Alzheimer's disease: rare variants with large effect sizes

Area of Science:

• Genetics
• Neuroscience
• Genomics

Background:

• Alzheimer's disease (AD) genetics research has advanced with new sequencing and genotyping technologies.
• These technologies focus on low-frequency and coding variants, enabling the identification of novel genes associated with AD risk.

Purpose of the Study:

• To highlight the advantages of advanced sequencing and genotyping over traditional genome-wide association studies (GWAS) for AD genetics.
• To discuss the challenges and future directions in identifying AD risk genes.

Main Methods:

• Utilizing next-generation sequencing and novel genotyping arrays to analyze low-frequency and coding variants.
• Leveraging large datasets exceeding 10,000 cases and controls.
• Combining sequencing and genotyping approaches for comprehensive genetic analysis.

Main Results:

• Identification of novel coding variants with large effect sizes linked to Alzheimer's disease risk.
• Discovery of novel genes (e.g., TREM2, PLD3, UNC5C, AKAP9) associated with AD.
• Enabling functional studies of identified variants and genes in cellular and animal models.

Conclusions:

• Advanced sequencing and genotyping offer gene-driven associations and functional insights superior to traditional GWAS.
• Replication of results for low-frequency variants is challenging due to population variability.
• Large-scale, combined sequencing and genotyping studies are essential for future Alzheimer's disease gene discovery.