6533b7dcfe1ef96bd12716a9
RESEARCH PRODUCT
Intra-neuronal Competition for Synaptic Partners Conserves the Amount of Dendritic Building Material
Kathryn ScheckelStefanie RyglewskiFernando VonhoffCarsten Duchsubject
0301 basic medicineDendritic spinePresynaptic TerminalsBiologyReceptors NicotinicArticleSynapse03 medical and health sciencesDendrite (crystal)Calcium Channels T-Type0302 clinical medicinePostsynaptic potentialSynaptic augmentationmedicineAnimalsDrosophila ProteinsCalcium Signalinggamma-Aminobutyric AcidNeuronsNeuronal PlasticityGeneral NeuroscienceDendritesReceptors GABA-AAcetylcholine030104 developmental biologySynaptic fatiguemedicine.anatomical_structurenervous systemSynaptic plasticitySynapsesDrosophilaNeuronNeuroscience030217 neurology & neurosurgerydescription
Brain development requires correct targeting of multiple thousand synaptic terminals onto staggeringly complex dendritic arbors. The mechanisms by which input synapse numbers are matched to dendrite size, and by which synaptic inputs from different transmitter systems are correctly partitioned onto a postsynaptic arbor, are incompletely understood. By combining quantitative neuroanatomy with targeted genetic manipulation of synaptic input to an identified Drosophila neuron, we show that synaptic inputs of two different transmitter classes locally direct dendrite growth in a competitive manner. During development, the relative amounts of GABAergic and cholinergic synaptic drive shift dendrites between different input domains of one postsynaptic neuron without affecting total arbor size. Therefore, synaptic input locally directs dendrite growth, but intra-neuronal dendrite redistributions limit morphological variability, a phenomenon also described for cortical neurons. Mechanistically, this requires local dendritic Ca2+ influx through Dα7nAChRs or through LVA channels following GABAAR-mediated depolarizations. VIDEO ABSTRACT.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-02-01 |