Food perception alone stimulates oviposition through serotonin signaling in Drosophila

Summary

This laboratory study in Drosophila melanogaster reveals that sensory perception of dietary yeast alone—without actual nutrient intake—is sufficient to rapidly stimulate egg laying through olfactory signalling and serotonin receptor 2A (5-HT2A) activation. Brain connectomic analysis identified preferential neural circuits linking yeast-responsive olfactory neurons to oviposition descending neurons and endocrine tissues in the corpora allata, implicating serotonergic and dopaminergic modulation. The findings suggest that animals can adjust reproductive physiology based on sensory cues predicting food availability, independent of immediate nutrient acquisition.

Regional applicability

This is a fundamental neurobiology study in a model organism with no direct applicability to United Kingdom farming, food systems or human nutrition policy. The mechanistic insights into nutrient-sensing and reproductive regulation may inform broader understanding of how sensory information drives physiological responses, but the findings are specific to Drosophila biology.

Key measures

Oviposition rate, number of eggs laid, odorant receptor expression (Orco), serotonin receptor expression (5-HT2A, 5-HT2B), lifespan, brain connectomic mapping of olfactory-reproductive neural circuits

Outcomes reported

The study demonstrated that yeast odour exposure alone, without nutrient consumption, increased oviposition rate and egg number within hours in Drosophila melanogaster, mediated by olfactory signalling through Orco and serotonin receptor 2A (5-HT2A). Brain connectomic analyses revealed that yeast-responsive olfactory neurons preferentially influence oviposition descending neurons, which connect with endocrine circuitry enriched for serotonergic and dopaminergic modulation.

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