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Control of Axon Branch Dynamics by Correlated Activity in Vivo
Edward S. Ruthazer,
Colin J. Akerman,
Hollis T. Cline*
Abstract:
To determine how patterned visual activity regulates the developmentof axonal projections, we collected in vivo time-lapse imagesof retinal axons from albino Xenopus tadpoles in which binocularinnervation of the optic tectum was induced. Axons added branchtips with nearly equal probability in all territories, but eliminatedthem preferentially from territory dominated by the oppositeeye. This selective branch elimination was abolished by blockadeof N-methyl-D-aspartate receptors. These results describe acorrelation-based mechanism by which visual experience directlygoverns axon branch dynamics that contribute to the developmentof topographic maps.
Cold Spring Harbor Laboratory, One Bungtown Road, Cold Spring Harbor, NY 11724, USA.
* To whom correspondence should be addressed. E-mail: cline{at}cshl.edu
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