期刊
MECHANISMS OF AGEING AND DEVELOPMENT
卷 132, 期 1-2, 页码 20-26出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.mad.2010.11.001
关键词
Aging; Cell-free DNA; Nonagenarians; Biomarker
资金
- Competitive Research Foundation of Pirkanmaa Hospital District
As a marker of cellular death, cell-free DNA (cf-DNA) has a utility in diagnosis and prognosis of various disorders. Since aging accompanies increased cellular senescence and death, we aimed to characterize potential age-related alterations in cf-DNA. The study population consisted of 12 nonagenarian women (participants in the Vitality 90+ Study) and 11 healthy control women (aged 22-37 years). Some of the nonagenarians (n = 8) were also recruited for follow-up after one year. cf-DNA was extracted using two different methods. Total cf-DNA was quantified directly in plasma and the amplifiable cf-DNA was assessed using quantitative PCR. Quality of cf-DNA was analysed with a DNA Chip assay. For all the quantification methods, the concentration of cf-DNA was significantly higher (p < 0.05) in nonagenarians as compared to controls. The quality of the cf-DNA also displayed a marked difference between nonagenarians and controls; a fragmented pattern or appearance of low molecular weight cf-DNA was observed in the majority of the nonagenarians, whereas in controls, cf-DNA was intact and had a quasi-genomic, high molecular weight appearance. In nonagenarians, the quality of cf-DNA appeared similar in the original and follow-up samples. We propose that some, as yet uncharacterized, aspects of aging are reflected in the appearance of cf-DNA. (C) 2010 Elsevier Ireland Ltd. All rights reserved.
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