PRKN and Parkinson disease: Next, we investigated whether the same findings of defective PINK1‐PRKN‐mediated mitophagy in the fibroblast cell line from a patient with EPG5‐parkinsonism are found in fibroblast cell lines from patients with milder EPG5‐related disorders at earlier ages and without parkinsonism at time of biopsy (p.Gln336Arg and p.Arg1621Gln).