高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (4): 625.doi: 10.7503/cjcu20141048

• 分析化学 • 上一篇    下一篇

基于脱氧核酶的无标记端粒酶检测新方法

范宏亮1,2, 张涛2(), 金伟2(), 金钦汉2   

  1. 1. 浙江省医学科学院卫生学研究所, 杭州 310013
    2. 浙江大学工业控制技术国家重点实验室, 智能系统与控制研究所, 分析仪器研究中心, 杭州 310058
  • 收稿日期:2014-11-28 出版日期:2015-04-10 发布日期:2015-03-27
  • 作者简介:联系人简介: 张 涛, 男, 博士, 副教授, 主要从事生化传感方向研究. E-mail: zhtao@zju.edu.cn. 金 伟, 男, 博士, 高级工程师, 主要从事光谱分析与分析仪器研究. E-mail: jinweimy@gmail.com
  • 基金资助:
    国家自然科学基金(批准号: 21275129, 31270907)和浙江省医学科学院博士基金(批准号: 2014KYA043)资助

Novel Label-free Assay of Telomerase Based on DNAzyme

FAN Hongliang1,2, ZHANG Tao2,*(), JIN Wei2,*(), JIN Qinhan2   

  1. 1. Department of Environmental Medicine, Institute of Hygiene, Zhejiang Academy of Medical Sciences,Hangzhou 310013, China
    2. Research Center for Analytical Instrumentation, Institute of Cyber-Systems and Control,State Key Laboratory of Industrial Control Technology, Zhejiang University, Hangzhou 310058, China
  • Received:2014-11-28 Online:2015-04-10 Published:2015-03-27
  • Contact: ZHANG Tao,JIN Wei E-mail:zhtao@zju.edu.cn;jinweimy@gmail.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.21275129, 31270907)

摘要:

设计了一种发卡型核酸探针, 结合脱氧核酶(DNAzyme)与支点介导链置换技术建立了一种检测端粒酶的新方法. 该发卡型探针通过阻碍G-四链体的形成来抑制DNAzyme的过氧化物酶活性. 当体系中的端粒酶引物TS被催化延伸后, 可以通过链置换反应破坏该发卡结构, 从而释放出自由的DNAzyme以催化过氧化氢氧化ABTS2-, 产生可被检测的吸收信号变化. 实验结果表明, 应用该方法可以检测低至500个Hela细胞等当量的端粒酶, 且该方法操作简单、 不需要荧光标记和复杂的表面修饰, 有望在肿瘤细胞端粒酶活性分析中获得广泛应用.

关键词: 端粒酶, 脱氧核酶, 辣根过氧化物酶, 信号放大, 支点介导链置换

Abstract:

A novel method for telomerase detection based on DNAzyme and toehold-mediated strand displacement was developed. Optimal designing of a hairpin probe ensured efficient inhibition of DNAzyme activity by preventing it from forming the G-quadruplex structure. After the substrate TS was elongated by telomerase, the original hairpin structure could be destroyed through toehold-mediated strand displacement, so that the free DNAzyme was released, which catalyzed the oxidation of ABTS2- to generate an absorbance increase at 415 nm. The results indicated that the proposed method could detect the telomerase as low as 500 Hela cells equi-valent. Besides, this method is simple and requires no fluorescence labeling or complicated surface modification, and thus is expected to have a wide use in routine telomerase analysis of tumor cells.

Key words: Telomerase, DNAzyme, Horseradish peroxidase, Signal amplification, Toehold-mediated strand displacement

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