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突变选择放大滴滴数字PCR:一种新的单核酸变异检测试验,用于瘤和血样本中的TP53^R249S突变

Ling Hu¹, Yuan-Ye Ji², Peng Zhu³

¹Department of Clinical Laboratory, Fudan University Shanghai Cancer Center, Department of Oncology, Shanghai Medical School, Fudan University, Shanghai, 20032, China.

Analytica chimica acta

|July 27, 2024

概括

突变选择放大滴滴数字PCR (MSA-ddPCR) 提供了对低频基因突变的敏感检测. 这种新的方法在临床样本中准确量化单核酸变异 (SNV),性能优于现有技术.

科学领域:

分子生物学分子生物学
遗传学是一个遗传学.
生物技术是生物技术.

背景情况:

早期发现基因突变对于精准医学至关重要.
在临床样本中检测低拷贝突变DNA是具有挑战性的,因为野生类型的DNA丰富.

研究的目的:

开发和验证一种新型的定量策略,即突变选择放大滴滴数字PCR (MSA-ddPCR),用于分析低变异等位基因频率 (VAF) 的单核酸变异 (SNV).
评估MSA-ddPCR的性能与传统PCR和下一代测序 (NGS) 相比,用于临床样本分析.

主要方法:

优化MSA-ddPCR的原料度比率,回火温度和核酸放大修饰剂.
使用TP53^R249S和TP53^野生型 (TP53^WT) 等离子体DNA评估MSA-ddPCR的线性范围和精度.
应用MSA-ddPCR来分析TP53^R249S突变在血和甲固定嵌 (FFPE) 组织样本中,与安普利康高通量测序进行比较.

主要成果:

与传统的TaqMan-MGB PCR相比,MSA-ddPCR显示出突变型和野生型DNA之间的优异歧视.
该方法准确量化VAF低至0.01%,空白的极限为0.449副本μL (FAM) 和0.452副本μL (VIC).
在临床样本中观察到MSA-ddPCR和安普利康高通量测序之间的高度相关性,MSA-ddPCR提供更快的检测和更简单的数据分析.

结论:

MSA-ddPCR是一种高度敏感和准确的工具,用于在低VAF下对SNV进行定量分析.
该方法在灵敏度,速度和数据分析简单性方面超过现有的PCR和NGS技术.
MSA-ddPCR在临床实践中很容易实现,用于强大的突变基因检测.

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