Component of the ESCRT-I complex, a regulator of vesicular trafficking process. Component of the ESCRT-I complex (endosomal sorting complex required for transport I). Death at the transition from the first to second instar. Morphological changes in MVBs and developmental defects in the compound eye. However, for the ligands and receptors tested, changes in their cell surface levels or their delivery to lysosomes have not been detected. In early embryos and during sperm individualization defects in actin cytoskeleton organization ocurr. Belongs to the VPS28 family.