{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n CLXN (calaxin) is a calcium‐binding protein that functions as a regulator linking Ca²⁺ signaling to the activity of motor proteins. Initially characterized for its role in modulating the beat of sperm flagella through Ca²⁺‐dependent regulation of dynein activity"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ", CLXN serves as a molecular sensor that translates fluctuations in intracellular Ca²⁺ into alterations in motility. Although its best‐known function is in the control and timing of flagellar or ciliary motion, similar EF‐hand calcium‐binding proteins have been implicated in broader cellular processes. For example, dysregulation of related Ca²⁺‐binding molecules has been associated with oncogenic processes in breast cancer and lung adenocarcinoma, where altered expression can promote proliferation, migration, and invasion."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " Likewise, epigenetic studies have identified aberrant methylation signatures affecting such calcium signaling components across multiple tumor types, reinforcing the importance of Ca²⁺‐regulated pathways in cell differentiation, tissue organization, and disease progression."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In summary, CLXN (calaxin) acts as a pivotal Ca²⁺ sensor that modulates motor protein function and thereby influences cellular motility. Its activity exemplifies how calcium‐dependent regulation of the cytoskeleton can be harnessed both in normal physiological events such as the control of flagellar beat, and in pathological conditions where disruption of such signaling may contribute to cancer progression and other disease states.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Keita Sasaki, Kogiku Shiba, Akihiro Nakamura, et al. 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