Neural and genetic mechanisms regulating copulation latency in male Drosophila melanogaster

Abstract This study investigates the factors influencing copulation latency (CL) in male Drosophila melanogaster, a crucial determinant of reproductive fitness. We explore the interplay between genetic, environmental, and social factors that shape mating strategies, emphasizing the role of behavioral plasticity in CL. Our findings reveal that sensory perception, particularly visual acuity, is critical for normal CL, as demonstrated by delayed mating in visual mutants. Contrary to expectations, metabolic state and prior experiences with rivals do not significantly affect CL. We identify specific circadian clock genes, period (per) and cycle (cyc), that independently regulate CL through mechanisms that are functionally separable from their canonical roles in circadian rhythm regulation. Additionally, we highlight the essential roles of ion transport peptide (ITP) and short neuropeptide F (sNPF) in modulating CL through ITP-LNd neurons. ITP-LNd neurons integrate various signaling inputs, including octopamine (OA) and glutamate (Glu), which are crucial for generating normal CL. This research provides novel insights into the genetic and neural mechanisms underlying behavioral plasticity in mating strategies, suggesting that the integration of clock gene function within neuropeptidergic signaling is essential for optimal reproductive success in Drosophila.