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Viral Tracing of Genetically Defined Neural Circuitry
Published on: October 17, 2012
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A bicistronic lentiviral vector-based method for differential transsynaptic tracing of neural circuits
Yohei Ohashi1, Tadashi Tsubota, Ayana Sato
1Department of Physiology, The University of Tokyo School of Medicine, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Molecular and Cellular Neurosciences
|September 7, 2010
Summary
Researchers developed a novel bicistronic lentiviral vector for neural pathway tracing. This tool efficiently labels neurons and differentiates neuronal populations in the brain.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Neural circuit tracing is crucial for understanding brain function.
- Existing methods often lack specificity or require multiple labeling steps.
- A tool for differential transsynaptic tracing is needed.
Purpose of the Study:
- To develop and validate a bicistronic lentiviral vector system for differential transsynaptic tracing of neural pathways.
- To enable discrimination between neuronal populations based on co-expression of reporter proteins.
Main Methods:
- Development of a bicistronic lentiviral vector co-expressing AcGFP1 and WGA via a 2A peptide.
- Injection of the vector into specific brain regions (rat cerebellum, somatosensory cortex; monkey cerebellum).
- Detection of AcGFP1 and WGA proteins in first, second, and third-order neurons.
Main Results:
- Efficient co-expression of AcGFP1 and WGA in local Purkinje cells (first-order neurons).
- Differential detection of WGA but not AcGFP1 in second-order neurons (cerebellar/vestibular nuclei).
- Successful tracing of pathways to the thalamus and cortical regions in rats and monkeys.
Conclusions:
- The bicistronic lentiviral vector system enables differential transsynaptic tracing.
- It allows for clear discrimination between neuronal populations.
- This system is a valuable tool for mapping complex neural circuits.
