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Updated: May 27, 2025

Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures
Published on: November 11, 2016
Synaptic Targets of Circadian Clock Neurons Influence Core Clock Parameters
Eva Scholz-Carlson1,2, Aishwarya Ramakrishnan Iyer1, Aljoscha Nern3
1Department of Biology, Indiana University Bloomington. Bloomington, 47401 IN.
The study reveals that SLP316 neurons, postsynaptic partners of Drosophila circadian pacemaker neurons, regulate daily rhythms. Modulating their synaptic output affects circadian period and sleep-activity timing.
Area of Science:
- Neuroscience
- Chronobiology
- Insect Models
Background:
- Circadian rhythms rely on neuronal networks for timekeeping.
- In Drosophila, small ventral lateral neurons (sLNvs) are key circadian pacemakers.
- The role of synaptic connections from sLNvs to downstream neurons is largely unknown.
Purpose of the Study:
- To investigate the function of previously uncharacterized SLP316 neurons, identified as postsynaptic partners of sLNvs.
- To determine the role of SLP316 neuronal output in regulating circadian rhythms and behavior.
Main Methods:
- Connectomic analysis to identify sLNv synaptic targets.
- Genetic manipulation of SLP316 neuron activity using tetanus toxin (TNT) and NaChBac.
- Behavioral analysis of circadian period and activity under free-running and light-dark conditions.
Main Results:
- sLNvs form strong synaptic connections with SLP316 neurons.
- Silencing SLP316 neurons shortens the circadian period.
- Hyper-exciting SLP316 neurons lengthens the circadian period.
- SLP316 neuron silencing alters daytime activity and sleep patterns.
Conclusions:
- SLP316 neurons are a critical non-clock neuronal cell type postsynaptic to circadian pacemakers.
- These neurons play a significant role in regulating the timing of sleep and activity within the circadian system.
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Published on: July 4, 2018
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