{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRCHY1 (also known as Pirh2) is a p53‐inducible RING-H2 domain E3 ubiquitin ligase that plays a pivotal role in the regulation of p53 and its family members. By directly binding to p53 through its zinc–coordinating motifs, RCHY1 promotes ubiquitination and proteasome-mediated degradation of p53, thereby fine-tuning p53’s transcriptional and cell-cycle checkpoint activities. This autoregulatory feedback mechanism is critical for maintaining normal cell proliferation and apoptosis and, when dysregulated, contributes to tumorigenesis in diverse cancers. RCHY1 is also subject to transcriptional regulation by p63 isoforms, further integrating its function into the broader p53 family network."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "19"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond regulating p53, RCHY1 targets a spectrum of substrates that are crucial for cell cycle progression and genomic integrity. It promotes the ubiquitin-dependent degradation of cell cycle inhibitors such as p27, modulates the organization of intermediate filaments, and influences checkpoint kinase activity. RCHY1 also interacts with transcription factors and nuclear receptors—including the androgen receptor—to alter transcriptional outcomes in hormone-responsive tissues. Furthermore, it affects proteins involved in DNA repair (for example, DNA polymerase eta), and through interactions with other regulators such as SCYL1-BP1 and components of the COPI complex, it impacts protein trafficking and cellular homeostasis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "20", "end_ref": "33"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nRCHY1 is itself tightly regulated through mechanisms including post-translational modifications and alternative splicing. Phosphorylation events modulate its stability and ligase activity, while the generation of distinct isoforms may alter its substrate specificity. In addition, RCHY1 participates in non-canonical cellular processes such as the regulation of autophagy, ribosome-associated quality control via direct recognition of polyalanine degrons, and host antiviral responses. These diverse regulatory inputs, along with its altered expression in malignancies (including glioma, endometrial, breast, and oral carcinomas), underscore the potential of RCHY1 as both a biomarker and a therapeutic target in cancer and other pathological conditions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "34", "end_ref": "39"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "L K Beitel, Y A Elhaji, R Lumbroso, et al. 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