Causal association of education attainment with aging and cardiac death: Evidence from Mendelian randomization analysis.
Level 3 - non-randomized controlled study
Mendelian randomization using summary-level genetic data (observational instrumental variable design)
PubMed 41366980 · doi:10.1097/MD.0000000000046395
What was done
A two-sample Mendelian randomization (MR) study was conducted using publicly available genome-wide association study (GWAS) summary-level data from individuals of European ancestry. The authors assessed the potential causal effect of educational attainment (exposure) on biological aging markers (frailty index, GrimAge acceleration, telomere length) and cardiac death (outcomes). The primary analysis used the random-effects inverse-variance weighted (IVW) method. Sensitivity analyses included the MR-Egger intercept test for pleiotropy, Cochran's Q test for heterogeneity, and a leave-one-out approach.
What was found
Genetically predicted educational attainment was significantly associated with: - Reduced frailty index: OR = 0.846 (95% CI: 0.815 to 0.878; P = 2.23 × 10⁻¹⁸) - Reduced GrimAge acceleration: OR = 0.523 (95% CI: 0.384 to 0.710; P = 3.37 × 10⁻⁵) - Reduced cardiac death: OR = 0.997 (95% CI: 0.996 to 0.999; P = 1.28 × 10⁻³) - Increased telomere length: OR = 1.043 (95% CI: 1.021 to 1.068; P = 8.73 × 10⁻⁵) No significant single nucleotide polymorphism heterogeneity was observed, and MR-Egger intercept testing indicated no significant pleiotropy (P > .05).
Why it matters
This study provides genetic instrumental variable evidence supporting a protective association of educational attainment against biological aging and cardiac mortality, helping reduce confounding present in standard observational studies.
Limits
The abstract does not report the total participant sample sizes or specific GWAS cohorts used. The analysis is limited to individuals of European ancestry, restricting generalizability. The effect size on cardiac death is very small (OR 0.997). Inherent MR limitations, such as residual horizontal pleiotropy or canalization, cannot be entirely excluded.
Cited by
- supports Higher educational attainment is positively correlated with longer leukocyte telomere length.