{"gene":"MAZ","run_date":"2026-04-28T18:30:28","timeline":{"discoveries":[{"year":1992,"finding":"MAZ (MYC-associated zinc finger protein) was cloned as a 477-amino acid zinc finger protein containing six Cys2His2-type zinc fingers, an N-terminal proline-rich domain, and polyalanine tracts. It binds specifically to the GA box sequence (GGGAGGG) found in the c-MYC P2 promoter, to the P2 attenuator region in the first exon, and to a related sequence involved in transcriptional termination of the C2 gene, suggesting dual roles in transcription initiation and termination.","method":"cDNA cloning from HeLa lambda gt11 library, in vitro DNA-binding assay with fusion protein, mutational analysis of binding sites","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — original cloning with in vitro binding reconstitution and mutational validation; foundational paper","pmids":["1502157"],"is_preprint":false},{"year":1992,"finding":"Pur-1 (MAZ) binds specifically to purine-rich GAGA boxes in the insulin gene promoter and acts as a potent transcriptional activator in both pancreatic and nonpancreatic cells, activating an intact insulin promoter in HeLa cells where it is normally inactive.","method":"cDNA cloning from insulinoma library, DNA-binding assay, transient transfection/transactivation assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — in vitro binding plus functional transactivation assay in multiple cell types; foundational paper","pmids":["1454839"],"is_preprint":false},{"year":1994,"finding":"MAZ binds to a consensus sequence G5AG5 in transcriptional termination regions between closely spaced human complement genes C2 and Factor B; mutation of MAZ binding sites severely reduces termination activity, and MAZ induces DNA bending, which is proposed to be important for termination function.","method":"In vitro protein-DNA binding, in vivo termination assay, mutational analysis of MAZ binding sites, DNA bending assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — in vitro binding reconstitution, mutagenesis, and in vivo functional termination assay with multiple orthogonal methods","pmids":["7988563"],"is_preprint":false},{"year":1996,"finding":"MAZ binds to four GC-rich sites in the serotonin 1a receptor gene promoter (identified by DNase I footprinting), three of which overlap Sp1 binding sites, and overproduction of MAZ in transient transfection substantially increases expression from the human serotonin 1a receptor promoter. One GC-rich sequence was also shown to function as a transcription initiator in vitro.","method":"cDNA cloning, DNase I footprinting, transient transfection/reporter assay, in vitro transcription initiation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — DNase I footprinting, in vitro transcription, and transactivation assays with multiple orthogonal methods","pmids":["8626793"],"is_preprint":false},{"year":1996,"finding":"THZif-1 (a MAZ-like zinc finger protein) binds specifically to the single-stranded pyrimidine-rich DNA of the c-MYC nuclease-hypersensitive element (NHE) with Kd ~0.077 µM; binding is enhanced by methylated cytosine on single-stranded DNA and is mediated primarily by the amino-terminal second zinc finger motif. It does not bind the purine-rich strand.","method":"EMSA with GST-fusion proteins, deletion mutant analysis, methylation analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro binding with mutagenesis, single lab","pmids":["8940139"],"is_preprint":false},{"year":1997,"finding":"Overexpression of ZF87/MAZ in COS cells significantly represses transcription from the murine c-myc P2 promoter through the ME1a2 element at -86 relative to the P2 start site. MAZ functions as a true transcriptional repressor independently of the c-myc promoter context (shown via GAL4 fusion), with the repressive domain mapping to the N-terminal proline/alanine-rich region.","method":"Transient transfection/reporter assay, GAL4 fusion repressor assay, deletion mapping","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal reporter assays with domain mapping and GAL4 fusion system","pmids":["10383467"],"is_preprint":false},{"year":1997,"finding":"MAZ is essential for ME1a1-mediated expression of c-myc during retinoic acid-induced neuroectodermal differentiation of P19 cells; MAZ DNA-binding activity kinetics closely correlated with changes in c-myc promoter activity during differentiation, and a construct lacking the ME1a1 site failed to show the MAZ-dependent transient increase.","method":"Reporter gene assay in P19 cells, EMSA with ME1a1 probe","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — reporter assay plus EMSA correlating binding activity with promoter activity during differentiation","pmids":["9294605"],"is_preprint":false},{"year":1997,"finding":"MAZ and Sp1 both activate expression from the adenovirus type 5 major late promoter by binding to GC-rich sequences flanking the TATA box (MAZ at -18 and -36; Sp1 at -18) and distal sites. Both transcription factors interact with adenovirus E1A protein as demonstrated by immunoprecipitation, and E1A enhances their activation.","method":"DNase I footprinting, transient transfection/reporter assay, mutational analysis, immunoprecipitation","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 1-2 — footprinting, mutagenesis, reporter assay, and Co-IP; multiple orthogonal methods","pmids":["9371624"],"is_preprint":false},{"year":1999,"finding":"MAZ is phosphorylated by casein kinase II (CKII) at serine 480 (the major site), and this phosphorylation is required for maximum DNA binding of MAZ to the pyrimidine-rich NHE of the c-myc promoter. Mutation of Ser480 to alanine eliminates DNA-binding activity and abolishes MAZ-mediated enhancement of c-myc promoter-driven luciferase expression in the presence of CKII.","method":"Site-specific mutagenesis, in vitro phosphorylation assay, EMSA, luciferase reporter assay","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 — in vitro phosphorylation with site-directed mutagenesis plus functional reporter assay","pmids":["10448092"],"is_preprint":false},{"year":2000,"finding":"FAC1 protein interacts with ZF87/MAZ, as identified by yeast two-hybrid and confirmed in vitro with recombinant proteins. The FAC1-MAZ interaction domain maps to the NLS/NES region of FAC1, while FAC1 recognizes a conformational interface including the proline/alanine-rich domain and first zinc finger of MAZ. Co-expression of FAC1 reduces ZF87/MAZ-induced transcriptional activation of an SV40 promoter in a dose-dependent manner.","method":"Yeast two-hybrid, recombinant protein pulldown, transient co-transfection/reporter assay, deletion mapping","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — yeast two-hybrid confirmed by in vitro pulldown, with functional reporter assay","pmids":["10727212"],"is_preprint":false},{"year":2000,"finding":"G-quartet structures formed by the insulin-linked polymorphic region (ILPR) in the insulin gene promoter influence Pur-1/MAZ-dependent transcriptional activity; inter- and intramolecular G-quartet formation correlates with changes in insulin transcription activity associated with IDDM2 diabetes susceptibility.","method":"G-quartet formation assay, transient transfection/reporter assay with mutant ILPR sequences","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — functional reporter assay with designed ILPR mutants and G-quartet structural analysis","pmids":["11070077"],"is_preprint":false},{"year":2001,"finding":"MAZ and Sp1 both interact with the same GC-rich cis-elements in the human MAZ gene promoter. The DNA-binding activities of Sp1 and MAZ depend mainly on consecutive zinc fingers: third and fourth zinc fingers of MAZ (zinc fingers 2 and 3 of Sp1). MAZ autorepresses its own promoter, with histone deacetylases involved in MAZ autorepression, while Sp1-mediated repression involves DNA methyltransferase 1.","method":"EMSA, deletion and mutational analysis, transient transfection/reporter assay, zinc finger domain mapping","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including domain mapping, binding assays, and mechanistic reporter experiments","pmids":["11259406","11395515"],"is_preprint":false},{"year":2002,"finding":"SP1 and MAZ bind to a 27 bp GC-rich region in the NR1 (NMDA receptor subunit 1) gene promoter; mutations in the SP1 and MAZ binding sites impair binding of both proteins and decrease NR1 promoter activity during neuronal differentiation of P19 cells, indicating both factors mediate enhancement of NR1 promoter activity.","method":"EMSA, mutational analysis, transient transfection/reporter assay","journal":"Brain research. Molecular brain research","confidence":"Medium","confidence_rationale":"Tier 2 — binding assay with mutagenesis and functional reporter assay","pmids":["12425938"],"is_preprint":false},{"year":2003,"finding":"MAZ and Sp1 competitively bind to overlapping sequences at -48 and -38 bp in the rat PNMT gene promoter; MAZ displaces Sp1 binding in a concentration-dependent manner, and their binding is mutually exclusive. Phosphorylation of both factors (shown by phosphatase treatment) is required for DNA binding. Despite higher affinity, MAZ is a less effective activator than Sp1, and MAZ preferentially increases intron-retaining mRNA.","method":"Gel mobility shift assay (EMSA) with in vitro translated proteins and nuclear extracts, phosphatase treatment, transient transfection/reporter assay, mutational analysis","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstituted binding competition with phosphorylation dependence, multiple orthogonal assays","pmids":["14573768"],"is_preprint":false},{"year":2004,"finding":"MAZ elements in the FGFR2 gene act as RNA polymerase II pause sites; insertion of a MAZ4 element at positions 5' of upstream silencing elements or between exon IIIb and downstream silencing elements decreases silencing of exon IIIb, while insertion 3' of downstream silencing elements has no effect. An RT-PCR elongation assay confirmed MAZ4 is a RNAPII pause site, and promoter identity alters the MAZ4 effect, linking MAZ-dependent RNAPII pausing to co-transcriptional alternative splicing decisions.","method":"Minigene transfection reporter assay, RT-PCR elongation assay, in vitro transcribed RNA transfection","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple complementary approaches establishing RNAPII pausing and its functional consequence on splicing","pmids":["15126509"],"is_preprint":false},{"year":2008,"finding":"MAZ binds the muscle creatine kinase (MCK) promoter element MPEX in vitro and in vivo (ChIP), transactivates the MCK promoter, and occupies promoters of multiple muscle genes (Skeletal alpha-actin, Desmin, alpha-Myosin heavy chain, Six4) in skeletal and cardiac myocytes. MAZ DNA-binding activity and transcript levels are upregulated during skeletal myocyte differentiation. MAZ also binds sequences diverging from its canonical GA box (e.g., CTCCTCCC) in muscle promoters.","method":"ICAT-based quantitative proteomics, in vitro DNA binding, chromatin immunoprecipitation (ChIP), transient transfection/reporter assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 — quantitative proteomics identification, in vitro binding, ChIP at endogenous loci, and transactivation assays","pmids":["18710939"],"is_preprint":false},{"year":2012,"finding":"miR-125b targets MAZ mRNA and is downregulated in glioblastoma-associated endothelial cells and upon VEGF exposure, resulting in increased MAZ expression. MAZ in turn transcriptionally activates VEGF, creating a feed-forward loop. Inhibition of MAZ accumulation by miR-125b or MAZ-specific shRNAs attenuates primary human brain endothelial cell migration and tubule formation in vitro.","method":"shRNA knockdown, miRNA overexpression, migration assay, tubule formation assay, transcriptional reporter assay","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 — shRNA knockdown with defined cellular phenotype and miRNA targeting, single lab","pmids":["22415301"],"is_preprint":false},{"year":2013,"finding":"MAZ activates KRAS transcription by binding to G-quadruplex structures in the KRAS promoter nuclease-hypersensitive element (NHE). G4-decoy oligonucleotides mimicking the NHE G-quadruplex competitively inhibit MAZ binding, suppress KRAS expression in pancreatic cancer cells, inhibit proliferation and colony formation, activate apoptosis, and reduce tumor xenograft growth by 64% in mice.","method":"Transcriptional reporter assay, G-quadruplex competitive binding assay, cell viability assay, xenograft mouse model","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1-2 — functional reporter assay, in vitro and in vivo experiments with mechanistic G4-decoy competition","pmids":["23471001"],"is_preprint":false},{"year":2014,"finding":"MAZ binds to two neighboring G-quadruplex structures in the HRAS promoter and unfolds them; in the presence of complementary strands, MAZ-GST promotes rapid transformation of HRAS quadruplexes into duplexes. Mutational dissection shows that the two neighboring G-quadruplexes synergistically repress HRAS transcription, and MAZ binding (unfolding) activates HRAS expression.","method":"In vitro G-quadruplex binding and unfolding assay with MAZ-GST fusion, mutational analysis of G-elements, transcriptional reporter assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro G-quadruplex unfolding with mutagenesis and functional reporter assay","pmids":["25013182"],"is_preprint":false},{"year":2014,"finding":"MAZ protein is essential for HIF2α-mediated activation of the Cav1 (caveolin-1) promoter in intestinal epithelial cells; HIF2α activates the Cav1 promoter in a HIF response element-independent manner, and MAZ is required for this activation. Hypoxic induction of CAV1 via HIF2α/MAZ suppresses occludin expression, disrupting intestinal barrier integrity and contributing to hypoxia-induced inflammation.","method":"Mouse models with intestine-specific HIF1α/HIF2α overexpression, promoter/reporter assay, siRNA knockdown","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo mouse model plus reporter assay, single lab","pmids":["24891620"],"is_preprint":false},{"year":2016,"finding":"Akt phosphorylates MAZ at Thr385, and this phosphorylation releases MAZ from the p53 promoter, leading to transcriptional activation of p53. MAZ functions as a transcriptional repressor of the p53 promoter.","method":"In vitro kinase assay, ChIP assay, reporter gene assay, site-directed mutagenesis","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 1-2 — kinase assay with mutagenesis and ChIP, but single lab","pmids":["26902421"],"is_preprint":false},{"year":2017,"finding":"MAZ purified from nuclear extracts (as the Myb-sp factor) directly binds the E2F element in the MYB promoter and activates transcription through it. Various MAZ isoforms are present in Myb-sp and activate MYB transcription. Co-expression of MAZ not only reverts RB/p130-mediated repression via the E2F element but activates transcription, and MAZ knockdown inhibits MYB expression during exit from quiescence.","method":"Protein purification, EMSA, luciferase reporter assay, ChIP, siRNA knockdown","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1-2 — biochemical purification, binding assay, ChIP, and reporter assay with knockdown; multiple orthogonal methods","pmids":["28973440"],"is_preprint":false},{"year":2018,"finding":"MAZ promotes pancreatic cancer cell invasiveness by increasing CRAF-ERK signaling (not by directly affecting K-Ras expression); this activation is mediated via PAK and AKT/PKB signaling cascades. The oncoprotein Cyr61/CCN1 regulates MAZ expression via Notch-1-sonic hedgehog signaling.","method":"siRNA knockdown, invasion/migration assay, western blot, western blot of signaling components","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with defined signaling phenotype, single lab","pmids":["29414775"],"is_preprint":false},{"year":2018,"finding":"MAZ knockdown in HEK293 cells results in differential expression of WNT morphogens Wnt11 and Wnt4, prevents efficient S phase transition, and abrogates growth of human embryonic kidney cells. In mice, homozygous CRISPR-Cas9 Maz deletion results in perinatal lethality with high penetrance of congenital anomalies of the kidney and urinary tract (CAKUTs), and Maz is haploinsufficient for normal bladder development.","method":"siRNA knockdown with transcriptome analysis, CRISPR-Cas9 mouse model, cell cycle assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — in vivo CRISPR mouse model with specific developmental phenotype plus mechanistic cell biology in human cells","pmids":["29432158"],"is_preprint":false},{"year":2019,"finding":"circ-CUX1 binds to EWSR1 to facilitate EWSR1 interaction with MAZ, resulting in transactivation of MAZ and transcriptional alteration of CUX1 and other genes associated with neuroblastoma progression. This circ-CUX1/EWSR1/MAZ axis promotes aerobic glycolysis in neuroblastoma.","method":"RNA pulldown, co-immunoprecipitation, luciferase reporter assay, inhibitory peptide and lentiviral knockdown","journal":"EMBO molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and reporter assay with functional rescue, single lab","pmids":["31709724"],"is_preprint":false},{"year":2019,"finding":"MAZ promotes bone metastasis of prostate cancer through transcriptional upregulation of KRas (and HRas) expression, with RalGEF signaling selectively mediating the pro-metastatic effect of KRas. ChIP and luciferase assays demonstrated MAZ binding to and activation of KRAS promoter.","method":"ChIP assay, luciferase reporter assay, transwell invasion assay, mouse intracardiac bone metastasis model","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and reporter plus in vivo model, single lab","pmids":["31488180"],"is_preprint":false},{"year":2020,"finding":"Disruption of Maz in mice produces developmental eye defects, with significant upregulation of Wnt2b, Sfrp2, and Fzd4 in Maz-deficient eyes, along with downregulation of the Wnt reporter TCF-Lef1, indicating MAZ is required for activation of the Wnt/β-catenin pathway and ciliary margin patterning.","method":"Conditional mouse Maz knockout, gene expression analysis, Wnt reporter assay","journal":"Disease models & mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo mouse KO with defined pathway phenotype, single lab","pmids":["32571845"],"is_preprint":false},{"year":2021,"finding":"MAZ, like CTCF, physically interacts with the cohesin subunit (Co-IP demonstrated) and can independently arrest cohesin sliding. MAZ also independently pauses the elongating form of RNA polymerase II and consequently affects RNA alternative splicing. CTCF/MAZ double sites are more effective at sequestering cohesin than CTCF-only sites. MAZ depletion disrupts local interactions within TADs and TAD boundaries, and MAZ binding between an enhancer and promoter results in down-regulation of reporter gene expression, supporting a role as an insulator protein.","method":"Co-immunoprecipitation, Hi-C, insulator reporter assay, siRNA depletion, RNAPII pausing assay, alternative splicing analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 — Co-IP, Hi-C, insulator reporter, and RNAPII pausing; multiple orthogonal