Tracing neuronal circuits in transgenic animals by transneuronal control of transcription (TRACT)
- California Institute of Technology, United States
Abstract
Understanding the computations that take place in brain circuits requires identifying how neurons in those circuits are connected to one another. We describe a technique called TRACT (TRAnsneuronal Control of Transcription) based on ligand-induced intramembrane proteolysis to reveal monosynaptic connections arising from genetically labeled neurons of interest. In this strategy, neurons expressing an artificial ligand ('donor' neurons) bind to and activate a genetically-engineered artificial receptor on their synaptic partners ('receiver' neurons). Upon ligand-receptor binding at synapses the receptor is cleaved in its transmembrane domain and releases a protein fragment that activates transcription in the synaptic partners. Using TRACT in Drosophila we have confirmed the connectivity between olfactory receptor neurons and their postsynaptic targets, and have discovered potential new connections between neurons in the circadian circuit. Our results demonstrate that the TRACT method can be used to investigate the connectivity of neuronal circuits in the brain.
Article and author information
Author details
Funding
National Institutes of Health (U01MH109147)
- Carlos Lois
The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.
Reviewing Editor
- Mani Ramaswami, Trinity College Dublin, Ireland
Version history
- Received: September 15, 2017
- Accepted: December 2, 2017
- Accepted Manuscript published: December 12, 2017 (version 1)
- Version of Record published: January 22, 2018 (version 2)
Copyright
© 2017, Huang et al.
This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.
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Tracing neuronal circuits in transgenic animals by transneuronal control of transcription (TRACT)
eLife 6:e32027.
https://doi.org/10.7554/eLife.32027
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