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    • 5. 发明授权
    • Amplification of midivariant DNA templates
    • 多变量DNA模板的扩增
    • US5407798A
    • 1995-04-18
    • US15249
    • 1993-02-05
    • Richard A. MartinelliJeffrey J. DonahueJohn T. Unger
    • Richard A. MartinelliJeffrey J. DonahueJohn T. Unger
    • C07H21/04C12N15/09C12Q1/68C12P19/34
    • C12Q1/682C12Q1/6867
    • New methods are provided for the amplification of a midivariant DNA containing an inserted target specific nucleic acid sequence(s) to enable detection of the presence of a target nucleic acid sequence in a test sample. One method employs midivariant DNA as a template for the synthesis of RNA catalyzed by QB replicase. Two midivariant DNA/probe conjugates including a nonreplicable portion of midivariant DNA and a target specific nucleic acid sequence (probe) are described. An amplification method including the steps of hybridization and ligation of the midivariant DNA/probe conjugates followed by replication of the DNA template has enabled detection of less than 200 template molecules. In a modified amplification method one of the midivariant DNA/probe conjugates further includes a RNA polymerase promoter sequence to enable transcription of the midivariant DNA template into RNA. The sequential ligation-transcription-replication method enables the detection of a single template molecule. The detectable molecule(s) are indicative of the presence of the target nucleic acid sequences in the test sample.
    • 提供了用于扩增含有插入的靶特异性核酸序列的多变性DNA的新方法,以便能够检测测试样品中靶核酸序列的存在。 一种方法采用半变体DNA作为模板,用于合成由QB复制酶催化的RNA。 描述了包括不可复制部分的变形DNA和靶特异性核酸序列(探针)的两个变异型DNA /探针缀合物。 包括以下步骤的扩增方法,其中杂交和连接半变异DNA /探针缀合物,随后DNA模板的复制使得能够检测到少于200个模板分子。 在修饰的扩增方法中,其中一个变体DNA /探针结合物进一步包括RNA聚合酶启动子序列,以使得能够将该变体DNA模板转录成RNA。 顺序连接 - 转录复制方法能够检测单个模板分子。 可检测分子指示测试样品中靶核酸序列的存在。