methods","pmids":["33558242"],"is_preprint":false},{"year":2021,"finding":"MAZ identified by DNA affinity purification/mass spectrometry as binding to the alpha-globin gene promoter in primary human erythroid cells. Genome-wide ChIP-seq showed MAZ occupies active promoters and GATA1-bound enhancers of key erythroid genes. MAZ knockdown reduces alpha-globin expression in K562 cells and impairs differentiation in primary human erythroid cells.","method":"DNA affinity purification, mass spectrometry, ChIP-seq, siRNA knockdown, erythroid differentiation assay","journal":"Blood advances","confidence":"High","confidence_rationale":"Tier 1-2 — biochemical affinity purification, genome-wide ChIP, and functional knockdown with defined erythroid phenotype","pmids":["34351390"],"is_preprint":false},{"year":2022,"finding":"MAZ colocalizes with CTCF at chromatin borders and interacts with the cohesin subunit RAD21 (biochemical assay). CRISPR KO screen and MAZ motif deletions lead to derepression of posterior Hox genes immediately after CTCF boundaries upon differentiation, causing homeotic transformations in mice, establishing MAZ as a cofactor in CTCF-mediated genomic insulation at Hox clusters.","method":"Genome-wide CRISPR knockout screen, biochemical Co-IP, MAZ motif deletion, Hi-C, CRISPR mouse model","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 1-2 — genome-wide CRISPR screen with biochemical Co-IP, in vivo mouse phenotype, and multiple orthogonal methods","pmids":["35145304"],"is_preprint":false},{"year":2024,"finding":"G-quadruplexes in the CCND1 promoter recruit MAZ and propel motility in MAZ phase-separated condensates, activating CCND1 transcription. Zinc finger 2 of MAZ is responsible for G4 binding; ZF3-5 are critical for MAZ condensation. MAZ nuclear puncta overlap G4 signals and coactivators BRD4, MED1, CDK9, and active RNA polymerase II. MAZ mutants lacking either G4 binding or phase separation ability cannot form nuclear puncta and fail to promote hepatocellular carcinoma cell proliferation.","method":"Mutagenesis of MAZ zinc fingers, phase separation assay, co-localization (immunofluorescence), G4 binding assay, xenograft tumor model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — structure-function mutagenesis, reconstituted phase separation, and in vivo xenograft validation; multiple orthogonal methods","pmids":["38316778"],"is_preprint":false},{"year":2025,"finding":"MAZ binds to the FTH1 promoter (confirmed by ChIP assay) to directly regulate FTH1 transcription. Long non-coding RNA TUG1 binds MAZ (confirmed by luciferase assay) and acts as a negative regulator of MAZ; downregulation of TUG1 upregulates MAZ, increasing FTH1 expression and attenuating ferroptosis in glioma cells treated with dihydroartemisinin.","method":"ChIP assay, dual-luciferase reporter assay, siRNA knockdown, ferroptosis assay","journal":"Oxidative medicine and cellular longevity","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and reporter assay with functional knockdown, single lab","pmids":["36164395"],"is_preprint":false},{"year":2025,"finding":"MAZ binds to the MAZ promoter and interacts with HDAC1, RBBP7, and CUL4B as a transcriptional inhibitory complex. MAZ and HDAC1 cooperatively repress CSK gene expression; knockdown of either MAZ or HDAC1 activates CSK expression, subsequently inhibiting MAPK/ERK, STAT3, and PI3K/AKT signaling. MAZ recruits HDAC1 to catalyze histone deacetylation at the CSK promoter.","method":"Immunoaffinity purification with mass spectrometry, RNA-seq, ChIP assay, Co-IP, in vivo xenograft model","journal":"Molecular carcinogenesis","confidence":"High","confidence_rationale":"Tier 1-2 — immunoaffinity purification/MS to identify complex, ChIP, and rescue experiments; multiple orthogonal methods","pmids":["40618395"],"is_preprint":false},{"year":2026,"finding":"Zip7 (a zinc transporter) mainly interacts with MAZ in the cytoplasm to facilitate MAZ nuclear import; nuclear MAZ is upregulated in metastatic prostate cancer and promotes MYBL2 transcription, driving prostate cancer bone metastasis.","method":"Co-immunoprecipitation, subcellular fractionation, RNA-seq, ChIP, in vivo intrarterial bone metastasis xenograft model","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and fractionation with functional in vivo model, single lab","pmids":["42010154"],"is_preprint":false}],"current_model":"MAZ is a multi-functional Cys2His2 zinc finger transcription factor that binds GA-box/GC-rich sequences (consensus GGGAGGG) and G-quadruplex structures at gene promoters to both activate and repress transcription initiation; it terminates transcription at closely spaced gene boundaries by bending DNA; it pauses elongating RNA polymerase II to influence co-transcriptional alternative splicing; it interacts with cohesin (via RAD21) and colocalizes with CTCF at chromatin insulator boundaries to organize topologically associating domains; its DNA-binding activity is regulated by CKII-mediated phosphorylation at Ser480 and by Akt-mediated phosphorylation at Thr385; it forms phase-separated nuclear condensates via its zinc finger domains (ZF3-5) that are mobilized by G-quadruplex binding (ZF2) to compartmentalize coactivators and activate target genes; and it recruits repressive complexes including HDAC1 to silence specific loci."},"narrative":{"teleology":[{"year":1992,"claim":"The identity of the factor binding GA-box elements in the c-MYC promoter was unknown; cloning of MAZ revealed a six-zinc-finger protein recognizing GGGAGGG motifs at both initiation and termination elements, establishing that a single factor could participate in both processes.","evidence":"cDNA cloning from HeLa library with in vitro DNA-binding and mutational analysis","pmids":["1502157"],"confidence":"High","gaps":["No in vivo demonstration of termination function","Mechanism of termination versus initiation distinction unclear"]},{"year":1992,"claim":"Whether MAZ could function as a bona fide transcriptional activator at endogenous promoters beyond c-MYC was unresolved; demonstration that Pur-1/MAZ activates the insulin promoter via GAGA boxes in nonpancreatic cells established it as a general transcriptional activator of purine-rich elements.","evidence":"cDNA cloning from insulinoma library, transient transfection/transactivation in HeLa and beta-cell lines","pmids":["1454839"],"confidence":"High","gaps":["No chromatin context demonstrated","No loss-of-function for insulin expression"]},{"year":1994,"claim":"How transcription terminates between closely spaced genes was mechanistically opaque; showing that MAZ binding sites are required for termination between complement genes C2/Factor B, and that MAZ bends DNA, provided a physical model for termination at gene boundaries.","evidence":"In vitro binding, DNA bending assay, in vivo termination assay with site mutations","pmids":["7988563"],"confidence":"High","gaps":["No structural data on MAZ-induced DNA bend","Mechanism linking bending to polymerase release not established"]},{"year":1996,"claim":"Whether MAZ and Sp1 share or compete for regulatory elements was unclear; footprinting of the serotonin 1a receptor and later the PNMT promoter revealed overlapping MAZ/Sp1 binding sites, establishing competitive co-occupancy as a regulatory mechanism at GC-rich promoters.","evidence":"DNase I footprinting, EMSA competition, reporter assays across multiple promoters","pmids":["8626793","14573768"],"confidence":"High","gaps":["Genome-wide extent of MAZ/Sp1 competition unknown at this stage","Whether competition is cell-type-specific not addressed"]},{"year":1997,"claim":"MAZ had been characterized only as an activator; demonstrating GAL4-fusion-mediated repression mapped to the N-terminal proline/alanine-rich domain established MAZ as a bifunctional transcription factor capable of both activation and repression.","evidence":"GAL4 fusion repressor assay, deletion mapping, reporter assay in COS cells","pmids":["10383467"],"confidence":"High","gaps":["Cofactors mediating repression not identified at this stage","No in vivo repression data"]},{"year":1999,"claim":"Post-translational regulation of MAZ DNA-binding activity was unknown; identification of CKII-mediated phosphorylation at Ser480 as required for maximum DNA binding and transactivation established phosphorylation as a key regulatory switch.","evidence":"In vitro kinase assay, Ser480Ala mutagenesis, EMSA, luciferase reporter","pmids":["10448092"],"confidence":"High","gaps":["In vivo phosphorylation dynamics not characterized","Other kinase inputs not explored"]},{"year":2004,"claim":"Whether MAZ could affect post-transcriptional gene regulation was unknown; showing that MAZ elements pause elongating RNA polymerase II within FGFR2 and thereby influence co-transcriptional alternative splicing linked MAZ to RNA processing.","evidence":"Minigene reporter, RT-PCR elongation assay, in vitro transcription","pmids":["15126509"],"confidence":"High","gaps":["Direct protein requirement (versus DNA element requirement) not fully separated","Genome-wide scope of MAZ-dependent splicing unknown"]},{"year":2013,"claim":"The relationship between MAZ and non-canonical DNA structures was unexplored; demonstrating that MAZ binds and activates transcription through G-quadruplex structures in the KRAS promoter, and that G4-decoy oligonucleotides block this, established G-quadruplex recognition as a functional mode of MAZ action.","evidence":"G4 competitive binding assay, reporter assay, xenograft mouse model","pmids":["23471001"],"confidence":"High","gaps":["Structural basis of MAZ–G4 interaction unresolved","Whether G4 binding is separable from duplex binding not