Neurexin and Neuroligin-based adhesion complexes drive axonal arborisation growth independent of synaptic activity

Building arborisations of the right size and shape is fundamental for neural network function. Live imaging in vertebrate brains strongly suggests that nascent synapses are critical for branch growth during development. The molecular mechanisms underlying this are largely unknown. Here we present a...

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Bibliographic Details
Published in:eLife 2018-03, Vol.7
Main Authors: Constance, William D, Mukherjee, Amrita, Fisher, Yvette E, Pop, Sinziana, Blanc, Eric, Toyama, Yusuke, Williams, Darren W
Format: Article
Language:English
Subjects:
Algorithms
arbor growth
axonal arborisations
Filopodia
Hypotheses
Metamorphosis
Molecular modelling
Neural networks
Neurobiology
Neuroscience
Neurosciences
Neurotransmission
Neurotransmitter receptors
Software
synaptogenesis
synaptotropic
Time series
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Summary:Building arborisations of the right size and shape is fundamental for neural network function. Live imaging in vertebrate brains strongly suggests that nascent synapses are critical for branch growth during development. The molecular mechanisms underlying this are largely unknown. Here we present a novel system in for studying the development of complex arborisations live, in vivo during metamorphosis. In growing arborisations we see branch dynamics and localisations of presynaptic proteins very similar to the 'synaptotropic growth' described in fish/frogs. These accumulations of presynaptic proteins do not appear to be presynaptic release sites and are not paired with neurotransmitter receptors. Knockdowns of either evoked or spontaneous neurotransmission do not impact arbor growth. Instead, we find that axonal branch growth is regulated by dynamic, focal localisations of Neurexin and Neuroligin. These adhesion complexes provide stability for filopodia by a 'stick-and-grow' based mechanism wholly independent of synaptic activity.
ISSN:2050-084X
2050-084X
DOI:10.7554/eLife.31659