Gabrb1-KO Mouse

Gabrb1, encoding the beta1 subunit of the gamma-aminobutyric acid A receptor (GABA A receptor), is responsible for mediating inhibitory neurotransmission in the thalamus [3]. The GABAergic pathway, in which Gabrb1 is involved, plays a crucial role in maintaining the balance between neuronal excitation and inhibition in the brain [2].

In Gabrb1-/-mouse models, autistic-like behaviors were observed. RNA-seq and single-cell RNA sequencing revealed up-regulation of Glul/Slc38a3 in astrocytes, Grin1/Grin2b in neurons, glutamate, and the Glu/GABA ratio in the hippocampus. Increased NMDAR-currents and reduced GABAAR-currents in CA1 neurons were detected. NMDAR antagonist memantine or Glul inhibitor methionine sulfoximine could rescue the abnormal behaviors, suggesting that upregulation of the glutamatergic synapse pathway may lead to autistic-like behaviors [1].

In conclusion, Gabrb1 is essential for mediating inhibitory neurotransmission in the thalamus. The Gabrb1-/-mouse model has provided valuable insights into the role of Gabrb1 in the development of autistic-like behaviors, highlighting the importance of the balance between glutamatergic and GABAergic systems in normal brain function.