【摘 要】
:
对特异DNA序列及生物小分子的高灵敏度检测在疾病诊断等方面具有重要意义[1].DNA因其具有强大的并行运算能力及储存能力,被广泛的应用于分子器件、分子逻辑门的构建,有望为生物分析提供新平台[2].染料分子与四级子结合后其荧光会得到显著增强.基于此,我们设计了一种新颖的DNA分子机器,基于其自循环信号放大的特性发展了免标记、高灵敏检测DNA的新方法.该方法操作简单、不需要使用昂贵且易受影响的酶等,能
【机 构】
:
中国科学院长春应用化学研究所,长春市人民大街5625号,130022 中国科学院长春应用化学研究所
论文部分内容阅读
对特异DNA序列及生物小分子的高灵敏度检测在疾病诊断等方面具有重要意义[1].DNA因其具有强大的并行运算能力及储存能力,被广泛的应用于分子器件、分子逻辑门的构建,有望为生物分析提供新平台[2].染料分子与四级子结合后其荧光会得到显著增强.基于此,我们设计了一种新颖的DNA分子机器,基于其自循环信号放大的特性发展了免标记、高灵敏检测DNA的新方法.该方法操作简单、不需要使用昂贵且易受影响的酶等,能抵抗生物体液(如尿样)的干扰,在稀释的尿样中对目标DNA的检测仍然表现出良好的选择性.该方法可区分带有单碱基错配、双碱基错配以及三碱基错配的目标DNA序列,并可用于单碱基多态性分析.更重要的是,这种方法能区分嵌入在长链核酸中的完全互补目标DNA序列,具有很强的实际应用潜力.另外,利用铜离子破坏四级子结构从而减弱荧光信号,实现了对组氨酸、半胱氨酸的高灵敏、高选择性检测.并利用该传感体系构建了在分子水平难以实现的IMPLICATION逻辑门.
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