LRRK2 and Platelet storage pool disease: The LRRK2 G2019S mutation represents the most common genetic cause of familial PD (fPD) and can also be found in sporadic PD (sPD) patients (~2%) due to reduced penetrance of the mutation (Nichols et al., 2005; Zimprich et al., 2004; Schiesling et al., 2008).