NUS1 and Parkinson disease: Further studies involving NUS1 variants in familial PD, particularly in EOPD, using high-coverage next-generation sequencing, and throughout functional studies in main pathobiological pathways underpinning PD (3), including autophagy, endocytosis, mitochondrial biology, immune response, and lysosomal function, are warranted to expose the real role of the NUS1 gene in PD development.