Journal
EBIOMEDICINE
Volume 40, Issue -, Pages 710-716Publisher
ELSEVIER
DOI: 10.1016/j.ebiom.2019.01.040
Keywords
Epigenetic clock; DNA methylation; Aging; Heritability; Sources of variation
Funding
- NIH [R01 AG04563, AG10175, AG028555]
- MacArthur Foundation Research Network on Successful Aging
- Swedish Council for Working Life and Social Research (FAS/FORTE) [97: 0147: 1B, 2009-0795]
- Swedish Research Council [825-2007-7460, 825-2009-6141, 521-2013-8689, 201503255]
- JPND/Swedish Research Council [2015-06796]
- FORTE [20132292]
- Loo & Hans Osterman Foundation
- Foundation for Geriatric Diseases
- Magnus Bergwall Foundation
- Strategic Research Program in Epidemiology at Karolinska Institutet
- VELUX FOUNDATION
- U.S. National Institute on Aging [P01-AG08761]
- European Union's Seventh Framework Programme (FP7/2007-2011) [259679]
- Danish National Program for Research Infrastructure 2007 [9-063256]
- Swedish Research Council [2015-06796] Funding Source: Swedish Research Council
- Vinnova [2015-06796] Funding Source: Vinnova
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Background: Measures based on DNA methylation, epigenetic clocks, have recently gained attraction as predictors of mortality and age-related pathologies. However, the origins of variation in these measures are not well understood. Methods: In a pooled sample of 104 Swedish and Danish twin pairs, we estimated, at the mean age of 70 (baseline) and 79 years (follow-up), the genetic and environmental influences on the Horvath and Levine clocks. Findings: A model incorporating additive genetic (A) and person-specific environmental (E) influences best explained the variation in both clocks. Heritability was estimated at 55% at baseline and at 51% at follow-up for the Horvath clock and 34% at baseline and 41% at follow-up for the Levine clock. For the Horvath clock, new sources of A influences emerged at follow-up, whereas for the Levine clock, the same A influences accounted for the genetic variance at both measurement occasions. The cross-time phenotypic correlations, 0.52 for the Horvath clock and 0.36 for the Levine clock, were mediated primarily by genetic factors, whereas the person-specific environmental factors were completely different at the two measurement occasions. Interpretation: For both clocks, new sources of person-specific environmental influences emerge with age. The epigenetic clocks might thus be responsive to new environmental stimuli even at old age. (C) 2019 The Authors. Published by Elsevier B.V.
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