DNA methylation GrimAge strongly predicts lifespan and healthspan.
Level 3 - non-randomized controlled study
Prospective cohort biomarker validation study across multiple clinical outcomes
PubMed 30669119 · doi:10.18632/aging.101684
What was done
The authors developed seven DNA methylation (DNAm)-based estimators of plasma proteins (including PAI-1 and GDF-15) alongside a DNAm surrogate for smoking pack-years. These surrogates were combined into a composite predictor of lifespan called DNAm GrimAge (expressed in units of years). Adjusting GrimAge for chronological age generated a measure of epigenetic age acceleration (AgeAccelGrim). The biomarker was evaluated for predicting time-to-event clinical outcomes and age-related traits using large-scale validation data from thousands of individuals.
What was found
DNAm GrimAge significantly predicted time-to-death (Cox regression P = 2.0E-75), time-to-coronary heart disease (Cox P = 6.2E-24), time-to-cancer (P = 1.3E-12), and age-at-menopause (P = 1.6E-12). It was also strongly related to computed tomography measures of fatty liver and excess visceral fat. AgeAccelGrim correlated with comorbidity count (P = 3.45E-17). Age-adjusted DNAm PAI-1 levels were associated with lifespan (P = 5.4E-28), comorbidity count (P = 7.3E-56), and type 2 diabetes (P = 2.0E-26). The abstract reports p-values but does not report effect sizes, hazard ratios, or confidence intervals.
Why it matters
GrimAge establishes a second-generation epigenetic clock framework by training DNA methylation algorithms on surrogate physiological plasma biomarkers and smoking rather than chronological age alone, substantially improving mortality and morbidity risk stratification.
Limits
The abstract does not provide exact participant counts (noted only as 'thousands of individuals'), hazard ratios, effect sizes, or confidence intervals. As an observational biomarker association study, it cannot demonstrate whether epigenetic alterations causally drive mortality or disease. Cohort demographics, ethnic diversity, and specific follow-up durations are omitted from the abstract.
Cited by
- partial A 2019 prospective study using the DNA GrimAge clock found that individuals with higher omega-3 intake had slowed age acceleration.