The inhibition of ASAH1 resulted in reduced \documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{upgreek}\usepackage{mathrsfs}\setlength{\oddsidemargin}{-69pt}\begin{document}$\alpha $\end{document}-synuclein levels in PD-GBA1-derived dopaminergic neurons, supporting a this link between ceramide and PD [69]. This evidence concerns the gene ASAH1 and Parkinson disease.