A multiple Arc tagging approach for tracking neuronal ensembles across experiences.

The multiple Arc (mArc) system tags two Arc+ neuronal ensembles in the dentate gyrus (DG), revealing that similar context and valence experiences are encoded in overlapping ensembles.

• Why it matters: Single-ensemble Arc/Arg3.1 tagging limits comparisons across multiple memories. This work addresses how DG ensemble reactivation varies with context, time, and valence.
• What they did: The authors developed mArc to label two Arc+ ensembles and validated it in the DG by testing how context, time, and valence affect ensemble overlap during encoding and reactivation.
• The result: Ensembles for experiences closer in time show more overlapping DG ensembles, and similar contextual and valenced experiences share overlapping ensembles, enabling investigation of multiple memories.

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