{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMetallothionein 1X (MT1X) is a member of the metallothionein family, proteins known for their roles in metal ion homeostasis, oxidative stress regulation, and modulation of cell survival. In certain pathophysiological settings, genetic variants or polymorphisms in MT1X have been implicated in neurobehavioral traits, as evidenced by its association with disordered gambling, and its 3′‐untranslated region repeat has been successfully employed as a microsatellite instability marker in colorectal cancer screening."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the context of cancer, MT1X functions appear to be multifaceted and tissue dependent. In oral squamous cell carcinoma models, MT1X has been shown to interact with proteins such as TCRP1 and Akt, contributing to cisplatin resistance; siRNA‐mediated knockdown of MT1X enhanced chemosensitivity by promoting apoptosis and impairing cell proliferation. Conversely, in hepatocellular carcinoma, ectopic overexpression of MT1X delayed G1/S cell cycle progression and promoted apoptosis via NF‐κB inactivation, thereby suppressing tumor growth and metastasis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond these cancer models, altered MT1X expression can influence non‐malignant cellular functions. For example, during HIV viremia, increased expression of MT1 isoforms—including MT1X—is associated with enhanced apoptosis resistance in circulating monocytes. In contrast, in keloid fibroblasts, down‐regulation of MT1X is linked with higher proliferative activity, potentially mediated through activation of NF‐κB signaling. In glioblastomas, elevated MT1X expression correlates with higher tumor grade, reduced promoter methylation, and poorer patient survival, underscoring its potential role in tumor aggressiveness and as a prognostic biomarker."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}, {"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn clear cell renal cell carcinoma, MT1X expression correlates positively with advanced tumor stage, higher grade, and worse clinical outcomes. Functional studies in ccRCC cell lines demonstrate that MT1X knockdown suppresses cell proliferation and migration, induces apoptosis, and interferes with hypoxia‐associated signaling pathways, while bioinformatic analyses reveal its association with immune cell infiltration and immunomodulators, highlighting a role in shaping the tumor microenvironment. Additionally, interaction studies show that MT1X binds with partners such as FHL3 to modulate Smad signaling and G2/M phase regulatory proteins, providing further insight into its regulatory influence on cell proliferation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Andrea D Raymond, Bethsebah Gekonge, Malavika S Giri, et al. 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