COL9A3 and hearing loss disorder: Mutations in other collagen genes, for example COL2A1, COL4A3, COL4A4, COL4A5, COL4A6, COL9A1, COL9A2 and COL9A3, COL11A1, and/or COL11A2 have been associated with hereditary hearing loss (https://hereditaryhearingloss.org/).