UASt regulates expression of the short C-terminal isoform (Dp116) of Mmus\Dmd (containing the first exon from the human Dp116 isoform) as described in PMID:16569668. Dp116 contains two spectrins repeats, the ww domain (dystroglycan-binding domain) and a carboxy-terminal domain involved in binding to other DGC proteins like syntrophin and dystrobrevin.
Expressing Mmus\DmdDp116.UAS under the control of Scer\GAL4how-24B has no effect on cardiac function in adult flies.
Expression of Mmus\DmdDp116.Scer\UAS under the control of Scer\GAL4how-24B significantly decreases systolic diameter and significantly increases fractional shortening in both 1 and 5 week old Df(3R)Exel6184/Df(3R)Dl-X43 flies.
Expression of Mmus\DmdDp116.Scer\UAS under the control of Scer\GAL4Hand.PA significantly decreases systolic diameter in 5 week old Df(3R)Exel6184/Df(3R)Dl-X43 flies and significantly increases fractional shortening in both 1 and 5 week old Df(3R)Exel6184/Df(3R)Dl-X43 flies.
Expressing Mmus\DmdDp116.UAS under the control of Scer\GAL4how-24B rescues the increased systolic diameter and reduced fractional shortening of the heart wall in Df(3R)Dl-X43/Df(3R)Exel6184 adult flies.