CCNO and Conductive hearing impairment: Variants in CCDC114 cause sensorineural hearing loss (SNHL) (Li et al., 2019), while variants in CCNO, CDH3, DNAH5 and OFD1 cause conductive hearing loss (CHL) (Bukowy-Bieryllo et al., 2019; Fan et al., 2019; Henriques et al., 2021; Wang et al., 2021; Yang et al., 2022).