Fast and sensitive GCaMP calcium indicators for neuronal imaging.

Area of Science:

• Neuroscience
• Molecular Biology
• Biotechnology

Background:

• Genetically encoded calcium indicators (GECIs) are vital tools for monitoring neural activity.
• The GCaMP family of green GECIs has been widely adopted for its effectiveness.

Approach:

• This review focuses on the development and application of GECIs, particularly the GCaMP series.
• We examine the properties of GECIs across various color channels (blue, cyan, green, yellow, red, far-red).
• Emphasis is placed on the latest jGCaMP8 sensors, noting their enhanced kinetic properties.

Key Points:

• The jGCaMP8 sensors exhibit significantly improved kinetics, with low-millisecond rise-times.
• These advancements enable the study of neural activity at timescales closer to underlying neural computations.
• GECIs offer a powerful method for real-time monitoring of neuronal function.

Conclusions:

• Further improvements in GECI technology are needed across different spectral channels.
• The development of advanced GECIs like jGCaMP8 opens new avenues for neuroscience research.
• Optimized GECIs are crucial for high-resolution mapping of brain activity.