In Waisman syndrome, disruption of the 3′ UTR of fibroblast growth factor 20 (FGF20) by a mutation alters the recognition site of mir-433, which results in increased translation of FGF20 and is correlated with increased alpha-synuclein expression (Dostie et al., 2003; Wang et al., 2008; Harraz et al., 2011). Here, FGF20 is linked to Early-onset parkinsonism - intellectual disability.