Expression of rab3-GAPScer\UAS.T:Avic\GFP-YFP.Venus under the control of Scer\GAL4elav-C155 in a wild-type background does not affect synaptic homeostasis although there is a slight, statistically significant decrease in evoked neurotransmitter release.
A homeostatic increase in presynaptic quantal content is observed following application of PhTX to rab3-GAPc04953 mutants expressing rab3-GAPScer\UAS.T:Avic\GFP-YFP.Venus pre-synaptically under the control of Scer\GAL4elav-C155. The observed increase in quantal content offsets the PhTX-dependent decrease in mEPSP amplitude and restores EPSP amplitudes to baseline values.