Ascending SAG neurons control sexual receptivity of Drosophila females

Behavioral plasticity: a nose for every season

A recent study in Caenorhabditis elegans identifies the dynamic expression of a single odorant receptor as a molecular mechanism for context-dependent modulation of olfactory preferences and food prioritization.

Mechanosensitive neurons on the internal reproductive tract contribute to egg-laying-induced acetic acid attraction in Drosophila

Selecting a suitable site to deposit their eggs is an important reproductive need of Drosophila females. Although their choosiness toward egg-laying sites is well documented, the specific neural mechanism that activates females' search for attractive egg-laying sites is not known. Here, we show that distention and contraction of females' internal reproductive tract triggered by egg delivery through the tract plays a critical role in activating such search. We found that females start to exhibit acetic acid (AA) attraction prior to depositing each egg but no attraction when they are not laying eggs. Artificially distending the reproductive tract triggers AA attraction in non-egg-laying females, whereas silencing the mechanosensitive neurons we identified that can sense the contractile status of the tract eliminates such attraction. Our work uncovers the circuit basis of an important reproductive need of Drosophila females and provides a simple model for dissecting the neural mechanism that underlies a reproductive need-induced behavioral modification.

Unveiling the secrets to her heart

Before consenting to copulate, a female fruit fly gauges both her mating status and her suitor's quality. Three recent studies, Bussell et al. (2014) in Current Biology and Feng et al. (2014) and Zhou et al. (2014) in this issue of Neuron, dissected the receptivity circuit of female Drosophila, providing insights into how she integrates courtship cues, assesses her internal state, and directs the motor programs that facilitate copulation.