The partial lethality, reduced climbing ability and survival rates under nutrient-limiting conditions of the surviving adults as well as the failure to activate autophagy upon starvation (assessed by Lysotracker staining in larval fat body) characteristic for Nprl21 homozygotes is rescued by expression of Nprl2Scer\UAS.P\T.T:Zzzz\FLAG,T:Ivir\HA1 under the control of Scer\GAL4da.G32 in the mutant background.