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    • 31. 发明授权
    • Method for introducing unidirectional nested deletions
    • 引入单向嵌套缺失的方法
    • US5928908A
    • 1999-07-27
    • US966958
    • 1997-11-10
    • John J. DunnMark A. QuesadaMatthew Randesi
    • John J. DunnMark A. QuesadaMatthew Randesi
    • C12N15/10C12N15/64
    • C12N15/102
    • Disclosed is a method for the introduction of unidirectional deletions in a cloned DNA segment. More specifically, the method comprises providing a recombinant DNA construct comprising a DNA segment of interest inserted in a cloning vector, the cloning vector having an f1 endonuclease recognition sequence adjacent to the insertion site of the DNA segment of interest. The recombinant DNA construct is then contacted with the protein pII encoded by gene II of phage f1 thereby generating a single-stranded nick. The nicked DNA is then contacted with E. coli Exonuclease III thereby expanding the single-stranded nick into a single-stranded gap. The single-stranded gapped DNA is then contacted with a single-strand-specific endonuclease thereby producing a linearized DNA molecule containing a double-stranded deletion corresponding in size to the single-stranded gap. The DNA treated in this manner is then incubated with DNA ligase under conditions appropriate for ligation. Also disclosed is a method for producing single-stranded DNA probes. In this embodiment, single-stranded gapped DNA, produced as described above, is contacted with a DNA polymerase in the presence of labeled nucleotides to fill in the gap. This DNA is then linearized by digestion with a restriction enzyme which cuts outside the DNA segment of interest. The product of this digestion is then denatured to produce a labeled single-stranded nucleic acid probe.
    • 公开了在克隆的DNA片段中引入单向缺失的方法。 更具体地,该方法包括提供包含插入克隆载体中的目标DNA片段的重组DNA构建体,该克隆载体具有与感兴趣的DNA片段的插入位点相邻的f1内切核酸酶识别序列。 然后将重组DNA构建体与由噬菌体f1的基因II编码的蛋白质pII接触,从而产生单链切口。 然后将切口的DNA与大肠杆菌外切核酸酶III接触,从而将单链缺口扩大为单链间隙。 然后将单链间隙DNA与单链特异性内切核酸酶接触,从而产生含有与单链间隙大小相对应的双链缺失的线性化DNA分子。 然后以适合于连接的条件,用这种方式处理的DNA与DNA连接酶一起温育。 还公开了用于生产单链DNA探针的方法。 在该实施方案中,如上所述制备的单链间隙DNA在DNA标记的核苷酸的存在下与DNA聚合酶接触以填充间隙。 然后通过用限制性内切酶消化DNA直接切割该DNA,该限制性内切酶在感兴趣的DNA片段之外。 然后将该消化产物变性以产生标记的单链核酸探针。
    • 36. 发明申请
    • Single-Point Genome Signature Tags
    • 单点基因组签名标签
    • US20090011511A1
    • 2009-01-08
    • US11925382
    • 2007-10-26
    • John J. DunnDaniel van der LelieMaureen K. KrauseSean R. McCorkle
    • John J. DunnDaniel van der LelieMaureen K. KrauseSean R. McCorkle
    • C12Q1/68
    • C12Q1/6809C12Q1/6827C12Q2525/191C12Q2525/131C12Q2521/313C12Q2537/159C12Q2537/164C12Q2563/131
    • Disclosed is a method for analyzing the organismic complexity of a sample through analysis of the nucleic acid in the sample. In the disclosed method, through a series of steps, including digestion with a type II restriction enzyme, ligation of capture adapters and linkers and digestion with a type IIS restriction enzyme, genome signature tags are produced. The sequences of a statistically significant number of the signature tags are determined and the sequences are used to identify and quantify the organisms in the sample. Various embodiments of the invention described herein include methods for using single point genome signature tags to analyze the related families present in a sample, methods for analyzing sequences associated with hyper- and hypo-methylated CpG islands, methods for visualizing organismic complexity change in a sampling location over time and methods for generating the genome signature tag profile of a sample of fragmented DNA.
    • 公开了通过分析样品中的核酸来分析样品的生物复杂性的方法。 在所公开的方法中,通过一系列步骤,包括用II型限制酶消化,连接捕获适配器和接头并用IIS限制酶消化,产生基因组签名标签。 确定统计学上显着数量的签名标签的序列,并且使用该序列来鉴定和量化样品中的生物体。 本文描述的本发明的各种实施方案包括使用单点基因组签名标签分析样品中存在的相关家族的方法,用于分析与超低甲基化和次甲基化CpG岛相关的序列的方法,用于可视化取样中的有机体复杂性变化的方法 随着时间推移的位置以及用于产生片段化DNA样品的基因组特征标签谱的方法。