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Mind‐the‐Gap (MTG) is required for neuronal induction of Drosophila neuromuscular junction (NMJ) postsynaptic domains, including glutamate receptor (GluR) localization. We have previously hypothesized that MTG is secreted from the presynaptic terminal to reside in the synaptic cleft, where it binds glycans to organize the heavily glycosylated, extracellular synaptomatrix required for transsynaptic...
The leonardo gene encodes a conserved member of the 14-3-3 protein family, which plays a role in Drosophila learning. Immunological localization of the protein shows that it is expressed at synaptic connections and enriched in presynaptic boutons of the neuromuscular junction (NMJ). Null leonardo mutants die as mature embryos. Electrophysiological assays of the mutant NMJ demonstrate that basal synaptic...
We describe the extent to which presynaptic structures at the embryonic neuromuscular junction of Drosophila can form in mutants where development of postsynaptic somatic muscles is affected. Although twist mutant embryos lack mesoderm, motor axons still grow out of the CNS and form morphologically normal presynaptic active zones, independent of their target cells. In myoblast city mutant embryos,...
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