AND逻辑门的CRISPR/Cas9和杂交连锁反应系统用于精确的ctDNA检测
Tianliang Ji1,2, Yujia Zhang1, Yixiu Wang3
1School of Automation and Intelligent Sensing, School of Agriculture and Biology, State Key Laboratory of Synergistic Chem-Bio Synthesis, Shanghai Jiao Tong University, Shanghai, 200240, China.
Journal of nanobiotechnology
|December 13, 2025
概括
这项研究提出了一种新的方法,用于使用CRISPR/Cas9和HCR系统检测循环瘤DNA (ctDNA). 该方法提供了单核酸变异 (SNV) 的精确识别,以改善癌症诊断.
科学领域:
- 生物标志物发现发现
- 分子诊断学 分子诊断学
- 癌症研究 癌症研究
背景情况:
- 循环瘤DNA (ctDNA) 是液体活检中的重要生物标志物,用于非侵入性癌症检测和监测.
- 目前的ctDNA检测方法面临的挑战包括复杂性,数据分析困难和预放大假阳性.
- 在ctDNA中准确识别单核酸变异 (SNV) 对早期诊断,治疗指导和预后至关重要.
研究的目的:
- 开发一种用于ctDNA检测的新,高度特定和敏感的方法.
- 克服现有的ctDNA检测技术的局限性,特别是在区分单核酸突变方面.
- 为了能够在复杂的生物样本 (如血清) 中精确识别SNV.
主要方法:
- 将CRISPR/Cas9系统与杂交连锁反应 (HCR) 的集成是热放大.
- 实现 AND 逻辑门以增强特异性并最大限度地减少目标外效应.
- 在模拟的临床样本中检测单核酸变异 (SNV),如KRAS G12D.
主要成果:
- 对于ctDNA来说,检测极限低至1 fM.
- 在野生类型序列中,成功识别了具有0.1%低的等位基因分数的SNV.
- 通过在模拟样本中检测各种突变 (KRAS G12C,KRAS G12D,EGFR T790M,TP53 R273H) 证明了高特异性.
结论:
- 新的CRISPR/Cas9-HCR方法为精确的ctDNA检测提供了一种可靠的方法.
- AND 逻辑门显著提高了识别 SNV 的特异性和准确性.
- 这项技术为推进非侵入性癌症诊断和监测提供了前途.
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