CLIC5 (chloride intracellular channel 5) is a metamorphic protein that functions as both a soluble cytoplasmic factor and a membrane-integrated ion channel. In its soluble state, CLIC5 catalyzes glutaredoxin-like thiol disulfide exchange reactions, while its membrane-inserted form creates non-selective ion channels permeable to Na+, K+, and Cl- 1. CLIC5 is essential for hearing, required for stereocilia formation in the inner ear and proper organ of Corti development 1. It interacts with GRXCR2 and TPRN to form structural rings in the stereociliary taper region critical for mechanotransduction and auditory perception 23. CLIC5 also maintains glomerular endothelial cell and podocyte architecture, suggesting roles in renal filtration. Mutations in CLIC5 cause autosomal recessive deafness (DFNB103) 1. Beyond sensory function, CLIC5 emerges as a prognostic marker in cancer biology. Genetic association studies identify CLIC5 as a risk locus for primary open-angle glaucoma 4. In lung adenocarcinoma and ovarian cancer, reduced CLIC5 expression correlates with improved survival and altered immune cell infiltration patterns 56. AAV-mediated gene therapy successfully restores CLIC5 function and auditory outcomes in animal models, establishing therapeutic potential for hereditary deafness 1.