RhoA in postnatal spinal motoneuron is essential for peripheral myelination.

RhoA in postnatal spinal motoneurons is crucial for peripheral myelination, with its absence causing significant hypomyelination in mice.

• Why it matters: Understanding how neurons regulate myelination is vital for addressing nerve repair and neurodegenerative diseases, yet the neuronal mechanisms controlling axon-glia communication are not fully known.
• What they did: The study used conditional knockout of RhoA in postnatal motoneurons, revealing its role in signaling pathways that influence Schwann cell differentiation and myelin formation through NRG1-γ secretion.
• The result: Loss of RhoA leads to impaired peripheral myelination without affecting neuron survival, highlighting a non-cell-autonomous function that could inform therapeutic strategies for demyelinating conditions.