{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSIAH2 is a RING‐type E3 ubiquitin ligase that plays a central role in numerous signaling cascades by targeting key regulatory proteins for proteasomal degradation. Under conditions of low oxygen, SIAH2 degrades prolyl‐hydroxylases (e.g. PHD3) to stabilize HIF‐1α and modulate the hypoxic response (e.g."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In estrogen receptor–positive breast cancer cells, estrogen induces SIAH2 expression that in turn triggers degradation of the nuclear receptor corepressor N‐CoR, thereby altering transcriptional networks."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " In addition, SIAH2 is activated by phosphorylation events mediated by p38 MAPK and DYRK2 to enhance its ability to degrade targets such as PHD3, further fine‐tuning HIF‐1α levels."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "4", "end_ref": "6"}]}, {"type": "t", "text": " SIAH2 also promotes oncogenic signaling by reducing the levels of Hippo pathway kinase LATS2 (thus stimulating YAP activity), and by selectively degrading a repressive pool of the androgen receptor to enhance transcription of growth‐promoting genes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in hypoxic and hormone‐driven signaling, SIAH2 also impacts additional cellular processes by targeting a broad spectrum of proteins. For example, SIAH2 directly monoubiquitinates α–synuclein to drive its aggregation, which is implicated in neurodegenerative processes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": " It also mediates ubiquitin‐dependent degradation of substrates in key developmental and signaling pathways, including the Wnt pathway through Axin regulation"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": "and the epithelial–mesenchymal transition by controlling levels of the transcription factor ZEB1."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": " In addition, SIAH2 targets proteins such as PML (a tumor suppressor member of the TRIM family;"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": "and ACK1"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "14"}]}, {"type": "t", "text": ", while its own function is modulated by oligomerization"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "15"}]}, {"type": "t", "text": "and by regulation from deubiquitinating enzymes such as USP13."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "16"}]}, {"type": "t", "text": " Moreover, SIAH2 controls circadian rhythm protein turnover via Rev‐Erbα"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "17"}]}, {"type": "t", "text": ", regulates the stability of the cell‐cycle checkpoint kinase CHK2"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "18"}]}, {"type": "t", "text": ", and modulates components of the cytoskeleton and myosin phosphatase (via MYPT1 degradation;."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "19"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nSIAH2’s versatile substrate repertoire further extends its impact on tumor progression and cellular homeostasis. In leukemia, SIAH2 protects oncogenic fusion proteins such as AF4–MLL from degradation"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "20"}]}, {"type": "t", "text": ", while in breast cancer, Src‐activated SIAH2 degrades the tumor suppressor C/EBPδ, thereby contributing to cell proliferation and invasiveness."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "21"}]}, {"type": "t", "text": " It also downregulates Nrf2 under hypoxia"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "22"}]}, {"type": "t", "text": "and fine‐tunes its substrate specificity through defined degron interactions."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "23"}]}, {"type": "t", "text": " In non–small cell lung cancer, elevated SIAH2 levels correlate with disease aggressiveness"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "24"}]}, {"type": "t", "text": ", and in gastric cancer, H. pylori–induced acetylation of SIAH2 enhances the degradation of adhesion proteins (TES and FLNC), promoting migration and invasion."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "25"}]}, {"type": "t", "text": " Viral pathogens, such as Zika virus, also appear to hijack SIAH2 to mediate STAT2 degradation and antagonize host interferon responses"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "26"}]}, {"type": "t", "text": ", while in chronic myeloid leukemia, targeting of the SIAH2–PHD3–HIF-1α–VEGF axis improves sensitivity to tyrosine kinase inhibitors."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "27"}]}, {"type": "t", "text": " Additional studies reveal SIAH2’s role in modulating dimerization properties"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "28"}]}, {"type": "t", "text": ", its influence on regulatory T cell proliferation to affect antitumor immunity"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "29"}]}, {"type": "t", "text": ", and its control over stress‐responsive enzymes such as HO‐1."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "30"}]}, {"type": "t", "text": " Finally, integrative reviews highlight the dual and context‐dependent roles of SIAH2 in tumorigenesis and cancer progression"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "31"}]}, {"type": "t", "text": ", emphasizing its potential as a therapeutic target.\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Koh Nakayama, Ian J Frew, Mette Hagensen, et al. 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