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    Formation of retinal direction-selective circuitry initiated by starburst amacrine cell homotypic contact.

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    Date
    2018-04-03
    Authors
    Field, Greg
    Kay, Jeremy
    Ray, Thomas A
    Roy, Suva
    Kozlowski, Christopher
    Wang, Jingjing
    Cafaro, Jon
    Hulbert, Samuel W
    Wright, Christopher VE
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    Abstract
    A common strategy by which developing neurons locate their synaptic partners is through projections to circuit-specific neuropil sublayers. Once established, sublayers serve as a substrate for selective synapse formation, but how sublayers arise during neurodevelopment remains unknown. Here we identify the earliest events that initiate formation of the direction-selective circuit in the inner plexiform layer of mouse retina. We demonstrate that radially-migrating newborn starburst amacrine cells establish homotypic contacts on arrival at the inner retina. These contacts, mediated by the cell-surface protein MEGF10, trigger neuropil innervation resulting in generation of two sublayers comprising starburst-cell dendrites. This dendritic scaffold then recruits projections from circuit partners. Abolishing MEGF10-mediated contacts profoundly delays and ultimately disrupts sublayer formation, leading to broader direction tuning and weaker direction-selectivity in retinal ganglion cells. Our findings reveal a mechanism by which differentiating neurons transition from migratory to mature morphology, and highlight this mechanism's importance in forming circuit-specific sublayers.
    Type
    Journal article
    Subject
    mouse
    neuroscience
    Permalink
    https://hdl.handle.net/10161/16624
    Published Version (Please cite this version)
    10.7554/elife.34241
    Publication Info
    Field, Greg; Kay, Jeremy; Ray, Thomas A; Roy, Suva; Kozlowski, Christopher; Wang, Jingjing; ... Wright, Christopher VE (2018). Formation of retinal direction-selective circuitry initiated by starburst amacrine cell homotypic contact. eLife, 7. 10.7554/elife.34241. Retrieved from https://hdl.handle.net/10161/16624.
    This is constructed from limited available data and may be imprecise. To cite this article, please review & use the official citation provided by the journal.
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    Scholars@Duke

    Field

    Greg D. Field

    Assistant Professor of Neurobiology
    My laboratory studies how the retina processes visual scenes and transmits this information to the brain.  We use multi-electrode arrays to record the activity of hundreds of retina neurons simultaneously in conjunction with transgenic mouse lines and chemogenetics to manipulate neural circuit function. We are interested in three major areas. First, we work to understand how neurons in the retina are functionally connected. Second we are studying how light-adaptation and circadian rhythms a
    Kay

    Jeremy N. Kay

    Assistant Professor of Neurobiology
    We study how neural circuits devoted to specific visual processing tasks arise during development of the retina, and the consequences for circuit function when development goes wrong. The tools of mouse genetics are central to our approach, and we draw on a wide range of molecular, genetic, and imaging methods.
    Alphabetical list of authors with Scholars@Duke profiles.
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