High-resolution imaging and manipulation of endogenous AMPA receptor surface mobility during synaptic plasticity and...

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Synaptic efficacy relies on regulating neurotransmitter receptor content for plasticity and adaptation.
• Current experimental methods to track and modify receptor movements in vivo are limited.

Purpose of the Study:

• To develop a novel genetic model for monitoring and manipulating endogenous AMPA-type glutamate receptors (AMPARs).
• To investigate the role of AMPAR surface mobility in synaptic plasticity and memory formation.

Main Methods:

• Generated a knock-in mouse model expressing a biotin acceptor peptide (AP) tag on the extracellular N-terminus of GluA2 subunit of AMPARs.
• Utilized cell-specific biotin ligase and avidin variants to monitor and manipulate AP-tagged AMPAR surface mobility in specific neuronal populations.
• Assessed the impact of AMPAR immobilization on long-term potentiation and contextual fear memory.

Main Results:

• Successfully generated a tool to track and manipulate endogenous AMPARs in specific neuronal subsets.
• Immobilization of AMPARs prevented long-term potentiation and contextual fear memory formation.
• Demonstrated target-specific control over synaptic plasticity and animal behavior.

Conclusions:

• The AP tag knock-in mouse model provides unprecedented spatiotemporal control over endogenous receptor dynamics.
• This model opens new avenues for studying the molecular mechanisms underlying synaptic plasticity, learning, and memory.