All Drosophila stocks and crosses were fed with malt and semolina-based food with 12 h light and dark daily rhythms at 25°C with 60% humidity, unless mentioned otherwise. Drosophila strains used in this study were UAS-daRNAi GD51297 and UAS-daRNAi KK105258 from the Vienna Drosophila Resource Center, CantonS (a gift from Dr Bertram Gerber, Leibniz Institute for Neurobiology, Magdeburg, Germany), daG32-Gal4 (a gift from Riitta Lindström, University of Helsinki, Helsinki, Finland), UAS-TCF4B (Tamberg et al., 2015 (link)), 201Y-Gal4 [Bloomington Drosophila Stock Center (BDSC, 4440)], 30Y-Gal4 (BDSC, 30818) (Yao Yang et al., 1995 (link)) and OK107-Gal4 (BDSC, 854) were gifts from Mark Fortini, Thomas Jefferson University, Philadelphia, PA, USA. R12B08-Gal4 (BDSC, 48489) (Pfeiffer et al., 2008 (link), flweb.janelia.org/cgi-bin/view_flew_imagery.cgi?line=R12B08), elav-Gal4 (BDSC, 8760) (Luo et al., 1994 (link)), UAS-Dcr2;Pin1/CyO (BDSC, 24644) (Dietzl et al., 2007 (link)), UAS-nls-GFP (BDSC, 4776), UAS-daG (BDSC, 37291), UAS-mCD8-GFP; Pin1/CyO (BDSC, 5136) and da mutant line da10 (BDSC, 5531) (Caudy et al., 1988 (link)) were obtained from the BDSC. The following transgenic lines were generated in this study: 3xFLAG-da2M4 and sfGFP-da4M1.
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