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    • 1. 发明公开
    • Base specific cleavage of methylation-specific amplification products in combination with mass analysis
    • Basenspezifische Spaltung methylierungsspezifischer Amplifikationsprodukte in Kombination mit Massenanalyse
    • EP2395098A1
    • 2011-12-14
    • EP11006184.3
    • 2005-03-24
    • Sequenom, Inc.
    • Ehrich, MathiasVan den Boom, Dirk Johannes
    • C12P19/34C12Q1/68
    • C12Q1/6848C12Q1/6858C12Q2565/627C12Q2523/125C12Q2525/143
    • The present invention relates to a method of distinguishing between a false positive methylation specific amplification and a true methylation specific amplification, comprising the steps of: (a) treating a target nucleic acid molecule with a reagent that modifies an unmethylated selected nucleotide to produce a different nucleotide; (b) contacting the treated target nucleic acid molecule with a methylation state specific primer complementary to a first target nucleic acid region containing one or more of the selected nucleotides; (c) treating the contacted target nucleic acid molecule under nucleic acid synthesis conditions; (d) treating the synthesized products under base specific cleavage conditions; and (e) detecting the mass of the cleaved products, wherein: a change in mass of one or more cleaved products compared to a reference mass indicates that a nucleotide locus in a second region in a target is methylated, wherein the second region does not overlap with the first region, whereby presence of one or more methylated loci in the second region confirms true methylation specific amplification.
    • 本发明涉及区分假阳性甲基化特异性扩增和真正甲基化特异性扩增的方法,其包括以下步骤:(a)用修饰未甲基化的选择核苷酸的试剂处理靶核酸分子以产生不同的 核苷酸; (b)使经处理的靶核酸分子与含有一个或多个所选核苷酸的第一靶核酸区域互补的甲基化状态特异性引物接触; (c)在核酸合成条件下处理接触的靶核酸分子; (d)在碱性特异性裂解条件下处理合成的产物; 和(e)检测切割产物的质量,其中:与参考质量相比,一种或多种切割产物的质量变化表明靶标中第二区域中的核苷酸位点是甲基化的,其中第二区域不 与第一区域重叠,由此第二区域中一个或多个甲基化位点的存在证实了真正的甲基化特异性扩增。