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Related Experiment Videos

Axonal guidance by an avoidance mechanism.

J Walter1, B Müller, F Bonhoeffer

  • 1Max-Planck-Institut für Entwicklungsbiologie Spemannstr, Tübingen, FRG.

Journal De Physiologie
|January 1, 1990
PubMed
Summary
This summary is machine-generated.

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Temporal retinal axons avoid posterior tectal membranes, indicating a repulsive component. This guidance mechanism is best explained by a gradient-reading model, distinct from simple growth inhibition.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Axon Guidance

Background:

  • Retinal axons navigate the brain to form precise connections.
  • Tectal membranes play a crucial role in guiding these axons during development.

Purpose of the Study:

  • To investigate the role of anterior and posterior tectal membranes in guiding temporal retinal axons.
  • To elucidate the molecular mechanisms underlying axon guidance cues.

Main Methods:

  • Culturing temporal retinal axons on substrates with alternating anterior and posterior tectal membrane lanes.
  • Inactivating posterior membranes using heat or phosphatidylinositol-specific phospholipase C (PI-PLC).

Main Results:

  • Temporal axons preferentially grow on anterior membranes and avoid posterior membranes.

Related Experiment Videos

  • Inactivation of posterior membranes eliminates the avoidance response.
  • Axon growth rate is not significantly reduced at the boundary between anterior and posterior membranes.

    • Conclusions:

    • Posterior tectal membranes contain a repulsive guidance cue for temporal retinal axons.
    • A gradient-reading model, analogous to chemotaxis, effectively explains the observed axon steering behavior.
    • Growth inhibition models require additional complex assumptions to account for the findings.