during hepatocarcinogenesis.\",\n      \"method\": \"EMSA, DNase I footprinting, luciferase reporter assay, ChIP, Northern blot\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal methods including in vitro binding, mutagenesis of GPE1, and ChIP in vivo\",\n      \"pmids\": [\"14960151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"NF-κB p65 recruits HDAC3 to the ARE by facilitating the interaction of HDAC3 with MafK (as well as with CBP), leading to local histone deacetylation and repression of ARE-driven gene expression; this identifies MafK as a direct co-repressor scaffold at the ARE for HDAC3 in the context of NF-κB-mediated suppression of Nrf2 target genes.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, reporter assay, siRNA knockdown, overexpression\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus ChIP and reporter assay; multiple orthogonal methods in a single study\",\n      \"pmids\": [\"18241676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TGF-β induces transcription of MafK (and Bach1); elevated MafK expression is sufficient to suppress electrophile-inducible HO-1 expression even in the presence of nuclear Nrf2. Pretreatment with TGF-β suppresses Nrf2 binding to ARE sites E1 and E2 while marginally increasing MafK binding to E2 together with Smads. siRNA knockdown of MafK and Bach1 together abolishes TGF-β-dependent HO-1 suppression.\",\n      \"method\": \"siRNA knockdown, ChIP, Western blot, reporter assay, overexpression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods (siRNA, ChIP, reporter) with reciprocal gain/loss-of-function\",\n      \"pmids\": [\"23737527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"JDP2 directly binds the ARE core sequence and physically associates with both Nrf2 and MafK via bZIP domains; JDP2 increases DNA-binding activity of the Nrf2-MafK complex to the ARE and is required for full transcriptional activation of ARE-dependent genes including HO-1, GCLC, GCLM, NQO1; Jdp2-knockout MEFs show impaired ARE-gene induction and accumulate intracellular ROS.\",\n      \"method\": \"ChIP-qPCR, EMSA, ARE-reporter assay, Jdp2 knockout MEFs, ROS measurement\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro binding, genetic KO, and multiple functional assays in same study\",\n      \"pmids\": [\"24232097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Compound Mafg−/−:Mafk+/− mice develop progressive lens defects and cataract by 4 months; microarray profiling of lens identifies 97 differentially regulated genes including oxidative stress, sterol synthesis, and other non-crystallin cataract-associated genes, establishing MafK (in cooperation with MafG) as a transcriptional regulator of non-crystallin genes in lens fiber cells.\",\n      \"method\": \"Compound null-allelic mouse genetics, phenotypic characterization, microarray expression profiling, bioinformatics integration with known Maf binding motifs\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic mouse model with defined phenotype and genome-wide expression profiling\",\n      \"pmids\": [\"25896808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MAFK is induced by TGF-β signaling in triple-negative breast cancer; overexpression of MAFK in mouse mammary NMuMG cells induces EMT phenotypes and promotes tumor formation and invasion in vivo; MAFK directly drives transcription of GPNMB. Knockdown of MAFK in tumor cells suppresses tumor growth and progression, identifying GPNMB as a functionally important MAFK target gene in TNBC malignant progression.\",\n      \"method\": \"MAFK overexpression and knockdown (siRNA/shRNA), in vivo mouse subcutaneous implantation, EMT phenotyping, transcriptional reporter/target gene analysis\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal gain/loss-of-function with in vivo tumor models and defined target gene\",\n      \"pmids\": [\"28400538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In zebrafish, MafK partners with Bach1b at MARE sites in zymogen gene promoters to repress transcription, and partners with Nrf2a to activate transcription; heme stimulates exchange of Bach1b for Nrf2a at MafK-occupied MARE sites as shown by ChIP. This reveals MafK as the DNA-tethering subunit mediating heme-dependent switching between repressive Bach1b-MafK and activating Nrf2a-MafK heterodimers.\",\n      \"method\": \"ChIP assay, luciferase reporter assay, overexpression and morpholino knockdown in zebrafish\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and reporter assay in zebrafish ortholog model; ortholog function consistent with mammalian MafK\",\n      \"pmids\": [\"24652768\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MAFK (small Maf family protein K) is a nuclear bZIP transcription factor that lacks an intrinsic activation domain and functions as both a transcriptional repressor (as a homodimer binding MAREs/NF-E2/ARE sites) and as an obligatory DNA-tethering partner for CNC-family proteins (p45 NF-E2, Nrf1, Nrf2) and Bach proteins (Bach1, Bach2), whose heterodimers either activate or repress ARE/NF-E2-dependent target genes (including globin genes, phase-II detoxifying enzymes such as NQO1 and GST-P, and HO-1) depending on partner identity and cellular context; TGF-β induces MAFK expression to suppress Nrf2-dependent antioxidant genes, NF-κB p65 recruits HDAC3 via MafK to the ARE to silence Nrf2 targets, NGF regulates MafK via atypical PKC to promote neuronal differentiation, and in triple-negative breast cancer MAFK drives EMT and malignant progression by transcriptionally inducing GPNMB.