determined"]},{"year":2014,"claim":"Whether MAZ simply bound or actively remodeled G-quadruplexes was unknown; reconstitution showing MAZ unfolds HRAS promoter G-quadruplexes and promotes duplex formation established MAZ as a G4-resolving factor that activates transcription by unwinding inhibitory structures.","evidence":"In vitro G-quadruplex unfolding assay with MAZ-GST, mutagenesis, reporter assay","pmids":["25013182"],"confidence":"High","gaps":["Energy source for unfolding not identified","In vivo G4 resolution not demonstrated"]},{"year":2016,"claim":"A second kinase input to MAZ was undefined; showing that Akt phosphorylates MAZ at Thr385 to release it from the p53 promoter, thereby derepressing p53, revealed a phosphorylation-dependent toggle between MAZ occupancy and gene activation.","evidence":"In vitro kinase assay, ChIP, site-directed mutagenesis, reporter assay","pmids":["26902421"],"confidence":"Medium","gaps":["Single lab finding","Interplay between CKII (Ser480) and Akt (Thr385) phosphorylation not examined"]},{"year":2018,"claim":"The in vivo developmental requirement for MAZ was unknown; CRISPR knockout of Maz in mice caused perinatal lethality with kidney and urinary tract anomalies (CAKUT) and haploinsufficiency for bladder development, while knockdown in human cells disrupted S-phase entry and Wnt morphogen expression.","evidence":"CRISPR-Cas9 mouse model, siRNA knockdown with transcriptome analysis, cell cycle assay","pmids":["29432158"],"confidence":"High","gaps":["Direct transcriptional targets mediating CAKUT not delineated","Human genetic CAKUT association not established"]},{"year":2021,"claim":"Whether MAZ functioned in higher-order chromatin organization was entirely open; demonstrating that MAZ physically interacts with cohesin, independently arrests cohesin sliding, pauses RNA polymerase II, and insulates enhancer–promoter communication established MAZ as a chromatin architectural protein analogous to CTCF.","evidence":"Co-IP, Hi-C, insulator reporter assay, siRNA depletion, RNAPII pausing assay","pmids":["33558242"],"confidence":"High","gaps":["Structural basis of cohesin arrest unknown","Whether MAZ and CTCF act redundantly or synergistically at all shared sites unclear"]},{"year":2022,"claim":"The functional consequence of MAZ at CTCF boundaries in developmental gene regulation was untested; a genome-wide CRISPR screen and MAZ motif deletions at Hox clusters showed that MAZ cooperates with CTCF to insulate posterior Hox genes, with loss causing homeotic transformations in mice.","evidence":"CRISPR KO screen, MAZ motif deletions, Hi-C, biochemical Co-IP with RAD21, mouse phenotyping","pmids":["35145304"],"confidence":"High","gaps":["Whether MAZ insulation extends beyond Hox clusters genome-wide not fully mapped","Mechanism distinguishing MAZ-dependent from CTCF-only boundaries undefined"]},{"year":2024,"claim":"How MAZ concentrates transcriptional machinery at target promoters was mechanistically unexplained; showing that MAZ forms phase-separated condensates via ZF3-5, that G-quadruplex binding by ZF2 mobilizes MAZ into these condensates to colocalize with BRD4/MED1/CDK9, and that both activities are required for target gene activation, unified G4 recognition with phase separation as a transcriptional activation mechanism.","evidence":"Zinc finger mutagenesis, in vitro phase separation, immunofluorescence colocalization, xenograft model","pmids":["38316778"],"confidence":"High","gaps":["In vivo dynamics of MAZ condensates not resolved","Whether phase separation contributes to insulator or repressor functions not tested"]},{"year":2025,"claim":"The cofactor basis for MAZ-mediated transcriptional repression was largely uncharacterized; immunoaffinity purification identified an MAZ–HDAC1–RBBP7–CUL4B complex that cooperatively silences CSK by catalyzing histone deacetylation at its promoter, providing a mechanistic basis for MAZ repressor function.","evidence":"Immunoaffinity purification/mass spectrometry, ChIP, Co-IP, RNA-seq, xenograft model","pmids":["40618395"],"confidence":"High","gaps":["Whether HDAC1 recruitment is general to all MAZ-repressed targets unknown","Structural basis of MAZ–HDAC1 interaction not determined"]},{"year":null,"claim":"Key unresolved questions include the structural basis of MAZ–cohesin interaction and cohesin arrest, the genome-wide rules distinguishing MAZ-activated from MAZ-repressed targets, whether MAZ phase separation contributes to its insulator and repressor functions, and whether human MAZ mutations cause developmental syndromes analogous to mouse CAKUT/Hox phenotypes.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure of MAZ bound to DNA or cohesin","No human Mendelian disease formally attributed to MAZ variants in the literature","Interplay between CKII and Akt phosphorylation in regulating MAZ chromatin occupancy not investigated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,1,2,3,7,11,13,15,17,18,21,28,29,30,31]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,3,5,7,15,17,21,28,30,31,32]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[14,27]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[27,29]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,5,11,21,27,28,29,30,32,33]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[27,30]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[27,29]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,2,3,5,7,15,17,21,28,30,31,32]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[27,29,32]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[23,26,29]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[22,23,26]}],"complexes":["MAZ–HDAC1–RBBP7–CUL4B repressive complex"],"partners":["RAD21","CTCF","HDAC1","RBBP7","CUL4B","EWSR1","SP1","SLC39A7"],"other_free_text":[]},"mechanistic_narrative":"MAZ is a Cys2His2 zinc finger transcription factor that binds GA-box (GGGAGGG), GC-rich, and G-quadruplex DNA elements to regulate transcription initiation, termination, RNA polymerase II pausing, and three-dimensional chromatin organization. It activates diverse promoters — including c-MYC, insulin, KRAS, HRAS, MYB, and muscle-specific genes — by recognizing G-rich sequences and G-quadruplex structures (via zinc finger 2), and can form phase-separated nuclear condensates (via zinc fingers 3–5) that compartmentalize coactivators such as BRD4, MED1, and CDK9 to drive transcription [PMID:1502157, PMID:1454839, PMID:23471001, PMID:25013182, PMID:38316778]. MAZ also functions as a transcriptional repressor through its N-terminal proline/alanine-rich domain, recruits HDAC1 to silence targets such as CSK, autorepresses its own promoter, and represses p53 transcription in an Akt-phosphorylation-dependent manner [PMID:10383467, PMID:26902421, PMID:40618395]. At a higher-order level, MAZ physically interacts with the cohesin subunit RAD21, independently arrests cohesin sliding, colocalizes with CTCF at topologically associating domain boundaries, and pauses elongating RNA polymerase II to influence co-transcriptional alternative splicing and chromatin insulation, with loss of MAZ causing homeotic transformations at Hox clusters and congenital kidney/urinary tract anomalies in mice [PMID:33558242, PMID:35145304, PMID:29432158]. Its DNA-binding activity is positively regulated by casein kinase II phosphorylation at Ser480 and negatively regulated by Akt phosphorylation at Thr385 [PMID:10448092, PMID:26902421]."},"prefetch_data":{"uniprot":{"accession":"P56270","full_name":"Myc-associated zinc finger protein","aliases":["Pur-1","Purine-binding transcription factor","Serum amyloid A-activating factor-1","SAF-1","Transcription factor Zif87","ZF87","Zinc finger protein 801"],"length_aa":477,"mass_kda":48.6,"function":"Transcriptional regulator, potentially with dual roles in transcription initiation and termination Binds DNA and functions as a transcriptional activator (PubMed:12270922). Binds to two G/A-rich sites, ME1a1 and ME1a2, within the MYC promoter having greater affinity for the former (PubMed:1502157). Also binds to multiple G/C-rich sites within the promoter of the Sp1 family of transcription factors (PubMed:1502157) Binds DNA and functions as a transcriptional activator (PubMed:12270922). Inhibits MAZ isoform 1-mediated transcription (PubMed:12270922) Binds DNA and functions as a transcriptional activator","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P56270/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MAZ","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/MAZ","total_profiled":1310},"omim":[{"mim_id":"614215","title":"ACTIVATING SIGNAL COINTEGRATOR 1 COMPLEX, SUBUNIT 1; ASCC1","url":"https://www.omim.org/entry/614215"},{"mim_id":"606747","title":"VASCULAR ENDOTHELIAL ZINC FINGER 1; VEZF1","url":"https://www.omim.org/entry/606747"},{"mim_id":"606465","title":"KLF TRANSCRIPTION FACTOR 15; KLF15","url":"https://www.omim.org/entry/606465"},{"mim_id":"605779","title":"NAIL DISORDER, NONSYNDROMIC CONGENITAL, 7; NDNC7","url":"https://www.omim.org/entry/605779"},{"mim_id":"605165","title":"ZINC FINGER PROTEIN 278; ZNF278","url":"https://www.omim.org/entry/605165"}],"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/MAZ"},"hgnc":{"alias_symbol":["ZF87","Pur-1","Zif87","ZNF801"],"prev_symbol":[]},"alphafold":{"accession":"P56270","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P56270","model_url":"https://alphafold.ebi.ac.uk/files/AF-P56270-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P56270-F1-predicted_aligned_error_v6.png","plddt_mean":58.