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Environment-specific expression of the immediate-early gene Arc in hippocampal neuronal ensembles


We used fluorescent in-situ hybridization and confocal microscopy to monitor the subcellular distribution of the immediate-early gene Arc. Arc RNA appeared in discrete intranuclear foci within minutes of neuronal activation and subsequently disappeared from the nucleus and accumulated in the cytoplasm by 30 minutes. The time course of nuclear versus cytoplasmic Arc RNA accumulation was distinct, and could therefore be used to infer the activity history of individual neurons at two times. Following sequential exposure of rats to two different environments or to the same environment twice, the proportion of CA1 neurons with cytoplasmic, nuclear or overlapping Arc expression profiles matched predictions derived from ensemble neurophysiological recordings of hippocampal neuronal ensembles. Arc gene induction is thus specifically linked to neural encoding processes.

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Figure 1: Different cell staining profiles detected using Arc FISH.
Figure 2: Time course of Arc and zif268 RNA induction in CA1 neurons after seizure (MECS).
Figure 3: Time course of Arc RNA induction in different brain regions following exploration of a novel environment.
Figure 4: Arc catFISH defines CA1 neuronal ensembles encoding distinct environments.


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We thank G. Stevenson, F. Houston and M. Papapavlou for technical assistance. This work was supported by the National Institute on Aging and the National Institute of Mental Health.

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Correspondence to John F. Guzowski.

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Guzowski, J., McNaughton, B., Barnes, C. et al. Environment-specific expression of the immediate-early gene Arc in hippocampal neuronal ensembles. Nat Neurosci 2, 1120–1124 (1999).

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