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Basic Science and Pathogenesis.

Alex G Contreras1,2, Skylar Walters3, Jaclyn M Eissman4

  • 1Vanderbilt Memory & Alzheimer's Center, Nashville, TN, USA.

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Summary
This summary is machine-generated.

This study investigated how genetic variants (SNPs), sex, and APOE-ε4 status interact to affect memory in Alzheimer's disease (AD). Preliminary findings suggest a potential link between the HGSNAT gene and APOE-ε4 in cognitive decline, particularly in males.

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Area of Science:

  • Genetics
  • Neuroscience
  • Alzheimer's Disease Research

Background:

  • Alzheimer's disease (AD) disproportionately affects women, with known sex-specific APOE effects on cognition.
  • The interaction between APOE genotype, sex, and single nucleotide polymorphisms (SNPs) on cognitive domains is not well understood.

Purpose of the Study:

  • To investigate the three-way interaction of SNP×APOE-ε4×sex on memory using a genome-wide association study (GWAS) meta-analysis.
  • To identify novel genetic variants and biological pathways influencing cognitive performance modulated by sex and APOE status.

Main Methods:

  • Conducted a GWAS meta-analysis using harmonized memory data from six cohorts, including 33,440 European-ancestry individuals.
  • Focused on the SNP×APOE-ε4×sex interaction for memory and performed stratified main-effects GWAS by sex and APOE-ε4 status.

Main Results:

  • Identified 112 suggestive SNPs for the three-way interaction, with one locus intronic to HGSNAT, a gene linked to lysosomal function.
  • Discovered four genome-wide significant main-effect signals for memory in male APOE-ε4 carriers, with rs76307224 showing the strongest association (P=2.18×10⁻¹⁰).
  • Observed no significant associations in females, irrespective of APOE genotype.

Conclusions:

  • Preliminary findings suggest a potential novel connection between HGSNAT, APOE-ε4, and cognitive decline, possibly involving lysosomal dysfunction.
  • The study highlights the importance of considering sex and APOE status when analyzing genetic associations with cognitive performance.
  • Future analyses with larger, diverse datasets and other cognitive domains will enhance understanding of AD risk and generalizability.