TBC1D24 and nonsyndromic deafness: The gene TBC1D24 is involved in regulation of synaptic vesicle trafficking and in brain and somatic development.1, –, 5 It has recently been implicated in various human diseases, many of which feature epileptic seizures1,3,6, –, 14; mutations can also cause nonsyndromic deafness.15, –, 18