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Comprehensive human cell-type methylation atlas reveals origins of circulating cell-free DNA in health and disease

机译:全面的人类细胞型甲基化地图集揭示了健康与疾病中循环的无细胞DNA的起源

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Methylation patterns of circulating cell-free DNA (cfDNA) contain rich information about recent cell death events in the body. Here, we present an approach for unbiased determination of the tissue origins of cfDNA, using a reference methylation atlas of 25 human tissues and cell types. The method is validated using in silico simulations as well as in vitro mixes of DNA from different tissue sources at known proportions. We show that plasma cfDNA of healthy donors originates from white blood cells (55%), erythrocyte progenitors (30%), vascular endothelial cells (10%) and hepatocytes (1%). Deconvolution of cfDNA from patients reveals tissue contributions that agree with clinical findings in sepsis, islet transplantation, cancer of the colon, lung, breast and prostate, and cancer of unknown primary. We propose a procedure which can be easily adapted to study the cellular contributors to cfDNA in many settings, opening a broad window into healthy and pathologic human tissue dynamics.
机译:循环的无细胞DNA(cfDNA)的甲基化模式包含有关体内最近细胞死亡事件的丰富信息。在这里,我们介绍了一种使用25种人体组织和细胞类型的参考甲基化图谱无偏确定cfDNA组织起源的方法。使用计算机模拟以及已知比例的来自不同组织来源的DNA的体外混合物验证了该方法。我们显示健康供体的血浆cfDNA源自白细胞(55%),红细胞祖细胞(30%),血管内皮细胞(10%)和肝细胞(1%)。患者的cfDNA解卷积揭示了与败血症,胰岛移植,结肠癌,肺癌,乳腺癌和前列腺癌以及未知原发癌的临床发现相符的组织贡献。我们提出了一种程序,可以很容易地使其适应许多环境下研究cfDNA的细胞,从而为健康和病理性人体组织动力学打开了广阔的窗口。

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