A mechanism for inside-out lamination in the neocortex.

Area of Science:

• Neuroscience
• Developmental Biology
• Cell Biology

Background:

• The layered structure of the neocortex forms through inside-out lamination.
• The role of Reelin in guiding neuronal migration is crucial but its precise mechanism remains debated.

Purpose of the Study:

• To propose a unified model for neocortical inside-out layering.
• To offer a new interpretation of Reelin's effects on neuronal migration.

Main Methods:

• Literature review and synthesis of existing data on Reelin and neuronal migration.
• Development of a conceptual model based on new interpretations of experimental results.

Main Results:

• Reelin likely acts on migrating neurons as their leading processes reach the marginal zone.
• Reelin initiates two key events: detachment from radial glia and soma translocation.
• This 'detach and go' model explains observed phenomena in normal and Reeler mutant cortices.

Conclusions:

• The proposed 'detach and go' model provides a unified explanation for neocortical development.
• This model reconciles various experimental findings regarding Reelin's function.
• Further research can validate this model in silico and in vivo.