Directed cell-type recruitment during consolidation of a remote memory
Zachary Zeidler1, Abigail L Yu1,2, Moonkyu Patrick Seong1
1Department of Physiology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA.
Biorxiv : the Preprint Server for Biology
|July 15, 2025
Summary
New research identifies specific prefrontal neurons that are gradually recruited for long-term memory storage. This discovery sheds light on how memory traces reorganize over time for remote recall.
Area of Science:
- Neuroscience
- Memory Consolidation
- Cellular Mechanisms
Background:
- Long-term memory storage involves neocortical networks.
- Remote memory retrieval recruits broader circuits than recent retrieval.
- The specific cell types and rules governing memory trace reorganization remain unclear.
Purpose of the Study:
- To identify the cell types and mechanisms responsible for memory trace reorganization during consolidation.
- To understand how memory representations change over time.
Main Methods:
- Identification of prefrontal projection neuron populations.
- Analysis of synaptic activity and neuronal recruitment during memory formation.
- Investigation of the prefrontal-temporal association area (TEa) pathway's role in memory retrieval.
Main Results:
- A specific class of prefrontal projection neurons is gradually recruited to memory traces.
- This recruitment is driven by the synaptic activity of learning-activated cells.
- The prefrontal-TEa pathway shows strengthening encoding of memory-induced behaviors and is crucial for remote, but not recent, memory retrieval.
Conclusions:
- Memory trace reorganization involves the progressive recruitment of specific prefrontal neuron populations.
- The prefrontal-TEa pathway plays a critical role in remote memory retrieval.
- This study reveals a cell type-specific mechanism for memory trace reorganization during consolidation.
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