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第42卷第8期                           南京医科大学学报(自然科学版)
                  2022年8月                   Journal of Nanjing Medical University(Natural Sciences)     ·1119 ·


               ·基础研究·

                基于CRISPR/Cas13a技术检测肿瘤驱动基因TP53 R248W的研究



                邝振展 ,肖 斌 ,孙朝晖 ,罗 镕 ,何洁雯 ,李林海                   2*
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                1 中国人民解放军南部战区总医院检验科,广东                广州   510010;广州医科大学附属第六医院(清远市人民医院)检验医学部,
                广东   清远    511518;广州医科大学金域检验学院,广东              广州    510180;广州南方学院云康医学与健康学院,广东                广
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                州 510970
               [摘   要] 目的:建立一种基于 CRISPR/Cas13a 的 TP53 R248W 变异体的快速检测技术。方法:根据 Over⁃lap PCR 技术,以
                TP53野生型质粒为模板构建TP53 R248W变异体质粒;对TP53R248W变异体扩增产物大小,扩增反应条件及crRNA长度和浓
                度进行优化,初步建立基于CRISPR/Cas13a的R248W变异体快速检测方法;利用不同突变率TP53 R248W变异体及模拟血浆
                ctDNA,评价 CRISPR/Cas13a 方法的检测灵敏度。结果:建立的 CRISPR/Cas13a 方法成功检测出产物大小为 368 bp 的 TP53
                R248W片段;在0.05~0.25 μmol/L浓度范围内,crRNA浓度越高,检测结果相对荧光值越高;该方法检测TP53 R248W变异体的
                灵敏度为1×10 拷贝/μL,最低可以检测出突变率为0.01%的变异体。结论:建立的CRISPR/Cas13a方法具有快速、简便、灵敏、
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                特异等优点,为组织和血浆中的TP53 R248W变异体的检测提供了新的技术手段。
               [关键词] CRISPR/Cas13a;TP53 R248W;crRNA;快速检测
               [中图分类号] R446.7                   [文献标志码] A                      [文章编号] 1007⁃4368(2022)08⁃1119⁃06
                doi:10.7655/NYDXBNS20220811


                Detection of tumor driver gene TP53 R248W by CRISPR/Cas13a

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                KUANG Zhenzhan ,XIAO Bin ,SUN Zhaohui ,LUO Rong ,HE Jiewen ,LI Linhai 2*
                1 Department of Clinical Laboratory,General Hospital of the Southern Theater Command of the People’s Liberation
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                Army,Guangzhou 510010;Department of Laboratory Medicine,the Sixth Affiliated Hospital of Guangzhou Medical
                University(Qingyuan People’s Hospital),Qingyuan 511518;Jinyu College of Laboratory Science,Guangzhou
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                Medical University,Guangzhou 510180;Yunkang School of Medicine and Health,Guangzhou Nanfang University,
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                Guangzhou 510970,China
               [Abstract] Objective:To establish a CRISPR/Cas13a based method for detecting TP53 R248W mutant molecules. Methods:TP53
                R248W mutant plasmid was constructed by Over⁃lap PCR using TP53 wild⁃type plasmid as template. The CRISPR/Cas13a method for
                the detection of TP53 R248W variant was initially established by optimizing the amplification product size,amplification technology,
                the length and concentration of crRNA. The sensitivity of CRISPR/Cas13a method was evaluated by TP53 R248W variants with
                different mutation rates and simulated plasma ctDNA. Results:The size of the amplified product detected by CRISPR/Cas13a was
                about 368 bp. The concentration of crRNA had influence upon the detection intensity of CRISPR/Cas13a. In the range of 0.05~0.25 μmol/L,
                the higher the concentration of crRNA,the higher the detection intensity of CRISPR/Cas13a was detected. The sensitivity of CRISPR/
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                Cas13a in detecting TP53 R248W variants was 10 copies/μL,and the minimum mutation rate was 0.01% . Conclusion:The
                established CRISPR/Cas13a method has the advantages of rapid,simple,sensitive and specific,and provides a new technology for the
                detection of TP53 R248W variant in tissues and plasma.
               [Key words] CRISPR/Cas13a;TP53 R248W;crRNA;rapid detection
                                                                            [J Nanjing Med Univ,2022,42(08):1119⁃1124]



               [基金项目] 全军保健专项科研课题(18BJZ4);广东省医学科学技术研究基金项目(B2019139);全军卫勤保障能力创新与生
                成项目(20WQO29);后勤科研开放项目(BLB19J009)
                ∗
                通信作者(Corresponding author),E⁃mail:mature303@126.com
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