icsG4 homozygotes display wing blisters. icsG4/icsG4 flies are more resistant to ethanol-induced sedation than icsG4/+ or wild type flies, but have normal ethanol absorption and metabolism and show normal locomotion. icsG4/Df(2L)BSC147 flies are more resistant to ethanol-induced sedation than Df(2L)BSC147/+ flies.
icsG4/icsG4 flies show a significant naive preference for ethanol, consuming more liquid food with ethanol on day 1 and 2 (and amounts consumed remain unchanged across 4 days) compared to controls (wild type flies gradually acquire a preference for ethanol over 3 days); total food consumption is not significantly different in mutants and controls.
icsG4 has chemical resistant | adult stage phenotype, suppressible by Rac1DN.UAS.cUa/Scer\GAL4ics-G4
icsG4 has chemical resistant | adult stage phenotype, non-suppressible by mysts2/mys[+]
icsG4/icsG4 is a suppressor of chemical sensitive | adult stage phenotype of mysts2
icsG4/icsG4 is a non-suppressor of chemical sensitive | adult stage phenotype of Rac1DN.UAS.cUa, Scer\GAL4ics-G4
mysts2/+;icsG4/icsG4 flies have the same increased resistance to ethanol-induced sedation seen in icsG4/icsG4 mutants alone, unlike ethanol-sensitive mysts2/+ flies.
Scer\GAL4ics-G4>Rac1DN.Scer\UAS.cUa;icsG4/icsG4 flies have the same increased sensitivity to ethanol-induced sedation seen in Scer\GAL4ics-G4>Rac1DN.Scer\UAS.cUa flies, unlike ethanol-resistant icsG4/icsG4 flies.
icsG4/Df(2L)BSC147 is rescued by Scer\GAL4ics-G4/icsUAS.cOa
icsG4 is rescued by Scer\GAL4ics-G4/icsUAS.cOa
icsG4 is partially rescued by Scer\GAL80Mef2.mb247/Scer\GAL4ics-G4/icsUAS.cOa
icsG4 is not rescued by Scer\GAL4ics-G4/Scer\GAL80elav.PY/icsUAS.cOa
Expression of icsScer\UAS.cOa driven by Scer\GAL4ics-G4 rescues resistance to ethanol-induced sedation in icsG4/icsG4 (or icsG4/Df(2L)BSC147) flies to control levels; there is no rescue when Scer\GAL80elav.PY (to suppress neuronal ics expression) is also present. Expression of icsScer\UAS.cOa driven by Scer\GAL4ics-G4 also restores ethanol consumption behavior in icsG4/icsG4 flies to wild type levels.
Expression of icsScer\UAS.cOa driven by Scer\GAL4ics-G4 (using Scer\GAL80ts.αTub84B to control timing of expression) during adulthood alone (but not throughout development) rescues resistance to ethanol-induced sedation in icsG4/icsG4 flies to control levels.
Expression of icsScer\UAS.cOa driven by Scer\GAL4ics-G4 restores ethanol consumption behavior in icsG4/icsG4 flies to wild type levels; flies with additional presence of Scer\GAL80Mef2.mb247 (to suppress ics expression in the mushroom bodies) show normal naive ethanol preference and normal resistance to ethanol-induced sedation, but unlike wild type do not acquire a preference for ethanol over 4 days.
Precise excision of the P{GawB} insertion reverts the mutant phenotype.