There is also an overlap with several spinocerebellar ataxias (SCA1, SCA2, SCA3, SCA12), dentatorubral-pallidoluysian atrophy (DRPLA) and neuroferritinopathy (caused by mutations in the ferritin light chain gene) [4]. This evidence concerns the gene PPP2R2B and dentatorubral-pallidoluysian atrophy.