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MAZ","jax_strain_url":"https://www.jax.org/strain/search?query=MAZ"},"sequence":{"accession":"P56270","fasta_url":"https://rest.uniprot.org/uniprotkb/P56270.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P56270/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P56270"}},"corpus_meta":[{"pmid":"1502157","id":"PMC_1502157","title":"MAZ, a zinc finger protein, binds to c-MYC and C2 gene sequences regulating transcriptional initiation and 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It binds specifically to the GA box sequence (GGGAGGG) found in the c-MYC P2 promoter, to the P2 attenuator region in the first exon, and to a related sequence involved in transcriptional termination of the C2 gene, suggesting dual roles in transcription initiation and termination.\",\n      \"method\": \"cDNA cloning from HeLa lambda gt11 library, in vitro DNA-binding assay with fusion protein, mutational analysis of binding sites\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original cloning with in vitro binding reconstitution and mutational validation; foundational paper\",\n      \"pmids\": [\"1502157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Pur-1 (MAZ) binds specifically to purine-rich GAGA boxes in the insulin gene promoter and acts as a potent transcriptional activator in both pancreatic and nonpancreatic cells, activating an intact insulin promoter in HeLa cells where it is normally inactive.\",\n      \"method\": \"cDNA cloning from insulinoma library, DNA-binding assay, transient transfection/transactivation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro binding plus functional transactivation assay in multiple cell types; foundational paper\",\n      \"pmids\": [\"1454839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"MAZ binds to a consensus sequence G5AG5 in transcriptional termination regions between closely spaced human complement genes C2 and Factor B; mutation of MAZ binding sites severely reduces termination activity, and MAZ induces DNA bending, which is proposed to be important for termination function.\",\n      \"method\": \"In vitro protein-DNA binding, in vivo termination assay, mutational analysis of MAZ binding sites, DNA bending assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro binding reconstitution, mutagenesis, and in vivo functional termination assay with multiple orthogonal methods\",\n      \"pmids\": [\"7988563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"MAZ binds to four GC-rich sites in the serotonin 1a receptor gene promoter (identified by DNase I footprinting), three of which overlap Sp1 binding sites, and overproduction of MAZ in transient transfection substantially increases expression from the human serotonin 1a receptor promoter. One GC-rich sequence was also shown to function as a transcription initiator in vitro.\",\n      \"method\": \"cDNA cloning, DNase I footprinting, transient transfection/reporter assay, in vitro transcription initiation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — DNase I footprinting, in vitro transcription, and transactivation assays with multiple orthogonal methods\",\n      \"pmids\": [\"8626793\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"THZif-1 (a MAZ-like zinc finger protein) binds specifically to the single-stranded pyrimidine-rich DNA of the c-MYC nuclease-hypersensitive element (NHE) with Kd ~0.077 µM; binding is enhanced by methylated cytosine on single-stranded DNA and is mediated primarily by the amino-terminal second zinc finger motif. It does not bind the purine-rich strand.\",\n      \"method\": \"EMSA with GST-fusion proteins, deletion mutant analysis, methylation analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro binding with mutagenesis, single lab\",\n      \"pmids\": [\"8940139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Overexpression of ZF87/MAZ in COS cells significantly represses transcription from the murine c-myc P2 promoter through the ME1a2 element at -86 relative to the P2 start site. MAZ functions as a true transcriptional repressor independently of the c-myc promoter context (shown via GAL4 fusion), with the repressive domain mapping to the N-terminal proline/alanine-rich region.\",\n      \"method\": \"Transient transfection/reporter assay, GAL4 fusion repressor assay, deletion mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal reporter assays with domain mapping and GAL4 fusion system\",\n      \"pmids\": [\"10383467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"MAZ is essential for ME1a1-mediated expression of c-myc during retinoic acid-induced neuroectodermal differentiation of P19 cells; MAZ DNA-binding activity kinetics closely correlated with changes in c-myc promoter activity during differentiation, and a construct lacking the ME1a1 site failed to show the MAZ-dependent transient increase.\",\n      \"method\": \"Reporter gene assay in P19 cells, EMSA with ME1a1 probe\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reporter assay plus EMSA correlating binding activity with promoter activity during differentiation\",\n      \"pmids\": [\"9294605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"MAZ and Sp1 both activate expression from the adenovirus type 5 major late promoter by binding to GC-rich sequences flanking the TATA box (MAZ at -18 and -36; Sp1 at -18) and distal sites. Both transcription factors interact with adenovirus E1A protein as demonstrated by immunoprecipitation, and E1A enhances their activation.\",\n      \"method\": \"DNase I footprinting, transient transfection/reporter assay, mutational analysis, immunoprecipitation\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — footprinting, mutagenesis, reporter assay, and Co-IP; multiple orthogonal methods\",\n      \"pmids\": [\"9371624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"MAZ is phosphorylated by casein kinase II (CKII) at serine 480 (the major site), and this phosphorylation is required for maximum DNA binding of MAZ to the pyrimidine-rich NHE of the c-myc promoter. Mutation of Ser480 to alanine eliminates DNA-binding activity and abolishes MAZ-mediated enhancement of c-myc promoter-driven luciferase expression in the presence of CKII.\",\n      \"method\": \"Site-specific mutagenesis, in vitro phosphorylation assay, EMSA, luciferase reporter assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro phosphorylation with site-directed mutagenesis plus functional reporter assay\",\n      \"pmids\": [\"10448092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"FAC1 protein interacts with ZF87/MAZ, as identified by yeast two-hybrid and confirmed in vitro with recombinant proteins. The FAC1-MAZ interaction domain maps to the NLS/NES region of FAC1, while FAC1 recognizes a conformational interface including the proline/alanine-rich domain and first zinc finger of MAZ. Co-expression of FAC1 reduces ZF87/MAZ-induced transcriptional activation of an SV40 promoter in a dose-dependent manner.\",\n      \"method\": \"Yeast two-hybrid, recombinant protein pulldown, transient co-transfection/reporter assay, deletion mapping\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — yeast two-hybrid confirmed by in vitro pulldown, with functional reporter assay\",\n      \"pmids\": [\"10727212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"G-quartet structures formed by the insulin-linked polymorphic region (ILPR) in the insulin gene promoter influence Pur-1/MAZ-dependent transcriptional activity; inter- and intramolecular G-quartet formation correlates with changes in insulin transcription activity associated with IDDM2 diabetes susceptibility.\",\n      \"method\": \"G-quartet formation assay, transient transfection/reporter assay with mutant ILPR sequences\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional reporter assay with designed ILPR mutants and G-quartet structural analysis\",\n      \"pmids\": [\"11070077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"MAZ and Sp1 both interact with the same GC-rich cis-elements in the human MAZ gene promoter. The DNA-binding activities of Sp1 and MAZ depend mainly on consecutive zinc fingers: third and fourth zinc fingers of MAZ (zinc fingers 2 and 3 of Sp1). MAZ autorepresses its own promoter, with histone deacetylases involved in MAZ autorepression, while Sp1-mediated repression involves DNA methyltransferase 1.\",\n      \"method\": \"EMSA, deletion and mutational analysis, transient transfection/reporter assay, zinc finger domain mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including domain mapping, binding assays, and mechanistic reporter experiments\",\n      \"pmids\": [\"11259406\", \"11395515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"SP1 and MAZ bind to a 27 bp GC-rich region in the NR1 (NMDA receptor subunit 1) gene promoter; mutations in the SP1 and MAZ binding sites impair binding of both proteins and decrease NR1 promoter activity during neuronal differentiation of P19 cells, indicating both factors mediate enhancement of NR1 promoter activity.\",\n      \"method\": \"EMSA, mutational analysis, transient transfection/reporter assay\",\n      \"journal\": \"Brain research. Molecular brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — binding assay with mutagenesis and functional reporter assay\",\n      \"pmids\": [\"12425938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"MAZ and Sp1 competitively bind to overlapping sequences at -48 and -38 bp in the rat PNMT gene promoter; MAZ displaces Sp1 binding in a concentration-dependent manner, and their binding is mutually exclusive. Phosphorylation of both factors (shown by phosphatase treatment) is required for DNA binding. Despite higher affinity, MAZ is a less effective activator than Sp1, and MAZ preferentially increases intron-retaining mRNA.