Genomic fragment that encompasses the cyst gene and includes its promoter (derived from the BACR27M12 BACPAC clone). A S320E amino acid replacement (phosphomimetic mutation) has been introduced into the coding sequence. Silent mutations have been introduced at two distinct sites to confer resistance to RNAi mediated by the P{TRiP.HMS01750} transgene. A sfGFP tag followed by a S(GGGGS)[[2]] linker has been inserted at the N-terminal end of the coding sequence.
Maternal expression of cystHMS01750 under the control of Scer\GAL4VP16.mat.αTub67C leads to embryonic lethality, which can be rescued by cystR.S320E.N-sfGFP.