Mechano-electrical transducer channel (MET channel)

The mechano-electrical transducer (MET) channel is a specialized ion channel complex located at the tips of the stereocilia in the inner ear's hair cells. It is primarily composed of the pore-forming subunits Transmembrane channel-like protein 1 (TMC1) and TMC2, which convert mechanical sound vibrations and head movements into electrical signals transmitted to the brain [1][2]. Proper functioning of this channel is essential for the senses of hearing and balance, and mutations in the genes encoding these proteins are leading causes of hereditary sensorineural deafness [3][4]. While the channel is a notorious site of entry for ototoxic drugs such as aminoglycoside antibiotics and cisplatin, which cause permanent hair cell damage, it has recently emerged as a primary target for regenerative medicine [5]. Current drug development efforts focus on gene therapy and CRISPR-based editing to restore MET channel function in patients with genetic hearing loss [6][7]. Understanding the biophysical properties of the MET channel is critical for designing therapies that can selectively modulate sensory input without causing cellular toxicity.

Other names

Hair cell mechanotransduction channelTransmembrane channel-like protein 1/2 complexTMC1/TMC2 complexSensory mechanotransduction channel

Experimental therapies focus on gene replacement or gene editing to restore functional TMC1 protein expression in hair cells. Small molecules and aminoglycosides act as permeant blockers or pore-cloggers, often leading to ototoxicity through intracellular accumulation.