使用液体染色学对DNA混合物的测序――后活性等离子电子脱离解离质谱法
Takashi Baba1, Kaoru Karasawa2
1Sciex: 71 Four Valley Dr., Concord, Ontario L4K 4 V8, Canada.
Analytical chemistry
|August 15, 2025
概括
我们通过对电荷降低物种进行碰撞后激活来增强对DNA测序的电子脱离解离 (EDD) 灵敏度. 这种方法显著提高了片段强度,并实现了DNA混合物的100%序列覆盖率.
科学领域:
- 分析化学 分析化学
- 质谱测量质量谱测量
- 生物化学 生物化学
背景情况:
- 寡核酸的快速电子脱离解离 (EDD) 显示出对测序的希望,但由于主导的电荷减小物种 (CRS),其碎片强度较弱.
- 在液体染色学-并联质谱学 (LC-MS/MS) 工作流程中用于DNA混合物的血EDD (pEDD) 之前的应用,与传统方法相比,序列覆盖率较低.
研究的目的:
- 为了提高血EDD (pEDD) 对寡核酸分析的灵敏度.
- 用质谱测量来改善DNA测序覆盖范围.
主要方法:
- 研究了对在pEDD过程中产生的减电物种 (CRS1和CRS2) 碰撞后活化 (PA) 的应用.
- 在各种充电状态中为CRS1优化后激活能量.
- 应用优化后活化等离子体EDD (PA-pEDD) 在液体染色体数据依赖获取 (LC-DDA) MS/MS工作流程中用于DNA混合物.
主要成果:
- 与预期相反,CRS1的解离能值与前体相似.
- 与非激活的pEDD相比,优化的PA-pEDD显著提高了碎片强度.
- 使用优化PA-pEDD的LC-DDA-MS/MS工作流实现了混合物内的众多DNA分子100%的序列覆盖.
结论:
- 碰撞后激活是一种有效的策略,可以提高血EDD对寡核酸分析的灵敏度.
- PA-pEDD显著改善了碎片离子的丰富性,克服了以前的pEDD方法的局限性.
- 与PA-pEDD一起开发的LC-DDA-MS/MS方法为DNA测序提供了一种高度敏感和全面的方法.
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