Measures of biological age based on blood DNA methylation, referred to as age acceleration (AA), have been developed. We examined whether AA was associated with health risk factors and overall and cause-specific mortality. At baseline (1990-1994), blood samples were drawn from 2818 participants in the Melbourne Collaborative Cohort Study. DNA methylation was determined using the Illumina HM450K array. Mixed-effects models were used to examine the association of AA with health risk factors. Cox models were used to assess the association of AA with mortality. A total of 831 deaths were observed over a median 10.7 years of follow-up. Associations of AA were observed with male sex, Greek ethnicity, smoking, obesity, diabetes, lower education, and meat intake. AA measures were associated with increased mortality, and this was only partly accounted for by known determinants of health (attenuation of HRs by 20-40%). Weak evidence of heterogeneity in the association was observed by sex (p=0.06) and cause of death (p=0.07) but not by other factors. DNA-methylation-based AA measures are associated with several major health risk factors, but these do not fully explain the association between AA and mortality. Future research should investigate what genetic and environmental factors determine AA.
Association of DNA Methylation-Based Biological Age with Health Risk Factors, and Overall and Cause-Specific Mortality
Baglietto, Laura;
2017-01-01
Abstract
Measures of biological age based on blood DNA methylation, referred to as age acceleration (AA), have been developed. We examined whether AA was associated with health risk factors and overall and cause-specific mortality. At baseline (1990-1994), blood samples were drawn from 2818 participants in the Melbourne Collaborative Cohort Study. DNA methylation was determined using the Illumina HM450K array. Mixed-effects models were used to examine the association of AA with health risk factors. Cox models were used to assess the association of AA with mortality. A total of 831 deaths were observed over a median 10.7 years of follow-up. Associations of AA were observed with male sex, Greek ethnicity, smoking, obesity, diabetes, lower education, and meat intake. AA measures were associated with increased mortality, and this was only partly accounted for by known determinants of health (attenuation of HRs by 20-40%). Weak evidence of heterogeneity in the association was observed by sex (p=0.06) and cause of death (p=0.07) but not by other factors. DNA-methylation-based AA measures are associated with several major health risk factors, but these do not fully explain the association between AA and mortality. Future research should investigate what genetic and environmental factors determine AA.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
