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A novel sex difference in Drosophila contact chemosensory neurons unveiled using single cell labeling.
Journal of Neurogenetics 2018 November 21
Among the sensory modalities involved in controlling mating behavior in Drosophila melanogaster, contact sex pheromones play a primary role. The key receptor neurons for contact sex pheromones are located on the forelegs, which are activated in males upon touching the female abdomen during tapping events in courtship actions. A fruitless (fru)-positive (fru [+]) male-pheromone sensing cell (M-cell) and a fru [+] female-pheromone sensing cell (F-cell) are paired in a sensory bristle on the legs, and some fru [+] chemoreceptor axons project across the midline in the thoracic neuromere in males but not in females. However, the receptor cells that form sexually dimorphic axon terminals in the thoracic ganglia remain unknown. By generating labeled single-cell clones, we show that only a specific subset of fru [+] chemosensory neurons have axons that cross the midline in males. We further demonstrate that there exist two male-specific bristles, each harboring two chemosensory neurons; neither of which exhibits midline crossing, a masculine characteristic. This study reveals hitherto unrecognized sex differences in chemosensory neurons, imposing us to reinvestigate the pheromone input pathways that impinge on the central courtship circuit.
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