活力
DNA
衰老
生物
基因组DNA
分子生物学
人口
内科学
遗传学
医学
环境卫生
作者
Juulia Jylhävä,Tapio Kotipelto,Annika Raitala,Marja Jylhä,Antti Hervonen,Mikko Hurme
标识
DOI:10.1016/j.mad.2010.11.001
摘要
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.
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