There is no difference in τ values in Syt1AD4/Syt1N13; Syt1Scer\UAS.cMa Scer\GAL4elav.PLu flies in response to a 50Hz, 10s stimulus.
The Ca2+ dependence of neurotransmitter release in larvae expressing sytB-D3.4N.Scer\UAS under the control of Scer\GAL4elav.PLu in a sytAD4 background is significantly shifted compared to the Ca2+ dependence of neurotransmitter release in larvae expressing sytScer\UAS.cMa under the control of Scer\GAL4elav.PLu in a sytAD4 background.
Syt1UAS.cMa/Scer\GAL4elav.PLu partially rescues Syt1AD4
Expression of sytScer\UAS.cMa under the control of Scer\GAL4elav.PLu rescues the lethality of sytAD4 flies; 85 +/- 6% of the expected number survive. The rescued adults are slightly uncoordinated. sytAD4 homozygous larvae which are also expressing sytScer\UAS.cMa under the control of Scer\GAL4elav.PLu have a mean excitatory junction potential (EJP) amplitude at the neuromuscular junction which is 67% of that of control larvae. The frequency of spontaneous miniature EJPs (mEJPs) in these larvae is slightly increased compared to controls (the difference is not statistically significant). The distribution of quantal sizes and the mean quantal size of the mEJPs is not different from controls. The mean excitatory junction potential (EJP) amplitude at the neuromuscular junction of sytAD4 homozygous larvae which are also expressing sytKQ.Scer\UAS under the control of Scer\GAL4elav.PLu is significantly reduced compared to the mean EJP amplitude of sytAD4 homozygous larvae which are also expressing sytScer\UAS.cMa under the control of Scer\GAL4elav.PLu. The mean miniature EJP (mEJP) amplitude at the neuromuscular junction of sytAD4 homozygous larvae which are also expressing sytKQ.Scer\UAS under the control of Scer\GAL4elav.PLu is not significantly different from the mean mEJP amplitude of sytAD4 homozygous larvae which are also expressing sytScer\UAS.cMa under the control of Scer\GAL4elav.PLu. The mean mEJP frequency at the neuromuscular junction of sytAD4 homozygous larvae which are also expressing sytKQ.Scer\UAS under the control of Scer\GAL4elav.PLu is approximately twice that of sytAD4 homozygous larvae which are also expressing sytScer\UAS.cMa under the control of Scer\GAL4elav.PLu.