{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Importin‐11 (IPO11) is emerging as a critical nuclear transport receptor that mediates the import of an array of biologically important cargo proteins, thereby modulating diverse cellular pathways. For instance, IPO11 directly facilitates the nuclear entry of β‐catenin—a central effector of canonical Wnt signaling—in colorectal cancer cells, with deletion of IPO11 resulting in reduced nuclear β‐catenin accumulation and diminished downstream target gene activation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In addition, IPO11 works in concert with ubiquitin‐conjugating enzymes such as UbcM2 to link protein ubiquitination with nucleocytoplasmic transport, a mechanism that also contributes to proper distribution and activity of transcription factors such as Nrf2"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": "and establishes a novel regulatory connection between the ubiquitin system and nuclear import."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Beyond signaling, alterations in IPO11 are implicated in cancer progression. In bladder cancer, IPO11 copy number amplification and overexpression correlate with advanced tumor stage, increased invasiveness, and poor patient prognosis, supporting its role as a facilitator of oncogenic processes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " Similarly, in glioma cells, silencing of IPO11 suppresses malignant phenotypes and inactivates the Wnt/β‐catenin pathway, indicating that IPO11 maintains oncogenic signaling in these tumors."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Moreover, large‐scale genetic analyses have linked rare variants in the IPO11 region to neuropsychiatric conditions such as attention deficit hyperactivity disorder, suggesting that IPO11 may also influence brain function."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " In mouse models, IPO11 is indispensable for normal embryogenesis with knockout mutations causing embryonic lethality, further underscoring its fundamental role in development."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": " Finally, the identification of the structural features of IPO11 has opened opportunities for the design of specific inhibitors aimed at disrupting its function in malignancies, such as colorectal cancer, where its activity is closely linked to aberrant nuclear signaling."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Together, these studies position IPO11 as a pivotal mediator of nuclear import that not only governs the subcellular localization of key regulatory proteins but also impacts transcriptional control, cell proliferation, tumor progression, and development.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Monika Mis, Siobhan O'Brien, Zachary Steinhart, et al. 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