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Targeted Labeling of Neurons in a Specific Functional Micro-domain of the Neocortex by Combining Intrinsic Signal and Two-photon Imaging

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Published on: December 12, 2012

Temporal identity in axonal target layer recognition.

Milan Petrovic¹, Thomas Hummel

¹Institut für Neurobiologie, Universität Münster, Badestrasse 9, D-48149 Münster, Germany.

|November 4, 2008

Summary

This summary is machine-generated.

Temporal expression of the zinc-finger protein sequoia guides Drosophila photoreceptor connections. This temporal identity allows neurons to respond to broadly expressed adhesion molecules, ensuring precise synaptic layer formation.

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Area of Science:

Neuroscience
Developmental Biology
Molecular Biology

Background:

Synaptic layer formation is crucial for brain information processing.
Layer-specific recognition molecules are known, but broadly expressed ones pose a specificity challenge.

Purpose of the Study:

Investigate the role of temporal expression dynamics in neuronal connectivity.
Determine how broadly expressed adhesion molecules achieve synaptic specificity.

Main Methods:

Utilized Drosophila photoreceptor system for studying neuronal connectivity.
Manipulated the expression timing of the zinc-finger protein sequoia in R7 and R8 photoreceptors.
Examined the effects on axon targeting and synaptic layer formation.

Main Results:

Temporal expression of sequoia dictates Drosophila photoreceptor connectivity into distinct synaptic layers.
Altered sequoia expression in R7 or R8 photoreceptors caused projection switches to incorrect layers.
Sequoia-mediated axon targeting relies on the broadly expressed Cadherin-N cell adhesion molecule.

Conclusions:

Temporal identity, through sequoia expression dynamics, is a key determinant of synaptic specificity.
This mechanism allows temporally restricted axonal competence to interact with broadly expressed adhesion molecules.
Temporal identity provides crucial information for generating connection diversity in developing neurons.