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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/153989
Helios modulates the maturation of a CA1 neuronal subpopulation required for spatial memory formation
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Currently, molecular, electrophysiological and structural studies delineate several neural subtypes in the hippocampus. However, the precise developmental mechanisms that lead to this diversity are still unknown. Here we show that alterations in a concrete hippocampal neuronal subpopulation during development specifically affect hippocampal-dependent spatial memory. We observed that the genetic deletion of the transcription factor Helios in mice, which is specifically expressed in developing hippocampal calbindin-positive CA1 pyramidal neurons (CB-CA1-PNs), induces adult alterations affecting spatial memory. In the same mice, CA3-CA1 synaptic plasticity and spine density and morphology in adult CB-CA1-PNs were severely compromised. RNAseq experiments in developing hippocampus identified an aberrant increase on the Visinin-like protein 1 (VSNL1) expression in the hippocampi devoid of Helios. This aberrant increase on VSNL1 levels was localized in the CB-CA1-PNs. Normalization of VSNL1 levels in CB-CA1-PNs devoid of Helios rescued their spine loss in vitro. Our study identifies a novel and specific developmental molecular pathway involved in the maturation and function of a CA1 pyramidal neuronal subtype.
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GIRALT TORROELLA, Albert, et al. Helios modulates the maturation of a CA1 neuronal subpopulation required for spatial memory formation. Experimental Neurology. 2020. Vol. 323, num. 113095. ISSN 0014-4886. [consulted: 8 of August of 2026]. Available at: https://hdl.handle.net/2445/153989