{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nTranscription adaptor 3 (TADA3), also known as human ADA3 (hADA3), is an evolutionarily conserved transcriptional coactivator that directly interacts with a diverse set of transcription factors—including p53, retinoic acid receptor α (RARα), retinoid‐X receptor (RXRα), and estrogen receptors—as well as with other coactivators. By promoting transcription factor acetylation and protein stabilization, TADA3 enhances p53‐mediated transactivation and genomic stress responses, while its functional integrity is essential for hormone‐dependent gene expression. Loss or disruption of TADA3 function—exemplified by its targeted degradation by high‐risk human papillomavirus E6—results in the abrogation of p53 activity and nuclear receptor signaling, contributing to cell cycle deregulation and oncogenic transformation."}, {"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": "\nWithin histone acetyltransferase (HAT) complexes such as SAGA and ATAC, TADA3 acts as a critical subunit that helps modulate the catalytic function of enzymes like GCN5. Its role in shaping chromatin architecture through regulated histone acetylation is essential for proper gene expression and cell cycle progression—a notion supported by studies showing embryonic lethality and proliferation defects upon Ada3 deletion. Moreover, TADA3 is dynamically regulated by post‐translational modifications; for example, acetylation by p300 (often downstream of receptor tyrosine kinase–AKT signaling) fine‐tunes its activity and stability, underscoring its central position in linking environmental cues to chromatin remodeling and transcriptional control."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nEmerging evidence further implicates TADA3 in the regulation of apoptotic pathways and tumor suppression. By coordinating with factors such as PACS1, TADA3 facilitates proper mitochondrial apoptotic signaling and p14ARF-induced p53 acetylation, both of which are crucial for senescence and intrinsic cell death responses. In oncogenic settings—such as cervical cancer—HPV E6-mediated degradation of TADA3, even in the absence of direct p53 loss, can subvert these tumor-suppressive mechanisms, enabling cell immortalization. Additionally, aberrant TADA3 expression or mislocalization has been linked to aggressive disease phenotypes and poor clinical outcomes in breast, gastric, and non-small cell lung cancers, underscoring its dual relevance as both a mediator of normal cellular homeostasis and a potential contributor to tumorigenesis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "13", "end_ref": "20"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Ajay Kumar, Yongtong Zhao, Gaoyuan Meng, et al. 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