{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nTRAIP is a conserved RING‐type E3 ubiquitin ligase that plays a critical role in the cellular response to DNA damage and replication stress. By ubiquitylating the replicative helicase (CMG), TRAIP dictates repair pathway choice at DNA interstrand crosslinks—promoting the rapid, error‐free NEIL3-dependent repair when short ubiquitin chains are attached, while longer chains favor CMG unloading to activate the Fanconi anemia pathway. TRAIP rapidly accumulates at DNA lesions—where it is essential for efficient ATR‐dependent checkpoint activation, replication fork progression through UV-induced damage, and the recruitment of downstream repair proteins such as RAP80—further underscoring its importance in homologous recombination. In addition, studies in Drosophila have revealed that TRAIP (NOPO) ubiquitylates translesion polymerases to facilitate bypass of DNA lesions, and post-translational modifications such as SUMOylation help ensure its proper nuclear retention. Moreover, rapid degradation of TRAIP during S-phase triggers replication–transcription conflicts leading to G2 arrest and senescence, highlighting its vital role in maintaining genome integrity."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its functions in the DNA damage response, TRAIP is crucial for proper cell cycle regulation and mitosis. Its expression is cell cycle dependent—peaking during G2/M—and its ligase activity is required for the correct timing of mitotic progression, the fidelity of chromosome segregation, and the maintenance of spindle assembly checkpoint integrity. TRAIP also forms homo-dimers via a coiled-coil domain, and its transcription is driven in part by E2F family factors, further linking its activity with cell cycle progression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "11", "end_ref": "14"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond genome surveillance, TRAIP (also known as TRIP or TRAF-interacting protein) modulates inflammatory and oncogenic signaling. By interacting with TRAF proteins, TRAIP negatively regulates TNF-induced NF‑κB activation—a function that impacts proinflammatory cytokine production and innate immune responses. Dysregulation of TRAIP has been reported in several malignancies, with overexpression linked to oncogenic processes in liver, triple negative breast, and prostate cancers, as well as alterations in histone H2B monoubiquitination in lung adenocarcinoma and inhibition of epithelial-mesenchymal transition in choroidal melanoma. Genetic studies have further implicated the 3p21 locus, where TRAIP is located, in inflammatory disorders such as Crohn’s disease."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "15", "end_ref": "25"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "R Alex Wu, Daniel R Semlow, Ashley N Kamimae-Lanning, et al. 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