Haploinsufficiency of the ATP6V1B2, a subunit of V-ATPases, underlies genetic disorders including Dominant deafness-onychodystrophy (DDOD), deafness, onychodystrophy, osteodystrophy, mental retardation and seizures (DOORS), and Zimmermann-Laband syndromes, all characterized by congenital hearing loss and onychodystrophy. Effective therapies for ATP6V1B2-associated hearing loss remain elusive. The study generates a hair cell-specific knockout mouse (Atp6v1b2