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A Method for High Fidelity Optogenetic Control of Individual Pyramidal Neurons In vivo
Published on: September 2, 2013
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NPAS4 refines spatial and temporal firing in CA1 pyramidal neurons
Anja Payne1,2, Daniel A Heinz3, Chiaki Santiago1,4
1Neurosciences Graduate Program, UC San Diego; La Jolla, CA, United States.
Biorxiv : the Preprint Server for Biology
|March 27, 2026
Summary
The transcription factor NPAS4 refines neural activity in the hippocampus. Its deletion impairs spatial memory and temporal coding in CA1 pyramidal neurons, impacting learning and memory.
Area of Science:
- Neuroscience
- Molecular Biology
- Systems Neuroscience
Background:
- NPAS4 is an activity-dependent transcription factor.
- It regulates inhibitory synapses in hippocampal CA1 pyramidal neurons.
- NPAS4's role in information encoding based on past neuronal activity is not fully understood.
Purpose of the Study:
- To investigate the function of NPAS4 in CA1 pyramidal neurons in vivo.
- To determine the impact of NPAS4 deletion on spatial representations and neuronal firing precision.
Main Methods:
- Generated a CA1-specific knockout (KO) mouse model for NPAS4.
- Used optogenetic tagging to identify KO neurons in vivo.
- Recorded neuronal activity from wild-type (WT) and KO neurons in awake, behaving mice.
Main Results:
- NPAS4 deletion resulted in larger place fields and altered firing patterns (reduced in-field, increased out-of-field).
- Place field stability and coupling to theta oscillations were diminished in KO neurons.
- Temporal precision, including phase precession, was reduced following NPAS4 deletion.
Conclusions:
- NPAS4 is critical for refining spatial representations and temporal precision of CA1 pyramidal neuron activity.
- These neuronal properties are fundamental for learning and memory processes.
- The study demonstrates NPAS4's role in linking past neuronal activity to information encoding.
