Loss of signaling significantly decreases the ability to form associative memory.
Mutations of PDF and its receptor were examined for their impact on memory in male and female Drosophila.
Appetitive is decreased throughout the day in mutants, with a more pronounced effect in the morning.
The observed memory deficits are linked to PDFR expression in neurons outside the core clock circuit and in the mushroom body Kenyon cells.
Aversive short-term memory requires PDF but not PDFR, indicating different pathways for positive and negative memory formation.
The findings suggest multiple oscillators may normalize memory formation across the day for appetitive processes.
Simplified
Dissociation between the output of the circadian clock and external environmental cues is a major cause of human cognitive dysfunction. While the effects of ablation of the molecular clock on memory have been studied in many systems, little has been done to test the role of specific clock circuit output signals. To address this gap, we examined the effects of mutations of() and its receptor,, on associative memory in male and femaleLoss of signaling significantly decreases the ability to form associative memory. Appetitive (STM), which in wild-type (WT) is time-of-day (TOD) independent, is decreased across the day by mutation ofor, but more substantially in the morning than in the evening. This defect is because of PDFR expression in adult neurons outside the core clock circuit and the mushroom body (MB) Kenyon cells (KCs). The acquisition of a TOD difference in mutants implies the existence of multiple oscillators that act to normalize memory formation across the day for appetitive processes. Interestingly, aversive STM requires PDF but not PDFR, suggesting that there are valence-specific pathways downstream of PDF that regulate memory formation. These data argue that the circadian clock uses circuit-specific and molecularly diverse output pathways to enhance the ability of animals to optimize responses to changing conditions.From humans to invertebrates, cognitive processes are influenced by organisms' internal circadian clocks, the pace of which is linked to the solar cycle. Disruption of this link is increasingly common (e.g., jetlag, social jetlag disorders) and causes cognitive impairments that are costly and long lasting. A detailed understanding of how the internal clock regulates cognition is critical for the development of therapeutic methods. Here, we show for the first time that olfactory associative memory inrequires signaling by Pigment-dispersing factor (PDF), a neuromodulatory signaling peptide produced only by circadian clock circuit neurons. We also find a novel role for the clock circuit in stabilizing appetitive sucrose/odor memory across the day. Pigment-dispersing factor Pdf Pdfr Drosophila Pdf Pdfr Drosophila SIGNIFICANCE STATEMENT
Key numbers
6.43E-23
Decrease in Appetitive
Two-way ANOVA results for performance across time points.
70.4%
70.4% vs. 95.6% Rhythmicity
Percentage of rhythmic activity in free-running conditions.
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