Golden Goal Collaborates with Flamingo in Conferring Synaptic-Layer Specificity in the Visual System
Résumé
Neuronal connections are often organized in layers, which contain synapses between neurons that have similar functions. In Drosophila, R7 and R8 photoreceptors, which detect different wavelengths, form synapses in distinct medulla layers. The mechanisms underlying the specificity of synaptic-layer selection remain unclear. We found that Golden Goal (Gogo) and Flamingo (Fmi), two cell-surface proteins involved in photoreceptor targeting, functionally interact in R8s. Our genetic studies indicated that Gogo promotes R8 adhesion to the temporary layer M1, whereas Gogo and Fmi collaborate to mediate axon targeting to the final layer M3. Structure-function analysis suggests that Gogo and Fmi interact with intracellular components through the Gogo cytoplasmic domain. Moreover, Fmi is also required in a subset of target cells for R8 axon targeting. We propose that Gogo acts as a functional partner of Fmi for R8 axon targeting and that the dynamic regulation of their interaction specifies synaptic-layer selection of photoreceptors.
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