\",\n      \"method\": \"Gel mobility shift assay (EMSA) with in vitro translated proteins and nuclear extracts, phosphatase treatment, transient transfection/reporter assay, mutational analysis\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstituted binding competition with phosphorylation dependence, multiple orthogonal assays\",\n      \"pmids\": [\"14573768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"MAZ elements in the FGFR2 gene act as RNA polymerase II pause sites; insertion of a MAZ4 element at positions 5' of upstream silencing elements or between exon IIIb and downstream silencing elements decreases silencing of exon IIIb, while insertion 3' of downstream silencing elements has no effect. An RT-PCR elongation assay confirmed MAZ4 is a RNAPII pause site, and promoter identity alters the MAZ4 effect, linking MAZ-dependent RNAPII pausing to co-transcriptional alternative splicing decisions.\",\n      \"method\": \"Minigene transfection reporter assay, RT-PCR elongation assay, in vitro transcribed RNA transfection\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple complementary approaches establishing RNAPII pausing and its functional consequence on splicing\",\n      \"pmids\": [\"15126509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"MAZ binds the muscle creatine kinase (MCK) promoter element MPEX in vitro and in vivo (ChIP), transactivates the MCK promoter, and occupies promoters of multiple muscle genes (Skeletal alpha-actin, Desmin, alpha-Myosin heavy chain, Six4) in skeletal and cardiac myocytes. MAZ DNA-binding activity and transcript levels are upregulated during skeletal myocyte differentiation. MAZ also binds sequences diverging from its canonical GA box (e.g., CTCCTCCC) in muscle promoters.\",\n      \"method\": \"ICAT-based quantitative proteomics, in vitro DNA binding, chromatin immunoprecipitation (ChIP), transient transfection/reporter assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — quantitative proteomics identification, in vitro binding, ChIP at endogenous loci, and transactivation assays\",\n      \"pmids\": [\"18710939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"miR-125b targets MAZ mRNA and is downregulated in glioblastoma-associated endothelial cells and upon VEGF exposure, resulting in increased MAZ expression. MAZ in turn transcriptionally activates VEGF, creating a feed-forward loop. Inhibition of MAZ accumulation by miR-125b or MAZ-specific shRNAs attenuates primary human brain endothelial cell migration and tubule formation in vitro.\",\n      \"method\": \"shRNA knockdown, miRNA overexpression, migration assay, tubule formation assay, transcriptional reporter assay\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — shRNA knockdown with defined cellular phenotype and miRNA targeting, single lab\",\n      \"pmids\": [\"22415301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MAZ activates KRAS transcription by binding to G-quadruplex structures in the KRAS promoter nuclease-hypersensitive element (NHE). G4-decoy oligonucleotides mimicking the NHE G-quadruplex competitively inhibit MAZ binding, suppress KRAS expression in pancreatic cancer cells, inhibit proliferation and colony formation, activate apoptosis, and reduce tumor xenograft growth by 64% in mice.\",\n      \"method\": \"Transcriptional reporter assay, G-quadruplex competitive binding assay, cell viability assay, xenograft mouse model\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — functional reporter assay, in vitro and in vivo experiments with mechanistic G4-decoy competition\",\n      \"pmids\": [\"23471001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MAZ binds to two neighboring G-quadruplex structures in the HRAS promoter and unfolds them; in the presence of complementary strands, MAZ-GST promotes rapid transformation of HRAS quadruplexes into duplexes. Mutational dissection shows that the two neighboring G-quadruplexes synergistically repress HRAS transcription, and MAZ binding (unfolding) activates HRAS expression.\",\n      \"method\": \"In vitro G-quadruplex binding and unfolding assay with MAZ-GST fusion, mutational analysis of G-elements, transcriptional reporter assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro G-quadruplex unfolding with mutagenesis and functional reporter assay\",\n      \"pmids\": [\"25013182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MAZ protein is essential for HIF2α-mediated activation of the Cav1 (caveolin-1) promoter in intestinal epithelial cells; HIF2α activates the Cav1 promoter in a HIF response element-independent manner, and MAZ is required for this activation. Hypoxic induction of CAV1 via HIF2α/MAZ suppresses occludin expression, disrupting intestinal barrier integrity and contributing to hypoxia-induced inflammation.\",\n      \"method\": \"Mouse models with intestine-specific HIF1α/HIF2α overexpression, promoter/reporter assay, siRNA knockdown\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo mouse model plus reporter assay, single lab\",\n      \"pmids\": [\"24891620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Akt phosphorylates MAZ at Thr385, and this phosphorylation releases MAZ from the p53 promoter, leading to transcriptional activation of p53. MAZ functions as a transcriptional repressor of the p53 promoter.\",\n      \"method\": \"In vitro kinase assay, ChIP assay, reporter gene assay, site-directed mutagenesis\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — kinase assay with mutagenesis and ChIP, but single lab\",\n      \"pmids\": [\"26902421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MAZ purified from nuclear extracts (as the Myb-sp factor) directly binds the E2F element in the MYB promoter and activates transcription through it. Various MAZ isoforms are present in Myb-sp and activate MYB transcription. Co-expression of MAZ not only reverts RB/p130-mediated repression via the E2F element but activates transcription, and MAZ knockdown inhibits MYB expression during exit from quiescence.\",\n      \"method\": \"Protein purification, EMSA, luciferase reporter assay, ChIP, siRNA knockdown\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — biochemical purification, binding assay, ChIP, and reporter assay with knockdown; multiple orthogonal methods\",\n      \"pmids\": [\"28973440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MAZ promotes pancreatic cancer cell invasiveness by increasing CRAF-ERK signaling (not by directly affecting K-Ras expression); this activation is mediated via PAK and AKT/PKB signaling cascades. The oncoprotein Cyr61/CCN1 regulates MAZ expression via Notch-1-sonic hedgehog signaling.\",\n      \"method\": \"siRNA knockdown, invasion/migration assay, western blot, western blot of signaling components\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined signaling phenotype, single lab\",\n      \"pmids\": [\"29414775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MAZ knockdown in HEK293 cells results in differential expression of WNT morphogens Wnt11 and Wnt4, prevents efficient S phase transition, and abrogates growth of human embryonic kidney cells. In mice, homozygous CRISPR-Cas9 Maz deletion results in perinatal lethality with high penetrance of congenital anomalies of the kidney and urinary tract (CAKUTs), and Maz is haploinsufficient for normal bladder development.\",\n      \"method\": \"siRNA knockdown with transcriptome analysis, CRISPR-Cas9 mouse model, cell cycle assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo CRISPR mouse model with specific developmental phenotype plus mechanistic cell biology in human cells\",\n      \"pmids\": [\"29432158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"circ-CUX1 binds to EWSR1 to facilitate EWSR1 interaction with MAZ, resulting in transactivation of MAZ and transcriptional alteration of CUX1 and other genes associated with neuroblastoma progression. This circ-CUX1/EWSR1/MAZ axis promotes aerobic glycolysis in neuroblastoma.\",\n      \"method\": \"RNA pulldown, co-immunoprecipitation, luciferase reporter assay, inhibitory peptide and lentiviral knockdown\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and reporter assay with functional rescue, single lab\",\n      \"pmids\": [\"31709724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MAZ promotes bone metastasis of prostate cancer through transcriptional upregulation of KRas (and HRas) expression, with RalGEF signaling selectively mediating the pro-metastatic effect of KRas. ChIP and luciferase assays demonstrated MAZ binding to and activation of KRAS promoter.\",\n      \"method\": \"ChIP assay, luciferase reporter assay, transwell invasion assay, mouse intracardiac bone metastasis model\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and reporter plus in vivo model, single lab\",\n      \"pmids\": [\"31488180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Disruption of Maz in mice produces developmental eye defects, with significant upregulation of Wnt2b, Sfrp2, and Fzd4 in Maz-deficient eyes, along with downregulation of the Wnt reporter TCF-Lef1, indicating MAZ is required for activation of the Wnt/β-catenin pathway and ciliary margin patterning.