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Synaptic vesicle fusion along axons is driven by myelination and subsequently accelerates sheath growth in an activity-regulated manner

Almeida, R. G.; Williamson, J. M.; Madden, M. E.; Early, J. J.; Voas, M. G.; Talbot, W. S.; Bianco, I. H.; Lyons, D. A.

2020-08-28 neuroscience
10.1101/2020.08.28.271593 bioRxiv
Show abstract

To study activity-regulated myelination, we imaged synaptic vesicle fusion along single axons in living zebrafish, and found, surprisingly, that axonal synaptic vesicle fusion is driven by myelination. This myelin-induced axonal vesicle fusion was enriched along the unmyelinated domains into which newly-formed sheaths grew, and was promoted by neuronal activity, which in turn accelerated sheath growth. Our results indicate that neuronal activity consolidates sheath growth along axons already selected for myelination.

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