{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n MAFG is a small Maf protein that plays multiple, context‐dependent roles in transcriptional regulation. In response to oxidative or electrophilic stress, MAFG forms heterodimers with CNC proteins such as NRF2 – a partnership that is essential for binding antioxidant response elements (AREs) and thereby for the induction of cytoprotective genes. This NRF2–MAFG complex not only reinforces NRF2 nuclear retention and signaling (see"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "but also participates in an autoregulatory feedback mechanism through which the MAFG gene itself is induced under stress conditions."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " Similarly, studies using mouse genetics confirm that the small Mafs—including MAFG—are indispensable for proper activation of ARE‐dependent genes during embryogenesis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "3", "end_ref": "5"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In addition to its cooperative role with NRF2 in antioxidant defense, MAFG is co‐opted in oncogenic settings. In colorectal cancer harboring mutant BRAF, for example, MAFG is upregulated and binds to target promoters – such as that of the mismatch repair gene MLH1 – where it recruits a corepressor complex (including BACH1, CHD8, and DNMT3B) that mediates promoter hypermethylation and transcriptional silencing."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " In cholestatic liver injury and cholangiocarcinoma, elevated MAFG levels—also driven by oncogenic signals—correlate with enhanced tumor growth and a repressive shift in gene expression that promotes oncogenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n MAFG also functions downstream of metabolic nuclear receptors. It is directly induced by the farnesoid X receptor (FXR) and, once upregulated, represses key genes of the bile acid synthesis pathway. Thus, in the liver MAFG contributes to the fine‐tuning of bile acid homeostasis, with its dysregulation being associated with cholestatic injury."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Beyond its roles in stress response and metabolic regulation, MAFG participates in cell type–specific developmental processes. In the hematopoietic system and in the liver, for example, MAFG (in concert with related factors such as MAFK and p45NF‐E2) governs differentiation programs—contributing to megakaryopoiesis and even to normal lens and neuronal development."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "12", "end_ref": "15"}]}, {"type": "t", "text": " In lung adenocarcinoma, a long noncoding RNA (MAFG‐AS1) acts as a sponge for microRNAs to de‐repress nearby MAFG expression, ultimately promoting tumor cell proliferation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Structural and biochemical studies reveal that the DNA‐binding specificity and regulatory outcome of MAFG (whether acting as an activator or repressor) depend on its dimerization partner and post‐translational modifications. For instance, its ability to bind extended GC‐rich MAF recognition elements (MAREs) is elucidated by analyses of the MAFG–DNA complex"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "16"}]}, {"type": "t", "text": ", and sumoylation of MAFG is required for its repressive function by facilitating the recruitment of histone deacetylases."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "18"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Finally, MAFG (like other small Maf proteins) can influence inflammatory and immunological processes. In IFN‑γ–stimulated macrophages, for example, repression of a subset of enhancer activities enriched for Maf binding motifs contributes to the suppression of M2‐like homeostatic genes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "19"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In summary, MAFG is a multifaceted transcriptional regulator. It functions as an essential cofactor for NRF2 in orchestrating antioxidant and detoxification responses; it is subverted by oncogenic signals to mediate epigenetic gene silencing; it integrates metabolic signals to control bile acid synthesis; and it contributes to developmental and cell identity programs. Its activity is finely modulated by partner choice and post‐translational modifications, underscoring its versatile role in both normal physiology and disease."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}, {"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": "\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Fumiki Katsuoka, Hozumi Motohashi, James Douglas Engel, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Nrf2 transcriptionally activates the mafG gene through an antioxidant response element."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M411451200"}], "href": "https://doi.org/10.1074/jbc.M411451200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15574414"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15574414"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Wenge Li, Siwang Yu, Tong Liu, et al. 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