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Distinct lineage-dependent structural and functional organization of the hippocampus.

Cell | Jun 19, 2014

The hippocampus, as part of the cerebral cortex, is essential for memory formation and spatial navigation. Although it has been extensively studied, especially as a model system for neurophysiology, the cellular processes involved in constructing and organizing the hippocampus remain largely unclear. Here, we show that clonally related excitatory neurons in the developing hippocampus are progressively organized into discrete horizontal, but not vertical, clusters in the stratum pyramidale, as revealed by both cell-type-specific retroviral labeling and mosaic analysis with double markers (MADM). Moreover, distinct from those in the neocortex, sister excitatory neurons in the cornu ammonis 1 region of the hippocampus rarely develop electrical or chemical synapses with each other. Instead, they preferentially receive common synaptic input from nearby fast-spiking (FS), but not non-FS, interneurons and exhibit synchronous synaptic activity. These results suggest that shared inhibitory input may specify horizontally clustered sister excitatory neurons as functional units in the hippocampus.

Pubmed ID: 24949968 RIS Download

Mesh terms: Animals | Embryo, Mammalian | Genetic Techniques | Hippocampus | Interneurons | Mice | Neurons | Staining and Labeling | Synapses

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Associated grants

  • Agency: NIDA NIH HHS, Id: R01 DA024681
  • Agency: NINDS NIH HHS, Id: P01 NS048120
  • Agency: NINDS NIH HHS, Id: P01NS048120
  • Agency: NCI NIH HHS, Id: P30 CA008748
  • Agency: NIDA NIH HHS, Id: R01DA024681
  • Agency: NIMH NIH HHS, Id: R21 MH083624
  • Agency: NIMH NIH HHS, Id: R01 MH101382
  • Agency: NIMH NIH HHS, Id: R01MH101382

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