TBC1D24 Mutations in a Sibship with Multifocal Polymyoclonus

Background:  Advances in molecular genetic technologies have improved our understanding of genetic causes of rare neurological disorders with features of myoclonus. Case Report:  A family with two affected siblings, presenting with multifocal polymyoclonus and neurodevelopmental delay, was recruited for whole-exome sequencing following unyielding diagnostic neurometabolic investigations. Compound heterozygous mutations in  TBC1D24 , a gene previously associated with various epilepsy phenotypes and hearing loss, were identified in both siblings. The mutations included a missense change c.457G>A (p.Glu157Lys), and a novel frameshift mutation c.545del (p.Thr182Serfs*6). Discussion:  We propose that  TBC1D24- related diseases should be in the differential diagnosis for children with polymyoclonus.