In the inner ear, may be a component of the hair cell's mechanotransduction machinery that functionally couples PCDH15 to the transduction channel. Regulates transducer channel conductance and is required for fast channel adaptation (By similarity). Found in a complex with TMIE and PCDH15. Interacts with PCDH15; this interaction is required for efficient localization to hair bundles. Interacts with TOMT. Efficient localization to the plasma membrane requires the presence of PCDH15. The disease is caused by variants affecting the gene represented in this entry. Belongs to the LHFP family.