{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRNF8 is a pivotal E3 ubiquitin ligase that orchestrates the DNA damage response by being rapidly recruited to double‐strand break (DSB) sites through phospho‐dependent interactions with the mediator MDC1. Once at damage sites, RNF8 catalyzes the ubiquitination of chromatin components—including histone H2A, its variant H2AX, and even PCNA—to generate ubiquitin signals that serve as docking platforms for downstream repair factors such as 53BP1, BRCA1, PTIP, and others. In cooperation with conjugating enzymes like UBC13 and allied E3 ligases such as RNF168, RNF8 facilitates the proper assembly of repair complexes that mediate both homologous recombination and nonhomologous end‐joining, thereby ensuring checkpoint activation, chromatin remodeling, and overall genome integrity maintenance."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "17"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to these canonical roles, RNF8 finely tunes the chromatin landscape and the stability of key protein substrates. Its ubiquitin ligase activity not only tags histones to enable chromatin decondensation (thereby promoting dynamic protein assemblies at damage foci) but also triggers the turnover of factors that could otherwise impede repair. For example, RNF8‐mediated ubiquitination regulates the degradation of surplus nuclear 53BP1, modulates the stability of repair‐associated proteins such as the p12 subunit of DNA polymerase δ and NONO, and even directs histone H3 modifications that facilitate nucleosome disassembly. Moreover, deubiquitylating enzymes (DUBs) counterbalance its activity, underscoring the importance of dynamic ubiquitin signaling for efficient checkpoint resolution and repair fidelity."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "18", "end_ref": "25"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in DNA repair and chromatin remodeling, emerging evidence implicates RNF8 in the regulation of oncogenic processes. RNF8 contributes to tumor progression not only by ensuring genomic stability but also by directly modulating transcription factor activity and signal transduction pathways. For instance, RNF8 promotes the activation of EMT regulators such as Twist and Slug via K63‐linked ubiquitination, acts as a co‐activator for estrogen receptor α, and facilitates β‐catenin nuclear translocation to drive c-Myc expression. These multifaceted activities link RNF8 to enhanced cell migration, invasion, chemoresistance, and metastasis in various cancers, placing it at the nexus of DNA repair and tumorigenesis. Furthermore, its connections with factors like L3MBTL2 and its regulation by microRNAs emphasize its potential as a therapeutic target."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "26", "end_ref": "29"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Niels Mailand, Simon Bekker-Jensen, Helene Faustrup, et al. 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