Also, two genes involved in familial forms of PD, namely PINK1 (PTEN-induced putative kinase 1) and PRKN (Parkin RBR E3 Ubiquitin Protein Ligase also named PARK2 or Parkin) were shown to regulate the presentation of mitochondria-derived antigens in the context of MHC class I molecules (20). Here, PINK1 is linked to Parkinson disease.