{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSchlafen‐5 (SLFN5) is an interferon‐inducible member of the Schlafen protein family that exhibits multifaceted and context‐dependent roles in cancer. In melanoma cells, for example, basal SLFN5 expression is suppressed but is strongly induced by interferon‑α, an effect that limits anchorage‑independent growth and invasion."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " Similarly, in renal cell carcinoma, SLFN5 exerts an inhibitory effect on cell motility by downregulating matrix metalloproteinases."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " In addition, early findings suggest that SLFN5 correlates with the progression of precancerous gastric lesions (intestinal metaplasia) and may serve as a potential biomarker in this setting."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " In contrast, in glioblastoma SLFN5 functions as a transcriptional corepressor of STAT1 to promote motility and invasiveness"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": ", and in lung cancer its overexpression drives epithelial‐to‐mesenchymal transition via enhanced β‑catenin translocation and regulation of EMT factors such as Snail and E‑cadherin."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " While its role in breast cancer remains to be fully determined"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": ", studies in pancreatic ductal adenocarcinoma have shown that SLFN5 promotes S‑phase progression by binding and inhibiting the transcriptional repressor E2F7, thereby accelerating tumor cell proliferation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " In castration‑resistant prostate cancer, SLFN5 is under androgen receptor regulation and enhances amino acid transport and mTORC1 signaling through interaction with ATF4, cumulatively supporting tumor growth."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in tumor biology, SLFN5 also functions as an antiviral factor. In the context of herpes simplex virus 1 infection, SLFN5 binds viral DNA and limits the recruitment of RNA polymerase II to viral promoters, an antiviral action that is counteracted by the viral E3 ubiquitin ligase ICP0."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": " Furthermore, in HIV‑1 infection, overexpressed SLFN5 reduces viral mRNA levels by binding specific sequences in the viral U5‑R region and promoting repressive epigenetic modifications through interactions with components of the PRC2 complex, thereby blocking viral transcription and the activation of latent virus."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Efstratios Katsoulidis, Evangelos Mavrommatis, Jennifer Woodard, et al. 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