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<p>The <i>APOE</i>-ε4 allele is the strongest genetic risk factor for late-onset Alzheimer’s disease. However, <i>APOE</i>-ε4 is not deterministic, highlighting the need to identify additional genetic and environmental factors. <i>APOE</i>-ε4 has been linked to accelerated cognitive decline, so we sought to investigate genetic factors that modify <i>APOE</i>-ε4–associated cognitive decline. We conduct cross-ancestry <i>APOE</i>-ε4-stratified and interaction GWAS using harmonized cognitive data from 32,778 participants, including 29,354 non-Hispanic White and 3,424 non-Hispanic Black individuals. Our primary outcome is late-life cognition, measured using harmonized composite scores for memory, executive function, and language, modeled as continuous traits reflecting both normative cognitive aging and disease-related decline. We identify two genome-wide significant loci in <i>APOE</i>-ε4 carriers, reaching genome-wide significance for executive function. These loci also demonstrate nominal associations across the other domains, suggesting broad effects on cognition. In non-carriers, we identify a genome-wide significant association at <i>ITGB8</i> restricted to executive function, and another locus associated with language. We further link these loci to <i>SEMA6D</i>, <i>GRIN3A</i>, and <i>ITGB8</i> through expression and methylation databases. Post-GWAS analyses implicate additional genes including <i>SLCO1A2</i>, and <i>DNAH11</i>. Genetic correlation analyses reveal differences by <i>APOE</i>-ε4 status for immune-related traits, suggesting immune-related predispositions may exacerbate cognitive risk in <i>APOE</i>-ε4 carriers.</p>

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Genetic modifiers of APOE-ε4-associated cognitive decline

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  • 发表日期：

    2026年2月20日

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摘要

The APOE-ε4 allele is the strongest genetic risk factor for late-onset Alzheimer’s disease. However, APOE-ε4 is not deterministic, highlighting the need to identify additional genetic and environmental factors. APOE-ε4 has been linked to accelerated cognitive decline, so we sought to investigate genetic factors that modify APOE-ε4–associated cognitive decline. We conduct cross-ancestry APOE-ε4-stratified and interaction GWAS using harmonized cognitive data from 32,778 participants, including 29,354 non-Hispanic White and 3,424 non-Hispanic Black individuals. Our primary outcome is late-life cognition, measured using harmonized composite scores for memory, executive function, and language, modeled as continuous traits reflecting both normative cognitive aging and disease-related decline. We identify two genome-wide significant loci in APOE-ε4 carriers, reaching genome-wide significance for executive function. These loci also demonstrate nominal associations across the other domains, suggesting broad effects on cognition. In non-carriers, we identify a genome-wide significant association at ITGB8 restricted to executive function, and another locus associated with language. We further link these loci to SEMA6D, GRIN3A, and ITGB8 through expression and methylation databases. Post-GWAS analyses implicate additional genes including SLCO1A2, and DNAH11. Genetic correlation analyses reveal differences by APOE-ε4 status for immune-related traits, suggesting immune-related predispositions may exacerbate cognitive risk in APOE-ε4 carriers.