Spatial pattern of spontaneous retinal waves instructs retinotopic map refinement more than activity frequency

Developmental Neurobiology
Hong-Ping XuMichael C Crair

Abstract

Spontaneous activity during early development is necessary for the formation of precise neural connections, but it remains uncertain whether activity plays an instructive or permissive role in brain wiring. In the visual system, retinal ganglion cell (RGC) projections to the brain form two prominent sensory maps, one reflecting eye of origin and the other retinotopic location. Recent studies provide compelling evidence supporting an instructive role for spontaneous retinal activity in the development of eye-specific projections, but evidence for a similarly instructive role in the development of retinotopy is more equivocal. Here, we report on experiments in which we knocked down the expression of β2-containing nicotinic acetylcholine receptors (β2-nAChRs) specifically in the retina through a Cre-loxP recombination strategy. Overall levels of spontaneous retinal activity in retina-specific β2-nAChR mutant mice (Rx-β2cKO), examined in vitro and in vivo, were reduced to a degree comparable to that observed in whole animal β2-nAChR mouse mutants (β2KO). However, many residual spontaneous waves in Rx-β2cKO mice displayed local propagating features with strong correlations between nearby but not distant RGCs typical of waves observe...Continue Reading

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Citations

Sep 23, 2016·Frontiers in Neural Circuits·Alexandra H Leighton, Christian Lohmann
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Mar 27, 2021·Frontiers in Cellular Neuroscience·Nelly Redolfi, Claudia Lodovichi
Jun 25, 2021·Development, Growth & Differentiation·Shingo Nakazawa, Takuji Iwasato

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