GWAS on short tandem repeats identifies genetic mechanisms in Alzheimer's disease.

First systematic GWAS on short tandem repeats (STR) in Alzheimer's disease, UK Biobank ~330,000 individuals

Classical SNP-based GWAS overlook short tandem repeats (STRs), which are present in many functional genomic regions. This study conducts the first systematic STR GWAS in Alzheimer's disease (~330,000 UK Biobank individuals, imputed and WGS-genotyped STRs). Novel loci are identified (SNX32, WSB1) absent from SNP-GWAS, and specific STRs are found at the ABCA7, HLA-DRB1, and APOE loci, explaining 3% of heritability. The methodology is transferable to other neurodegenerative diseases.

Synthesis written by Geno'X. For the full original abstract, please refer to the source publication.

Including STRs in GWAS opens a part of the genome long inaccessible at scale—the methodological stakes are significant. STR associations at the APOE locus deserve particular attention for understanding underlying genetic mechanisms beyond APOE4 alone. Clinical translatability remains indirect at this stage.

Clinical impact: 1/3 · Evidence strength: 3/3 · Novelty: 2/2 · Sample size: 1/1 · Publication status: 1/1 → Total: 8/10