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端,并引入新的错配碱基 C,结果发现,当 crRNA 的 112461
间隔序列的5′末端与 野生型 RNA之间有两个错配 [6] TAMBE A,EAST⁃SELETSKY A,KNOTT G J,et al. RNA
碱基,而与变异体 RNA 之间只有一个错配碱基时, binding and HEPN⁃nuclease activation are decoupled in
可以有效地区分野生型和变异体。另外,本研究发 CRISPR⁃cas13a[J]. Cell Rep,2018,24(4):1025-1036
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现 crRNA 浓度与 CRISPR/Cas13a 检测强度呈正相
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关,在 0.05~0.25 μmol/L 范围内,crRNA 浓度越高,
147-155
CRISPR/Cas13a检测强度越大。
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通过混合 TP53 野生型和 R248W 变异体,构建 nucleic acid detection:principles and methods[J]. Bio⁃
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CRISPR/Cas13a 方法最低可检出突变频率为 0.01% [9] HABIBZADEH P,MOFATTEH M,SILAWI M,et al. Mo⁃
的 TP53 R248W 变异体(1×10 copies),与同类型报 lecular diagnostic assays for COVID⁃19:an overview[J].
3
道检测的灵敏度相当 [13] 。最后,通过对模拟血浆 Crit Rev Cl Lab Sci,2021,58(6):1-20
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变异体,为下一步临床样本的检测提供重要依据。
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综上所述,本研究建立的CRISPR/Cas13a检测方
TECTR:CRISPR⁃cas systems as potential rapid diagnos⁃
法能够快速、灵敏且高效地检出 TP53 R248W 变异 tic tools for emerging infectious diseases[J]. J Clin Micro⁃
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大帮助。另外,本研究建立的方法学也可应用于其 CRISPR/Cas system in molecular detection[J]. J Cell
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