RAB3GAP1 and Micro syndrome: Warburg Micro Syndrome (WARBM, ORPHA: 2510), also known as Micro Syndrome, is a RD caused by mutations in RAB3GAP1 (Morris-Rosendahl et al. 2010) (Tasdemir et al. 2015) and TBC1D20 (Liegel et al. 2013) genes.