{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nTFAP4, a basic helix‐loop‐helix transcription factor and direct target of c‐MYC, plays a central role in regulating cell cycle progression and proliferation. In multiple cellular models, TFAP4 has been shown to promote cell cycle reentry through repression of inhibitors such as p21 and to ensure the fidelity of mitotic progression via regulated proteasomal degradation. Disruption of its controlled turnover leads to mitotic defects, DNA damage signaling, and impaired cytokinesis, underlining its critical role in maintaining proper cell division and genomic stability."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "6"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the context of cancer, aberrant TFAP4 expression is frequently associated with aggressive tumor behavior and poor patient outcomes. In colorectal, hepatocellular, neuroblastoma, prostate, non‐small cell lung cancer, and lymphoid malignancies, elevated TFAP4 levels contribute to oncogenic processes by directly transactivating genes that drive epithelial–mesenchymal transition, stemness, migration, invasion, and metastasis. TFAP4 can activate key effectors—including DVL1, LEF1, LAPTM4B, L‐plastin, and IGF2BP1—thereby engaging oncogenic pathways such as Wnt/β‐catenin and PI3K/AKT. Moreover, TFAP4 activity is further sustained by feedback mechanisms involving microRNAs and co‐activators (e.g. USP22), which ultimately promote tumor initiating cell features and chemoresistance."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "17"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nTFAP4 also influences stem cell dynamics and differentiation in both normal development and tumorigenesis. Studies in genetically engineered mouse models have demonstrated that TFAP4 regulates intestinal stem cell homeostasis and adenoma initiation via modulation of pathways such as Wnt/β‐catenin and Notch. In addition, TFAP4 participates in transcriptional networks that can repress oncogenes like HDM2 and is implicated in neural crest development—with alterations in its expression linked to conditions such as Hirschsprung’s disease. Furthermore, TFAP4 can be entwined in feedback loops (for example, via regulation of CCL23 expression) that further underscore its context‐dependent roles in both promoting and restraining cell proliferation and differentiation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "18", "end_ref": "21"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Peter Jung, Antje Menssen, Doris Mayr, et al. 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