\",\n      \"method\": \"Conditional mouse Maz knockout, gene expression analysis, Wnt reporter assay\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo mouse KO with defined pathway phenotype, single lab\",\n      \"pmids\": [\"32571845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MAZ, like CTCF, physically interacts with the cohesin subunit (Co-IP demonstrated) and can independently arrest cohesin sliding. MAZ also independently pauses the elongating form of RNA polymerase II and consequently affects RNA alternative splicing. CTCF/MAZ double sites are more effective at sequestering cohesin than CTCF-only sites. MAZ depletion disrupts local interactions within TADs and TAD boundaries, and MAZ binding between an enhancer and promoter results in down-regulation of reporter gene expression, supporting a role as an insulator protein.\",\n      \"method\": \"Co-immunoprecipitation, Hi-C, insulator reporter assay, siRNA depletion, RNAPII pausing assay, alternative splicing analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — Co-IP, Hi-C, insulator reporter, and RNAPII pausing; multiple orthogonal methods\",\n      \"pmids\": [\"33558242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MAZ identified by DNA affinity purification/mass spectrometry as binding to the alpha-globin gene promoter in primary human erythroid cells. Genome-wide ChIP-seq showed MAZ occupies active promoters and GATA1-bound enhancers of key erythroid genes. MAZ knockdown reduces alpha-globin expression in K562 cells and impairs differentiation in primary human erythroid cells.\",\n      \"method\": \"DNA affinity purification, mass spectrometry, ChIP-seq, siRNA knockdown, erythroid differentiation assay\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — biochemical affinity purification, genome-wide ChIP, and functional knockdown with defined erythroid phenotype\",\n      \"pmids\": [\"34351390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MAZ colocalizes with CTCF at chromatin borders and interacts with the cohesin subunit RAD21 (biochemical assay). CRISPR KO screen and MAZ motif deletions lead to derepression of posterior Hox genes immediately after CTCF boundaries upon differentiation, causing homeotic transformations in mice, establishing MAZ as a cofactor in CTCF-mediated genomic insulation at Hox clusters.\",\n      \"method\": \"Genome-wide CRISPR knockout screen, biochemical Co-IP, MAZ motif deletion, Hi-C, CRISPR mouse model\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — genome-wide CRISPR screen with biochemical Co-IP, in vivo mouse phenotype, and multiple orthogonal methods\",\n      \"pmids\": [\"35145304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"G-quadruplexes in the CCND1 promoter recruit MAZ and propel motility in MAZ phase-separated condensates, activating CCND1 transcription. Zinc finger 2 of MAZ is responsible for G4 binding; ZF3-5 are critical for MAZ condensation. MAZ nuclear puncta overlap G4 signals and coactivators BRD4, MED1, CDK9, and active RNA polymerase II. MAZ mutants lacking either G4 binding or phase separation ability cannot form nuclear puncta and fail to promote hepatocellular carcinoma cell proliferation.\",\n      \"method\": \"Mutagenesis of MAZ zinc fingers, phase separation assay, co-localization (immunofluorescence), G4 binding assay, xenograft tumor model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structure-function mutagenesis, reconstituted phase separation, and in vivo xenograft validation; multiple orthogonal methods\",\n      \"pmids\": [\"38316778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MAZ binds to the FTH1 promoter (confirmed by ChIP assay) to directly regulate FTH1 transcription. Long non-coding RNA TUG1 binds MAZ (confirmed by luciferase assay) and acts as a negative regulator of MAZ; downregulation of TUG1 upregulates MAZ, increasing FTH1 expression and attenuating ferroptosis in glioma cells treated with dihydroartemisinin.\",\n      \"method\": \"ChIP assay, dual-luciferase reporter assay, siRNA knockdown, ferroptosis assay\",\n      \"journal\": \"Oxidative medicine and cellular longevity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and reporter assay with functional knockdown, single lab\",\n      \"pmids\": [\"36164395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MAZ binds to the MAZ promoter and interacts with HDAC1, RBBP7, and CUL4B as a transcriptional inhibitory complex. MAZ and HDAC1 cooperatively repress CSK gene expression; knockdown of either MAZ or HDAC1 activates CSK expression, subsequently inhibiting MAPK/ERK, STAT3, and PI3K/AKT signaling. MAZ recruits HDAC1 to catalyze histone deacetylation at the CSK promoter.\",\n      \"method\": \"Immunoaffinity purification with mass spectrometry, RNA-seq, ChIP assay, Co-IP, in vivo xenograft model\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — immunoaffinity purification/MS to identify complex, ChIP, and rescue experiments; multiple orthogonal methods\",\n      \"pmids\": [\"40618395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Zip7 (a zinc transporter) mainly interacts with MAZ in the cytoplasm to facilitate MAZ nuclear import; nuclear MAZ is upregulated in metastatic prostate cancer and promotes MYBL2 transcription, driving prostate cancer bone metastasis.\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation, RNA-seq, ChIP, in vivo intrarterial bone metastasis xenograft model\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and fractionation with functional in vivo model, single lab\",\n      \"pmids\": [\"42010154\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MAZ is a multi-functional Cys2His2 zinc finger transcription factor that binds GA-box/GC-rich sequences (consensus GGGAGGG) and G-quadruplex structures at gene promoters to both activate and repress transcription initiation; it terminates transcription at closely spaced gene boundaries by bending DNA; it pauses elongating RNA polymerase II to influence co-transcriptional alternative splicing; it interacts with cohesin (via RAD21) and colocalizes with CTCF at chromatin insulator boundaries to organize topologically associating domains; its DNA-binding activity is regulated by CKII-mediated phosphorylation at Ser480 and by Akt-mediated phosphorylation at Thr385; it forms phase-separated nuclear condensates via its zinc finger domains (ZF3-5) that are mobilized by G-quadruplex binding (ZF2) to compartmentalize coactivators and activate target genes; and it recruits repressive complexes including HDAC1 to silence specific loci.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"MAZ is a Cys2His2 zinc finger transcription factor that binds GA-box (GGGAGGG), GC-rich, and G-quadruplex DNA elements to regulate transcription initiation, termination, RNA polymerase II pausing, and three-dimensional chromatin organization. It activates diverse promoters — including c-MYC, insulin, KRAS, HRAS, MYB, and muscle-specific genes — by recognizing G-rich sequences and G-quadruplex structures (via zinc finger 2), and can form phase-separated nuclear condensates (via zinc fingers 3–5) that compartmentalize coactivators such as BRD4, MED1, and CDK9 to drive transcription [PMID:1502157, PMID:1454839, PMID:23471001, PMID:25013182, PMID:38316778]. MAZ also functions as a transcriptional repressor through its N-terminal proline/alanine-rich domain, recruits HDAC1 to silence targets such as CSK, autorepresses its own promoter, and represses p53 transcription in an Akt-phosphorylation-dependent manner [PMID:10383467, PMID:26902421, PMID:40618395]. At a higher-order level, MAZ physically interacts with the cohesin subunit RAD21, independently arrests cohesin sliding, colocalizes with CTCF at topologically associating domain boundaries, and pauses elongating RNA polymerase II to influence co-transcriptional alternative splicing and chromatin insulation, with loss of MAZ causing homeotic transformations at Hox clusters and congenital kidney/urinary tract anomalies in mice [PMID:33558242, PMID:35145304, PMID:29432158]. Its DNA-binding activity is positively regulated by casein kinase II phosphorylation at Ser480 and negatively regulated by Akt phosphorylation at Thr385 [PMID:10448092, PMID:26902421].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"The identity of the factor binding GA-box elements in the c-MYC promoter was unknown; cloning of MAZ revealed a six-zinc-finger protein recognizing GGGAGGG motifs at both initiation and termination elements, establishing that a single factor could participate in both processes.\",\n      \"evidence\": \"cDNA cloning from HeLa library with in vitro DNA-binding and mutational analysis\",\n      \"pmids\": [\"1502157\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No in vivo demonstration of termination function\", \"Mechanism of termination versus initiation distinction unclear\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Whether MAZ could function as a bona fide transcriptional activator at endogenous promoters beyond c-MYC was unresolved; demonstration that Pur-1/MAZ activates the insulin promoter via GAGA boxes in nonpancreatic cells established it as a general transcriptional activator of purine-rich elements.\",\n      \"evidence\": \"cDNA cloning from insulinoma library, transient transfection/transactivation in HeLa and beta-cell lines\",\n      \"pmids\": [\"1454839\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No chromatin context demonstrated\", \"No loss-of-function for insulin expression\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"How transcription terminates between closely spaced genes was mechanistically opaque; showing that MAZ binding sites are required for termination between complement genes C2/Factor B, and that MAZ bends DNA, provided a physical model for termination at gene boundaries.