Journal
MECHANISMS OF AGEING AND DEVELOPMENT
Volume 130, Issue 4, Pages 234-239Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.mad.2008.12.003
Keywords
Aging; Methylation; Repetitive elements; Epigenetics; Pryrosequencing
Categories
Funding
- National Institute of Environmental Health Sciences (NIEHS) [ES015172-01, ES00002]
- Environmental Protection Agency (EPA) [EPA 883241601, 8827353]
- CARIPLO Foundation [2007-5469]
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Loss of genomic DNA methylation has been found in a variety of common human age-related diseases. Whether DNA methylation decreases over time as individuals age is unresolved. We measured DNA methylation in 1097 blood DNA samples from 718 elderly subjects between 55 and 92 years of age (1-3 samples/subjects), who have been repeatedly evaluated over an 8-year time span in the Boston area Normative Aging Study. DNA methylation was measured using quantitative PCR-Pyrosequencing analysis in Alu and LINE-1 repetitive elements, heavily methylated sequences with high representation throughout the human genome. Age at the visit was negatively associated with Alu element methylation (beta = -0.12 %5 mC/year, p = 0.0005). A weaker association was observed with LINE-1 elements (beta = -0.06 %5 mC/year, p = 0.049). We observed a significant decrease in average Alu methylation over time, with a -0.2 %5 mC change (p = 0.012) compared to blood samples collected up to 8 years earlier. The longitudinal decline in Alu methylation was linear and highly correlated with time since the first measurement (beta = -0.089 %5 mC/year, p < 0.0001). In contrast, average LINE-1 methylation did not vary over time [p = 0.51]. Our results demonstrate a progressive loss of DNA methylation in repetitive elements dispersed throughout the genome. (C) 2008 Elsevier Ireland Ltd. All rights reserved.
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