{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Calmin (CLMN) encodes a transmembrane protein containing tandem calponin‐homology domains that is emerging as a multifunctional player in diverse cellular processes. Genome‐wide association studies have identified polymorphisms within CLMN that are significantly associated with statin‐mediated lipid responses, suggesting a role in cholesterol regulation and metabolic homeostasis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In kidney collecting duct cells, CLMN functions as one of two integral membrane proteins that link filamentous actin to the apical plasma membrane. This association contributes to vasopressin‐induced reorganization of the actin network and efficient trafficking of aquaporin‑2, thereby modulating water permeability."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In the context of cancer, studies in breast invasive carcinoma have demonstrated that CLMN mRNA expression is down‐regulated relative to normal tissues, with higher expression levels correlating with improved patient survival, which suggests a tumor‐suppressive function. Moreover, CLMN is a component of a vitamin D–responsive gene signature in breast tissue, further underscoring its relevance in breast cancer biology."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In neural systems, CLMN is robustly induced by all‑trans retinoic acid (atRA) in neuroblastoma cells, where it promotes cell cycle exit and neurite outgrowth. Additional developmental studies document CLMN expression in maturing neurons of the brain and in the neuroepithelium, indicating an important role in neuronal differentiation and maturation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "9"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n From an evolutionary perspective, calmin is related to the nesprin family of cytoskeletal linker proteins. Its tandem calponin‑homology domains and conserved structural features support a role in tethering the actin cytoskeleton to membrane‐associated complexes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Finally, aberrant regulation of CLMN has also been observed in nasopharyngeal carcinoma, where it is proposed as a candidate tumor suppressor, and in the context of mutant p53‐dependent transcriptional reprogramming, linking it to altered cellular differentiation and metabolism."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Collectively, these findings highlight the multifaceted roles of CLMN in cytoskeletal organization, lipid metabolism, neuronal differentiation, and tumor biology. Further mechanistic studies are warranted to elucidate its molecular functions and therapeutic potential.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Mathew J Barber, Lara M Mangravite, Craig L Hyde, et al. 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