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Related Experiment Videos

Engrailed and retinotectal topography

S Rétaux1, W A Harris

  • 1Laboratoire de Neurochimic-Anatomic, Institut des Neurosciences, Paris, France.

Trends in Neurosciences
|December 1, 1996
PubMed
Summary
This summary is machine-generated.

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The Engrailed gene establishes the visual map in the brain by creating a gradient that guides neural connections. This gene controls key molecules, revealing early steps in embryonic eye-brain wiring.

Area of Science:

  • Developmental biology
  • Neuroscience
  • Genetics

Background:

  • The precise wiring of the visual system, known as the retinotectal map, is crucial for vision.
  • The establishment of topographic maps in the brain is a complex process involving molecular guidance cues.
  • The role of specific genes in establishing this topography is an area of active research.

Purpose of the Study:

  • To investigate the function of the Engrailed homeobox gene in establishing the topographical organization of the tectum.
  • To understand how Engrailed influences the formation of the retinotectal map.
  • To identify the molecular pathways regulated by Engrailed in early embryonic development.

Main Methods:

  • Analysis of Engrailed gene expression patterns in the developing mesencephalon.

Related Experiment Videos

  • Experimental manipulation of Engrailed expression (ectopic expression) to observe effects on the retinotectal map.
  • Investigating the regulation of known retinotopic map 'realisators', such as ELF-1 and RAGS, by Engrailed.
  • Examining upstream signals like FGF8 and WNT1 that establish the Engrailed gradient.

    • Main Results:

    • An early-acting Engrailed gradient in the mesencephalon defines the rostrocaudal axis of the tectum.
    • Ectopic expression of Engrailed leads to predictable adjustments in the retinotectal map.
    • Engrailed directly regulates the expression of receptor tyrosine kinase ligands, including ELF-1 and RAGS.
    • Signals such as FGF8 and WNT1 are involved in setting up the Engrailed gradient.

    Conclusions:

    • Engrailed plays a critical role in establishing the topographic organization of the tectum and the retinotectal map.
    • Engrailed acts upstream of key guidance molecules (ELF-1, RAGS) involved in visual map formation.
    • The molecular cascade initiated by signals like FGF8 and WNT1, leading to Engrailed expression, is fundamental for correct embryonic eye-brain wiring.