4kb genomic fragment encompassing the Act88F gene (includes approximately 1420bp of 5' flanking sequence and approximately 400bp of 3' flanking sequence). A E334K amino acid replacement has been introduced into the coding sequence.
Act88F6 null flies homozygous for Act88FE334K insert have almost normal flight ability, flies carrying one mutant copy are flightless. Indirect flight muscles in Act88F6 homozygous for Act88FE334K insert appear to form filaments that lack Z discs.
IFM myofibrils are studied in transformant Act88F6 mutants. Mutants produce aberrant myofibrils.
Act88FE334K partially rescues Act88F6