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    • 5. 发明授权
    • Detection of nucleic acids by fluorescence quenching
    • 通过荧光猝灭检测核酸
    • US6054279A
    • 2000-04-25
    • US120916
    • 1998-07-20
    • James G. NadeauJ. Bruce PitnerJames L. SchramC. Preston LinnGlenn P. VonkG. Terrance Walker
    • James G. NadeauJ. Bruce PitnerJames L. SchramC. Preston LinnGlenn P. VonkG. Terrance Walker
    • G01N21/64C07H21/00C12N15/09C12Q1/68G01N33/58C21Q1/68
    • C12Q1/6818C12Q1/6825
    • Single-stranded signal primers are modified by linkage to two dyes which form a donor/acceptor dye pair. The two dyes are positioned in sufficiently close spatial proximity on the signal primer that the fluorescence of the first dye is quenched by the second dye. The signal primer may further comprise a restriction endonuclease recognition site (RERS) between the two dyes. As the signal primer is initially single-stranded and remains single-stranded in the absence of target, the restriction endonuclease recognition site is not cleavable or nickable by the restriction endonuclease. In the presence of target, however, signal primer and the restriction endonuclease recognition site are rendered double-stranded and cleavable or nickable by the restriction endonuclease. Cleavage or nicking separates the two dyes and a change in fluorescence due to decreased quenching is detected as an indication of the presence of the target sequence or of target sequence amplification.
    • 通过连接到形成供体/受体染料对的两种染料来修饰单链信号引物。 这两种染料位于信号引物足够接近的空间上,第一种染料的荧光被第二种染料淬灭。 信号引物还可以包含两种染料之间的限制性内切核酸酶识别位点(RERS)。 由于信号引物最初是单链的,并且在不存在靶标的情况下保持单链,限制性内切核酸酶识别位点不受限制性内切核酸酶的切割或切割。 然而,在靶的存在下,信号引物和限制性内切核酸酶识别位点被限制性内切核酸酶双链和切割或切割。 切割或切口分离两种染料,并且由于猝灭降低引起的荧光变化被检测为目标序列或靶序列扩增的存在的指示。
    • 6. 发明授权
    • Detection of nucleic acids by fluorescence quenching
    • 通过荧光猝灭检测核酸
    • US5958700A
    • 1999-09-28
    • US237510
    • 1999-01-26
    • James G. NadeauJ. Bruce PitnerC. Preston LinnJames L. Schram
    • James G. NadeauJ. Bruce PitnerC. Preston LinnJames L. Schram
    • G01N33/50C12N15/09C12Q1/68G01N33/566C07H21/04C12P19/34
    • C12Q1/6827C12Q1/6818C12Q1/6858
    • A detector oligonucleotide having a sequence which forms an intramolecularly base-paired secondary structure is described for use in detecting nucleic acid target sequences and target sequence amplification. The detector oligonucleotide is further modified by linkage to two dyes which form a donor/acceptor dye pair. The two dyes are positioned on the detector oligonucleotide such that they are in close spatial proximity in the base-paired, folded secondary structure, thereby causing quenching of donor fluorescence. The detector oligonucleotide may optionally further comprise a restriction endonuclease recognition site (RERS) which remains partially or entirely single-stranded in the base-paired secondary structure. The RERS is flanked by the two dyes. In the presence of target, the base-paired secondary structure is unfolded or linearized, increasing the distance between the donor and acceptor dyes and causing a change in fluorescence of the donor and/or the acceptor. If an RERS is present, it is rendered double-stranded in the presence of target, allowing cleavage or nicking by a restriction endonuclease and separation of the two dyes onto separate nucleic acid fragments. This may further contribute to the magnitude of the change in fluorescence.
    • 描述了具有形成分子内碱基配对二级结构的序列的检测器寡核苷酸用于检测核酸靶序列和靶序列扩增。 通过连接到形成供体/受体染料对的两种染料进一步修饰检测器寡核苷酸。 两种染料位于检测器寡核苷酸上,使得它们在碱基配对的折叠的二级结构中处于紧密的空间接近处,由此引起供体荧光的猝灭。 检测器寡核苷酸可以任选地进一步包含限制性内切核酸酶识别位点(RERS),所述限制性内切核酸酶识别位点在碱基配对二级结构中部分或全部保持单链。 RERS侧面有两种染料。 在靶的存在下,碱基配对的二级结构被展开或线性化,增加供体和受体染料之间的距离并引起供体和/或受体的荧光变化。 如果存在RERS,则在靶的存在下使其成为双链,允许通过限制性内切核酸酶切割或切割并将两种染料分离到单独的核酸片段上。 这可能进一步有助于荧光变化的大小。