{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Interferon‐related developmental regulator 1 (IFRD1), also known as TIS7 or PC4, is emerging as a multifunctional transcriptional co‐regulator that modulates diverse biological processes by affecting gene expression through epigenetic and post‐transcriptional mechanisms. For example, IFRD1 mRNA translation is controlled by an upstream open reading frame that renders its synthesis stress‐responsive, highlighting a mechanism by which cells rapidly adjust the expression of key regulators under adverse conditions."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In immune cells, IFRD1 functions as a histone deacetylase–dependent transcriptional co‐regulator that modulates NF‑κB activity during neutrophil differentiation, thereby influencing effector responses and modifying the severity of cystic fibrosis lung disease."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " In epithelial cells infected by high‐risk human papillomavirus, IFRD1 expression is augmented in an epidermal growth factor receptor–dependent manner, leading to impaired acetylation of NF‑κB/RelA and diminished pro‐inflammatory cytokine production."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In the context of muscle and nerve tissue, IFRD1 acts as a critical modulator of differentiation and regeneration. In skeletal muscle, IFRD1 promotes myogenesis by serving as a co‐activator of MyoD and MEF2C while counteracting inhibitory signals from HDACs and NF‑κB, with genetic ablation or loss of IFRD1 delaying muscle regeneration."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "5", "end_ref": "7"}]}, {"type": "t", "text": " Similarly, in dorsal root ganglion neurons, loss of IFRD1 (TIS7) alters neurite initiation and branching through deregulation of retinoic acid signaling via increased expression of CRABP II."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Furthermore, IFRD1 is involved in skeletal homeostasis. Its expression in osteoblasts suppresses osteoblast differentiation and favors osteoclastogenesis by modulating key signaling pathways including NF‑κB/Smad/osterix and β‑catenin/OPG, thereby impacting bone formation and resorption."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": " In this regard, degradation of IFRD1 has been linked to enhanced p65 nuclear translocation in osteoclasts, contributing to the protective effects of therapeutic agents against osteoporosis"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": ", and BMP‑2 signaling in osteoblasts directly induces IFRD1 expression via the Smad pathway."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In epithelial tissues of the gastrointestinal tract, IFRD1 (TIS7) regulates nutrient absorption and metabolic adaptation after injury or resection, thereby influencing lipid uptake and overall energy balance."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": " In colon cancers, elevated IFRD1 expression has been associated with poorer patient survival, suggesting that IFRD1 may also modulate tumor behavior."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Moreover, genetic analyses have implicated IFRD1 variants in human disease susceptibility; a nonsynonymous variant in IFRD1 has been associated with a sensory/motor neuropathy with ataxia"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "14"}]}, {"type": "t", "text": ", and polymorphisms in or near IFRD1 have been linked to alterations in proximal femur shape and increased risk of hip osteoarthritis"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "15"}]}, {"type": "t", "text": ", as well as with nasal polyposis in cystic fibrosis"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "16"}]}, {"type": "t", "text": "and with asthma pathogenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "17"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Finally, the cloning and characterization of human IFRD1 underscore its evolutionary conservation and its regulatory potential during development and cellular differentiation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "18"}]}, {"type": "t", "text": " Collectively, these studies reveal that IFRD1 functions as a versatile modulator of transcription and signaling networks across multiple tissues, where its regulation of NF‑κB and other pathways plays important roles in inflammation, differentiation, and tissue homeostasis"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}, {"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": ", making it a potential therapeutic target in diverse pathologic conditions.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Dmitry E Andreev, Patrick B F O'Connor, Ciara Fahey, et al. 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