Overexpression of DrScer\UAS.cIa, under the regulation of Scer\GAL4ap-md544 in pharate adults results in reduced and crumpled wings, and a reduced notum. However, no hinge-like sensory organs or other structures could be discerned in the latter. Overexpression of DrScer\UAS.cIa, under the regulation of Scer\GAL4ap-md544 in the whole dorsal compartment of the disc at 17oC reduces the size of the notum territory. At 25oC, it strongly inhibits the development of this territory and individuals die at the pupal stages.
When DrScer\UAS.cIa is driven by Scer\GAL4how-24B alterations are seen both dorsal muscle and heart cell populations. The number of heart cells is dramatically reduced. The majority of pericardial cells and about 70% of cardioblasts are lacking. The majority of eve expressing DA1 muscle precursors are substituted by supernumerary DO1 muscles.
The anterior wing margin differentiates dorsal-type bristles arranged in a dorsal-like pattern on both surfaces in flies expressing DrScer\UAS.cIa under the control of Scer\GAL4C-765. The pattern of the vein L3 is symmetric, with a dorsal corrugation pattern on both surfaces. Few bristles are seen on the ventral surface of the alula, suggesting transformation to a dorsal fate. Expression of DrScer\UAS.cIa under the control of Scer\GAL4ap-md544 reduces the size of the dorsal wing pouch and induces differentiation of ectopic bristles in the wing blade. Vein differentiation is also affected.
The segmental border muscles are absent and the number of Kr-expressing muscles increases in embryos expressing DrScer\UAS.cIa under the control of Scer\GAL4how-24B.
Scer\GAL4how-24B-mediated expression severely alters muscle morphology, muscle may be completely missing or exhibit abnormal shape and orientation. Less severe phenotype is seen in the dorsal region, muscles are thicker than normal and occasionally contain additional muscles. Ventral internal muscles are also disorganised. Lateral transverse muscles form normally but their morphology is somewhat irregular. Ectopic Dr expression interferes with the correct specification of the progenitors/founders.
Produces severe disruptions of the axon tracts in embryos, when expressed using Scer\GAL4sca-537.4; the commissures are almost completely absent and the longitudinal connectives are broken and interrupted. Gaps are often seen along the midline in these embryos. The aCC, pCC, CQ, fpCC and RP2 neurons fail to differentiate.