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Patterning events and specification signals in the developing hippocampus.

E A Grove1, S Tole

  • 1Department of Neurobiology, Pharmacology and Physiology, University of Chicago, IL 60637, USA. egrove@drugs.bsd.uchicago.edu

Cerebral Cortex (New York, N.Y. : 1991)
|September 25, 1999
PubMed
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The mouse hippocampus develops distinct fields before birth, influenced by signals from the cortical hem. Molecular differences emerge by late gestation, indicating early patterning of this brain structure.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Molecular Biology

Background:

  • The mouse hippocampus serves as a model for cortical structure patterning.
  • Hippocampal field specification occurs prenatally, potentially involving cortical mantle signals.
  • While cytoarchitectural differences appear postnatally, molecular distinctions arise by late gestation.

Purpose of the Study:

  • To investigate the early patterning and specification of hippocampal fields in embryonic development.
  • To identify potential signaling sources regulating hippocampal field differentiation.
  • To understand the timing of molecular and structural development in the embryonic hippocampus.

Main Methods:

  • Analysis of embryonic mouse hippocampus development.
  • In vitro isolation of medial cortical neuroepithelium.

Related Experiment Videos

  • Study of mouse mutants with altered embryonic structures.

    • Main Results:

    • Embryonic hippocampal fields exhibit molecular differences by late gestation and are pre-specified for mature features.
    • Isolated medial cortical neuroepithelium can autonomously generate patterned hippocampal features.
    • The cortical hem, an embryonic structure, is identified as a source of regulatory signals for hippocampal patterning.

    Conclusions:

    • Hippocampal field development is initiated early in gestation, with molecular patterning preceding visible structural changes.
    • Signals from structures like the cortical hem play a crucial role in regulating hippocampal growth and patterning.
    • The basic hippocampal division is established very early, potentially before overt differentiation.