{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRAF1 is a serine‐threonine kinase that plays a critical role in the RAS–MAPK signaling cascade, and its dysregulation is implicated in developmental disorders. Gain‐of‐function missense mutations in RAF1 have been shown to enhance MEK–ERK activation, leading to aberrant cardiomyocyte growth and hypertrophic cardiomyopathy in patients with Noonan and LEOPARD syndromes, as demonstrated by studies in patient cohorts and model organisms. These findings underscore its importance in regulating normal cardiac development, with mutation‐induced relief of autoinhibition being a key pathogenic mechanism."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n \nRAF1 also exerts central functions in modulating immune responses. In human dendritic cells, activation of pathogen‐recognition receptors such as DC‐SIGN and dectin‐1 triggers RAF1 activity that subsequently modifies NF‑κB signaling (for example, via p65 acetylation or sequestration of RelB), thereby fine‐tuning the balance between pro‑ and anti‑inflammatory cytokine production. These studies highlight the ability of RAF1 to integrate signals from diverse pathogen receptors to shape adaptive immune responses."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "3", "end_ref": "5"}]}, {"type": "t", "text": "\n \nIn the context of oncogenesis, RAF1 contributes to tumor progression through multiple mechanisms. Aberrant activation of RAF1—whether by upregulation due to circular RNA–mediated miRNA sponging in colorectal cancer, gene amplification leading to enhanced ERK–β‐catenin signaling in breast tumor–initiating cells, or oncogenic fusions as seen in pilocytic astrocytomas—is associated with increased cell proliferation, survival and migration. Moreover, in non‐small cell lung cancer and melanomas with RAS mutations, RAF1 (also known as CRAF) is essential for transmitting oncogenic signals, and its deregulated activity can stem from altered interactions with cell cycle regulators or loss of negative control by microRNAs. Collectively, these data position RAF1 as a key effector and potential therapeutic target in diverse cancers."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "16"}]}, {"type": "t", "text": "\n \nRAF1 furthermore influences cell survival and cell cycle progression by acting as a nodal regulator of both anti‑apoptotic and proliferative signals. In endothelial cells, distinct modes of RAF1 activation—via PAK1 or Src—initiate protective responses against intrinsic and extrinsic apoptotic triggers. In other systems, its direct interaction with pro‑survival or cell cycle proteins such as MST2 and Rb underscores its ability to restrain apoptosis or promote cell cycle entry; for example, binding of RAF1 to Rb facilitates the dissociation of chromatin remodeling factors, thereby linking mitogenic signals directly to cell cycle progression. In addition, regulatory proteins (including GILZ and IAPs) modulate RAF1 activation and turnover, further influencing downstream MEK–ERK signaling and cellular fate."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "17", "end_ref": "26"}]}, {"type": "t", "text": "\n \nTightly regulated by multiple layers of control, RAF1 activity is modulated by both positive and negative signals. Structural studies reveal that RAF1 (commonly referred to as C‑RAF) participates in heterodimer formation with other RAF isoforms (e.g. B‑RAF) in a process governed by phosphorylation/dephosphorylation events, interactions with 14–3–3 proteins, and spatial sequestration by anchoring proteins like RKTG. Moreover, negative regulators such as Sprouty4 and post‑translational modifications including arginine methylation contribute to the dynamic adjustment of RAF1 activity and stability—mechanisms that are essential not only for directing appropriate mitogenic responses but also for functions such as herpesvirus reactivation. Thus, complex regulatory networks ensure that RAF1 mediates cellular signaling with high fidelity under both physiological and pathological conditions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "27", "end_ref": "36"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Bhaswati Pandit, Anna Sarkozy, Len A Pennacchio, et al. 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