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Morphological Analysis of Drosophila Larval Peripheral Sensory Neuron Dendrites and Axons Using Genetic Mosaics
Published on: November 7, 2011
Patterns of connectivity in a Drosophila nerve
M D Egger1, R S Nowakowski, B Peng
1Department of Neuroscience and Cell Biology, UMDNJ-Robert Wood Johnson Medical School, Piscataway, New Jersey 08854-5635, USA. egger@umdnj.edu
The Journal of Comparative Neurology
|October 23, 1997
Summary
Synaptic connections between a specific neuron and motor axons in fruit flies show a higher density near the nerve center. A mutation alters this distribution, increasing contact area without changing the total synapse number.
Area of Science:
- Neuroscience
- Developmental Biology
- Insect Neurobiology
Background:
- En passant synapses are crucial for neural circuit function.
- Understanding synaptic distribution patterns provides insights into neural development and organization.
- The fruit fly Drosophila melanogaster is a powerful model for studying neurobiology.
Purpose of the Study:
- To investigate the spatial distribution of synaptic profiles between a premotor interneuron and motoneuron axons in Drosophila.
- To analyze how a mutation (Passover) affects this synaptic distribution and the physical contact between these neurons.
Main Methods:
- Examined synaptic profiles in en passant synapses using electron microscopy in wild-type and mutant Drosophila.
- Quantified the density and distribution of synaptic profiles along motoneuron axons.
- Measured the area of contiguity between the interneuron and motoneuron axons.
Main Results:
- Synaptic profiles were densest near the thoracic ganglion, with a cumulative distribution following an exponential decay pattern.
- Ultrastructure and total number of synaptic profiles were similar between wild-type and Passover mutant flies.
- The distribution of synaptic profiles across individual motoneuron axons differed significantly in mutants, with a larger contact area observed in Passover mutants.
Conclusions:
- Synaptic connectivity in the studied pathway is established with a specific spatial bias.
- The Passover mutation disrupts the precise spatial arrangement of synapses without affecting their overall number or basic ultrastructure.
- Increased contiguity in mutants suggests altered mechanisms of synapse stabilization or targeting.
Keywords:
Non-programmatic