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"MAFK is a small nuclear bZIP transcription factor that lacks an intrinsic activation domain and functions as a context-dependent transcriptional switch at MARE/NF-E2/ARE cis-elements: as a homodimer it represses target genes, while as an obligatory DNA-tethering partner for CNC-family (p45 NF-E2, Nrf2) or Bach-family (Bach1, Bach2) proteins it mediates activation or repression depending on partner identity [PMID:7706310, PMID:8887638, PMID:11013233]. In erythroid cells, the p45/MafK heterodimer drives globin gene expression and terminal differentiation, with functional redundancy among small Maf paralogs revealed by the normal erythropoiesis of MafK-null mice versus the severe anemia and thrombocytopenia of compound MafG/MafK knockouts [PMID:7638211, PMID:8622968, PMID:10716933]. At antioxidant response elements, MafK serves as a scaffold for signal-dependent partner exchange—TGF-β and NF-κB p65/HDAC3 signaling increase MafK-mediated repression of Nrf2 targets such as HO-1 and NQO1, whereas heme promotes displacement of repressive Bach1 by activating Nrf2 on MafK-occupied sites [PMID:23737527, PMID:18241676, PMID:24652768]. Beyond the antioxidant response, MAFK is induced by NGF via atypical PKC to promote neuronal differentiation and is co-opted by TGF-β signaling in triple-negative breast cancer to drive EMT and tumor progression through transcriptional induction of GPNMB [PMID:12388604, PMID:28400538].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Identification of MafK as a nuclear bZIP protein lacking an activation domain established the structural basis for its subsequent characterization as an activation-domain-dependent heterodimerization partner rather than an autonomous activator.\",\n      \"evidence\": \"Retroviral overexpression in chicken embryo fibroblasts with immunofluorescence localization and transformation assays\",\n      \"pmids\": [\"8361754\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab characterization without independent replication of localization\", \"No dimerization partners or DNA targets identified\", \"Soft-agar phenotype not mechanistically explained\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Demonstrating that MafK homodimers repress NF-E2 site-dependent transcription while p45/MafK heterodimers activate it resolved how a single factor could mediate opposing transcriptional outcomes—through partner-dependent switching—and that MafK overexpression induces erythroid differentiation by enhancing NF-E2 activity.\",\n      \"evidence\": \"EMSA and reporter assays with co-expressed p45 and MafK; conditional MafK overexpression in murine erythroleukemia cells with hemoglobin accumulation readout\",\n      \"pmids\": [\"7706310\", \"7638211\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of endogenous chromatin targets beyond NF-E2 sites unknown\", \"Whether MafK is rate-limiting in vivo for erythropoiesis not established\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Identification of Bach1 and Bach2 as bZIP heterodimerization partners that convert MafK into a transcriptional repressor at NF-E2 sites expanded the partner repertoire beyond p45 and introduced the concept of competitive partner exchange at MARE sites, while knockout of MafK alone showed functional redundancy with other small Mafs in vivo.\",\n      \"evidence\": \"Yeast two-hybrid, EMSA, reporter assays in erythroid and fibroblast cells for Bach partners; homologous recombination knockout of MafK in mice with hematological and EMSA analysis\",\n      \"pmids\": [\"8887638\", \"8622968\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which small Maf substitutes for MafK in knockout mice not determined\", \"Relative affinities of Bach vs. CNC partners for MafK not measured\", \"In vivo chromatin occupancy not assessed\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Compound MafG/MafK knockout mice revealed that small Maf redundancy is limited—loss of both produces lethal anemia, thrombocytopenia, and neurological defects—while demonstration that MafK homodimers repress ARE-dependent antioxidant genes (NQO1, GST Ya) by competing with Nrf2 extended MafK's role from erythropoiesis to the oxidative stress response.\",\n      \"evidence\": \"Compound germline knockout with hematological and neurological phenotyping; EMSA and reporter assays in HepG2 cells for ARE binding and repression; transgenic enhancer analysis for mafK regulation by GATA factors\",\n      \"pmids\": [\"10716933\", \"11013233\", \"10856242\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct Nrf2/MafK heterodimer binding to ARE not shown in this study\", \"Neurological phenotype mechanism unexplored\", \"Megakaryocyte target genes not identified\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identifying MafK as an NGF-responsive immediate early gene required for neurite outgrowth established a non-hematopoietic role and connected MafK to atypical PKC signaling in neuronal differentiation.