btbd11b Antibody

Definition and Biological Context

Btbd11 is an inhibitory interneuron-specific protein localized to glutamatergic postsynaptic densities (PSDs). It interacts with core synaptic proteins like PSD-95 and regulates synaptic function, neuronal circuit activity, and behavior . Antibodies targeting Btbd11 are critical for studying its role in synaptic plasticity and neurological disorders .

Synaptic Localization Studies

• Method: CRISPR knockin (ORANGE method) tagged endogenous Btbd11 with GFP in rat cortical neurons.

• Key Results:

  • Btbd11 puncta colocalized with PSD-95 at glutamatergic synapses (100% overlap in GAD67-positive interneurons) .

  • Minimal overlap with gephyrin (GABAergic synapse marker) .

Functional Characterization

• Liquid-Liquid Phase Separation (LLPS): Co-expression with PSD-95 induces LLPS, suggesting a role in organizing synaptic protein condensates .

• Knockout Effects:

  • Reduced glutamatergic signaling in parvalbumin-positive interneurons .

  • Disrupted network activity in vitro and in vivo .

  • Behavioral changes: Increased hyperactivity upon NMDA receptor antagonist challenge .

Antibody Specificity

• Custom Antibodies: Generated for Btbd11 due to lack of commercial options . Validated via:

  • Western blot selectivity in vGAT:PSD-95-GFP samples .

  • Immunofluorescence in GAD67-positive interneurons (Figures S1E, S1F) .

• Commercial Antibody (NBP3-17152): Validated in human U-2 OS cells, with nucleoplasmic localization observed .

Limitations and Considerations

• Species Specificity: Commercial antibody’s reactivity in mice/rats is predicted but not fully validated .

• Clinical Use: Not approved for diagnostic applications .

• Discrepancies: Commercial antibody shows nucleoplasmic localization , whereas endogenous Btbd11 is synaptic , suggesting context-dependent epitope accessibility.

Comparative Research Findings