FGF8 and hearing loss disorder: In KS, according to the presence of certain accompanying clinical features, genetic screening for particular gene(s) may be prioritized, for example if the patient has synkinesia then KAL1 would be suggested, dental agenesis is associated with FGF8/FGFR1, digital bony abnormalities also with FGF8/FGFR1 and hearing loss with CHD7 and SOX10.