Genetic variations in the tau gene MAPT also increase the risk of PSP, frontotemporal dementia, Parkinson disease (PD) (Martin et al., 2001, Satake et al., 2009, Simón-Sánchez et al., 2009), and dementia in PD (Goris et al., 2007). Here, MAPT is linked to frontotemporal dementia.