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    • 2. 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。
    • 3. 发明授权
    • Detection of nucleic acids using G-quartets
    • 使用G四重奏检测核酸
    • US5691145A
    • 1997-11-25
    • US703755
    • 1996-08-27
    • J. Bruce PitnerGlenn P. VonkJames G. Nadeau
    • J. Bruce PitnerGlenn P. VonkJames G. Nadeau
    • G01N33/58C07H21/04C12N15/09C12Q1/68G01N21/78C07H21/02C12P19/34
    • C12Q1/6818Y10S436/80Y10S436/805Y10T436/143333
    • Oligonucleotides which form G-quartet structures have been found to be useful in fluorescence assays to detect a selected nucleic acid sequence. When one end of the oligonucleotide is labeled with a donor fluorophore and the other end is labeled with an acceptor dye, the folding of the molecule in the G-quartet structure brings the donor-acceptor pair into close proximity, allowing an interaction between the two labels which results in quenching of donor fluorescence or a change in other fluorescence properties which are the result of the interaction of two dyes in close proximity. The G-quartet structure unfolds upon hybridization to its complementary sequence, increasing the distance between the two dye labels. This results in decreased donor quenching or a change in another proximity-related fluorescence parameter. The associated increase in donor fluorescence intensity or the change in another fluorescence parameter may be monitored as an indication of the presence of a selected nucleic acid sequence. Alternatively, in some cases a decrease in acceptor fluorescence may be monitored as an indication of the presence of the selected nucleic acid sequence when the acceptor is also a fluorophore.
    • 已经发现形成G-四重结构的寡核苷酸可用于荧光测定以检测所选择的核酸序列。 当寡核苷酸的一端用供体荧光团标记,另一端用受体染料标记时,分子在G四重结构中的折叠使供体 - 受体对紧密接近,允许两者之间的相互作用 导致供体荧光猝灭的标记或其他荧光性质的变化,这两种染料是两种染料相互作用的结果。 G-四重结构在与其互补序列杂交时展开,增加两个染料标记之间的距离。 这导致供体猝灭减少或另一邻近相关荧光参数的变化。 可以监测供体荧光强度的相关增加或另一荧光参数的变化作为选择的核酸序列的存在的指示。 或者,在一些情况下,当受体也是荧光团时,可以监测受体荧光的降低作为选择的核酸序列的存在的指示。