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Updated: Jul 14, 2026

Identification and Classification of Position-specific GABAA Receptor Subunit Missense Variants for Their Role In Hippocampal Pyramidal Neurons
Published on: June 6, 2025
Positive selection within the Schizophrenia-associated GABA(A) receptor beta(2) gene
Wing-Sze Lo1, Zhiwen Xu, Zhiliang Yu
1Department of Biochemistry, Applied Genomics Laboratory and HKH Bioinformatics Center, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.
Positive selection in the GABRB2 gene, linked to schizophrenia, favors specific alleles that alter GABA(A) receptor function. These recent evolutionary changes impact receptor sensitivity, particularly in individuals with schizophrenia.
Area of Science:
- Neurogenetics
- Evolutionary Biology
- Psychiatric Genetics
Background:
- The GABA(A) receptor is crucial for inhibitory neurotransmission.
- GABRB2 gene variants are associated with schizophrenia and influence receptor subunit expression.
Purpose of the Study:
- Investigate positive selection acting on GABRB2 gene variants.
- Determine the evolutionary history and functional impact of these selected variants.
Main Methods:
- Comparative genomics using chimpanzee as an ancestral reference.
- Analysis of single nucleotide polymorphisms (SNPs) and haplotype frequencies.
- Coalescence-based simulations and population genetic analyses.
- Electrophysiological studies of GABA(A) receptor isoforms.
Main Results:
- Derived alleles in GABRB2 showed high frequencies, suggesting positive selection.
- Haplotype analysis and reduced diversity supported recent positive selection for specific alleles.
- Schizophrenic and control populations exhibited divergent selection patterns.
- Selected variants increase beta(2) subunit expression, favoring a long isoform more sensitive to energy depletion.
Conclusions:
- This study provides the first evidence of positive selection in a schizophrenia-associated gene (GABRB2).
- Recent positive selection on GABRB2 variants has shaped GABA(A) receptor function, potentially influencing schizophrenia pathogenesis.
- The long beta(2) isoform, favored by selection, exhibits altered sensitivity, linking evolutionary changes to receptor function and disease.
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