Long-term editing of brain circuits in mice using an engineered electrical synapse

Area of Science:

• Neuroscience
• Molecular Biology
• Biotechnology

Background:

• Electrical signaling between neurons is crucial for cognitive and emotional functions.
• Existing methods for selectively regulating neural circuit communication are limited.

Purpose of the Study:

• To engineer a novel electrical synapse for precise modulation of mammalian neural circuits.
• To identify structural motifs enabling specific connexin hemichannel docking.

Main Methods:

• Utilized protein mutagenesis and an in vitro system to assay connexin hemichannel docking.
• Employed computational modeling to understand hemichannel interactions.
• Validated the engineered electrical synapse in vivo in C. elegans and mice.

Main Results:

• Identified a structural motif essential for electrical synapse formation.
• Designed connexin34.7 and connexin35 hemichannels that form specific electrical synapses.
• Demonstrated that the engineered synapse strengthens neural communication and modifies behavior.

Conclusions:

• Established 'Long-term integration of Circuits using connexins' (LinCx) as a method for precision circuit-editing in mammals.
• The engineered electrical synapse offers a new tool for neuroscience research and therapeutic development.