\",\n      \"evidence\": \"SAGE, Northern/Western blot, pharmacological inhibitors, siRNA knockdown, and neurite outgrowth assay in PC12 cells\",\n      \"pmids\": [\"12388604\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Target genes of MafK in neurons not identified\", \"Which CNC/Bach partner operates in NGF-stimulated neurons unknown\", \"Atypical PKC isoform specificity not resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"ChIP demonstration that Nrf2/MafK heterodimers occupy the GST-P enhancer in preneoplastic hepatocytes but not normal liver provided the first in vivo chromatin evidence for context-dependent MafK partner occupancy and linked the complex to hepatocarcinogenesis.\",\n      \"evidence\": \"ChIP, EMSA, DNase I footprinting, and reporter assays in rat hepatocytes and hepatoma cells\",\n      \"pmids\": [\"14960151\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MafK occupancy changes during tumor progression not tracked longitudinally\", \"Mechanism of selective Nrf2/MafK recruitment in preneoplastic cells unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showing that NF-κB p65 recruits HDAC3 to MafK at the ARE, causing histone deacetylation and silencing of Nrf2 targets, revealed MafK as a scaffold integrating inflammatory (NF-κB) and antioxidant (Nrf2) signaling at chromatin.\",\n      \"evidence\": \"Co-immunoprecipitation, ChIP, reporter assay, and siRNA in human cells\",\n      \"pmids\": [\"18241676\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HDAC3/MafK interaction is direct or bridged by other factors not fully resolved\", \"Genome-wide scope of NF-κB/MafK co-repression unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrating that TGF-β transcriptionally induces MafK (and Bach1) to suppress Nrf2 binding at the HO-1 ARE, and that JDP2 physically augments Nrf2/MafK DNA binding at ARE sites, defined upstream signals and cofactors that modulate the MafK partner-switching mechanism.\",\n      \"evidence\": \"siRNA knockdown, ChIP, reporter assays, and Jdp2-knockout MEFs with ROS measurement\",\n      \"pmids\": [\"23737527\", \"24232097\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TGF-β/Smad signaling mechanistically induces MafK transcription not fully delineated\", \"Stoichiometric relationship among JDP2, Nrf2, and MafK at ARE not determined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"ChIP in zebrafish showed that heme triggers displacement of Bach1b by Nrf2a at MafK-occupied MARE sites, providing direct in vivo evidence for the heme-dependent partner-exchange model at MafK-tethered elements.\",\n      \"evidence\": \"ChIP assay, reporter assay, and morpholino knockdown in zebrafish\",\n      \"pmids\": [\"24652768\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Zebrafish ortholog findings require confirmation in mammalian systems\", \"Kinetics and mechanism of heme-triggered exchange not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Compound MafG-null/MafK-heterozygous mice developing progressive cataract extended MafK's physiological roles to lens maintenance and identified non-crystallin oxidative stress and sterol synthesis genes as collaborative MafG/MafK targets.\",\n      \"evidence\": \"Compound allelic mouse model with phenotyping and microarray expression profiling of lens tissue\",\n      \"pmids\": [\"25896808\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct ChIP validation of MafK occupancy at identified lens target genes not performed\", \"Whether cataract phenotype is Nrf2-dependent not tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identifying MAFK as a TGF-β-induced driver of EMT and GPNMB transcription in triple-negative breast cancer connected MafK's transcriptional function to tumor invasion and defined a specific oncogenic target gene.\",\n      \"evidence\": \"MAFK overexpression/knockdown, in vivo mouse tumor implantation, EMT phenotyping, and transcriptional target analysis in TNBC cells\",\n      \"pmids\": [\"28400538\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MAFK acts via Nrf2 or other partners to induce GPNMB not determined\", \"Genome-wide MAFK cistrome in TNBC not mapped\", \"Therapeutic relevance of MAFK inhibition not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A genome-wide map of MAFK's chromatin occupancy across tissues, and the rules governing competitive partner selection (Nrf2 vs. Bach1 vs. other CNC factors) at individual loci, remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of MafK heterodimer selectivity exists\", \"Genome-wide ChIP-seq across tissues and conditions not comprehensively reported\", \"Post-translational regulation of MafK protein stability and partner affinity largely unexplored\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 3, 9, 11, 14]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 2, 6, 9, 11, 12, 13, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:74160\", \"supporting_discovery_ids\": [1, 2, 6, 9, 11, 13, 16]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [9, 12, 13, 14]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 13, 16]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 4, 8, 10]}\n    ],\n    \"complexes\": [\n      \"NF-E2 (p45/MafK)\",\n      \"Nrf2/MafK\",\n      \"Bach1/MafK\",\n      \"Bach2/MafK\"\n    ],\n    \"partners\": [\n      \"NFE2\",\n      \"NRF2\",\n      \"BACH1\",\n      \"BACH2\",\n      \"MAFG\",\n      \"JDP2\",\n      \"HDAC3\",\n      \"RELA\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}