Centrosome’s Role in Neuronal Development Discovered

A recent study by researchers from the German Center for Neurodegenerative Diseases (DZNE) has revealed a central puzzle in the field of neurobiology — the role of centrosomes in the processes of neuronal growth and migration. The study, published in the journal Neuron, found that, while the centrosome regulates the migration of nerve cells to the cortex, it does not play a role in the formation and growth of the axon.

The researchers developed new molecular tools that allow for fine control of the centrosome to generate microtubules, demonstrating that centrosome activity can be decreased or increased as needed.

The discovery that axonal growth and control of migratory movement are unrelated was unexpected. The study aligned two theories that previously contradicted each other, as some experts believed that the centrosome plays a significant role in neuronal development, while others disputed it.

The researchers found that the centrosome is not necessary for axonal growth, but it plays a significant role in neuronal migration. The study may help develop a molecular therapy for some inherited diseases, such as developmental pachygyrias, linked to mutations of the centrosomal protein gamma-tubulin.

The study also revealed that tightly regulated centrosomal microtubule nucleation was required for an essential part of radial migration, the formation of cytoplasmic dilation at the leading process. Microtubule networks drive neuronal polarization and radial migration, providing insight into how neuronal migratory defects occur without predominantly affecting axonal tracts in human developmental cortical dysgeneses caused by mutations in gamma-tubulin.

For future work, the team wants to analyze different mechanisms occurring in neurons simultaneously and the role of acentrosomal formation of microtubules in axon growth.

The DZNE scientists’ discovery offers valuable insights into the mechanisms behind the dynamic processes of neuronal growth and migration. These findings help align two contradictory theories and can pave the way for molecular therapies for inherited diseases.