{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nNFIX is a member of the Nuclear Factor I family of transcription factors that plays a pivotal role in embryonic and postnatal development. Alterations in NFIX—including deletions, missense mutations, frameshift and splice‐site variants, as well as copy number changes—are causally linked to a spectrum of congenital disorders such as Sotos‐like overgrowth, Marshall–Smith syndrome, and Malan syndrome. These syndromes are characterized by variable features including macrocephaly, advanced or dysregulated bone maturation, craniofacial dysmorphism, and intellectual disability, underscoring the essential role of NFIX in brain development, skeletogenesis, and stem cell regulation. Furthermore, emerging evidence highlights that NFIX dosage and the timing of its expression are critical, as exemplified by cases where microduplications produce phenotypes that are “reversed” relative to loss‐of‐function variants, and by its contribution to the regulation of proliferation and differentiation in multiple organ systems."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nSplice variants of NFIX, such as the newly identified NFI‐X3, regulate the expression of astrocyte‐specific and glial markers including glial fibrillary acidic protein and YKL–40. In this manner, NFIX coordinates key steps in neural progenitor differentiation, astrocyte migration, and gliogenesis. NFIX cooperates with other transcriptional regulators like STAT3 and activator protein 1 to facilitate chromatin remodeling and activate target gene transcription during later stages of central nervous system development."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the context of oncogenesis, NFIX exhibits complex and context‐dependent roles. In several cancers—including ovarian, esophageal, lung, and glioblastoma—NFIX expression is modulated by distinct microRNAs (for example, miR‑744‑5p, miR‑1290, and miR‑762) that affect apoptotic pathways, cell cycle progression, and metastatic behavior. NFIX can directly transactivate key downstream targets such as GINS1 to promote glioblastoma cell proliferation, and its dysregulation in lung adenocarcinoma is associated with adverse outcomes. These findings illustrate how NFIX serves as a central node linking developmental programs to tumor progression and chemoresistance."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "14", "end_ref": "20"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its conventional role as a transcription factor, alternate RNA species derived from the NFIX locus have emerged as significant regulators in disease pathogenesis. Circular RNAs encoding NFIX (circNFIX) are implicated in promoting glioma progression, ovarian cancer immune escape, and the maintenance of stemness properties by acting as molecular sponges (e.g., recruiting LIN28B to enhance downstream target stability). Additionally, NFIX is involved in viral gene regulation; it modulates the transcription of the JC polyomavirus through protein–protein interactions with factors like c‑Jun. Its dysregulation also extends to inflammatory conditions, as alterations in the miR‑762/NFIX axis can influence NF‑κB/IRF3 signaling and cytokine release in acute lung injury, while circNFIX has been shown to affect chondrogenesis and cartilage homeostasis in osteoarthritis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "21", "end_ref": "28"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Valérie Malan, Diana Rajan, Sophie Thomas, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Distinct effects of allelic NFIX mutations on nonsense-mediated mRNA decay engender either a Sotos-like or a Marshall-Smith syndrome."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Am J Hum Genet (2010)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.ajhg.2010.07.001"}], "href": "https://doi.org/10.1016/j.ajhg.2010.07.001"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "20673863"}], "href": "https://pubmed.ncbi.nlm.nih.gov/20673863"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Yuriko Yoneda, Hirotomo Saitsu, Mayumi Touyama, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Missense mutations in the DNA-binding/dimerization domain of NFIX cause Sotos-like features."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Hum Genet (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/jhg.2012.7"}], "href": "https://doi.org/10.1038/jhg.2012.7"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "22301465"}], "href": "https://pubmed.ncbi.nlm.nih.gov/22301465"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Merel Klaassens, Deborah Morrogh, Elisabeth M Rosser, et al. 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