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Updated: Feb 24, 2026

Genome-wide Purification of Extrachromosomal Circular DNA from Eukaryotic Cells

Genome-wide Purification of Extrachromosomal Circular DNA from Eukaryotic Cells

Published on: April 4, 2016

增强额外染色体循环DNA丰富和放大,以解决复制物之间极其低的重叠问题

Charles M Burnham¹, Alongkorn Kurilung², Visanu Wanchai²

¹Department of Biomedical Informatics, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR, USA; Department of Physiology and Cell Biology, University of Arkansas for Medical Sciences, Little Rock, AR, USA; Department of Pharmacology and Toxicology, College of Medicine, University of Arkansas for Medical Sciences.

The Journal of biological chemistry

|February 22, 2026

概括

这项研究通过优化Circle-seq方法来增强染色体外循环DNA (eccDNA) 检测. 修订后的协议显著增加了复制品中的eccDNA重叠,改善了瘤特征识别.

科学领域:

基因组学就是基因组学.
分子生物学分子生物学
癌症研究癌症研究

背景情况:

超染色体圆形DNA (eccDNA) 存在于所有真核生物中,但样本重叠很少,这表明检测方法的局限性.
现有的eccDNA检测方法缺乏可复制性,阻碍了对eccDNA生物学和临床相关性的充分理解.

研究的目的:

优化Circle-seq协议以实现更强大的和可复制的eccDNA检测.
调查实验程序对样本之间的eccDNA重叠的影响.

主要方法:

优化Circle-seq通过减少手术时间和增加外核酶V活性来实现线性DNA消化.
利用CRISPR-Cas9进行线粒体线性化,并改进了滚动圆放大 (RCA) 参数.
将修订后的方法应用于人类癌症细胞系和异种移植模型.

主要成果:

优化了RCA,具有特定的原始度和基因组DNA输入,改善了用于长读序列的连合体生成.
修订后的方法在复制品中检测到的eccDNA中实现了>50%的重叠,这与之前的<1%重叠相比是显著的改善.
在所有复制品中确定了eccDNA中一致的致癌特征.

结论:

优化的Circle-seq协议为eccDNA分析提供了一种标准化和可重复的方法.
增强的eccDNA检测促进了对eccDNA生物学及其在癌症中的作用的理解.
这种改进的方法有可能在癌症诊断和治疗中得到临床应用.

关键词:

克里斯普尔-Cas9是什么意思外核酶V的使用方法染色体外圆形DNA (eccDNA) 是一种长读序列的测序方式它们的重叠.头头头头是什么意思滚动圈放大器 (RCA) 是一个

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