In vivo neuronal calcium imaging in C. elegans

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• The nematode worm C. elegans is a powerful model organism for in vivo neuronal imaging due to its transparency and simple nervous system.
• Genetically encoded calcium-sensitive fluorophores like cameleon and GCaMP enable real-time monitoring of neuronal activity.
• Transgenic C. elegans strains expressing these fluorophores are widely available, facilitating research.

Purpose of the Study:

• To describe detailed procedures for in vivo neuronal calcium imaging in C. elegans using GCaMP and cameleon.
• To compare the advantages and disadvantages of GCaMP and cameleon for calcium dynamics measurements.
• To present experimental applications of these techniques in C. elegans.

Main Methods:

• Utilized genetically encoded calcium indicators (cameleon and GCaMP) for fluorescence imaging of neuronal activity.
• Employed simple immobilization techniques for extended time-lapse imaging of C. elegans.
• Performed image analysis to quantify calcium dynamics in single neurons.

Main Results:

• Demonstrated the measurement of sensory neuron response to an electrical field using GCaMP.
• Showcased the assessment of neuronal calcium response to laser-induced damage using cameleon.
• Validated the feasibility of in vivo calcium imaging in C. elegans for diverse experimental paradigms.

Conclusions:

• C. elegans provides a technically simple and cost-effective system for in vivo neuronal imaging.
• Calcium imaging in C. elegans can be extended to freely moving animals and multiple neurons.
• These techniques are valuable for studying neuronal physiology and activity across different genetic backgrounds.