Beyond replacement: Immature neurons as resilience partners in the aging hippocampus.

Farmer, W Todd; Song, Juan · Cell Stem Cell · 2026

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Abstract

Whether new neurons contribute to human cognition in old age remains debated. Recently in Cell Stem Cell, Tosoni et al.<sup>1</sup> show that immature-neuron transcriptional programs persist in the aged dentate gyrus and that their molecular state, not simply their abundance, tracks Alzheimer's pathology and cognitive resilience.