{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Keratin 17 (KRT17) is a multifunctional intermediate filament protein with diverse roles in epithelial homeostasis, tumorigenesis, inflammation, and hair follicle biology. In various epithelial cancers—including breast, cervical, and squamous cell carcinomas—elevated KRT17 expression is associated with aggressive behavior and poor clinical outcomes, making it a useful prognostic marker."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": " Mechanistically, KRT17 can bind adaptor proteins such as 14-3-3σ to promote mTOR signaling and protein synthesis, thereby regulating cell growth and size in keratinocytes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " In the context of hair follicle biology, loss of KRT17 leads to premature apoptosis and aberrant cycling, with evidence showing interactions with TNFα signaling components like TRADD to modulate the anagen–catagen transition."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " Moreover, KRT17 expression is modulated post‐transcriptionally by microRNAs such as miR-31, thereby influencing hair differentiation programs."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": " In inflammatory conditions such as psoriasis, proinflammatory cytokines—including IL-17A and IL-22—upregulate KRT17 expression via STAT-dependent pathways, contributing to an autoimmune loop that accentuates cytokine production and perpetuates skin inflammation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " In addition, nuclear functions of KRT17 have been linked to the regulation of transcriptional mediators like Aire, further amplifying proinflammatory and oncogenic signals in skin tumors."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": " Collectively, these findings establish KRT17 as a central integrator of cytoskeletal organization, signal transduction, and immune modulation, with significant prognostic and therapeutic implications across a spectrum of epithelial pathologies"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "–."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": "\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Matt van de Rijn, Charles M Perou, Rob Tibshirani, et al. 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