COQ4 and cerebellar ataxia: Mero et al. [58] reported two patients each with two COQ4 mutations ([c.577C>T] [p. Pro193Ser] and [c.718C>T] [p.Arg240Cys], and [c.284G>A] [p.Gly95Asp] and [c.305G>A] [p.Arg102], respectively), presenting with motor impairment and ataxia.