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    • 2. 发明公开
    • Regulated vectors for controlling DNA hypermutability in eukaryotic cells
    • 用于控制真核细胞中DNA超可变性的调控载体
    • EP2110440A2
    • 2009-10-21
    • EP09155285.1
    • 2003-02-21
    • Morphotek, Inc.
    • Grasso, LuigiNicholaides, Nicholas CSass, Philip M
    • C12Q1/68C12N15/85
    • C12N15/1024C12N15/85C12N2830/42C12N2840/203
    • 1. The present invention provides a method for producing an isolated, genetically stable somatic cell line with a new phenotype, the method comprising the steps of:
      a) culturing a recombinant host somatic cell comprising a vector, said vector comprising a constitutively active promoter operatively linked to a sequence encoding a dominant negative allele of a mismatch repair gene, an internal ribosome entry site, and a negative selection marker, under conditions for the expression of the dominant negative allele, rendering the recombinant host somatic cell hypermutable and thereby producing a library of cells;
      b) selecting for clones from the cell library exhibiting new phenotypes;
      c) from the clones selected in step (b), negatively selecting for clones no longer expressing the dominant negative allele of a mismatch repair gene, rendering the resulting subclones genetically stable; and
      d) expanding a genetically stable subclone of step (c) to generate said genetically stable cell line.
    • 1.本发明提供了产生具有新表型的分离的,遗传稳定的体细胞系的方法,所述方法包括以下步骤:a)培养包含载体的重组宿主体细胞,所述载体在操作上包含组成型活性启动子 在显性失活等位基因表达的条件下,与编码错配修复基因的显性失活等位基因,内部核糖体进入位点和阴性选择标记的序列相连,使重组宿主体细胞超可变,从而产生文库 细胞; b)从展示新表型的细胞文库中选择克隆; c)从步骤(b)中选择的克隆中,阴性选择不再表达错配修复基因的显性失活等位基因的克隆,使得到的亚克隆遗传稳定; 和d)扩增步骤(c)的遗传稳定的亚克隆以产生所述遗传稳定的细胞系。