Format

Send to

Choose Destination
Nat Methods. 2009 Dec;6(12):891-6. doi: 10.1038/nmeth.1397. Epub 2009 Nov 8.

Optical interrogation of neural circuits in Caenorhabditis elegans.

Author information

1
Harvard University, Cambridge, Massachusetts, USA.

Abstract

The nematode Caenorhabditis elegans has a compact nervous system with only 302 neurons. Whereas most of the synaptic connections between these neurons have been identified by electron microscopy serial reconstructions, functional connections have been inferred between only a few neurons through combinations of electrophysiology, cell ablation, in vivo calcium imaging and genetic analysis. To map functional connections between neurons, we combined in vivo optical stimulation with simultaneous calcium imaging. We analyzed the connections from the ASH sensory neurons and RIM interneurons to the command interneurons AVA and AVD. Stimulation of ASH or RIM neurons using channelrhodopsin-2 (ChR2) resulted in activation of AVA neurons, evoking an avoidance behavior. Our results demonstrate that we can excite specific neurons expressing ChR2 while simultaneously monitoring G-CaMP fluorescence in several other neurons, making it possible to rapidly decipher functional connections in C. elegans neural circuits.

PMID:
19898486
PMCID:
PMC3108858
DOI:
10.1038/nmeth.1397
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Nature Publishing Group Icon for PubMed Central
Loading ...
Support Center