{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nNET1, a RhoA‐specific guanine nucleotide exchange factor (GEF), is distinguished by regulatory domains within its N terminus that control its subcellular localization. Two nuclear localization signals (NLS) embedded in the N terminus mediate nuclear import, while a pleckstrin homology (PH) domain can function as a nuclear export signal. Such features indicate that NET1 is capable of nucleocytoplasmic shuttling, and its oncogenic activation has been linked to alterations in its localization, with forced cytoplasmic presence leading to enhanced Rho activation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nPost‐translational modifications further modulate NET1’s function. Key studies reveal that phosphorylation by PAK1 on specific serine residues diminishes NET1’s guanine nucleotide exchange activity, thereby reducing its capacity to promote actin stress fiber formation. Additionally, mutations in NET1’s amino terminus that affect its nuclear localization or its PDZ binding motif demonstrate that the protein’s contribution to cytoskeletal remodeling can be dissociated from its transforming ability."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its biochemical regulation, NET1 plays diverse roles in cellular behavior and tissue organization. In mammary epithelial cells, NET1 is essential for proper ductal development and cellular proliferation, with its deregulation contributing to breast cancer cell motility, invasion, and tumor growth. Similar functional themes extend to other cell types; for instance, in hepatocellular carcinoma models, targeting NET1 by siRNA conjugates affects tumor stiffness and growth, while in macrophages NET1 is critical for RhoA activation, actin polymerization, adhesion, and motility in vitro—even though its absence does not hinder in vivo recruitment during inflammation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "5", "end_ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFinally, recent evidence implicates NET1 in the regulation of meiotic progression in oocytes. Through a NET1–HACE1–RAC1 signaling pathway, NET1 contributes to the control of meiotic events, with perturbations in this axis leading to maturation defects."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Anja Schmidt, Alan Hall "}, {"type": "b", "children": [{"type": "t", "text": "The Rho exchange factor Net1 is regulated by nuclear sequestration."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M111108200"}], "href": "https://doi.org/10.1074/jbc.M111108200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "11839749"}], "href": "https://pubmed.ncbi.nlm.nih.gov/11839749"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Eun Hyeon Song, Wonkyung Oh, Arzu Ulu, et al. 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