Futurity · Health

Genetic Atlas Reveals Axon Guidance Mechanism

Neuroscientists have identified a novel mechanism controlling how nerve cell axons navigate during development, potentially paving the way for repairing neural connections after injury.

Researchers at Brown University's Carney Institute for Brain Science have discovered that neurons use genetic switches in their cell bodies to guide the growth of their axons, challenging previous beliefs that guidance solely originated from the axon tip.

Published in PNAS, the study reveals that neurons activate and deactivate entire gene groups to direct axon growth through different path segments. This finding provides a "genetic atlas" of neuronal development.

Axons, crucial for neural wiring, extend from neurons to connect with target cells. Previously, it was thought their rapid response to the environment meant guidance signals came from the growing tip.

The research focused on commissural neurons, which connect different sides of the central nervous system. Using rodent cells and advanced genetic tools, the team analyzed gene expression at various developmental stages.

They found that as axons reached intermediate waystations, like the spinal cord midline, neurons altered their gene expression. This genetic shift triggered specific guidance molecules at the axon tip, directing it to the next checkpoint.

This discovery could address a key challenge in neural regeneration: making axons grow to the correct targets after damage from conditions like stroke or spinal cord injury.

The study also generated a comprehensive genetic atlas of over 12,000 neurons across developmental stages, offering a valuable resource for spinal cord research and future investigations into how gene groups collaborate in axon pathfinding.

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