A truncated form of C3G (lacking amino acids 1145 to 1383, the CDC25-homologous domain) tagged with 6 copies of the Tag:MYC tag is expressed under the control of UASt regulatory sequences. The C3G sequences are also tagged at the 5' end with Tag:M(c-SRC), to produce a membrane-targetted protein.
C3GΔ.Scer\UAS.T:Hsap\MYC,T:Ggal\Myr3 driven by Scer\GAL4Mef2.PR results in viable flies with no obvious changes in actin organisation.
Flies expressing at least two copies of C3GΔ.Scer\UAS.T:Hsap\MYC,T:Ggal\Myr3 under the control of Scer\GAL4GMR.PF have a severe eye phenotype. The eye is much reduced in size and is often tear-shaped (indicating that the development of the ventral part of the eye is more strongly affected than the dorsal part). Lens facets are formed, but bristles are completely absent from the eye surface. There is a reasonably well formed pigment cell lattice surrounding the ommatidia, but the number of photoreceptor cells per ommatidium is often reduced by 1 or 2 cells. The orientation of the ommatidia is random. The third vein fails to reach the wing margin in flies expressing C3GΔ.Scer\UAS.T:Hsap\MYC,T:Ggal\Myr3 under the control of Scer\GAL4dpp.blk1 and the anterior crossvein is missing.