Persistent transcriptional programmes are associated with remote memory.

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Gene expression's role in short-term memory is well-studied.
• Mechanisms of long-term, lifelong remote memory storage remain largely unknown.
• Medial prefrontal cortex is implicated in memory consolidation and retrieval.

Purpose of the Study:

• To investigate the single-cell gene expression landscape of remote memory storage.
• To identify molecular mechanisms underlying long-term memory maintenance.
• To explore the contribution of glial cells to remote memory.

Main Methods:

• Utilized a long-term contextual fear memory paradigm in mice.
• Performed single-cell RNA sequencing to analyze gene expression.
• Focused analysis on the medial prefrontal cortex.

Main Results:

• Identified persistent, activity-specific transcriptional alterations in neurons weeks after learning.
• Discovered genes related to membrane fusion potentially involved in memory maintenance.
• Observed persistent gene expression signatures in astrocytes and microglia associated with memory.

Conclusions:

• Remote memory storage involves sustained, cell-type-specific gene expression programs.
• Glial cells, including astrocytes and microglia, actively participate in remote memory circuits.
• Findings contribute to understanding activity-dependent cellular states and memory mechanisms.