Many of the midgut intestinal stem cells (ISCs) in flies expressing Atac2Scer\UAS.cMa under the control of Scer\GAL4esg-NP5130 (co-expressed with Avic\GFPScer\UAS.cUa, and restricted to two days post-eclosion using Scer\GAL80ts.αTub84B) are surrounded by patches of differentiated enteroendocrine and enterocyte cells that still retain some GFP expression. Three days after the temperature switch the number of mitotic cells (seen using PH3) is increased compared to controls, but has reduced to wild type levels by five days.
Midgut clones expressing Atac2Scer\UAS.cMa under the control of Scer\GAL4esg-NP5130 still contain ISCs 10 days after induction, indicating that survival is not affected. However the clones contain an increased number of cells, having on average of 5.5 cells compared to 3.1 in controls.
Expression of Atac2Scer\UAS.cMa rescues the increase in the number and size of midgut intestinal stem cell (ISC) clusters seen in flies expressing both Atac2GD6972 and Avic\GFPScer\UAS.cUa under the control of Scer\GAL4esg-NP5130. The ISCs are surrounded by differentiated enteroendocrine cells and enterocytes that retain some GFP expression.