{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSLC39A4 encodes the ZIP4 protein, a member of the ZIP zinc transporter family that is indispensable for dietary zinc uptake across the apical membrane of enterocytes. Its proper function is essential for maintaining systemic zinc homeostasis, and loss‐of‐function mutations lead to acrodermatitis enteropathica—a disorder characterized by impaired zinc absorption and associated dermatologic and gastrointestinal abnormalities. In addition, ZIP4 levels are tightly regulated in response to zinc availability through mechanisms such as zinc‐induced endocytosis, ubiquitin-mediated degradation, and adaptive transcriptional upregulation during zinc deficiency; developmental studies in the intestine further underscore its critical role in zinc processing from birth."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its physiological role in zinc absorption, aberrant overexpression of ZIP4 is implicated in the pathogenesis and progression of several cancers, notably pancreatic adenocarcinoma. Elevated ZIP4 expression increases intracellular zinc levels, which can activate oncogenic signaling pathways such as the CREB–miR-373 axis and the PI3K/Akt cascade, thereby enhancing tumor cell proliferation, invasion, metastasis, and resistance to apoptotic stimuli. Furthermore, the secretion of ZIP4 in tumor‐derived exosomes contributes to cancer growth and dissemination, supporting its potential value as a diagnostic biomarker and therapeutic target in pancreatic, lung, prostate, and head and neck malignancies."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "30"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nRecent structural and biophysical investigations have further refined our understanding of ZIP4’s mechanism. 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