This invention provides drugs and methods for preventing or reversing
hearing loss. [Solution] A composition comprising at least two different
nucleic acid vectors, each of which comprises a coding sequence encoding a different portion of the otoferrin
protein, and the use of these compositions for treating
hearing loss in a subject are provided herein. This disclosure is based on the discovery that a composition comprising at least two different
nucleic acid vectors, each of which comprises a coding sequence encoding a different portion of the otoferrin
protein, can be used to generate a sequence encoding an active otoferrin
protein (e.g., full-length otoferrin protein) in mammalian cells, thereby enabling the treatment of
asymptomatic sensorineural hearing loss in a subject in need.