UASp regulatory sequences drive expression of the second ORF of Sxl, tagged with Tag:HA at the NheI restriction enzyme site (2245). This construct has the bru1-response elements (BREs) removed through the excision of a fragment between NheI (2245) and NheI (3379) restriction site enzymes.
Ovarian expression of SxlMS11.δBRE.Scer\UASp.T:Ivir\HA1 under the control of Scer\GAL4nos.PG leads to all germaria filling with overproliferating cysts that contain many branched fusomes. In addition, fusomes are present in pseudo egg chambers.
This construct produces tagged Sxl MS11 RNA with an intact 3'UTR.