TMIE (transmembrane inner ear) is an auxiliary subunit of the mechanotransducer (MET) non-specific cation channel complex located at stereocilia tips in cochlear hair cells 1. As a key component of the mechanotransduction machinery, TMIE works alongside pore-forming TMC1/2 subunits and other auxiliary proteins to convert mechanical stimuli into electrochemical signals essential for hearing 1. Functionally, TMIE modulates TMC1/2 channel gating through palmitoylation at its C-terminal cysteine residues, with loss of these palmitoyl groups eliminating its regulatory activity 1. TMIE is critical for inner ear development, as mutations cause autosomal recessive non-syndromic deafness (DFNB6), characterized by hair cell morphological defects including stereocilia abnormalities and failure of auditory function development 2. Zebrafish studies confirm TMIE's evolutionary conservation, showing it is required for vestibular and lateral line hair cell maturation and proper semicircular canal formation 3. Notably, hair cell defects from TMIE inactivation disrupt gene expression in innervating neurons, affecting axonal pathfinding and synaptogenesis—processes essential for establishing peripheral auditory circuitry 4. Gene therapy targeting hair cells restores both hearing and inner ear circuitry in DFNB6 models, suggesting therapeutic potential for this mechanotransduction defect 4.