The diverse origins of circulating cell‐free DNA in the human body: a critical re‐evaluation of the literature

表观遗传学 生物 计算生物学 机制(生物学) 生物信息学 鉴定(生物学) 胎儿游离DNA 基因 遗传学 植物 认识论 哲学 胎儿 产前诊断 怀孕
作者
Janine Aucamp,Abel J. Bronkhorst,Christoffel P. S. Badenhorst,P. J. Pretorius
出处
期刊:Biological Reviews [Wiley]
卷期号:93 (3): 1649-1683 被引量:204
标识
DOI:10.1111/brv.12413
摘要

ABSTRACT Since the detection of cell‐free DNA (cfDNA) in human plasma in 1948, it has been investigated as a non‐invasive screening tool for many diseases, especially solid tumours and foetal genetic abnormalities. However, to date our lack of knowledge regarding the origin and purpose of cfDNA in a physiological environment has limited its use to more obvious diagnostics, neglecting, for example, its potential utility in the identification of predisposition to disease, earlier detection of cancers, and lifestyle‐induced epigenetic changes. Moreover, the concept or mechanism of cfDNA could also have potential therapeutic uses such as in immuno‐ or gene therapy. This review presents an extensive compilation of the putative origins of cfDNA and then contrasts the contributions of cellular breakdown processes with active mechanisms for the release of cfDNA into the extracellular environment. The involvement of cfDNA derived from both cellular breakdown and active release in lateral information transfer is also discussed. We hope to encourage researchers to adopt a more holistic view of cfDNA research, taking into account all the biological pathways in which cfDNA is involved, and to give serious consideration to the integration of in vitro and in vivo research. We also wish to encourage researchers not to limit their focus to the apoptotic or necrotic fraction of cfDNA, but to investigate the intercellular messaging capabilities of the actively released fraction of cfDNA and to study the role of cfDNA in pathogenesis.
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