Article Synopsis

  • The study investigates genetic variants linked to early-onset ischemic stroke (EOS) in individuals aged 18-59, contrasting with previous research focused on late-onset stroke (LOS).
  • Researchers conducted a meta-analysis involving 16,730 EOS cases and 599,237 controls to identify significant genetic associations and compared results between EOS and LOS.
  • Findings include two genetic variants associated with blood subgroups that show a stronger connection to EOS than LOS, indicating that genetic factors promoting blood clotting are particularly influential in early-onset cases.

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Article Abstract

Background And Objectives: Current genome-wide association studies of ischemic stroke have focused primarily on late-onset disease. As a complement to these studies, we sought to identify the contribution of common genetic variants to risk of early-onset ischemic stroke.

Methods: We performed a meta-analysis of genome-wide association studies of early-onset stroke (EOS), ages 18-59 years, using individual-level data or summary statistics in 16,730 cases and 599,237 nonstroke controls obtained across 48 different studies. We further compared effect sizes at associated loci between EOS and late-onset stroke (LOS) and compared polygenic risk scores (PRS) for venous thromboembolism (VTE) between EOS and LOS.

Results: We observed genome-wide significant associations of EOS with 2 variants in , a known stroke locus. These variants tag blood subgroups O1 and A1, and the effect sizes of both variants were significantly larger in EOS compared with LOS. The odds ratio (OR) for rs529565, tagging O1, was 0.88 (95% confidence interval [CI]: 0.85-0.91) in EOS vs 0.96 (95% CI: 0.92-1.00) in LOS, and the OR for rs635634, tagging A1, was 1.16 (1.11-1.21) for EOS vs 1.05 (0.99-1.11) in LOS; -values for interaction = 0.001 and 0.005, respectively. Using PRSs, we observed that greater genetic risk for VTE, another prothrombotic condition, was more strongly associated with EOS compared with LOS ( = 0.008).

Discussion: The locus, genetically predicted blood group A, and higher genetic propensity for venous thrombosis are more strongly associated with EOS than with LOS, supporting a stronger role of prothrombotic factors in EOS.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9620803PMC
http://dx.doi.org/10.1212/WNL.0000000000201006DOI Listing

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