JUN 10, 2021 10:00 AM PDT

GABA-receptive microglia selectively sculpt developing inhibitory circuits

Sponsored by: Vizgen

Event Date & Time
Date:  June 10, 2021
Time: 10:00am (PDT),  1:00pm (EDT)
Microglia, the primary brain macrophages, regulate a plethora of processes that impact the organization of neural circuits, including synapse pruning. Whether microglia are generic effectors of synapse pruning or if specialized microglia are able to discriminate between distinct synapse types is unknown. We found that GABA-receptive microglia selectively interact with inhibitory cortical synapses during a critical window of mouse postnatal development. Single cell RNA-seq and MERFISH profiling showed that ablation of microglial GABAB receptors cell-autonomously alters a transcriptional synapse remodeling program. As a result, loss of GABABRs within microglia alters inhibitory connectivity without impacting excitatory synapses and leads to behavioral abnormalities. These findings demonstrate that distinct microglia differentially engage with specific synapse types during development.
Learning Objectives
  • Explain how MERFISH profiling can complement scRNA-seq data
  • Demonstrate how the selective communication between matching cell types regulates brain wiring
  • Reveal how early developmental events influence adult behavior
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