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    • 52. 发明授权
    • Homogeneous detection of a target through nucleic acid ligand-ligand beacon interaction
    • 通过核酸配体 - 配体信标相互作用均匀检测靶
    • US06261783B1
    • 2001-07-17
    • US09581326
    • 2000-08-11
    • Sumedha JayasenaLarry Gold
    • Sumedha JayasenaLarry Gold
    • C12Q168
    • C07H21/00C12Q1/6818C12Q1/682Y10T436/143333C12Q2561/12C12Q2537/101
    • A method for detecting a target molecule in a test mixture suspected of containing said target molecule is described. The nucleic acid ligand capable of binding to the target molecule has a first sequence A and a second sequence B, which are partially complementary sequences that form an imperfect intramolecular duplex, which unwinds upon the binding of the target to the nucleic acid ligand. Sequences A and B are able to participate in extramolecular hybridization reactions only when the duplex is unwound. Three different cascade nucleic acids contain a first sequence and a second sequence, which are partially complementary sequences. At least one sequence is exactly complementary to A or B. The second sequence may be complementary to A or B, or may be a third sequence C, or its complement. The test mixture suspected of containing the target molecule is contacted with the nucleic acid ligand, causing the duplex of the nucleic acid ligand to unwind such that sequences A and B become available for extramolecular hybridization. This mixture is contacted with the first, second, and third cascade nucleic acids so that the unpaired A and B sequences triggers a cascade of intermolecular hybridization involving the cascade nucleic acids in which intermolecular hybridization takes place between A and its complement, B and its complement, and between C its complement, leading to the formation of a multimolecular hybridization complex. The presence of the multimolecular hybridization complex is then detected.
    • 描述了一种用于检测怀疑含有所述靶分子的试验混合物中的靶分子的方法。 能够结合靶分子的核酸配体具有第一序列A和第二序列B,它们是形成不完全分子内双链体的部分互补序列,其解离靶核酸与核酸配体的结合。 序列A和B只有当双链体解卷时才能参与分子内杂交反应。 三种不同的级联核酸含有第一序列和第二序列,其是部分互补序列。 至少一个序列与A或B完全互补。第二个序列可以与A或B互补,或者可以是第三个序列C或其补体。 怀疑含有靶分子的试验混合物与核酸配体接触,导致核酸配体的双链体解开,使得序列A和B可用于分子内杂交。 该混合物与第一级,第二级和第三级联核酸接触,使得不成对的A和B序列引发级联的分子间杂交,其涉及级联核酸,其中分子间杂交发生在A与其补体之间,B及其补体 ,和C之间的补体,导致形成多分子杂交复合物。 然后检测多分子杂交复合物的存在。