Scer\GAL4Mef2.PU-mediated expression results in a progressive, age-dependent loss of flight resulting in a penetrant flightless phenotype at 30 days post eclosion. Indirect flight muscle myofibril structure shows marked defects in integrity and sarcomere organization.
The lack of a Scer\GAL4tub.PU-mediated viability phenotype is a false negative (compared to independent viability data from miRNA deletion mutants).