PARK7 and Parkinson disease: In recent years, a number of biochemical molecules, such as α-synuclein, DJ-1, tau, etc., in cerebrospinal fluid (CSF) and blood have been studied as potential biomarkers of PD (Hong et al., 2010; Waragai et al., 2010), (Mollenhauer et al., 2006; Waragai et al., 2007).