SYNJ1 and Parkinson disease: Other genes, such as those coding for the ATPase Cation Transporting 13A2 (ATP13A2), the Phospholipase A2 Group VI (PLA2G6), the F-Box Protein 7 (FBXO7), HSP40 Auxilin (DNAJC6) and the Synaptojanin-1 (SYNJ1), have been related to atypical PD with juvenile onset (age at onset <35 years old) [4].