Journal
ELIFE
Volume 6, Issue -, Pages -Publisher
ELIFE SCIENCES PUBLICATIONS LTD
DOI: 10.7554/eLife.23329
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Funding
- Wellcome Trust [099222/Z/12/Z]
- European Commission [623714 AxonGliaPlasticity]
- Japan Society for the Promotion of Science London [24650181, 25245069]
- Grants-in-Aid for Scientific Research [25245069, 24650181] Funding Source: KAKEN
- Wellcome Trust [099222/Z/12/Z] Funding Source: researchfish
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Myelination speeds conduction of the nerve impulse, enhancing cognitive power. Changes of white matter structure contribute to learning, and are often assumed to reflect an altered number of myelin wraps. We now show that, in rat optic nerve and cerebral cortical axons, the node of Ranvier length varies over a 4.4-fold and 8.7-fold range respectively and that variation of the node length is much less along axons than between axons. Modelling predicts that these node length differences will alter conduction speed by similar to 20%, similar to the changes produced by altering the number of myelin wraps or the internode length. For a given change of conduction speed, the membrane area change needed at the node is >270-fold less than that needed in the myelin sheath. Thus, axon-specific adjustment of node of Ranvier length is potentially an energy-efficient and rapid mechanism for tuning the arrival time of information in the CNS.
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