ATP13A2 silencing alters the circadian defect of flies expressing mutant α-syn. Locomotor activity and anticipation of the dark–light transition of young (0–3-day-old) and old (30-day-old) flies expressing WT, A30P, and A53Tα-syn with and without ATP13A2 silencing were studied using a Drosophila activity monitor (DAM) (A) and the corresponding Eduction graph is presented (B). Dark (12 h) and light (12 h) phases were indicated as D and L, respectively. Group activity (counts/min) was also shown. A30P and A53T flies (young and old) showed defective evening light expectancy, as indicated by * (A,B).