{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRNF20, the human homolog of the yeast Bre1 E3 ubiquitin ligase, is the principal enzyme responsible for monoubiquitinating histone H2B on lysine 120 (H2Bub1). This chromatin modification is pivotal for establishing histone crosstalk that promotes subsequent methylation events—most notably on histone H3 at lysines 4 and 79—thereby facilitating efficient transcription initiation and elongation. Acting in concert with ubiquitin‐conjugating factors (such as Rad6) and transcription‐regulatory complexes including PAF1 and p53, RNF20 helps orchestrate gene expression programs that maintain proper cell cycle control and cellular growth."}, {"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": "\nBeyond its central role in transcriptional regulation, RNF20 is equally critical for maintaining genome stability. By depositing H2Bub1 at sites of DNA double‐strand breaks, RNF20 facilitates chromatin remodeling that is essential for the recruitment of repair proteins such as RAD51 and BRCA1, thereby promoting homologous recombination repair. Moreover, RNF20 contributes to faithful mitotic progression—for instance, through interaction with mitotic motor proteins that ensure proper spindle assembly. Structural studies, including cryo‐electron microscopy analyses of its RING domain and its interfaces with ubiquitin‐conjugating enzymes, have begun to reveal the molecular underpinnings of RNF20’s diverse roles."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nDeregulation of RNF20 has multifaceted pathological implications. Its altered activity contributes to oncogenesis in diverse contexts—such as MLL‐fusion–driven leukemogenesis, and aberrant modulation of tumor suppressor and oncogene expression in prostate, ovarian, and liver cancers. RNF20 also modulates inflammatory and immune signaling pathways, influencing conditions like sepsis and inflammation‐associated tumorigenesis. In addition, certain pathogens subvert RNF20 function to favor their replication; for example, adenoviral E1A and the SARS‑CoV‑2 main protease target RNF20 to disrupt host antiviral responses. Further, post‐translational downregulation of RNF20—illustrated by its degradation via ferritinophagy under iron deficiency—impairs myogenic differentiation, while its regulation of LSD1 stability and cooperation with the FACT complex to potentiate HIF‑1–dependent transcription underscore its broad impact on disease."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "14", "end_ref": "25"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "William W Hwang, Shivkumar Venkatasubrahmanyam, Alexandra G Ianculescu, et al. 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