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Updated: Apr 19, 2026

Identification and Classification of Position-specific GABAA Receptor Subunit Missense Variants for Their Role In Hippocampal Pyramidal Neurons
Published on: June 6, 2025
Protective variant for hippocampal atrophy identified by whole exome sequencing
Kwangsik Nho1, Sungeun Kim, Shannon L Risacher
1Center for Neuroimaging, Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN; Center for Computational Biology and Bioinformatics, Indiana University School of Medicine, Indianapolis, IN.
Researchers identified a novel genetic variant in the REST gene associated with slower brain atrophy in mild cognitive impairment. This discovery highlights REST
Area of Science:
- Neuroscience
- Genetics
- Alzheimer's Disease Research
Background:
- Mild cognitive impairment (MCI) is a precursor to Alzheimer's disease.
- Hippocampal atrophy rate is a key biomarker for MCI progression.
- APOE variants are known genetic factors, but other contributors remain largely unexplored.
Purpose of the Study:
- To identify novel genetic variants, beyond APOE, influencing hippocampal atrophy rate in amnestic MCI.
- To investigate the role of the REST gene in neurodegenerative processes.
- To explore potential therapeutic targets for Alzheimer's disease.
Main Methods:
- Whole-exome sequencing was employed to analyze genetic variations.
- In-silico prediction identified a missense variant in the REST gene (rs3796529).
- Unbiased whole-brain analysis and meta-analysis across five independent cohorts validated the findings.
Main Results:
- A specific REST variant (rs3796529) was exclusively found in subjects exhibiting slow hippocampal volume loss.
- REST, a regulator of neurogenesis, was identified as a novel factor in Alzheimer's disease.
- The study confirmed REST's association with neuroprotection and reduced atrophy rates.
Conclusions:
- The REST gene and its pathways represent potential protective mechanisms against neurodegeneration.
- Combining next-generation sequencing and neuroimaging can uncover new disease mechanisms.
- REST variants offer potential therapeutic targets for Alzheimer's disease and related dementias.
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