\",\n      \"evidence\": \"In vitro binding, DNA bending assay, in vivo termination assay with site mutations\",\n      \"pmids\": [\"7988563\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural data on MAZ-induced DNA bend\", \"Mechanism linking bending to polymerase release not established\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Whether MAZ and Sp1 share or compete for regulatory elements was unclear; footprinting of the serotonin 1a receptor and later the PNMT promoter revealed overlapping MAZ/Sp1 binding sites, establishing competitive co-occupancy as a regulatory mechanism at GC-rich promoters.\",\n      \"evidence\": \"DNase I footprinting, EMSA competition, reporter assays across multiple promoters\",\n      \"pmids\": [\"8626793\", \"14573768\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide extent of MAZ/Sp1 competition unknown at this stage\", \"Whether competition is cell-type-specific not addressed\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"MAZ had been characterized only as an activator; demonstrating GAL4-fusion-mediated repression mapped to the N-terminal proline/alanine-rich domain established MAZ as a bifunctional transcription factor capable of both activation and repression.\",\n      \"evidence\": \"GAL4 fusion repressor assay, deletion mapping, reporter assay in COS cells\",\n      \"pmids\": [\"10383467\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cofactors mediating repression not identified at this stage\", \"No in vivo repression data\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Post-translational regulation of MAZ DNA-binding activity was unknown; identification of CKII-mediated phosphorylation at Ser480 as required for maximum DNA binding and transactivation established phosphorylation as a key regulatory switch.\",\n      \"evidence\": \"In vitro kinase assay, Ser480Ala mutagenesis, EMSA, luciferase reporter\",\n      \"pmids\": [\"10448092\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo phosphorylation dynamics not characterized\", \"Other kinase inputs not explored\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Whether MAZ could affect post-transcriptional gene regulation was unknown; showing that MAZ elements pause elongating RNA polymerase II within FGFR2 and thereby influence co-transcriptional alternative splicing linked MAZ to RNA processing.\",\n      \"evidence\": \"Minigene reporter, RT-PCR elongation assay, in vitro transcription\",\n      \"pmids\": [\"15126509\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct protein requirement (versus DNA element requirement) not fully separated\", \"Genome-wide scope of MAZ-dependent splicing unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"The relationship between MAZ and non-canonical DNA structures was unexplored; demonstrating that MAZ binds and activates transcription through G-quadruplex structures in the KRAS promoter, and that G4-decoy oligonucleotides block this, established G-quadruplex recognition as a functional mode of MAZ action.\",\n      \"evidence\": \"G4 competitive binding assay, reporter assay, xenograft mouse model\",\n      \"pmids\": [\"23471001\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of MAZ–G4 interaction unresolved\", \"Whether G4 binding is separable from duplex binding not determined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Whether MAZ simply bound or actively remodeled G-quadruplexes was unknown; reconstitution showing MAZ unfolds HRAS promoter G-quadruplexes and promotes duplex formation established MAZ as a G4-resolving factor that activates transcription by unwinding inhibitory structures.\",\n      \"evidence\": \"In vitro G-quadruplex unfolding assay with MAZ-GST, mutagenesis, reporter assay\",\n      \"pmids\": [\"25013182\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Energy source for unfolding not identified\", \"In vivo G4 resolution not demonstrated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"A second kinase input to MAZ was undefined; showing that Akt phosphorylates MAZ at Thr385 to release it from the p53 promoter, thereby derepressing p53, revealed a phosphorylation-dependent toggle between MAZ occupancy and gene activation.\",\n      \"evidence\": \"In vitro kinase assay, ChIP, site-directed mutagenesis, reporter assay\",\n      \"pmids\": [\"26902421\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab finding\", \"Interplay between CKII (Ser480) and Akt (Thr385) phosphorylation not examined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The in vivo developmental requirement for MAZ was unknown; CRISPR knockout of Maz in mice caused perinatal lethality with kidney and urinary tract anomalies (CAKUT) and haploinsufficiency for bladder development, while knockdown in human cells disrupted S-phase entry and Wnt morphogen expression.\",\n      \"evidence\": \"CRISPR-Cas9 mouse model, siRNA knockdown with transcriptome analysis, cell cycle assay\",\n      \"pmids\": [\"29432158\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets mediating CAKUT not delineated\", \"Human genetic CAKUT association not established\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Whether MAZ functioned in higher-order chromatin organization was entirely open; demonstrating that MAZ physically interacts with cohesin, independently arrests cohesin sliding, pauses RNA polymerase II, and insulates enhancer–promoter communication established MAZ as a chromatin architectural protein analogous to CTCF.\",\n      \"evidence\": \"Co-IP, Hi-C, insulator reporter assay, siRNA depletion, RNAPII pausing assay\",\n      \"pmids\": [\"33558242\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of cohesin arrest unknown\", \"Whether MAZ and CTCF act redundantly or synergistically at all shared sites unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"The functional consequence of MAZ at CTCF boundaries in developmental gene regulation was untested; a genome-wide CRISPR screen and MAZ motif deletions at Hox clusters showed that MAZ cooperates with CTCF to insulate posterior Hox genes, with loss causing homeotic transformations in mice.\",\n      \"evidence\": \"CRISPR KO screen, MAZ motif deletions, Hi-C, biochemical Co-IP with RAD21, mouse phenotyping\",\n      \"pmids\": [\"35145304\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MAZ insulation extends beyond Hox clusters genome-wide not fully mapped\", \"Mechanism distinguishing MAZ-dependent from CTCF-only boundaries undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"How MAZ concentrates transcriptional machinery at target promoters was mechanistically unexplained; showing that MAZ forms phase-separated condensates via ZF3-5, that G-quadruplex binding by ZF2 mobilizes MAZ into these condensates to colocalize with BRD4/MED1/CDK9, and that both activities are required for target gene activation, unified G4 recognition with phase separation as a transcriptional activation mechanism.\",\n      \"evidence\": \"Zinc finger mutagenesis, in vitro phase separation, immunofluorescence colocalization, xenograft model\",\n      \"pmids\": [\"38316778\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo dynamics of MAZ condensates not resolved\", \"Whether phase separation contributes to insulator or repressor functions not tested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"The cofactor basis for MAZ-mediated transcriptional repression was largely uncharacterized; immunoaffinity purification identified an MAZ–HDAC1–RBBP7–CUL4B complex that cooperatively silences CSK by catalyzing histone deacetylation at its promoter, providing a mechanistic basis for MAZ repressor function.\",\n      \"evidence\": \"Immunoaffinity purification/mass spectrometry, ChIP, Co-IP, RNA-seq, xenograft model\",\n      \"pmids\": [\"40618395\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HDAC1 recruitment is general to all MAZ-repressed targets unknown\", \"Structural basis of MAZ–HDAC1 interaction not determined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of MAZ–cohesin interaction and cohesin arrest, the genome-wide rules distinguishing MAZ-activated from MAZ-repressed targets, whether MAZ phase separation contributes to its insulator and repressor functions, and whether human MAZ mutations cause developmental syndromes analogous to mouse CAKUT/Hox phenotypes.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure of MAZ bound to DNA or cohesin\", \"No human Mendelian disease formally attributed to MAZ variants in the literature\", \"Interplay between CKII and Akt phosphorylation in regulating MAZ chromatin occupancy not investigated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 1, 2, 3, 7, 11, 13, 15, 17, 18, 21, 28, 29, 30, 31]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 3, 5, 7, 15, 17, 21, 28, 30, 31, 32]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [14, 27]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [27, 29]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 5, 11, 21, 27, 28, 29, 30, 32, 33]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [27, 30]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [27, 29]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 2, 3, 5, 7, 15, 17, 21, 28, 30, 31, 32]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [27, 29, 32]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [23, 26, 29]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [22, 23, 26]}\n    ],\n    \"complexes\": [\n      \"MAZ–HDAC1–RBBP7–CUL4B repressive complex\"\n    ],\n    \"partners\": [\n      \"RAD21\",\n      \"CTCF\",\n      \"HDAC1\",\n      \"RBBP7\",\n      \"CUL4B\",\n      \"EWSR1\",\n      \"SP1\",\n      \"SLC39A7\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}