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    • 11. 发明申请
    • Carry-Over Protection in Enzyme-Based Dna Amplification Systems Targeting Methylation Analysis
    • 基于甲基化分析的酶基Dna扩增系统中的保护
    • US20110027834A1
    • 2011-02-03
    • US12308149
    • 2007-06-08
    • Reimo TetznerDimo Dietrich
    • Reimo TetznerDimo Dietrich
    • C12P19/34C12N9/00C07H21/04
    • C12Q1/6848C12Q2525/131C12Q2523/125
    • The invention refers to a method for providing a decontaminated template nucleic acid for enzymatic amplification reactions suitable for DNA methylation analysis. This method is characterized by the following steps: a) incubating a nucleic acid with a chemical reagent or an enzyme-containing solution, whereby the unmethylated cytosine bases are converted into uracil bases, b) mixing the template nucleic acid from step a) with the components required for an enzyme-mediated amplification reaction, including at least two oligonucleotides, whereby at least one of said oligonucleotides comprises i) at least one sequence part that hybridizes with a sequence of the template nucleic acid to be amplified, and ii) at least one sequence part that constitutes a recognition site for a DNA cleaving enzyme that cleaves DNA downstream of said recognition site and c) adding to this mixture a DNA cleaving enzyme, which specifically binds to the at least one sequence part that is a recognition site, and d) incubating the mixture, whereby nucleic acids containing said recognition site for a DNA cleaving enzyme are degraded.
    • 本发明涉及一种用于提供适用于DNA甲基化分析的酶扩增反应的去污染模板核酸的方法。 该方法的特征在于以下步骤:a)将核酸与化学试剂或含酶溶液一起孵育,由此将未甲基化的胞嘧啶碱基转化成尿嘧啶碱基,b)将来自步骤a)的模板核酸与 酶介导的扩增反应所需的组分,包括至少两个寡核苷酸,其中至少一个所述寡核苷酸包含i)至少一个与待扩增的模板核酸序列杂交的序列部分,和ii)至少 构成用于切割所述识别位点下游的DNA的DNA切割酶的识别位点的一个序列部分,和c)向该混合物中加入特异性结合作为识别位点的至少一个序列部分的DNA切割酶,以及 d)孵育混合物,由此含有用于DNA切割酶的所述识别位点的核酸被降解。
    • 14. 发明申请
    • Method for the carry-over protection in DNA amplification systems targeting methylation analysis achieved by a modified pre-treatment of nucleic acids
    • 用于DNA扩增系统中的遗传保护的方法,其靶向通过核酸的修饰预处理实现的甲基化分析
    • US20060115835A1
    • 2006-06-01
    • US11248721
    • 2005-10-11
    • Reimo TetznerDimo Dietrich
    • Reimo TetznerDimo Dietrich
    • C12Q1/68C07H21/04C12P19/34
    • C12Q1/6876C12P19/34C12Q1/6806C12Q1/6827C12Q1/6848C12Q1/6883C12Q1/6886C12Q2600/156C12Q2523/125C12Q2521/531C12Q2531/113
    • Particular aspects provide methods for specific amplification of template DNA in the presence of potentially contaminating PCR products from previous amplification experiments. Particular embodiments comprise, in a first step, contacting DNA with a bisulfite solution, which sulfonates unmethylated (but not methylated) cytosines, resulting in cytosine deamination and generation of sulfonated uracil. Such sulfonation protects the template nucleic acid from being a target for the enzyme uracil-DNA-glycosylase (UNG), whereas any contaminating DNA, which contains unprotected unsulfonated or desulfonated uracils, is degraded enzymatically while the UNG is active. After UNG treatment and inactivation thereof, the sulfonated uracil bases are converted into uracil by desulfonation. Such aspects have substantial utility for decontamination of nucleic acid samples; e.g., for avoiding amplification of ‘carry over products’ in the context of DNA methylation analysis. In further aspects, the inventive methods can be generally used as simplified methods of bisulfite treatment.
    • 在以前的扩增实验中存在可能污染的PCR产物的情况下,特定方面提供用于特异性扩增模板DNA的方法。 具体实施方案包括在第一步中使DNA与亚硫酸氢盐溶液接触,所述亚硫酸氢盐溶液磺化非甲基化(但不是甲基化的)胞嘧啶,导致胞嘧啶脱氨基并产生磺化的尿嘧啶。 这种磺化保护模板核酸不是酶尿嘧啶-DNA-糖基化酶(UNG)的靶标,而任何含有未保护的未磺化或脱磺酸尿嘧啶的污染性DNA在UNG活性时被酶促降解。 在UNG处理和灭活后,通过脱磺酸将磺化的尿嘧啶碱基转化成尿嘧啶。 这些方面对于核酸样品的净化具有实质性的实用性; 例如,为了避免在DNA甲基化分析的上下文中“携带产物”的扩增。 在另外的方面,本发明的方法通常可以用作亚硫酸氢盐处理的简化方法。
    • 17. 发明申请
    • Compositions and Methods for Preventing Carry-Over Contamination in Nucleic Acid Amplification Reactions
    • 防止核酸扩增反应中携带污染的组合物和方法
    • US20080311627A1
    • 2008-12-18
    • US11663420
    • 2005-06-17
    • Reimo TetznerKurt BerlinJuergen Distler
    • Reimo TetznerKurt BerlinJuergen Distler
    • C12P19/34
    • C12Q1/6848C12Q2527/101C12Q2521/301
    • Particular aspects provide methods for the specific amplification of template DNA in the presence of potentially contaminating PCR products from previous amplification experiments, but wherein the contaminating prior reaction amplificates (carry-over contaminants) are rendered non-amplifiable, based on use of particular contaminant degradation enzymes, and use of at least one primer that is fully complementary to any contaminating prior reaction amplificate nucleic acid, but contains a mismatch with the correspond sequence of the sample template nucleic acid. Additional aspects provide a method for the specific amplification of single-stranded sample template DNA in the presence of potentially double-stranded carry-over products. Further aspects provide methods comprising use of a template-dependent thermostable DNA polymerase enzyme suitable for incorporating ribonucleotides as well as deoxy-nucleotides to provide a chimeric amplificate. After digestion with an RNase, any contaminating prior chimeric amplificate, the RNase is inactivated. These aspects are surprisingly effective alternatives to the carry over protection system known as UNG system, and other art-recognized methods.
    • 特定方面提供了在来自先前扩增实验的潜在污染性PCR产物存在下对模板DNA进行特异性扩增的方法,但其中基于使用特定污染物降解使污染的先前反应扩增(携带污染物)变得不可扩增 酶,以及使用与任何污染的先前反应扩增核酸完全互补的至少一个引物,但是含有与样品模板核酸的相应序列错配。 另外的方面提供了在存在潜在双链携带产物的情况下单链样品模板DNA的特异性扩增的方法。 另外的方面提供了包括使用适合于掺入核糖核苷酸的模板依赖性热稳定性DNA聚合酶以及脱氧核苷酸以提供嵌合扩增的方法。 用RNase消化后,任何污染的先前的嵌合扩增,核糖核酸酶被灭活。 这些方面对于被称为UNG系统的承载保护系统以及其他本领域公认的方法是惊人的有效的替代方案。