The lysosome expansion phenotype observed in somatic muscles of FIG4Δ1 homozygous third instar larvae is fully or partially rescued by expression of any of the following: FIG4Scer\UAS.T:Hsap\MYC, FIG4I41T.Scer\UAS.T:Hsap\MYC, FIG4L17P.Scer\UAS.T:Hsap\MYC, FIG4D53Y.Scer\UAS.T:Hsap\MYC or FIG4C450S.Scer\UAS.T:Hsap\MYC under the control of Scer\GAL4Mef2.PU in the mutant background.